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What is transformer no-load testing?

What is transformer no-load testing?

No-load current and on-load loss measurement of transformer is commonly called no-load testing, and below is called no-load testing for short.

No-load testing is to measure no-load loss and on-load current of transformer by exerting rated voltage(its rated frequency approximates sine waveform) from winding on either side of transformer(common is the winding on low voltage side), and the other windings are open circuit.

The main purpose of no-load testing is to measure product no-load loss and no-load current, then to judge whether it can meet relative standards or technical requirements or not; to find out partial or whole defects of iron circuit; to judge whether winding has turn-to-turn short circuit according to the comparison of no-load loss before or after product no-load loss and no-load current measurement.

Transformer no-load loss mainly is magnetic hysteresis loss and eddy-current loss generated by flux in iron core silicon steel sheet. Transformer no-load loss also includes resistance loss generated by no-load current on exciting winding and the loss generated in insulation dielectric. However, for the loss of the latter is much less than the former, in fact, no-load loss only refers to the former, and it is commonly called iron loss.





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