RESEARCH OF WAYS TO START THREE-PHASE ASYNCHRONOUS MOTORS IN THE SYSTEM OF OWN NEEDS IN THE ETAP SOFTWARE PACKAGE

Abstract

In the systems of own needs ofpower plants and substations, there is an improvement in the technical and economic indicators of technological units by means of increasing the reliability of operation of electrical and mechanical equipment. In systems of own needs ofpower plants and substations, AC electric drives, especially three-phase asynchronous motor with a short-circuited rotor, are the most common, both in terms of quantity and total installed capacity. The wide application of asynchronous motors is explained by their advantages in comparison with other drives, such as simplicity during repair, the number of small elements in the design, high reliability, the probability ofworking directly from the AC network (direct start) and ease of maintenance. However, the simplicity of the design makes it difficult to start the asynchronous motor itself [1]. Direct start of an asynchronous motor always accompanies a large starting current, a failure of the voltage on the buses of power plants and substations, increases the start-up time, failure of the asynchronous motor and driven mechanisms, etc. The deterioration of the quality of electrical energy during direct start-up leads to an increase in the probability of failure, as well as a decrease in the reliability, efficiency and resource of additional equipment powered by buses for their own needs ofpower plants and substations [2].

Keywords

• etap