Generator Field Circuit Breaker Fault

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Faiz6555 Member Join Date: Apr 2012 Posts: 8	Generator Field Circuit Breaker Fault 08/02/2012 2:45 AM
	the field circuit breaker contact in the path of discharging resistance got damaged during closing. what is the possible reason of damaging of this contact during closing. what are the risk faced by field breaker and generator rotor/ stator windings without this discharging/ arc quenching resistor.
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PWSlack Guru 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. Posts: 32175 Good Answers: 839	#1 Re: generator field circuit breaker fault 08/02/2012 3:08 AM
	Without being able to see the installation from here, one of the possibilities is that the contact closed onto a short circuit. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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raghun Power-User Join Date: Jan 2010 Location: Hyderabad Posts: 343 Good Answers: 22	#2 Re: Generator Field Circuit Breaker Fault 08/03/2012 3:13 AM
	The discharge resistor function is to discharge the stored energy in the field windings to earth when the main field CB is open. Thus, the contact in field discharge resistor circuit shall close after the main FCB opens and shall open before the FCB closes. It could be that the contact timing is not OK (didn't open before the FCB closed) and that resulted in damage to the contact. __________________ Raghunath
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