Analysis shows that the voltage operating dead zone is small and have more sensitivity than traditional power directional relay.
分析表明其电压动作死区很小，比传统的功率方向元件具有更高的动作灵敏性。
The motion of ship is nonlinear. The operating machine has nonlinearity such as dead zone and relay.
船舶运动呈非线性，操作机构有明显的死区、继电等非线性；
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