The Boundary Problem of Stator Insulation Calculation of Large Hydrogenerator and Three-dimensional Finite Element Analysis and Exploration of Electric Field

Abstract

This article introduces the difficulties in the calculation method of the circuit model of stator bar insulation structure in large hydrogenerators firstly, introduces finite element analysis and its basic ideas as well as general steps in establishing model secondly, and then introduces the theoretical basis of finite element analysis in electromagnetic field so as to elicit the Maxwell's equations. Aiming at the situations that the differential equations meeting electromagnetic field in practical work cannot get the certain result, this article explores the boundary conditions in solving three kinds of differential equations. Finally, applying the tetrahedral meshing, this article lists out equation set to solve the three-dimensional finite element in electric field.