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

Example text

They should be located in air spaces under the machine or a t the back of the stator core and be distributed around the periphery of the machine t o allow for an even distribution of heat. If the rotor is not in place, the ends of the machine may be closed with end bells o r with large tarpaulins t o reduce the heat loss. A slight amount of ventilation must be provided t o exh a u s t the moisture-laden air. Precautions should be taken t o prevent fire when this type of heat is applied. (6) Further details of drying out windings are given in the IEEE SM 43-1974 [71.

This insulation should be checked with a 500 V insulation resistance meter and, if the resistance is less than 200 000 Q, the insulation should be inspected and the necessary corrections made. In the case of a thrust bearing, the insulation should be checked with the weight of the rotor on the bearing. If double insulation is provided (two layers of insulation with a metallic compound between the layers), its resistance can be checked with the machine completely assembled. However, each parallel path must be checked individually.

I t is recommended t h a t a representative of the generator manufacturer be present when the foregoing tests are made. 2 Electrical Tests. The larger generators (above 5000 kVA) usually receive only winding resistance measurements and dielectric tests a t the factory, and any additional testing 5Skate is the lateral random movement of a shaft superimposed on the periodic runout. This movement may be up to the full clearance of the bearing and is generally not considered significant in a n analysis of shaft motion.

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


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