In a message dated 19/03/2005 11:25:30 GMT Standard Time, r@somis.org writes:
How do real high potential
testers manage to get a microphone inside vacuum capacitors and vacuum
relays?
Once corona (or any other breakdown)starts, there's a current. Sample that
current and use an audio amplifier! Feed the amplified signal to a scope when
you're testing with AC and you can see the breakdown duration etc.
gets very sophisticated - I saw it many years ago when we did an industrial
visit to a switchgear and transformer manufacturer. I suspect that these
days, industrial visits aren't allowed for 'health and safety' reasons. Sad,
because they could be very educational.
73
Peter G3RZP
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