适用于高土壤电阻率地区的220/110kV输电线路塔型研究

雷电故障是220/110 kV高压输电线路的主要故障型式,特别在高土壤电阻率地区体现为雷电反击故障。结合国家电网公司提出的输电线路典型设计思想,分析了高压输电线路的5种典型塔型结构,认为酒杯塔和猫头塔是承受线路反击故障的主体。选择220 kV同高度的典型酒杯塔和猫头塔建立仿真模型,采用ATP/EMTP的标准反击计算方法进行耐雷水平和反击跳闸率的计算。结果表明,在取冲击接地电阻为25Ω条件下,酒杯塔的反击耐雷性能稍好于同等参数的猫头塔。

Research of Tower Type Applicable to 220/110 kV Power Transmission Line at High Soil Resistivity Areas

The lighting failure is the main fault type for 220/110 kV high-voltage power transmission line,reflected as a lightning back-flashover failure especially in high soil resistivity.According to the typical design theory proposed by State Grid Corporation of China,the five typical tower types is analyzed,and then the cup-type tower and cat-head tower are the main towers for the back-flashover failure.Selected the same height tower of the two types tower,the calculation model used ATP/EMTP program is constructed,therefore,the lighting withstand level and the back-flashover trip rate are calculated.The results show that,taking the grounding resistance of 25 Ω condition,the lightning back-flashover performance of cup-type tower is slightly better than the cat-head type tower with the same parameters.