The movement of metal particles in DC GIL will greatly reduce the insulation strength of GIL

so it is necessary to take measures such as particle traps to limit the movement. Aiming at the metal particle traps in DC GIL

firstly

we built a closed and a semi-closed coaxial cylindrical electrode experimental platform

and established the corresponding 3 D simulation model. Secondly

the parameters of the trap were optimized based on the simulation results

and the capture parameter Pcap was proposed as the design basis of particle trap. The capturing effect of particle traps with different parameters was compared as well. Finally

a targeted trap placement strategy was proposed based on the motion regularities of metal particles

and was verified by experiments. The results show that the probability of captured metal particles increases as the capture parameter increases

and when the capture parameter is about 0.8

the capture probability of motion tends to be stable. The drop points of metal particles near insulator under DC voltage have strong concentration

and performing targeted trap placement in the area where the particles are concentrated can reduce the capture time and obtain good capturing effect. Therefore

the study results can provide some guidance for the design and application of particle traps in engineering.