Open AccessUltraviolet differential spectroscopy quantitative analysis of SF 6 decomposition component SO 2
Author(s) -
Zhang Xiaoxing,
Xiao Hanyan,
Li Xin,
Zhang Jun
Publication year - 2018
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2017.0225
Subject(s) - analytical chemistry (journal) , materials science , absorption spectroscopy , spectral line , absorption (acoustics) , ultraviolet , spectroscopy , optics , chemistry , optoelectronics , physics , chromatography , quantum mechanics , astronomy , composite material
SO 2 is a symbolic gas that can indicate the insulation status of SF 6 insulation electrical equipment. Its accurate quantitative measurement is of the great significance for the judgement of the type and severity of faults inside the insulation equipment. For this reason, a detection system of trace SO 2 based on ultraviolet (UV) spectrometry was presented. The measured UV absorption spectra of SO 2 were processed using the wavelet analysis to remove useless spectra information and get the UV differential absorption spectra of SO 2 . The fast Fourier transform (FFT) was used to analyse UV differential spectra in the band of 190–230 and 290–310 nm and extract the feature information. The results show that there is a good linear relationship between the FFT characteristic peak value and the concentration of trace SO 2 in the two wave bands. The detection limit in the band of 190–230 nm was even lower than that in the band of 290–310 nm. Besides, the differential absorption cross section of SO 2 decreases with the increase of temperature. The study has laid a foundation for the application of the UV differential absorption spectroscopy in the online monitoring and fault diagnosis of SF 6 insulation electrical equipment.