Question Regarding Electrical Earthing

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laut Participant Join Date: Oct 2012 Posts: 1	Question Regarding Electrical Earthing 10/12/2012 8:42 PM
	Dear all CR4 forummers, wish you all can advise me. i had a situation at site, where there is an amount of earth leakage enough to trip my ELR at Distribution Board. this DB supply the power to my control power of MCC and Switchgear. the strange part is, whenever i disconnect the protection relay earthing, things would be normal, no leakage occur. what is actually the main problem behind this. what equipment cause this leakage. hope can advise. tq
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Joshi Guru Join Date: Oct 2007 Location: India Posts: 1246 Good Answers: 34	#1 Re: Question Regarding Electrical Earthing 10/13/2012 4:03 AM
	There had been many threads in the past on ELR. Please "Search this Forum" on the right side of this page.
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#2 Re: Question Regarding Electrical Earthing 10/13/2012 7:24 PM
	Look here __________________ The reports of my death are greatly exaggerated.
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Wal Guru Join Date: Jun 2011 Location: Phnom Penh Posts: 4019 Good Answers: 102	#3 Re: Question Regarding Electrical Earthing 10/14/2012 2:01 AM
	the strange part is, whenever i disconnect the protection relay earthing, things would be normal, no leakage occur. That doesn't mean that the leakage is not occurring it just means that you are no longer detecting it. ergo you have spragged the protection. If your grounding system has been correctly designed and implemented and maintained you should be able to trace that leakage by a process of sectional disassociation and checking until the root cause is found and then take action. Meanwhile continue production with trepidation. __________________ Difficulty is not an obstacle it is merely an attribute.
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Andy Germany Guru Join Date: Sep 2006 Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E Posts: 17996 Good Answers: 200	#4 In reply to #3 Re: Question Regarding Electrical Earthing 10/14/2012 8:46 AM
	GA Well put. The OP is simply dangerous and badly informed. __________________ "What others say about you reveals more about them, than it does you." Anon.
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brettj1au Power-User Join Date: Feb 2009 Posts: 176 Good Answers: 6	#5 Re: Question Regarding Electrical Earthing 10/15/2012 9:30 PM
	Firstly by disconnecting the earth You are creating a dangerous situation & risking the life of yourself & others in contact with the equipment. As previously stated by another member, disconnecting the earth does not remove the fault it only stops the ELR from detecting it. Any thing from the cable through to the equipment connected to the circuit could have the fault causing the ELR to trip. MY advice would be to leave it all turned off, reconnect the earth & hire a qualified electrician to test the circuit & diagnose the fault.
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Andy Germany (1); brettj1au (1); Joshi (1); TonyS (1); Wal (1)

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