Question { 18685 }

WHEN BOTH WIRES OF THERMOCOUPLE R SHORTED WHAT IS THE OUTPUT

THE TEMP ARE 0,30,250,320

Answer

your question is not clear please specify how they are connected

Question { 8862 }

Can CT Secondary left open circuited and why(reason)?

Answer

ct secondary can not be open circuited because if it is open
circuited then current in secondary is zero and secondary
voltage will become vary high and this will result in
saturation of core.

Question { 10930 }

Is there any difference between circuit breakers and
isolators

Answer

both circuit breaker and isolator make or break the circuit
but main difference is that circuit breaker operates on load
condition and isolators operate of load condition.circuit
breakers operates on fault condition or when we have to
interrupt the ciruit:
1. open the circuit breaker
2. open the isolator

and when we have to close the circuit:
1.close the isolator
2.close the circuit breaker

Question { 15697 }

For a Potential Transformer(PT), the primary neutral
terminal must be grounded before energization. Why....?
What will be heppend if we energize the PT without grounded
the primary neutral point? Why..........?

Answer

while connecting pt each primary phase winding is connected to phase to earth. The neutral point of load is connected to neutral point of secondary’s. Neutral point of primary is solidly earthed.
If primary neutral is not earthed the zero sequence component of voltages (due to earth fault) cannot flow through primary windings. Hence phase to earth voltages of system which contain zero sequence component do not get truly transformed and measured voltage are distorted. Hence the earth fault on system cannot be sensed on secondary side of VT.

Question { Power Grid, 6976 }

How would you supply power to a village which is very far
from a sub-station and has only a 11k?

Answer

it depends on how far the village is situated.considering the line losses 11 kv distribution may not be economical so we have to step up it to 33 kv and then transmit and then step down to 33 kv to 11 kv to 430 V.

Question { 7849 }

how many types in CT & define it ?

Answer

adding to rahul's ans-
CBCT(core balance curremt transformer) mounted at LT side
for load balancing. when difference between the load
current b/w two phases is greater then the minimum value
then it energize the coil to trip the circuit.