FACTS devices are presently used to improve the power transfer capability of a transmission line and voltage stability of a power system network. Shunt injected current (I_sh) by the Static Var Compensators (SVC) causes underreach or overreach of distance relay when not considered during relay calibration of protection system. This paper presents an adaptive relay setting procedure in the presence of a SVC connected at the midpoint of a transmission line. The remote terminal unit RTU is connected to the SVC terminal via a current transformer (CT) measures the injected shunt current when the SVC is the switch in or out of the network and transferred the measured value to the local station via fiber optic. The PSCAD/ EMTDC software is used to model an adaptive relay that implements the conventional and adaptive relay system settings. The proposed scheme presents a hybrid distance protection system whose setting is based on the prevailing SVC switching conditions; the relay system was implemented using mho characteristics relay. The results obtained show that the proposed scheme has a high accurate setting.

FACTS设备目前用于改善传输线的功率传输能力和电力系统网络的电压稳定性。分流注入电流（I _sh如果在保护系统的继电器标定过程中不考虑静态无功补偿器（SVC）的故障），则会导致距离继电器超程或超程 本文提出了一种在传输线的中点连接了SVC的情况下的自适应中继设置过程。远程终端单元RTU通过电流互感器（CT）连接到SVC端子，当SVC是网络的接入或出网开关，并且通过光纤将测量值传输到本地站时，该电流互感器（CT）会测量注入的并联电流。PSCAD / EMTDC软件用于对自适应继电器建模，该继电器实现了常规和自适应继电器系统的设置。提出的方案提出了一种混合距离保护系统，其设置基于当前的SVC切换条件。该继电器系统是利用mho特性继电器实现的。结果表明，该方案具有较高的精度。