In the AC GIS bus

the charged moving sub-millimeter powder metal particles are easily adsorbed on the surface of the insulator

which seriously threatens the insulation performance of the equipment. Particle traps are often used in engineering to suppress them. To this end

this paper designs a hole-pulling particle trap with a baffle

and builds a UHV AC GIS particle capture platform for experimental verification. The experimental results show that the hole-pulling trap with baffles is 15.3% and 24.5% higher than that of the up-lifting trap and the ordinary hole-pulling trap

respectively. In this paper

the initial take-off voltage of particles is obtained by experiments

the charge amount of particles is corrected

and the electrostatic-fluid-particle multi-physical field coupling model is constructed. The spatial distribution

trajectory and hole-pulling trap capture efficiency of particles are calculated

and the accuracy of the model is verified. Based on this

the capture efficiency is taken as the objective function

and the influences of the structural parameters of the baffle on the capture performance of the hole-pulling trap are systematically studied. The results show that

within the optimized range of the trap structure size

the diameter

thickness and lifting height of the baffle are the key factors affecting the capture efficiency of the hole-pulling trap. Moderately increasing the size can strengthen the axial electric field and expand the range of motion of the particles in the axial direction. However

excessively large size will trigger the shielding effect

weaken the radial electric field at the edge of the trap

and induce particle stagnation

thus the capture efficiency of the pull-out trap will increase first and then decrease. Finally

under the design requirements of the internal electric field of the GIS bus

the capture efficiency of the pull-out trap reaches 74.5%

which can provide a theoretical support and engineering reference for improving the reliability of GIS insulation.