Abstract
A mathematical model has been developed for calculating the distribution of azimuthal velocities and the shape of the free surface of oil in the compartments of an oil bath of a hydro-generator. The mathematical model of oil flow is verified by comparing the calculated radial-vertical distributions of normalized azimuthal velocities obtained on its basis with the free surface of the oil with the empirical data of third-party authors. The verification showed a good fit between the calculated and experimental distributions, which allows recommending the developed mathematical model for use in engineering practice. Calculations were carried out for the modes of the oil movement in the thrust bearing and the guide bearing of the hydro-generator of the Bajo de Mina HPP. Recommendations are made for the elimination of emergency modes associated with oil overflow through the fencing of the thrust bearing oil bath, which separate oil bath from the shaft of hydro-generator.
Highlights
The first commissioning tests of the Bajo de Mina HPP pioneer hydraulic unit were conducted on July 8, 2011
The reason for the shutdown is the discharge of oil up to 350 liters through the shell of the oil bath of the thrust bearing and the guide bearing to the rotor, the poles and the generator winding
The thrust bearing of the Bajo de Mina HPP unit is shown in Fig. 1, where the outlines of the stationary elements are highlighted by a solid black line, and the sleeve rotating together with the shaft at an angular speed has a gray outline
Summary
The first commissioning tests of the Bajo de Mina HPP pioneer hydraulic unit were conducted on July 8, 2011. The oil level dropped 68 mm from the normal 915 mm above the bottom of the oil bath. This situation led to the need to carry out this work. The thrust bearing of the Bajo de Mina HPP unit is shown, where the outlines of the stationary elements are highlighted by a solid black line, and the sleeve rotating together with the shaft at an angular speed has a gray outline. Because of axial symmetry the drawing is made up to half the section
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