The influence of varistor disk capacitance of MOV arrester on its voltage distribution

The influences of varistor disk capacitance and its distribution on the voltage distribution along an MOV arrester column were investigated. The numerical computation of voltage (or gradient) distribution of the 110 kV-class arrester with a composite housing (or shell) and a porcelain housing were presented respectively. The finite element method (FEM) was used for this computation. The measurement and statistical analysis of processing varistor disk capacitances were also taken. After rearranging the varistor disks, according to their capacitance, the voltage distribution of the arrester became more uniform. The optimal voltage distribution was described using an adaptive method