At present there are several methods for calculating temperature for inner-cooled stator coils for large electric generators. Determining the highest temperature in a stator coil is very important and is a major limiting factor for the maximum capability of steam turbine synchronous generators.
The load current in the stator winding causes losses in the conductor resistance. That same current excites leakage fluxes that link contours inside the conductors causing non-uniform current distribution and additional losses. these additional losses are caused by eddy currents induced inside the stator coils. These eddy losses are grouped as radial flux losses, cross slot flux losses, deep bar losses, and circulating current losses. The effects of the various eddy losses vary greatly depending on the type of stator coil construction. With every new design of stator coil cross-section and construction, a method of accounting for the associated eddy losses must be revisited.
The intent of thesis is to develop and calculate the deep bar and cross slot flux losses in roebel stator coils with solid end connections. the losses calculated by this thesis will be used in existing temperature programs to determine hot spot temperatures along the coil side of large hydrogen inner-cooled electric generators.
Master of Science (M.S.)
College of Engineering
Electrical and Computer Engineering
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Length of Campus-only Access
Masters Thesis (Open Access)
Orlando (Main) Campus
Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic
Amos, John D., "Calculating Cross Slot Flux Losses in High Voltage Stator Coils" (1995). Retrospective Theses and Dissertations. 3138.