To reach thermal stability class H, according to the standard GOST 2582-81, new insulating materials are required. Comparative tests of insulating systems in tractional electric motors that withstand temperatures up to 220 deg C at working voltages up to 4000 V are described. In these tests, the capacitance, the resistance, and the tangent of the dielectric loss angle are measured for various types of wires, steeping fluids, and insulating materials. The mockups are thermally aged for 480 hours at 260 deg C. During tests for electrical strength, the time to breakdown is determined. The results show that the required characteristics of the insulation are obtained when using winding wire with corona-resistant polyimide film and unsteeped polyimide-mica tape, after steeping the windings in silicone.
Heat-resistant insulating systems of tractional electric motors for electric trains
Temperaturbeständige Isoliersysteme für Fahrmotoren elektrischer Bahnen
Russian Electrical Engineering ; 76 , 3 ; 10-13
2005
4 Seiten, 5 Bilder, 4 Tabellen, 5 Quellen
Article (Journal)
English
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