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中文摘要：
在分析同杆双回线主要的排列方式和不平衡电流现象的基础上,研究了超高压同杆双回输电线路在区外相间故障时由于零序环流超过门槛值造成的零序功率方向元件误动事故。对同杆双回线零序环流不平衡度进行了分析,并利用EMTDC对同杆双回线发生区外相间故障时的零序环流不平衡度进行了仿真计算。针对零序环流造成同杆双回线方向纵联保护误动的情况,提出了同杆双回线序分量方向纵联保护的改进措施。
英文摘要：
Based on analysis of several main arrangements of same-pole double-circuit transmission line（SDTL） and unbalanced current phenomenon,a fault caused by zero-sequence power directional component mal-operation resulted from over threshold value of zero-sequence circulating current,when an external inter-phase fault happened in EHV SDTL,is analyzed.Then the analysis method of zero-sequence circulating current unbalance of SDTL is given.And a simulation of zero-sequence circulating current unbalance for an external inter-phase fault on SDTL is completed with EMTDC.As for mal-operation of SDTL directional pilot protection caused by zero-sequence circulating current,the improvement measures of SDTL＇s directional pilot protection based on the sequence components is put forward.
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