Development of Stator Winding Insulation for New-Type 4-Pole Turbine Generators

摘要

We recently developed and supplied 4-pole turbine generators with a newly adopted the salient solid poles design. This development is for the increase of power and for higher efficiency. This 4-pole turbine generator is for 75MVA capacity model which is our largest production turbine generator model. In order to obtain a further compact design and higher efficiency, we developed a stator winding insulation system. By adopting thin materials and field grading, we reduced the insulation thickness of stator coils by more than 10% compared with our conventional model. Further, we developed a new insulation system that ensures a useful life of 20 years or more according to the IEEE 1553/IEC 60034 evaluation. In addition, the stress caused by the change in the structure of the stator end winding was evaluated, and we confirmed sufficient reliability.