Electric field analysis at the end of large generator stator windings

Because the electric field at the end of generator stator windings is pockety, it is easy to cause electric corona and lead to accidents. Although the distribution of electric field is improved by adding semiconductor layers whose electric resistivity is different in different location of the windings, its efficacy can´t be identified quantitatively. So it is necessary to put forward a method to analyse the distribution quantitatively. This paper describes the basic theory of improving the electric field distribution at the end of large generator stator windings, and presents a quantitative method of analysing the distribution through measurement on practical generator, and it will be helpful to solve how to make the distribution more well-distributed in the future.