A Coupling Analysis of Multiphysical Field for ZnO Surge Arrester Installed in Photovoltaic Substation

Abstract

Conventional finite element analysis(FEA) employed in multiphysical field coupling analysis usually suffers from such drawbacks as large computational effort and heavy reliance on grid quality. Taking a 220 kV ZnO surge arrester installed in a photovoltaic substation as an example, a new multiphysical field coupling analysis is proposed based on combined FEA and meshless method to solve thermal transfer problem. Firstly, a three-dimensional fluid field FEA model is established for surge arrester to obtain the detailed fluid distributions. Secondly, the calculated convective heat transfer coefficients are taken as the boundary conditions of thermal field analysis. The FEA and meshless method are used to calculate the thermal rise of surge arrester under rated operation and aging condition. Finally, the simulation result of the proposed method are compared with that obtained by conventional FEA and experiments, which verifies the effectiveness of the proposed method with a computational speed much higher than that of the conventional FEA.

Keywords

• zno surge arrester
• meshless method
• fea
• fluid field
• thermal field
• coupling analysis