Abnormality detecting method and apparatus for electrical equipm

Details Abnormality detecting method and apparatus for electrical equipm Abnormality detecting method and apparatus for electrical equipm

1997-11-17

2000-09-05

Nguyen, Vinh P.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

G01R 2300

Patent

active

061148717

ABSTRACT:
A defect detecting apparatus for monitoring an electrical equipment for defects, the electrical equipment having a resonance frequency. The defect detecting apparatus includes a sensor operatively connected to the electrical equipment for sensing a signal indicating a defect in the electrical equipment; a first bandpass filter operatively connected to the sensor, the first bandpass filter having a first bandwidth and first center frequency at substantially the resonance frequency of the electrical equipment; a second bandpass filter operatively connected to the sensor, the second bandpass filter having a second bandwidth and a second center frequency higher than the resonance frequency of the electrical equipment; a signal strength comparing circuit operatively connected to the first bandpass filter and the second bandpass filter for comparing relative strengths of signals output by the first bandpass filter and the second bandpass filter; and a partial discharge measuring circuit operatively connected to the signal strength comparing circuit for measuring an output signal of the first bandpass filter relative to an output signal of the second bandpass filter to indicate a defect in the electrical equipment.

REFERENCES:
patent: 5126677 (1992-06-01), Campbell et al.
patent: 5187434 (1993-02-01), Ando
patent: 5416430 (1995-05-01), Twerdochlib et al.
Wilfried Hutter, "Partial Discharges--Part XII: Partial Discharge Detection in Rotating Electrical Machines", IEE Electrical Insulation Magazine, vol. 8, No. 3, May/Jun. 1992, pp. 21-32.

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