Earth Loop Impedance

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dotuntokun Member Join Date: Apr 2009 Posts: 6	Earth Loop Impedance 01/10/2012 6:30 AM
	Hello All, A client wants me to measure earth loop impedance on his 11kV network. I thought one could only measure earth loop impedance on low voltage (load)networks (secondary side of the transformers). 230V in this case. Please enlighten/confirm if this is possible. Thanks.
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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: EARTH LOOP IMPEDANCE 01/10/2012 7:25 AM
	A question of this type indicates the unsuitablility of the poster to carry out the task on safety grounds. Hire someone to do it instead. __________________ "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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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#2 Re: EARTH LOOP IMPEDANCE 01/10/2012 7:34 AM
	Perhaps a little research is in order... https://www.tlc-direct.co.uk/Book/8.6.2.htm __________________ All living things seek to control their own destiny....this is the purpose of life
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#3 Re: EARTH LOOP IMPEDANCE 01/10/2012 7:58 AM
	As PWSlack said, you should find a new line of work, soon. Does your client know you're clueless?
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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	#4 Re: Earth Loop Impedance 01/10/2012 8:23 AM
	The earth loop impedance of any network needs to be determined and recoded before the network is energised. There should be a record of it. Why does the Client want to know whether it has changed (rhetorical question)? It may be because of changes to the installation, in which case the organisation changing it will have carried out a test before re-energising. This is a document-chasing exercise between the Client and the organisation that changed the installation. Don't get involved. __________________ "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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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#5 Re: Earth Loop Impedance 01/12/2012 7:30 AM
	What has it go to do with voltage level? As long as there is a possibility of an earth fault in the system, it is important to measure the erath loop impedance.
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