... Improve power factor and curve of voltage 改善系统电压爿波形，提高电网功率因数 To help to arc extinguishing 有利于接触器的灭弧 To pretect system 保护设备正常运行 ...
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微机保护系统是电力系统的重要组成部分，但由于其耐压水平低，雷电波侵入电源系统时易导致设备的损坏，严重影响了电力系统的正常运行。
But the invasion of lightning surge may lead its failure due to its low voltage withstand level which may affect the normal service power system.
继电保护装置是一种反应电力系统故障和不正常运行状念，并动作于断路器跳闸和发出信号的设备。
Relay protection is one of device to respond the fault and abnormal circulate situation of electric power system, to make the breaker action and to send out the signal.
如果不能在运行过程中对三相设备进行缺相保护，则会使三相设备在断相情况下异常工作，轻则设备运行不正常，重则烧毁三相设备。
If no open phase protection is available during the operation course of three-phase equipment, it shall operate abnormally under open phase condition or shall be burnt if the case is serious.
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