Feature extraction of SF6 thermal decomposition characteristics to diagnose overheating fault. Issue 6 (1st September 2015)

• Record Type: Journal Article
• Authors: Tang, Ju; Pan, Jianyu; Yao, Qiang; Miao, Yulong; Huang, Xiujuan; Zeng, Fuping
• Is Part Of: IET science, measurement & technology. Volume 9:Issue 6(2015)
• Page Start: 751
• Page End: 757
• Publication Date: 2015-09-01
• Subjects: feature extraction -- pyrolysis -- fault simulation -- SF6 insulation -- sulphur compounds; feature extraction -- SF6 thermal decomposition characteristics -- overheating fault -- formation rate -- SF6 thermal fault simulation system -- fault temperature -- IEC standard 60480‐2004 -- thermal correlation ratio -- SF6; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2014.0308
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : This study examines how byproducts from thermal decomposition of sulfur fluoride (SF6 ) can be measured and applied to diagnose an overheating fault occurring in SF6 insulated equipment. Using a series of experiments performed on a SF6 thermal fault simulation system, the thermal decomposition characteristics of SF6 were obtained for temperatures below 400°C. Based on these results, the formation rate was extracted to indicate the progress of the thermal fault's development, and the characteristic component ratio was used to identify the type and severity of the thermal fault. The relationship of the fault temperature and the formation rate along with the correlation between the characteristic ratio and the fault temperature were studied. The results show that: the formation rate of the components effectively reflects the severity and development trend of the thermal fault; by integrating the IEC standard 60480‐2004, the obtained thermal fault maximum safe time (TMS) can accurately indicate the largest safe time when thermal fault happens; component characteristic ratios C(SO2 )/C(SO2 F2 ) and C(SO2 F2 +SOF4 )/C(SOF2 ) can be used to evaluate whether the fault type is a thermal fault; and the thermal correlation ratio (TR) can be employed to recognize the temperature value from 300°C to 400°C.