Lightning protection of multi‐fracture arc‐quenching lightning protection gap for 35 kV distribution lines

Abstract

Abstract Owing to the low insulation level of 35 kV distribution lines, lightning outage accidents and huge economic losses occur frequently. Therefore, a multi‐fracture arc‐quenching lightning protection gap (MFALPG) for 35 kV distribution lines is developed to ensure the safety and stability of power supply. Here, the principle of MFALPG is presented through the electromagnetic self‐contraction effect and qualitative modelling theory. In order to investigate the coupling effect between high‐energy compressional waves and arcs, a mathematical model of airflow coupled arc was developed to simulate and analyse the arc‐quenching process. Theoretical analysis and simulation results show that the high‐energy compressional wave is triggered by the impulse arc rapidly, and the arc conductivity drops abruptly in a short time. Finally, a lightning impulse discharge test and the power frequency withstand voltage test are performed to determine the 35 kV power frequency continuous current interruption test parameters. Under the action of the MFAPLG, the entire time of arc duration is less than 3 ms, and reignition phenomenon of the arc is not found after the subsequent power frequency voltage is restored.

Keywords

• Power transmission, distribution and supply
• Distribution networks
• Power system protection