Temperature measurement of Power transformer windings in running conditions by resistance method
Posted by: ashokjain
on
How to measure winding temperature of power transformer by resistance method.How to measure resistance since the change in resistance is very small in milliohms.
What do you exactly mean by "resistance method"? Do you mean estimating losses by I^2R? This will give you incorrect results because it does not account for the AC losses in the wires which can be significant especially at higher frequencies.
The most common way to measure transformer temperature is to attach a thermocouple to the windings and another thermocouple on the core. Is there any reason you dont want to use thermocouples?