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Anonymous Poster

Short to ground calculation

04/22/2008 2:39 PM

Do you know the math in order to calculate the voltage raise in the other phases of a delta-delta power transformer when a short to ground occurs ? . For example, in the secondary, one leg of a 440 VAC 3 phase shorts one phase to ground. What voltage I will see in the another 2 phases ?. Take note the the secondary is NOT grounded. Primary voltage is 23 KV.

Thanks in advance.

francisco Sanchez

Faraon34@hotmail.com
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North of 60
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#1

Re: Short to ground calculation

04/22/2008 3:52 PM

Sounds like another homework question to me... am I wrong?

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 Joe Contractor to Electrical Inspector, "What do you mean you are going to make me follow the code?".
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North of 60
Guru
Canada - Member - If there is a way to screw someting up, there is someone to do so! Safety - Hazmat - New Member

Join Date: Mar 2007
Location: Iqaluit, NU. Canada
Posts: 1854
Good Answers: 140
#2
In reply to #1

Re: Short to ground calculation

04/23/2008 7:41 AM

Here is a link where you can find the answer to your question. Time for some reading...

http://www.i-gard.com/pdf/application%20guides/HRG%20Application%20Guide.pdf

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 Joe Contractor to Electrical Inspector, "What do you mean you are going to make me follow the code?".
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Anonymous Poster
#3

Re: Short to ground calculation

04/29/2008 12:57 AM

guest. your phase to phase voltage would not change by grounding one phase. you could use single phase disconnects, that is fusible 2 pole switches with 1 phase grounded. and you would still have 3 phase power. perry
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