Using finite element analysis software Ansys to establish a 3D models

the presence of the contact box for high voltage switchgear bus room in bubble defects are simulated. In the exchange situation to study changes in the electric field near the defects

under the case of local defects and defects of different sizes and different locations of the defect. The results show that: the defect resulting in the electric potential concentrate at the upper half of the bubble;electric field intensity near the defect have obvious distortion

the electric field intensity in the center of defect become large;the bigger of defect

the bigger of electric field distortion;the location of the defect does not have much impact on the distortion of the electric field;the increase of the voltage level make the distortion of electric field is more obvious.