Partial discharge test system with T-shaped structure for gas insulated switchgear under impulse voltages

Abstract

The invention discloses a partial discharge test system with a T-shaped structure for gas insulated switchgear under impulse voltages. The partial discharge test system comprises an impulse voltage generator, a high-voltage conducting wire, a sleeve, a GIS (gas insulated switchgear) shell, a GIS conducting rod section a, a GIS conducting rod section b, a spherical electrode, a spherical electrodewith tip defects, a conducting rod section a ultrahigh-frequency sensor, a conducting rod section b ultrahigh-frequency sensor, a conducting rod section a basin-type insulator, a conducting rod section b basin-type insulator and an oscilloscope, and is characterized in that the partial discharge test system is of the T-shaped structure, voltages can be simultaneously applied to the electrode withthe defects and the electrode without defects, partial discharge can be measured, two channels of signals can be compared with each other, accordingly, accurate partial discharge signals can be obtained, external disturbance can be prevented, and the detection accuracy can be improved. The partial discharge test system has the advantages that the T-shaped GIS cavity structure is utilized, the partial discharge test system comprises the two electrodes, the signals can be measured by the aid of the ultrahigh-frequency sensors, the two channels of signals can be compared with each other, the partial discharge signals can be detected, and accordingly the detection sensitivity can be greatly improved.

Description

Technical field: [0001] The invention relates to the field of electrical equipment testing, in particular to a partial discharge test system for gas combined electrical appliances based on a T-shaped structure under impulse voltage. Background technique [0002] Gas Insulated Switchgear (GIS) is a key equipment in the power grid, which has the characteristics of low maintenance and high operational reliability. GIS equipment will suffer from lightning overvoltage during operation. Lightning overvoltage is an overvoltage naturally formed in nature, which has the characteristics of high amplitude and steep wave front. In addition, GIS will be subjected to overvoltage during operation. [0003] The on-site impulse withstand voltage test of GIS is now a relatively common test item. Through the on-site impulse withstand voltage test, some defects that cannot be found in the power frequency withstand voltage test can be found, which is of great significance to ensure the safe operation...

AI Technical Summary

Problems solved by technology

The difficulty in the detection of partial discharge under impulse voltage lies in the suppression of interference. Since the impulse voltage generator itself uses ball gap discharge to generate waveforms, it has a great impact on the accuracy of detection, which also makes it difficult to study the partial discharge of GIS under impulse voltage. Discharge characteristics

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