Dead tank clean air insulated switchgear is an ideal upgrade solution of environmental-friendly switchgear. Compared to cubic-type switchgear

its insulation performance is better and

however

the problem of high current heating and temperature rise is still prominent. In this paper

the modeling

comparison and calculation of the spring contact finger connection and three-phase busbar of a kind of 40.5 kV dead tank clean air insulated cabinet are performed from the point of view of reducing heating power. The electrical connection model of a kind of V-shaped spring contact finger is set up by using finite element method

and the influence of alternating electromagnetic field on shunting of the parallel contact finger is calculated. The current flow and power loss differences between double and single spring contact fingers are compared. The influence of contact finger material on heating is quantitatively calculated

and a kind of preferred cobalt bronze double spring contact finger electrical connection scheme is confirmed. The influence of skin and proximity effect on the heating power of the three-phase conductor is studied by way of setting up a three-dimensional electromagnetic field model of the three-phase busbar. The alternative aluminum alloy material is compared

and a high conductivity aluminum alloy hollow conductor is confirmed as the preferred design scheme. The differences in AC and DC resistance of the busbar conductors are calculated and compared. The conclusions and modeling as well as simulation methods obtained in this paper have guiding significance for the design of contact finger and conductor of AC high current environmentally friendly electrical products.