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Dorsey
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Join Date: Sep 2008
Posts: 31

Phase-to-Phase Fault Detection

05/14/2009 11:08 AM

Pls, what can be used to detect a phase to phase fault, if differential relay was not installed. I know an earth fault relay would not detect it but would an over current relay detect it.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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.
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#1

Re: Phase To Phase Fault Detection

05/14/2009 11:40 AM

An overcurrent device supplying the circuit will trip. Most of these things can be fitted with auxiliary contacts these days.

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Akihito Shigeno
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Join Date: Oct 2008
Location: Jakarta Indonesia
Posts: 123
Good Answers: 7
#2

Re: Phase-to-Phase Fault Detection

05/15/2009 5:48 AM

Dear all,

Phase-to-phase fault current has the value of 86.6% of 3 phase fault. In many cases, 3phase over current relay is can trip a phase-to-phase fault. If you need to detect and trip phase-to-phase fault with higher sensitivity, apply negative sequence (=unbalance)current relay, (ANSI device number = 46).

Regards

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 Akihito Shigeno @ JGC-Indonesia
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