Partial discharge transient earth voltage sensor

Abstract

The invention discloses a partial discharge transient earth voltage sensor. The partial discharge transient earth voltage sensor comprises a casing body, a flat-panel coupling capacitor inner electrode, a power frequency isolating circuit, an acquisition control module, an output interface and a cover plate, wherein the casing body and the cover plate form a seal cavity together; the flat-panel coupling capacitor inner electrode is fixed in the seal cavity and forms a coupling capacitor with the metal surface of a sample to be detected with the left side wall of the casing body as a medium; the power frequency isolating circuit is used for performing high-pass filtering on signals detected by the flat-panel coupling capacitor inner electrode; the output interface is used for outputting signals filtered by the power frequency isolating circuit; and the acquisition control module is used for controlling the flat-panel coupling capacitor inner electrode and the output interface. The partial discharge transient earth voltage sensor is simple and rapid in operation, convenient to move frequently and position fine during routing inspection, high in anti-jamming capacity and capable of improving the detection working efficiency and the positioning accuracy.

Description

technical field [0001] The invention relates to a transient ground voltage sensor for partial discharge, which is a device for collecting and detecting the transient ground voltage generated on the surface of the cabinet due to partial discharge in a medium and high voltage switch cabinet in operation, and belongs to online state detection technology. Background technique [0002] The safety of high-voltage electrical equipment has always been the most concerned issue of the power grid, and the degree of partial discharge is one of the important indicators to measure the insulation aging of high-voltage electrical equipment. [0003] When partial discharge occurs in high-voltage electrical equipment, the discharge electricity first gathers in the grounded metal part adjacent to the discharge point, forming a current pulse and propagating in all directions; when internal discharge occurs in high-voltage electrical equipment, the discharge electricity gathers in the grounding ...

AI Technical Summary

Problems solved by technology

[0005] Ultrasonic method has two kinds of probes that can collect ultrasonic signals: one is contact ultrasonic probe, its disadvantage is that in addition to partial discharge, there are many other factors that may cause the shell to vibrate, and the interference of these other factors is also possible Very strong; the other is a non-contact ultrasonic probe, the disadvantage of which is that it is easily affected by environmental factors

[0006] The most commonly used electrical detection method is the TEV (Transient Earth Voltage) probe, which is fixed on the switchgear cabinet through a magnetic base or smeared with a couplant. There is no acquisition control function on the probe, and the inspection operation is not easy enough

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