On 10/20/2025 6:50 PM, jim.thom jim.thom@telus.net wrote:
Secondary wiring now completed. The 2 x 5300 vac secondary's are also
wired in parallel with GTO-15 HV wire...(15 kv AC rated, and uses 14
ga stranded wired).
I think I would have rathered wired them in series, because you can bet
that those transformers do NOT have exactly the same output voltage as
one another. Thus, by wiring them in parallel, you are going to have one
of them bucking or boosting the other transformer, causing them both to
draw more idling current as well as dissipating useless power internally
due to the bucking-boosting. By wiring them in series, that won't
happen, and the one at the "high end" of the 5300-volts would still have
that same voltage if wired in parallel. That's how I wired a pair of
pole pigs for a good friend of mine some years back. He first attempted
connecting them in parallel but had them drawing well over ten amps just
idling that way. In series, that dropped down to less than an amp or so.
This is less of a problem with smaller transformers simply because the
current draw, when they are very-slightly mismatched, is much less and
generally more-withstandable. But try putting an ammeter between them
and you'll easily find the difference.
Steve, K0XP
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