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Phasing Microwave Xfrmrs 120 and 220
From: Thomas McGahee[SMTP:tom_mcgahee-at-sigmais-dot-com]
Sent: Sunday, October 26, 1997 8:04 AM
To: Tesla List
Subject: Phasing Microwave Xfrmrs 120 and 220
>
> From: Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
> Sent: Saturday, October 25, 1997 6:40 AM
> To: Tesla List
> Subject: Re: Driving microwave transformers with 220V
>
> On Friday, October 24, 1997 7:15 AM Aric C Rothman
> [SMTP:Aric_C_Rothman-at-email.whirlpool-dot-com] wrote;
>
> > I have obtained two 2100V uwave transformers. I'd like to wire the
> > primaries in parallel and the secondaries in series (dots together),
> > as has been discussed here. Has anyone tried driving such an
> > arrangement with 220V with some sort of ballast. Any success with no
> > ballast and low duty cycle (30s-1m with 5min breaks)? These
> > transformers came out of 800-1200W rate uwaves.
>
> Aric, except for some industrial mirowave transformers they have built in
> magnetic shuts so ballasts are not necessary. To set up two microwave
> transformers for 220 service you would have to put both the primaries and
> the secodaries in series. You will also have to first remove the connection
> from one side of the secodary to the core other wise you will be left with
> a hot core (not safe).
>
Alfred,
I believe it is perfectly OK to have the connection to core left intact so long
as you connect both cores together, ground the cores, and have the primaries in
anti-series instead of regular series. That will ensure the proper phasing.
Assume 120 v primaries. Here is the rule:
For 220 operation put primaries in anti-series. For 120 operation, put
primaries in anti-parallel. In EITHER case, wire secondary cores together and
to ground, and now free secondary ends are out of phase and producing the
DOUBLE output you desire.
Fr. Tom McGahee