In recent years

the frequent fault of dry-type air-core shunt reactor in the operation not only threatens safe operation of power system

but also causes great economic losses. Excessive strong electric field strength of the dry hollow reactor will lead surface discharge of the reactor sphere gap and

once in the event of partial discharge of sphere gap

the insulation of polyester film is corroded

causing further dielectric breakdown and threatening safe operation of power system. Therefore

a model of one unit of BKDK-20000/35 dry-type air-core reactor is set up by way of finite element simulation software and its numerical calculation so to analyze its electric field distribution and study the influence of electric field on the insulation of air-core reactor.