In many developing countries, domestic electricity consumers having single phase appliances are most times supplied with single phase meters with incoming three phase supply lines. Due to frequent phase faults, these customers often change their supply from one phase to another whenever there is low voltage or no supply in the phase they are currently connected to. This action coupled with the fact that there is uneven distribution of loads on the distribution transformers in residential areas, lead to more transformer overload with consequential loss of power, equipment, man-hours, revenue and in extreme cases, life. When electricity was treated as a welfare commodity or as part of government social responsibility, these consequences where ignored. But with commercialization, privatization and deregulation, cost minimization and profit maximization have become the watchwords. As a means of minimizing this, utilizing the concept of phase-constrained electricity billing scheme in the deregulated Nigerian Power Industry was presented in this work. The phaseconstrained billing model involves re-arranging the service lines and setting up constraint matrices to relate the phase and service lines utilizable by customer to the electricity bill using penalty factors. To test the acceptability of this model, a customer behavior and utilization index based questionnaires were administered in the field. The survey was analyzed using the statistical attitude measurement technique based on the 5-point Likert Scale. The responses obtained showed that introducing a penalty factor in the billing which ensure that those using more phases pay higher will minimize frequent change of phases; and provide a direction for utilities and customers in resolving the power quality and availability problems associated with frequent phase changing.
As a power distribution solutions provider, UGL Limited provides the foundation for green cities and energy efficient infrastructures. Learn more about its services.
The utility landscape is dynamic. Some pundits claim that traditional utility regulation is becoming obsolete. Others are calling for a complete overhaul of utility ratemaking as we know it; distributed energy resources, technology advancements and societal trends are changing the way utilities function. In such turbulent times, how can utilities manage their financials through rate structures? How can utilities bridge the span between the rate and regulatory frameworks of yesterday and tomorrow? One way to do so is to revisit the design of rate offerings available to all utility customers and to residential customers in particular.
Affordable 24x7 Power To All @2019 - Key Strategies (Improve and Enhance Dist...Resurgent India
Affordable 24x7 Power To All @2019 - Key Strategies (Improve and Enhance Distribution Network ) - Part - 4
Presence of a robust distribution network is vital to achieve ‘affordable power to all by 2019’. At present, the distribution network in the country comprises of a total of 8,603,136 circuit kilometers of distribution lines catering to nearly 200 million consumers.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
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As a power distribution solutions provider, UGL Limited provides the foundation for green cities and energy efficient infrastructures. Learn more about its services.
The utility landscape is dynamic. Some pundits claim that traditional utility regulation is becoming obsolete. Others are calling for a complete overhaul of utility ratemaking as we know it; distributed energy resources, technology advancements and societal trends are changing the way utilities function. In such turbulent times, how can utilities manage their financials through rate structures? How can utilities bridge the span between the rate and regulatory frameworks of yesterday and tomorrow? One way to do so is to revisit the design of rate offerings available to all utility customers and to residential customers in particular.
Affordable 24x7 Power To All @2019 - Key Strategies (Improve and Enhance Dist...Resurgent India
Affordable 24x7 Power To All @2019 - Key Strategies (Improve and Enhance Distribution Network ) - Part - 4
Presence of a robust distribution network is vital to achieve ‘affordable power to all by 2019’. At present, the distribution network in the country comprises of a total of 8,603,136 circuit kilometers of distribution lines catering to nearly 200 million consumers.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Voltage Stability & Power Quality Assessment of Distributed Generation Based ...ijsrd.com
This paper demonstrated the power quality & voltage stability problems associated with the renewable based distribution generation systems and how the Flexible AC Transmission System (FACTS) device such as Static Synchronous Compensator (STATCOM) play an important role in Power Quality Improvement. First we simulated the wind farm system without STATCOM and after the system simulated with STATCOM. We use the MATLAB/Simulink software for Simulation.
These slides present at an introduction level about the demand side management and demand response in smart micro-grid system. Later mathematical modelling and detail on optimization techniques will be covered.
Role of UPQC in Distributed Generation Power System: A Reviewijtsrd
The ever increasing share of renewable energy sources (RERs) in the todays scenario, the power grids are suffering from poor power quality due to the intermittent nature of wind and solar based power generating units. The led to extensive research in the field of power quality especially in voltage and frequency regulations Distributed generation involving RERs has become more popular in recent years due to technological advancement and has been started increasingly used in industry. It has become more important to understand the integration of these systems through PE interface with the existing electric power systems networks. At the same time, high frequency switching of Power Electronic interface has caused major Power Quality concerns, which has been tackled with the help of Custom power devices interfaces that has allowed DG to offers various benefits like ability to provide ancillary services, increased energy efficiency, increased functionality through improved power quality and voltage/VAR support, improved electrical system reliability by reducing the fault contributions, and flexibility in operations with various other DE sources. DG also allows the customer to have a choice while it reduces the overall interconnection costs. This paper focuses on widespread use of DG through various Renewable Energy Sources, Power Quality issues associated with the use of Power Electronic interface and use of various Custom Power Devices to improve Power Quality. It particularly evaluates the role of UPQC-DG in various modes of DG in following PQ standards. Sajid Bashir | Gagan Deep Yadav"Role of UPQC in Distributed Generation Power System: A Review" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, URL: http://www.ijtsrd.com/papers/ijtsrd11356.pdf http://www.ijtsrd.com/engineering/electrical-engineering/11356/role-of-upqc-in-distributed-generation-power-system-a-review/sajid-bashir
Evaluation of losses in distribution networks of selected industrial cities i...Dr. Hachimenum Amadi
Distribution losses contribute to energy shortages and therefore power outages in Nigeria’s industries. This work evaluated the technical losses in the distribution networks of selected industrial cities in Nigeria. Power flow simulation of network data collected over the period 2011-2015 from three distribution companies (DisCos) domiciled in these cities was done by Newton-Raphson (N-R)
technique using the Electrical Transient and Analysis Program (ETAP) software version 12.6.
Results of the power flow simulation showed that between 2011 and 2015 covered by the study, the cities of Lagos, Kano and Port Harcourt recorded a total power loss of 15.8 MW, 36.2 MW and 6.04 MW respectively. The findings also revealed that overloaded power transformers is part of the reasons for high losses in the distribution networks of some of the cities. The outcome of the study provides a guide for system planners and utility companies in providing for prioritization and system
upgrade to ensure improved efficiency of their distribution networks.
Neural computing is now one of the most promising technologies in all fields of engineering,
resulting in the development of a number of Artificial Neural Networks (ANN). Double circuit transmission lines
are being employed in the distribution of power to consumers and have become more widespread than single
transmission line, as they increase the electric power transmission capacity and the reliability of an electrical
system. Losses along transmission lines occur due to faults. Possible faults on the transmission line were
predicted using Artificial Neutral Network. In this work, the simulation of fault on a 132kV double circuit
transmission lines using MATLAB was undertaken. Parameters considered during the simulation were the input
of the network which is the fault current value at each fault location while the output of the network is the fault
location. The efficiency of the neural network was tested and verified. This approach provided satisfactory
results with accuracy of 95% or higher.
Voltage Stability & Power Quality Assessment of Distributed Generation Based ...ijsrd.com
This paper demonstrated the power quality & voltage stability problems associated with the renewable based distribution generation systems and how the Flexible AC Transmission System (FACTS) device such as Static Synchronous Compensator (STATCOM) play an important role in Power Quality Improvement. First we simulated the wind farm system without STATCOM and after the system simulated with STATCOM. We use the MATLAB/Simulink software for Simulation.
These slides present at an introduction level about the demand side management and demand response in smart micro-grid system. Later mathematical modelling and detail on optimization techniques will be covered.
Role of UPQC in Distributed Generation Power System: A Reviewijtsrd
The ever increasing share of renewable energy sources (RERs) in the todays scenario, the power grids are suffering from poor power quality due to the intermittent nature of wind and solar based power generating units. The led to extensive research in the field of power quality especially in voltage and frequency regulations Distributed generation involving RERs has become more popular in recent years due to technological advancement and has been started increasingly used in industry. It has become more important to understand the integration of these systems through PE interface with the existing electric power systems networks. At the same time, high frequency switching of Power Electronic interface has caused major Power Quality concerns, which has been tackled with the help of Custom power devices interfaces that has allowed DG to offers various benefits like ability to provide ancillary services, increased energy efficiency, increased functionality through improved power quality and voltage/VAR support, improved electrical system reliability by reducing the fault contributions, and flexibility in operations with various other DE sources. DG also allows the customer to have a choice while it reduces the overall interconnection costs. This paper focuses on widespread use of DG through various Renewable Energy Sources, Power Quality issues associated with the use of Power Electronic interface and use of various Custom Power Devices to improve Power Quality. It particularly evaluates the role of UPQC-DG in various modes of DG in following PQ standards. Sajid Bashir | Gagan Deep Yadav"Role of UPQC in Distributed Generation Power System: A Review" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, URL: http://www.ijtsrd.com/papers/ijtsrd11356.pdf http://www.ijtsrd.com/engineering/electrical-engineering/11356/role-of-upqc-in-distributed-generation-power-system-a-review/sajid-bashir
Evaluation of losses in distribution networks of selected industrial cities i...Dr. Hachimenum Amadi
Distribution losses contribute to energy shortages and therefore power outages in Nigeria’s industries. This work evaluated the technical losses in the distribution networks of selected industrial cities in Nigeria. Power flow simulation of network data collected over the period 2011-2015 from three distribution companies (DisCos) domiciled in these cities was done by Newton-Raphson (N-R)
technique using the Electrical Transient and Analysis Program (ETAP) software version 12.6.
Results of the power flow simulation showed that between 2011 and 2015 covered by the study, the cities of Lagos, Kano and Port Harcourt recorded a total power loss of 15.8 MW, 36.2 MW and 6.04 MW respectively. The findings also revealed that overloaded power transformers is part of the reasons for high losses in the distribution networks of some of the cities. The outcome of the study provides a guide for system planners and utility companies in providing for prioritization and system
upgrade to ensure improved efficiency of their distribution networks.
Neural computing is now one of the most promising technologies in all fields of engineering,
resulting in the development of a number of Artificial Neural Networks (ANN). Double circuit transmission lines
are being employed in the distribution of power to consumers and have become more widespread than single
transmission line, as they increase the electric power transmission capacity and the reliability of an electrical
system. Losses along transmission lines occur due to faults. Possible faults on the transmission line were
predicted using Artificial Neutral Network. In this work, the simulation of fault on a 132kV double circuit
transmission lines using MATLAB was undertaken. Parameters considered during the simulation were the input
of the network which is the fault current value at each fault location while the output of the network is the fault
location. The efficiency of the neural network was tested and verified. This approach provided satisfactory
results with accuracy of 95% or higher.
Power distribution system fault monitoring device for supply networks in NigeriaIJECEIAES
Electric power is the bedrock of our modern way of life. In Nigeria, power supply availability, sufficiency and reliability are major operational challenges. At the generation and transmission level, effort is made to ensure status monitoring and fault detection on the power network, but at the distribution level, particularly within domestic consumer communities there are no fault monitoring and detection devices except for HRC fuses at the feeder pillar. Unfortunately, these fuses are sometimes replaced by a copper wire bridge at some locations rendering the system unprotected and creating a great potential for transformer destruction on overload. This study is focused on designing an on-site power system monitoring device to be deployed on selected household entry power cables for detecting and indicating when phase off, low voltage, high voltage, over current, and blown fuse occurs on the building’s incomer line. The fault indication will help in reducing troubleshooting time and also ensure quick service restoration. After design implementation, the test result confirms design accuracy, device functionality and suitability as a low-cost solution to power supply system fault monitoring within local communities.
The aim of the project is to minimize the queue at the energy meter billing counters and to restrict the usage of energy meter automatically, if the bill is not paid. The project also aims at proposing a system that will reduce the loss of power and revenue due to power thefts and other illegal activities. The work system adopts a totally new concept of “Prepaid Energy Meter”. The GSM technology is used so that the consumer would receive messages about the consumption of power (in watts) and if it reaches the minimum amount, it would automatically alert the consumer to recharge. This technology holds good for all electricity distribution companies, private communities, IT parks and self-containing housing projects. The implementation of this project will help in better energy management, conservation of energy and also in doing away with the unnecessary hassles over incorrect billing. The automated billing system will keep track of the real time consumption and will leave little scope for disagreement on consumption and billing.It is observed that one of the faulty subsystems contributing to the huge revenue loss in Nigerian Power Sector is the metering and billing system. Errors get introduced at every stage of energy billing, like: errors with electro-mechanical meters, human errors while noting down the meter reading; and error while processing the paid bills and the due bills. The remedy for this drawback is a prepaid energy billing. There are clear results from many countries, where prepaid system has reduced the revenue loss by a large amount. A GSM-based Energy Recharge Interface which contains a prepaid card equivalent to a mobile SIM card. The prepaid card communicates with the power utility using GSM communication network. Once the prepaid card is out of balance, the consumer load is disconnected from the utility supply by the latching Relay (contactor). The power utility can recharge the prepaid card remotely through GSM/SMS mode base on customer requests. The results obtained shows good system performance. A prior billing is bound to do away with the problems of unpaid bills and human error in meter readings, thereby ensuring justified revenue for the utility
The aim of the project is to minimize the queue at the energy meter billing counters and to restrict the usage of energy meter automatically, if the bill is not paid. The project also aims at proposing a system that will reduce the loss of power and revenue due to power thefts and other illegal activities. The work system adopts a totally new concept of “Prepaid Energy Meter”. The GSM technology is used so that the consumer would receive messages about the consumption of power (in watts) and if it reaches the minimum amount, it would automatically alert the consumer to recharge. This technology holds good for all electricity distribution companies, private communities, IT parks and self-containing housing projects. The implementation of this project will help in better energy management, conservation of energy and also in doing away with the unnecessary hassles over incorrect billing. The automated billing system will keep track of the real time consumption and will leave little scope for disagreement on consumption and billing.It is observed that one of the faulty subsystems contributing to the huge revenue loss in Nigerian Power Sector is the metering and billing system. Errors get introduced at every stage of energy billing, like: errors with electro-mechanical meters, human errors while noting down the meter reading; and error while processing the paid bills and the due bills. The remedy for this drawback is a prepaid energy billing. There are clear results from many countries, where prepaid system has reduced the revenue loss by a large amount. A GSM-based Energy Recharge Interface which contains a prepaid card equivalent to a mobile SIM card. The prepaid card communicates with the power utility using GSM communication network. Once the prepaid card is out of balance, the consumer load is disconnected from the utility supply by the latching Relay (contactor). The power utility can recharge the prepaid card remotely through GSM/SMS mode base on customer requests. The results obtained shows good system performance. A prior billing is bound to do away with the problems of unpaid bills and human error in meter readings, thereby ensuring justified revenue for the utility.
This report gives a comprehensive overview of the potential benefits of the smart meters and how they can save billions of rupees to Pakistan over a short period of time. Furthermore, it convinces the reader how the world is actively allocating its resources towards smart meters and how Pakistan is in desperate need of efficient use of energy which can only be facilitated b smart meters.
Various demand side management techniques and its role in smart grid–the stat...IJECEIAES
The current lifestyle of humanity relies heavily on energy consumption, thusrendering it an inevitable need. An ever-increasing demand for energy hasresulted from the increasing population. Most of this demand is met by thetraditional sources that continuously deplete and raise significantenvironmental issues. The existing power structure of developing nations isaging, unstable, and unfeasible, further prolonging the problem. The existingelectricity grid is unstable, vulnerable to blackouts and disruption, has hightransmission losses, low quality of power, insufficient electricity supply, anddiscourages distributed energy sources from being incorporated. Mitigatingthese problems requires a complete redesign of the system of powerdistribution. The modernization of the electric grid, i.e., the smart grid, is anemerging combination of different technologies designed to bring about theelectrical power grid that is changing dramatically. Demand sidemanagement (DSM) allow customers to be more involved in contributors tothe power systems to achieve system goals by scheduling their shiftableload. Effective DSM systems require the participation of customers in thesystem that can be done in a fair system. This paper focuses primarily ontechniques of DSM and demand responses (DR), including schedulingapproaches and strategies for optimal savings.
The project involves determining real time electricity charges incurred by the residential consumers. The smart grid integrated with residential PV systems was modeled in Simulink to determine demand response in dynamic pricing environment. Based on the load demand, electricity charges were calculated and compared with flat rate charges to highlight cost savings.
GM Distributed Generation Inverters in a Micro grid by Controlling Energy Man...IOSRJEEE
This project introduces a micro grid, which consists of different distributed generation units which are connected to the distribution grid. The operations of the DG units are coordinated by the power management algorithm in grid and islanded operations. The primary generation unit of the micro grid is the wind turbine and the proton exchange membrane fuel cell is used to supplement the variability in the power. In micro grid a battery is incorporated to overcome the difficulty of shortage of power demand during Islanded operation and to improve crest demands throughout grid connected operation. Previously the power management system was done using model predictive algorithm control design. Which has complex mathematical calculations to find out critical values Now in this project, ANFIS controller is used as the control design which reduces the design complexity as the logical operations are performed to find out critical values, the power quality such as harmonic compensation for nonlinear loads of the distribution system, will be improved when compared to model predictive algorithm control design and also It has fast response. The complete proposed system will be tested using MATLAB/SIMULINK and the simulation results reveal the attractive performance characteristics of the proposed system.
Load Performances of a PIC Based Speed Governor for Micro Hydro Power PlantIOSRJEEE
In the study; a micro hydro power plant prototype was designed with a 750 Wcross flow type turbine and a 500 W generator. Control operations are realized by using a PIC16F877 microcontroller. The voltage frequency obtained from the generator were measured with the zero crossing circuit and transferred to the microcontroller. Using the micro controller, depending on the frequency error, the PWM signal was formed. The PWM signal was applied through the H bridge circuit to the DC motor which drives the setting wing. The rotation movement of the motor was transferred to the setting wing through a threaded rod and a mechanical arm. When setting of the number of turns on the turbine, the value of the frequency of the used 500 W generator working in conjunction with the turbine could be kept on desired levels. After the design,Loading and load shedding performances of the designed system were examined and discussed.
A New Design in Parabolic Trough Using Heat RetentionIOSRJEEE
The paper gives the summary of new design of parabolic trough using heat retention method. It gives a brief idea of on heat retention and describes about the components and operation of parabolic trough. This is an updating of parabolic trough collector system. The advantages collectors are also discussed
Investigation of Power Quality Indices in Jordanian Distribution GridIOSRJEEE
he sensitivity and the highly connected modern power systems make Power quality problems a priority in these systems. Both utilities and consumers have essential role in dealing with these problems. It is utilities responsibility to provide a clean and reliable power. On the other hand, it is consumer’s responsibility to draw power with acceptable indices. In this Paper, the type of the consumer’s facility is chosen as a basis for managing power quality indices. In this paper, comprehensive power quality in Jordan Low-Voltage Electrical Power Grid is measured. The loads are divided into five categories: : (i) industrial loads, (ii) commercial loads, (iii) hospital loads, (iv) residential loads, and (v) office loads. Assuming each category will affect the grid in similar way, which will facilitate prediction of power quality problems. Also, this methodology will help proposing new regulation that governs the relation between utilities and consumers. The power quality indices considered in this paper are; THD, Crest factor, K-factor, Power factor, Harmonic to active power ratio, Voltage imbalance, and Frequency variations. The results show similar results for the loads with the same type. Also, the results show the correlation between the current total harmonic distortion and utility voltages and neutral-to-ground voltage, and between voltage and current imbalance.
High Efficiency Dc-Dc Converter for Renewable Energy Applications and High Vo...IOSRJEEE
Renewable sources like solar PV cell is prefer to be operated at low voltages. This paper proposes a novel high voltage gain, high efficiency dc-dc converter based on coupled inductor, intermediate capacitor. The input energy acquired from the source is first stored in the coupled inductor and intermediate capacitor in a lossless manner. Improve the voltage gain and efficiency of the system. Exorbitant duty cycle values are not required for high voltage gain, when prevent the problems such as diode reverse recovery. Presence of a passive clamp network causes reduced voltage stress on the switch. Overall performance of the renewable energy with a step-up DC/DC converter using closed loop control action is used in the proposed system, improving the overall efficiency of the system.
Performance Indicators For Grid-Connected PV Systems: A Case Study In Casabla...IOSRJEEE
The main goal of this paper is to compare a one year performance of 5.94 KWp grid-connected PV module technology systems, constituted by three types of photovoltaic solar panels (Monocrystalline (mc-Si) (2.04KWp), polycrystalline (pc-Si) (2.04KWp) and amorphous (a-Si) (1.86 KWp))-silicon installed on the roof of the faculty of science Ben M’sik Casablanca. The study is based on the data collected along 2 years (2015- 2016) about energy production. The elements of performance evaluated monthly and annually include: energy output, system efficiency, reference yield, final yield, performance ratio, annual capacity factor and CO2 emissions avoided. The investigation of the annual: productivity (EAC,Y), system efficiency (Ƞ푠푦푠 ,푌 ), performance ratio (PR), capacity factor (CF) and amount of CO2 emissions avoided for a-Si are found as 2941.15KWh, 7.21%, 73.1%, 18.05% and 1.765tonsrespectively. EAC,Y, Ƞ푠푦푠,푌 , PR, CF and amount of CO2 emissions avoided for pc-Si are found as 3331.15KWh, 11.4%, 75.6%, 18.64% and 1.999tons respectively. Mc-Si installation exhibits slightly higher values of EAC,Y, Ƞ푠푦푠 ,푌 , PR, CF and amount of CO2 emissions avoided which are 3370.89KWh, 11.7%, 76.7%, 18.86% and 2.023tons respectively. The results show that mc-Si system presents the best performance followed by pc-Si and by a-Si. In addition, a developed study was carried out to establish the relation between the efficiency and temperature, performance ratios and radiation, in order to know the behavior of each technology for each period of the year and for the whole year. Without forgetting a comparison of all results found with the previous studies in different locations.
A Review of Gas Sensors Based on Semiconducting Metal OxideIOSRJEEE
This study intends to provide a review of recent progress in gas sensors based on several theoretical and empirical investigations regarding semiconducting metal oxide nanostructures. Modified or doped oxide nano-wires, device structures such as electronic noses and low power consumption self-heated gas sensors, and their gas sensing performance has also been evaluate. Finally, the researcher also point out some challenges for prospect investigation and practical application.
Stability Control System for a Two-WheelerIOSRJEEE
A two-wheeler is statically unstable but as the speed increases vehicle achieves stability. At low speed, the vehicle loses its stability. In order to achieve stability, the driver has to balance the vehicle. While negotiating a curve, a vehicle has to lean to a certain angle, if this angle exceeds the certain value, the vehicle tends to skid. In this paper the stability control system is incorporated, so that a vehicle will maintain stability even at low speeds. The stability of a two-wheeler depends on weight distribution, tyre dynamics, speed and steering angle. In this paper, only two parameters are considered, one is steering effect and another one is speed. For developing a simplified model, the speed of the vehicle is kept as constant, using which the effect of steering angle is analysed and accordingly a controller is incorporated for providing stability.
Voltage Sag and Swell Identification Using FFT Analysis and Mitigation with DVRIOSRJEEE
- Power quality issues like voltage sag, swell, harmonics and transients can affect the power system performance. Voltage sag and swell are now-a-days treated to reduce power quality issues by power engineers. A small variation in voltage can badly affect the operation of power system and connected loads as well. This paper presents the voltage sag and voltage swell identification using FFT analysis. The paper also presents the mitigation for identified voltage sag and swells issues addressed with DVR. DVR consists of a voltage source converter and is controlled with d-q theory which is simple producing reference signals and gate pulses for switches of DVR. The proposed concept was simulated using MATLAB/SIMULINK software and results were presented for identification and mitigation. FFT analyses for identification of voltage sags and swell existence in different phases of power system network were shown. Mitigation of voltage sag and swell with DVR was also shown with results
Design of Intrusion Tolerance System based on Service Redundancy LevelIOSRJEEE
The Internet is an open space where a great number of computer systems are connected. Since many services are provided through the Internet, malicious users can easily intrude on any of those systems by using the vulnerabilities of the Internet. Although Intrusion Detection and Prevention System (IDPS) can be used to defend against such malicious activities, it is not always possible to completely protect a targeted system against the attacks. For this reason, Intrusion Tolerance Systems (ITS) has been proposed to maintain services even in threatening environments, where some malicious attacks have intruded into a system successfully. In this paper, we propose a new ITS based upon maintaining a service redundancy level to ensure that all services are properly provided to users even if a malicious intrusions such as VM (virtual machine) escape attack exists. The simulation results show that the proposed scheme can guarantee the operation of every ongoing service by maintaining the service redundancy level of all services
Compensation of Harmonics of Fully Controlled Loads by Using SAHFIOSRJEEE
In this paper, Three Phase Shunt Active Harmonic Filter is used for harmonic compensation of fully Controlled loads by using new thyristorized Pulse Generator Circuits which generates 12 Pulses for two NonLinear three phase Loads. The three phase Non-Linear Loads are connected at the secondary of three phase Transformers with Three Phase Breakers having Transition time 5/60seconds. A new Pulse Generator topology is used for generating pulses for each of three phase non-linear loads. The Circuit used for Compensation of Harmonics having three phase IGBT based Inverter. The IGBT base d Shunt Active Harmonic Filter gets firing Pulses from PLL phase Locked Loop& Hysteresis Switching HS. The used PLL extracts the Fundamental component of load current which is then multiplied with same RMS gain for generating the Reference current for Hysteresis Current Controller. The used Hysteresis Current Controller compares the reference current
Design of Half Bridge LLC Resonant Converter for Low Voltage Dc ApplicationsIOSRJEEE
An advanced hybrid LLC series resonant converter with united flying-capacitor cell is proposed in this paper to permit the high step-down conversion in the high input voltage applications. The in-built flyingcapacitor branch in the primary side can efficiently share out the primary switch voltage stress related with the half-bridge LLC converters. And the input voltage can be shared correspondingly and automatically between the two series half-bridge components lacking additional balance circuit or control strategies owing to the built-in flying- capacitor cell. Likewise, the inherent soft switching performance in extensive load range that exists in the LLC converters is still kept to decrease the switching losses, which ensures the high efficiency. In addition, the proposed converter can be comprehensive to reduce the switch voltage stress byemploying stacked connection. Finally, a 500∼640 Vinput 48 Voutput 1 kW prototype is built and tested to verify the efficiency of the proposed converter. The results prove that the proposed converter is an excellent candidate for the high input voltage and high step-down dc/dc conversion systems.
Design of the Pulse Oximetry Measurement Circuit and Its Sensing System Based...IOSRJEEE
The pulse oximetry circuit and its sensing system is designed based on the standard CMOS technology of 0.18um. The reflection oxygen sensor is used to collect the pulse oximeter signal of human body, then the collected physiological signals are processed by the data processing circuit The data processing circuit is composed of two parts: the amplifying circuit and the band-pass filter circuit, and the pulse oximeter data processed by the data processing circuit is written into the tag through the SPI communication The RFID reader read the data in the RFID tag through wireless communication, and display the data . The experimental results show that the maximum error is ±1%. The maximum error of the pulse is ±1.9%. The stability and feasibility of pulse blood oxygen sensing system is demonstrated in this paper and it will have a good application prospect in the direction of wearable medical wisdom research
Design of an Integrated Power Factor Converter with PI Controller for Low Pow...IOSRJEEE
In this paper, an integrated power factor converter with PI controller is proposed. The circuit topology is obtained by integrating two converters namely the buck converter and a boost converter. The boost converter is normally a step up converter which obtain an unity power factor and performs low harmonics at the input. Based on the simple circuit topology and easy control the boost converter or buck-boost converter is used as power factor correctors. Similarly the buck converter regulates the dc-link voltage and provide a stable dc output voltage. To achieve unity power factor, the output voltage of both converter should be higher than the amplitude of the ac line voltage. The steady -state analysis is developed and a design is provided
Magneto Optic Current Transformer Technology (MOCT)IOSRJEEE
An accurate electric current transducer is a key component of any power system instrumentation. To measure currents power stations and substations conventionally employ inductive type current transformers .For high voltage applications, porcelain insulators and oil-impregnated materials have to be used to produce insulation between the primary bus and the secondary windings. The insulation structure has to be designed carefully to avoid electric field stresses, which could eventually cause insulation breakdown. The electric current path of the primary bus has to be designed properly to minimize the mechanical forces on the primary conductors for through faults. The reliability of conventional high-voltage current transformers have been questioned because of their violent destructive failures which caused fires and impact damage to adjacent apparatus in the switchyards, electric damage to relays, and power service disruptions. In addition to the concerns, with the computer control techniques and digital protection devices being introduced into power systems, the conventional current transformers have caused further difficulties, as they introduce electromagnetic interference through the ground loop into the digital systems. Magneto-optical current transformer(MOCT)technology provides a solution for many of the above mentioned problems. The MOCT measures the electric current by means of Faraday Effect that is the orientation of polarized light rotates under the influence of the magnetic fields and the rotation angle is proportional to the strength of the magnetic field component in the direction of optical path. MOCT is a passive optical current transducer which uses light to accurately measure current on high voltage systems and determines the rotation angle & converts it into a signal of few volts proportional to the current
On Essentiality of RoHS in EE R&D EcosystemIOSRJEEE
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Three phase induction motors are employed in almost all the industries because of its simple construction and easy operation. Efficiency of the induction motor is affected by its fixed losses and variable losses which mainly depend on the input supply voltage and load current respectively. An attempt is made to minimize the iron losses by using the permanent magnet ferrite. A new Three Phase Induction Motor Using Written Pole Technology is proposed in this paper in which stator consists of two three phase windings accommodated in the same stator core and rotor is used as squirrel cage rotor with ferrite material on its periphery. Shaft loads are categorized as low, medium and high, Stator coils are energized through a controller based on the load demand. In this study, it is suggested to operate the machine with flat efficiency characteristics, irrespective of shaft load. When compared to conventional induction motor, the motor efficiency and power factor are improved. Another approach of this machine is that the ferrite layer on the rotor periphery will reduce the motor losses which results in improving the motor efficiency. In this motor, one windings (main winding) is designed for the 238 volt ac voltage while the second winding (exciter winding) is designed for 8 volt high frequency ac voltage. Experimental result ensures the considerable increase in the efficiency and power factor. The aim of this paper is to analyze and simulate performance of a 1Hp three phase induction motor using written pole technology using the well known Park’s transformation. A three phase squirrel cage machine is reconfigured and modeled into a two three phase stator winding accommodate in same stator core of the same volume as the three phase machine. Different tests are carried out on the novel machine to determine machine parameters. Simulation results, that predicts the dynamic performance of the machine using ANSYS, at start up are presented and discussed.
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Improving Distribution System Performance in Deregulated Electricity Industry Using Phase-Constrained Billing Scheme
1. IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 12, Issue 2 Ver. I (Mar. – Apr. 2017), PP 80-87
www.iosrjournals.org
DOI: 10.9790/1676-1202018087 www.iosrjournals.org 80 | Page
Improving Distribution System Performance in Deregulated
Electricity Industry Using Phase-Constrained Billing Scheme
Damian O. Dike, George E. Ogu, N. Chukwuchekwa and Blessing C. Dike
(Electrical and Electronic Engineering Department, School of Engineering and Engineering Technology,
Federal University of Technology, Owerri (FUTO), Nigeria)
Abstract: In many developing countries, domestic electricity consumers having single phase appliances are
most times supplied with single phase meters with incoming three phase supply lines. Due to frequent phase
faults, these customers often change their supply from one phase to another whenever there is low voltage or no
supply in the phase they are currently connected to. This action coupled with the fact that there is uneven
distribution of loads on the distribution transformers in residential areas, lead to more transformer overload
with consequential loss of power, equipment, man-hours, revenue and in extreme cases, life. When electricity
was treated as a welfare commodity or as part of government social responsibility, these consequences where
ignored. But with commercialization, privatization and deregulation, cost minimization and profit maximization
have become the watchwords. As a means of minimizing this, utilizing the concept of phase-constrained
electricity billing scheme in the deregulated Nigerian Power Industry was presented in this work. The phase-
constrained billing model involves re-arranging the service lines and setting up constraint matrices to relate the
phase and service lines utilizable by customer to the electricity bill using penalty factors. To test the
acceptability of this model, a customer behavior and utilization index based questionnaires were administered
in the field. The survey was analyzed using the statistical attitude measurement technique based on the 5-point
Likert Scale. The responses obtained showed that introducing a penalty factor in the billing which ensure that
those using more phases pay higher will minimize frequent change of phases; and provide a direction for
utilities and customers in resolving the power quality and availability problems associated with frequent phase
changing.
Keywords: Cost minimization, Deregulation, Penalty factor, Phase constrained, Profit maximization
I. Introduction
Residential electricity consumers use single phase appliances which require single phase meters with
only incoming single phase (i.e. one phase and neutral lines). In developed countries there is regular supply of
stable electricity with balanced load distribution. In purely residential estate, just a pair of cables can supply a
whole street from an 11:0.415kV neighborhood transformer and electricity retail companies are available at
short notices attending to the consumers. In this wise, the end-users have no need to touch their electricity
supply terminals, thereby saving cost.
Unfortunately this is not the case in Nigeria and most other developing countries. Due to frequent
outages and irregular supply of electricity in these countries arising from multifarious reasons including phase
faults, customers often change their supplies from one phase to another whenever there is low voltage or no
supply in the phase they are currently connected to. This action coupled with the fact that there is uneven
distribution of loads on the distribution transformers in residential areas, lead to more transformer overload with
consequential loss of power, with its commensurate dire consequences. When electricity was treated as a
welfare commodity or as part of government social responsibility, these aftermaths where ignored. But with
recent changes in ownership and management of power utilities in these countries from regulated and vertically
integrated systems to deregulated, unbundled, commercialization and privatized entities, profit maximization
has become the watchword.
In a bid to survive the stiff competition, firms who have paid dearly to purchase these utilities from
government with much technical know-how, have to introduce electricity billing systems (Meters) with every
factor that adds to cost of operation included. Electric energy meter is the direct billing interface between utility
grid and consumers; and has undergone several advancements in the last decade. In Nigeria, electricity billing
commenced from the initial use of post-paid meters. In post-paid system, there is no controlled use of electricity
from the consumer’s side. Power wastage on the consumer’s side is high, due to lack of efficient planning of
electrical consumption. Meter readers go from house to house to check consumer energy usage after which bills
are prepared. Hence, the post- paid system is characterized by inconsistent billing arising from high billing error
estimates. An inconsistent billing system leads to constant complaints by consumers, low consumer satisfaction,
and hence poor public perception of service providers. The aftermaths of these are uncontrolled loss of revenue.
2. Improving Distribution System Performance in Deregulated Electricity Industry Using Phase-..
DOI: 10.9790/1676-1202018087 www.iosrjournals.org 81 | Page
The problems of unstable, inadequate and unreliable power supply in Nigeria has been linked to the
power sector’s inability to generate enough revenue to cover its operating costs let alone its huge capital
expenditure requirements [1]. At the heart of this problem lies the method employed in service drop to
residential buildings in Nigeria. A utility-approved single phase or a three phase service drop is normally wired
to residential buildings according to the types and capacities of loads intended to be powered, with the
applicable billing meter (single phase or three phase meter) wired in. But overtime, experience shows that this is
no longer the norm, as today almost all residential buildings are serviced by three phase drop, with or without a
single phase meter. A three phase meter is rarely installed by residential buildings. Now if a fuse of a powered
substation transformer suddenly trips for any other reason such as phase overload, earth fault, line fault, etc. the
residential consumers connected to that phase quickly and in a frenzied manner change or transfer their phases
to the next available phase, from their own installed three-phase service fuse cut-out ports. Due to current surge
on that very phase, the line fuse located in the feeder pillar soon trips to clear that feeder. Next all consumers
transfer their loads to the next available phase. The feeder fuse then trips in a shorter time. This consumer
attitude continues until all feeders’ fuses go out and a total area blackout results. The results of the frequent and
cyclical phase changing by residential consumers are: frequent distribution transformer and phase/feeder fuses
breakdown, unreliability and unavailability of supply (brown-outs, black-outs), unnecessary revenue and man-
hour losses, frequent intervention calls by consumers, disputes over bill payments, service disconnection and
reconnection problems by utilities, etc., which eventually portrays the utilities in bad light.
Cost recovery simply means recouping what was invested in providing services. Cost recovery is
closely related to tariff. Tariffs imply payments made by electricity consumers. They are streams of revenue
from the users that would enable investment cost to be recovered [2]. Tariff in the power sector may be defined
as the aggregate price paid by the final consumer of electricity. Tariff collection enables the provider of
electricity whether public or private investor to recover costs of energy consumed. Obviously the public sector
finances invested in electricity supply are provided from tax payers’ money and other sources of Government
revenue. To ensure continued supply of the service and long-term sustainability, there is the need to recover all
costs associated with the power service.
Presently, there has been an increasing desire to install digital pre-paid meters to bill consumers
according to their consumption. It automates the meter reading, carries out prepaid recharging function and
enables the exchange of consumed data information between the grid and consumer. Details of customer
consumption information sent by the prepaid energy meter may be stored in the grid computer for future
verification [3]. Electricity supply disconnection is achieved when the preloaded credit is exhausted.
Electricity billing system, in residential applications could be realized with either of single phase or
three phase energy pre-paid meters. Considering that over 60% of utilities customers fall within the residential
R2 class which significantly affects the revenue collection of utilities companies, effective, accurate and reliable
means of collecting it must be followed. The electricity energy meter and system of billing is very critical to
cost recovery and sustainability of service in terms of quality, convenience and continuity of service. In this 21st
century, electric utility management, public utility regulators and energy consumers have realized the need to
have an economical and effective way of achieving satisfactory reliability levels of electric service. To realize
this objective, a system must be engineered to provide the type of reliability needed at the lowest possible cost
[4-5]. It is easy to invest in distribution capacity, but recouping that which was invested is of paramount
importance as every business was started in the first place for profit, which in turn is re-invested for further
capacity expansion. Hence the mode and manner of billing electric energy consumers is at the heart of failure or
success of power distribution companies.
Various research works have gone into improving the power system in terms of management, billing,
tariff plans and so on. Some of these include, the application of a new Multi-Year Tariff Order to improve
revenue generation [1], the design and introduction of Power Billing System (PBS) with online capabilities for
better administrative purposes [6], and the development of microcontroller based automatic trip control system
for energy management using GSM wireless technology [7]. Research activities have also gone into the
development of automated energy metering systems capable of remotely monitoring and controlling the
distribution company’s database [8]. The effect of voltage unbalance on the operation and performance of three
phase distribution transformer has also been investigated [9]. Questionnaire-based surveys have been carried out
to evaluate electricity supply, state of billing meters [10], as well as establishment of factors that contribute to
the convenience offered by the prepaid billing system as opposed to the post-paid system [11]. In this work,
reference was made to relevant rates and billing categories in [12-13].
This research therefore seeks to establish that a billing system that is phase-constrained will make for a reliable
and available electricity supply that would eliminate the trouble of panic phase-changing by electricity
consumers.
3. Improving Distribution System Performance in Deregulated Electricity Industry Using Phase-..
DOI: 10.9790/1676-1202018087 www.iosrjournals.org 82 | Page
II. Concept of and Need for Phase-Constrained Billing
(A) What is Phase-Constrained Billing: This an electricity billing system that utilizes penalty factor(s) to
account for the use of more phases than that designated for the customer assigned electricity meter. This arises
due to the fact that a customer wants some degree of freedom to move to another power supply phase in the
event that the assigned phase has no available supply or has poor power quality. It gives the customer some
degree of redundancy above other users with same grade of metering device.
It is desired to model a phase constrained billing system that generates electricity bills for consumers
based on the number of phases they bring into their residences. We foresee that such a system could improve the
availability, reliability and possibly the lifespan of the neighbourhood distribution substation transformer by
systematic manipulation of customer behaviour through the service line connections and billing. Fused links
depict the power flow path to the billing meter.
Fig. 1 illustrates the phase-constrained billing scheme. The topmost is the normal supply for single
phase meter having just two lines. There is no option for a customer to change phase thereby exhibiting zero
degree of freedom. The next has two phases connected to a single metering device showing one degree of
freedom, and three phases connected to a single phase meter follows indicating two degrees of freedom for the
customer. Finally, the lowest shows three phase supply to three phase meter which is normal for industrial or
three phase equipment. It is constrained in the sense that no customer will have more than one phase (two
supply lines) incoming for single phase meter, except with formal application and approval from the supplying
utility. When approved, the customer pays for it by the introduction of a penalty factor in the tariff computation.
Also, it is accommodated in the nearby distributions transforms’ phase load allocation. The penalty factor
increases as the degree of freedom granted the customer and the cost of providing redundancy in the distribution
transformer load allocation.
Figure 1: Phase-constrained billing scheme
(B) Need for Phase-Constrained Billing System
Unfortunately in Nigeria and most other developing countries, due to frequent outages and irregular
supply of electricity arising from multifarious reasons including phase faults, customers usually pay higher fees
to ensure that they have all three phases incoming (i.e. 4 wire supply) to their homes despite the fact that their
electricity meters and appliances are single phase. A common scenario is that when there is supply in all three
phases, the tendency is high that most homes connect to phase “A” leaving “B” and “C” phases. When phase the
voltage in phase “A” drops, the whole neighbourhood will move to the next phase “B” leaving phase “C”. If
supply in phase “B” is lost, everyone reverts to the remaining phase “C”.
4. Improving Distribution System Performance in Deregulated Electricity Industry Using Phase-..
DOI: 10.9790/1676-1202018087 www.iosrjournals.org 83 | Page
Worst cases arise at the instant when the normal supply is seen; most households usually connect to
phase “A” since that is the 1st
phase before trying other phases. Due to the fact that no one is really sure of how
low the power will stay, they rush to switch on inductive loads like water pumping machines and refrigerators.
The attendant surge leads to overloading of the distribution transformers, particularly in this era of deregulation
where the privately owned distribution companies load the system very close to limit to maximize profit.
Considering the fact that distribution (service) transformers are designed to have maximum efficiency at lower
loads, the overloading leads to customers residing close to transformer site having high voltages/low currents
while those customers residing farther will experience low voltages/high currents [14 - 15].
From the foregoing, it may be stated that the consequence of unregulated, unplanned, unrecorded and
very frequent change of phases by electricity end-users is transformer overload which are short and unplanned.
Power transformer is one of the most important and expensive components in electric grid [16 -17], and
therefore its performance affect the whole system. Whenever a power transformer is overloaded beyond its
nameplate rating, there are risk and consequences as aptly captured in [14 – 19]:
(i) Accelerated aging: This is one of the main consequences of overloading a power transformer; and it leads
to increase in operating temperature which influences transformer aging failure.
(ii) Burning winding insulation leading to complete transformer failure: The higher the loading the higher the
generated heat which leads to burning of the winding insulation.
(iii) Severe loss of insulation life due to bubble and gas formation in the oil if the overloading last more than 30
minutes (the allowed short time overload according to IEC standard) [19].
(iv) Reduction of dielectric strength of the transformer insulating material due to gas bubbling from the
insulating conductors and adjacent metallic structural materials.
(v) Reduction of transformer short circuit strength due to temporary deterioration of its mechanical properties
at high temperature.
(vi) Increase in voltage regulation through the transformer due to increase apparent power loading and possibly
dropping of power factor.
(vii)Expansion of oil due to increased top oil temperature rising above the standard limit.
(viii) Leaking of gaskets, loss of oil and extreme dielectric failure resulting from increased pressure in
bushing.
Overall, due to these frequent changes of phases and attendant service transformer overloading with its
dire consequences as outline above, there is more power outages because transformer life span in Nigeria is far
below its expected normal life span of thirty years [14] in developed countries. In order to avoid the huge loss of
materials, man-hours, revenue and in very extreme cases life, there is need to introduce constrained phase billing
in Nigerian electricity tariff structure since it may cost more to pull out the extra incoming phases in single
phase metered residential buildings. This will enable utilities to plan and accommodate all possible phase
changes and appropriately balance the loads.
III. Modelling of Phase-Constrained Billing
From first principle, the exponential forms of energy consumed, and the basic energy consumption cost,
for a composite load is respectively written as:
(1)
(2)
By combining some of the cost parameters defined in Table I as stipulated by electricity market regulators and
decomposing the complex exponential operator using Euler’s theorem, the electricity cost model (BILL) for the
phase-constrained billing scheme (3) is obtained:
(3)
Applicable parameters, symbols, dimensions and limits employed in the billing scheme are defined in Table I.
The mean values are computed using (4) and (5):
(4)
(5)
Where: i: rank of scale from 1 to 5; Xi: weight of respondent’s answer choice; : weighted mean for a Likert
item; : Mean Average for a given group of hypothesis; : response count or frequency; N: frequency/count.
5. Improving Distribution System Performance in Deregulated Electricity Industry Using Phase-..
DOI: 10.9790/1676-1202018087 www.iosrjournals.org 84 | Page
Table I: Nomenclature for phase-constrained electricity billing scheme
IV. Implementation
Since it is thought that having more than one phase of electric supply to residential buildings
significantly contributes to overloading of distribution transformer, resulting from frequent phase-changing; it is
then necessary to sample customers’ attitude, awareness and satisfaction in a bid to seek for ways of introducing
customer-side load management using the concept of phase-constrained billing system.
Analysis of respondents’ data was completed as follows:
(i) A total of 300 structured questionnaires (Appendix 1) was prepared and distributed to respondents (or
customers) within the location of transformer substations.
(ii) Frequency Distribution Table was prepared from the returned respondent(s) data, and analysed using
descriptive statistics.
(iii) Questionnaires were analysed based on the weighted mean in (4), as a measure of central tendency to assess
the degree of influence of each factor (Appendix 2).
The Mean Base Table, based on the 5-point Likert scale [20] was adopted as the method of respondent data
analysis [21], with scales defined as follows:
Strongly Agree (SA): 5; Agree (A): 4; Neutral (N): 3; Disagree (D): 2; and Strongly Disagree (SD): 1.
V. Results and Discussion
The field survey carried out had respondents of at least thirty years, self – employed, civil servants or
employees of private companies. Three hundred questionnaires were distributed; with two hundred and eighteen
returned comprising of one hundred and twenty eight males and ninety females respectively responding,
yielding a total response rate of 72.7%.
The following results were obtained by statistical evaluation of the mean based on Appendix 2 Table.
i. Group A: Frequent phase changing attitude by respondents creates feeder unbalance.
The group average mean integer value of 3 (actual = 3.26), signifies that respondents were largely
indifferent to this concept. Hence they remained neutral (N) in A1, A2, A3, A7 and A8. Respondents
disagree (D) in A4, rejecting increased bill for bringing in or retaining multiple electric service lines. They
also disagree (D) in A6 that “phase changing is the right action to perform”. However, respondents agree
(A) in A5 implying that if the 1-electric service line they bring into their residence is stable and ‘cheaper’, it
would be preferred to having or retaining multiple lines.
ii. Group B: Phase constrained electricity supply will reduce phase unbalance problems and increase
availability and reliability.
Group average mean integer value of 4 (actual = 4.20) implies that consumers agree that phase constrained
supply could mitigate substation problems brought about by consumers’ actions. Hence they agree (A) in
B9, B10, B11 and B12.
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iii. Group C: Utilities’ attitude (slow response and inconsistent billing) encourages sharp practices.
A group average mean integer value of 3 (actual = 3.33) implies neutrality (N) of consumers to this
hypothesis. Respondents agree in C13 that lack of prompt response by utilities workers encourage sharp
practices, but disagree (D) in C14 and C16 signifying that electricity bill is still a grey area. Respondents
remain neutral (N) in C15 despite that a greater percentage (37.6%) disagrees, as they have to pay their bills
all the same.
iv. Group D: Unenforced or absence of applicable legislation(s) contributes to phase imbalance.
Being a policy matter, a group average mean integer value of 3 (actual= 3.71) shows that respondents are
largely neutral (N) or indifferent to this hypothesis. The Likert scale weighted mean of D17 is neutral (N)
despite that 38% of respondents strongly agree (SA). Respondents disagree (D) in D18 implying that it is
better to call utility workers for intervention.
However, respondents agree (A) in D19 and D20 that tampering with electricity installations must be
seriously addressed.
V. Conclusion
The paper presented phase-constrained electricity billing system in the computation of electricity tariff
in deregulated electricity markets as a means of improving distribution system performance. The authors were
of the view that the electricity distribution system in Nigeria and other developing countries where there exist
more than one phase incoming for a single phase electricity meter gave room to frequent, unguided and
unplanned jumping from one phase to another by electricity consumers leads to service transformer overload.
It went further to x-ray the dire consequences of prolonged overloading of distribution transformers
which overall lead to their shorter life spans with attendant frequent power outages. Considering the important
role of power transformers in the electricity grid and its cost, the authors deemed it fit that imposing a penalty on
customers who use more that required phase for improved degree of freedom or redundancy will go a look way
to reduce the number of customers who engage in such act. Furthermore, any possible change of phase would
have been provided for in the load planning. The proposed model was validated using results realized from
statistical evaluation of customer behavior and utilization index based questionnaire responses obtained from a
field survey. Analysis is the questionnaire that the willingness of electricity consumers of various shades
accepting the models if incorporated in the Nigerian Electricity tariff. Application of model could help
Regulatory bodies and related authorities implement a fair utilization based electricity metering and billing
system.
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Appendix
Appendix 1: Survey Questionnaires
Appendix 2: Questionnaire Analyses (Mean Base Table)
Group A: Research Hypothesis 1 – 8
8. Improving Distribution System Performance in Deregulated Electricity Industry Using Phase-..
DOI: 10.9790/1676-1202018087 www.iosrjournals.org 87 | Page
Group B: Research Hypothesis 9 – 12
Group C: Research Hypothesis 13 – 16
Group D: Research Hypothesis 17 – 20