Just a silly question but just to make my curious mind bac
to normal - Why was not 67 and 67N
relays built into a single relay as i have noticed that the
R,Y,B CT wiring end up into the 67 relay
while the common of the R,Y,B CT wiring end up into the 67N
relay. Then it was better if a single relay was manufactured
just like the distance relay (21). Another question i would
like to ask is - how do we know where the 67 and 67 N
relay has to be placed.why is it not placed at the
transformer bay? In the substaion that i am working -i have
noticed that it is placed between a breaker and
a common double bus bar and this line bay is connected to
another substation at a remote place which is furthur
connected to a load.
B
U
S______CT for 67 & 67N ______Breaker _____ remot s/s.
B
A
R
Explain about how is it working Earth fault'relay and wahts the resistance value of earth bed
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on 22.03.2015 at 17:15hrs Y phase 66kV class Power Trf-2 Current transformer has flashed over and oil came out. The failed CT has been replaced on 24.03.2015 at 13:15hrs and the Trf has been charged in presence of RT Hassan after conducting the pre-commissioning tests. On the same day at 17:00hrs the commissioned CT has again flashed over and immediately the Trf has been isolated from power supply. It is confirmed the secondary is not opened and checked the earth integrity and is found ok. Here what would be the reason for the CT failure?
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