Infrared Spectral Characteristics and Mixing Ratio Detection Method of a New Environmentally Friendly Insulating Gas C5-PFK
LI Xiao-dian1, TANG Nian1, ZHANG Man-jun1, SUN Dong-wei1, HE Shu-kai2, WANG Xian-zhong2, 3, ZENG Xiao-zhe2*, WANG Xing-hui2, LIU Xi-ya2
1. Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China
2. Henan Relations Co., Ltd., Zhengzhou 450001, China
3. School of Physics, Zhengzhou University, Zhengzhou 450001, China
Abstract：1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (C5-PFK) gas has attracted widespread attention at home and abroad due to its excellent electrical insulation properties and good environmental protection properties. Preparing high-precision C5-PFK mixed gas and accurately detecting the mixing ratio is conducive to the scientific demonstration of C5-PFK mixed gas and minimizes potential power hazards. The FTIR experiment, combined with the B3LYP method for spectral theoretical calculation, was used to study the infrared spectral absorption characteristics of C5-PFK gas. For CO2 and micro-water gas that may exist in the test environment, the cross-interference analysis of spectral lines was carried out under the same conditions as temperature, pressure and optical path; The C5-PFK gas mixture ratio sensor was simulated and tested based on NDIR technology, and the overall design of the sensor hardware system was carried out. According to the output characteristics of the sensor, a BP neural network temperature compensation model is established, and the repeatability and indication error of the sensor are tested. The results show that the strong absorption peak positions of C5-PFK gas are 1 200, 1 262 and 1 796 cm-1, respectively, and the molecular theoretical calculation agrees with the gas's measured infrared spectrum. Under the background of synthetic air, the absorbance of CO2 gas at 1 262 cm-1 position is 6.04×10-7, the influence factor of micro water peak area in 150 nm filter bandwidth is about 3.15×10-3, and the cross-interference of spectral lines can be ignored. It is feasible to realize mixing ratio detection at a 1 262 cm-1 position. The range tracks the optical path, and the sensor simulation test results show that the 6.5 mm optical path can realize the detection of the C5-PFK mixture ratio of 0~15%. The output characteristics of the sensor show that the value of the absorption variable SA/SB decreases with the increase in temperature, showing a nonlinear relationship. The maximum indication error of 10% C5-PFK/Air mixture before and after temperature compensation by the BP neural network algorithm is 29.23% and 1.29%, respectively, and the output absorption variable SA/SB value remains unchanged after compensation. The sensor repeatability test shows that the RSD is 0.27%, less than 3%. The linear fitting coefficient R2 of the sensor indication corresponding to different concentrations is 0.999, and the maximum indication error is 2.47%. In summary, the advantages of the detection method and its sensor in the detection range of C5-PFK gas mixture ratio, anti-interference ability and reliability are verified, and a feasible solution for detecting the mixture ratio of C5-PFK gas mixture electrical equipment is provided.
黎晓淀，唐 念，张曼君，孙东伟，赫树开，汪献忠，曾晓哲，王幸辉，刘西亚. 新型环保绝缘气体C5-PFK的红外光谱特性及混合比检测方法研究[J]. 光谱学与光谱分析, 2023, 43(12): 3794-3801.
LI Xiao-dian, TANG Nian, ZHANG Man-jun, SUN Dong-wei, HE Shu-kai, WANG Xian-zhong, ZENG Xiao-zhe, WANG Xing-hui, LIU Xi-ya. Infrared Spectral Characteristics and Mixing Ratio Detection Method of a New Environmentally Friendly Insulating Gas C5-PFK. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3794-3801.
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