气吹弧装置仿真与试验研究

Simulation and Experimental Research on Air-blowing Arc Device

摘要:

并联间隙雷击闪络后能快速疏导电弧保护绝缘子，但无法有效切除后续工频续流。因此，基于“气吹弧”思想研究设计了一种应用于高压输电线路的气吹弧装置。该装置与绝缘子串并联安装，当雷击线路时利用绝缘配合先于绝缘子击穿闪络泄放雷电流入地，并同时利用雷电脉冲信号触发灭弧气丸产生高速气流，能够在继电保护装置最快响应动作前熄灭电弧。通过仿真在理想状态下得出该装置能够在4 ms内将20 kA的工频续流熄灭；通过试验得出该装置能够在2.6 ms内将5.1 kA的续流电弧熄灭。仿真与试验结果基本一致，共同验证了所设计气吹弧装置具有良好的灭弧效果。

Abstract:

After the lightning flashover in parallel gaps, the insulator can be protected while the arc being dredged quickly, but it cannot effectively cut off the subsequent power frequency follow current. Therefore, based on the concept of "gas blowing arc", a kind of gas-blowing arc device is designed for HV transmission lines. The device is installed in parallel with the insulator string, and when lightning strikes the line, the gap uses insulation coordination to discharge lightning current into the ground before the insulator breakdown and flashover, and at the same time, with the usage of lightning pulse signal, the arc extinguishing gas pill is triggered to generate high-speed airflow. In this way, the arc can be extinguished before the work of relay protection device. Under ideal conditions, the simulations show that the device can extinguish 20 kA power frequency follow current within 4 ms, and the experiments show that the device can extinguish 5.1 kA power frequency follow current arc within 2.6 ms. The results of simulations and experiments are basically consistent, which jointly verify that the air-blowing arc device has good arc extinguishing effect.