Method of diagnosing a fault on a transformer winding
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United States of America Patent
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Issued Date -
May 12, 2005
app pub date -
Oct 1, 2004
filing date -
Oct 3, 2003
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Abandoned
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Abstract
This invention relates to a method of diagnosing one fault on a transformer winding using a Frequency Response Analysis (FRA). This invention is adapted more particularly to power transformers. The method comprises the following steps: measure the impedance of the said winding as a function of the frequency, the said measurement being represented in the form of a first voltage gain k, compare the said impedance measurement with a reference measurement represented in the form of a second voltage gain k'. The method also comprises a step to determine the relative variation of the first resonant frequency exceeding 10 kHz, the said relative variation being obtained by comparing the said first and second gains k and k'.
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