The instrument uses the internal fault frequency response analysis (FRA) method, which is currently being developed and improved in developed countries around the world, to accurately diagnose internal faults in transformers based on the measurement of characteristic parameters of the internal windings.

After the completion of transformer design and manufacturing, its coil and internal structure are determined. Therefore, for a multi winding transformer coil, if the voltage level is the same and the winding method is the same, the corresponding parameters (Ci, Li) for each coil should be determined. Therefore, the frequency domain characteristic response of each coil is also determined, and the corresponding frequency spectra between the three-phase coils have a certain comparability.

During the testing process, the transformer may experience inter turn or inter phase short circuits, or collisions during transportation, resulting in relative displacement of the coils. Additionally, during operation, the distribution parameters of the transformer winding may change due to electromagnetic tension caused by short circuits and faults. Furthermore, it affects and alters the original frequency domain characteristics of the transformer, such as amplitude changes in frequency response and harmonic frequency point shifts. The transformer winding tester developed based on response analysis method is a novel non-destructive testing equipment for internal faults of transformers. It is suitable for internal structural fault detection of 63kV~500kV power transformers.

Technical Parameter