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GSKrasle
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Outer insulation hole detection
GSKrasle   8/21/2014 12:26:14 PM
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I kike the idea of safety, but exactly how would a hipot test detect holes in the outside insulation of, say, a shielded cable? It seems the cable must be wrapped in foil, or passed through a conductive and compliant 'doughnut' while 'hot' to do this.

zeeglen
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Re: Outer insulation hole detection
zeeglen   8/21/2014 2:08:06 PM
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@GSKrasle exactly how would a hipot test detect holes in the outside insulation of, say, a shielded cable?

Good point.  Maybe the cable could be coiled up and dunked in a tub of salt water?

Sanjib.A
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Cable length under test
Sanjib.A   8/24/2014 10:21:43 PM
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@Martin: "...The allowable current depends on the application and the cable length..."

I have two questions:

1. Is there any guidance that could be found somewhere which specifies what should be the alloawable current (for AC test voltage there would be some current).

2. What should be  the cable length under test? For example, if an application specifies max length of cable as 30 mtrs., then how to determine what lenght of cable shall be subjected to test?

Jonathan Allen
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Re: Outer insulation hole detection
Jonathan Allen   8/28/2014 7:32:51 PM
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One way to test for pinholes or cracks in a cable's insulation is to immrse it in water.  Connect your hipot tester high side to the cable's conductor and the low side to an electrode immersed in the water.  We have also used that technique to check the encapsulation of photovoltaic panels.

Isuru Karunarathna
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Re: Outer insulation hole detection
Isuru Karunarathna   2/27/2015 12:27:03 AM
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could you pls let me elaborate the test setup for immersed cable testing in water?



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