The article is devoted to analysis of the results of industrial tests of current distribution dynamics in the brush-contact apparatus of the turbo-generator TVV-800 (800 MW) using a microprocessor based monitoring system. New methods of assessing the quality of current-collecting devices functioning is developed, allowing to assess current transfer in dynamics and to determine their quality characteristics. New trends of current distribution dynamics between the parallel brushes that allow on the basis of statistical and variance analysis to develop practical recommendations for maintenance of these devices are revealed. The results of the research in the form of scientific articles are published for the first time.

Sliding contacts are widely used in electrical machines despite the trend towards non-contact methods of the electrical current transfer. In some cases, using of brush-contact devices is indispensable due to low cost and continuity of operations. One of methods to improve reliability of sliding contact is simulation modeling. This approach can significantly reduce the amount of expensive practical experiments in the study of different contact pairs characteristics. The paper introduces and describes a few new algorithms for simulation model of sliding contact which allow to improve precision and take into account more physical processes occurring in contact transient layer.

Such processes in electric machines having sliding contacts as sparking and overheating can be the reason of the deep electroerosive wear. Searching effective ways to reduce sparking has an obvious practical significance since it extends the service life of the sliding contact in particular and service life of the electro-mechanic units in whole. This article contains information about physical processes in the electrical sliding contact. The method of spark suppression related to LC filters introduced to the electromagnetic brush circuits is considered, the device for spark reducing is suggested. The calculations of the impact of the device for spark reducing on sparking and thermal processes in the contact pairs are described.

No abstract

<p class="R-AbstractKeywords"><span lang="EN-US">The method to determine parametric instability regions of the electromagnetic circuit of the secluded brush contact of brush-contact device with using the oscillation equation  Mathieu II order for a dissipative system with one degree of freedom is developed. Recommendations on the selection of the parameters of the external damping device to eliminate the instability of electromagnetic waves in unstable working conditions brush-contact device are  given.</span></p>