水轮发电机轴绝缘监测方法及效果分析

Monitor method and effect anlaysis of shaft isolation of turbine generator

当绝缘薄弱时,低值的轴电压也可能对发电机部件造成一定的危害。结合现场测量数据对轴电压的性质作了分析,列举出对发电机造成损坏的各种情形。在其检测手段上,分别对轴绝缘检测法和轴电流测量法的原理进行了分析,对三峡电站的应用效果作了评估,比较了两种方法的特点优劣,提出了应用注意事项和优化手段。

Small shaft voltage can still injure generator parts under weak isolation situation. This paper studies characteristic of shaft voltage and lists several cases that can damage generator. The operation principles are analyzed referring to the shaft isolation detection method and the shaft-current measurement method. Application effects are evaluated in Three Gorges Power Station. A comparison is made between two supervision methods, and matters needing attention and optimization measures are given.