Solid insulators play a crucial role of electrical insulation in gas insulated power equipment. In order to improve the insulation performance of the solid insulators, two technical points should be considered, the first is the improvement of the insulation performance and the second is the control of the electric field distribution in and around the solid insulating spacers. These techniques lead to a more complicated structure of the equipment and increase the manufacturing cost. Thus, it is necessary to propose a new concept on solid spacers with keeping their simple structure and
configuration. In this paper, a functionally graded material (FGM) is proposed to minimize the electric field distribution around the spacer, specially, on triple junction point, which was one of the important factors dominating a long-term insulating property of solid delectric. Finite Element Method (FEM) has been used throughout this work, for its favorable
accuracy, to calculate the electric field distribution inside the bus duct. The effect of hemi-spherical radius and length of particle on maximum electric
field at triple junction point is also discussed. Electric field relaxation effect (EFGM / Euniform) by introduction of the U-shape FGM spacer is also
presented. The electric field distribution along the surface of FGM of disc spacer with presence of multi-contaminating particles at various positions is
presented. |
