| 摘要 |
A doubly-insulated hydrogen seal casing (60) is provided about a generator shaft (16) and coupled to an end shield (14) by a single bolt circle (74) with bolts extending through an annular conductive ring (62) and two layers (64,66) of electrical insulating material. The first layer (64) is interposed between the annular conductive ring (62) and the seal casing (60) and the second layer (66) is interposed between the conductive ring (62) and the end shield (14). By this construction, the insulation resistance of the insulating layers can be measured with the seal casing installed and by using only a single bolt circle, the space occupied by the seal casing is substantially reduced. <IMAGE> |
