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mzerighi
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Join Date: Oct 2009
Posts: 5

lossing phase

10/25/2009 3:28 PM

what is the effect of missing one phase from feeder , the feeder is parallel with other feeder . both feeding 12mw load , the system is 3 wire system , grounding by zig-zag transformer . each feeder 10 mw , 6.6kv

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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: lossing phase

10/26/2009 6:31 AM

The corresponding phase on the feeder that is still connected to the load will overload above 10MW, thereby causing its circuit protective device to operate and disconnect the overload.

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carel esnara
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Join Date: Aug 2009
Location: Baguio City, Philippines
Posts: 13
#2

Re: lossing phase

10/27/2009 12:53 AM

Apparently, the load will experince unvalance voltage which may cause the sensing device to trip.

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mzerighi
Member

Join Date: Oct 2009
Posts: 5
#3

Re: lossing phase

10/31/2009 5:11 PM

it was like this, when the operator switched off the feeder which messed one phase, the breaker opened not completely and one pole stayed closed , that cause the ground transformer and ground resister are burnt , trip other feeder.

is what happend made such high current in the ground (more than 250A) .
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