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Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)
Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)

1. Fault Current At Transformer

Inputs:

  • Transformer Kva
  • Secondary Voltage of Transformer (Line-Line)
  • Secondary Voltage of Transformer (Line-Neutral)
  • Transformer Impedance (Zt)
  • Transformer Secondary Full Load Current I (Line-Line)
  • Transformer Secondary Full Load Current I (Line-Neutral)

  • KVA Short Circuit At Primary Side
  • Source Impedance (Zu)
  • Total Impedance (Z =Zu+Zt)
  • Short Circuit Current RMS Symmetrical
  • Fault Current At Transformer Secondary ( Isc(L-L)=I (L-L)/Total Impedance)
  • Fault Current At Transformer Secondary ( Isc(L-N)=I (L-N)/Total Impedance)

2. Fault Current At Main Panel

Inputs:

  • Cable Length from Transformer to Main Panel
  • Type of Cable
  • No of Conductor/Phase
  • Size of Phase Conductor
  • Size of Neutral Conductor
  • Type of Race Way
  • Phase Conductor Constant (C1)

  • Neutral Conductor Constant (C2)
  • F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
  • F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
  • M1(L-L) [M=(1/(1+F1)]
  • M2(L-N) [M=(1/(1+F2)]
  • Fault Current at Main Panel Disconnection (L-L) [Isc X M1]
  • Fault Current at Main Panel Disconnection (L-N) [Isc X M2]

3. Fault Current At Sub Panel

Inputs:

  • Cable Length from Main Panel to Sub Panel
  • Type of Cable
  • No of Conductor/Phase
  • Size of Phase Conductor
  • Size of Neutral Conductor
  • Type of Race Way
  • Phase Conductor Constant (C1)

  • Neutral Conductor Constant (C2)
  • F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
  • F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
  • M1(L-L) [M=(1/(1+F1)]
  • M2(L-N) [M=(1/(1+F2)]
  • Fault Current at Sub Panel Disconnection (L-L) [Isc X M1]
  • Fault Current at Sub Panel Disconnection (L-N) [Isc X M2]

4. Fault Current At Distribution Board

Inputs:

  • Cable Length from Sub Panel to Distribution Board
  • Type of Cable
  • No of Conductor/Phase
  • Size of Phase Conductor
  • Size of Neutral Conductor
  • Type of Race Way
  • Phase Conductor Constant (C1)

  • Neutral Conductor Constant (C2)
  • F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]
  • F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]
  • M1(L-L) [M=(1/(1+F1)]
  • M2(L-N) [M=(1/(1+F2)]
  • Fault Current at Distribution Board Disconnection (L-L) [Isc X M1]
  • Fault Current at Distribution Board Disconnection (L-N) [Isc X M2]

Software:Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)
Version:
Developer:Jignesh Parmar
Size:85 Kb
Price:Free
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Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)
Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)

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39 Comments


  1. Pol Sanahuja
    Apr 20, 2020

    Is it possible that in the base MVA method tab there is an error in the calculation of fault current at Main LT Panel?

    I think that there is an error because the impedance of the transformer is not added to the impedance used for the calculation and I’m getting results like 2 000 KA -> 2 000 000 A

    Please confirm

    PD.: Can I have the password to modify the spreadsheets?


  2. Romell Bojie Belleza
    Apr 15, 2020

    Good day Edward could you pls send me a copy of short ckt current calculation at various point of electrical circuits in excel..thank you


  3. Felipe Rengifo
    Apr 15, 2020

    Un saludo


  4. Abir Hasan
    Apr 14, 2020

    please send me
    [email protected]
    regards


  5. Chris Dodds
    Sep 09, 2019

    All: Where the system peak fault current and the cable diameter are known, the formula featured in the below Article, excerpted from the international standard IEC 61914, can be used to calculate the forces between two conductors in the event of a 3 phase fault in order to specify the correct type of cable cleats.

    IEC 61914 – Cable Cleats & Short Circuit Protection Calculations
    https://www.powerandcables.com/iec-61914-cable-cleats-short-circuit-protection/

    Chris Dodds
    Thorne & Derrick http://www.powerandcables.com


  6. Ayo Muritala
    Jul 14, 2019

    Hello sir,
    I actually performed some physical tests on Power Transformers but I’m interested in the digital aspect and how I can deploy the use of algorithm. Also that I want to simulate the practical result onto the simulation model. I would need assistance on how to apply my result on the simulation platform.
    I crave your indulgence to assist me to gain the knowledge.
    I wish to send you the test results. My mail address is [email protected]
    Thanks in anticipation.
    Regards.


  7. Tunde Alabi
    Jul 09, 2019

    Good day sir, please with winding test, ratio test and excitation test on transformer
    how can I know the capacity of a transformer (KVA) without looking at the name plate.


  8. Dennis ventura
    Feb 10, 2019

    Hi Sir Edvard can you also send this to my email [email protected] Thank you very much.


  9. kiir tong deng
    Jul 31, 2018

    I need to join EEP memberships network ,for engineering purpose to upgrade my career as power engineer .


  10. ANDRÉS ELÍAS PÉREZ LAGUNA
    Jun 23, 2018

    Buenos días Ing. Edvard cordial saludo, quisiera saber cuando abra una hoja de cálculo de las que ofrecen en forma gratuita, por qué me pide contraseña y si trato de buscarla me dice que debo pagar.
    Cómo desbloqueola hoja en Excel para poder trabajar.

    Ejemplo la hoja de Nivel de Cortocircuito?
    Quedo atento a su respuesta
    Feliz día


  11. VIJAYARAGHAVAN PONNAIYA
    Oct 20, 2017

    sir
    kindly let me know the cable size calculation complete formula and explain how to use that formula .Even i want to know the various design aspects of electrical design of cable size ,cable selection,


  12. Josh Shelton
    Dec 01, 2016

    Very handy tool. Would like to see the cables listed in AWG size also and standard measurements compared to metrics. I am an American, we are different, haha!


  13. Edson Viana from Brazil
    Nov 11, 2016

    Hi Edvard, good afternoom

    Please, do you have a sheet plan to short circuit in CC?

    Best regards.

    Edson


  14. Rohit krishnan
    Aug 31, 2016

    Hey edward could you please send me a copy of the short circuit calculator xls. Your help would be very much appreciated. Thank You .


  15. Bilal mohamed
    Aug 15, 2016

    Dear sir
    i have three question

    1-could i know the formula you used from which standard or code you take it ?
    2- for Phase Conductor Constant , can you send me the catalogs which took from (because it different from country to other ) ?
    3- Do you have an AWG cable size equivalent ? (whith mention your resource )

    best regards


  16. Senthilnathan
    Mar 23, 2016

    Sir,
    Kindly send the excel tool for SC calculation as I am unable to download. My id: [email protected].. Thanks in advance..


  17. Murugadoss
    Oct 17, 2015

    Dear Edvard,
    Request you to send me a copy of the excel file for Short CKT Calcs as I am unable to download from the link.
    My mail id: [email protected]
    Thanks & Regards,
    Murugadoss


  18. Michael
    Aug 31, 2015

    you may also consider Short Circuit Analytic software program and mobile apps for short circuit fault current calculations. The program factors in both active and reactive parts of equipment impedance and takes into account fault current contributions from multiples sources including motors and generators:

    http://arcadvisor.com/short-circuit-software


  19. srikanth
    Jul 25, 2015

    sir
    kindly let me know the cable size calculation complete formula and explain how to use that formula .Even i want to know the various design aspects of electrical design of cable size ,cable selection,circuit breaker calculation,trays,etc.
    as im new and working in construction field.kindly help me out


  20. Chris Dodds
    May 28, 2014

    IEC 61914 covers the electrical engineering calculation for the correct selection and specification of cable cleats to retain power cables in the event of a short-circuit http://www.cablejoints.co.uk/blog/article/iec61914-cable-cleats-ellis-patents


  21. KUMAR
    Dec 03, 2013

    its not setisfied i need full calculation of short ckt current….


  22. Faruque Ahmad
    Aug 18, 2013

    Thank you for your support.

    Can you please send me a format for calculating Isc for a panel fed from generator. (e.g. 2.75MVA CAT Genset feeds to a Panel of 4000A, 415V, 4C armored cables).

    Or please advice to: [email protected]

    Best regards,


  23. MILIND TAMBAT
    Mar 21, 2013

    I am not able to free down load free EL. ENG. Technical articles.
    Can you please advice
    Thanks

    • Edvard
      Edvard
      Mar 21, 2013

      As a registered member (and you are), normally you should see download link ‘Right here’.

      If you have problem with downloading, please send me email on office at electrical-engineering-portal dot com

      Best regards,
      Edvard


  24. Allen
    Jan 05, 2013

    Could you please develop the Excel calculation sheet for sizing of Soft Starter with the curve appearance.

    • Edvard
      Edvard
      Jan 05, 2013

      EEP is not the developer of any MS Excel Spreadsheet here. All spreadsheets are developed by engineers who wanted to share their entusiasm and knowledge with everybody.


  25. fayinminu tosin
    Feb 01, 2012

    Hello, could you please solve the short circuit problem manually using point to point calculation. A better explanation on how you arrived at your answer would also be appreciated. Kindly send your reply to: [email protected] or [email protected].

    • One 480V motor feeder, 100HP, 100m length, for both underground installation and offshore installation in cable trays. Assume MCC is fed from switchgear, on the secondary of a 750kVA transformer, 4160-480V. The check for Voltage drop should be for running and starting conditions
    • One feeder cable to a Power Panel, 480V, 100kVA, 200 m distance
    • One 250 HP, 4.16kV motor, 100m length for both underground and cable tray installation. Assume 4.16kV MCC is fed from 4.16kV switchgear having a short circuit rating of 200MVA, the feeder length is 50Ft.
    • One remote 4.16kV-480V transformer feeder, 200m length, 500kVA.
    • One line diagram for the system (4.16kV and 480V) shall also be prepared.
    • Primary short circuit calculation (using reactance and resistances in ohms, not p.u.)
    • Assume the generation is with 2+1 1250kVA, 4.16 kV Solar Saturn 20 gas turbine generators (sub transient reactance is 12.5%).


  26. jbuda54
    Jan 03, 2012

    Do you have an AWG cable size equivalent excel file?

  27. Edvard
    Edvard
    Dec 15, 2011

    I have sent you all an email with this tool. Hope it will help!

    Cheers


  28. GP
    Dec 14, 2011

    Please can you forward Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc) excel sheet to me on my email address- [email protected]

    Thanks


  29. Simon
    Dec 14, 2011

    Hi Edvard,

    Nice work, can you send me on a copy of the excel tool please? I’m having difficulty downloading it too. Thanks.
    Simon.


  30. Sairaj
    Dec 07, 2011

    Sir,
    Kindly send the excel tool for SC calculation as I am unable to download. My id: [email protected].. Thanks in advance..


  31. RamaRaju
    Dec 06, 2011

    Dear Edvard,
    Request you to send me a copy of the excel file for Short CKT Calcs as I am unable to download from the link.
    My mail id: [email protected]
    Thanks & Regards,
    Raju


  32. Marcus
    Dec 04, 2011

    Dear Sir, will you be able to send me a copy of the excel file? I am having trouble downloading it too. thanks heaps for your great work. [email protected]


  33. Brkn
    Dec 02, 2011

    Dear Edvard,
    Can you send to my e.mail too.
    My e.mail is: [email protected]
    Thanks.


  34. S P Gupta
    Nov 29, 2011

    Please send the software for calculation of short circuit as it is not getting down-loaded. Thanks

    • Edvard
      Edvard
      Nov 29, 2011

      I just checked and MS Excel tool is working very well, it’s downloadable. However, it’s my pleasure to se send it to you!

      Check your email!

      BR


  35. ahmadgce04
    Nov 28, 2011

    sir, this short ckt. sheet is not getting downloaded on my system due to some network problem.so please send the Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc) excel sheet me on my email address- [email protected]. i will be very much thankfull for your kind support.

    • Edvard
      Edvard
      Nov 28, 2011

      No problem at all Ahmadgce04! I just sent you above mentioned XLS tool on your email.

      BR

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