Transformer fault current calculator

[linemanager]

Transformer fault current calculator

I’m looking for a fault calculator to download (buy) to calculate standard utility transformers such as 667KVA 7200/12470- 277 V 3%Z transformers single or three phase
Any info would be welcomed

 

[mpparent]

You could setup a spreadsheet that calculates those quantities pretty quickly using the "infinite bus" method.

Mike

 

[rbulsara]

Assuming infinity bus, which you should for utility xfrms,
the formula can't get any simpler.

Max. SCC in amps for a xfmr =FLA/Z
where Z is in per unit. (3%=.03pu)

You can set up a spreadsheet for this calculation.

In fact it takes less time to calculate it on a calculator, then the time it takes to open a excel program on a PC!!

 

[ProtectionEngineer]

What is your e-mail address? I have the program written in Visual Basic. I can e-mail it to you.

Alex