MONITORING THE QUALITY OF ELECTRICAL INSULATION OF THE WINDINGS OF DRIVE ELECTRICAL MOTORS USED IN TECHNOLOGICAL PROCESSES
The necessity of monitoring the technical condition of drive engines used in technological processes of different industries is substantiated. It is established that for the implementation of the monitoring system, it is necessary to select equipment and the corresponding nodes, which are first to be monitored, and then to develop, systems for monitoring its technical condition on their basis. A review of well-known works on the development of methods for assessing, control and diagnosing the technical condition of an electrical motor has been carried out. It is stated that, in spite of the results achieved in identifying the occurrend of defects and faults in electrical machines, the task of monitoring the drive motors of technological mechanisms is of particular interest. At that, the fact that any type of malfunction and its development leads to disruption of the technological process, causing enormous economic damage. Taking into account the fact that the service life of an engine often depends on the condition of the winding insulation, this article also focuses on the assessment and detection of damage of the winding insulation in the early stages of operation. To monitor the insulation state of the drive motor used in the process, an absorption method has been applied. By experiment, insulation resistances and absorption coefficients have been determined between the phases, as well as between each phase and the body. Experimental studies were carried out on a three-phase motor with a short-circuited rotor of the AOL 011-2 type. An algorithm for decision making on any measures based on the results of the obtained tests is presented. In particular, as a result of monitoring, an appropriate decision can be made on the need for drying, cleaning or immediate stop of the motor for the purpose of repair.