Open AccessFeature extraction of SF 6 thermal decomposition characteristics to diagnose overheating fault
Author(s) -
Tang Ju,
Pan Jianyu,
Yao Qiang,
Miao Yulong,
Huang Xiujuan,
Zeng Fuping
Publication year - 2015
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.2014.0308
Subject(s) - overheating (electricity) , thermal decomposition , thermal , materials science , fault (geology) , sulfur hexafluoride , thermal analysis , thermodynamics , engineering , chemistry , electrical engineering , physics , geology , organic chemistry , seismology
This study examines how byproducts from thermal decomposition of sulfur fluoride (SF 6 ) can be measured and applied to diagnose an overheating fault occurring in SF 6 insulated equipment. Using a series of experiments performed on a SF 6 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(SO 2 )/C(SO 2 F 2 ) and C(SO 2 F 2 +SOF 4 )/C(SOF 2 ) 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.