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Cable hi-pot withstanding time, why 15 minutes?

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    Jun 2015
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    Cable hi-pot withstanding time, why 15 minutes?

    Hi everyone, in my instruction of cable hi-pot testing, the shield cable withstanding time is 15 minutes, un-shielded cable is 5 minutes.

    It is super boring to hipot a high voltage cable, (step up time plus 15 minutes withstanding time, about half hour per cable. could we reduce the withstanding time), could somebody please explain why it needs 15 minutes?

    Thank you.

  2. #2
  3. Join Date
    Dec 2014
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    lol i second that! even more boring than transformer PI

    Quote Originally Posted by moon1958moon View Post
    It is super boring to hipot a hightvoltage cable, ( step on time plus 15 minutes withstanding time, about half houre per cable.

  4. #3
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    Boring, agreed. Related to cable testing, Were you instructed to raise the test voltage in 5 steps to max voltage?

  6. #4
  7. Join Date
    Mar 2015
    Location
    Pittsburgh, PA
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    Hi-Pot

    yes, 5 Steps.
    VLF testing cable is just as much fun.

  8. #5
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    Jan 2015
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    Normally we do an Insulation Resistance test before and after the 15 minute High Potential Test. I was wondering if this is standard or not? Thanks.

  10. #6
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    Why would you need to do insulation resistance twice?

    Quote Originally Posted by Will Ward View Post
    Normally we do an Insulation Resistance test before and
    after the 15 minute High Potential Test...
    I was wondering if this is standard or not?
    Thanks

  12. #7
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    Jun 2015
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    how were your megger readings the second time did they get worse? just curious if, and how bad the high pot damaged the insulation of the cable...

  14. #8
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    Jul 2015
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    underbid the job??? haha

    Are you an owner or an hourly paid employee? haha

    Wait the 15min man and plot the readings that you take every minute. You'll see the trend of the results should reduce quickly in the beginning and then start to level out at the end of the 15min period. Almost like a wave.

    Sometimes we plot these on an excel file and submit them with the report. It's a good visual to show you weren't just making up numbers.

  16. #9
  17. Join Date
    Dec 2014
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    tie all three cables together, do a gang test, and roll out early.

  18. #10
  19. Join Date
    Jun 2015
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    MEGGER BEFORE HI-POT

    I NEED TO MEGGER BEFORE HI-POT. BUT NOT DO IT AGAIN AFTER HI-POT.

    THE LEAKAGE CURRENT WILL BE STABEL OFTER TEN MINUTES OFTER GOT THE WITHSTANDING VOLTAGE. SO I DON'T THINK I NEED 15 MINUTES WITHSTANDING TIME. SUPER BORRING.

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