Results 31 to 40 of about 95 (94)

Label‐Free Partial Discharge Severity Assessment in Gas‐Insulated Switchgear via Semantic‐Guided Unsupervised Domain Adaptation

IET Science, Measurement &Technology, Volume 20, Issue 1, January/December 2026.
A semantic‐guided unsupervised domain adaptation network (UDAN) is proposed for label‐free partial discharge severity assessment in gas‐insulated switchgear. The method combines PD measurement signals and inspection‐record semantics to achieve robust cross‐domain condition assessment through feature alignment and adversarial adaptation.
Zhengyang Wu, Wenfeng Liao, Huaping Shan, Guobao Zhang, Yutong Fan, Yanxin Wang, Jing Yan   +6 more
wiley   +1 more source

DGA Distribution Model for Discharging Deterioration of Converter Transformer in Various AC‐DC Composite Voltage Ratios and Statistical Diagnosis

The Journal of Engineering, Volume 2026, Issue 1, January/December 2026.
This paper proposes a statistical DGA diagnosis method to evaluate the occurrence and type of the discharge starting stage of the converter transformer based on a statistical analysis of the gas generation amount in the converter transformer oil during operation.
Kwang Hui An, Won‐Chol Yang, Chol Hong Pak   +2 more
wiley   +1 more source

Comparison of PD and Breakdown Characteristics Induced by Metal Particles and Bubbles in Flowing Transformer Oil

IEEE Access, 2019
Metal particles and bubbles are two typical impurities in transformer oil that can cause partial discharge (PD) and even electric breakdown. The PD characteristics are closely related to the motions of these impurities in flowing transformer oil. In this
Yongze Zhang, Ju Tang, Cheng Pan, Xinyu Luo   +3 more
doaj   +1 more source

Investigating New Approaches for Optimal Energisations of DC Cables: The Stepwise Energisation Technique

High Voltage, Volume 10, Issue 6, Page 1371-1379, December 2025.
ABSTRACT This paper focuses on the energisation of high voltage DC (HVDC) and medium voltage DC (MVDC) insulation systems, referring mainly to cables for both theoretical development and validation testing. Cable system energisation can be frequent during its lifetime, and it can possibly be affected by partial discharges (PD), because of manufacturing,
Gian Carlo Montanari, Sukesh Babu Myneni, Grazia Berardi, Marco Albertini, Stefano Franchi Bononi   +4 more
wiley   +1 more source

Partial Discharge Detection Method of Fibre‐Composed HVDC Submarine Cable Based on φ‐OTDR and Hilbert Demodulation

High Voltage, Volume 10, Issue 6, Page 1380-1389, December 2025.
ABSTRACT Partial discharge (PD) is the indicator of the insulation defect in cables. However, the pulse current method, which is widely adopted in land cables, cannot obtain PD signals of high‐voltage direct current (HVDC) submarine cables due to attenuation and installation position.
Hang Wang, Haoran Zhang, Lei Li, Shuai Yang, Jun Chen, Bangdou Huang, Cheng Zhang, Tao Shao   +7 more
wiley   +1 more source

Transformer components impact on compatibility of measured PDs: comparison of IEC60270 and RF methods

High Voltage, 2018
Power transformer partial discharge signal measurement using Radio Frequency method has advantages over IEC 60270 ‘apparent charge’ measurement method for online monitoring due to greater immunity against external interference.
Keyvan Firuzi, Mehdi Vakilian, B. Toan Phung, B. Toan Phung, Trevor Blackburn   +4 more
doaj   +1 more source

The Partial Discharge Characteristics of Inner Air Gap Inside High‐Voltage Cable Termination for High‐Speed Trains

High Voltage, Volume 10, Issue 5, Page 1110-1124, October 2025.
ABSTRACT The air gap at the interface inside the cable terminations for high‐speed trains and the partial discharge caused by it are two important factors affecting the insulating performance. The development of air gap and partial discharge will eventually lead to breakdown faults.
Dongli Xin, Guangning Wu, Guoqiang Gao, Kui Chen, Kai Liu, Yunlong Xie, Mu Lin, Bo Li   +7 more
wiley   +1 more source

Separation Maps for Classification of Multiple Partial Discharges: A Comparative Study Focusing on Time and Frequency Characteristics

High Voltage, Volume 10, Issue 5, Page 1176-1189, October 2025.
ABSTRACT Electrical insulation faults produce partial discharges (PD), which can be analysed to identify specific types of defects. PD clustering is a widely used method to identify PD sources, although its success depends largely on the feature maps used.
Jannery Rivas, Omar Rivera‐Caballero, Héctor Poveda, Jorge Alfredo Ardila‐Rey, Carlos Boya‐Lara   +4 more
wiley   +1 more source

Effect of electric field on bubble generation and dissolution characteristics in oil–paper insulation

High Voltage, Volume 10, Issue 2, Page 480-492, April 2025.
Abstract The interturn paper insulation of oil‐immersed power transformer windings, under the combined influence of electric fields, moisture, and conductor heating, will produce bubbles, which pose a significant threat to the insulation system. However, there is limited research on the characteristics of bubble evolution in oil–paper insulation under ...
Chaojie Yang, Tao Zhao, Yunpeng Liu, Jiajun Yang, Jiaxue Xu, Yingcong Xu   +5 more
wiley   +1 more source

Insulation Fault Mechanism of 750 kV GIS Equipment Based on COMSOL Multiphysics Simulation Analysis

Journal of Electrical and Computer Engineering, Volume 2025, Issue 1, 2025.
Gas‐insulated switchgear (GIS) is pivotal in high‐voltage transmission systems owing to its compact design, high reliability, and superior dielectric strength, facilitated by sulphur hexafluoride (SF6). However, metallic contaminants, introduced during manufacturing or operation, pose a substantial threat to the insulation integrity.
Liqing Dai, Tiesheng Xu, Manuela Minetti
wiley   +1 more source