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Protection Riddle No.46- Difference between 50N and 50G
What is difference between 50N and 50G? And related advantage and disadvantages?
Author : Alfredo - From: Spain
 
#1
Sun, August 30th, 2009 - 15:06
According to IEEE 242 ,table 4-2 (Recommended practice for protection and coordination of industrial and commercial power system) the additional term on 50 and 51 ANSI code such as 50N or 50G is defined as follows:

G: Ground-fault protection which relay current transformer is located in a system neutral circuit.

GS: Ground-fault protection which relay current transformer is toroidal ground sensor.

N: Ground-fault protection which relay coil is connected in residual CT circuit.


 
Author : Hamid - From: Iran
 
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