| The mathematical models and methods for predicting the coupled eddy and temperature field arising from negative sequence current in a turbogenerator, and the distribution of the eddy current and temperature fields of a 1055MVA/27kV(950 MW turbogenerator are studied.Firstly, a series of mathematical models and methods for numerical analysis of the eddy current and thermal fields are developed based on the finite element method, with the goal of proving flexible computation tools for engineering application.Secondly, by comparing the advantages and disadvantages of different solution methods of coupled physical fields, the sequential analysis method is employed in the proposed study, and the corresponding mathematical models for coupled negative sequence eddy current-temperature field developed.Thirdly, the accuracy and effectiveness of the aforementioned mathematical models and methods as well as the feasibility using ANSYS software for solving coupled electromagnetic-thermal fields are verified by solving some prototype and well designed problems.In the final, the eddy current and temperature fields of a 1055MVA/27kV (950MW) turbogenerator are studied, and some useful conclusions are drawn. |
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