directional impedance relay

例句：

1. 1.The directional impedance relay is used to detect the direction of an electrical current.
   定向阻抗继电器用于检测电流的方向。
2. 2.The directional impedance relay is crucial for maintaining the stability of power systems.
   定向阻抗继电器对于保持电力系统的稳定性至关重要。
3. 3.The directional impedance relay can be used to protect equipment from overloads and faults.
   定向阻抗继电器可用于保护设备免受过载和故障的影响。