What ratings stay constant in a dual primary 110/220 xfrmr?

leadbelly · 25th March 2004, 01:02 AM

Another thing I need to know but don't remember being discussed...

The example is a transformer with dual primaries, can be wired parallel for 110VAC mains and series for 220VAC mains.

1) Although such transformers are rated nominally as X VA in both cases, is this truly the result, or is one case typically a higher VA because of less voltage droop from overheating at high load?

2) If we wire the primaries for 220 VAC and use it in 110VAC mains, does the secondary rating actually become X/2 VA, or higher since there will me much less overheating and resultant voltage droop at high load?

leadbelly · 25th March 2004, 02:40 PM

What, no comment from the PS gurus? Sch3mat1c?

25th March 2004, 01:02 AM	#1
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	What ratings stay constant in a dual primary 110/220 xfrmr? Another thing I need to know but don't remember being discussed... The example is a transformer with dual primaries, can be wired parallel for 110VAC mains and series for 220VAC mains. 1) Although such transformers are rated nominally as X VA in both cases, is this truly the result, or is one case typically a higher VA because of less voltage droop from overheating at high load? 2) If we wire the primaries for 220 VAC and use it in 110VAC mains, does the secondary rating actually become X/2 VA, or higher since there will me much less overheating and resultant voltage droop at high load? __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

25th March 2004, 02:40 PM	#2
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	What, no comment from the PS gurus? Sch3mat1c? __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

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