Baotou 220kV Double Circuit Transmission Line On The Same Tower Lightning Striking Simultaneity Tripout Fault Analysis And Lighting Protection Reform

Lightning striking transmission line is one of the main causes of power system trip. The lightning striking can cause the single line trip as well as the trip of the two circuits simultaneously, for double circuit transmission lines on the same tower. Simultaneity Tripout Fault for the system is far greater than the damage to the line single trip, especially the220 k V-line Simultaneity Tripout Fault, the trip rate is higher. Once the trip to the system impact is strong, it may even cause power outages and other negative accident.Recently, it is reported that Baoqing 220 k V Double Circuit Transmission Line on the Same Tower Lightning Striking Simultaneity Tripout Fault occurred 2 times.This article uses ATP-EMTP software modeling and Simulation of accident reappearance, and analysis of several influence factors of lightning with jump. A research has shown: The frequency phase of 220 k V line is the main reason to affect the sequence of ABC phase of double circuit transmission lines.The wire arrangement has little influence on the anti-lightning level of tower, but has certain influence on the specific flashover. The size of the grounding resistance has great influence on the anti-lightning level of the grounding resistance, and the higher the anti-lightning level of the grounding resistance is Line lightning arresters with different installation methods are different.In order to improve the anti-lightning capacity of Baoqing Transmission, this paper uses the differentiated anti-lightning method. Considering the packet Baoqing Transmission topography,parameters of line structure and insulation configuration feature on route 95 base tower of the lightning back flashover risk assessment, and the nature of the anti-lightning reform. Based on the evaluation results: The Baoqing Transmission consists of 23 base tower lightning risk at C with a relatively high risk of lightning and the suggestion is to reduce the grounding resistance.There are 9 base tower lightning risk grades in the class D. Suffer lightning risk greatly, it is recommended in reducing the resistance transformation simultaneously, according to the transformation of the grounding resistance valuer, the grounding resistance is approaching 20Ωbelow the tower, in a group with the same phase line two arrester. For tower grounding resistance,it can not be approaching below 20Ω, in double circuit lines on the lower installation 4 pieces of arrester, to reduce the probability of Baoqing Transmission lightning in order to ensure the safe and stable operation.