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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.
新的判据可以基本满足超高压长输电线路的要求，是一种比较理想的比相判据。
It can be proved by theoretical analysis that the new criterion can basically meet the need of protections of HV and UHV transmission line.
LTWP还必须建造一条266英里长的输电线路和几个变电站，用以连通风力发电厂和国家电网。
LTWP also has to construct a 266-mile transmission line and several substations to connect the windfarm to the national grid.
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