Partial discharge detecting device for switchgear

Abstract

The invention discloses a partial discharge detecting device for a switchgear, and the device comprises a first ceramic capacitor, a partial discharge signal extracting device, a live indicating device and a partial discharge signal detecting device, wherein the partial discharge signal extracting device comprises a second ceramic capacitor and a partial discharge signal extracting resistor; the first ceramic capacitor, the second ceramic capacitor and the partial discharge signal extracting resistor are sequentially connected in series, and the partial discharge signal detecting device is connected in parallel with the second ceramic capacitor; the live indicating device is connected in parallel with the partial discharge signal extracting device, and the live indicating device comprisesan inductor, a divider resistor and a live indicator, which are orderly connected in series; frequency response characteristic detection is pre-performed on the ceramic capacitor component, the working bandwidth range of the ceramic capacitor component is determined as f1-f2, and the values of the first ceramic capacitor, the second ceramic capacitor and the partial discharge signal extracting resistor required for detecting the high frequency partial discharge signal are determined according to the working bandwidth range. The application can prevent the live indicator from shunting the partial discharge signal when the live indicator is working normally, and the partial discharge detection precision is high.

Description

technical field [0001] The present application relates to the technical field of switch cabinets, in particular to a partial discharge detection device for switch cabinets. Background technique [0002] Insulation capacity is an important performance index of switchgear, and partial discharge detection is an effective means to reflect the insulation state of switches. At present, the commonly used switchgear partial discharge detection instruments include high-frequency current sensors and ultrasonic sensors. Among them, the signal bandwidth of the high-frequency current sensor is wide, the sensitivity is small, and the bandwidth is narrow, the sensitivity is high, and the detection accuracy cannot be guaranteed; the ultrasonic sensor is greatly affected by the surrounding environment and mechanical vibration of the equipment, and the ultrasonic signal attenuates greatly when it propagates in the insulating material , and it is difficult to guarantee the accuracy and reliab...

AI Technical Summary

Problems solved by technology

[0003] This application provides a switchgear partial discharge detection device to solve the problem of low detection accuracy of switchgear partial discharge signals

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