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The paper analyzes the stability of driving mechanisms of auxiliary induction motors of thermal power plant. The calculation takes into account operating (pressure) characteristics of pumps and draft equipment, as well as the characteristics of the pipeline networks needed to determine the mechanisms of torque-speed characteristics. The resulting method of calculation was integrated into the software "KATRAN", where the calculation of transients is based on the method of successive intervals taking into account the adjusted analysis depending on the time of the machine operating speed. Modeling emergency operation makes it possible to determine the success of the self-start of auxiliary generators and motors to meet the needs of the plant. On the basis of the simulated emergency operation we found sensory elements in the scheme assessing the stability of auxiliary generators and motors. The developed method can be used to select the parameters of operation of relay protection and technological systems of auxiliary needs of thermal power for more reliable operation of the main and auxiliary process equipment.


Station auxiliaries, feed pumps, operating characteristics, characteristics of the pipe network, torque-speed characteristics, dynamic stability, self-starting motor, sensory.

Aleksey V. Malafeev

Ph.D. (Eng.), Associate Professor, Department of Industrial Electric Power Supply, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia.

Maksim A. Tremasov

Engineer, Electricial Engineering Department, "Magnitogorsk Gipromez" JSC, Magnitogorsk, Russia.

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