The standard capacitor has excellent characteristics such as excellent voltage coefficient and temperaturecoefficient

small dielectric loss

stable capacitance and so on

which is widely used in high voltage measurement asa reference or the high voltage arm of divider. The parallel plate capacitor has a simple structure with shielding elec-trode

but its simple structure makes the outer wall of the potential distribution is not very ideal

which is easily tocause flashover. This paper establishes the calculation model of 1200 kV standard capacitor voltage divider

by mod-eling and simulation

the author puts forward a new potential distribution optimization method with multilayer boardswall inside. The simulation results show that this method can make the capacitor external potential distribution curvetends to be linear and further optimization.