Overhead line partial discharge positioning device and method based on ultrasonic array

Abstract

The invention discloses an overhead line partial discharge positioning device and method based on an ultrasonic array. By means of the ultrasonic sensor array, ultrasonic signals of the same ultrasonic signal source at multiple sensor positions can be collected, and then subsequent analysis can be conducted according to the positions of different sensors and the strength of the collected ultrasonic signals, so that the positioning purpose is achieved. The device comprises an ultrasonic sensor, an ultrasonic detection conditioning filtering shaping circuit, an analog-to-digital conversion circuit and an ARM processor. When the device works, the ultrasonic array surface on the ground is arranged towards the overhead line, eight ultrasonic sensors on the device can collect ultrasonic signalsof partial discharge in the overhead line. Through a multiplexing scheme, sixteen times of acquisition at the same position are realized, the acquired ultrasonic signals are subjected to characteristic frequency selection, filtering and shaping of a subsequent conditioning circuit to obtain the ultrasonic signal intensity at each ultrasonic sensor, and the data information can be subjected to numerical calculation through an ARM, so that the position of the partial discharge ultrasonic source is obtained through analysis.

Description

technical field [0001] The invention belongs to the technical field of insulation state detection of electric power equipment, and in particular relates to a partial discharge positioning device and a positioning method applied to 10kV overhead insulated lines and equipment along the lines. Background technique [0002] As the most common transmission line in my country's 10kV distribution network, overhead insulated lines are widely used in both urban and rural areas. Since overhead lines often need to pass through urban roads or forested areas between farmlands, during long-term operation, due to the deterioration of utility pole insulators or the existence of tree branch friction, abnormal discharges will gradually occur in overhead lines, and these discharge points will be reduced. The insulation level of the line and may cause a blackout. In order to solve this problem, the ultrasonic testing method was proposed to detect partial discharge in overhead insulated lines, ...

AI Technical Summary

Problems solved by technology

[0006] The invention provides an overhead line partial discharge positioning device and positioning method based on an ultrasonic array, which can efficiently and quickly locate the insulation defects of 10kV overhead insulated lines and equipment along them, and solve the current inspection process of 10kV overhead insulated lines The difficulty of accurately and quickly determining the location of partial discharge in the

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