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The input current of my 230V 2kVA variac is about 60mA (measured) under no load. That amounts to an inductance of about 12H. A 120V winding would have about half the number of turns and thus 1/4 of the inductance, i.e. 3H. The secondary inductance of the OPs PT will be similar.
The impedance of this inductance is about 1.1k. Connected in series with a 240V 1A bulb (240ohms), the bulb will be quite dim. Most of the voltage drop will be over the winding. That assumes, that there is no load on the high voltage side of the PT and that it won't go into saturation. It probably will saturate to some extent. Measuring the voltage drops or better scoping them can be a good indication of saturation.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
All,
It is a pity that redruM69 left the thread, but perhaps others will benefit, because the obvious solution is to drive the transformer with a VFD. A VFD does not put out full voltage before it has reached the maximum frequency that it will produce, and at that frequency, the primary will be able to support many more volts per turn than it will at mains frequency.
I have here before me a 2kW 7.5kV transformer with a 110V primary. Driven by a 220V VFD, it puts out 15kV at 400hz.
Registered Member #102
Joined: Thu Feb 09 2006, 08:15PM
Location: Raleigh, NC
Posts: 169
these encapsulated transformers are increasingly rare. They are wonderful power supplies when powered in the manner for which they were designed. It would be a terrible shame to see this device ruined by powering it at 2x it's voltage without increasing it's drive frequency as well. Get another transformer.
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Opinions on pushing an 120v PT to 240v
