最新发电机异常运行ppt课件.ppt

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1、发电机异常运行发电机异常运行发电机的过负荷现象 oa系统报文“发电机过负荷告警”；ob定子、转子电流超过额定值，转子电压超过正常值；oc发电机频率、电压降低；od发电机有功、无功负荷超过正常值。 The generator overload situation:a.the system message forgenerator overlad alarm,bThe current of stator and rotor exceed the rated value,the rotor valtage exceed the normal value,cthe decline of frequen

2、cy and valtage,d generator active and unactive load exceed narmal value.发电机CT断线 oa开路相电流降低，有功、无功指示降低；b发电机电压，转子电流、电压指示正常。 oThe disconnection for generator CT:oa.open circuit phase current decline,active and reactive indication decline;ob.the voltage and rotor current are in normal condition.发电机升不起电压 o

3、发电机达到额定转速后，按操作程序投入励磁装置电源，增磁、减磁发电机励磁屏上交直流表计均无指示或变化。 oa停止升压，励磁装置退出运行；b检查电压表，励磁转子回路有无断线；c检查灭磁开关是否合好；d检查发电机PT、励磁PT保险是否完好，刀闸是否合好；e检查励磁变压器一次保险是否完好；f检查发电机电刷是否接触良好；No voltage in generator:When the generator at a rated speed,according to the operation procedure,switch on excitation power, no index or change of ac meter, Treatment:a.stop voltage increasing,stop the excitation operation; b.check voltage meter,if the excitation rotor circuit is disconnected; c.; d.check the generator PT,excitation PT