The space charge layer formed during point discharge process is not enough to prevent the leader from marching, and can not prevent the forming of upward leader, either.
人工尖端放电形成的空间电荷层既不足以阻止先导的继续推进，也不能防止产生上行先导。
2
A randomly stepped leader propagation model is proposed to investigate the gas discharge phenomena in SF6 circuit breaker.