# Fault Current Calculation

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## Introduction

This MS Excel Spreadsheet is created by mr. John Sokolik and it represents easy way to calculate fault current by entering few values in indicated fields.

You will find sheet with very nice example already fulfilled. Before starting fault current calculation, you will have to choose between Step 1a and Step 1b which are explained below.

### Step 1a

Insert available fault current ampere rating from your local Utility.

### Step 1b

Insert the the kVA rating power factor (PF) and impedance  (Z) of the transformer is not required to continue. Note: When you insert the kVA rating  power factor and impedance you must select the voltage from the dropdown box Select Voltage & Phase before the value will be calculated.

### Spreadsheet information

 Software: Fault Current Calculation (MS Excel Spreadsheet) Version: 7.1 Developer: John Sokolik Size: 207 KB Price: Free Download: Right here | Get Download Updates | Get Technical articles

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Page edited by E.C. (Google).

### 20 Comments

1. priyaranjan mohanty
Nov 06, 2015

Very nice and worth for learning!!

2. Michael Furtak
Aug 26, 2015

Comprehensive short circuit analysis factors in both active and reactive parts of equipment impedance and contributions from multiple sources including motors and generators. Consider free Short Circuit Analytic software program at http://arcadvisor.com/short-circuit-software for your short circuit fault current calculations needs.

3. Ricardo Reyes
Jul 28, 2015

Thank you very much, Interesting topics… Nevertheless, could you provide me a background for the medium voltage transformer ground fault system protection. In particular, design application and calculation of a right NGR for a Power Transformer, 12/14MVA, 13.8/4.16KV, delta-Y, 3ph, 60Hz.

4. David A Engelhart
Feb 16, 2015

I found an error in this calculator prior to this version when I learned how to calculate longhand. I also got John to add the Utility Fault Current cell that is present in this version. This file is also available at MikeHolt.com in his free stuff where I got my copy to critique. The Electrical Plan Review PDF file is what taught me to calculate fault current by longhand. http://www.mikeholt.com/technical-calculations-formulas.php

• Mahendra Mistry
Mar 19, 2015

David
Can you provide information with examples on how to calculate fault levels the long hand method. Thanks.

5. walter graham
Jan 26, 2015

this is a very good website!

6. .
I work with Electricity Authority of Cyprus and i am the section head of High voltage cables.
I really enjoy reading your articles. They are very good and very helpful.
I am using your spread sheets for various calculations.
Thank you

7. gaitan
Nov 23, 2013

Great work!!

8. S.M.Nazraton Nayeem
Nov 22, 2013

It’s a great work….

9. Padlock01
Jul 15, 2013

Just a comment on available software please remember that especially on the african continent
we use mm2 conductors as apposed to AWG so it would be nice to select either.

10. mosesma
Nov 29, 2012

Thank you for the great work you have done.

11. matbon
Nov 07, 2012

Hi,
Very good work.
Yet could you make an option which allows you to input the cable data in mmsq and not in AWG (European Standards)?
Thanks in advance.

12. neel151
Sep 07, 2012

Thank you very much. It is great to have such kind of facility to able to speed up your calculations.

13. arun banerjee
Jun 26, 2012

Thanks a lot!
Such kind of excel sheets are definitely useful to crosscheck the calculations.

14. kalayil78
Mar 24, 2012

Hi ,
Excellent work,
But , can you pls update this with LV Earthing system (IT,TT,TN etc..) & Transformer windg method (Y,DYN,yn etccc). with out these the pgm is good enogh only for 3 phase fault which is not allways the design criteria of LV system.

Thanks in advance

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