For a Potential Transformer(PT), the primary neutral terminal must be grounded

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..........?

Question Posted / ahmed shafiq

2 Answers
16963 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

For a Potential Transformer(PT), the primary neutral terminal must be grounded before energization..

Answer / om s.

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.

Is This Answer Correct ?

22 Yes

2 No

For a Potential Transformer(PT), the primary neutral terminal must be grounded before energization..

Answer / cnsubudhi

the fault current if any will be grounded.

Is This Answer Correct ?

5 Yes

5 No

Post New Answer

More Electrical Engineering Interview Questions

Can XLPE/SWB/PVC (P3) 7C X 2.5mm2 be replaced by Can XLPE/SWB/PVC (P2) 7C X 2.5mm2??? P3 vs P2

0 Answers PCSB,

How can get C license i am complete I.T.I electrician trade and 10 years experiance this field and i complete the dee from ksou by distance mode of this year.ksou means karnataka south open university but i want Tnelb license

2 Answers C License,

AT THE TIME OF INSTALLING THE POWER PLANT POWER IS TAKEN FROM NEARBY GRID AND GIVING THE SUPPLY TO THE GENERATOR WHICH ACTS AS MOTOR. WHAT IS THE NEED OF RUNNING THE GENERATOR AS MOTOR?

6 Answers

What is a DC series motor?

0 Answers Ericsson,

when ELCB breaks the circuit than INVERTER auto-connect the circuit to the battery than how can the operetor is safe??

1 Answers

IF 3 NOS.OF HEATERS,3KW CAPACITY EACH,1 NO.HEATER CONNECTED IN R PHASE,1 IN Y PHASE AND 1 IN B PHASE.THEIR END POINTS CONNECTED IN STAR.IF I CONNECT THIS STAR POINT TO NEUTRAL OR DO NOT CONNECT TO NEUTRAL.WHAT WILL THE DIFFERENCE.

3 Answers

Who is the first Bangladeshi Everest climber? Where is his home district?

0 Answers

what does the transformer connection symbol YNaod1 mean ?

3 Answers

Can anyone please give me the parameters , formula needed to calculate the circuit breakers for building services.Thanks

0 Answers Bhel,

WHY WE CAN GENERATE POWER IN 3PHASE MODE ONLY NOT IN 4 OR 5 PHASE?

8 Answers

Differentiate between Zero and Negative sequence current

0 Answers

working principal of online ups

0 Answers Delta Power Systems,

For more Electrical Engineering Interview Questions Click Here