PROJECT TITLE :

Finite-Element Calculation of 3-D Transient Electromagnetic Field in End Region and Eddy-Current Loss Decrease in Stator End Clamping Plate of Large Hydrogenerator

ABSTRACT:

The stator clamping plate is an important element of hydrogenerators used to fasten the stator end core. Because of the complicated leakage electromagnetic field in the end region, eddy-current loss within the stator clamping plate is sometimes terribly massive, which will result in partial overheat. Analysis of eddy-current losses in stator clamping plates and cheap structure design are the premise of guaranteeing the safe and stable operation of a giant hydrogenerator. A 278-MVA hydrogenerator is taken as an example in this paper, and therefore the calculation model of 3-D transient electromagnetic field of end region is established and validated by temperature take a look at price. Then, a replacement arch-formed clamping plate structure is presented. The transient electromagnetic field and eddy-current losses of end regions with ancient fan-formed and new arch-shaped stator clamping plate structures are calculated by time-stepping finite-element methodology and are compared. Calculation results indicate that the new arch-shaped clamping plate structure can effectively reduce the eddy-current loss of stator clamping plate.


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