10 kV绝缘导线防断线用避雷器串联羊角间隙的距离确定方法

Study on the distance determination method of angle gap in series with an anti-break lightning arrester for 10 kV insulated wires

通过分析架空输电线路雷击断线机理,设计一种由避雷器与羊角间隙串联的保护装置。羊角间隙与绝缘导线穿刺连接,当出现直击雷或感应雷时,先羊角间隙进行放电,通过避雷器将雷电能量泄入大地,抑制工频续流。因羊角间隙能稳定可靠地转移电弧弧根至羊角端的燃弧间隙,保证放电间隙表面不受电弧的灼烧而变形,既有效地提高了放电电压的稳定性,又避免了绝缘导线烧损而断线。同时,考虑间隙放电电压的不稳定性,提出基于正态分布的带间隙避雷器的间隙距离确定方法,通过雷电冲击放电试验和数据处理分析,得到高压穿刺电极的安装位置与间隙距离,避免了绝缘导线因雷击而发生断线故障。

By analyzing the breakage mechanism of overhead transmission lines under lightning, a protective device constitute by a lightning arrester and a horn gap is designed. The horn gap is punctured to connect with the insulated conductor. When a direct lightning or an induced lightning overvoltage strikes, the horn gap breakdown primarily The lightning energy is then released into the earth through the arrester to restrain the continuous current. The horn gap can transfer the arc root into the arcing gap of horn to avoid its surface distort caused by the arc burning, which ensures the safety of horn gap surface..This device effectively improves the stability of discharge voltages and avoids the wire break failures. In addition, a method is proposed to determine the gap distance of arrester with band gap based on the normal distribution. Finally, the lightning impulse tests is practiced and the experiment data are analyzed to obtain the installation position of puncture electrode to avoid the break-line fault.