This document discusses cable sizing calculations and techniques. It explains that proper cable sizing is important to ensure efficient, safe and economic transmission of electrical energy without interruptions or exceeding the cable's limits. The document outlines the common steps for cable sizing: 1) gathering data on the cable, load and installation conditions, 2) determining the minimum size based on current capacity, voltage drop, temperature rise and fault impedance, and 3) selecting the optimally sized cable. Several examples are provided to illustrate implementing the cable selection process. Risks of improper sizing like voltage drops, overheating and shorter lifespan are also summarized.
Principles of Cable Sizing; current carrying capacity, voltage drop, short circuit.
Cables are often the last component considered during system design even if in many situations cables are the true system’s lifeline: if a cable fails, the entire system may stop. Cable reliability is therefore extremely important, then a cable system should be engineered to last the life of the system in the installation environment for the required application. Environments in which cable systems are being used are often challenging, as extreme temperatures, chemicals, abrasion, and extensive flexing. These variables have a direct impact on the materials used for cable insulation and jacketing as well as the construction of the cable. Using a systematic approach will help ensure that designer select the best cable for the required application in the installation environment. This lessons will provide students main guidelines for perform this approach.
This Presentation is about l.v switch gear design, presented during the graduation project final discussion 15/7/2018.
It presented a good summary of switch gear components and types and practicing on AL.HAMOOL W.T.P M.D.B design using SIEMENS SIVACON S8
Dear All,
Here i glad to introduced with a basics of Design Electrical which is helpfull to understand the concept of electrical.
I hope you like these concept & prefered the same.
Thanks& Regards,
Pankaj V. Chavan
( 95615 73214 )
Since the loads having the trends towards growing density. This requires the better appearance, rugged construction, greater service reliability and increased safety. An underground cable essentially consists of one or more conductors covered with suitable insulation and surrounded by a protecting cover. The interference from external disturbances like storms, lightening, ice, trees etc. should be reduced to achieve trouble free service. The cables may be buried directly in the ground, or may be installed in ducts buried in the ground.
Principles of Cable Sizing; current carrying capacity, voltage drop, short circuit.
Cables are often the last component considered during system design even if in many situations cables are the true system’s lifeline: if a cable fails, the entire system may stop. Cable reliability is therefore extremely important, then a cable system should be engineered to last the life of the system in the installation environment for the required application. Environments in which cable systems are being used are often challenging, as extreme temperatures, chemicals, abrasion, and extensive flexing. These variables have a direct impact on the materials used for cable insulation and jacketing as well as the construction of the cable. Using a systematic approach will help ensure that designer select the best cable for the required application in the installation environment. This lessons will provide students main guidelines for perform this approach.
This Presentation is about l.v switch gear design, presented during the graduation project final discussion 15/7/2018.
It presented a good summary of switch gear components and types and practicing on AL.HAMOOL W.T.P M.D.B design using SIEMENS SIVACON S8
Dear All,
Here i glad to introduced with a basics of Design Electrical which is helpfull to understand the concept of electrical.
I hope you like these concept & prefered the same.
Thanks& Regards,
Pankaj V. Chavan
( 95615 73214 )
Since the loads having the trends towards growing density. This requires the better appearance, rugged construction, greater service reliability and increased safety. An underground cable essentially consists of one or more conductors covered with suitable insulation and surrounded by a protecting cover. The interference from external disturbances like storms, lightening, ice, trees etc. should be reduced to achieve trouble free service. The cables may be buried directly in the ground, or may be installed in ducts buried in the ground.
Cables are often the last component considered during system design even if in many situations cables are the true system’s lifeline: if a cable fails, the entire system may stop. Cable reliability is therefore extremely important, then a cable system should be engineered to last the life of the system in the installation environment for the required application. Environments in which cable systems are being used are often challenging, as extreme temperatures, chemicals, abrasion, and extensive flexing. These variables have a direct impact on the materials used for cable insulation and jacketing as well as the construction of the cable. Using a systematic approach will help ensure that designer select the best cable for the required application in the installation environment. This lessons will provide students main guidelines for perform this approach.
Power cable selection, cable selection Methodology wessam alaslmi
Cable installation and Selection Methodology according to IEC code supported with an example of how to do so.
Explain what practical environment requires when establishing a new facility requires electricity.
explain the purpose of the selected cable.
explain when to use the cable carrier types.
explain how to carry out calculations of such thing.
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Cables are often the last component considered during system design even if in many situations cables are the true system’s lifeline: if a cable fails, the entire system may stop. Cable reliability is therefore extremely important, then a cable system should be engineered to last the life of the system in the installation environment for the required application. Environments in which cable systems are being used are often challenging, as extreme temperatures, chemicals, abrasion, and extensive flexing. These variables have a direct impact on the materials used for cable insulation and jacketing as well as the construction of the cable. Using a systematic approach will help ensure that designer select the best cable for the required application in the installation environment. This lessons will provide students main guidelines for perform this approach.
Power cable selection, cable selection Methodology wessam alaslmi
Cable installation and Selection Methodology according to IEC code supported with an example of how to do so.
Explain what practical environment requires when establishing a new facility requires electricity.
explain the purpose of the selected cable.
explain when to use the cable carrier types.
explain how to carry out calculations of such thing.
Design of a generating substation with the description of designing a transformer. Here we show some basic components of a substation. and we also show the parameters and calculation to design a transformer of a specific ratings.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.t
This presentation, given by Georgia Power, discusses the importance of grounding and bonding. Real life examples are given and how they were handled as well as safety measures.
Your electrical safety specilist for all equipments Powered AC and DCMahesh Chandra Manav
We all are aware that we are applying lots of Artficial Sources to make our Life Comforts .
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To ensure better perform and Human Safety Earthing of Equipment and Conductive stucture is very important Value from 1 Ohms up to 0.25 Ohms.
Our National Building Code 2016 is alreday given Guide Line and Supporting by MBBL2019
(Manual Building By LAW).
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We have to Design and protect our Building or Permises form External Lightning by Nature use NBC IS/IEC 62305.
When Lightning Fall any Condutive Like Pole ,Transmission Line and React with Ground may be Shift 100kA Fault Current into our Building use Surge Protection Device to product from any ind of Direct and Indirect Threat.
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Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
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We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
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using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
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Collaborators and co editors: Charlie Sims and Connor Healey.
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source for obtaining much needed cooling water for a power
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developed using MATLAB. Governing equations based on
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NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...
Cable Sizing Calculations
1. CABLE SIZING CALCULATIONS
BY
SIDDHARTHA MUDGAL
ELECTRICAL ENGINEERING DEPARTMENT
MEERUT INSTITUTE OF ENGINEERING AND TECHNOLOGY,
MEERUT,UTTAR PRADESH
Dr. APJ ABDUL KALAM TECHNICAL UNIVERSITY(AKTU)
(Formerly known as UPTU)
2. What is Cable Sizing ?
The determination of conductor's parameters to get efficient, safe and economic
operation of transmission.
Importance of Cable Sizing
The proper sizing of an electrical cable(Which is bearing load) is important to
ensure that the cable can:
• Operate without any interruptions.
• Withstand the full load currents.
• Bear the voltage as well as transients .
• Minimize the initial capital investment.
• Provide effective and efficient transmission of electrical energy.
3. Major Solution providers for conductors in INDIA:-
• Havells India Ltd.
• Polycab Wires Pvt. Ltd.
• Sterlite Technologies Ltd.
• Finolex Cables Ltd.
• Diamond Power Infrastructure Ltd.
4. Techniqes of Cable Sizing:-
• Cable sizing methods do differ across international standards (e.g. IEC, NEC,
BS, etc) and some standards emphasise certain things over others. However
the general principles underlying any cable sizing calculation do not change.
As per IEC As per NEC
5. Common STEPS:-
• STEP 1:- Gathering the data about the cable, it's installation conditions and
the load which it needs to be supply.
• STEP 2:- Determine the minimum cable size based on the following:-
i)Current Carrying Capacity.
ii)Voltage Drop.
iii)Short circuit Temprature rise.
iv)Earth fault loop impedance.
• STEP 3:- Selection of the cable which have highest sizing based on the
above parameters
6. What we look for in STEP-1 ?
A)LOAD:-
• Type of load which is to be supplied.
• Maximum current required by the load.
• Voltage capacity of the system.
• Expected power factor of the system.
• Distance of load from the source.
B)CONTRUCTION OF CABLE:-
• CONDUCTOR MATERIAL:- Normally copper or aluminium.
• CONDCTOR TYPE:- Stranded or solid.
• CONDCUTOR SURFACE COATING:- Plain (no coating), tinned, silver or Ni.
• INSULATION TYPE:- PVC, XLPE, EPR.
• TYPE OF CORE:- Single core or multicore.
7. c)INSTALLATION CONDITIONS:-
• Installation medium:-
i)eg. Underground or overhead, soil thermal resistivity for underground cables,
etc.
• Arrangement:-
i)For underground cables whether it is placed directly or in a conduit, for
overhead wires whether it is installed supported by the walls, on the cable
towers etc.
ii)Depth of laying
iii)Bunching of cables, spacing b/w them.
• Atmospheric Temprature:-
i)Ambient of soil temprature.
ii)Soil thermal resistivity, in the case of undergrond cables.
8. What we look for in STEP-2 ?
A)Current carrying capacity:-
The current plays a vital role while deciding the sizing for a cable due to
following factors:-
i)Copper lossess.
ii)Thermal capacity of cable
iii)Reactive power.
iv)Insulation,bedding,armour and other components of cable
Thus depending upon these parameters we find out the minimum possible and
feasible size for the cable.
9. i)Base current ratings:-
Cable manufactuers maintains a table for base current rating for different type
of cables. These ratings are taken out in base environmental conditions and ths
these ratings are relevant for base installation conditions.
ii)Installed Current Rating:-
Whenever there is difference b/w the base conditions and actual instllation
conditions, then the derating factor is used in order to find out the actual
installed crrent ratings.
10. i) In ground Installation (Direct Burial)
C =Cs * Cg * Cd *Ct
Where, Cs = Rating factor for variation in ground temperature
Cg= Rating factor for Group of cables
Cd= Rating factor for Depth of laying
Ct=Rating for thermal resistivity
ii) Above Ground Installation
C = Ca * Cg
Where, Ca= Rating factor for variation in ambient air temperature
Cg= Rating factor for Grouping cables
Then installation current rating is obtained as:-
I(new) = I(base) * C
11. B)VOLTAGE DROP:-
Current flow through the cable – the higher the
current flow, the higher the voltage drop.
Impedance of the conductor – the larger the
impedance, the higher the voltage drop.
As, For a three phase system:-
For a single phase system:-
For a DC system:-
1000
)sincos(3
3
LXRI
V cc
1000
)sincos(2
1
LXRI
V cc
1000
2 LIR
V c
dc
12. C)SHORT CIRCUIT TEMPRATRUE RISE:-
During a short circuit, a high amount of current
can flow through a cable for a short time. This
surge in current flow causes a temperature
rise within the cable.
k
ti
A
2
k
ti
A
2
Minimum Cable Size Due to
Short Circuit Temperature
Rise:-
The temperature rise constant is calculated
based on the material properties of the
conductor and the initial and final conductor
temperatures
i
if
k
5.234
1ln226
i
if
k
228
1ln148
(for copper conductors)
(for aluminum conductors)
13. D)EARTH FAULT LOOP
IMPEDANCE:-
EARTH FAULT LOOP IMPEDANCE
Zs = Zc + Ze
Where Zs is the earth fault loop
impedance (Ω)
Zc is the impedance of the active
conductor (Ω)
Ze is the impedance of the earth
conductor (Ω)
22
1000
ececs XXRR
L
Z
14. Implementation examples of Cable Selection process
EXAMPLE 1
EXAMPLE 2
Electrical Details:- Electrical Load of 80KW, Distance between Source and Load is 200 Meter,
System Voltage 415V Three Phase, Power Factor is 0.8,Permissible Voltage drop is 5%,
Demand Factor is 1,
Cable Laying Detail:- Cable is directly buried in Ground in trench at the depth of 1 meter.
Ground Temperature is approximate 35 Deg. No of Cable per Trench is 1. No of Run of Cable is
1 Run.
Soil Details:- Thermal Resistivity of Soil is not known. Nature of Soil is Damp Soil
15. Risk and Impact of Wrong Sizing
• High voltage drops, which increases reactive power.
• Sudden increase in cable temprature.
• Damage of cable components, such as armour, bed sheath, insulation etc.
• Damage of protective components.
• Poor power factor.
• Non continuous supply.
• Shorter Life span of cables.
• Increase in maintainance cost of the system.
16. Conclusion
Efficient, safe and economic operation of transmission can be obtained by
proper sizing and selection of cables
References
Wikipedia,
https://wiki.openelectrical.org/index.php?title=Cable_Sizing_Calculation
Electrical Engineering Portal,
https://electrical-engineering-portal.com/an-example-how-to-calculate-voltage-drop-and-size-of-electrical-
cable
My Electrical Engineering
https://myelectrical.com
Elements Of Power System,by U.A.BAKSHI