Available Fault Current Calculation (Isc Calculation):

1) Calculate Short Circuit Current at Substation


- Generator kW:
- Type of Supply
- Voltage Line-Line (V L-L)
- Voltage Line-Neutral (V L-N)
- Enter Generator Subtransient (Z)
- Power Factor
- No of Generator in Parallel
- Total Generator kva:
- Secondary Current ( I L-L)

- Secondary Current ( I L-N)
- Maximum Generator Short Circuit Current( Line-Line)
- Maximum Generator Short Circuit Current( Line-Neutral)
- Do You Have any Motor Contributions
- Motor Contributions (Line-Line)
- Motor Contributions (Line-Neutral)


- Total Short Circuit Current:( ISC Gen)(L-L)
- Total Short Circuit Current:( ISC Gen)(L-N)

2) Calculate Short Circuit Current at Distribution point

3) Calculate Short Circuit Current at Transformer

4) Calculate Short Circuit Current at Main Panel

5) Calculate Short Circuit Current at Sub Distribution Board

Software:Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc)
Version:22.8.2012 New
Developer:Jignesh Parmar
Size:85 Kb
Download:Right here | Get Download Updates | Get Technical articles

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

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Page edited by E.C. (Google).


  1. 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

  2. KUMAR
    Dec 03, 2013

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

  3. [...] Difference between Phase = 360/ No of Phase (1 Phase=230/1=360°, 2 Phase=360/2=180°)Short Circuit Level of Cable in KA (Isc) = (0.094 x Cable Dia in Sq.mm) /√ Short Circuit Time (Sec)Max.Cross Section [...]

  4. 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: faruqueahmad39@gmail.com

    Best regards,

    Mar 21, 2013

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

    • 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,

  6. [...] elements that still remain in the path between the power source and the short circuit point.Short circuit calculations are used to determine how much current can flow at certain points in the electrical system so that [...]

  7. [...] carried out to find the magnitude of fault current at various voltage levels of electrical system.Short circuit calculations are actually just an elaborate version of Ohm’s Law. One of the key components in the calculation [...]

  8. Allen
    Jan 05, 2013

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

    • 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.

  9. 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: tosin.fayinminu@deltaafrik.com or fayinminutosin@yahoo.com.

    • 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%).

  10. jbuda54
    Jan 03, 2012

    Do you have an AWG cable size equivalent excel file?

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