高压直流接地极线路阻抗监视系统断线故障时动作性能评估

Performance Evaluation of HVDC Electrode Line Impedance Supervision System under Line Break Fault

摘要:

高压直流接地极线路阻抗监视系统用于监测接地极线路运行状态。阻抗监视系统的动作性能直接影响着对 接地极线路运行状态的实时感知。通过理论分析，推导了接地极线路在双回线断线和单回线断线故障情况下，阻抗 监视系统测得的阻抗结果。通过不同故障位置的阻抗结果遍历，分析了不同断线故障情况下阻抗监视系统的动作性 能。分析结果显示，在单回线断线故障时，在特定的接地极线路长度下，阻抗监视系统容易发生拒动。

Abstract:

The operation state of HVDC electrode line is monitored by electrode line impedance supervision ( ELIS) ． The performance of ELIS will affect the operation state identification of electrode line． With theoretical analysis，the measured impedance by ELIS is obtained under double － line break faults and single － line break faults． The performance of ELIS is analyzed based on the impedance measured with different break faults． The results show that for single － line break faults under some specific electrode line lengths，the ELIS will be unable to monitor the fault reliably．