Switchgear is an important power equipment in power system.The insulation components in the switchgear will be affected by different aging conditions（pollution aging

moisture condensation aging

cold and hot cycle aging

thermal aging

etc.） under actual working conditions.In order to explore the influence of different aging conditions on the insulation performance of switchgear insulation parts

based on the actual operating conditions of the switchgear

a comprehensive consideration of the influence process of the conductive circuit heating

moisture and condensation

cold and hot circulation

pollution and other factors on the performance of the insulation aging in the switchgear.The influence process of insulation performance aging of switchgear caused by conductive circuit heating

moisture and condensation

cold and hot circulation

pollution and other factors is comprehensively considered.By carrying out simulation tests under different combinations of factors

the partial discharge and withstand voltage

of the insulation under different aging conditions are tested to assess the impact of various aging factors on the insulation performance of the switchgear.The experimental results show that the dirty aging which reduces the halo and extinction voltage of the insulator can also reduce the withstand voltage of the insulator.The more serious the dirty aging is

the more obvious declinating of the insulator’ s withstand voltage is.With consideration of the moisture condensation aging

the halo and extinguishing voltage of the insulator will be greatly reduced

as well as the partial discharge value will be greatly increased.If further considering the thermal aging

the halo and extinguishing voltage of the insulator is further weakened.Meanwhile

the thermal aging can reduce the halo voltage and extinction voltage of the bushing and contact box

and slightly reduce the withstand voltage performance.