750kV同塔双回输电线路瓷绝缘子串电位分布数值分析  

Numerical Analysis of Potential Distribution of Porcelain Insulator Strings for 750 kV Double-circuit Transmission Lines on the Same Tower

作　　者：刘渝根[1] 田金虎[1] 刘孝为[2] 程溪[1] 肖磊石[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]陕西电力科学研究院,西安710054

出　　处：《高电压技术》2010年第7期1644-1650,共7页High Voltage Engineering

摘　　要：确定输电线路绝缘子串电位分布对绝缘子的设计及运行、维护很重要。根据线路实际情况,考虑铁塔、分裂导线、均压环、避雷线等因素的影响,建立了750kV同塔双回输电线路绝缘子串电位分布三维电场有限元仿真计算模型,采用场域分割的方法将开域场转化为闭域场,并在场域边界上引入渐进边界条件。分析讨论了分裂导线、铁塔、避雷线、均压环、绝缘子型号、悬挂方式、导线排列方式等因素对绝缘子串电位分布的影响。结果表明,分裂导线、铁塔对绝缘子串电位分布影响较大,分析计算时不可忽略;均压环能够显著改善绝缘子串的电位、电场分布;避雷线、绝缘子型号、绝缘子串悬挂方式、绝缘子材质等因素对不同位置的绝缘子串电位分布均有影响。According to the actual situation of the insulators,three-dimensional electric field computation models for 750 kV double-circuit transmission lines on the same tower,considering the effects of tower,bundle conductors,grading ring,shielding line and so on,were established based on the finite element method（FEM）. The open boundary field was transformed into finite field by the domain decomposition method and the asymptotic boundary conditions. The impacts of some factors,such as tower,bundled conductors,grading ring,shield line,the type of insulators,insulator suspension mode,conductor arrangement and so on,on the potential distribution of insulator strings were analyzed. Thus,the curve of potential distribution of the insulator strings was determined. The results show that the bundle conductors and tower affect the potential distribution of insulator strings greatly and cannot be ignored. The grading rings can significantly improve the potential,electric field distribution of insulator strings. The others,such as shielding line,the material of insulator,the type of insulators,insulator suspension mode,conductor arrangement,etc,have influence on the potential distribution of insulator strings.

关 键 词：750KV同塔双回输电线路 绝缘子串 电位分布 有限元法 电场强度 三维模型 

分 类 号：TM216[一般工业技术—材料科学与工程]