The mechanism study of jet stream interrupter gap lightning protection device

To address the problem of lightning struck on overhead transmission lines, a kind of jet stream interrupter gap lightning protection device (JSIGLPD) installed in the overhead transmission lines was developed. When lightning struck on the transmission line and cause AC flashover of insulator strings, the device is able to quickly cut off the frequency freewheeling, and effectively protect the insulator strings against ablation of frequency electric arc. The JSIGLPD can achieve the function of limiting the external over-voltage on insulators and avoiding frequent tripping of circuit breaker. This paper studied the movement characteristics of electric arc under the conditions of jet stream based on the chain arc model and shock wave theory, and discussed the arc quenching process.