500 KV三回同塔输电线路设计探讨

在经济发达的走廊狭窄地区, 可考虑建设500 kV 三回同塔线路, 采用双横担、每回三角布置的改进型酒杯塔。经计算、评估, 其导线表面最大电场强度、可听噪声和无线电干扰等, 均不超过现行规定要求。可采用三地线、负保护角方案, 经评估计算, 其耐雷性能较高。其自然输送功率较常规500 kV 单回线路提高7.3%～9.1%。预测的准确性尚有待于试验检验。

Discussion on 500 kV Triple-Circuit Transmission Line Design

In developed areas with narrow corridors,500 kV triple circuit lines,which use modified cup-shaped tower with double crossarms and triangular circuit configuration,can be considered.Through calculation,the maximum conductor surface electrical field strength,audible noise and radio interference,etc.,are all within current limitations.Triple ground wires and negative shielding angle scheme can be adopted because of high lightning resistance.Its transmission power is 7.3%~9.1% higher than that of 500 kV regular single circuit lines.However,the predictions still need to be validated through experiments.