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Topic Title: NVD Protection
Topic Summary: Neutral voltage displacement
Created On: 10 July 2008 10:29 AM
Status: Read Only
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 10 July 2008 10:29 AM
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matapattu

Posts: 18
Joined: 18 July 2006

Could anyone explain what Neutral Voltage Displacement protection in a network is and applications of it ?

I have got to do settings on an exisisting NVD relay to match the new NVD condensors of 120pf. The existing Edgecome Peebles NVD relays are designed to operate from a 60 or 90 pf capacitor cone. I was unable to find any sourse of infomation on this Edgecome Peebles relays.
Would anyone who has access to any info on this type of relays (Edgecome Peebles NVD relays)please advise where to find them ?

MA
many thanks
 11 July 2008 12:38 PM
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speariti

Posts: 1
Joined: 18 January 2003

For a three phase power system, the sum of the three phases to earth voltages should balance roughly to zero under healthy conditions). However, when an earth fault occurs there is a rise in the neutral voltage, so called neutral voltage displacement, and this balance is changed. A residual voltage measuring relay such as the SPAU110 provides earth fault protection on such a system.
 12 July 2008 10:54 PM
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matapattu

Posts: 18
Joined: 18 July 2006

speariti, Many thanks for the reply
IET » Energy » NVD Protection

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