The traditional impulse voltage generating device is of open-type tower structure

possessing huge volume and weight. So disassembly is needed for transport

and the field test is a rather complicated work and needs many professionals. In this study

the a 3 000 kV/300 k J compact integrated impulse voltage generator with closed gas insulation structure was designed

including the optimization design of internal devices such as resistance and ignition ball gap

and the electric field simulation of the main body. The whole body size of the generator is reduced by about 37%% and the weight is reduced by about 25%

compared with the traditional device. This generator takes the scheme of horizontal for transport and vertical for work without on-site assembly

greatly improving the field working efficiency. This gas-insulated impulse voltage generator was tested in accordance with national standards

its performance indexes met the requirements

and it can effectively solve difficult on-site test problems for ultra-high voltage GIS and other substation equipment.