Multi-channel parallel connection is a trend of vacuum circuit breaker(VCB) at generator outlet

and the proximity effect and magnetic arc blow caused by parallel connection affect the VCB's breaking capability. First

finite element simulation of 6-way parallel VCB is conducted

and the proximity effect of contact plate caused by transverse magnetic field(TMF) from neighboring road and the TMF distribution in cross-section of the arc during breaking are analyzed. To shield the neighboring TMF

a non-uniform thickness aluminum shielding cover is designed

and the distribution of magnetic field and eddy current loss of aluminum shielding cover are also investigated. Second

the radial basis function neural network (RBFNN) model is constructed in which the thickness at the opening of the shielding cover

the thickness in the middle

the radius and the length of the shield are taken as inputs

and the radial asymmetry of the TMF distribution of the arc cross-section and the eddy current loss of the shielding cover are teken as outputs; moreover

the shielding cover structure is optimized by non-dominated sorting genetic algorithm-Ⅱ (NSGA2). It is shown that the shielding cover has better shielding capability and smaller eddy current loss when the thickness at the opening is 14.50 mm

the thickness at the center is 5.53 mm

the radius is 110.12 mm

and the length is 258.81 mm. Finally

the transient shielding capability of aluminum shielding cover during the VCB breaking is tested

and it is shown that aluminum shield has good shielding capability for TMF of three-phase short-circuit fault breaking.