同塔双回输电线路导地线布置对架空地线感应电流的影响

输电线路架空地线逐基接地时存在感应电流和电能损耗,目前对架空地线感应电流数值大小和影响机制的研究较少,对架空地线损耗问题重视不足。以某双回线路为例进行了架空地线感应电流现场实测和ATP-EMTP数值计算,计算了不同线路长度、档距、导地线型号、导地线空间布置等输电线路结构参数对架空地线感应电流和电能损耗的影响。计算结果表明:线路起始段(长度小于9 km)时架空地线感应电流随着线路长度增大而增大;不同档距和导线型号通过导线弧垂变化影响架空地线感应电流和电能损耗;地线感应电流和电能损耗随着导地线空间距离增大而减小,随导地线高度变化明显,导线相间距和地线间距影响小。

Influence of the Wires Grounded Layout on the Induced Current of Overhead Ground Wire in Transmission Line With Double Circuits at the Same Tower

As the calculated result for shielding failure trip-out rate of the transmission lines is not accurate enough due to the classic EGM based on the single transmission line and single ground line, this paper proposes a new calculation method based on a improved electro-geometric model (EGM). The new method takes the mutual shielding effects among the grounding line, multi-line and ground into account as well as the influence of the amplitude and angle of lightning current on the rate.