A Finite Element Analysis Model for Internal Partial Discharges Under DC Voltage

While the topic of partial discharges (PD) has been well studied for ac systems, it is immature for de systems. Although much work has been done and significant progress has been made on PD measurement and detection techniques, this is not the case for PD modeling. To address these technical gaps, a finite element analysis (FEA) model for internal PD under dc is, for the first time, developed to help understand the mechanisms behind PD under dc voltages. The model is validated through experimental studies where testing samples, one with a void and another without any void, are built using 3D printing. The sample which has a void inside will cause internal PD. There is a good agreement between the measured and simulated magnitude of charges and the frequency of PD signals under de voltages.