Why DF are you the only voice in the universe. What I forgot about transformer design and manufacture you must still learn, you speculation are mostly wild and derogatory and unfounded. 😉
If you are an expert on transformer design why make silly remarks about simon7000's post instead of actually addressing the point he made? If he is wrong why not correct him? For example, why not do your estimate of likely stray capacitance and demonstrate that the leakage current measured by someone else in this thread must be wrong?
>>> I suspect higher voltage transformers will have less capacitive coupling.
>> Why?
> Thicker insulation, more turns increases spacing.
Wall-outlet voltages, to say 500V, all use the standard varnish and thickness. >500V gets added insulation, ordinary voltages all use about the same system.
You have more turns, but each turn is skinnier.
It may be more accurate to imagine each layer as a single foil wrap. How you split it up fat/thin makes little difference.
The problem comes up in audio transformers. Inductance scales with number of turns, capacitance more like physical size of winding. (Which makes high impedance broadband design tough.)
I may be wrong and welcome clarification. I don't think the stray capacitance per se varies much between 120V and 240V windings. The extreme voltage does double, so the same C is more leakage. I'm not aware this is a problem for UK/EUR workers.
>> Why?
> Thicker insulation, more turns increases spacing.
Wall-outlet voltages, to say 500V, all use the standard varnish and thickness. >500V gets added insulation, ordinary voltages all use about the same system.
You have more turns, but each turn is skinnier.
It may be more accurate to imagine each layer as a single foil wrap. How you split it up fat/thin makes little difference.
The problem comes up in audio transformers. Inductance scales with number of turns, capacitance more like physical size of winding. (Which makes high impedance broadband design tough.)
I may be wrong and welcome clarification. I don't think the stray capacitance per se varies much between 120V and 240V windings. The extreme voltage does double, so the same C is more leakage. I'm not aware this is a problem for UK/EUR workers.
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