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Kuncoro
Associate

Join Date: Aug 2008
Posts: 31

Polarization Index of Power Transformer Measurement

02/15/2014 1:51 AM

Dear Sirs,

I have result of power transformer assessment during tested the Polarization Index (PI). The result of PI measured between HV to LV of that transformer @5kV-DC was 7.5. Do you have anything experience to be shared regarding this PI measurement result. I will look forward your kind advice. Highly appreciated to share this discussion.

Thanks,

Kuncoro
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TNEB kathirasan
Active Contributor

Join Date: Feb 2014
Location: India
Posts: 11
#1

Re: Polarization Index of Power Transformer Measurement

02/16/2014 11:58 AM

what do you expect from the message?
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Kuncoro
Associate

Join Date: Aug 2008
Posts: 31
#2
In reply to #1

Re: Polarization Index of Power Transformer Measurement

02/16/2014 3:26 PM

What does it means 7.5 regarding of the PI measurement as I know the highest PI result to show an excellent insulation is 2-4. Thanks,
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PeterT
Guru

Join Date: May 2010
Location: Liverpool, NY
Posts: 961
Good Answers: 131
#3
In reply to #2

Re: Polarization Index of Power Transformer Measurement

02/17/2014 8:19 AM

Your understanding is incorrect. Polarization index may be higher than 4, and when it is, it generally indicates excellent insulation condition. See the following explanation. It gives a good summary of the different elements contributing to the current that is measured during the PI test, and how they impact the result:

http://www.electrical-testing-safety.co.uk/regulations/polarisation-index

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Kuncoro
Associate

Join Date: Aug 2008
Posts: 31
#4
In reply to #3

Re: Polarization Index of Power Transformer Measurement

03/06/2014 2:36 AM

Thank you for your kind advise regarding this subject. Is that the reference as you mentioned as similar s alike IEEE, NETA standard? If so, How can I have it either softcopy or hardcopy book by purchasing of that book.
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Kuncoro (2); PeterT (1); TNEB kathirasan (1)

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