为了防止水轮发电机组的轴电流,在推力轴瓦及导轴瓦的瓦座间加有槽绝缘,绝缘管及绝缘垫如右图所示。但在安装中,有时这些绝缘体被水或脏物污染,绝缘电阻极低,达不到规程规定值0.5兆欧,不能满足使用要求。一般情况下,可以拆开瓦座,清洗、烘干或更换绝缘。但对于被洪水淹没的机组, In order to prevent the hydro-generator set of shaft current, in the thrust bearing pad and guide bearing pad plus slot insulation, insulation tube and insulation pad as shown. However, during installation, sometimes these insulators are contaminated with water or dirt, the insulation resistance is very low, which can not meet the requirement of 0.5 MΩ, and can not meet the requirements of use. Under normal circumstances, you can open the tile seat, cleaning, drying or replacement of insulation. However, for flooded units,