| 摘要 |
The present invention relates to a method of diagnosing a fault on a transformer winding by using frequency response analysis (FRA). The method comprises the steps of: measuring the impedance on said winding as a function of frequency, said measurement being represented in the form of a first voltage gain (k): comparing said impedance measurement with a reference measurement represented in the form of a second voltage gain (k'), said comparison including a step of calculating three first parameters, each of said three first parameters being a correlation coefficient (p1, p2 p3), between said first and second gains (k, k') over three different frequency ranges. The method further comprises a step of determining the relative variation of at least a fourth parameter (CR k, CR f, CR n), said fourth parameter being a physical magnitude characteristic of said transformer, said relative variation being obtained by comparing said first and second gains (k, k').
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