During the operation of the high-voltage switchgear

the uneven electric field will cause a high field strength area inside or on the surface of the insulating medium

which will endanger the safe and reliable operation of the power equipment. Aiming at the 12 kV armoured removable AC metal enclosed switchgear

this paper uses Ansys Maxwell to establish a three-dimensional transient electric field simulation model of the switchgear cable room

and obtains the electric field distribution characteristics and electric field concentration area of the switchgear cable room at the 10 kV system nominal voltage. Based on this

the effects of different bus voltage values and three-phase voltage imbalances on the contact box

arrester

grounding switch post insulator

and the node of the largest electric field strength between the bus bars are studied. The simulation results show that the electric field inside the contact box

the high-voltage side of the arrester

and the contact between the grounding switch pillar insulator and the static contact is more concentrated. What’s more

the different bus voltage values and three-phase voltage imbalance have a great impact on the transient electric field that the above components bear. The electric field simulation results in this paper have certain reference value for improving the electric field distribution inside the switchgear and on-site operationandmaintenance.