Method for detection of partial discharge of switch cabinet

Abstract

The invention discloses a method for detection of partial discharge of a switch cabinet in the field of power grids. The method for detection of partial discharge of the switch cabinet comprises the steps that initial locating of a partial discharge point is conducted, namely the general position of the partial discharge point of the switch cabinet is determined through two ultrahigh-frequency sensors; accurate locating of the partial discharge point is conducted, namely the accurate position of the partial discharge point of the switch cabinet is determined through multiple ultrasonic sensors; phasing of the partial discharge point is conducted, namely phasing is conducted on the partial discharge point of the switch cabinet through a high-frequency current sensor and a transient earth voltage sensor, and the type of partial discharge is determined. The method for detection of partial discharge of the switch cabinet has the advantages that the problem of interference exiting in the process of detection of partial discharge of the switch cabinet is effectively solved, the credibility of a detection result is improved, accurate locating and phasing of the discharge position are achieved, locating of the partial discharge point of the switch cabinet is accurate to the centimeter level, the type of partial discharge is determined, and engineering technicians can quite conveniently grasp the operation conditions of the switch cabinet.

Description

technical field [0001] The invention relates to a partial discharge detection method of a switch cabinet in the field of power grids. Background technique [0002] The insulation capacity of the switchgear is an important factor to determine the safe and stable operation of the switchgear. The insufficiency of field test methods for switchgear and the insulation failure of switchgear in operation seriously threaten the safe operation of the power system. Partial discharge detection is an effective means to reflect the insulation status of switchgear, and it is also a hot spot in current research. For the detection of partial discharge in switchgear, acoustic and electric wave detection equipment is commonly used at present, that is, ultrasonic sensors and ultra-high frequency current sensors are used to connect oscilloscopes, and oscilloscopes are connected to computers. Acoustic and electric wave detection equipment directly characterizes the intensity of partial discharge...

AI Technical Summary

Problems solved by technology

However, partial discharge is a weak electrical phenomenon, which is easily affected by external interference during the detection process. If the interference cannot be effectively identified and eliminated, it will be difficult to ensure the correctness and effectiveness of partial discharge data analysis.

In addition, the positioning function of the existing acoustic and electric detection equipment is simple, and it can only realize the rough positioning of the switchgear cabinet under the condition of a single discharge point. Reduce the effectiveness of positioning and the efficiency of maintenance

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