Through the comprehensive evaluation of the main insulation performance of the SDn49 system, the following conclusions are drawn:
(l) The vacuum bar impregnated resin sDl49 and the bar with less inlet tape have excellent dielectric properties, and the high temperature dielectric loss and increment are small compared with the PDS53841PU resin. The data of normal dielectric loss is completely lower than that of the award-winning superior products, and has significantly improved compared with the current domestic use of adhesive-molded wire rods.
(2) The mechanical properties of the insulation are good, especially the bending strength at the operating temperature of the motor is increased and the pressure of the mold is increased, which provides a guarantee for the reliable operation of the large motor. However, it needs further improvement to apply to the main insulating structure of an air-cooled motor, especially to increase the thermal bending strength.
(3) Impact resistance of sDn49 resin impregnated resin and imported less tape PDS43855AW is lower than that of multi-rubber bar main insulation, which is mainly related to the amount of glass cloth in the insulation system. The increase of the mica content in the tape will inevitably reduce the content of the glass cloth, but the impact strength test cannot fully reflect the environment in which the main insulation is in operation of the motor. The main mechanical stress suffered by the main insulation when the motor is running is bending stress.
(4) Domestic vacuum pressure impregnating resin sDl49, after the electrical aging test of the wire bar confirms that the electrical aging life of the main insulation of the sDll49 and the less imported tape fully meets the technical requirements of the medium-sized motor molded coil of the mechanical part, but The application to large stator coils of turbo-generators still requires a further combination of processes to improve the electrical insulation properties of the main insulation.
(5) From the residual dielectric loss of the low-grade VPI main insulation obtained from SDn49 resin after electrical aging, SDll49 impregnating resin has good resistance to electrical aging, and the performance of the main insulation after aging can still meet the ministerial standard. Qualified product requirements.
(6) The heat aging test of the low-gelled VPI main insulation made from sDl49 resin can be concluded that SDn49 has good heat resistance, and the dielectric insulation performance of the main insulation after heat aging can fully meet the requirements of the Ministry of Machinery Industry. Product requirements. The application of vacuum pressure impregnation (VPI) on the motor at home and abroad The vacuum pressure impregnation technology is widely used in large and medium-sized generator manufacturing industries in foreign countries. In the 1940s, Siemens Westinghouse developed a solvent-free vinegar for vacuum VPI, replacing the original asphalt insulation. With the continuous improvement of the properties of the impregnated resin and the low mica tape, the thickness of the main insulation is gradually reduced. At present, the vacuum pressure impregnation technology of Siemens Westinghouse has been applied to the insulation structure of a 125MW MW turbine generator.
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