特高压直流、交流与接地极线路同塔防雷研究OA

In order to reduce the occupation of land resources,it is necessary to erect the common tower of ultra-high-voltage direct current,high-voltage alternating current and grounding electrode lines,and the lightning protection performance of the line under this mode is very important for the safe and stable operation of the system.Based on the electricmagnetic transient program and the improved electrogeometric model,the simulation calculation of the lightning resistance performance of±800 kV,2×220 kV and the common tower of the grounding electrode line is carried out,and the lightning trip rate of the common tower and the single erection under the same conditions is compared and analyzed,and the risk of bipolar locking of the common tower of the grounding electrode line is studied.The research results show that the lightning flashover rate of±800 kV line and the bipolar lockout rate caused by the common tower of the grounding electrode line is low,and the 2×220 kV line of the common tower is the weak point of lightning protection.Compared with the single erection,the lightning trip rate of the±800 kV line is significantly reduced,and the lightning trip rate of the 2×220 kV line will be significantly increased.The lightning trip rate of the 2×220 kV line can be effectively reduced by strengthening the insulation supplemented by reducing the protection angle and other optimization measures.In the process of lightning protection optimization,full attention should be paid to the insulation coordination between different lines.