Research of cold rate of rise of dielectric strength of SF6 circuit breaker

This paper is connected with investigation of cold rate of rise of electric strength of 525 kV SF₆ live tank circuit breaker. The article describes controlled opening during opening operation of puffer SF₆ Circuit Breaker. The method gives the real estimation of gas flow influence to dynamic breakdown characteristic of puffer interrupter. The purpose of this article is to give the correlation between breakdown voltage characteristic and opening speed of circuit breaker as well from changing of filling pressure value.