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4hv.org :: Forums :: High Voltage
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Excessive current into capacitive voltage divider / corona sensor

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Fredrick
Fri Jun 20 2008, 04:25PM Print
Fredrick Registered Member #1339 Joined: Wed Feb 20 2008, 04:43PM
Location:
Posts: 9
I am testing an old Biddle corona detector to 50KVAC and am getting some strange results. The input C (C1) is 0.003uF and the tap cap (C2) is about 1.25uF for a 400:1 nominal ratio. The low cap goes to ground via a 25mH choke (this is the corona signal tap)

I'm getting almost 5mA at 4KV 60Hz yet the measured C is correct at 3000pF. The DC 50KV hi-pot was ok, no pops or fireworks and no current. I have about 20K ohms in series to limit the fault current and damp possible oscillations..

What the heck is going on here ?
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GeordieBoy
Fri Jun 20 2008, 05:09PM
GeordieBoy Registered Member #1232 Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
The 5mA of AC current flowing at 4kV/60Hz is consistent with what you would expect through a 3nF capacitor with AC voltage applied. (It's reactance at 60Hz is around 884k.)

BTW If a 3nF capacitor breaks down with 50kV across it, there will probably be more of a loud bang than a polite pop!

-Richie,
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