However, when the test temperature is greater than 10°C, the flexural strength rapidly decreases, which is related to the resin composition of SDn49. As the turbine generator generates heat during operation, the hot mechanical strength is the issue we are most concerned about. The main insulation mechanical strength after impregnation with SDl49 will mutate above 10°C, however, most of the motors operate at temperatures below 10°C. Therefore, it can be popularized on the main insulation bar of conventional motors, and the application on air-cooled motors needs further improvement. From the above, it can be seen that although the sample rod is not as good as the plastic in the impact resistance, it is excellent in the bending performance, especially the high temperature bending performance. For the motor insulation, the force applied during the manufacturing process and during the operation is basically the lateral bending stress, so the bending stress is more practical. Therefore, the VPI insulation structure system using SDl49 and less tape 43855AW can replace the main adhesive insulation system in terms of mechanical properties. This shows that the VPI rod made of SDn49 impregnated resin can meet the standards of qualified products in the mechanical stator coil rating standard after electrical aging for 621 hours, which confirms the sDn49 impregnation line. The rod has good electrical aging resistance. With the continuation of the thermal stability of the main insulation over time, the original functionalities of the insulating material are gradually lost under the influence of the external stress, which is the aging phenomenon of the material. In order to verify the stability of the main insulation performance of the SDI 149 and 4385AW insulation systems, we will make a good wire rod for tapping (air-blow inspection) and room temperature to measure and measure the size of the wire rod. The bars were then placed in an oven at 170°C and 5°C for 48 hours and the above items were retested. Bar specifications and test data Five aluminum rods with a size of 13x51x150 were used. The main insulated wires of sDl49 and PDS4385AW with a single-sided insulation thickness of 3.5 were made according to the same process parameters. Main insulation was performed in the transformer oil. Breakdown test. The test conclusion is based on the inspection requirements of the JB/82-1 turbo-generator, and the rated voltage is as good as possible. From the overall level of the main insulation breakdown strength, it can be concluded that the electrical insulation strength data of the main insulation made of SDn49 and the imported plastic mica tape have small dispersion, and the performance exceeds the standard of the superior product wire rod.
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Breakdown test of main insulation
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