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Analysis of Existing Methods for Detecting the State and Defects of the Brush-Contact Device of a Turbine Generator

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Power Technology and Engineering Aims and scope

Currently, there are several types of electric machines in which brush-contact devices (BCD), consisting of electric brushes and slip rings (collectors), are used to transfer electric current from the stationary part to the rotary one. These include synchronous and asynchronous motors with a phase rotor, DC and AC collector machines, as well as turbine generator. As the experience of operating these machines shows, the largest share of their failures occurs due to the BCD-related breakdowns, making up 25% of total annual breakdowns. Officially, according to the data of Russian Scientific Research Institute on Electrical Engineering, out of the 250 200 – 800 MW turbine generators operating in the Russian Federation, 20% of their failure and up to 20% of their idle time for repair involve BCD defects. The turbine generator BCD is a structural unit that requires constant supervision and adjustment during the turbine generator operation. Inadequate monitoring can lead to the rapid development of “flashover”—a severe accident, followed by a long downtime for the equipment repair. Therefore, there is a need to improve the reliability of the BCD unit operation. The following objectives have been accomplished in this paper: physical processes during the turbine generator BCD operation are considered; the main types of BCD failures are analysed; current global methods for detecting excessive vibration and defects in the turbine generator BCDs are examined; methods of predicting the development of defects by means of statistical mathematical simulation of the objects have been proposed.

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Authors and Affiliations

  1. NRU “Moscow Power Engineering Institute”, Moscow, Russia

    A. V. Okhlopkov & V. D. Bitney

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  1. A. V. Okhlopkov
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  2. V. D. Bitney
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Correspondence to V. D. Bitney.

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Translated from Élektricheskie Stantsii, No. 5, May 2022, pp. 32 – 42. DOI: https://doi.org/10.34831/EP.2022.1090.5.006

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Okhlopkov, A.V., Bitney, V.D. Analysis of Existing Methods for Detecting the State and Defects of the Brush-Contact Device of a Turbine Generator. Power Technol Eng 56, 587–596 (2022). https://doi.org/10.1007/s10749-023-01558-0

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  • DOI: https://doi.org/10.1007/s10749-023-01558-0

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