Open AccessInfluence of trace H 2 O and O 2 on SF 6 decomposition products under arcing conditions in electric power equipment
Author(s) -
Yang Ren,
Xu Mengyuan,
Guan Chen,
Yan Jing,
Geng Yingsan
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8832
Subject(s) - decomposition , electric arc , circuit breaker , analytical chemistry (journal) , materials science , gas chromatography , sulfur hexafluoride , electrode , chemistry , electrical engineering , environmental chemistry , chromatography , organic chemistry , engineering
SF 6 has been widely used as an insulating and arc extinguishing medium in electric power equipments. Detection of gas decomposition products is an important means for condition monitoring and fault diagnosis. Trace H 2 O and O 2 have a significant influence on the species and concentrations of SF 6 decomposition products. It is important to explore the influence mechanism of trace H 2 O and O 2 on SF 6 decomposition products under arcing conditions. A series of SF 6 decomposition tests were carried out on a 40.5kV SF 6 circuit breaker, and a gas chromatograph and an electrochemical sensor were used to measure decomposed components. First, the H 2 O content remained constant, and the O 2 content and arcing energy changed in the tests. It has been found that the decomposition products of SF 6 are SOF 2 , SO 2 , CO, CO 2 , CF 4 , C 2 F 6 and C 3 F 8 . Then, the O 2 content remained constant, and the H 2 O content changed. The decomposition products are mainly SOF 2 , SO 2 , CO and CO 2 . Concentrations of all these decomposition products increase first and then tend to be stable slowly over time, but change differently with the increase of H 2 O and O 2 contents, because H 2 O and O 2 play different roles in the formation process of each decomposition characteristic components.