The zero-sequence parameter of transmission lines especially of transmission lines with mutual inductances is of great important in the relay protection setting calculation of power system.
输电线路的零序参数尤其是多回互感线路的零序参数是电力系统继电保护整定计算需要的重要参数，所以其准确测量具有重要意义。
Whether the switching sequence of reactive power equipments is correct or not directly determines the stable operation of HVDC transmission systems.
无功管理是高压直流输电工程设计的重要组成部分，无功设备投切顺序正确与否直接关系到直流输电工程能否安全稳定运行。
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