新型约束空间灭弧防雷间隙研究

Study on New Type of Constraint Space Arc Extinguishing Gap of Lightning Protection

喷射气体灭弧防雷间隙能在绝缘子发生雷击闪络造成单相接地故障时快速输导雷电流入地,同时启动高速气流灭弧装置,熄灭故障点工频续流,抑制间歇性电弧产生和过电压。通过雷电冲击试验、工频电弧试验,证明约束空间灭弧间隙能迅速地将工频电弧熄灭,避免工频电弧灼烧绝缘子以及线路断线的风险。新型灭弧防雷间隙具有动作时间短,喷射气流压强高,速度快,间隙间介质强度恢复迅速等特点,能够强效抑制工频电弧,大幅降低线路雷击跳闸率。

When the single-phase ground fault caused by lightning flashover of insulator happened, the gas blowing air extinguishing gap of lightning protection can rapidly lead lightning current to the ground and startup at the same time the high Speed gas blowing arc extinguishing device to extinguish power-flow current at the fault point and inhibit the intermittent arc and overvoltage. The lightening impulse test and power frequency arc test prove that the constraint space arc extinguishing gap can extinguish power frequency arc rapidly, and avoid the burning of insulators by the arc and the risk of hne broken. The new type gap has characteristics of high gas blowing pressure ＆ speed, and rapid recovery of the gap dielectric strength, which can inhibit power frequency arc effectively and reduce greatly the lightning trip-out rate.