Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1997-04-30
1998-10-27
Nguyen, Vinh P.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
G01R 2300
Patent
active
058282270
ABSTRACT:
An abnormality detecting method and apparatus for electrical equipment measures the frequency spectrum of a signal detected by a partial discharge sensor and detects a partial discharge signal having a frequency component in the neighborhood of a resonance frequency to detect the abnormality of the electrical equipment. The resonance frequency is determined on the basis of the electrical equipment and the measuring circuit. Where the electrical equipment is a rotating electric machine, the resonance frequency is determined on the basis of the length of the stator core, and a narrow bandpass filter circuit passes a frequency component around a resonance frequency to detect a partial discharge signal from the passed signal.
REFERENCES:
patent: 4123009 (1978-10-01), Kilpinen
patent: 5126677 (1992-06-01), Campbell et al.
patent: 5416430 (1995-05-01), Twerdochlib et al.
Itoh Keiichi
Kaneda Yoshiharu
Kimura Ken
Kitamura Shigeo
Morimoto Kenji
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Vinh P.
The Kansai Electric Power Co. Inc.
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