For determining the optimum design parameters of a 2/3 turn coil-type contact with axial magnetic field（AMF） for a 126 kV vacuum interrupter

the combined experimental design-finite element calculation-statistical analysis method is adopted to conduct single factor analysis and orthogonal regression analysis on AMF characteristics of the contact. The contact gap

single coil height

coil width

and slot length of contact plate are chosen as optimized parameters

and the axial magnetic flux density at current peak

phase shift time

and conductor resistance are chosen as optimized targets. Regression equations of AMF characteristics and contact parameters

as well as the contact parameters

which have significant influences on AMF characteristics

are obtained. Multiple objective optimization of the axial magnetic flux density at current peak

the phase shift time

and the conductor resistance is performed to achieve optimal values of the contact parameters. It is concluded that AMF characteristics become optimal when the contact gap is 20 mm

the single coil height is 15 mm

the coil width is 20 mm

and the slot length of contact plate is 30 mm. After optimization

the axial magnetic flux density at current peak increases to 0.565 T

the phase shift time decreases to 0.729 ms

and the conductor resistance decreases to 19.885 μΩ