>
>
>-----Original Message-----
>From: Rich Measures <measures@vc.net>
>To: Steve Thompson <amps@txrx.demon.co.uk>;
>amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
>Date: 18 June 1999 01:07
>Subject: Re: [AMPS] hipot testing
>
>>>Having got a hipot tester working, I'm looking for
>>>suggestion about leakage levels for testing transformer
>>>insulation. I have a really nice low resistance transformer,
>>>920-0-920 1A secondary with leakage from secondary to the
>>>core. The primary insulation gives 5uA at 4kV to the frame -
>>>is this low enough to warrant using the transformer on an
>>>insulated mount?
>>>
>>Is it an open transformer, Steve?
>
>
>It's probably what you mean by open. It's not encased in a
>sealed box of any sort but it has a very generous dip
>coating of varnish. It's from a good maker (Parmeko) so I
>expect it was vacuum impregnated too.
? If the slightly-leaky transformer were mine, to drive out moisture,
I would bake it in a 180 deg. F oven for a few days, and re-measure the
leakage. If the leakage decreased, I would hot-pot the transformer with
fiberglass laminating resin. (info on my Web site)
>
- good luck, Steve
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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