用于35kV架空线路复合绝缘子串的引弧并联间隙的研究

Study on the Arc Ignition Parallel Gap which Used in Composite Insulator String of 35 kV Overhead Transmission Lines

针对35 kV架空线路因雷击造成的复合绝缘子损坏和导线断线等问题,进行了引弧并联间隙的研究,提出了引弧并联间隙的尺寸要求。大量的冲击和工频特性试验表明,引弧并联间隙能够有效保护复合绝缘子串和导线免受工频续流电弧的蚀烧;计算了线路的雷击跳闸率,建议在原线路绝缘的基础上适当提高线路绝缘距离后,再加装引弧并联间隙。

For solving the problems of the damages of both composite insulator string and conductors which caused by lightning stroke in 35 kV overhead transmission lines, arc ignition parallel gap is studied, and the dimension demand of arc ignition parallel gap is proposed, the results of lots of lighting impulse and power frequency arcing tests show that arc ignition parallel gao can effectively make composite insulators and conductors exclusive from ablation of power frequency arc caused by lightning stroke; By calculating the trip-out rate of transmission line, it is suggested to increase line insulation distance on the basis of the original line insulation before retrofitting arc ignition parallel gap.