对电机的缺相,过流,过压,欠压保护- it is very good, i wish every can learn this

水利水电行业，溢洪道、坝体泄洪孔口宽顶堰过流能力计算-Hydalic spillway discharge computation

过流1段保护函数，判断采集到的电流值，如果3次中有2次大于保护整定值，即发出脱扣指令-Over-current protection function, paragraph 1, determine the current value of the collected, and if there are 2 3 times greater than the protection setting value, that is, release orders issued

液压阀U形阀口位移—面积变化曲线，将阀口开度与过流面积之间的关系生成曲线图，可作为控制信号输入amesim,进行系统仿真(The u-shaped valve outlet displacement of hydraulic valve, the curve of area change, generates the curve diagram of the relationship between the opening of the valve and the over-current ar