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how to calculate the megger values for motor, cables and
transformers?

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how to calculate the megger values for motor, cables and transformers?..

The thump rule is voltage rating +1 example for a 11KV
motor it should be 11+1=12 Mega ohm.
In addition to that the PI is the ratio between 1Mnts and
10 mnts.It should be above 1.5
For examle IR at 1mnts= 10M.ohm,
IR at 10 Mnts= 20 M.Ohm
Then the Polarisation index is 2 which is consdierd
good.When it is below 1.5 you can heat the tranformer or
motor then the value will come up.

 Is This Answer Correct ? 25 Yes 4 No

how to calculate the megger values for motor, cables and transformers?..

see sundar
Meggering test is done for any electrical equipments to
find the insulation resistance value.
As per the standards for testing the machines 3 methods are
there
1)spot reading 2)time-resistance testing method 3)step
voltage test
the following is the second mehtod it is in use nowadays
PI=10 min/1 min value
Then the Polarisation index is 2 which is consdierd
good.When it is below 1.5 you can heat the tranformer or
motor then the value will come up.

 Is This Answer Correct ? 15 Yes 4 No

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