Millitary Transformer

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KMoffett said:
Oops! Misread the chart. Still seems counter intuitive. Increase in humidity also increases breakdown voltage. Now throw a bucket of water an high voltage circuit.

Ken
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Water behaves differently in gas form, also pure water is a very good insulator so it's no surprise to me. It's only when condensation forms and dissolved ionic compounds start to cause tracking does humidity cause problems with HV circuits.

I wonder if water vapour is a better insulator than air? This evidence would suggest that this is the case.
 

The reason the volts are higher on the secondary is because my house is a steady 120v not 115.
Also the max altitude is most likely because of it benign sealed oil. Exceed that height and the thing probably pops like a small grenade.
 
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duffy said:
What is this power supply for? Part of an antique radio or something?
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I use it for a varietal voltage supply. I use it for bench testing that requires high draw. Example, transmitters or amplifiers (audio and RF). Ill take some pics and post them.
 
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Here are some basic pictures of those transformers in the end-use as a variable voltage power supply.
 

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Hero999 said:
I wonder if water vapour is a better insulator than air? This evidence would suggest that this is the case.
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I would disagree - certainly water vapour encourages arcing at the final anode of a TV set.

Also, to help find the exact point where arcing may be prone to occur it's common practice to breath on the suspected points, and the water vapour (or beer fumes ) in your exhaled breath will start the arc forming.
 
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