Lightning Arrester Blast At 11 kV

5 comments

Rate

muthuk10 Active Contributor Join Date: Sep 2014 Posts: 19	Lightning Arrester Blast At 11 kV 10/15/2014 8:35 AM
	Go fuses blow out at 11kv when we are replace the fuse the R phase lightning arrestor blast again we do replace all by new one now B phase lightning arrestor blast. kindly guide me why this is happen what is the solution?
	Register to Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

These comments received enough positive votes to make them "good answers".

RAMConsult Guru Join Date: May 2007 Location: NYC metropolitan area. Posts: 3230 Good Answers: 444	#1 Re: lightning arrester blast at 11 kv 10/15/2014 8:54 AM
	Your lightning arrsters are being subject to voltages above the MCOV (Maximum Continuous Operating Voltage). This may be due to a resonance condition caused by an excess of PFC (Power Factor Correction) capacitor, high switching/transient overvoltages, or simply improper selection of the LA. Hire someone who is familiar with this topic and let them guide you. __________________ “Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
	Register to Reply Good Answer (Score 2)

JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#2 Re: Lightning Arrester Blast At 11 kV 10/15/2014 10:28 AM
	Or... You were hit by a surge (lightning or otherwise), your lightning arresters did their job but were damaged and compromised in doing so, which is part and parcel to their function. You are now finding that out one at a time using the old "smoke test" procedure. Here's how I read your test procedure: 1) observe that fuse is blown. 2) replace fuse without determining why it blew. 3) blow next fuse. 4) repeat until budget is exhausted. This procedure, by the way, is frighteningly common. __________________ All I every really wanted to be, was... A LUMBERJACK!.
	Register to Reply Good Answer (Score 5)

dj95401 Guru Join Date: May 2009 Location: Saint Helens, Oregon Posts: 2216 Good Answers: 70	#3 In reply to #2 Re: Lightning Arrester Blast At 11 kV 10/15/2014 5:55 PM
	The "smoke test" unfortunately is used with anything involving electricity. But you would ~~think~~ hope that someone working in and around 11,000volts would have enough basic troubleshooting skills to troubleshoot why they are blowing fuse(s) __________________ Confucius once said, “ Ability will never catch up with the demand for it".
	Register to Reply

IQ Guru Join Date: Feb 2013 Posts: 2004 Good Answers: 31	#4 Re: Lightning Arrester Blast At 11 kV 10/16/2014 7:51 AM
	Check the obvious 1st, ratings, connections, earthing of LA's, the line, then work back to the source if this is on the incomer. Why are no protection relays tripping?
	Register to Reply

jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#5 Re: Lightning Arrester Blast At 11 kV 10/19/2014 2:31 PM
	Also check that the lightning arrestors haven't developed faults to earth causing phase to ground faults. __________________ jack of all trades
	Register to Reply

These comments received enough positive votes to make them "good answers".

Copy to Clipboard

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (68 right now) Show Members