A New Shielding Efficiency of Stator Core End Packets of a Powerful Turbogenerator

D. I. Khvalin

Institute for Safety Problems of Nuclear Power Plants,
NAS of Ukraine, 12, Lysogirska st., Kyiv, 03028, Ukraine

DOI: doi.org/10.31717/2311-8253.21.2.3

Abstract

On the basis of complex research the electromagnetic and heat processes by means of mathematical and physical simulation, the efficiency for a new constructive solution of stator core end zone of powerful turbogenerator is proved. A design that allows maximum reducing temperature of the stator end packet is proposed. In order to increase reliability of experimental data obtained with the help of scale physical model, as well as testing of constructed mathematical model, using the latest one “adjusted” to physical model, the numerous experiments for studying effectiveness of a tooth-slot configuration shields were carried out. The small difference of magnetic flux density values obtained by means of mathematical simulation from the experimental ones allows drawing a conclusion about the reliability of result. It is shown that use of physical simulation permits investigate the appropriateness of electromagnetic field distribution without exact quantitative indices of parameters and can be applied to research the quality comparison under certain changes of model. When constructing a mathematical model, an approach was used with the help of a consecutive logic transition from a simple model of machine central part to more difficult one of end zone, using the previous results in next allows obtaining the temperature distribution in difficult areas. The heat calculation for rated load condition of turbogenerator type TGV-500 with the help of mathematical model as well as comparison of these results with experimental data for a real generator analogous type and power are made. The differences of calculated and experimental values not exceed 7%. All data obtained by means of both simulation and natural experiment are corresponded to the same turbogenerator that in total makes reliability results of mathematical simulation not obtained in a real object by various reasons of objective and subjective nature.

Keywords: powerful turbogenerator, end zone, shielding, scale physical model, mathematical model, electromagnetic field, temperature.

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