Results 231 to 240 of about 142,277 (291)

Influence of Arc Faults on Pressure Production Characteristics in AC Turret of UHV Transformers

High Voltage, EarlyView.
ABSTRACT The overpressure caused by arc fault in the oil tank can lead to a transformer explosion. Since the AC turret of transformers serves to connect the transformer windings with the AC busbar, the arc current can be extremely high if an earth fault arc occurs leading to potentially hazardous pressure.
Yuhang Li, Yuanxiang Zhou, Guimin Jiang, Licheng Lu, Hongchuan Dong   +4 more
wiley   +1 more source

Research on Ultra‐Wideband Pulse Current Method for DC Partial Discharge Measurement

High Voltage, EarlyView.
ABSTRACT The conventional pulse current method is commonly used in AC or DC withstand voltage tests with partial discharge (PD) monitoring. Because of its relatively narrow measurement bandwidth, this method tends to ignore critical information in PD waveforms, making it difficult to eliminate pulse‐type interference under DC voltage conditions, where ...
Kaining Hou, Zhaoyang Kang, Dongxin He, Hongshun Liu, Qingquan Li   +4 more
wiley   +1 more source

Corrosion Failure Analysis of Contactor Type Electrical Connection Components Used in Converter Valve Side Bushings

High Voltage, EarlyView.
ABSTRACT As a commonly used bushing current‐carrying structure in recent years, contactor‐type electrical connection parts operate in a complex environment of electric, thermal and chemical corrosion for extended periods. With the increase of ultra‐high voltage (UHV) transmission capacity, its operating environment faces more stringent challenges, and ...
Qingyu Wang, Tao Xie, Shoufeng Jin, Huidong Tian, Xiaoyu Zhou, Shifeng Shi, Kanghang He, Juzhen Wu, Peng Liu, Zongren Peng   +9 more
wiley   +1 more source

A Novel Converter Transformer DAM‐LSTNet Vibration Generation Model for Data Imbalance Identification

High Voltage, EarlyView.
ABSTRACT Converter transformer vibration failures, primarily because of winding and core vibrations, severely impact the safe operation of high voltage direct current (HVDC) systems. These vibrations are influenced by voltage and current, and are transmitted through transformer oil and structural components to the tank. Current numerical models fail to
Peiyu Jiang, Fanghui Yin, Liming Wang
wiley   +1 more source

Electrical Breakdown Analysis of Emerging Oil–Paper Insulation Systems

High Voltage, EarlyView.
ABSTRACT This investigation addresses the effect of particulate additives on the electrical breakdown strength of the oil impregnated insulation paper system. The morphological complexity is addressed by converting data from scanning electron microscope images to a data set suitable for numerical simulation analysis. Then, by using the conventional oil‐
Yue Xu, Soori Tejaswi, Kent Davey, Qian Zhang, Vaibhav Bahadur, Junyong Zhu, Robert Hebner, Zhedong Han, Felix Lin, Liangbing Hu   +9 more
wiley   +1 more source

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A Novel Three-Stage Power Electronic Transformer for AC/DC Conversion

International Symposium on Industrial Electronics, 2019
In this paper, a novel three-stage power electronic transformer (PET) is proposed for AC/DC conversion. Compared with the existing PET topologies, the feature of the proposed PET is the decreased number of the power conversion stages. The mixed-frequency
Hang Zhang, Yao-hua Li, Zixin Li, Fanqiang Gao, Cong Zhao, Yujie Hu, Ping-Jian Wang   +6 more
semanticscholar   +1 more source

Active Thermal Control of AC/DC Power Converter Considering Health Monitoring of Power Modules

Electric Ship Technologies Symposium, 2023
The evolution of power electronics devices in the semiconductor sector has created a strong need for power modules that have high efficiency and low power usage. The power package; which embraces a couple of power electronics devices such as switches and
Ali Moghassemi, Gokhan Ozkan, C. Edrington, Grace Muriithi, Zheyu Zhang   +4 more
semanticscholar   +1 more source

Minimization of AC-DC Grid Transmission Loss and DC Voltage Deviation Using Adaptive Droop Control and Improved AC-DC Power Flow Algorithm

IEEE Transactions on Power Systems, 2021
Minimization of the total transmission loss of an interconnected AC-DC grid plays an important role for the economic operation of the AC-DC grid. Different from the conventional AC grid where the transmission loss is usually minimized by reactive power ...
Yuanshi Zhang, Xuekun Meng, A. M. Shotorbani, Liwei Wang   +3 more
semanticscholar   +1 more source

Exploiting the Operational Flexibility of Wind Integrated Hybrid AC/DC Power Systems

IEEE Transactions on Power Systems, 2021
Due to inherent uncertainty and volatility, large-scale wind power integration brings new challenges to the flexible operation of power systems. It calls for more flexibility not only from the generation side but also from the grid side, especially the ...
Hanyan Huang, Ming Zhou, Shiyi Zhang, Lijun Zhang, Gengyin Li, Yikai Sun   +5 more
semanticscholar   +1 more source