Results 41 to 50 of about 177 (121)

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

Enhanced complete ensemble EMD with superior noise handling capabilities: A robust signal decomposition method for power systems analysis

Engineering Reports, Volume 6, Issue 11, November 2024.
Decomposition of the artificial signal by (A) EMD, (B) EEMD, (C) CEEMDAN producing 8 IMFs plus a residual, (D) impCEEMDAN producing 7 IMFs plus a residual, (E) ECEEMDAN producing 3 IMFs plus a residual and (E) expected decomposition with 3 IMFs plus a residual signal.
Manuel Soto Calvo, Han Soo Lee
wiley   +1 more source

局部放电校准仪的研究与设计

Gaoya dianqi, 2009
介绍了局部放电校准仪的设计原理,建立了局部放电校准仪的电路模型。通过对模型进行分析、计算,得出校准仪的输出电量与电阻分压比成正比。改变分压比就可以实现不同的输出电量。利用此校准仪进行测量实验,结果表明:其输出的实际电荷量满足IEC 60270标准中规定的指标。
王万岗, 吴广宁, 雷栋, 何常红, 张雪原   +4 more
doaj  

AC ripple on DC voltage: Experimental and theoretical investigation of the impact on accelerated ageing in electrical insulation

High Voltage, Volume 9, Issue 4, Page 902-910, August 2024.
Abstract With the increasing penetration of DC systems into the high voltage and medium voltage power industry, DC voltage is becoming common for distribution/transmission and to supply different typologies of loads. The allowable extent of AC ripple superimposed to DC, and its effect on insulation ageing, is a long‐term discussed topic.
Giovanni Gardan, Gian Carlo Montanari
wiley   +1 more source

Experimental qualification and sensitivity study of antipodal patch antenna structures for orientation independent detection of partial discharges

High Voltage, Volume 9, Issue 3, Page 674-684, June 2024.
Abstract Partial discharge diagnosis is an important part of monitoring and diagnosing components of the power transmission system. Four different patch antenna structures for the detection of partial discharges are investigated. These patch antennas, which are realisable in a variety of geometric structures, are already the subject of research.
Kerstin Friebe, Frank Jenau
wiley   +1 more source

A novel approach towards parametric assessment of reliability and resilience of high voltage mica‐based insulation systems by statistical analysis of experimental failure data

High Voltage, Volume 9, Issue 2, Page 495-507, April 2024.
Abstract Insulation systems in high‐voltage electric machines play a pivotal role in the reliable operation and longevity of the equipment. Mica‐based insulation materials have proven to possess and maintain excellent dielectric properties in the long run and prevent premature insulation degradation.
Shahram Negari, Davoud Esmaeil Moghadam
wiley   +1 more source

Close accord on partial discharge diagnosis during voltage harmonics in electric motors fed by variable frequency drives

IET Generation, Transmission &Distribution, Volume 18, Issue 3, Page 506-516, February 2024.
During laboratory partial discharge (PD) diagnostics, the effect of harmonic components in the voltage waveform generated by variable frequency drives (VFD) fed electric motors (EMs) is often overlooked. The proposed technique includes the impact of voltage harmonics on PD activity and can be used to plan the maintenance activities that ensure the ...
Waqar Hassan, Muhammad Akmal, Ghulam Amjad Hussain, Ali Raza, Muhammad Shafiq   +4 more
wiley   +1 more source

Partial Discharge Inception and Breakdown Voltage Analysis in PCB-Based Electrode Structures

Applied Sciences
This paper investigates partial discharge (PD) characteristics and breakdown behavior in five electrode configurations fabricated from fiberglass circuit boards, including parallel electrode (PE), triangular electrode (TE), right-angled electrode (RE ...
Tzu-Ching Tai, Shiao-Yu Andrew Bao, Bharath Kumar Boyanapalli, Cheng-Chien Kuo, Chien-Kuo Chang   +4 more
doaj   +1 more source

Analysis of Partial Discharge Measurements using Coupling Capacitor in Rotating Machine [PDF]

Iranian Journal of Electrical and Electronic Engineering
Partial discharge (PD) is a significant concern in the operation of rotating machines such as generators and motors, as it can lead to insulation degradation over time, reducing the reliability and lifespan of the machines.
Ahmad Syukri Abd Rahman, Mohamad Nur Khairul Hafizi Rohani, Nur Dini Athirah Gazata, Afifah Shuhada Rosmi, Ayob Nazmi Nanyan, Aiman Ismail Mohamed Jamil, Mohd Helmy Halim Abdul Majid, Normiza Masturina Samsuddin   +7 more
doaj