SF6 decomposition component gas detection method and device based on photoacoustic spectrometry
A technology for decomposing components and photoacoustic spectroscopy, which is used in measurement devices, material analysis by optical means, and material analysis. It can solve problems such as noise interference, low sensitivity, and inability to achieve online detection, and reduce noise interference. , high sensitivity, low cost effect
Pending Publication Date: 2022-02-01
STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH
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However, most of the above methods are not sensitive or cannot realize online detection and are susceptible to noise interference.
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only some embodiments of the present invention, not all embodiments. Based on the spirit of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all belong to the protection scope of the present invention.
[0034] The present invention utilizes the method of difference, has designed a kind of device that is used for detecting its decomposition product SO2F2 and SOF mixed gas of detecting under SF6 background gas, as figure 1 As shown, the device includes: an air inlet and outlet unit, a laser light source 8 , a pressure gauge 6 , a light concentrating unit, a resonant photoacoustic p...
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The invention relates to an SF6 decomposition component gas detection method and device based on photoacoustic spectrometry. According to the device, a photoacoustic cell is divided into two uniform parts, pure SF6 gas is introduced into the left half part of the interior of the photoacoustic cell, a to-be-detected gas sample is introduced into the right half part of the interior of the photoacoustic cell, a light source enters the photoacoustic cell through a light gathering unit, an acoustic resonant cavity is in resonance with a signal of the light source, a quartz tuning fork is used for collecting a signal to be detected, and the two types of signals are input into a differential amplification circuit, differentiated and then input into a computer to obtain the concentration of SF6 decomposition component gas. According to the invention, by using a differential method, the noise interference around the experiment can be greatly reduced, and the sensitivity is high. A wave trap is designed at the air inlet, so that noise interference of air flow can be effectively reduced. The quartz tuning fork is used as a material for detecting photoacoustic signals, is low in cost, can be recycled and has great development potential.
Description
technical field [0001] The invention relates to the field of fault diagnosis and evaluation of electrical equipment, and more specifically, to a method and device for decomposing component gases of SF6 based on photoacoustic spectroscopy. Background technique [0002] SF6 is currently known as the most excellent gas insulation medium, with extremely excellent insulation, arc extinguishing performance and physical and chemical properties. However, studies have shown that when insulation faults such as partial discharge, spark discharge, arc discharge, and local overheating occur inside SF6 gas-insulated electrical equipment, SF6 gas will decompose to a certain extent and generate various low-fluorine sulfides such as SOF2 and SO2F2. Existing studies have shown that the decomposition of SF6 caused by different types of insulation faults has different components and component contents, and the decomposition amount of SF6 gas is also related to the severity of the fault. Therefo...
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IPC IPC(8): G01N21/17
CPCG01N21/1702
Inventor 卞超张正东李东风谭婷月朱胜程骏陈轩甘强孙超陶加贵陈少波赵科胡成博
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH