4-Why we measure the insulation resistance of main core and frame in spite of

4-Why we measure the insulation resistance of main core and
frame in spite of that must be connected with ground

before energize the transformer?

Question Posted / sun-moon

3 Answers
11329 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

4-Why we measure the insulation resistance of main core and frame in spite of that must be connect..

Answer / rachuri_sree

If there is any fault in the winding or core, the fault
current should be grounded and transoformer should be
tripped on on earth fault. If the transformer is healthy
the insulation resistance measured will be with in the
permisible value.

Is This Answer Correct ?

3 Yes

0 No

4-Why we measure the insulation resistance of main core and frame in spite of that must be connect..

Answer / mrudang

the 2 nd answer is quite right ,

actually we have to know the value of core insulation
its resistance , for its condition ,we have the standads
for it , and match with those value

if there is leakge current , the value should be lesser
we are doing between phase- earth , and phase to phase
so we match the phase to phase value also

Is This Answer Correct ?

0 Yes

0 No

4-Why we measure the insulation resistance of main core and frame in spite of that must be connect..

Answer / sr

Before energizing the transformer we are conforming that
the insulation of the core is healthy.if it got earthed
twice there will chance of circulating current during fault
condition.

Is This Answer Correct ?

1 Yes

2 No

Post New Answer

More Electrical Engineering Interview Questions

Do power transformers have an Automatic Voltage Regulator (AVR) just like the alternator/generator in a power system?

4 Answers

In Delta connected capcitor bank, One bank failed due to some problem. Can we connect Open delta capacitor bank to 3 phase motor. The motor voltage rating is 6.6KV. IF yes what changes will happen?

1 Answers

how set earth fault over current in relay

5 Answers Jacobs, Reliance,

How we Use DC Power in Transformers? is it possible ?

6 Answers

Difference between PLC and SCADA ? What are merits & De-merits of PLCs ? What are merits & De-merits of SCADAs ?

3 Answers Ambuja,

how can i select the cable ratings

4 Answers

Can we calculate the P.F if we know the only load on alternator .

1 Answers Medha, Medha Servo,

What are ampers.30kw motor.440volts.

5 Answers Pam Glatt,

What are the protections for HT Motors?

1 Answers BARC,

Where the excitation is given either stator or rotor in actually in power plants?

8 Answers

what is the meaning of electrical maintenance?

3 Answers GE Healthcare, MAHINDRA,

I have 2 KW electric water heater.I am gonna use it in controlling water temp.so I needed to increase or decrease the heating capacity.is there any electrical-electronic circuit for varying the resistance & so current?

1 Answers

For more Electrical Engineering Interview Questions Click Here