Abstract
The operation of electric locomotive traction motors in conditions of constantly increasing temperature and humidity naturally leads to a decrease in the resistance of the body insulation of the coils of the main and auxiliary poles, which then leads to insulation breakdown and engine failure. In the general statistics on TED breakdowns, the percentage of failure due to low insulation resistance is up to 30%.
 Manufacturers of electrical insulation are constantly working to increase its reliability, using modern systems of polymer materials for this purpose. This article provides a brief description of the insulation systems of traction electric motors of heat resistance class H (180 °C) based on polyethyrketone and polyimide films. The main normative documents on the basis of which the assessment of insulation characteristics was carried out are indicated. Insulating tapes based on fiberglass and mica, mass-produced by ZEIM Elinar LLC, were used as objects of research. The methods are given, the equipment and the main results of resource tests of various insulation systems are indicated. According to the test results, it is shown that the system based on a polyester ketone film is in no way inferior in terms of heat resistance to a system based on a polyimide film.
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