750 kV酒杯型复合横担杆塔电场仿真计算及电晕试验  

Electric Field Computation and Corona Test for Composite Cross-Arms in 750kV Cup Type Tower

作　　者：杨林[1] 谭浩文[1] 王加龙[2] 彭宗仁[2] YANG Lin;TAN Haowen;WANG Jialong;PENG Zongren(Northwest Electric Power Design Institute Co.,Ltd., Xi＇an 710075, Shannxi Province, China;State Key Laboratory of Electrical Insulation and Power Equipment （Xi＇an Jiaotong University）, Xi＇an 710049, Shannxi Province, China)

机构地区：[1]西北电力设计院有限公司,陕西省西安市710075 [2]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《电网技术》2018年第6期2009-2015,共7页Power System Technology

摘　　要：750 kV酒杯型复合横担杆塔的横担部分同时承受电气和机械荷载,其运行电压等级高,绝缘结构复杂,电位、电场分布不均匀,影响线路长期稳定运行。以750 kV酒杯型复合横担杆塔为研究对象,应用三维有限元分析方法,建立了750 kV酒杯型复合横担杆塔的三维仿真模型,计算了各相复合横担在不同方案下的电位、电场分布,设计了各相复合横担的均压屏蔽装置,优化了均压屏蔽装置的结构参数。电场计算结果表明优化后的均压屏蔽装置能使复合横担各关键位置电场强度满足控制要求,真型塔头电晕试验结果表明复合横担绝缘子及金具在1.2倍试验电压下未发现可见电晕放电,可应用于实际工程。Composite cross-arm of 750 kV cup type tower bears both electric and mechanical loads. Owing to its high operation voltage and very complex insulation structure, potential and electric field distributions of composite cross-arm are extremely uneven. It may affect long-term stable operation of transmission line. Using three dimension finite element method（FEM）, this paper presented research on voltage equalizing characteristics of composite cross-arms in 750 kV cup type tower. Computation model was established. The potential and electric field distributions of middle phase and side phase under several design schemes were computed. The program for grading and shielding devices was designed and then optimized. The electric field computation results showed that the electric field strengths on key positions were within permitted range. Corona tests showed that no visible corona discharge was found from insulators or fittings when the applied voltage was 1.2 times of test voltage. The design of the grading and shielding devices can be applied in actual projects.

关 键 词：酒杯塔 复合横担 均压 有限元 电晕试验 

分 类 号：TM75[电气工程—电力系统及自动化]