Device and method for positioning partial discharge of high-voltage equipment through oscilloscope

Abstract

The invention discloses a device and method for positioning partial discharge of high-voltage equipment through an oscilloscope. The device comprises two or more sensors. The sensors are an ultrahigh-frequency sensor / sensors and / or an ultrasonic sensor / sensors. Every two sensors are connected with a signal conditioning unit which is further connected to the oscilloscope. The sensors receive ultrahigh-frequency signals / ultrasonic signals caused by the partial discharge; the oscilloscope displays the ultrahigh-frequency signals / ultrasonic signals and displays the difference of the time when a discharge signal arrives at two sensors, and the signal conditioning unit figures out the distances between a discharge point and the sensors. According to the device and the method, the partial discharge of the high-voltage equipment can be effectively positioned, the difference of time when the partial discharge arrives at both / all the sensors is effectively measured, and the distances between the discharge point and the sensors are figured out according to propagation velocity. Accordingly, the high-voltage equipment can be overhauled in a goal-directed mode.

Description

technical field [0001] The invention relates to the field of electricity, and more specifically relates to a device and method for locating partial discharge of high-voltage equipment by using an oscilloscope. Background technique [0002] Under normal circumstances, the insulation performance of power equipment operating in the grid can withstand the operating voltage. Due to the influence of manufacturing and installation processes, there may be bubbles, impurities, cracks, etc. inside the insulation of electrical equipment. Under the action of high-voltage alternating electric field, the electric field strength inside or on the surface will be too high, and periodic partial discharge will occur inside the insulation. . Partial discharge is generally divided into internal discharge, surface discharge, corona discharge and levitation discharge. Because its discharge energy is very small, it will not break down the entire path in a short time, but it can reduce the insulat...

AI Technical Summary

Problems solved by technology

Because its discharge energy is very small, it will not break down the entire path in a short time, but it can reduce the insulation performance and even lose the withstand voltage performance.

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