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. 21, 1997
Filed:
Dec. 20, 1994
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
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.