Partial discharge detection circuit and method

Abstract

The invention discloses a partial discharge detection circuit and method employing a geoelectric wave method. The circuit comprises a geoelectric wave detection sensor, a filter, a primary amplifier,a secondary amplifier, an analog-to-digital converter, a humidity sensor, a controller, an LCD, a comparison voltage generation circuit, a voltage comparator, and an alarm indicator light. The geoelectric wave detection sensor, the filter, the primary amplifier, the secondary amplifier and the analog-to-digital converter form a partial discharge amplitude detection circuit. The primary amplifier,the humidity sensor, a calculator, the comparison voltage generation circuit, the voltage comparator and the alarm indicator light form the partial discharge warning circuit. The LCD is used for displaying a partial discharge detection result. The circuit can achieve the partial discharge amplitude detection and partial discharge alarm, automatically adjusts the threshold of partial discharge alarm through the temperature changes, and achieves the more accurate partial discharge detection and alarm.

Description

technical field [0001] The invention belongs to the technical field of partial discharge detection in electric power systems, and in particular relates to a partial discharge detection circuit and method using a ground wave method. Background technique [0002] Partial discharge is one of the main manifestations of insulation defects in power system equipment, and detecting partial discharge is an effective way to evaluate power equipment. The current partial discharge testing methods mainly include: optical detection method, chemical detection method, acoustic detection method, and electrical detection method, among which electrical detection methods include transient ground wave method, high frequency and small current method, and ultra high frequency method. [0003] Due to the characteristics of easy engineering implementation, high sensitivity, and strong anti-interference ability, the transient ground wave detection method is a suitable detection method for engineering...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a partial discharge detection circuit and method using the transient ground wave detection method. The detection circuit and method can automatically perform dynamic partial discharge alarms according to the humidity of the test site environment to solve the existing problems. The problem of different partial discharge thresholds caused by humidity differences is not considered in the partial discharge detection: the same ground wave signal strength will not cause partial discharge under low humidity conditions, but may cause partial discharge under high humidity conditions In the existing detection method, if the threshold is set too low, it will cause serious false alarms, which will cause interference to maintenance. If the threshold is set too high, it may cause partial discharge without alarm, which may cause equipment failure.

Images