Microwave Oven Transformers (MOTs)

• To: tesla-at-pupman-dot-com
• Subject: Microwave Oven Transformers (MOTs)
• From: "Gavin Dingley" <gavin.dingley-at-astra.ukf-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 25 Apr 2000 20:53:53 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi all,
I know this has been covered many times before, perhaps too many times.
I have gone through the archives, but I'm not quite sure on allot of
points, so here I go.

You can connect the 240V primary windings of two MOTs in anti-phase
parallel, while connecting the ~2.5kV secondary windings in series. This
results in a supply that can deliver ~5kV -at- 250mA upto 1A?

As one of the secondary leads are connected to the core, electrically
you connect the HV lead from one transformer to the core of the next
transformer secondary?

However, this means that the cores must be insulated from each other and
separated by some distance to stop arc-over from one core to the other.

Now I read somewhere in the archives that there is a possibility of
server corona forming around the core of one of the transformers. Does
this happen all the time, or is it only during disruptive discharge, if
so, can't the HF be filtered out first. If the problem is always
present, then why, surely the potential difference across the secondary
windings would be the same as if the transformers were used on their
own?

I also came across in the archives that there is a current surge
associated with this set-up. Would it be possible to put an inductor in
series with the primary circuit so as to limit this current surge,
perhaps another MOT with it's secondary leads tied together.

Well, I'll leave it at that to get the ball rolling.

May I say in advance, thank you for you help. Your experience in these
matters is priceless.

Regards,

Gavin, U.K.

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