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Anonymous Poster

Relay Settings

10/11/2006 5:32 PM

What is the main difference between the 50G and 50N settings. I know the 50G is for zero sequence ground fault taking signal from zero-sequence CT, and the 50N is a residual current from the sum of three CTs. But considering for relay settings are we treating them the same or is there different consideration and study has to be made between these two setting.
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ravipra01
Associate

Join Date: Oct 2006
Location: Hyderabad,India
Posts: 49
#1

Re: Relay Settings

10/12/2006 12:56 AM

Both sense the e/f currents.50N is the representation for main earth fault relay,while the 50G is the standby E/F relay (as a back up for the main earth fault relay).The purpose is same. Some time discrimination is maintained between the two to ensure a proper back up for the main earth fault relay.

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JRaef
Guru
United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#2

Re: Relay Settings

10/12/2006 7:28 PM

If you have a resistance grounded system, a 50N may not see enough ground current to trip properly. If you do not have a resistance grounded system, a 50G may create nuisance tripping.

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Anonymous Poster
#3
In reply to #2

Re: Relay Settings

10/13/2006 6:27 PM

Thanks for the reply,

could you explain it a little bit more

Thanks,
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PeterRyan
Active Contributor

Join Date: Aug 2007
Location: Orange County, California.
Posts: 13
Good Answers: 1
#4

Re: Relay Settings

08/18/2007 2:25 AM

Electronic trip relay for lowvoltage air circuit breaker (mitsubishi)

  • Ir Current setting dial
  • Iu Uniterrupted current setting dial
  • TL longtime delay setting dia
  • STD pick up setting dial
  • INST/MCR pick up current setting dial
  • Ip pre-alarm current setting dial
  • Tp pre-alarm time

installation automation modules.

The new relay has develope considerable for expansion

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