DEVICE TO PROTECT A GROUP OF ASYNCHRONOUS ELECTRIC MOTORS

  • С. Ф. Курашкін Таврійський державний агротехнологічний університет імені Дмитра Моторного
  • І. О. Попова Таврійський державний агротехнологічний університет імені Дмитра Моторного

Abstract

Operation of asynchronous electric motors in the composition of the electromechanical system provides for maintaining their reliability at a level that will ensure their long-term operation of the guaranteed service life not less stated by the manufacturer. However, during operation, asynchronous electric motors are influenced by various operational factors or their combinations, not taken into account by the manufacturer, which may lead to their premature failure. The most vulnerable structural element of an electric motor is its winding in general and its insulation in particular. If we take the insulation service life, guaranteed by the manufacturer as the base, then it can be worked out much faster. A number of factors affect the rate of insulation deterioration, but somehow their main part leads to an increase in winding temperature and deterioration of its insulating properties. To improve the operational reliability of electric motors, the developers are designing new protection devices, since over time the element base of electronic components is updated, which makes it possible to apply new methods for solving problems that could not be done before. For example, the appearance of programmable microprocessors made it possible to embody the results of modeling physical processes that occur in an electric motor, in the form of mathematical models by which the microprocessor calculates them and, in accordance with the result, decides whether or not an electric drive can work. The work put forward the requirements that must be met by the protection device of a group of electric motors and its structural and schematic diagrams are developed. The basis of the device is a microcontroller, which calculates the permissible operation time of each electric motor included in the protection group in case of overload, when the winding temperature exceeds the critical level. The disconnection of electric motors group does not occur immediately, but after a time delay calculated by the microcontroller, provided that the isolation resource is allowed to flow. The device uses temperature transducers based on the lambda diode analogue.

References

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Published
2019-03-02
How to Cite
Курашкін, С., & Попова, І. (2019). DEVICE TO PROTECT A GROUP OF ASYNCHRONOUS ELECTRIC MOTORS. Proceedings of Tavria State Agrotechnological University, 19(2), 229-236. https://doi.org/10.31388/10.31388/2078-0877
Section
Електроенергетика, електротехніка та електромеханіка

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