Existing fault analysis method for double-circuit power transmission lines on the same tower is not applicable any more due to influence of mutual inductance among coupling lines. Therefore,this paper studies fault analysis on partial cou-pling double-circuit power transmission lines. According to structures and characteristics of partial coupling double-circuit transmission lines,sector equations for partial coupling double-circuit power transmission lines are established by using phase component method and port network theory. A kind of fault calculation method for partial coupling double-circuit power transmission lines is realized by combining fault boundary condition equation. Finally,electromagnetic transient simulation software ATP-EMTP is used for constructing a model for emulation proof and the result indicates that the proposed method has small errors in calculation and is not affected by transition resistance and fault types.%受耦合部分线路间互感的影响,现有的针对完全同塔的故障分析方法不再适用.为此,针对局部耦合双回输电线路的故障分析展开研究.根据局部耦合同塔双回输电线路的结构和特点,利用相分量法和端口网络理论建立局部耦合双回输电线路各区段方程,结合故障边界条件方程,实现了一种针对局部耦合双回输电线路的故障计算方法.最后,利用电磁暂态仿真软件ATP-EMTP构建局部耦合同塔双回输电线路模型并进行仿真验证,结果表明所提方法计算误差小,且不受过渡电阻和故障类型的影响.
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