To address the problem of lightning stroke on 35 kV overhead transmission lines

a jet stream interrupter gap lightning protection device（JSGLPD） for 35 kV overhead transmission lines was developed.When a lightning stroke on the transmission line causes AC flashover on insulator strings

the device is able to quickly cut off the power frequency freewheeling arc to effectively protect the insulator strings against ablation of the power frequency arc.The JSGLPD can achieve the function of limiting the external over-voltage on insulators and avoiding frequent tripping of circuit breaker.Moreover

the movement characteristics of electric arc in jet stream were investigated on the basis of an arc model

in which the arc is assumed to be a chain of small rigid cylindrical current elements

and the arc quenching process was discussed.In addition

a high speed camera system and an oscillograph were used to observe the changes in the current of arc

and the result shows that the arc can be cut off instantly by the high-speed air jet stream.