[AMRadio] Insulation Resistance


gkb gkbrown at gwi.net
Tue Feb 13 15:18:53 EST 2007


I am kinda lost on this Rick. A megger measures resistance from winding to
winding or winding to ground.  A megger is pretty much useless for measuring
winding resistance. If you do get a megger, be careful. Some are only good
for 500 volts. That's not enough if your doing HV trannys and chokes. Yes, I
would recommend a HY-POT tester that's good for 5KV. A rule of thumb is to
Hy-Pot at twice the rated voltage plus 1000. There are also test equipment
out there that measure resistance while using a Hy-Pot. This test is called
a P.I.E test( Polarization Index Test ). It measures the insulation
resistance at certain time intervals and you calculate if the insulation is
good, fair or bad. I do this when rewinding transformers.
Regards,
Gary...WZ1M
----- Original Message ----- 
From: "Rick Brashear" <rickbras at airmail.net>
To: <AMRadio at mailman.qth.net>
Sent: Tuesday, February 13, 2007 2:11 PM
Subject: [AMRadio] Insulation Resistance


> List:
> A buddy pointed out a fact I had not considered.  When I get a megger I
> will need to know what the resistance or approximate resistance of the
> wire/insulation of the transformer or choke should be.  If not, I won't
> know any more than I do.  Is there a rule of thumb that can be applied
here?
>
> Thanks for any and all advice.
> Rick/K5IZ
>
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