公开(公告)号：US06297642B1

公开(公告)日：2001-10-02

申请号：US09309605

申请日：1999-05-11

申请人： Kazuhito Shibahara ,  Masahiro Sumiyoshi ,  Yoshihiro Watanabe

发明人： Kazuhito Shibahara ,  Masahiro Sumiyoshi ,  Yoshihiro Watanabe

IPC分类号： G01R3112

CPC分类号： G01R31/1227

摘要： 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.

摘要翻译： 通过天线1等电气设备的局部放电与系统电源同步地产生的电磁波形由天线1接收。从包含在接收信号中的测量频率的电磁波形中，提取成分变化 根据系统电源的频率和频率两倍于系统电源的频率变化。 放电的存在或不存在由每个提取的组分的大小确定，从而检测局部放电。