题目

英语翻译
相序保护可以保证电动机的正反转符合分接开关的升、降档要求,防止电动机误动作．
电动操作包括从分接开关本体上和自动控制器上进行．同时观察逐级控制,各种保护是否正常．透过分接开关观察窗查看操作位置,在任何情况下都不可超越终端位置．
经上述安装调试后,确定分接开关的各项功能都正常,方可投入运行．

提问时间：2020-12-04

答案

Phase-sequence protection can ensure that the positive and reverse rotations of the motor comply with the upshift and downshift requirements of the shunting switch,so as to avoid mis-operation of the motor.
Electromotion operation occurs on both the shunting switch and the automatic control.Besides,it is necessary to observe whether the step-by-step control and various protections are normal.Check the operation locations via the observation port of the shunting switch.And never go beyond the terminal location.
After the said installation and commissioning,make sure all the functions of the shunting switch are normal before formal operation commences.