ABSTRACT:A parametric macro model for a single and dual conductor power cable for transient thermo-electrical coupled simulation in PSPICE will be derived. The articledepicts the modelling of a simplified, single- and dual conductor cable and its use during simulation. Its verification against experiment and finite element simulation shows a good agreement. The derived single- and dual conductor PSPICE cable macro model enables a quick modelling at system level. It offers a time saving transient thermo-electrical simulation under various thermal conditions and cable geometries and to optimize e.g. size, weight. The approach support the engineer to overlook the thermal influences and temperatures along the power cable under real ‘thermal’ assembling conditions in an e.g. car engine room or aircraft.
An Adaptive Soft Calibration Technique for Thermocouples using Optimized ANNidescitation
Design of an adaptive soft calibration technique
for temperature measurement using Thermocouple by an
optimized Artificial Neural Network (ANN) is reported in this
paper. The objectives of the present work are: (i) to extend the
linearity range of measurement to 100% of full scale input
range, (ii) to make the measurement technique adaptive to
variations in temperature coefficients, and (iii) to achieve
objectives (i) and (ii) using an optimized neural network.
Optimized neural network model is designed with various
algorithms, and transfer functions of neuron considering a
particular scheme. The output of Thermocouple is of the order
of milli volts. It is converted to voltage by using a suitable data
conversion unit. A suitable optimized ANN is added in place of
conventional calibration circuit. ANN is trained, tested with
simulated data considering variations in temperature
coefficients. Results show that the proposed technique has
fulfilled the objectives.
Eternal Sun Group - Bifacial measurements, towards a new norm!Marcello Passaro
ITRPV and customers feedback show that there is a shift towards bifacial modules, however a concern on how to correctly test bifacial modules. Eternal Sun Group has together with research and development institutes like ECN looked at the complications and implications hereof.
Characterization and modeling the effect of temperature on power HBTs InGaP/G...IJECEIAES
The variation and stability of HBT’s parameters at different temperatures are important for utilizing these devices in high-power integrated circuits. The temperature dependence of the DC current gain of bipolar transistors, as a key device parameter, has been extensively investigated. A major issue of the power HBT’s is that the current gain is decreased with junction temperature due to self-heating effect.Hence, how to stabilize the DC current gain and RF performances is important issue to develop the power HBTs. This work describes the DC and high-frequency temperature dependence of InGaP/GaAs HBT’s. The substrate temperature (T) was varied from 25 to 150°C. The static and dynamic performances of the HBT are degraded at high temperature, due to the reduced of carrier mobility with increasing temperature. The current gain (β) decreases at high temperatures; from 140 to 127 at 25 to 150°C, while the decreases in the peak F t and F max are observed from about 110 GHz to 68 GHz and from 165 GHz to 53 GHz respectively in the temperature range of 25 to 150°C.
Transient Numerical Analysis of Induction Heating of Graphite Cruciable at Di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry.
Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is
useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
Transient numerical analysis of induction heating of graphite cruciable at di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry. Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
Transient Numerical Analysis of Induction Heating of Graphite Cruciable at Di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry.
Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is
useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
An Adaptive Soft Calibration Technique for Thermocouples using Optimized ANNidescitation
Design of an adaptive soft calibration technique
for temperature measurement using Thermocouple by an
optimized Artificial Neural Network (ANN) is reported in this
paper. The objectives of the present work are: (i) to extend the
linearity range of measurement to 100% of full scale input
range, (ii) to make the measurement technique adaptive to
variations in temperature coefficients, and (iii) to achieve
objectives (i) and (ii) using an optimized neural network.
Optimized neural network model is designed with various
algorithms, and transfer functions of neuron considering a
particular scheme. The output of Thermocouple is of the order
of milli volts. It is converted to voltage by using a suitable data
conversion unit. A suitable optimized ANN is added in place of
conventional calibration circuit. ANN is trained, tested with
simulated data considering variations in temperature
coefficients. Results show that the proposed technique has
fulfilled the objectives.
Eternal Sun Group - Bifacial measurements, towards a new norm!Marcello Passaro
ITRPV and customers feedback show that there is a shift towards bifacial modules, however a concern on how to correctly test bifacial modules. Eternal Sun Group has together with research and development institutes like ECN looked at the complications and implications hereof.
Characterization and modeling the effect of temperature on power HBTs InGaP/G...IJECEIAES
The variation and stability of HBT’s parameters at different temperatures are important for utilizing these devices in high-power integrated circuits. The temperature dependence of the DC current gain of bipolar transistors, as a key device parameter, has been extensively investigated. A major issue of the power HBT’s is that the current gain is decreased with junction temperature due to self-heating effect.Hence, how to stabilize the DC current gain and RF performances is important issue to develop the power HBTs. This work describes the DC and high-frequency temperature dependence of InGaP/GaAs HBT’s. The substrate temperature (T) was varied from 25 to 150°C. The static and dynamic performances of the HBT are degraded at high temperature, due to the reduced of carrier mobility with increasing temperature. The current gain (β) decreases at high temperatures; from 140 to 127 at 25 to 150°C, while the decreases in the peak F t and F max are observed from about 110 GHz to 68 GHz and from 165 GHz to 53 GHz respectively in the temperature range of 25 to 150°C.
Transient Numerical Analysis of Induction Heating of Graphite Cruciable at Di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry.
Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is
useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
Transient numerical analysis of induction heating of graphite cruciable at di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry. Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
Transient Numerical Analysis of Induction Heating of Graphite Cruciable at Di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry.
Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is
useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
Design of a Sample and Hold Circuit using Rail to Rail Low Voltage Compact Op...IJERA Editor
This paper presents a low power high performance and higher sampling speed sample and hold circuit. The
proposed circuit is designed at 180 nm technology and has high linearity. The circuit can be used for the ADC
frontend applications and supports double sampling architecture. The proposed sample and hold circuit has
common mode range beyond rail to rail and uses two differential pairs transistor stages connected in parallel as
its input stage.
Determination of transient thermal characteristics for thermal electric behav...journalBEEI
In the current study, it was tried to describe a method for determining thermal characteristics of integrated micro-circuits to identify thermal parameters of multidisciplinary (thermal-electric) behavioral models. The problem is solved on the example of high-frequency pulse voltage converters. A solution was proposed to refine the minimum structure of the thermoelectric model based on an iterative least squares method using the Levenberg-Marquardt algorithm, as well as a graph of the spectral den-sity of time constants. This made it possible to reduce the influence of the filtering factor in the deconvolution operation when building a thermal model using the structural function of the thermal characteristic transition. Also, the results obtained can be used to build integrated circuits (IC) behavioral models, taking into account the thermal processes occurring in them.
This paper propose a new approach to determine a linear mathematical model of a PV moduel based on an accurate nonlinear model . In this study, electrical parameters at only one operating condition are calculated based on an accurate model. Then, first-order Taylor series approximations apply on the nonlinear model to estimate the proposed model at any operating conditionts. The proposed method determines the number of iteration times. This decreases calculation time and the speed of numerical convergence will be increased. And, it is observed that owing to this method, the system converged and the problem of failing to solve the system because of inappropriate initial values is eliminated. The proposed model is requested in order to allow photovoltaic plants simulations using low-cost computer platforms. The effectiveness of the proposed model is demonstrated for different temperature and irradiance values through conducting a comparison between result of the proposed model and experimental results obtained from the module data-sheet information.
Model to Evaluate the Performance of Building Integrated Photovoltaic Systems...IJECEIAES
This article describes a mathematical model implemented in Matlab/Simulink to evaluate the performance of building integrated photovoltaic systems (BIPVS). The proposed methodology allows to model independently the solar panel, the photovoltaic (pv) generator, inverter and the grid to integrate them into a single model in Simulink in order to evaluate the performance of the complete system. The validation of the model was made on a BIPV system of 6 kWp installed in a building at the Universidad de Bogotá Jorge Tadeo Lozano in Bogota, Colombia. The results indicate that there is a correlation greater than 0.9 between DC and AC power generated by the BIPV system and calculated by the model proposed for any weather condition.
PHYSICAL MODELING AND SIMULATION OF THERMAL HEATING IN VERTICAL INTEGRATED ...ijcses
Interconnect is one of the main performance determinant of modern integrated circuits (ICs). The new
technology of vertical ICs places circuit blocks in the vertical dimension in addition to the conventional
horizontal plane. Compared to the planar ICs, vertical ICs have shorter latencies as well as lower power
consumption due to shorter wires. This also increases speed, improves performances and adds to ICs
density. The benefits of vertical ICs increase as we stack more dies, due to successive reductions in wire
lengths. However, as we stack more dies, the lattice self-heating becomes a challenging and critical issue
due to the difficulty in cooling down the layers away from the heat sink. In this paper, we provide a
quantitative electro-thermal analysis of the temperature rise due to stacking. Mathematical models based
on steady state non-isothermal drift-diffusion transport equations coupled to heat flow equation are used.
These physically based models and the different heat sources in semiconductor devices will be presented
and discussed. Three dimensional numerical results did show that, compared to the planar ICs, the
vertical ICs with 2-die technology increase the maximum temperature by 17 Kelvin in the die away from
the heat sink. These numerical results will also be presented and analyzed for a typical 2-die structure of
complementary metal oxide semiconductor (CMOS) transistors.
KICKBACK NOISE ANALYSIS OF LOW POWER COMPARATORijsrd.com
The need for ultra low-power, area efficient, and high speed analog-to-digital converters is pushing toward the use of dynamic regenerative comparators to maximize speed and power efficiency. In this report, an analysis on the delay of the dynamic comparators will be presented. Based on the presented analysis, a new dynamic comparator is proposed, where the circuit of a conventional doubletail comparator is modified for low-power and fast operation even in small supply voltages. Comparators presented in this paper designed with 180nm technology file. The power consumption and delay has been modified with tradeoff in area.
Effect of mesh grid structure in reducing hot carrier effect of nmos device s...ijcsa
This paper presents the critical effect of mesh grid that should be considered during process and device
simulation using modern TCAD tools in order to develop and optimize their accurate electrical
characteristics. Here, the computational modelling process of developing the NMOS device structure is
performed in Athena and Atlas. The effect of Mesh grid on net doping profile, n++, and LDD sheet
resistance that could link to unwanted “Hot Carrier Effect” were investigated by varying the device grid
resolution in both directions. It is found that y-grid give more profound effect in the doping concentration,
the junction depth formation and the value of threshold voltage during simulation. Optimized mesh grid is
obtained and tested for more accurate and faster simulation. Process parameter (such as oxide thicknesses
and Sheet resistance) as well as Device Parameter (such as linear gain “beta” and SPICE level 3 mobility
roll-off parameter “ Theta”) are extracted and investigated for further different applications.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
The main factors affecting on value of maximum power point photovoltaic model...Ali Mahmood
A Matlab-Simulink based simulation study of photovoltaic (PV) cells
is carried out and presented in this paper. The study is helpful in results showed that
Maximum Power Point (MPP) strongly depends on sun irradiance, shunt resistance,
series resistance, temperature and ideal factor. These results might be used as a
guide for PV system users.
Structural, Electronic and Gamma Shielding Properties of BxAl1-xAsIJMERJOURNAL
ABSTRACT: The structural and electronic properties of BxAl1-xAs ternary alloys in the zincblende structure were systematically investigated by using the first principles calculations. The local density approximation was used for exchanged and correlation interaction. The calculated band gap bowing parameter was discovered to be mightily composition dependent of the Boron concentration. Additionally, we have calculated some gamma shielding parameters of BxAl1-xAs ternary alloys. Primarily, the values of mass attenuation coefficients (μρ) were calculated using WinXCom computer program and then these parameters were utilized to calculate the values of electron density (Nel) and effective atomic number (Zeff) in the wide energy range (1 keV - 100 GeV).
Investigation of Interleaved Boost Converter with Voltage multiplier for PV w...ecij
This paper depicts the significance of Interleaved Boost Converter (IBC) with diode-capacitor multiplierwith PV as the input source. Maximum Power Point Tracking (MPPT) was used to obtain maximum power from the PV system. In this, interleaving topology is used to reduce the input current ripple, output voltage ripple, power loss and to suppress the ripple in battery current in the case of Plugin Hybrid Electric Vehicle (PHEV). Moreover, voltage multiplier cells are added in the IBC configuration to reduce the narrow turn-off periods. Two MPPT techniques are compared in this paper: i) Perturb and Observe (P&O) algorithm ii) Fuzzy Logic . The two algorithms are simulated using MATLAB and the comparison of performance parameters like the ripple is done and the results are verified.
COMPREHENSIVE ANALYSIS AND SIMULATION OF MULTILEVEL POWER CONVERTERS TO CURTA...ecij
Present day industrial applications require higher power apparatus for power conversion. At medium
voltage grid, to connect only one power semiconductor switch directly is a not practically successful
concept. To overcome this multilevel power converter structure has been introduced and studied as an
alternative in high power and medium voltage applications. Renewable energy sources like photovoltaic,
wind, fuel cells can be conveniently interfaced to a multilevel converter system for high power applications.
In this study it is discussed in detail for different levels of the multilevel converters using pulse width
modulation technique (PWM) the harmonics contents decreases gradually. The simulated results are
presented and compared thereafter. Total harmonic distortion decreases as the number of levels increased
are tabulated accordingly. All the simulation results are carried out under MATLAB/Simulink environment.
New Mexico State University 1
New Mexico State University
Mechanical & Aerospace Engineering Department
Experimental Methods II
ME 445
LAB Exercise-4
TIME FOR BRIDGEWIRE BREAK
4.1 Objective
To apply the principles of heat transfer to estimate the break time of a resistive wire through
which a constant electric current is flowing.
Through this experiment, students will theoretically estimate the time using energy
balance equations.
Apply linear regression to fit manufacturer’s data with the model to deduce unknown
heat transfer parameters.
Predictions will be verified or contradicted by experimental measurement.
4.2 Theoretical Background
The physical representation of the problem is shown in the following figure:
Figure 4.0.1: Physical representation of the wire
A wire of length L and diameter D is considered. Due to the passage of electric current through
the wire, heat is generated internally. If radiation and convective heat loss are presumed as the
principal heat loss mechanisms, the energy balance for this problem, based on lumped mass for
the wire and infinite length, can be written:
Rate of change of Internal Energy (Qstored)
= Rate of Internal Energy Generation (Qgenerated) – Rate of Heat Loss (Qloss)
In the above equation, note that the heat input is not considered since no heat is being supplied
to the wire from its boundaries.
Symbolically, we can write the energy equation as:
TThATTAi
dt
dT
mc
wireswires
442
(4.1)
New Mexico State University 2
where,
m = mass of the wire = density of the wire * volume of the wire = ρV
Twire = Surface temperature of the wire
i = Current
R = Resistance of the wire
σ = Stefan-Boltzmann constant = 5.67 X 10
8
W/m
-2
K
-4
c = Specific heat capacity of the wire material
ε = Emissivity of the wire
As = Surface area of the wire
For present purposes the assumption is made that convection around the horizontal wire is fully
developed. The quantities m, c, I, , σ, As and Ts are presumed known. However, uncertainty
exists in the emissivity of the wire because of oxidized state is not precisely known, and the
convection coefficient is known to vary somewhat with size, and mean temperature across the
thermal boundary layer.
For the case of the wire which is to be used in this experiment, the manufacturer has provided
temperature versus current data for steady state. Hence, by using a multi-variable linear
regression, it is possible to use this data along with the steady state energy equation, to obtain
estimates for h and ε. However, when such an approach is taken, it is found that the value of ε
exceeds unity, an impossible condition. In order to resolv.
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Design of a Sample and Hold Circuit using Rail to Rail Low Voltage Compact Op...IJERA Editor
This paper presents a low power high performance and higher sampling speed sample and hold circuit. The
proposed circuit is designed at 180 nm technology and has high linearity. The circuit can be used for the ADC
frontend applications and supports double sampling architecture. The proposed sample and hold circuit has
common mode range beyond rail to rail and uses two differential pairs transistor stages connected in parallel as
its input stage.
Determination of transient thermal characteristics for thermal electric behav...journalBEEI
In the current study, it was tried to describe a method for determining thermal characteristics of integrated micro-circuits to identify thermal parameters of multidisciplinary (thermal-electric) behavioral models. The problem is solved on the example of high-frequency pulse voltage converters. A solution was proposed to refine the minimum structure of the thermoelectric model based on an iterative least squares method using the Levenberg-Marquardt algorithm, as well as a graph of the spectral den-sity of time constants. This made it possible to reduce the influence of the filtering factor in the deconvolution operation when building a thermal model using the structural function of the thermal characteristic transition. Also, the results obtained can be used to build integrated circuits (IC) behavioral models, taking into account the thermal processes occurring in them.
This paper propose a new approach to determine a linear mathematical model of a PV moduel based on an accurate nonlinear model . In this study, electrical parameters at only one operating condition are calculated based on an accurate model. Then, first-order Taylor series approximations apply on the nonlinear model to estimate the proposed model at any operating conditionts. The proposed method determines the number of iteration times. This decreases calculation time and the speed of numerical convergence will be increased. And, it is observed that owing to this method, the system converged and the problem of failing to solve the system because of inappropriate initial values is eliminated. The proposed model is requested in order to allow photovoltaic plants simulations using low-cost computer platforms. The effectiveness of the proposed model is demonstrated for different temperature and irradiance values through conducting a comparison between result of the proposed model and experimental results obtained from the module data-sheet information.
Model to Evaluate the Performance of Building Integrated Photovoltaic Systems...IJECEIAES
This article describes a mathematical model implemented in Matlab/Simulink to evaluate the performance of building integrated photovoltaic systems (BIPVS). The proposed methodology allows to model independently the solar panel, the photovoltaic (pv) generator, inverter and the grid to integrate them into a single model in Simulink in order to evaluate the performance of the complete system. The validation of the model was made on a BIPV system of 6 kWp installed in a building at the Universidad de Bogotá Jorge Tadeo Lozano in Bogota, Colombia. The results indicate that there is a correlation greater than 0.9 between DC and AC power generated by the BIPV system and calculated by the model proposed for any weather condition.
PHYSICAL MODELING AND SIMULATION OF THERMAL HEATING IN VERTICAL INTEGRATED ...ijcses
Interconnect is one of the main performance determinant of modern integrated circuits (ICs). The new
technology of vertical ICs places circuit blocks in the vertical dimension in addition to the conventional
horizontal plane. Compared to the planar ICs, vertical ICs have shorter latencies as well as lower power
consumption due to shorter wires. This also increases speed, improves performances and adds to ICs
density. The benefits of vertical ICs increase as we stack more dies, due to successive reductions in wire
lengths. However, as we stack more dies, the lattice self-heating becomes a challenging and critical issue
due to the difficulty in cooling down the layers away from the heat sink. In this paper, we provide a
quantitative electro-thermal analysis of the temperature rise due to stacking. Mathematical models based
on steady state non-isothermal drift-diffusion transport equations coupled to heat flow equation are used.
These physically based models and the different heat sources in semiconductor devices will be presented
and discussed. Three dimensional numerical results did show that, compared to the planar ICs, the
vertical ICs with 2-die technology increase the maximum temperature by 17 Kelvin in the die away from
the heat sink. These numerical results will also be presented and analyzed for a typical 2-die structure of
complementary metal oxide semiconductor (CMOS) transistors.
KICKBACK NOISE ANALYSIS OF LOW POWER COMPARATORijsrd.com
The need for ultra low-power, area efficient, and high speed analog-to-digital converters is pushing toward the use of dynamic regenerative comparators to maximize speed and power efficiency. In this report, an analysis on the delay of the dynamic comparators will be presented. Based on the presented analysis, a new dynamic comparator is proposed, where the circuit of a conventional doubletail comparator is modified for low-power and fast operation even in small supply voltages. Comparators presented in this paper designed with 180nm technology file. The power consumption and delay has been modified with tradeoff in area.
Effect of mesh grid structure in reducing hot carrier effect of nmos device s...ijcsa
This paper presents the critical effect of mesh grid that should be considered during process and device
simulation using modern TCAD tools in order to develop and optimize their accurate electrical
characteristics. Here, the computational modelling process of developing the NMOS device structure is
performed in Athena and Atlas. The effect of Mesh grid on net doping profile, n++, and LDD sheet
resistance that could link to unwanted “Hot Carrier Effect” were investigated by varying the device grid
resolution in both directions. It is found that y-grid give more profound effect in the doping concentration,
the junction depth formation and the value of threshold voltage during simulation. Optimized mesh grid is
obtained and tested for more accurate and faster simulation. Process parameter (such as oxide thicknesses
and Sheet resistance) as well as Device Parameter (such as linear gain “beta” and SPICE level 3 mobility
roll-off parameter “ Theta”) are extracted and investigated for further different applications.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
The main factors affecting on value of maximum power point photovoltaic model...Ali Mahmood
A Matlab-Simulink based simulation study of photovoltaic (PV) cells
is carried out and presented in this paper. The study is helpful in results showed that
Maximum Power Point (MPP) strongly depends on sun irradiance, shunt resistance,
series resistance, temperature and ideal factor. These results might be used as a
guide for PV system users.
Structural, Electronic and Gamma Shielding Properties of BxAl1-xAsIJMERJOURNAL
ABSTRACT: The structural and electronic properties of BxAl1-xAs ternary alloys in the zincblende structure were systematically investigated by using the first principles calculations. The local density approximation was used for exchanged and correlation interaction. The calculated band gap bowing parameter was discovered to be mightily composition dependent of the Boron concentration. Additionally, we have calculated some gamma shielding parameters of BxAl1-xAs ternary alloys. Primarily, the values of mass attenuation coefficients (μρ) were calculated using WinXCom computer program and then these parameters were utilized to calculate the values of electron density (Nel) and effective atomic number (Zeff) in the wide energy range (1 keV - 100 GeV).
Investigation of Interleaved Boost Converter with Voltage multiplier for PV w...ecij
This paper depicts the significance of Interleaved Boost Converter (IBC) with diode-capacitor multiplierwith PV as the input source. Maximum Power Point Tracking (MPPT) was used to obtain maximum power from the PV system. In this, interleaving topology is used to reduce the input current ripple, output voltage ripple, power loss and to suppress the ripple in battery current in the case of Plugin Hybrid Electric Vehicle (PHEV). Moreover, voltage multiplier cells are added in the IBC configuration to reduce the narrow turn-off periods. Two MPPT techniques are compared in this paper: i) Perturb and Observe (P&O) algorithm ii) Fuzzy Logic . The two algorithms are simulated using MATLAB and the comparison of performance parameters like the ripple is done and the results are verified.
COMPREHENSIVE ANALYSIS AND SIMULATION OF MULTILEVEL POWER CONVERTERS TO CURTA...ecij
Present day industrial applications require higher power apparatus for power conversion. At medium
voltage grid, to connect only one power semiconductor switch directly is a not practically successful
concept. To overcome this multilevel power converter structure has been introduced and studied as an
alternative in high power and medium voltage applications. Renewable energy sources like photovoltaic,
wind, fuel cells can be conveniently interfaced to a multilevel converter system for high power applications.
In this study it is discussed in detail for different levels of the multilevel converters using pulse width
modulation technique (PWM) the harmonics contents decreases gradually. The simulated results are
presented and compared thereafter. Total harmonic distortion decreases as the number of levels increased
are tabulated accordingly. All the simulation results are carried out under MATLAB/Simulink environment.
New Mexico State University 1
New Mexico State University
Mechanical & Aerospace Engineering Department
Experimental Methods II
ME 445
LAB Exercise-4
TIME FOR BRIDGEWIRE BREAK
4.1 Objective
To apply the principles of heat transfer to estimate the break time of a resistive wire through
which a constant electric current is flowing.
Through this experiment, students will theoretically estimate the time using energy
balance equations.
Apply linear regression to fit manufacturer’s data with the model to deduce unknown
heat transfer parameters.
Predictions will be verified or contradicted by experimental measurement.
4.2 Theoretical Background
The physical representation of the problem is shown in the following figure:
Figure 4.0.1: Physical representation of the wire
A wire of length L and diameter D is considered. Due to the passage of electric current through
the wire, heat is generated internally. If radiation and convective heat loss are presumed as the
principal heat loss mechanisms, the energy balance for this problem, based on lumped mass for
the wire and infinite length, can be written:
Rate of change of Internal Energy (Qstored)
= Rate of Internal Energy Generation (Qgenerated) – Rate of Heat Loss (Qloss)
In the above equation, note that the heat input is not considered since no heat is being supplied
to the wire from its boundaries.
Symbolically, we can write the energy equation as:
TThATTAi
dt
dT
mc
wireswires
442
(4.1)
New Mexico State University 2
where,
m = mass of the wire = density of the wire * volume of the wire = ρV
Twire = Surface temperature of the wire
i = Current
R = Resistance of the wire
σ = Stefan-Boltzmann constant = 5.67 X 10
8
W/m
-2
K
-4
c = Specific heat capacity of the wire material
ε = Emissivity of the wire
As = Surface area of the wire
For present purposes the assumption is made that convection around the horizontal wire is fully
developed. The quantities m, c, I, , σ, As and Ts are presumed known. However, uncertainty
exists in the emissivity of the wire because of oxidized state is not precisely known, and the
convection coefficient is known to vary somewhat with size, and mean temperature across the
thermal boundary layer.
For the case of the wire which is to be used in this experiment, the manufacturer has provided
temperature versus current data for steady state. Hence, by using a multi-variable linear
regression, it is possible to use this data along with the steady state energy equation, to obtain
estimates for h and ε. However, when such an approach is taken, it is found that the value of ε
exceeds unity, an impossible condition. In order to resolv.
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The use of ekf to estimate the transient thermal behaviour of induction motor...Mellah Hacene
In this paper, a survey is conducted to examine the problem of estimating the states and parameters of an asynchronous machine when some of these measures are not available or the estimation approach is the best solution. The modeling is based on the theory of power dissipation; heat transfer and the rate of temperature increase the stator and the rotor, taking into account the effect of speed on trade. The first purpose of this article is displayed the effect of variable losses depending on the load and constant losses on the thermal behavior of asynchronous motor. According to the sensor’s problems and the obtaining of the thermal information about the rotor, the second goal is the use of a sensorless method like the use of the EKF (extended Kalman filter), some simulation results are given and commented.
One-dimensional Lumped-Circuit for Transient Thermal Study of an Induction El...IJECEIAES
Electrical machines lifetime and performances could be improved when along the design process both electromagnetic and thermal behaviors are taken into account. Moreover, real time information about the device thermal state is necessary to an appropriate control with minimized losses. Models based on lumped parameter thermal circuits are: generic, rapid, accurate and qualified as a convenient solution for power systems. The purpose of the present paper is to validate a simulation platform intended for the prediction of the thermal state of an induction motor covering all operation regimes. To do so, in steady state, the proposed model is validated using finite element calculation and experimental records. Then, in an overload situation, obtained temperatures are compared to finite element’s ones. It has been found that, in both regimes, simulation results are with closed proximity to finite element’s ones and experimental records.
An Analytical Lumped Thermal Circuit for the Determination of Fast Warm up and Steady State Characteristics Of Heater/Cathode Packages for TWT’s.
The challenge of determining fast warm up rates in small heater/cathode packages is critical to many tube development programs, but suffused with difficulties. An over voltage is applied to the heater during the warm up time and current and hence power in the heater is determined by the resistance of
the wire at any point in time. The heater
wire usually consists of 97%
tungsten/3% rhenium alloy and this has
the property of resistivity variation with
temperature of over an order of
magnitude. This wire will also not be at
a uniform temperature at any time. In
addition, power is lost by a complex
combination of conductions and
radiation exchanges, with thermal
conductivities, expansivities,
emissivities, and specific heats for all
materials varying markedly with
temperature.
Accurate modeling of cables is important to study the behavior of high frequency disturbances in power converter systems. This paper reviews and compares two popular methodologies to model energy cables – an improved per unit length parameters based model and a Laplace SPICE element based model. The two models presented take into account the frequency dependence of the parameters of the cable. A ladder network is used for this purpose in the per unit length based model. The Laplace SPICE element model is generated from from a rational function approximation for the admittance parameters that are frequency dependant. The rational function approximation is obtained using a well known vector fitting algorithm. The time and frequency domain solutions of a two wire energy cable, obtained from the two models, agree well.
Cascade forward neural network based on resilient backpropagation for simulta...Mellah Hacene
Cascade-Forward Neural Network Based on Resilient Backpropagation for Simultaneous Parameters and State Space Estimations of Brushed DC Machines
Advances in Modelling and Analysis B
RESEARCH ON INDUCTION HEATING - A REVIEWEditor IJCATR
This paper presents results of finite element analysis of induction heating problems considering temperature dependence of
material characteristics. In this analysis, we have used the three-dimensional finite element method in order to correctly express
induction heating coil’s shapes and to make clear its effects on temperature distributions. The heat-conducting problem and the eddy
current problem are coupled, and solved by using the step-by-step calculations.
The Application of Artificial Intelligence Techniques for Modeling and Simula...MohammadMomani26
Abstract— This paper accurately models photovoltaic (PV) arrays based on genetic and Cuckoo Optimization algorithms. These algorithms are used to obtain the parameters of the array model based on a PV cell datasheet information. In this work, a comparison between the two-diode model and the single-diode model is presented. The adopted model is implemented on simulation platforms using MATLAB 2020a environment and it is designed to be of use to power electronics specialists. The mathematical analysis of the model is presented in detail where different cases of different temperature and solar irradiance are adopted. The model was tested and validated with experimental data. Validation and comparison data are taken from the Mutah university PV power plant. The results show that the two-diode model is more accurate than the single diode model, Cuckoo optimization algorithm handles the problem with low iterations and better fitness value as compared with the genetic algorithm. The work in paper is useful for power electronics designers and researchers who need an effective and more accurate way to model and simulate photovoltaic arrays.
Artificial neural network approach for more accurate solar cell electrical ci...ijcsa
The implementation of a neural network especially for improving the accuracy of the electrical equivalent
circuit parameters of a solar cell is proposed. These electrical parameters mainly depend on solar
irradiation and temperature, but their relationship is nonlinear and cannot be easily expressed by any
analytical equation. Therefore, the proposed neural network is trained once by using some measured
current–voltage curves, and the equivalent circuit parameters are estimated by only reading the samples of
solar irradiation and temperature very quickly. Taking the effect of sunlight irradiance and ambient
temperature into consideration, the output current and power characteristics of PV model are simulated
and optimized. Finally, the proposed model has been validated with datasheet and experimental data from
commercial PV module, Kotak PV-KM0060 (60Wp).The comparison show the higher accuracy of the ANN
model than the conventional one diode circuit model for all operating conditions.
We present this work by two steps. In the first one, the new structure proposed of the FP-HEMTs device (Field plate High Electron Mobility Transistor) with a T-gate on an 4H-SIC substrate to optimize these electrical performances, multiple field-plates were used with aluminum oxide to split the single electric field peak into several smaller peaks, and as passivation works to reduce scaling leakage current. In the next, we include a modeling of a simulation in the Tcad-Silvaco Software for realizing the study of the influence of negative voltage applied to gate T-shaped in OFF state time and high power with ambient temperature, the performance differences between the 3FP and the SFP devices are discussed in detail.
Similar to Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual Conductor Power Cable (20)
Predictive Data Mining with Normalized Adaptive Training Method for Neural Ne...IJERDJOURNAL
Abstract:- Predictive data mining is an upcoming and fast-growing field and offers a competitive edge for the benefit of organization. In recent decades, researchers have developed new techniques and intelligent algorithms for predictive data mining. In this research paper, we have proposed a novel training algorithm for optimizing neural networks for prediction purpose and to utilize it for the development of prediction models. Models developed in MATLAB Neural Network Toolbox have been tested for insurance datasets taken from a live data warehouse. A comparative study of the proposed algorithm with other popular first and second order algorithms has been presented to judge the predictive accuracy of the suggested technique. Various graphs have been presented to analyse the convergence behaviour of different algorithms towards point of minimum error.
The development of the Islamic Heritage in Southeast Asia tradition and futur...IJERDJOURNAL
ABSTRACT: This research explores the historical development of Islamic architecture in Southeast Asia from the first idea to design a mosque by the Prophet Mohammad until the development at these days with the various purism passages And as developed up these days with the passages of the development of the traditional type to the postmodern, finally to modern Southeast Asia. The Islamic architecture has been developed in six traditional typologies of types of mosques is renowned throughout the world. Southeast Asia mosques are divided into various types according to the regional culture as Arabic type, Turkish type, the Iranian type, the Indian type, the Chinese type and South East Asian type. This research describes the main characteristics of these types. The main purpose of this research is to draw a correlation between the descriptions of the mosques in Malaysia as presented in the traditional typology that contains in its features in main types, relations in common throughout the Islamic world, however, distinguishes itself with the architectural form according to the local tradition.
An Iot Based Smart Manifold Attendance SystemIJERDJOURNAL
ABSTRACT:- Attendance has been an age old procedure employed in different disciplines of educational institutions. While attendance systems have witnessed growth right from manual techniques to biometrics, plight of taking attendance is undeniable. In fingerprint based attendance monitoring, if fingers get roughed / scratched, it leads to misreading. Also for face recognition, students will have to make a queue and each one will have to wait until their face gets recognised. Our proposed system is employing “manifold attendance” that means employing passive attendance, where at a time, the attendance of multiple people can get captured. We have eliminated the need of queue system / paper-pen system of attendance, and just with a single click the attendance is not only captured, but monitored as well, that too without any human intervention. In the proposed system, creation of database and face detection is done by using the concepts of bounding box, whereas for face recognition we employ histogram equalization and matching technique.
A Novel Approach To Detect Trustworthy Nodes Using Audit Based Scheme For WSNIJERDJOURNAL
ABSTRACT: In multi-hop ad hoc networks there exists a problem of identifying and isolating misbehaving nodes which refuses to forward packets. Audit-based Misbehavior Detection (AMD) is a comprehensive system that effectively and efficiently isolates both continuous and selective packet droppers. The AMD system integrates reputation management, trustworthy route discovery, and identification of misbehaving nodes based on behavioral audits. Compared to previous methods, AMD evaluates node behavior on a per-packet basis, without employing energy-expensive overhearing techniques or intensive acknowledgment schemes. Moreover, AMD can detect selective dropping attacks even if end-to-end traffic is encrypted and can be applied to multichannel networks or networks consisting of nodes with directional antennas. This work implements the AMD approach by considering the rushing attack. The analysis of the results confirms that AMD based method with rushing attack performs better as compared to the non rushing attack.
Human Resource Competencies: An Empirical AssessmentIJERDJOURNAL
ABSTRACT: Human beings are the essential part of the process. Today, technology and machines are taking over the human resource, as claimed by many people; but technology and machines can never replace human resource entirely. Humans are required for operating and maintaining these machines. Human resource is extremely important for developing or bringing about new and required changes to these machines and technologies. The study of the history and the current Human Resource Management trends points out some important facts
Prospects and Problems of Non-Governmental Organizations in Poverty Alleviati...IJERDJOURNAL
ABSTRACT: The World Bank sponsored Millennium Development Goals (MDGs), launched in 1990 envisaged a world free of poverty by the year 2015. The North-East (where Gombe State is centrally located) is experiencing significantly higher poverty and lack of progress in poverty reduction efforts. With coming to end of 2015, much still need to be done to attain the MDGs. With over 62.6% Nigerian population still very poor, there is need for a continuous search for alternative planning & development options that would help ameliorate poverty and sustained our dream for a world free of poverty and wants. This study examines the prospects and investigates the constraints of Non-Governmental Organizations (NGOs) in poverty alleviation and community development. Literature review, questionnaire and interview methods were used for the study. The findings revealed that: finance, continuity of projects/programmes, conflicts and insecurity were the major problems confronting the NGOs. An interesting revelation is that majority of the respondents indicated that they wait for the NGOs or Government to initiate poverty alleviation programmes/projects. The implication is that the community dwellers need attitudinal change necessary for self reliance. The prospect of NGOs in poverty alleviation and community development in the study area is very bright due to rapid population growth & increasing poverty levels with the attendant positive effects on urban planning and regional development. The study recommends that NGOs should (1) form an association to enable them work together, and utilize social capital in their operation/services. (2) seek to explore avenues for funding from donor agencies. Finally, the Government needs to address some of its short comings.
Development of Regression Model Using Lasso And Optimisation of Process Param...IJERDJOURNAL
ABSTRACT:- Metal Spinning is a concept of describing the forming of metal into seamless, axisymmetric shapes by a combination of rotational motion and force. Sheet metal spinning is one of the metal forming processes, which a flat metal blank is rotated at a high speed and formed into an axisymmetric part by a roller which gradually forces the blank on to a mandrel, bearing the final shape of the spun part. Over the last few decades, sheet metal spinning has developed significantly and spun products have been used in various industries. Nowadays the process has been expanded to new horizons in industries, since tendency to use minimum tool and equipment costs and also using lower forces with the output of excellent surface quality and good mechanical properties. The automation of the process is of greater importance, due to its wider applications like decorative household‟s goods, rocket nose cones, gas cylinders etc. The objective of the current work is to develop the mathematical model for the spinning process with surface roughness as response and the input parameters as Mandrel speed (rpm), geometry of the Roller and Thickness of sheet (mm). Type of mandrel (EN8 Material) considered in the spinning process has the geometrical profile of parabola and single roller and double roller tools (EN8 Material) are used to deform the Al2024-T3 sheet metal paper aims to understand the process parameters that affect the surface finish of the spun component. Full factorial Design of Experiments technique is used to find the minimum number of experimental trials that are required to develop the regression model. A regression model using Least Absolute Shrinkage and Selection Operator (Lasso) is developed to further deepen the understanding between the input parameters and the surface roughness. The model was optimised using Sequential Quadratic Programming.
Use of Satellite Data for Feasibility Study And Preliminary Design Project Re...IJERDJOURNAL
ABSTRACT: In the developing countries like India, need of infrastructure is very high as compared to the available resources. The various organizations put their demands to state and center government for sanction of their project, government depends upon its various department to provide an approximate cost so that priorities can be assigned. The conventional procedure depends upon the land surveying, collection of data from various departments resulting in delay in necessary decision making or some time shelving due to unreasonable cost estimate due to field data being very old. Survey of India, The National Survey and Mapping Organization single handily taking this responsibility thus up gradation of data is far behind the actual development. From the satellite data, which is available in the form of images and terrains (even in 3d LiDAR points for some areas) is very useful for Feasibility Study, and Preliminary Project Report. In the present study natural drain named „Chai Nala‟ meanders through the prime property of Greater Mohali Area Development Authority (GMADA) thus making a big chunk of commercial land inoperative. It was proposed to straighten and channelize to reclaim the land from drain regime. Being the precious land department wanted the most economical and technically sound design without taking any risk. It was decided to counter check the hydraulic data, ground profile, acquired from the Punjab Irrigation Department with the satellite data and Differential Global Positioning System (DGPS). The data from the Google Earth was acquired using Cad Earth software and water shed analysis was carried out using Autodesk Civil 3D software. Comparison of results shows that this technique is quite useful and can be for preliminary feasibility and project preparation. Thus saving huge money and time.
Microwave Assisted Sol Gel Synthesis of Magnesium Oxide(Mgo)IJERDJOURNAL
ABSTRACT: Magnesium oxide (MgO) nanoparticles have been synthesized by Microwave assisted Sol gel synthesis method by using the precursors citric acid (C2O4H2) and magnesium chloride (Mgcl2.6H2O). It is a simple, novel and cost effective method. The structure, morphology and crystalline phase of the magnesium oxide nanocrystals have been investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD).Presence of functional groups and optical characters are analyzed by using FTIR and UV- visible techniques
Development of Enhanced Frequency Drive for 3-Phase Induction Motors Submitte...IJERDJOURNAL
ABSTRACT: Three-phase induction motors produce mechanical power by electromagnetic induction and run on a 3-phase ac supply. They require efficient speed control, to enable them do variable speed operations, save power consumption and reduce machine noise. In this dissertation, a new switching device called MosControlled Thyristor (MCT) for frequency drive is introduced. Based on the new switching device and AT89C52 microcontroller, an enhanced frequency drive for controlling the speed and torque of 3-phase 15kW squirrel cage induction motor is modeled. Different voltages ranging from 342V to 415V and frequencies ranging from 50Hz to 60Hz are used in a systematic manner to simulate the system based on the new switching device. The simulation program is written in C language and tested with Proteus 7.6 simulation software. Voltage and frequency have significant impact on the actual speed and torque of the motor. Simulation results show that with the new model, the torque (56.66Nm) developed by the motor which is constant throughout each speed range is directly proportional to the ratio (6.7:1) of the applied voltage and the frequency of the supply and the selected speeds (1450, 1510, 1570, 1630, 1690 and 1750 rpm) are locked irrespective of change in load. This is unlike other models where magnetic saturation and conduction drop of IGBT lead to voltage/frequency imbalance resulting in excessive drawing of current by the motor and overheating. This new control method has a speed regulation of ±2 to 3% of maximum frequency, speed response of 3Hz, speed control range of 1: 40 and efficiency of 88%, as further advantages. Comparison of the system with other speed control techniques shows improved energy-saving, cost effectiveness and safety in operation. The contributions of this research aim to make Volts per Hertz speed control method based on MCT a reliable better alternative to other well known methods in speed control of three-phase induction motors
Short-Term Load Forecasting Using ARIMA Model For Karnataka State Electrical ...IJERDJOURNAL
ABSTRACT: Short-term load forecasting is a key issue for reliable and economic operation of power systems. This paper aims to develop short-term electric load forecasting ARIMA Model for Karnataka Electrical Load pattern based on Stochastic Time Series Analysis. The logical and organised procedures for model development using Autocorrelation Function and Partial Autocorrelation Function make ARIMA Model particularly attractive. The methodology involves Initial Model Development Phase, Parameter Estimation Phase and Forecasting Phase. To confirm the effectiveness, the proposed model is developed and tested using the historical data of Karnataka Electrical Load pattern (2016). The forecasting error of ARIMA Model is computed and results have shown favourable forecasting accuracy.
Optimal Pricing Policy for a Manufacturing Inventory Model with Two Productio...IJERDJOURNAL
ABSTRACT: When a new product is launched, a manufacturer applies the strategy of offering a quantity incentive initially for some time to boost up the demand of the product. The present paper describes a manufacturing inventory model with price sensitive demand enhanced by a quantity incentive. Later on demand becomes time increasing also. Inventory cycle starts with low production rate which is followed by higher production rate when demand is boosted up. Shortages are not allowed in this model. Presentation of numerical examples, tables, graphs and sensitivity analysis describes the model very well. Lastly case without incentive illustrates that usually the quantity incentive offered initially is beneficial.
Analysis of failure behavior of shear connection in push-out specimen by thre...IJERDJOURNAL
ABSTRACT:- This study analyzes the failure mechanism of shear connection by three-dimensional finite element analysis (FEA) of push-out specimens that was practically unaffordable experimentally or by twodimensional FEA. For the analysis of the failure behavior of the compression strut formed in the loaded concrete member, the three-dimensional principal stress space is transformed into two-dimensional space by means of the relation between the hydrostatic stress and the deviatoric stress. The analysis of the stress state in the compression strut revealed that the deviatoric stress increases with larger load particularly in the concrete surrounding the lower part of the shear stud. Accordingly, bearing failure of concrete occurred locally within a limited region in the slab. The steep increase of the deviatoric stress accompanying the increase of the load resulted in the failure of concrete around the lower part of the shear stud, which in turn provoked the deformation and the development of bending moment of the shear stud. Finally, plastic hinge formed in the shear stud leading it to reach its limit state. The proposed finite element model can also be used to model the shear connection of the composite beam and, the proposed stress analysis method can be applied to analyze its composite action behavior.
Discrete Time Batch Arrival Queue with Multiple VacationsIJERDJOURNAL
ABSTRACT:- In this paper we consider a discrete time batch arrival queueing system with multiple vacations. It is assume that the service of customers arrived in the system between a fixed intervals of time after which the service goes on vacations after completion of one service of cycle is taken up at the boundaries of the fixed duration of time. This is the case of late arrival. In case of early arrival i.e. arrival before the start of next cycles of service. If the customer finds the system empty, it is served immediately. We prove the Stochastic decomposition property for queue length and waiting time distribution for both the models.
Regional Rainfall Frequency Analysis By L-Moments Approach For Madina Region,...IJERDJOURNAL
ABSTRACT:- In arid regions, extreme rainfall event frequency predictions are still a challenging problem, because of the rain gauge stations scarcity and the record length limitation, which are usually short to insure reliable quantile estimates. Regional frequency analysis is one of the popular approaches used to compensate the data limitation. In this paper, regional frequency analysis of maximum daily rainfall is investigated for Madinah province in the Western Kingdom of Saudi Arabia (KSA). The observed maximum daily rainfall records of 20 rainfall stations are selected from 1968 to 2015. The rainfall data is evaluated using four tests, namely, Discordance test (Di), Homogeneity test (H), Goodness of fit test (Zdist) and L-moment ratios diagram (LMRD). The Di of L-moments shows that all the sites belong to one group (Di <3.0).><1). Finally, the Zdist is used to evaluate five probability distribution functions (PDFs) including generalized logistic (GLO), generalized extreme value (GEV), generalized normal (GNO), generalized Pareto (GPA), and Pearson Type III (PE3). Zdist and LMRD both showed that PE3 distribution is the best among the other PDFs. The regional parameters of the candidate PDF are computed using L-moments approach and accordingly the regional dimensionless growth curve is developed. The results enhance the accuracy of extreme rainfall prediction at-sites and also they can be used for ungauged catchment in the region.
Implementing Oracle Utility-Meter Data Management For Power ConsumptionIJERDJOURNAL
ABSTRACT: In this digital mobile world, it‟s need of time to streamline and increase efficiency in business processes like effective data collection, measurement, automatic validation, editing and estimation of measurement data, analysis and dashboard for forecasting and ease in end user accessibility with Just in Time. This paper is following two methodology in this process. CEMLI is an extensive framework for developing and implementing for Oracle whereas OUM is business process and use case driven process which supports products, tool, technologies and documentation. This paper have focused on analytical data, system automation functionality along with prototype designing. For this, analysts and administrators will collect and define calculation rule for data collection and measurement, deployment methods, dashboards and security features. This paper gives measure understanding of cloud technologies and their features like services (SaaS), deployment methods, security and ability to reduce overhead cost, downtime, and automate business processes with 360 degree review and analysis. It consolidates data in one system with volumes of analog and interval data which facilitates new customer with offering and effective program. Also it maximizes return on investments and protects revenue through comprehensive exception management.
Business Intelligence - A Gift for Decision Maker for the Effective Decision ...IJERDJOURNAL
ABSTRACT: Business Intelligence is a socio-technical concept emerged to help managers especially in their decision making tasks. A manager with different decision making styles has been started to make use of business intelligence in their own ways. Are the all managers taking benefits of Business intelligence in the same way? Does Business intelligence give each category what they want in the decision making process? If the answer to these questions is – No, then what is the expectation of managers from BI having different decision making style? Will BI could satisfy their needs? If yes, then how? By using well-formed theory in different styles of decision making and taking BI capabilities into consideration this paper highlights the framework which defines appropriate BI capabilities with each decision making style. Study shows in order to serve each style of decision in which BI capabilities changes with respect to style. It is believed that by making BI customized based on decision making styles; BI would be the much more successful in serving all the categories of managers
Effect of Water And Ethyl Alcohol Mixed Solvent System on the Stability of Be...IJERDJOURNAL
ABSTRACT: The stabilities of ternary complexes of metal ions (copper, nickel, zinc and cobalt) with betahydroxy ketone(BHK) derivatives and benzotriazole(BTAZ) derivatives in various mixed solvent systems (Water+Ethyl Alcohol) medium in 0.1 M KNO3 ionic strength at 250C using pH metric titration method have been established. The data reveal that the copper forms more stable complexes, which is followed by zinc and Ni complexes with these ligands. Cobalt form less stable complexes with these ligands. The stabilities of these complexes are further quantified with Δ log K values, intra-molecular equilibrium constants and percentage of stacking interaction in the ternary systems. The observed positive Δ log K values suggest that the flexible side chain alkyl moiety (ethyl group, butyl group) or aromatic moiety (phenyl group) in BHK ligand overlaps with the fixed aromatic moiety of BTAZ ligand in the ternary complex, which results in the enhanced stabilities for the (BHK-Alk)-Metal(II)-BTAZ and (BHK-Ph)-Metal(II)-BTAZ systems. Interestingly, the positive Δ log K values for both BHK-Alk and BHK-Ph ligands in their corresponding ternary complexes are about the same. This suggests the flexible Alkyl or phenyl side chain of BHK is overlapping with the triazole ring, but not the phenoxy ring of the BTAZ ligand.
Design of Synthesizable Asynchronous FIFO And Implementation on FPGAIJERDJOURNAL
ABSTRACT: This paper presents a design of asynchronous FIFO which, along with the regular status signals, consists of some extra status signals for more user-friendly design and added safety. Gray code pointers are used in the design. For synchronisation purpose, two synchroniser modules are used which contain two D-flip-flops each. The design is implemented and synthesised at register transfer level (RTL) using Verilog HDL. Simulation and implementation is done using Xilinx ISE Design Suite. Further, the design is implemented on Basys 2 Spartan-3E FPGA Board. Asynchronous FIFO is used to carry out steady data transmission at high speeds between two asynchronous clock domains.
Prospect and Challenges of Renewable Energy Resources Exploration, Exploitati...IJERDJOURNAL
ABSTRACT: This paper enumerates the status and challenges of exploration, exploitation and development of renewable energy resources and its roles in sustainable development in Africa. A brief review of energy and renewable energy resources in Africa was succinctly done. The concept of sustainable development as it borders on the Renewable Energy Technologies and their roles were also discussed. The challenges facing the acceptance, deployment and promotion of Renewable Energy Technologies in Africa were also highlighted. The barriers were classified as; policy, regulation and institutional; information and technical capacity and financial. Recommendations were made towards solving problems peculiar to exploration, exploitation and development of Renewable Energy in entirety in Africa.
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Online aptitude test management system project report.pdfKamal Acharya
The purpose of on-line aptitude test system is to take online test in an efficient manner and no time wasting for checking the paper. The main objective of on-line aptitude test system is to efficiently evaluate the candidate thoroughly through a fully automated system that not only saves lot of time but also gives fast results. For students they give papers according to their convenience and time and there is no need of using extra thing like paper, pen etc. This can be used in educational institutions as well as in corporate world. Can be used anywhere any time as it is a web based application (user Location doesn’t matter). No restriction that examiner has to be present when the candidate takes the test.
Every time when lecturers/professors need to conduct examinations they have to sit down think about the questions and then create a whole new set of questions for each and every exam. In some cases the professor may want to give an open book online exam that is the student can take the exam any time anywhere, but the student might have to answer the questions in a limited time period. The professor may want to change the sequence of questions for every student. The problem that a student has is whenever a date for the exam is declared the student has to take it and there is no way he can take it at some other time. This project will create an interface for the examiner to create and store questions in a repository. It will also create an interface for the student to take examinations at his convenience and the questions and/or exams may be timed. Thereby creating an application which can be used by examiners and examinee’s simultaneously.
Examination System is very useful for Teachers/Professors. As in the teaching profession, you are responsible for writing question papers. In the conventional method, you write the question paper on paper, keep question papers separate from answers and all this information you have to keep in a locker to avoid unauthorized access. Using the Examination System you can create a question paper and everything will be written to a single exam file in encrypted format. You can set the General and Administrator password to avoid unauthorized access to your question paper. Every time you start the examination, the program shuffles all the questions and selects them randomly from the database, which reduces the chances of memorizing the questions.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
Water billing management system project report.pdfKamal Acharya
Our project entitled “Water Billing Management System” aims is to generate Water bill with all the charges and penalty. Manual system that is employed is extremely laborious and quite inadequate. It only makes the process more difficult and hard.
The aim of our project is to develop a system that is meant to partially computerize the work performed in the Water Board like generating monthly Water bill, record of consuming unit of water, store record of the customer and previous unpaid record.
We used HTML/PHP as front end and MYSQL as back end for developing our project. HTML is primarily a visual design environment. We can create a android application by designing the form and that make up the user interface. Adding android application code to the form and the objects such as buttons and text boxes on them and adding any required support code in additional modular.
MySQL is free open source database that facilitates the effective management of the databases by connecting them to the software. It is a stable ,reliable and the powerful solution with the advanced features and advantages which are as follows: Data Security.MySQL is free open source database that facilitates the effective management of the databases by connecting them to the software.
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Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual Conductor Power Cable
1. International Journal of Engineering Research and Development
e-ISSN: 2278-067X, p-ISSN: 2278-800X, www.ijerd.com
Volume 13, Issue 2 (February 2017), PP.44-54
44
Parametric Transient Thermo-Electrical PSPICE Model For
A Single And Dual Conductor Power Cable
Ralph Schacht 1*
,Sven Rzepka 2
1
Brandenburgische Technische Universitaet Cottbus-Senftenberg, Germany
2
Fraunhofer Enas, Chemnitz, Germany
ABSTRACT:A parametric macro model for a single and dual conductor power cable for transient
thermo-electrical coupled simulation in PSPICE will be derived. The articledepicts the modelling of a simplified,
single- and dual conductor cable and its use during simulation. Its verification against experiment and finite
element simulation shows a good agreement. The derived single- and dual conductor PSPICE cable macro model
enables a quick modelling at system level. It offers a time saving transient thermo-electrical simulation under
various thermal conditions and cable geometries and to optimize e.g. size, weight. The approach support the
engineer to overlook the thermal influences and temperatures along the power cable under real ‘thermal’
assembling conditions in an e.g. car engine room or aircraft.
Keywords: multi conductor power cable;coupledelectro-thermal macro model; transient, PSPICE
I. INTRODUCTION
With the increasing use of hybrid and electric vehicles, new challenges arise for the high-voltage
electrical system.Power cable should therefore be able to conduct high currents with the lowest possible weight
and under the increasing thermal stresses of the cable sheathing material. To optimize the electrical, weight and
reliability demands, it is useful to know the conductor core and the cable surface temperature in respect to
application conditions. These include the installation (conduction, convection and radiation), the ambient
temperature and the transient electrical load (e.g. PWM).Transient analytical temperature calculations are only
incompletely possible and numerical FE simulations cause high computing costs.
In literature [1 -5], the main motivation for research efforts has been the determination of the
steady-state and transient temperature rises in electric conductors carrying, constant loads, cyclic loads or short
overloads. In [6, 7], the partial differential equations for radial heat conduction in circular insulated conductors
have been solved by the use of Bessel functions. The complexity of this approach makes it difficult to apply it in
a comprehensive manner, e.g. to handle several conductors. Another approach to solve the heat transfer in
electronic components is based in the usage of lumped equivalent thermal models. The results provided by this
models have shown a good correlation[8-11]. The IEC 60287 Standard [12], which is well established in the
industry, described the use of this modelling approach. Itis based on electro-thermal analogy and has the great
advantage of intuitively understanding and can be easy implemented in a circuit simulator. It allows an easy
modelling of more complex electric systems.
This lumped equivalent thermal model approach will picked up to implement a library element for a
multi conductor cable to the application in a common network simulator,e.g. PSPICE.
In the following the approach, the results and the modelling for a single [13] and dual conductor cable
will be given. The approach will be verified by a numerical ANSYS model and by experiment. For the
experimental verification, a set-up to measure thetemperatureswas developed. It allows to determine the
conductor core, cable isolation and cable surface temperature by using thermocouples and an infrared camera.
A. Approach
The approach is to divide a cable into segments, which can be described as macro modules in a circuit
simulator (Figure 1). Each segment then can be assigned with the same or different thermal boundary condition,
depends on its build-in location during its course through an e.g. vehicle.
2. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
45
Fig. 1: The cable is divided into segments to describe its build-in location during its course.
Figure 2a and 2b show the modelling for a single and a dual conductor cable over the cable course.
Each segment is assigned by the same material and geometry properties, but can be assigned with different
thermal boundary condition, like conduction or convection and radiation.
Fig.2:The segments, in form of the macro modules, can be piece wisely connected in series to modelthe
cable under different thermal boundary conditions a) single conductor cable, b) dual conductor cable.
Table 1 sums up the considered module parameter to describe the parametric input variables, like the
current (static, transient), the temperature depend material properties, the geometric dimension and the boundary
conditions. At the cable ends the terminal temperature will be also considered.
Table I: PSPICE cable module input parameters and thermal boundary conditions.
Electrical
parameter
Thermal
parameter
Geometry
parameter
Boundaryconditions
core l TTerminal
iso dcore TAmb
I (static, transient) cp tiso hconv
hrad
To model and simulate the coupled behavior,the circuit simulator PSPICE was chosen. A circuit
simulator offers the advantage to model electrical and thermal behaviour and to have a time-saving transient
simulation on one simulator platform. This is possible, because the electrical and thermal behavior depends of
the same physically analogy.So, the thermal behaviour can be describedeasily in anequivalent thermal network
and the heat flux asa result of the electrical power loss of the temperature depended electrical conductor
resistance. Connecting both, the electrical and thermal network, a macro modulecan be realized.
In addition to the discrete temperatures of the cable conductor and the cable sheath, the
temperature-dependent voltage drop and the core resistance can be supplied via each cable module. 1 V
represents 1 ° C.
3. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
46
Figure 3 presents the principle approach for the parametric thermo-electric coupled macro module of a
single and double ladder cable. Table 2 shows the electrical, thermal, geometry and boundary parameters
involved.
Fig.3:Principle approach for the parametric thermo-electric coupled macro module for a) single
conductor cable and b) a dual conductor cable.
Table II: Material and geometry data as input for ANSYS and PSPICE models
lCable
[m]
dCore
[mm]
dIso
[mm]
dSheath
[mm]
Cu
[W/Km]
iso
[W/Km]
sheath
[W/Km]
Cu
[g/m³]
0.4 2.5 5 12 400 0.3 0.3 8950
iso
[g/m³]
sheath
[g/m³]
CpCu
[Ws/kgK]
Cp_Iso
[Ws/kgK]
Cp_sheath
[Ws/kgK]
Cu
[S/m]
Cu
[1/K]
950 950 381 1400 1400 59 0,00385
To enhance the accuracy a segment can be easily described by several sub-divided modules. To
implement the electrical and thermal network in a handynetwork simulator library element, figure 4shows the in
PSPICE realized macro modules for a single and a dual conductor cable. The given necessary model parameter
belongs to the library element.
Fig.4:Implemented PSPICE library elements for a) single conductor cable and b) a dual conductor cable.
II. RESULTS
In the following the results and itscomparisonand accuracy will be given for the single and dual
conductor cableapproach.
A. Single conductor cable model
4. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
47
Figure 5adelivers the temperature behavior with respect to conductor length. To show the temperature
dependent electrical behavior of the resistance(R = f(T) and R≠ f(T)) the results of a finite-element simulation,
using ANSYS, is additional given.
Fig.5:Conductor core temperature with respect to a) cable length (R = f(T) und R≠ f(T)) and b) to current
through the cable.
With increasing conductor length the temperature depending effect can be noticed, as expected.
Withincreasing the discretization of the conductorthe temperature behavior fits smoother to the ANSYS result.
The use of 5 modules (PSPICE 5- modules) in series instead of only one module (PSPICE 1-module) leads here
to a better accuracy.
Figure 5bdelightsthe temperature behavior with respect to the current through the cable. Here can be
noticed that up to I = 5 A,a discretization is neglectable.
Figure 6 and table 3 validates the results of the experiment and the ANSYS simulation with the results
of the PSPICE simulation. In this case a discretization of four over the cable length was chosen.
Fig. 6:Validation of the results between a) the experiment using an IR-camera,b) the ANSYS Model
and c) the PSPICE model
The temperatures at the cable terminals are determined by experimental investigation and were used as
input parameters for the ANSYS and PSPICE model setup. The temperatures were measured by using
thermo-couples assembled at the terminals, the centre of the cable surface by IR-thermography.
Table III.Comparison between the experiment, the ANSYS Model and the PSPICE model(TAmb = 23.6 °C).
variable Experiment ANSYS PSPICE
T core, center[°C] - 26.61 28.6
T Iso,center[°C] 29 26.56 28.4
T IN [°C] 32 32 32
T OUT [°C] 27 27 27
5. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
48
In case of the temperature different between the T core, center to T Iso, center, the results show a quite good
agreement between the ANSYS and PSPICE simulation. And even the measured
T Iso, centervalues fit quite well to the simulated ones.
B. Dual conductor cable model
Figure 7a verifies the experimental setup,which is described more in detail in section IV. It shows the
cable temperatures at different load currentsthrough conductor core 1,I1,for natural convection.The temperatures
were measured by thermo-couplesinstalled in different regions of the cable. The current through conductor
core 2 was off, I2 = 0 A. The used cable length was l = 1 m and the cable surface had an area of A = 12 mm².
The temperature behaviors show, as expected, a grading from the conductor core 1 over the isolation
layer in direction to the cable sheath 1 andas well as the grading behaviour of the inactive conductor 2 compared
the active conductor 1.
Fig.7: a) Evaluation of measured temperature values for a dual conductor cable for different load currents in
conductor core 1(I1) using thermo-couples, I2 = 0 A b) Comparison between the experimental results and the
ANSYS and PSPICE simulation results for different load currents in conductor core 1 (I1), I2 = 0 A.
Figure 7b compares the experimental results for the investigated dual conductor cable with the ANSYS and
PSPICE simulation results for different load currents in the active conductor core 1 (I1), I2 = 0 A.Depending on the
load current intensity, the deviations between simulation and measurement results were up to 10%. However, this
can be reduced by a more detailed discretization.
Figure 7b shows additional the centre cross section of the ANSYS model and the mesh for a two-core
cable with the insulation layer and its sheath as well as the temperature distribution at the electrical loads I1 = 50
A and I2 = 0 A. The thermal boundary conditions were set to hconv = 10 W/m²K and TTerminal = 33 ° C (symmetry
axis on half the cable length).
Figure 8 shows the transient temperature behavior in both cable conductors, with a stepwise current
increase from I1 = 0 A to 50 A, I2 = 0 A. The boundary conditions of the experiment were determined for the
PSPICE simulation so that they corresponded to the values of the external temperature sensors.
Fig. 8:Comparison between the experimental and PSPICE simulation results: Transient thermalstep responseat
the middle of the cable length (l = 0.2 m) for I1 = 50 A, I2 = 0 A, l = 0.4 m, hconv = 10 W/m²K, TTerminals = 33 °C,
TAmb = 28 °C.
6. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
49
Figure 9 shows the PSPICE model for this transient investigation. In this case a discretization of two
was chosen.The comparison shows a relatively good agreement between the temporal behavior of the
temperatures in the active and passive conductor core (table 4). The deviations are between 4% (passive
conductor) and 10% (active conductor).
Fig.9:PSPICE model for transient investigation with a discretization of two modules.
Table IV:Comparison between the experiment, the ANSYS Model and the PSPICE model at
t = 1800 s (T Amb = 28 °C, hconv = 10 W/mK).
variable Experiment PSPICE
T core1, center [°C] 56.4 61
T core2, center [°C] 46.8 48.7
T IN [°C] 33 33
T OUT [°C] 33 33
III. DISCUSSION
The modelling is based on a semi-analytical approach, which delivers an approximation of the real
geometry and the boundary condition of a multi-conductor cable. In this case, a higher discretization of the cable
length when using several macro modules leads to better results compared to e.g. ANSYS results. It can be
noticed that a discretization up to five modules for cable length of one metre show satisfactory thermal
simulation results for the investigated ranges of the electrical current and to heat transfer coefficient.
Acomparison with the experimental results shows satisfactory results as well.A first error estimate was
made between the PSPICE model, the FE model, and the experiment. The error between the experiment and
ANSYS model results was found to ~ 8% while the error between the experiment and PSPICE model was ~ 3%.
Also the transient comparison of a dual conductor cable PSPICE model shows a relatively good
agreement between the temporal behavior of the temperatures in the active and passive conductor core. The
deviations are conservative and between 4% (passive conductor) and 10% (active conductor).
It can be stated in principle that the approach can be used for further investigation of complex cable
harnesses on system level. Future research activities are planned in the direction to transfer the approach to a
real cable harnesses system installed in e.g. an engine compartment.
IV. MODELING
In order to model the electrical and thermal behavior of a single- or double-conductor cable, the
electrical and thermal subsystem must be subdivided in consideration of the physical relationship between
electrical power dissipation and core temperature. The analytical description of the physical behavior for each
subsystem must be based on the assumption that each subsystem can be transformed into the PSPICE circuit
simulator language.Afterwards, both subsystems are coupled and the PSPICE library model can be created.
First, the modeling for a single-conductor cable with simplified single-layer insulation is described
below. After that the modelling of a dual conductor cable will be shown.
Equation (1) describes the equilibrium relationship between the thermal and the electrical quantities.
Here, the thermal convection 𝑄conv. [W] and radiation 𝑄rad. [W] as well as the electrical power loss PD [W]. The
power loss can befurther described by the electrical current I [A] and the temperature-depended electrical
resistance of the electrically conductive conductorR(T) [].
)(2
.. TRIPQQ Dradconv (1)
A. Electrical system behaviour
7. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
50
The electrical part of the system focusses on the simulation of the temperature-dependent electrical
resistance of the electrically conductive conductor. The thermo-electrical behavior description of a single or dual
conductor cable is identically. With the help of system-theoretical functions, the properties of the PSPICE
network simulator could be reproduced.
Equations (2) and (3) describe the electrically temperature-dependent resistance behaviorR(T) and the
electrically temperature-dependent power loss behaviour PD(T).
Amb
core
TT
r
l
TR
1
)(
)( 2 (2)
ITVTRITPD )()(2
(3)
B. Thermal system behaviour
The thermo-electrical system description for a single and dual conductor cable is varying, because of
different thermal paths. Therefore this subsection is divided into two parts.
B.1One conductor cable
Figure 10 shows the geometrical definitions for the analytical description of the thermal resistances in
the longitudinal direction (a) of the conductor core and vertically (b) from the conductor core through the cable
insulation to the environment.
Fig.10:Thermal modeling of the cable behavior a) in longitudinal direction of the conductor core and b)
vertically to the conductor core.
Equation (4) derives the thermal resistancealong the conductor core using the input parameter thermal
conductivity core [W/ m K].
2_
2
corecore
coreth
r
l
R
(4)
The thermal resistance between ambient and the cable surface (isolation layer) is given in (5).
l
r
r
R
iso
core
Iso
Isoth
2
ln
_
(5)
Equation (6) describes the heat resistance due to the heat transfer coefficient due to the convection over
the cable surface using the macro model input parameterhconv [W/m²K].
Isoconvconv
convth
rlhAh
R
2
11
_ (6)
The heat transfer and the thermal resistance due to radiation over cable surface is given in (7) and (8).
Km
W
TT
TT
h
AmbS
AmbSS
rad 2
44
(7)
Isoradrad
radth
rlhAh
R
2
11
_ (8)
Equations (9) and (10) describe the transient properties using the thermal heat capacities of the
conductor core and the insulation layer.
2
,_ corecorecorepcoreth rlcC (9)
22
,_ coreIsoISOIsopIsoth rrlcC (10)
B.1.2Singleconductor cable model in PSPICE
8. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
51
Figure 11 shows the thermo-electric coupled model in developed in PSPICE and its input parameters
(material and geometry data, electrical and thermal boundary conditions) and the designed library element.
Fig.11: a) PSPICE model description, b) library symbol of the macro module.
B.2. Dual conductor cable
Equation (11) describes the thermal resistance of the conductor core between the cable end terminals.
2
2
2,1_
corecore
l
coreth
r
R
, (11)
The thermal resistance for the cable isolation and the cable sheathing can be found by means of the
equations (12) and (13).
lx
r
r
R
isoai
core
Iso
aiIsoth
2
ln
,
,_
(12)
lx
r
r
R
sheathai
Iso
sheath
aisheathth
2
ln
,
,_
(13)
The parameters xi and xa(figure 12) describe the radial portion of the heat interactionbetween the
conductor coresand to the cable surface.
Fig.12:Modelling the thermal interaction between the conductors and to the cable surface.
It depends on the core and cable diameter as well as the conductor spacing. In a first approximation,
xi = xa =1
2
can be set here (equation 14).
ai xx 1 (14)
Equation (15) describes the convective heat resistance which acts across the cable surface, with the use
of the heat transfer coefficient hconv [W/m²K].
sheathconvconv
convth
rlhAh
R
11
2,1_ (15)
According to [14], for natural convection the heat transfer coefficient hconv can be described as a
function of the cable surface diameter d [m] and the surface temperature difference to ambient T [K] according
to equation (16).
9. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
52
2
6
1
2
1
0932.1
1
1254.0
T
d
hconv (16)
The heat radiation across the cable surface is modelled by equations (17) and (18)using the emissivity
, the Stefan-Boltzmann constantS [W/K4
m²] and the surface temperature TS [K] and the ambient
temperature TAmb [K].
Km
W
TT
TT
h
AmbS
AmbSS
rad 2
44
(17)
Isoradrad
radth
rlhAh
R
11
2,1_
(18)
Equations (19-21) determine the thermal capacitances cth,xx using the specific heat capacities cp,xx
[Ws/kgK] and material densities XX [kg/m³] for the conductor core as well as the insulation and sheathing
material.
2
,_ coreKerncoreCupcoreth rlcC (19)
22
,_ coreIsoIsoIsopIsoth rrlcC (20)
22
,_ Isosheathsheathsheathpsheathth rrlcC (21)
V. EXPERIMENTAL SET-UP FOR TWO-CORE CABLE
For the experimental verification of the simulation model, J-type thermos-couple sensors were inserted
by drilling holes into the two conductor cable as given in figure 13. The diameter of a sensor is d = 0.5 mm.
Fi.13:Arrangement / assembling of the temperature sensors.
Additional temperature sensors were measuring the temperatures at the terminals of the cable ends as
well as the ambient temperature.
VI. CONCLUSIONS
With the extended double core conductor cable PSPICE model, transient simulations can be investigated
at system level under various thermal and electrical boundary conditions, as well as cable materials and
geometries, taking into account the insulation and sheath structure. The static validation between the PSPICE, FE
model and the experiment shows a suitable agreement. This is dependent on the discrediting of the cable length.
The transient PSPICE model behavior has also shows an acceptable agreement.
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NOMENCLATURE
A area, m²
l cable length, m
d diameter, m
r radius, m
t isolation thickness, m
x parameter, -
PD electrical power dissipation, W
R electrical resistive,
V Voltage, V
I current, A
electrical conductivity, S/m
electrical temperature coefficient, 1/K
Qconvthermal convection, W
Qradthermal radiation, W
Qel electrical power dissipation, W
Tambambient temperature, K
T temperature difference, K
h heat transfer coefficient, W/m²K
Rth thermal resistive, K/W
thermal conductivity, W/mK
Cth thermal capacitance, Ws/K
cp specific heat capacitance, Ws/kgK
density, g/m³
surface emissivity, -
s Stefan-Boltzmann constant, W/K4
m²
Subscripts
Coreconductor metal core
iso core isolation layer
sheathcover of cable
Ssurface
rad radiation
11. Parametric Transient Thermo-Electrical PSPICE Model For A Single And Dual
54
convconvection
Abbreviation
PWMPulse Width Modulation
BC Boundary Condition