Answer / dharmans

step-1-: the three phases of alternator connect to the
primary of which is our auxiliary transformer then the
output is connect to the LT bus which is have 440v rated.
then connect to a 3phase motor through a breaker or rated MCB.

step-2-: now observe the rotating direction from the drive
end side of the motor. if the motor rotating to
anti-clockwise direction the connection of cable color code
is R,Y and B. if the motor rotating to clockwise direction
of the cable color code is Y,B and R.

what is O.T?specify the acceptable range?

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Is it acceptable of installing an earth pit in planters area where bare copper cable, earth rod and connection are susceptible to corrosion due to water?

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How phase to phase voltage comes 440V.

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In EHV tranm. The conductors are …….. a) Cu roads b) Cu bars with Si c) Cu tube with Si plate

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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

1 Answers  

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