| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce a cost for a partial discharge detector by actualizing detection on whether a failure exists or not by adding thereto a small amount of hardware. <P>SOLUTION: This partial discharge detector is equipped with a sensor for detecting partial discharge to generate a current signal, a matching resistor for the sensor for converting the current signal into a voltage signal, first and second input resistors connected to a power supply for determining a reset input terminal voltage together with the matching resistor for the sensor, a dummy pulse generator for generating dummy pulses at fixed time intervals when the terminal voltage is a normal voltage lower than a prescribed voltage and interrupting the generation of the pulse voltage when the terminal voltage is an abnormal voltage higher than the prescribed voltage, an amplifier for amplifying a voltage signal owing to the dummy pulses from the pulse generator or owing to partial discharge, and a partial discharge determination/self-diagnosis circuit for performing determination on whether partial discharge has occurred or self-diagnosis by using a signal from the amplifier. <P>COPYRIGHT: (C)2004,JPO</p> |
