Megger
- Thread starter easymoney
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macmikeman
Senior Member
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- Planet macmikeman
Depends on it the cable is de energized when you test it. If not you will get a really wild reading :grin:
brian john
Senior Member
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- Kilmarnock, Va
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- Retired after 52 years in the trade.
Depends on it the cable is de energized when you test it. If not you will get a really wild reading :grin:
Depends on length of cable, voltage utilized to test, time duration of test, Read some, there is a wealth of knowledge on the WWW, just google, megger, AVO, AEMC and cable test.
zog
Senior Member
- Location
- Charlotte, NC
Like Brian said there are lots of factors but temperature corrected to 20 degrees C it should be at least 1G.
zog
Senior Member
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- Charlotte, NC
Where did 500V come from? I agree it wont tell you much but I still dont see where he said that.
ANSI/NETA requires at least 2500VDC for a 5kV cable test. I wouldn't exceed 5kV though, not with DC being destructive, all the standards agree with that.
I would do a 2500VDC megger test followed by a VLF withsatand test, than once it is online do a PD survey to establish your baseline PD levels for future analysis.
macmikeman
Senior Member
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- Planet macmikeman
Brian, I still think your in for a pretty "wild" reading if you attempt to megger a 5000 volt cable live. All the meggers I ever used all said not to test while energized, but then again I never tested any cables rated over 600 volts. Maybe , but I would bet not.
brian john
Senior Member
- Location
- Kilmarnock, Va
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- Retired after 52 years in the trade.
I never intended the OP to test ANYTHING energized. Sorry if it came across this way.
nightmare
Member
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- MD and currently overseas
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If you are testing to rule out dead short, then you should hope for a successful result in the Giga Ohm range. If, however, you are testing the insulation for weak spots, then another test is required that can yield mixed results. The test is commonly referred to as a "high pot" test and if the insulation is suspect you can expect a catastrophic failure at, at least, one of the afore mentioned weak spots.
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If you are testing to rule out dead short, then you should hope for a successful result in the Giga Ohm range. If, however, you are testing the insulation for weak spots, then another test is required that can yield mixed results. The test is commonly referred to as a "high pot" test and if the insulation is suspect you can expect a catastrophic failure at, at least, one of the afore mentioned weak spots.
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