Why does my transformer get burning hot when not in use?
I have a transformer from a microwave. A few of them. I replaced the secondary windings on them for my own nefarious purposes. I am having a problem with the primary windings getting extremely hot when I am not drawing any current from it at all, basically when it's idle, but plugged in. When i connect the secondary to a load it actually runs cooler. I feel like there is some component missing. Any advice would be greatly appreciated.
- billrussell42Lv 72 months agoFavourite answer
you wound the new secondary incorrectly, or you have shorted turns. or you have too high a voltage for the insulation, and you are getting arcing.
no load and the secondary voltage is higher, and you get more arcing, more losses.
- Anonymous1 month ago
Make sure you correctly wired your transformer. Also, make sure you are not inputting more power than what the transformer is rated for.
- PhilomelLv 71 month ago
Check to see if it is oscillating at high frequencies.
- frank lynnLv 61 month ago
Sounds like the primary is running at a Voltage higher than its rating. That's about the only thing that would increase the heating.
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- 異域秦後人Lv 72 months ago
The heat comes from iron loss and copper loss that are existed from most transformer. Microwave oven transformer was designed ever running in idling all the time
- Anonymous2 months ago
< I replaced the secondary windings on them for my own nefarious purposes >
You screwed up.