基于光声光谱技术的SF6/N2故障分解气体检测中SF6含量对检测灵敏度的影响

doi:10.19595/j.cnki.1000-6753.tces.191193

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摘要由于各方面性能均衡,SF₆/N₂混合气体是目前替代SF₆气体的最佳选择之一,许多电力设备已经采用SF₆/N₂混合气体作为绝缘介质。电力公司的运检人员开始关注SF₆/N₂混合气体故障分解产物的检测问题,如采用现有的光声光谱仪器是否可以继续检测分解气体,检测灵敏度如何等。针对上述问题,该文首先从光声光谱基本原理出发,指出背景气体改变主要影响光声光谱系统的光声池常数,且随着混合气体中SF₆比例降低,光声池常数增大,有利于分解气体的检测。混合气体中SF₆比例从100%变为20%,光声池常数由168.7 Pa·cm/W增大至576.0 Pa·cm/W。然后搭建光声光谱实验平台,对比不同SF₆混合比条件下,SO₂、CO₂、CO、CF₄和SO₂F₂五种气体组分的最低检测限,实验结果与理论分析趋势一致,即SF₆气体比例越小,最低检测限越低,越容易检测。SF₆比例从100%变为30%,分解气体中CO₂最低检测限可由0.629×10^-4%减小至0.226×10^-4%。

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关键词 ：光声光谱, 光声池常数, 最低检测限, SF₆/N₂混合气体, 故障分解气体

Abstract：Due to the balanced performance of various aspects, SF₆/N₂ gas mixture is one of the best alternatives to SF₆ gas. Many power apparatuses have adopted SF₆/N₂ gas mixture as insulation medium. Therefore, the maintainers of the power company began to pay attention on the detection of the decomposition products of SF₆/N₂ gas mixture, such as whether the existing photoacoustic instruments can detect the decomposition gas, and how is the detection sensitivity? In view of the above problems this paper analyses the influence of background gas based on the basic principle of photoacoustic spectroscopy in the beginning. It is pointed out that the change of background gas mainly affects the photoacoustic cell constant of photoacoustic spectrometry system. With the decrease of SF₆ ratio in mixed gas, the photoacoustic cell constant increases, which is beneficial to gas detection. The ratio of SF₆ changed from 100% to 20%, the photoacoustic cell constant increased from 168.7Pa·cm/W to 576.0Pa·cm/W. Then a photoacoustic spectrometry experimental platform was built to compare the minimum detection limits of SO₂, CO₂, CO, CF₄ and SO₂F₂ under different SF₆ mixing ratios. The experimental results are consistent with the theoretical analysis. The smaller the ratio of SF₆ gas, the smaller the minimum detection limit and the easier it is to detect. The SF₆ ratio changed from 100% to 30%, the minimum detection limit of CO₂ in decomposition gas decreased from 0.629 ppm to 0.226 ppm.

Key words： Photoacoustic spectroscopy cell constant detection limit SF₆/N₂ gas mixture fault decomposition gas

收稿日期: 2019-09-17

PACS:	TM315
	TM595

基金资助:国家重点研发计划（2017YFB0902500）和国家电网有限公司科技项目（521205190014）资助

通讯作者: 李康男,1985年生,博士,助理研究员,研究方向为电气设备故障检测、状态监测等。E-mail：likang07@mail.iee.ac.cn

作者简介: 马凤翔男,1988年生,硕士,高级工程师,研究方向为GIS故障检测和GIS设备分解气体检测等。E-mail：njumfx@foxmail.com

引用本文:

李康, 马凤翔, 朱会, 朱峰, 韩冬. 基于光声光谱技术的SF₆/N₂故障分解气体检测中SF₆含量对检测灵敏度的影响[J]. 电工技术学报, 2020, 35(17): 3773-3780. Li Kang, Ma Fengxiang, Zhu Hui, Zhu Feng, Han Dong. Influence of SF₆ Concentration in SF₆/N₂ Gas Mixture on Decomposition Products Analysis Based on Photoacoustic Spectrometry Detection. Transactions of China Electrotechnical Society, 2020, 35(17): 3773-3780.

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