Early Warning for Various Internal Faults of GIS Based on Ultraviolet Spectroscopy
ZHAO Yu1, WANG Xian-pei1, HU Hong-hong2, DAI Dang-dang1, LONG Jia-chuan1, TIAN Meng1, ZHU Guo-wei1, HUANG Yun-guang3
1. School of Electronic Information, Wuhan University, Wuhan 430072, China 2. Shenzhen Power Supply Bureau Company, Limited, Shenzhen 518001, China 3. Guangxi Grid Electric Power Research Institute, Nanning 530015, China
Abstract：As the basis of accurate diagnosis, fault early-warning of gas insulation switchgear (GIS) focuses on the time-effectiveness and the applicability. It would be significant to research the method of unified early-warning for partial discharge (PD) and overheated faults in GIS. In the present paper, SO2 is proposed as the common and typical by-product. The unified monitoring could be achieved through ultraviolet spectroscopy (UV) detection of SO2. The derivative method and Savitzky-Golay filtering are employed for baseline correction and smoothing. The wavelength range of 290～310 nm is selected for quantitative detection of SO2. Through UV method, the spectral interference of SF6 and other complex by-products, e.g. SOF2 and SOF2, can be avoided and the features of trace SO2 in GIS can be extracted. The detection system is featured by compacted structure, low maintenance and satisfactory suitability in filed surveillance. By conducting SF6 decomposition experiments, including two types of PD faults and the overheated faults between 200～400 ℃, the feasibility of proposed UV method has been verified. Fourier transform infrared spectroscopy and gas chromatography methods can be used for subsequent fault diagnosis. The different decomposition features in two kinds of faults are confirmed and the diagnosis strategy has been briefly analyzed. The main by-products under PD are SOF2 and SO2F2. The generated SO2 is significantly less than SOF2. More carbonous by-products will be generated when PD involves epoxy. By contrast, when the material of heater is stainless steel, SF6 decomposes at about 300 ℃ and the main by-products in overheated faults are SO2 and SO2F2. When heated over 350 ℃, SO2 is generated much faster. SO2 content stably increases when the GIS fault lasts. The faults types could be preliminarily identified based on the generation features of SO2.
赵 宇1，王先培1，胡红红2，代荡荡1，龙嘉川1，田 猛1，朱国威1，黄云光3. 基于紫外光谱检测的GIS内多类故障早期预警[J]. 光谱学与光谱分析, 2015, 35(02): 438-442.
ZHAO Yu1, WANG Xian-pei1, HU Hong-hong2, DAI Dang-dang1, LONG Jia-chuan1, TIAN Meng1, ZHU Guo-wei1, HUANG Yun-guang3. Early Warning for Various Internal Faults of GIS Based on Ultraviolet Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(02): 438-442.
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