TY - JOUR
T1 - Analysis of Partial Discharges in Oil-Impregnated Transformer Paper Insulation and PET-G Insulation
AU - Kameli, Sayed Mohammad
AU - Abuelrub, Abdelaziz
AU - Saleh, Mohammad Al Shaikh
AU - Refaat, Shady S.
AU - Ghrayeb, Ali
AU - Abu-Rub, Haitham
AU - Olesz, Marek
N1 - © 2022 IEEE. This is an open access article distributed under the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
PY - 2025/3/28
Y1 - 2025/3/28
N2 - Partial discharge (PD) is a widespread phenomenon instigated in power transformer (PT) insulation systems. PDs are triggered by voids that vary in size and position within the PT insulation. The electrical characteristics of those damaging, PD-causing cavities must be well understood, to accelerate the development of advanced PD detection techniques. Thus, the impact of varying the radius and position of spherical air voids on the characteristics of PDs in PTs is examined using a 3D finite element analysis (FEA) model designed in COMSOL Multiphysics. The spherical voids are positioned between two windings of a 512 kV, three-phase (3ϕ) PT. The peak electric field (EF) and aggregate energy in the FEA model are used in conjunction with laboratory measurements of the apparent discharge magnitude, for detailed analysis of Polyethylene Terephthalate Glycol (PET-G) based cylindrical voids with different heights. Simulations demonstrate that the inception of PD activity in the PT model occurs for spherical voids with a radius exceeding 1 mm. Furthermore, the most severe PDs occur within the press-board insulation, adjacent to the uppermost part of the innermost windings. Experiments demonstrate that a significant increase in PD activity was observed for PET-G based cylindrical voids with heights exceeding 1 mm.
AB - Partial discharge (PD) is a widespread phenomenon instigated in power transformer (PT) insulation systems. PDs are triggered by voids that vary in size and position within the PT insulation. The electrical characteristics of those damaging, PD-causing cavities must be well understood, to accelerate the development of advanced PD detection techniques. Thus, the impact of varying the radius and position of spherical air voids on the characteristics of PDs in PTs is examined using a 3D finite element analysis (FEA) model designed in COMSOL Multiphysics. The spherical voids are positioned between two windings of a 512 kV, three-phase (3ϕ) PT. The peak electric field (EF) and aggregate energy in the FEA model are used in conjunction with laboratory measurements of the apparent discharge magnitude, for detailed analysis of Polyethylene Terephthalate Glycol (PET-G) based cylindrical voids with different heights. Simulations demonstrate that the inception of PD activity in the PT model occurs for spherical voids with a radius exceeding 1 mm. Furthermore, the most severe PDs occur within the press-board insulation, adjacent to the uppermost part of the innermost windings. Experiments demonstrate that a significant increase in PD activity was observed for PET-G based cylindrical voids with heights exceeding 1 mm.
KW - Dielectric breakdown
KW - high-voltage techniques
KW - insulation
KW - partial discharges
KW - power transformer
UR - http://www.scopus.com/inward/record.url?scp=105001875436&partnerID=8YFLogxK
U2 - 10.1109/OJIM.2025.3555323
DO - 10.1109/OJIM.2025.3555323
M3 - Article
AN - SCOPUS:105001875436
SN - 2768-7236
SP - 1
EP - 11
JO - IEEE Open Journal of Instrumentation and Measurement
JF - IEEE Open Journal of Instrumentation and Measurement
ER -