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讨论根据测量电流、电压的相位差Δｔ与电源各相全电流Ｉ１判断电动机运行状态的原理．提出用微机模拟异步电动机的工作特性曲线，实现异步电动机的多种故障状态多重保护的方法．
Discuss the principle of judging the running state of the motor based on the phase difference Δt between the measured current and the voltage and the full current I1 of each phase of the power supply. A method to simulate the operating characteristic curves of asynchronous motors by computer is proposed to realize the multiple protection of multiple fault states of asynchronous motors.