Air-insulated switchgears were used widely

due to its advantage of simple manufacture process and available cost

in power grid system

industry and commercial power system. Because of different altitude level

air humidity and pollution level

so electrical strength of air in different region also is variable. Specially

air humidity and pollution heavily effect on the surface insulation performance of solid insulation components

simultaneously

on the insulation reliability of switchgear assembly. Based on the requirements of GB

IEC

IEEE and other typical common and special standard systems for switchgear

the requirements of operating environment and relevant performance evaluation standards are comprehensively combed in this paper. The purpose is to remind the switchgear design engineers to consider the impact of environmental factors on the operation reliability of switchgear in the product design stage

so as to adopt a more optimized design to meet the user requirements of different operating environments

and to ensure the reliable operation of the product.