[Amps] Vacuum variable hipot

[Randall, Randy]

That was an interesting read.  Thanks for sending the link.

Randy AB9GO

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On Behalf Of DF3KV
Sent: Friday, September 18, 2009 2:58 PM
To: amps at contesting.com
Subject: Re: [Amps] Vacuum variable hipot

I think that is still normal.
The 5KV rating normally is the peak AC test voltage rating at maximum
capacity, not the working voltage.
When those are stored for a longer time the vacuum might not be perfect
anymore, so it´s a good idea to calculate for safety margin on the voltage
requirement.
Only very few of probably 100 surplus capacitors I tested did not show
leakage current near the rated voltage or took higher voltages without
current flow.
Most failed at much lower voltages.

See also:

http://www.comet.ch/files/webcontent/servicebulletins/sb_28.pdf


73
Peter

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Steve
Sent: Freitag, 18. September 2009 13:03
To: amps at contesting.com
Subject: [Amps] Vacuum variable hipot

I have a Jennings UCSL1000 - 1000pF, 5kV cap. If I put 5kV dc across it
and run it through its tuning range, the leakage current is sometimes
zero but fluctuates and there are places where the current leaps up to
50uA. At those points the current falls to zero if the voltage is
reduced to around 4kV, although I have heard a couple of arc 'pops' from
it sitting there at 4kV.

At other settings where the current is lower, 5uA or less, the leakage
dies away to zero if I leave it sitting there for a while.

Is this normal behaviour? Is this one a duffer?

Thanks,

Steve
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