Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1994-12-20
1997-10-21
Nguyen, Vinh P.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324547, G01R 2300, G01R 3102
Patent
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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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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