六序分量补偿的同杆双回线接地电抗继电器

Ground-fault Relay Compensated by Six-sequence Components for Double-circuit Transmission Lines on the Same Tower

由于平行双回线间存在复杂的电磁耦合,传统的距离保护动作特性受线间零序互感影响,可能造成拒动或误动。为此,采用六序分量法对同杆双回线进行解耦,推导出保护安装处的电压与电流关系。在此基础上,引入六序分量零序补偿系数,提出以环流零序电流I觶F0作为极化量的新型接地电抗继电器。仿真结果表明,新方案具有较高灵敏度与可靠性。

Due to the intricate electromagnetic coupling in the parallel double-circuit, the charateristics of traditional ground distance protection will be influenced by inter-line zero-sequence mutual inductance, which potentially leads to the protection＇s under-reach or over-reach. In this paper, the relation between the voltage and current of the site of pro- tection is presented based on the six-sequence component method. Furthermore, a new action criterion of earthing-fauh reactance-relay that treats loop flow zero-sequence current IF0 as polarization is also proposed. The high sensitivity and reliability are demonstrated through the result of simulation.