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

1 Answers
3663 Views
I also Faced
E-Mail Answers

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

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

Dear all, how we select the cable size according to current with or without including different correction factor , is there any direct method for sizing of cable...

0 Answers Kharafi National,

How will you determine the rating of a motor for continuous duty variable load motor applications?

1 Answers

why we setting 95 deg and 105 deg in wti and oti of distibution transformer ? give the reson for that ?

0 Answers

Why VL is more than the Vc?

2 Answers

if field current decreases how can the speed increase in the unloaded dc series motor

1 Answers

what is the function of series reactor

3 Answers Adhunik, INOX, RMSI,

can any one suggest paper presentation topies for electrical engg?

0 Answers

why we are used D.c. voltage in L.T.side or controling side.we can use UPS also ,in place d.c. voltage

5 Answers ABB,

when a cunductor is being disconnected from live cct, still it showing charged, if its checked by line tester?

8 Answers GEB,

Explain using drawings what is reverse PID action w.r.t PID controllers.

0 Answers L&T,

why breaker closing coil gets burnt if supply is continously provided to it.

1 Answers TATA,

how does a liquid starter reduce the starting currents?

0 Answers

For more Electrical Engineering Interview Questions Click Here