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1、Four short words sum up what has lifted most successful individuals above the crowd: a little bit more.-author-date保护代码的中文解释应用：ANSI 代码ENGLISH NAME代 码 含 义14Zero speed and underspeed dev.21Distance Protction,phase相间距离21NDistance protection,ground接地距离24Overfluxing过励磁25Synchronism check检同期27Undervoltage
2、低电压27/59/81U/f prtection电压/频率保护32Directional power功率方向32FForward power正向功率保护32RReverse power逆功率保护37Undercurrent or underpower欠电流监测40Field failure低励磁保护46Load unbalance,negative phase sequence overcurrent负荷不平衡保护负序电流保护47Phase sequence voltage负序过电压48Incomplete sequence,locked rotor,failure to accelerate
3、启动时间监视49Thermal overload热过负荷保护49RRotor thermal protection转子过热保护49SStator thermal protection定子过热保护50Instantaneous overcurrent瞬时过流保护50NInstantaneous gorund fault overcurrent瞬时零序过流保护51GGround overcurrent relay零序过流保护51GNStator ground-fault overcurrent定子接地过流保护51Overcurrent with time delay时限过流保护51NGround-
4、fault overcurrent with time delay时限零序过流保护59Overvoltage过电压保护59NResidual voltage ground-fault protection64RRotor ground fault转子接地保护67Directional overcurrent方向过流保护67NDirectional ground-fault overcurrent方向接地过流保护67GStator ground-fault,directional overcurrent定子接地保护、方向过流保护68/78Out-of-step protection失步保护79A
5、utoreclose自动重合闸81Frequency relay频率保护85Carrier interface远方跳闸86Lockout relay,start inhibit跳闸锁定，禁止87GDifferential protection,generator发电机差动保护87TDifferential protection,transf.变压器差动保护87BDifferential protection,bus-bar母差保护87MDifferential protection,motor电动机差动保护87LDifferential protection,line线路差动保护87NRestricted earth-fault protection限制性接地保护92Voltage and power directional rel.电压及功率方向保护50BFBreaker failure断路器失灵保护-