Most of the lightning accidents in power system are derived from transmission line.In order to solve the problem of lightning flashover caused by lightning stroke

the lightning protection method of high speed airflow is put forward.It transfers the arc to the gap to protect the insulator

at the same time

the high speed airflow that produced by the signal of thunder trigger bullets fleetly sever the arc and disperse the gallery

which prevents the line tripping out effectively.This paper establishes high speed airflow velocity field model and Mary arc transient model

the coupling effect of airflow and arc is simulated and analyzed by FLUENT finite element analysis software

it is concluded that the high speed airflow produced by the explosion causes the arc to be extinguished in 1.7 ms.The arc extinguishing test is carried out in the high voltage laboratory.Monitoring of the arc quenching process by high speed cameras and oscilloscopes

the test shows that the high speed airflow can extinguish the arc in 2 ms.The simulation results and the test results are basically consistent

both of which are less than the time of transmission line protection relay

which can be concluded that the high speed airflow arc-extinguishing method is effective and feasible.