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Old 15th Jan 2020, 6:10 pm   #24
crackle
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Join Date: Mar 2011
Location: Basildon, Essex, UK.
Posts: 4,100
Default Re: Isolating transformer.

Quote:
Originally Posted by bluepilot View Post
Is it possible to have a "one size fits all" isolating transformer? The more power you draw from it, the more the output voltage will drop. A 30VA transformer will produce the rated output voltage when it is supplying 30VA. A 500VA transformer will produce the rated output voltage when it is supplying 500VA. Won't a 500VA transformer have an output voltage which is much too high when you are only drawing 30VA? At least that's what happens to me and I usually end up feeding the transformer from a variac.
No I dont think that is going to happen, it may be few volts drop, but if you put 240v in you should get 240v out. But a 500va transformer will have much better regulation than a 30va one.

Mike
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