GIS (gas insulated switchgear) breakdown flashover fault gas chamber positioning method and instrument

Abstract

The invention discloses a GIS (gas insulated switchgear) breakdown flashover fault gas chamber positioning method and an instrument. According to a GIS structure and sound wave propagation features when flashover happens, a GIS flashover positioning and detecting system is designed. The system is composed of a series of independent sound intensity detectors, each detector detects the sound intensity of a corresponding GIS gas chamber, and through comparing the sound intensity value of each gas chamber, the gas chamber where flashover happens is positioned. Each detector is composed of a sensor module, a data acquisition module, a signal processing module, an effective value display module, an alarm display module, a power management module and other modules, wherein the sensor module converts sound signals from the GIS gas chamber into electric signals and sends the electric signals to the data acquisition module for conditioning such as amplifying and filtering; the signal processing module completes signal A / D conversion and data processing; the effective value display module displays a voltage value corresponding to the sound signals; the alarm display module gives an alarm signal when sound pressure signals of the gas chamber exceed a set value; and the power management module provides power for the system.

Description

technical field [0001] The application of the present invention relates to a method and an instrument for locating gas chambers of gas-insulated switchgear breakdown flash-flash faults, and specifically relates to a method for locating breakdown flash-flash faults by detecting the sound intensity of all gas chambers of gas-insulated switchgear Gas cell methods and apparatus. Background technique [0002] Today, sulfur hexafluoride (SF 6 ) Closed combined electrical equipment, known internationally as "Gas Insulated Switchgear" (Gas Insulated Switchgear) referred to as GIS, each interval of GIS is divided into several independent SF 6 Air chambers, that is, air separation units, each independent air chamber communicates with each other on the circuit, but is isolated from each other on the air circuit. Because GIS has the advantages of small size, light weight, good safety, high reliability, and can be used under harsh environmental conditions, it is more and more widely us...

AI Technical Summary

Problems solved by technology

Since the sound propagates in the metal cylinder wall after GIS breakdown flashover, and due to individual differences in human hearing, it is difficult to accurately determine which air chamber has breakdown flashover

However, the GIS ultrasonic partial discharge detector is used to test point by point during the pressurized aging stage. Due to the short pressure resistance time, it is impossible to measure each gas chamber in time.

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