Fault current calculation for 22/0.4kV 2000kVA transformer, 6% Z, 0.0005+j0.0012Ω cable

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#1 21680372 30 Jul 2018 18:55

Evan D Evan D

Anonymous

Post #1
21680372 30 Jul 2018 18:55

I encountered below question and need help:A main switch board is supplied from a 22/0.4 kV, 2,000 kVA transformer with an impedance of 6%. The impedance of LV cables to the main switchboard is 0.0005+j0.0012 Ω. The fault level at the intake point at 22 kV is 1,000 MVA, calculate the fault current at main switch board.
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#2 21680373 03 Aug 2018 03:52

Elizabeth Simon Elizabeth Simon

Anonymous

Post #2
21680373 03 Aug 2018 03:52

Evan,As you may have guessed from the lack of response, this is a question that we don't know how to answer (it's way out of my range for sure). I hope the following sites will help you to get your answer.

http://arcadvisor.com/faq/mva-method-short-circuit-fault-current-calculations

https://www.ecmweb.com/design/short-circuit-fault-calculations
#3 21680374 03 Aug 2018 20:30

Max Maxfield Max Maxfield

Anonymous

Post #3
21680374 03 Aug 2018 20:30

Hi Evan -- Elizabeth is correct -- I've been trying to find someone who can answer this, but no luck so far.Hey -- when you do find the answer, please post it here so we can all learn from it
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Fault current calculation for 22/0.4kV 2000kVA transformer, 6% Z, 0.0005+j0.0012Ω cable

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