50Bf Relay Tripped Due to an Earth Near Fault

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Atilio Member Join Date: Jun 2009 Posts: 8	50Bf Relay Tripped Due to an Earth Near Fault 09/14/2010 12:20 AM
	Is it possible for a relay to trip due to a near aerth fault, it seems to be the case in our plant when a dissconected relay tripped when an etarh fault was present in a near line.
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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: 50BF relay tripped due to a earth near fault 09/14/2010 2:41 AM
	The problem isn't the relay. The problem is the earth fault. Seek it out and eliminate it. __________________ "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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SHAMITHGAMBHIR1 Power-User Join Date: Feb 2010 Location: dubai,mangalore,bangalore..... Posts: 145 Good Answers: 8	#2 Re: 50BF relay tripped due to a earth near fault 09/14/2010 4:37 AM
	yes it is possible for BF relay to trip on earth fault.......and what exactly do u mean by "disconnected relay tripped"......... anyways check out this link basler BF50 __________________ shamith gambhir, electrical engineer
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Jans Commentator Join Date: Feb 2009 Location: Tamil Nadu Posts: 66	#3 Re: 50Bf Relay Tripped Due to an Earth Near Fault 09/14/2010 1:48 PM
	More information may throw light on how a disconnected relay may trip. One obvious cause is the uncompensated mutual coupling -This may occur with a parallel feeder which is operating with one feeder out of service and grounded at both ends-The trip impulse may be blocked with say a breaker interlock. 50BF tripping is strange-how it was primed-is it heavy induction or lack of shielding.Perhaps the scheme may be rechecked carefully.50BF tripping can cause wide spread avoidable outage and will require involved analysis to trace out the cause. __________________ Better not count the cent if the risk is many many dollars.
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Jans (1); PWSlack (1); SHAMITHGAMBHIR1 (1)

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