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Extra resources for 1095-1989 (R IEEE Guide for Installation of Vertical Generators and Generator. Motors for Hydroelectric Applications

Sample text

A complete visual inspection should be made t o eliminate this possibility. Where single insulation is used, all connections between the rotor and the frame a t the lower end of the machine must be removed to test the bearing insulation, or each joint must be isolated and tested individually. 7 Installation of Lubrication System. Every section of pipe forming a part of the lubrication system should be freed of scale, reamed a t both ends, and blown out with compressed air or steam before being connected.

The elevation of a self-oiled bearing must be such t h a t the oil groove, if any, is completely covered by the opposite member. The elevation must also be such that, when the rotor is raised to its maximum upward position by the jacks, the bottom of the journal will be below the center of the guide bearing. After the bearing has been assembled, the remaining parts of the oil reservoir are added. Clearances between these parts and the shaft must be adequate to prevent rubbing. 9 Check of Insulation Against Shaft Currents.

If the rotation check by method 1 is used, it shall be performed during the erection of the generator t o avoid subsequent disassembly of the machine. 11 Shaft-Plumb and Straightness Check. This is a plumb-wire check of the straightness and plumbness of the combined generator and turbine shafts. The use of four plumb lines spaced 90 degrees apart around the shaft i s recommended. T h e readings should be taken from the same points on each shaft t h a t were used during the factory runout check.

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1095-1989 (R IEEE Guide for Installation of Vertical Generators and Generator. Motors for Hydroelectric Applications


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