Transformer Winding Resistance Measurement
In the factory, it helps in determining the following:

(a) Calculation of the I2R losses in transformer
(b) Calculation of winding temperature at the end of temperature rise test of transformer.
(c) As a benchmark for assessing possible damages in the field.

It is done at site in order to check for abnormalities due to loose connections, broken strands of conductor, high contact resistance in tap changers, high voltage leads and bushings.