In this paper

40.5 kV air-insulated switchgear is taken as the research object

and its insulation characteristics are explored. First

the electric field simulation calculation of air-insulated switchgear is analyzed. Second

based on the electric field simulation

the insulating rod shed and pole shed of the circuit breaker in the air-insulated switchgear are improved and optimized. The results show that the single improvement of the shed of insulated pull rod has the best optimization effect

the field strength distribution is obviously improved

the final field strength is decreased by 16.7%

and the operation performance of circuit breaker of the air-insulated switchgear is improved. Finally

according to the electrical aging test

the four parameters including partial discharge

insulation resistance change

relative dielectric constant

and current leakage of the switchgear samples are taken as the indicators to analyze and characterize the electrical aging performances. The results show that

the four parameters can effectively reflect the real-time operation of air-insulated switchgear

so corresponding adjustment measures can be made in time to alleviate or avoid the aggravation of insulation deterioration and the occurrence of faults. The research work provides some data support and preventive measures for improving the insulation performance of air-insulated switchgear.