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:
Aug. 14, 2007
Filed:
Dec. 06, 2005
Tomohiro Moriyama, Hitachi, JP;
Tatsuro Kato, Hitachi, JP;
Toshiaki Rokunohe, Hitachinaka, JP;
Fumihiro Endo, Hitachi, JP;
Ryoichi Shinohara, Hitachinaka, JP;
Tomohiro Moriyama, Hitachi, JP;
Tatsuro Kato, Hitachi, JP;
Toshiaki Rokunohe, Hitachinaka, JP;
Fumihiro Endo, Hitachi, JP;
Ryoichi Shinohara, Hitachinaka, JP;
Japan AE Power Systems Corporation, Tokyo, JP;
Abstract
In the measurement of partial discharge, a voltage detected by an antenna is input to a spectrum analyzer and a phase difference between an operating voltage and a power supply of the spectrum analyzer is obtained by phase domain analysis using the spectrum analyzer. Based on the phase difference and the voltage phase shift associated with the input impedance of a signal converter circuit, the time axis displayed on the screen of the spectrum analyzer is compensated. After the compensation has been carried out, the voltage detected by the antenna is input into the spectrum analyzer and the partial discharge pattern which synchronizes with the operating voltage is measured by phase domain analysis using the spectrum analyzer.