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Based on the insulation structure in stator slot of typical generators, this paper presents an analytical illustration to the fault expansion cause of turn-to-turn insulation failure through the fault example. The equivalent circuit is built up for analyzing the solid insulation layer with defects such as air bubble, and the partial discharge (PD) condition is studied according to the electric field calculation results. A 2-D finite element (FE) model of insulation structure in a 6kV synchronous generator stator slot is set up and solved in electrostatic field. Both the result of FE analysis and equivalent circuit model calculation can verify with each other, which means the electric field distribution in stator slot can be solved with accuracy in detail by using the FE method, furthermore, the conclusion can benefits the generator insulation optimizing design. Keywordsmedium voltage; synchronous generator; insulation structure; electric field calculation and simulation

Research on Electric Field Computational Simulation of Medium Voltage Generator Insulation Structure with Air-Filled Void Defects