On-line monitoring system and method of decomposed gas components in sf6 electrical equipment

Abstract

The invention discloses an on-line monitoring system and a method for SF6 decomposition gas components in electrical equipment. The system and the method adopt photoacoustic spectrometry to overcome the problem of application of on-line monitoring of a plurality of SF6 gas decomposition components in the electrical equipment, and achieve on-line monitoring for a plurality of SF6 decomposition gas components during electrical equipment failure. The system and the method have characteristics of capability of simultaneously monitoring the plurality of decomposition gas components, high anti-interference capability, high detection accuracy, high precision, simple subsequence maintenance, and the like.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of high-voltage electrical equipment, in particular to a SF 6 A system and method for on-line monitoring of decomposed gas components in electrical equipment. Background technique [0002] SF 6 The gas has excellent insulating properties and is widely used in high-voltage electrical equipment. SF in action 6 Due to various internal defects in electrical equipment during manufacturing, installation and operation, discharge (arc discharge, spark discharge, corona or partial discharge) and overheating failures occur, resulting in SF 6 The gas decomposes to generate various gas components, mainly SF 4 , SOF 2 , SO 2 f 2 , SOF 4 , SO 2 , CO, H 2 S, HF and CF 4 wait. For electrical equipment in operation, analyze and detect SF 6 The decomposition products of gas are used to judge SF 6 A powerful method for the internal operation of gas-insulated equipment. Off-line detection and...

AI Technical Summary

Problems solved by technology

[0005] (1) The filter mainly uses coating technology to selectively transmit infrared light. When the filter is used to select the wavelength of infrared light, the transmitted infrared light If the width is wider, it will cause cross interference, and the data needs to be processed twice, which is not conducive to rapid on-site detection

[0006] (2) The mechanical noise caused by the rotation of the mechanical chopper has the same frequency as the photoacoustic signal, which increases the system noise of photoacoustic detection and produces acoustic disturbance in the air The vibration of the chopping frequency and the chopping frequency cause the fluctuation of the acoustic signal, and its frequency is related to the frequency of the photoacoustic signal, and the disturbance noise increases rapidly with the increase of the chopping frequency. These factors seriously affect the detection signal-to-noise ratio of the photoacoustic signal, thereby reducing the Improved detection sensitivity for gas components

[0007] (3) The system cannot be directly connected to the GIS device. When testing, it is necessary to take out the gas in the GIS device with a sampling cylinder or a gas sampling bag and inject it into the light source. In the acoustic spectrum detection device, the complexity of the detection is increased, and the online monitoring of the equipment cannot be realized. It not only needs to consume SF6 gas, but also causes the external Row

[0009] (1) The filter mainly uses coating technology to selectively transmit infrared light. When the filter is used to select the wavelength of infrared light, the transmitted infrared light Wider width will cause cross-interference. Although methods such as support vector machines are used to reduce the influence of cross-interference, the influence of cross-interference has not been fundamentally overcome.

[0010] (2) Using a chopper to adjust the light does not solve the noise interference generated by the chopper

[0011] (3) It cannot be directly connected to the GIS device for gas detection, and online monitoring cannot be realized, and SF6 gas will be lost and efflux to environmental issues

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