Method and system for corona source location by acoustic...

Details Method and system for corona source location by acoustic... Method and system for corona source location by acoustic...

G - Physics

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349/29

G01R 31/00 (2006.01) G01H 1/00 (2006.01) G01N 29/04 (2006.01) G01R 31/06 (2006.01)

Patent

CA 1096481

RD-8927 Abstract of the Disclosure An arrangement is provided for locating a corona fault in a transformer or other encased electrical apparatus by determining the propagation time for acoustic noise generated by a corona dis- charge. The electrical corona signal is envelope- detected, gated and level-detected during an in- terval which is adjustable as to delay and length to generate a timing reference to initiate acoustic signal averaging. A corona pulse can be found that results in an optimum signal-to-noise ratio in the acoustic signal being averaged, as in needed with limited test data in a noisy or reverberant acoustic environment. Also, multiple corona sources can be located.

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