Relay protection method and device

The embodiment of the invention discloses a relay protection method and device. The relay protection method comprises the steps that the maximum load current of a line, the voltage and current of a preset protection road section in the line before a fault occurs, and the fault voltage and fault current of the preset protection road section after the fault occurs are acquired; according to the voltage and current of the preset protection road section before the fault, the fault voltage and the fault current, a tripping action current is determined, and an overcurrent protection current is determined according to the maximum load current; and the state of the relay in the circuit is controlled according to the fault current, the tripping action current and the overcurrent protection current. According to the relay protection method and device provided by the embodiment of the invention, the reliability of relay protection can be improved. 本发明实施例公开了一种继电保护方法和装置，该继电保护方法包括：获取线路的最大负荷电流、线路中预设保护路段发生故障前的电压和电流，以及预设保护路段发