The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 1998
Filed:
Apr. 30, 1997
Tetsu Shiota, Osaka, JP;
Hideki Tokura, Osaka, JP;
Kenji Morimoto, Osaka, JP;
Takaho Tanaka, Osaka, JP;
Yoshiharu Kaneda, Hyogo, JP;
Keiichi Itoh, Hyogo, JP;
Ken Kimura, Hyogo, JP;
Shigeo Kitamura, Hyogo, JP;
The Kansai Electric Power Co., Inc., Osaka, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
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.