Pulse sequence analysis-based characterization of corona and surface discharges under DC voltages

Coban M., FİRUZİ K., TEZCAN S. S.

ELECTRIC POWER SYSTEMS RESEARCH, vol.250, 2026 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 250
  • Publication Date: 2026
  • Doi Number: 10.1016/j.epsr.2025.112168
  • Journal Name: ELECTRIC POWER SYSTEMS RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Compendex, Environment Index, INSPEC
  • Middle East Technical University Affiliated: Yes

Abstract

Partial discharge (PD) measurement under direct current (DC) stress has been receiving increasing attention due to the increasing prevalence of medium voltage (MVDC) and high voltage (HVDC) systems and cable technologies. Since PD patterns differ significantly under DC voltage from those under alternating current (AC) stress, this work presents a comprehensive investigation of the PD pattern under DC voltage by considering both corona and surface discharge scenarios. Surface discharges were simulated on glass dielectric samples, while corona discharges were built in needle-plane geometry under both positive and negative polarities. Pulse sequence analysis and statistical evaluations of discharge characteristics revealed different behaviors under positive and negative polarities as well as other factors like the level of threshold used to detect PD pulses, the number of pulses used to construct a pattern, noise levels and multisource PDs. The findings emphasize the robustness of various PD patterns under these conditions and the suitability of each pattern for analyzing PD data.