Simulation Study on GIS Partial Discharge Location Based on EMTR-DBSCAN

Accurately detecting and locating partial discharge (PD) in gas-insulated switchgear (GIS) is critical for identifying insulation defects and improving maintenance efficiency. Recently, electromagnetic time reversal (TR) technology has emerged as an effective location method for PD. The TR process typically involves three steps: (1) recording the PD propagation signal via a sensor, (2) time reversal, and injecting the signal back into the medium, and (3) using appropriate criteria to determine the focal point corresponding to the location of the PD source. However, determining the focal time in current TR location can be challenging. To address this problem, we propose a PD location method based on TR-DBSCAN and verify its effectiveness in locating PD sources in GIS using CST simulation. We use the DBSCAN clustering algorithm to locate PD sources based on the difference between the waveforms at the signal source and non-signal source positions. This approach solves the issue of determining the focal time in three-dimensional space. The results demonstrate that our proposed method achieves precise location of PD sources in GIS with significant improvements in location accuracy.