Hi-pot test failure?

[Jonmad99]

Hello all. Just wondering if anyone has had any experience with this. We're installing a 3 conductor, 500 kcmil, copper tape shielded 15kva cable. We stripped off the rubber and aluminum sheathing. We noticed a small pinhole in the copper tape. Not sure if manufacturer or us. Wondering if anyone has had this problem before. It does not look like it penetrated the semi-conductor. Any info would be appreciated.

 

[zog]

What test voltage did you use? What test method? AC or DC hipot?

 

[Jonmad99]

Well we are still installing. The hi-pot hasn't taken place yet. But the other terminations he's been putting 22,000 ac I believe.

 

[weressl]

Hello all. Just wondering if anyone has had any experience with this. We're installing a 3 conductor, 500 kcmil, copper tape shielded 15kva cable. We stripped off the rubber and aluminum sheathing. We noticed a small pinhole in the copper tape. Not sure if manufacturer or us. Wondering if anyone has had this problem before. It does not look like it penetrated the semi-conductor. Any info would be appreciated.

A slight manufacturing imperfection of the copper tape should not be a problem and it would have shown up at the manufacturers test. Do you have the manufacturer's HiPot test report on the reel? I always ask the manufacturer of their recommendations what test should be performed at what stages of the installation. Mfr. Rep witnessed field tests often help with any subsequent warranty claims.

 

[zog]

Good advice, CYA. Just be sure they do an AC test, VLF, Tan Delta or PD. A DC hipot will likely not find an issue like that and it could fail when energized. Not to mention a DC test could make a small defect worse.