Patent Number: 6,297,642

Title: Partial discharge detection method

Abstract: An electromagnetic waveform developing in synchronism with a system power supply by a partial discharge of electric equipment such as a power distribution device is received by an antenna 1. From the electromagnetic waveform of measurement frequency included in the received signal, there are extracted a component changing according to the frequency of the system power supply and a component changing at the frequency twice that of the system power supply. The presence or absence of discharge is determined from the magnitude of each of the extracted components, thereby detecting a partial discharge.

Inventors: Shibahara; Kazuhito (Kyoto, JP), Sumiyoshi; Masahiro (Toyama, JP), Watanabe; Yoshihiro (Toyama, JP)

Assignee: Nissin Electric Co., Ltd.

International Classification: G01R 31/12 (20060101); G01R 031/12 (); H01H 009/50 ()

Expiration Date: 10/02/2018