Increasing the operational reliability of the system for water cooling of electric motors of 300 MW generating unit feed pumps
Electric motors used to drive the feedwater pumps in USSR power plants have a system for direct water cooling (SDWC) of the rotor and a system for indirect water cooling (SIWC) of the stator. The tendency toward damage of the water cooling system of 24 electric motors installed at four power plants in 3 power systems was analyzed with the following results. The SDWC of a rotor of an AV-8000/6000UZ electric motor in the group under consideration has an average specific tendency toward damage that is 1.5 times greater than the similar tendency for the SIWC of the stator. It follows from consideration of the histograms that the operational time of the electric motors before currents of the largest number of failures in the SDWC of the rotor is 4 to 5 x 10/sup 3/ h, whereas for the SIWC of the stator it is 5 to 7 x 10/sup 3/ h, which corresponds to an operating time for the electric motors of 6 to 8 and 8 to 12 years. During this period it is advisable during repairs to pay special attention to the condition of the most reliable components and the unitized elements of the SIWC of the stator: threaded connections, cooling segments and their hydraulic connections, collectors. In conjunction with the markedly increase seen tendency toward damage of water coolers and the achievement of a maximum condition after operating life equal to 6 x 10/sup 3/ h, it is advisable to replace them with reserves.
- OSTI ID:
- 6456569
- Journal Information:
- Sov. Power Eng. (Engl. Transl.); (United States), Vol. 10:11; Other Information: Translated from Elektr. Stn.; No. 11, 30-34(Nov 1981)
- Country of Publication:
- United States
- Language:
- English
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