Results 41 to 50 of about 1,696 (209)

Evaluation Methodology, Numerical Verification and Retrofilling Procedure for Power Transformers to Ensure K‐Class Flame Retardancy and Environmentally Friendly

High Voltage, EarlyView.
ABSTRACT With increasing demands for fire safety and environmental friendliness, retrofilling transformers with alternative insulating liquids has become a growing trend. However, retrofilling power transformers remains uncertain, as more residual mineral oil compromises K‐class flame retardancy, and its impact on environmental performance has yet to ...
Zhenfu Tang, Yihua Qian, Dan Zhou, Wei Hu, Feipeng Wang, Yang Xu   +5 more
wiley   +1 more source

Modelling and identification for reduction of overvoltage transients

IEE Proceedings - Electric Power Applications, 2003
The main problems that appear when using a long cable connection between a Variable Frequency Drive (VFD) and the AC motor are over-voltages and bearing currents. The last one concerns especially EMC, while the over-voltage transients can be fatal to the motor.
Capitaneanu, Stefan, de Fornel, Bernard, Fadel, Maurice, Jadot, Fabrice, Malrait, François   +4 more
openaire   +2 more sources

Correlated Transient Response of Buried Cables and Lightning Channel Radiation of Return Strokes of Five Rocket‐Triggered Lightning Strikes

High Voltage, EarlyView.
ABSTRACT Data from five rocket‐triggered lightning flashes are adopted to analyse the correlated transient response of buried cables and lightning channel radiations. These five flashes have the same termination point that is right above the buried cables and involve a total of 32 return strokes.
Mi Zhou, Xiaoyu Lei, Li Cai, Jianguo Wang, Weihan Zhao, Jinxin Cao, Denglei Duan, Maorong Geng, Yadong Fan, Jianping Wang   +9 more
wiley   +1 more source

Arc Resistance Enhancement of Converter Transformer Tank Through Structural Improvements: Simulation and Experimental Validation

High Voltage, EarlyView.
ABSTRACT Currently, limited research exists on the structural response and protection methods of the converter transformer tank for ± 800 kV ultra‐high voltage direct current transmission project to high energy arc faults. This research investigates the dynamic response and the vulnerable areas of the ultra‐high voltage converter transformer under the ...
Ke Wang, Shuqi Zhang, Yikun Zhao, Yichen Wang, Zongliang Zhang, Jinhua Zhang   +5 more
wiley   +1 more source

Research on Transient Overvoltage Characteristics and Mapping Relationships of Photovoltaic/PMSG Under Electromagnetic/Electromechanical Models

IET Renewable Power Generation
As the ‘dual carbon’ goals continue to advance in China, the grid‐connected scale of new energy power generation equipment such as wind power and photovoltaic power is constantly increasing.
Shiyun Xu, Shiqi Liu, Shuyan Wang, Jingtian Bi, Tiankai Lan   +4 more
doaj   +1 more source

Research on transient AC overvoltage suppression method of DC sending end based on novel fast-excitation MCR

International Journal of Electrical Power & Energy Systems
The growing reliance on high-power high-voltage direct current (HVDC) transmission systems has intensified challenges associated with transient AC overvoltage induced by commutation failures resulting from converter operation characteristics.
Xiyu Yin, Xiaoyue Chen, Linyu Zhang, Shan Li, Yujie Ding, Rui Song, Chunlai Li   +6 more
doaj   +1 more source

Infeasibility Analysis of Half-Wavelength Transmission Systems

Energies, 2018
This paper analyzes the infeasibility of half-wavelength transmission systems in the aspects of power-frequency overvoltage and synchronization stability. The circuit model of the long-distance transmission system is established at first for steady-state
Zheng Xu, Jian Yang, Nengjin Sheng
doaj   +1 more source

Study on Impurity Particle Detection in Transformer Oil Based on Microflow Imaging Method

High Voltage, EarlyView.
ABSTRACT The concentration of particles in transformer oil has a significant influence on its electrical performance, making oil cleanliness a critical parameter in the operation and maintenance of power transformers. However, the light obstruction (LO) method recommended by current standards has inherent limitations, including low sensitivity to ...
Chen Chen, Lijun Yang, Wu Zhao, Zhengyu Chen, Xinxi Yu, Yong Li, Ruijin Liao   +6 more
wiley   +1 more source

Research on Lightning Overvoltage Characteristics of High-Voltage Diode Rectifier

, 2022
Failure of the high-voltage diode rectifier caused by lightning will cause huge losses. The traditional analysis of overvoltage induced by the high-voltage diode rectifier shell under lightning stroke cannot adapt to the overvoltage process caused by ...
Guoping Peng, Jun Zeng, Ping Yang, Chuanming Fu, Yangbo Liu, Ben Shi, Hongzhan Wang   +6 more
core   +1 more source

Transient Overvoltage Analysis in the Medium Voltage Substations Based on Full-Wave Modeling of Two-layer grounding System [PDF]

, 2022
In this paper, a comprehensive investigation of substation grounding soil structure effects on switching/lightning transients is presented. The full-wave computational solution Method of Moments (MoM) is adopted to solve Maxwell's equations.
Bak, Claus Leth, Shayegani, Amir Abass, Silva, Filipe Miguel Faria da; id_orcid, Ghomi, Mohammad   +3 more
core   +1 more source