DEVELOPMENT OF AUTOMATED DEVICES FOR STARTING OF ASYNCHRONOUS MOTORS WITH ENHANCED SWITCHING WEAR RESISTANCE

Array

Authors

Keywords:

automated low-voltage complete devices, asynchronous motors, hybrid contactor.

Abstract

Automated low-voltage complete devices, which are usually designed on the basis of classical electromagnetic contactors, are intended for the starting of asynchronous motors. However, at starting frequencies above hundreds of starting per hour, their application is ineffective because of low switching wear resistance of electromagnetic contactors in their construction. Also, their use in industrial enterprises with aggressive environment is limited due to the problems with contacts of electromagnetic contactors.These problems are successfully solved by the use of hybrid contactors instead of electromagnetic ones as a part of the low-voltage complete devices. Therefore, the target of the study is to develop a highly reliable automated starting devices for asynchronous motors which based on a hybrid contactors. In accordance the analysis of existing one and development of new schemas of automated low-voltage complete devices on the basis of hybrid contactors for starting of asynchronous motors has been done in the work. Also the analysis of existing schemas and development of new schemas of hybrid contactors have been carried out.Two variants of schemes of these automated low-voltage complete devices on the basis of hybrid contactors are presented in the work and their work is analyzed.It is shown that one of the device type should be used in hard operating conditions and, above all, with high frequency of engine starting (more than 30 starts per hour). In this case, the switching wear resistance of this device will be 25 – 30 times higher than switching wear resistance in the case of the use of traditional contactors. The low-voltage complete devices of the first type are recommended for use in normal ambient conditions due to the presence of leakage currents in load with open contacts.The using of an additional separating electromagnetic contactor in the second variant of the device allows to exclude the presence of these currents, and therefore, allows to use such low voltage complete devices in an explosive environment. The principle of operation of this device provides the switching of electric circuit without current, which provides practically unlimited switching wear resistance of the hybrid contactor within the device, and provides a galvanic separation of network and load.

The hybrid contactor proposed for low-voltage complete devices in comparison with the ones previously used has increased reliability of operations at reduced dimensions and cost. There are due to the fact that the control circuit for the switching of controlled power semiconductor devices was simplified due to reduction of the number of its elements; in the open condition of the contactor, the control circuit is uncurrent; about 50% lower copper consumption in the current transformer due to a decrease in the number of secondary windings.

Author Biographies

A. Soskov, O.M. Beketov National University of Urban Economy in Kharkiv

Doctor of Technical Sciences, Professor

N. Sabalaeva, O.M. Beketov National University of Urban Economy in Kharkiv

Candidate of Technical Sciences, Associate Professor

References

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Published

2019-07-02

How to Cite

Soskov, A., & Sabalaeva, N. (2019). DEVELOPMENT OF AUTOMATED DEVICES FOR STARTING OF ASYNCHRONOUS MOTORS WITH ENHANCED SWITCHING WEAR RESISTANCE: Array. Municipal Economy of Cities, 3(149), 9–15. Retrieved from https://khg.kname.edu.ua/index.php/khg/article/view/5410