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conveo
Active Contributor

Join Date: Dec 2008
Location: Ha Noi - Viet Nam
Posts: 20

Distance Relays vs. Overcurrent Relays

05/13/2009 3:18 AM

any body can help me understand the difference between distance relay and overcurrent realy.

Thank
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Anonymous Poster
#1

Re: what is the difference between distance realy and over current relays.

05/13/2009 3:22 AM

http://cr4.globalspec.com/thread/37611/Distance-relay
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sb
Guru

Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#2

Re: what is the difference between distance realy and over current relays.

05/13/2009 3:47 AM

Distance relay

http://books.google.co.in/books?id=SSSFt-58uMAC&pg=PA192&lpg=PA192&dq=distance+relay+principle&source=bl&ots=PJ9rsGOevl&sig=WSf9YCdk06wgiay1fgwcy4bNz34&hl=en&ei=jnkKSoSILY-BkQWIwp2lCw&sa=X&oi=book_result&ct=result&resnum=8#PPA192,M1

Go through this literature from GE (The art and science of Protective Relaying) and most of the clarifications may be there (last page)

http://www.geindustrial.com/publibrary/checkout/Application%20and%20Technical|ger3965|PDF

also some interesting read:

http://www.geindustrial.com/pm/notes/artsci/artsci.pdf

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Punit Sharma
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Join Date: May 2008
Location: Chandigarh , India
Posts: 11
#3

Re: Distance Relays vs. Overcurrent Relays

05/13/2009 11:20 PM

Distance relay work on line impidence but overcurrent work on voltage/current
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Anonymous Poster
#4

Re: Distance Relays vs. Overcurrent Relays

05/15/2009 12:53 AM

Distance relay is also called impedance relay.

It compares the ratio of Voltage to current in the circuit.

In overcurrent relay; the current is increased from its predetermined value and may cause short circuit which is liable to damage the equipment.
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