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drajesh1985
Active Contributor

Join Date: Feb 2008
Posts: 18

Protective Relays for Feeders

09/15/2011 3:15 AM

What are the types of protective relay used in feeder?
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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#1

Re: Protective relays for Feeders

09/15/2011 6:59 AM

A simple Overcurrent and Earthfault Relay to start with. It could be Definite Time or IDMT.

Add-on could be a short-time or instantaneous over current relay and a short time or instantaneous earth fault relay.

More comments after knowing what type of feeder you want to protect.
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brzk
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Join Date: Jun 2011
Location: ROUEN (in NORMANDY), 120 km from Paris, France, Europe, Earth, Sun Sytem, Milky Way, Universe.
Posts: 39
Good Answers: 3
#2

Re: Protective Relays for Feeders

09/16/2011 1:37 PM

WHAT TYPE OF FEEDER (s)? what voltage level?What feeder (s) use (s) ?

An overcurrent relay is good up to 33 kV (in some very few uses). Above and including 33 kV, you need either a distance protection (depending of the length of your feeder) or a differential protective relay. You may have (from 500 kV lines and above) a protection through satelites telecomm...So, what are the use and the voltage level?

Sincerly yours, BRZK.

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