A method for reducing the temperature rise of half-speed high-current collector ring device

Abstract

The invention provides a method for reducing the temperature rise of a half-speed large-current collecting ring device. The method for reducing the temperature rise of the half-speed large-current collecting ring device aims to improve the current-carrying capacity of the half-speed collecting ring device. The diameter of the collecting ring device is increased, the number of carbon brushes is increased, the arrangement of the carbon brushes on a collecting ring is optimized, meanwhile, the diameter of a centrifugal fan is increased, a ventilation system of the collecting ring device is optimized, and therefore the surface temperature of a sliding ring is lowered to be within a permitted range of not larger than 80K. The method effectively reduces the temperature rise of the half-speed large-current collecting ring device, and improves the current-carrying capacity of the collecting ring to the 10000A level.

Description

technical field [0001] The invention relates to a method for reducing the temperature rise of a half-speed high-current collector ring device, which belongs to the technical field of steam turbine generators. Background technique [0002] In a large turbogenerator, there are usually two ways to connect the excitation current to the generator, one is the coaxial brushless exciter method, and the other is the collector ring device method. The collector ring method uses the coupling between the static carbon brush on the brush holder and the rotating collector ring in the device to connect the excitation current to the generator. The collector ring device is favored by users for its simple structure, stable shafting and fast response. As the excitation current required by the generator increases, the current-carrying capacity of the collector ring device is required to be increased, and the temperature rise and cooling in the collector ring device have become a technical bottl...

AI Technical Summary

Problems solved by technology

The speed of the four-pole generator is half that of the two-pole generator. Since the speed is halved, the cooling effect of the centrifugal fan is greatly reduced. At the same time, as the excitation current increases, the electrical loss of the collector ring also increases. As a result, the temperature rise of the slip ring surface of the collector ring device will increase, and the working conditions of the carbon brush and slip ring surface will become more bottlenecks

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