Analysis of the Deterioration Effects of Stator Insulation on the its Electro-Thermal Property

Electrical machinery especially electric generators which are the main parts of any electrical network, through the time and everyday functions like any other electrical devices experience a series of electrical, mechanical and thermal stresses. Continuous of this transient and stable tension over the time, cause lasting effects on the machine insulation parts, especially the insulation of stator slot which is the most important part of the insulation in machines. These events include creation of voids in the various layers of insulation; creation the gaps between layers of insulation and increasing the insulation dissipation factor due to change in capacitance of insulation. Therefore, in this paper we tried to analysis the impact of these destructive factors on the stator slot insulation electro-thermal analysis using finite element analysis and finally estimate the remaining life of the insulation in these cases with regard to the effect of the electrical and thermal stress simultaneously. Keywords—Deterioration, estimated life, generators, void