走廊紧张地区110 kV输电复合材料火箭塔电气性能研究

Research on electrical performance of 110 kV composite rocket tower in tight corridor area

为了缓解土地紧张地区土地供应紧张与输电线路征地间的矛盾,本文开发了一种全新结构型式的复合材料绝缘杆塔,其外形像一枚火箭,导线从绝缘的复合材料火箭塔内部穿过,最大程度地压缩线路走廊,并对110 kV复合材料火箭塔的电气性能进行系统研究。结果表明:110 kV复合材料火箭塔的干雷电冲击电压为979 kV,湿操作冲击电压为576 kV,1 min湿工频耐受闪络电压平均值为282 kV,在盐密度为0.20 mg/cm^(2)、灰密度为1.00 mg/cm^(2)的污秽度下,工频污秽闪络电压为106.2 kV;相比传统110 kV悬式复合绝缘子铁塔,110 kV复合材料火箭塔的雷电冲击电压值提升了78%,湿操作冲击电压值提升了34%,1 min湿工频耐受闪络电压值提升了22.6%,污秽闪络电压值相当,且大幅压缩了线路走廊,其最小线路走廊宽度为1.8 m,远低于110 kV铁塔5.5~7.5 m的走廊宽度。

In order to relieve the conflict between tight land supply and land acquisition for transmission lines in tight land supply area, we developed a new structural type of composite material insulated tower, which looked like a rocket, and the wires passed through the insulated composite material rocket tower to compress the line corridor to the greatest extent.Besides, the electrical performance of the 110 kV composite rocket tower was systematically studied. The results indicate that the dry lightning impulse voltage of the 110 kV composite rocket tower is 979 kV, the impulse voltage under wet condition is 576 kV, the average value of 1 min wet power frequency flashover voltage is 282 kV, and the power frequency pollution flashover voltage at 0.20 mg/cm^(2) of salt density and 1.00 mg/cm^(2) of gray density is 106.2 kV. Compared with the traditional 110 kV suspension composite insulator iron tower, the lightning impulse voltage value of 110 kV composite rocket tower increases by 78%, the impulse voltage value under wet condition increases by 34%, the 1 min withstand wet power frequency flashover voltage increases by 22.6%, and the pollution flashover voltage value is equivalent. In addition,the line corridor is greatly compressed, and the minimum line corridor width is 1.8 m, which is much smaller than the corridor width value(5.5-7.5 m) of 110 kV iron tower.