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Old 1st January 2007, 07:26 PM   #11
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I want to reduce the voltage out of my Plitron transformers, so, for me this begs the question: if a transformer has two 110v inputs and these are run in series, did I just reduce the V/A rating by half? And, how can I properly use the two sets of outputs?
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Old 1st January 2007, 07:28 PM   #12
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Hi Dan,

Call up Voller transformers in Melbourne.

He can wind hi current chokes to your specifications.

Macka
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Old 1st January 2007, 07:29 PM   #13
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Hi Macka!
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Old 1st January 2007, 07:55 PM   #14
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Quote:
Originally posted by carpenter
........... if a transformer has two 110v inputs and these are run in series, did I just reduce the V/A rating by half? .............

yes


Quote:
And, how can I properly use the two sets of outputs?
?

clarify question,please
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Old 1st January 2007, 08:48 PM   #15
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Quote:
clarify question,please
Well, your answer pretty well answers the second question. My 1000 v/a tranny is now 500v/a.

Or: 250 v/a per output tap because there's two pairs of taps...

For the standard ZV7-T, I should probably have more than 250v/a, so the two outputs should be rectified and then paralleled?

Rectified, then CLCLC, then loaded down, I'd probably have 30 volts. From each output pair there's 250 v/a divided by 30, which would give me 8.3 amps. The ZV7-T draws 6amps. So, it will take both taps (16.6 amps) for satisfactory operation?

Did I do this correctly?
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Old 1st January 2007, 08:55 PM   #16
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Quote:
Originally posted by carpenter


Well, your answer pretty well answers the second question. My 1000 v/a tranny is now 500v/a.

Or: 250 v/a per output tap because there's two pairs of taps...

For the standard ZV7-T, I should probably have more than 250v/a, so the two outputs should be rectified and then paralleled?

Rectified, then CLCLC, then loaded down, I'd probably have 30 volts. From each output pair there's 250 v/a divided by 30, which would give me 8.3 amps. The ZV7-T draws 6amps. So, it will take both taps (16.6 amps) for satisfactory operation?

Did I do this correctly?

in calcs you must start from Vac ratings..........
where Iac=Pac/Uac

so ........mebbe Iac is smthng more than 8.3 calculated
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Old 1st January 2007, 09:03 PM   #17
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Quote:
Originally posted by macka
Hi Dan,

Call up Voller transformers in Melbourne.

He can wind hi current chokes to your specifications.

Macka
Hi Macka,

Any idea what his rates are like? I can get Solen 4.7mH 16GA coils for AU$23 at the moment from Speakerbits (www.speakerbits.com). Their checkout quoted about AU$13 shipping to Perth. That's getting pretty hard to compete with.

I know I can rely on Solen quality. Can anyone vouch for Vollers quality? I should check him out for toroidals also...


Cheers,

Dan
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Old 1st January 2007, 09:18 PM   #18
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Quote:
mebbe Iac is smthng more than 8.3 calculated
That would make me very happy. How does that formula work?
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Old 1st January 2007, 10:16 PM   #19
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Quote:
Originally posted by carpenter


That would make me very happy. How does that formula work?

lets say that one winding have 250VA
then,say, one winding is 25Vac
in that case -you'll have I = 250VA / 25Vac

I = 10A


play little games with PSUd..........starting with CC load in range of expected..........and then just increase load current in steps,and look what you get

PSUd is in every case smarter than I am.......
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Old 1st January 2007, 10:41 PM   #20
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John, Actually that surpised me... But when series'ed and coupled, they are 4X right???
Sorry, I'm a little behind, Let's go back and catch up to my brothers phone connection...
It's not just the phone connection, I'm confused...
trying to catch up from last night I guess...
With the 2 windings coupled but paralelled You basically only have bigger wire and the same turns! Assentialy "BiFilar wound" and equivalent to a heaver guage wire! IMHO!
With the the 2 windings coupled and series'ed you should have 4X the L not 2X
With the 2 series'ed but not coupled you would have 2 X the L
When you have 2 115Volt windings on a 250VA xfmr, why do you think that is??? When you connect the 2 in series, you feed it with 230Volts RMS and get the same VA (more RMS volts but less current) still 250VA You also get 4X the Pri L that way Though
Just my 2Cents...
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