1. Function of automatic zero clearing when power up.
上电自动清零功能。
2. Have functions of automatic zero clearing when power.
上电自动清零功能。
3. Have functions of automatic zero follow and automatic zero clearing when power up.
自动零位跟踪，上电自动清零功能。
4. Method for solving the brief maloperation problem of zero sequence directional relay after the clearing of a external fault;
解决外部接地故障切除瞬间，零序方向元件短时误动作问题的方法；
5. The Study on The Method of Clearing Zero by Feedback with MAX + plus ⅱ Software
用MAX+plusⅡ软件对反馈清零法的研究