Abnormality detecting method and apparatus for electric equipmen

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

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324547, G01R 2300, G01R 3102

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active

056800592

ABSTRACT:
The abnormality detecting method and apparatus for electric equipment measure the frequency spectrum of a signal detected by a partial discharge sensor 9, and detect a partial discharge signal having a frequency component in the neighborhood of a resonance frequency determined on the basis of the electric equipment and its measuring circuit, then detect the abnormality of the electric equipment. In a rotating electric machine particularly, the narrow band filter circuit 23 passes a frequency component around a resonance frequency determined on the basis of the length of the stator core to detect a partial discharge signal from the passed signal.

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G. C. Stone, "Partial Discharge--Part VII: Practical Techniques for Measuring PD in Opereating Equipment" IEEE Jul./Aug. 1991.

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