中文摘要：

被广泛应用于电力系统的距离保护多采用阻抗距离继电器为核心元件。阻抗距离继电器受系统振荡影响，需配合振荡闭锁元件构成保护，使得距离保护变得复杂。以多相补偿距离继电器为核心的距离保护能够防止振荡对距离保护的影响而无需时间闭锁元件。因此，对多相补偿距离继电器动作特性进行深入分析是十分必要的。通过分析多相补偿距离继电器的动作判据，给出了多相补偿距离继电器包含的3个元件在系统振荡且发生单相接地故障情况下的动作特性，包括反映故障相元件的拒动范围和反映非故障相元件的误动范围，并指出了其在构成距离保护II段、III段时的不足。PSCAD仿真结果验证了所得结论。

英文摘要：

An impedance relay is the core element of a distance protection, which is widely applied in power systems. Impedance relay’s operation can be affected by power swings. Therefore, a power swing blocking element is required to work with, which makes the distance protection scheme more complex. Using the multiphase compensated distance relay as the base, the resultant distance protection can be made insensitive to the power swings and no additional time blocking element is needed. So, it is valuable to analyze the operation characteristics of multiphase compensated distance relays. By analyzing the relay’s equation, this paper reported on the performance of the three elements in multiphase compensated distance relays in the case of a single phase to ground fault during power swings. This paper defined the missing operation’s area for a faulty phase element and the maloperation’s area for a health phase element. The paper also pointed out the disadvantages of the relay working as the protection of II or III section. PSCAD simulation results verified the conclusions.