390H型发电机转子退磁方法探讨

Discussion on the method of 390H generator rotor demagnetization

针对390H型发电机转子轴颈、滑环、风扇盘、中心环等部位被磁化问题,分析了发电机转子磁化的原因,在退磁工期短、现场交流调压器容量不足、汽轮机侧护环未拔出的条件下,综合采用直流退磁法和交流退磁法对被磁化的部件分别进行退磁处理,退磁效果良好,彻底消除了发电机轴瓦烧损、轴颈电灼伤等安全隐患。

To solve the magnetization problem of journal,sliding ring,fan disk of 390H type rotor journal,sliding ring,fan disk central ring and other parts,the causes were analysed.At the scene of the demagnetization short time limit,the insufficient capacity of ac voltage regulator,steam turbine side guard ring did not pull out the conditions,comprehensive the direct current demagnetization method and ac demagnetization method is adopted to be magnetized parts separately demagnetization,demagnetization effect is good,completely eliminated the generator bearing damage,journal electric burns safe hidden trouble.