Hi,
I have a microwave oven transformer that I plan to use for my next HV
power supply.
With the secondary unloaded and 220 V into the primary, I measured 670
mA through it.
This is a 220 V unit so that means 147 Watts, with no load on the
secondary. Magnetic shunts were taken off.
I have another two MOTs. Made the same measurement. They all behave the
same.
On the other hand, the transformers do not hum, not smoke, not even get
hot, so I was wondering if this primary current could be "wattless"
current, that is a current that is out of phase with voltage.
Should I worry about this amount of "idle current"?
Is this behavior particular to microwave oven transformers?
Is there a way to know what is happening here without using a double
trace oscilloscope?
Vy 73
Angel Vilaseca HB9SLV
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