To investigate the ultrasound produced by the impact between spherical metal particles and electrode in DC GIL for online monitor of spherical metal particle motion

an experimental platform was set up for spherical metal particle motion in parallel plate electrodes under DC voltage.The ultrasonic signals generated by the impact between the aluminum particles and low-voltage electrode were obtained in the conditions of different voltage and particle sizes.And the amplitudes of the ultrasonic signals were extracted by the self-coded computer program to show that the amplitude increases with the augmentation of voltage and particle size under same condition.A mechanical model of the impact between the aluminum particles and the electrodes was established based on Ansys/LS-DYNA

hence the change of contact force during the impact process was achieved.Simulation illustrated that the contact force first increases and then decreases

thus a maximum value exists.At last

the correlation between the maximum contact force and the amplitude was analyzed

and it was shown that the maximum contact force is proportional to the amplitude.