蒙特卡洛法计算750kV输电线路绕击跳闸率的研究  

Calculation of shielding failure trip-out rate for 750 kV transmission line based on Monte Carlo Method

作　　者：宗天元[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院电气系,陕西杨凌712100

出　　处：《宁夏电力》2013年第1期18-24,共7页Ningxia Electric Power

摘　　要：针对规程法计算输电线路绕击跳闸率误差较大的问题,采用了蒙特卡罗法计算绕击跳闸率,对雷电流幅值、先导对地面和导线的击距、地面倾角、绝缘子串50%放电电压等参数进行了分析,基于电气几何模型(Electric-Geometry Model,EGM),选用实际运行的兰州东-平凉-乾县750kV超高压输电线路计算绕击跳闸率,并分析了导线高度对绕击跳闸率的影响。结果表明:蒙特卡罗法计算的绕击跳闸率可信度较高,并且导线高度对绕击跳闸率影响较大。For accurate evaluation on lightning withstands performance of transmission line, the sto- chastic process of lightning stroke is studied by using the Monte Carlo method. It is found that the am- plitude of lightning current, striking distance factor, string insulator 50% discharge voltage, the incli- nation angle of ground are crucial in the Monte Carlo method. An electric-geometry model （EGM） is used to judge whether the transmission line is shielded or not. The shielding failure trip-out rate of 750 kV transmission lines is calculated, and analyzed the impact of wire height. The result shows that the shielding failure trip-out rate calculated by the Monte Carlo method is convinced and wire height makes a great impact on shielding failure trip-out rate.

关 键 词：蒙特卡罗法 超高压 750 KV EGM 绕击跳闸率 

分 类 号：TM751[电气工程—电力系统及自动化]