Just a silly question but just to make my curious mind bac to normal

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

Question Posted / bejoypeedikayil

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Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N re..

Answer / k.prakashchandra

Such relay is available

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