I noticed that when testing hipot in DC I always get leakage current, but not during AC hipot testing. Do you have any ideas about this? My hipot tester is Quadtech Sentry 500VA. I’m testing a dielectric made of PEEK and alumina.
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2Strange. I have had the opposite happen to me. Can you share a schematic or block diagram? – winny Aug 05 '22 at 18:03
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What is your equipment and what do you test? – Jens Aug 05 '22 at 20:19
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My hipot tester is Quadtech Sentry 500VA. I am testing a dielectric made of PEEK and alumina. – Ybx Nop Aug 08 '22 at 19:30
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Oh, PEEK, my favorite plastic. Interesting. Any dielectric properties would not change much between DC and 50 Hz. Do you have no active parts at all? – winny Aug 08 '22 at 20:06
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@YbxNop Can you ask a specific question? – Voltage Spike Aug 08 '22 at 21:09
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Is the leakage rising over time or instant visible? – Jens Aug 08 '22 at 23:17
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I suggest you grab a piece of polyimide and verify the workings of your device and setup. Definitely makes me wonder if there was a flaw in your material. Could someone have burned the PEEK in part of your manufacturing process or maybe the quality of alumina was not quite right to begin with? – Abel Aug 08 '22 at 23:34
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The PEEK is printed on top of aluminum substrate. The hipot connection is between the aluminum and the electrode (made of graphite) on top of the PEEK. I used another hipot equipment and showed me the same result. The leakage current is rising as I increased the voltage but for AC only. I tested an 18 awg wire and got the same result as well. So there is an explanation on why I got leakage current on AC and not with DC. – Ybx Nop Aug 09 '22 at 17:27
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Sorry guys what I meant is that in AC I have leakage current but not in DC. – Ybx Nop May 17 '23 at 19:59