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sprajah
Active Contributor

Join Date: Jul 2009
Posts: 11

Hipot Testing on Cables

07/25/2010 10:19 PM

There seems to be no commonly acceptable standard/or practice on the test voltage and the duration for the hipot tests on the HV cables.

For example,for a 33KV cable commissioning test after laying,DC voltage of 67KV dc (twice the system voltage + 1 kv) for 15 mts.is in vogue in INDIA.

Engineers now opine that this is not safe for the cable,1 mt. or 5 mts duration is ideal.

Better still is to test the cable with a VLF (very low frequency such as 0.1 H etc) at a

much lower volt and shorter duration than DC hipot test.

Specialists' recommendation with proof of authority when in dispute will be very helpful

to the community.
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Pathfinder Tags: high volt testing hipot tests
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wareagle
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United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#1

Re: Hipot Testing on Cables

07/26/2010 12:15 PM

check here http://search.atomz.com/search/?sp-q=hi+pot+test&sp-k=&sp-a=00031346-sp00000000
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thccontrols
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Join Date: May 2010
Location: UK
Posts: 89
Good Answers: 2
#2

Re: Hipot Testing on Cables

07/27/2010 1:12 AM

there was a discussion earlier this year on this subject and I can't find it, however, there are white papers that say consistent high voltage testing of cable does more harm than good and causes micro-cracks in the insulation.. again I wish I could find that paper

I've included a few links that might be helpful

http://www.cirris.com/testing/guidelines/hipot_testing.html

This pdf is VERY enlightening

http://www.imcorptech.com/Papers/Utility%20Experiment%20Verifies%20Destructive%20Nature%20of%20VLF%20HIPOT%20Withstand%20Testing.pdf

and finally

http://www.emersonprocess.com/Home/library/articles/maintfacts/maintenancefacts0310_hipot-testing.pdf
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