Fixing method of 600MW steam-turbine generator stator coil end

Abstract

The invention relates to a fixing method of a 600MW steam-turbine generator stator coil end. According to the method, technological innovation is performed on fixing of the stator coil end, a traditional method of rope binding is broken through, the fixing structure of a large-size overall glass fiber reinforced plastics conical ring, adjustable binding rings and a nose radial bracing ring is adopted, and meanwhile a rigid-flexible fixing structure which is formed at the whole stator coil end and firmly fixed in the radial direction and the tangential direction and is retractable in the axial direction through connection between a non-magnetic spring plate and a stator core end. When a generator operates or breaks down suddenly, a coil bar expands or contracts in the axial direction due to temperature changes, the stator coil end can expand and contract in the axial direction overall, so that thermal stress in coil insulation is effectively slowed down, and the generator is adapted to peak load operation conditions. In the stator coil end fixing structure, all fasteners making contact with a coil are made of non-metallic materials, so that the phenomena of local overheating and point discharge caused by the adoption of metallic materials are avoided.

Description

Technical field: [0001] The invention belongs to the technical field of turbogenerator manufacturing, and in particular relates to a method for fixing the end of a stator winding of a 600MW turbogenerator. Background technique: [0002] The electric field distribution at the end of the stator winding of the turbogenerator is relatively complicated, and the structure of the end of the winding is similar to a cantilever beam, which is not easy to fix compared with the inner part of the winding slot. It is easy to be damaged under the action of rising and huge electric power, and further development will cause the winding to be short-circuited to the ground and burn the motor. Facts have proved that a large number of accidents of generators are caused by sudden temperature changes and vibrations of the end windings. Short-circuit accident, the invention is developed on the basis of the traditional generator stator winding end fixing technology. Invention content: [0003] I...

AI Technical Summary

Problems solved by technology

[0002] The electric field distribution at the end of the stator winding of the turbogenerator is relatively complicated, and the structure of the end of the winding is similar to a cantilever beam, which is not easy to fix compared with the inner part of the winding slot. It is easy to be damaged under the action of rising and huge electric power, and further development will cause the winding to short circuit to the ground and burn the motor

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