Investigation of the Influences of Residual Magnetic Flux and Injection Voltage Level on FRA Open Circuit Test of Transformer

抄録

The frequency response analysis (FRA) of transformer has been expected to be a good method for diagnosing the transformer condition. As the transformer impedance is affected by the configuration, the change of the impedance will be a good indicator for the change of the transformer configuration. On FRA measurement, the windings without measuring is set with an open circuit or a short circuit. In this paper, the experimental result about the open circuit test of FRA which can diagnose core defects etc. is described. Specifically, the influence on the impedances measurement by residual magnetic flux (RMF) and injection voltage level are described.