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兖州矿业(集团)公司济宁三号煤矿矸石热电厂WX21Z-073LLT型无刷励磁发电机组采用RCS-985型微机保护装置,要求有2只电刷分别从转子绕组正极和负极引接。该厂励磁机端仅1只测量电刷由转子绕组负极引出。他们对发电机转子接地保护原理进行改造,实现1点接地保护报警、2点接地保护动作与跳闸,保证发电机的安全运行。采用微机保护装置生产厂家的外加电源转子接地保护原理测量转子回路的对地电阻。当该测量值小于转子1点接地的定值时,转子1点接地保护动作发出信号,无须确定接地位置;此时可手动投入2点接地保护,发现转子有第二点接地时,定子二
Yanzhou Mining (Group) Company Jining III coal gangue thermal power plant WX21Z-073LLT brushless excitation generator using RCS-985-based computer protection device requires two brushes were taken from the rotor winding positive and negative lead. Exciter side of the plant only one measurement of the rotor from the negative rotor winding leads. They modified the principle of the generator rotor ground protection, to achieve 1:00 ground protection alarm, 2:00 ground protection action and tripping, to ensure the safe operation of the generator. Using computer protection device manufacturers plus external power supply rotor ground protection principle to measure the resistance of the rotor circuit to ground. When the measured value is less than the value of the grounding point of the rotor 1 point, the rotor 1 point grounding protection action signal, no need to determine the grounding position; this time can be manually put 2:00 ground protection and found that the rotor has a second grounding, the stator