What Is a Winding Resistance Test?
Quick answer — The winding resistance test measures the DC resistance of each winding by passing a DC current and reading the voltage, so the resistance (V/I) is obtained. It detects a poor joint, a loose or broken connection, or a turn fault by comparing the phases or against a baseline, and it is also used to derive the winding temperature in the temperature-rise test.
What is a transformer winding resistance test?
What it does
A DC current is applied and the voltage drop measured, giving the resistance of the winding and any connected leads/terminals.
Why it is done
It checks the winding and connections for a problem: a higher-than-expected or unequal phase resistance points to a loose or broken joint, or a winding fault.
Also used for temperature
The change in resistance with the temperature is used to calculate the winding temperature in the temperature-rise (heat run) test.
References & standards
- IEC 60076-1
- IEEE C57.12.90
Related
Related manufacturers
Prolec GE (GE Vernova) · Prolec GE Waukesha · Hitachi Energy USA · Siemens Energy · Eaton · Virginia Transformer Corp
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Technical content is prepared from engineering references, standards frameworks, manufacturer documentation and industry sources. Contractual or compliance decisions should refer to current official standards. TransformerPath Technical Editorial.
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