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carel esnara
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Join Date: Aug 2009
Location: Baguio City, Philippines
Posts: 7

Motor Insulation for Megger Testing

09/04/2009 1:20 PM

hi!.I'm a electrical eng'g student from Philippines.How many ohms is a good insulation when megger testing a motor with a megger tester range set at 1000V..?thanks..
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scooby1981
Member

Join Date: Sep 2009
Posts: 5
#1

Re: Motor Insulation for Megger Testing

09/04/2009 3:06 PM

As per IEEE, it is 100 Mohms at 40 deg C for medium voltage motors and 5 Mohms at 40 deg C for low voltage motors.
carel esnara
Member

Join Date: Aug 2009
Location: Baguio City, Philippines
Posts: 7
#2
In reply to #1

Re: Motor Insulation for Megger Testing

09/04/2009 6:57 PM

gentlemen, Thank you very much for the reply..This time I already have a knowledge about it.
popoy12345
Active Contributor

Join Date: Oct 2007
Location: Philippines
Posts: 17
#3
In reply to #2

Re: Motor Insulation for Megger Testing

09/04/2009 11:53 PM

Try to calculate the polarization index and Dielectric Absorption Ration for you to evaluate the resistance reading of the motor. It doesnt mean that if you obtain the minimum insulation resistance the motor insulation is good.
Emjay4119
Guru

Join Date: Dec 2005
Location: Queensland Coalfields Australia.
Posts: 548
Good Answers: 3
#4
In reply to #3

Re: Motor Insulation for Megger Testing

09/05/2009 3:09 AM

Exactly.

Try a google search for polarisation index, you will find some good articles. Once you understand please spread the word.

The great thing about polarisation is its ability to detect moist insulation and then measure your effectiveness at drying it out.
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carel esnara (1), Emjay4119 (1), popoy12345 (1), scooby1981 (1)

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