الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Generators are sophisticated machines used to convert the mechanical energy of a prime mover into electrical energy. Electromagnetic and mechanical losses accompany this energy conversion process; hence cooling system is used to remove the generated heat by losses from these machines. This thesis describes a study of the steady state and transient temperature rise of Siemens air cooled synchronous generator, which is driven by a gas turbine, whose rated power is 313 MVA at 3000 rpm.
Three phase synchronous generators are the primary source of all the electrical energy we consume. The heating of the stator and field windings of a synchronous generator is the most significant limit in its operation. The proposed model involves figuration and solution of the heat conduction equation of a two dimensional mathematical thermal model to study steady-state and transient thermal performance inside a 3-phase air cooled synchronous generator using the finite-element technique. Boundary conditions in the heat transfer process such as the convective and radiative heat transfers are completely involved in this study. Different loading, ambient temperature, and cooling conditions have also been considered.
Finite-element method is used to study the steady-state and transient thermal per-formance inside a 3-phase air cooled synchronous generator. Finite Element Method is a powerful computational technique for approximate solutions to a variety of ”real-world” engineering problems having complex domains subjected to general boundary conditions. The numerical simulation of the heat transfer analysis was implemented using ANSYS 14, which is a finite-element method based software package for heat transfer problems. The numerical solutions are compared with actual measurements that obtained from Kureimat station in Egypt, and with Siemens test report.
The methodology introduced in this thesis, if implemented at the design stage, may provide great services.