Title :
Analytical prediction of transient breakdown characteristics of SF 6 gas circuit breakers
Author :
Endo, F. ; Sato, M. ; Tsukushi, M. ; Yoshioka, Y. ; Saito, K. ; Hirasawa, K.
Author_Institution :
Hitachi Ltd. Res. Lab., Japan
fDate :
7/1/1989 12:00:00 AM
Abstract :
A study was conducted to estimate transient breakdown voltages ( VBDs) between contacts of a puffer-type SF6 gas circuit breaker. When contacts are opening, compressed gas is blasted between them by an insulating nozzle. The gas pressure fluctuates greatly in the contact region. The authors suggest that this pressure fluctuation causes transient VBDs. It is demonstrated that very accurate transient VBD characteristics can be calculated by combining the gas flow and electric field analyses and breakdown probability. The numerically calculated transient VBD characteristics agree fairly well with the transient recovery voltages during the capacitive current interruption
Keywords :
electric breakdown; electrical contacts; failure analysis; gas blast circuit breakers; sulphur compounds; transients; breakdown probability; capacitive current interruption; electrical contacts; gas flow; pressure fluctuation; puffer type SF6 gas circuit breakers; transient breakdown voltages; transient recovery voltages; Circuit breakers; Circuit testing; Contacts; Delay effects; Electric breakdown; Insulation; Signal generators; Sulfur hexafluoride; Transient analysis; Voltage;
Journal_Title :
Power Delivery, IEEE Transactions on
