TY - GEN
T1 - Breakdown electric field calculation of hot SF6 and its application to high voltage circuit breakers
AU - Li, Xingwen
AU - Zhao, Hu
AU - Jiang, Xu
AU - Jia, Shenli
AU - Wang, Qian
PY - 2012
Y1 - 2012
N2 - The calculation of the critical electric field strength Ecr of hot SF6 is important for a compact circuit breaker design. First, the reduced critical electric field strength (E/N)cr is obtained for 2, 4 and 8atm respectively, and for the temperature range of 300 to 3000K, by solving the Boltzmann equation. Then the variation of Ecr with pressure and temperature is derived from the corresponding (E/N)cr data of SF6. It is found that the pressure effect could not be neglected to predict the Ecr by comparison of the calculation results of Ecr at 8atm using the (E/N)cr data of 8atm and 2atm, where the maximum deviation is above 50%. Finally, the calculation results of Ecr are used to evaluate the dielectric breakdown strength of a puffer type high voltage SF6 circuit breaker by comparing the ratio of applied electric field strength Ea and Ecr. It demonstrates that the analysis results can provide an indicator for the probable breakdown areas inside the arc quenching chamber.
AB - The calculation of the critical electric field strength Ecr of hot SF6 is important for a compact circuit breaker design. First, the reduced critical electric field strength (E/N)cr is obtained for 2, 4 and 8atm respectively, and for the temperature range of 300 to 3000K, by solving the Boltzmann equation. Then the variation of Ecr with pressure and temperature is derived from the corresponding (E/N)cr data of SF6. It is found that the pressure effect could not be neglected to predict the Ecr by comparison of the calculation results of Ecr at 8atm using the (E/N)cr data of 8atm and 2atm, where the maximum deviation is above 50%. Finally, the calculation results of Ecr are used to evaluate the dielectric breakdown strength of a puffer type high voltage SF6 circuit breaker by comparing the ratio of applied electric field strength Ea and Ecr. It demonstrates that the analysis results can provide an indicator for the probable breakdown areas inside the arc quenching chamber.
KW - MHD
KW - SF6
KW - arc
KW - breakdown electric field
KW - high voltage circuit breaker
UR - https://www.scopus.com/pages/publications/84870309149
U2 - 10.1109/HOLM.2012.6336558
DO - 10.1109/HOLM.2012.6336558
M3 - 会议稿件
AN - SCOPUS:84870309149
SN - 9781467307819
T3 - Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts
BT - Proceedings of the 58th IEEE Holm Conference on Electrical Contacts, HOLM 2012
T2 - 58th IEEE Holm Conference on Electrical Contacts, HOLM 2012
Y2 - 23 September 2012 through 26 September 2012
ER -