Transformer overheating protection
Transformer overheating protection
(OP)
Hi!
We're reviewing specs for new power transformers and
I've forgotten the basic theory behind temperature monitoring on transformers. For large power transformers the tank thermometer is temperature compensated by a ring CT on one of the LV bushings. ?
What is the exact reason for doing this? Is it to keep the thermometer temperature relative to the oil temperature? And is the conservator tank thermometer temperature compensated also?
Any info would be greatly appreciated!
We're reviewing specs for new power transformers and
I've forgotten the basic theory behind temperature monitoring on transformers. For large power transformers the tank thermometer is temperature compensated by a ring CT on one of the LV bushings. ?
What is the exact reason for doing this? Is it to keep the thermometer temperature relative to the oil temperature? And is the conservator tank thermometer temperature compensated also?
Any info would be greatly appreciated!






RE: Transformer overheating protection
Since actual winding temperatures cannot be read transformers due to HV, CT's are used to simulate copper loss in transformers. I think the CT secondary amps is used to heat a heater fitted in an oil packet and heater output is designed to reflect the transformer winding temp, which is done at design stage. Pls refer J&P book.
RE: Transformer overheating protection
Thanks edison123, that jolts the memory now! I just need to find the J&P handbook..!
thanks
RE: Transformer overheating protection
BTW, I've never seen a thermometer used to measure conservator tank temperature.
God bless!
RE: Transformer overheating protection
The explanation given by mvcjr is very correct. bravo. your suggestions and responses are very useful.