洞坪电厂发电机转子绝缘电阻降低故障的分析与处理  

Analysis and Treatment of Insulation Resistance Reduction Fault of Generator Rotor in Dongping Hydropower Plant

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作  者:周佳杰 曹开国 单奇 张明彪 ZHOU Jiajie;CAO Kaiguo;SHAN Qi;ZHANG Mingbiao(Loushui Hydropower Co.,Ltd.,Hubei Energy Group,Enshi 445801,China)

机构地区:[1]湖北能源集团溇水水电有限公司,湖北恩施445801

出  处:《水电与新能源》2023年第7期76-78,共3页Hydropower and New Energy

摘  要:针对洞坪水电厂2号水轮发电机转子绝缘降低缺陷,从多方面分析原因确认,由于刷握变形、磨损量增大、绝缘子破损等引起碳粉堆积,严重污染运行环境所致。在更换新的绝缘子后,将绝缘子与汇流板的安装间隙利用绝缘漆填充封闭,对支撑螺栓及螺母上涂刷绝缘漆,增加汇流板与支柱螺栓间的绝缘距离;在更换碳刷时,对部分安装固定螺丝过长,导致底板受力严重变形的刷握进行更换,并处理刷握边缘毛刺降低摩擦力以减少碳粉的产生,处理后已安全运行6个月,情况良好。An insulation resistance reduction fault is observed in the rotor of 2#hydro-turbine generator in Dongping Hydropower Plant.Analysis shows that the fault is due to the serious pollution of the operation environment by the carbon powder accumulation induced by the deformation and wear of the brush holder and the damage of insulators.After the replacement of the insulators,the installation clearance between the insulators and the busbar plate is filled and sealed with insulation paint and the support bolts and nuts are coated with insulation paint,so that the insulation distance between the busbar plate and the support bolts is increased.When replacing the carbon brushes,some brush holders that are fixed with excessively long installation screws resulting in severe deformation of the base plate are replaced.Also,the burrs on the brush holder edges are polished to reduce friction and the generation of carbon powder.After the treatment,the unit has been operated safely for 6 months in a good condition.

关 键 词:绝缘电阻 碳粉堆积 碳刷架 水轮发电机 

分 类 号:TK731[交通运输工程—轮机工程] TK737[动力工程及工程热物理—流体机械及工程]

 

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