Megger

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    jeff-register


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    #222522

    Anyone ever use a megger to test caps? Also good for fishing but don’t get caught!

    Buccaneer
    Buccaneer

    US Member - 1 Year
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    #223848

    When the electricians use to megger cables at the power plant their
    equipment looked rather large, expensive, was flagged off,
    and probably plug into a 440 volt socket…… we were told to
    “Stay Away”……. Don’t think I’ll use one for testing caps, lol

    Prepare to be boarded!

    Avatar
    jeff-register


    Replies: 1254
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    #223856

    Buck,
    My megger is hand held old style with a crank. All it does is measure insulation or dielectrics resistance. Never measured the voltage it outputed but Vishay caps for mags are rated at 850 volts. I’ll try a used cap for electronics first & let you know. I like expermenting, Boom!!!
    I would bet the socket you speak of was 480 volts, 3 phase too. All a megger does when cranked is generate electrical current. Your guys had a motor to spin the genny too. You may be speaking of hi-pot test. It’s a megger on steroids. We hi-potentialed tested service sections before powering. It too checks insulation resistance only to the third degree.
    P.S. anything less than 2 meg ohms is a failure.
    Jeff

    Buccaneer
    Buccaneer

    US Member - 1 Year
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    #223862

    I remember hearing the term “Hi Pot” testing quite a few times during outages.
    Yes, three phase on the 480v. I use to say a prayer every time I had to lower
    or raise one of those 480 volt breakers, or take switching orders for the switch yard!

    Prepare to be boarded!

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    jeff-register


    Replies: 1254
    Topics: 48
    #223899

    Thats scary stuff working with I-line breakers. Had a friend killed by utilities non disconnect replacing a service section for a grocery store, also 480v @ 5000 amps. Tom never used his meter before putting a wrench on the bussing, it exploded.
    I bet a small megger would function. I’ll catch up with you. Too busy to get to it today. I was a “sparky” for too many years.

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    jcrigan

    US Member - 2 Years
    Replies: 143
    Topics: 14
    #223911

    If I remember right, those little handcranked meggers put out about 500 volts.

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