In order to solve the general lightning problems of 35 kV transmission lines, a new arc-extinguishing and lightning protection gap (NALPG) is proposed in this article. So as to verify the feasibility of the device, the principle of arc extinction of the device is discussed, and the mechanism of arc development and extinction is studied. Meanwhile, the electromagnetic transient calculation software is applied to build a 35 kV transmission line model of lightning strike to analyze the transient process of the device after arc quenching. Simulation results show that NALPG has the ability to reduce lightning overvoltage and harmonic components. Then, experimental circuit is constructed to conduct power frequency arc cut off test. The test results show that the entire arc extinction time is only 4.0 ms and the arc does not reignite for a period of time. Until now, the actual lightning protection effect of NALPG shows excellent results in line operation.