35kV架空线路引弧并联间隙的应用研究

Study and Application of Arc Ignition Parallel Gap in 35kV Overhead Transmission Line

为解决35kV架空线路因雷击造成的绝缘子损坏和导线断线等问题,对引弧并联间隙进行了分析研究,提出了相应的尺寸要求。大量的冲击和工频特性试验证明,引弧并联间隙能够有效保护绝缘子串和导线免于工频续流电弧的蚀烧。根据对线路雷击跳闸率的计算及现场应用情况,对雷害频繁的线路段,建议在原线路绝缘的基础上适当提高线路绝缘水平后,再加装引弧并联间隙。

In order to solve problems like insulator damage and conductor broken caused by lightning stroke in 35 kV overhead transmission line, the arc ignition parallel gap is analyzed and the dimension demand of the gap is proposed. It is proved by a large amount of lighting impulse and power frequency arcing tests that arc ignition parallel gap can effectively protect insulator and conductors from the ablation of power frequency arc caused by lightning stroke. Based on the calculation of trip-out rate of transmission line, it is suggested that if the transmission line is in the region of high frequency rate of lightning stroke, the insulator level of the line should have been strengthened before arc ignition parallel gaps is installed.