Hydro-generator carbon brush and collecting ring current-carrying frictional wear simulation test device and method

Abstract

The invention provides a hydro-generator carbon brush and collecting ring current-carrying frictional wear simulation test device and a hydro-generator carbon brush and collecting ring current-carrying frictional wear simulation test method. The hydro-generator carbon brush and collecting ring current-carrying frictional wear simulation test device comprises a bracket system and a test system, wherein the bracket system is used for supporting and installing the whole device, a driving system used for providing power is fixedly installed on the bracket system, and a collecting ring is installedat an output end of a main shaft of the driving system; three carbon brushes of the same model are arranged at the lower end of the collecting ring, and include an anode carbon brush, a cathode carbon brush and an auxiliary carbon brush; the plurality of carbon brushes are respectively in contact fit with brush holders arranged on a plurality of corresponding levers, and the plurality of levers are respectively supported on a vertical bracket of the bracket system; the collecting ring and the plurality of carbon brushes are connected with a loading system; an adjusting system is mounted on the loading system and the levers; and the test system is used for collecting experimental data. Therefore, the current-carrying frictional wear testing machine can measure the friction coefficient between the carbon brushes and the collecting ring in real time.

Description

technical field [0001] The invention relates to the field of friction and wear test devices, in particular to a current-carrying friction and wear simulation test device for carbon brushes and collector rings of hydroelectric generators. Background technique [0002] The carbon brushes and collector rings of hydroelectric generators are channels for transmitting the excitation current of the generator, and are one of the important parts of the generator. The carbon brush is fixed on the brush holder by a constant pressure spring and is in direct contact with the collector ring. During the actual operation of the hydroelectric generator set, the carbon brush and the collector ring contact each other to cause mutual friction and wear. During the friction and wear process Overheating of the brushes, sparking, and tempering are prone to occur in the process, resulting in burning accidents of the collector rings and brushes of the generator rotor, resulting in the shutdown of the...

AI Technical Summary

Problems solved by technology

The carbon brush is fixed on the brush holder by a constant pressure spring and is in direct contact with the collector ring. During the actual operation of the hydro-generator set, the carbon brush and the collector ring contact each other and cause mutual friction and wear. In the process of friction and wear Overheating of the brushes, sparking, tempering, etc. are easy to occur in the process, resulting in burning accidents of the collector rings and brushes of the generator rotor, resulting in the shutdown of the unit for maintenance, which is time-consuming, laborious and expensive

[0003] At present, according to the actual field investigation, the failure of the excitation system of various large and small hydro-generator sets usually manifests as the burning accident of the collector ring and the carbon brush, which is related to the excessive wear and tear between the friction pair of the carbon brush and the collector ring and It is related to uneven wear; the replacement cycle of carbon brushes is usually 2-3 months, and every time the carbon brushes are replaced, the machine must be shut down. When the wear is serious, the surface roughness and roundness of the collector ring will not meet the requirements, so that Need to return to the factory for re-grinding

This is not only time-consuming and laborious, but also causes the unit to stop running for a period of time.

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