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POLE PIGS IN SERIES
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To: tesla-at-grendel.objinc-dot-com
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Subject: POLE PIGS IN SERIES
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From: richard.quick-at-slug-dot-org (Richard Quick)
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Date: Tue, 28 Mar 1995 21:39:00 GMT
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Quoting Ed Sonderman:
ES> Richard,
ES> If I can only find 7,620vAC pole pigs - can I put 240vAC in
ES> on the 120v tap and get 15kv out? Is the 240v input center
ES> tapped and grounded to the case to produce 120v? If so I
ES> won't be able to do this because we want to ground the case
ES> to our RF ground.
On every pig I have seen, all low-voltage windings are connected
through insulated bushings. I have done this on plate trans-
formers (run 240 volts into a 120 volt winding) to get higher
voltages out, but the transformer did not hold up long. Then
again, pole pigs are not plate transformers.
ES> Can I use two 7,620v pole pigs in series? Connect the 240v
ES> inputs in paralled and the secondaries in series?
This is the safe bet. It is very easy to do this, and the
configurations are very flexible. Two single-bushing pigs can
even be wired together: ground the cases to the RF ground, wire
the LV primaries in parallel; you end up with a pole pig setup
wired just like a neon sign power supply (two separate HV
windings, center tap ground).
I think that if I had two pigs run in series, I would always
connect the cases, and one HV bushing from each pig, to the RF
ground.
Richard Quick
... If all else fails... Throw another megavolt across it!
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