The Investigation of the Lightning Overvoltage of Secondary Cable of Substation

Lightning activities are easy to cause secondary equipment fault, affecting the safe and reliable operation of the substation. In this paper, the lightning current, tower, insulator string, overhead line, secondary cable, transformer, capacitor voltage transformer (CVT), earthing network and arrester are modeled by EMTP software. The simulation model of the whole substation is built, and the lightning overvoltage of the secondary equipment in the substation is simulated and analyzed. On the basis of common secondary side overvoltage protective measures, an overvoltage protective measure composed of zinc oxide arrester series transient suppression diode and LC low-pass filter is proposed, and the effectiveness of this protective measure is verified by simulation.