I agree with Steve. I have done this in the past but noticed one running
warmer than the other. It worked for me and will work this way, But it bothered
me. They won't be exactly the same. Another way is to rectify each
transformer, then combine that with resistors and off to the caps. Any
imbalance will be handled.
C
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Sent: Wednesday, October 22, 2025 9:00 AM
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Subject: Amps Digest, Vol 274, Issue 8
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Today's Topics:
1. Re: 12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 34
(Steve Harrison)
2. Re: 12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 34
(hzp_electronics@juno.com)
----------------------------------------------------------------------
Message: 1
Date: Tue, 21 Oct 2025 15:48:40 -0700
From: Steve Harrison <k0xp@k0xp.com>
To: amps@contesting.com
Subject: Re: [Amps] 12 KW CCS ON 160-15M....USING THE 3CX-6000A7.....
PART 34
Message-ID: <abff03f3-0c19-461b-8ec6-6d9d5da9239b@k0xp.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
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
------------------------------
Message: 2
Date: Wed, 22 Oct 2025 15:09:57 GMT
From: "hzp_electronics@juno.com" <hzp_electronics@juno.com>
To: k0xp@k0xp.com
Cc: amps@contesting.com
Subject: Re: [Amps] 12 KW CCS ON 160-15M....USING THE 3CX-6000A7.....
PART 34
Message-ID: <20251022.110957.9722.0@webmail04.vgs.untd.com>
Content-Type: text/plain; charset=UTF-8
Nothing is free. Putting the secondaries in series
and primaries in parallel doubles the primary to secondary voltage insulation
requirement.
73
.... Bill K3HZP
---------- Original Message ----------
From: Steve Harrison <k0xp@k0xp.com>
To: amps@contesting.com
Subject: Re: [Amps] 12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 34
Date: Tue, 21 Oct 2025 15:48:40 -0700
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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