Method of diagnosing a fault on a transformer winding

Details Method of diagnosing a fault on a transformer winding Method of diagnosing a fault on a transformer winding

2006-04-25

2006-04-25

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S546000, C324S726000

Reexamination Certificate

active

07034547

ABSTRACT:
The present invention relates to a method of diagnosing a fault on a transformer winding by using frequency response analysis. 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; comparing said impedance measurement with a reference measurement represented in the form of a second voltage gain, said comparison including a step of calculating three first parameters, each of said three first parameters being a correlation coefficient, between said first and second gains over three different frequency ranges. The method further comprises a step of determining the relative variation of at least a fourth parameter, said fourth parameter being a physical magnitude characteristic of said transformer, said relative variation being obtained by comparing said first and second gains.

REFERENCES:
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patent: 5396172 (1995-03-01), Lat et al.
patent: 5455506 (1995-10-01), Mimeault et al.
patent: 6466034 (2002-10-01), Wang et al.
patent: 6535000 (2003-03-01), Shuey
patent: 6549017 (2003-04-01), Coffeen
patent: WO 02/35248 (2002-05-01), None
S. A. Ryder, Conf. Record of 2002 IEEE Int. Symp. on Elect. Insulation, pp. 187-190, XP-001162794, “Methods for Comparing Frequency Response Analysis Measurements”, Apr. 2002.

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