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drajesh1985
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Join Date: Feb 2008
Posts: 18

REF (Restricted Earth Fault Relay)

09/18/2011 10:49 PM

What is ANSI code for REF relay used in Mv Panels? Why it is called as REF though it act's as a differential relay?
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Tornado
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#1

Re: REF (Restricted Earth Fault Relay)

09/18/2011 11:16 PM

Because it really acts as a vectorial summation relay, in which the target sum is zero?

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kvsridhar
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#2

Re: REF (Restricted Earth Fault Relay)

09/18/2011 11:54 PM

Maybe some useful info here

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Akihito Shigeno
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#3

Re: REF (Restricted Earth Fault Relay)

09/19/2011 12:27 AM

Dear all,

REF is 64REF according to a Schneider's manual.

The protected zone is "Restricted" to the transformer internal.

Regards.

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Tornado
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#4

Re: REF (Restricted Earth Fault Relay)

09/19/2011 12:39 AM

Here is a list of ANSI relay number designations.

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