Transient Fault 132 kV Single Circut - CR4 Discussion Thread

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kms3330 Participant Join Date: Apr 2012 Posts: 1	Transient Fault 132 kV Single Circut 04/30/2012 3:51 AM
	Hi Gentlemen, we are facing nine transient fault on 132kv single circut and there is no indiction!nothing i need your help informations on these problems: 1-it always happens mid night and early morning 2-weather is dry 3-there is auto reclosuer 4-insulations are good ,we did tests and results were ok(dust and flashover on them) 5-old lines: 70km and 90km 6-Distance relay((Static relay (PDS) 7-ground fault only 8-Distance and OVERVOLTAGE(ONLY DISTANCE operates) 9-same problems since 2000,only this year from 1/1/2012 to 20/03/2012 3 Transient Faults 10-no birds!
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pnaban Guru Join Date: Jun 2010 Location: srilanka Posts: 2725 Good Answers: 5	#1 Re: Transient Fault 132 kv single circut 04/30/2012 8:46 AM
	Do a line inspection,Check way leaves,due to wind they may be touching. Or birds __________________ pnaban
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cuba_pete Guru Join Date: Dec 2010 Posts: 1895 Good Answers: 44	#2 Re: Transient Fault 132 kV Single Circut 04/30/2012 11:53 AM
	Midnight to early AM may suggest the lowest point on the temperature gradient has some effect. the time may also indicate early morning load switching/balancing by customers and your utility to meet new working day loads. Auto reclose (single event?) should agree with minor surging...is the recloser within maintenance specs? Have the transient characteristics been evaluated up and downstream from the recloser? Can the event location be further isolated by time (nn km distances) on either side of the recloser?
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#3 Re: Transient Fault 132 kV Single Circut 04/30/2012 3:50 PM
	I am assuming since these are 132kV lines that trees are not the problem of your intermittent phase to ground faults. Do you have lightning protection or any other devices that are connected phase to ground on your line that could be responsible? How much (if any) of your 132kV lines are run underground? __________________ jack of all trades
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cuba_pete Guru Join Date: Dec 2010 Posts: 1895 Good Answers: 44	#4 In reply to #3 Re: Transient Fault 132 kV Single Circut 04/30/2012 4:39 PM
	Damn...good catch on the line height...and likely lack of height...that's forward thinking. If they were buried that would explain the OP's original statement of no birds. I had in the back of my mind more questions about protection and grounding, but I don't like the 20 questions posts.
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shakhawat Participant Join Date: Jan 2010 Posts: 4	#5 Re: Transient Fault 132 kV Single Circut 05/01/2012 10:53 AM
	would you please mention your relay signal
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Users who posted comments:

cuba_pete (2); jack of all trades (1); pnaban (1); shakhawat (1)

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