所以线路换位的目的是要使每相导线感应阻抗和每相的电容相等，以减少三相线路参数的不平衡。
It analyzed the unbalance of both single-circuit line and double-circuit lines in same tower, made a summary of their transposition methods.
为降低长输电线路的电流不平衡度，需要进行导线换位。
Conductor transposition is necessary to reduce unbalanced current in long transmission lines.
为了减少电力系统正常运行时电流和电压的不对称性，原则上高压架空线路应采用换位措施。
In order to decrease the asymmetry of current and voltage of the power system, the high voltage transmission lines should be transposed in principle.
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