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vijaymail_electrical
Commentator

Join Date: Jan 2011
Location: India
Posts: 98
Good Answers: 2

DC Battery Earth Leakage Protection

03/10/2011 1:31 AM

Hi,

Can anyone explain how battery earth leakage protection operates. Bcoz CT is needed to provide current feed to relay but here as it is DC its not possible. However, when I read through one manual, it was given that shunt is being used in parallel to the current circuit and that path gives the feed for relay.

Is it so?

-Vijay

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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#1

Re: dc battery earth leakage protection

03/10/2011 2:12 AM

DC amperages can be computed by passing them through a shunt of known small resistance, and measuring the (small) voltage drop. It's just Ohm's Law.

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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#2

Re: dc battery earth leakage protection

03/10/2011 4:37 AM

Yes! It is through the shunt only. You seem to have read everything correctly. And, cross-checkiking with us. Huh!
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vijaymail_electrical
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Join Date: Jan 2011
Location: India
Posts: 98
Good Answers: 2
#3
In reply to #2

Re: dc battery earth leakage protection

03/10/2011 4:47 AM

no, its not like that. I used to get like these information from schematics through self study while I am at site and I assume that it works like that. thats all.. anyway thanks for your answer.

Cheers!

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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#4
In reply to #3

Re: dc battery earth leakage protection

03/10/2011 8:25 AM

Sorry! I was just kidding! Good to know that young engineers like you do take care to "read" the schmatics & manuals. Keep it up!
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electricalexpert65 (2); Tornado (1); vijaymail_electrical (1)

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