Results 11 to 20 of about 375,639 (295)

Zero-Sequence Differential Current Protection Scheme for Converter Transformer Based on Waveform Correlation Analysis

Energies, 2020
Through the analysis of the recovery inrush current generated by the external fault removal of the converter transformer, it is pointed out that the zero-sequence current caused by the recovery inrush may result in the saturation of the neutral current ...
Tao Zheng, Xinhui Yang, Xingchao Guo, Xingguo Wang, Chengqi Zhang   +4 more
doaj   +4 more sources

Induction Motor Fault Diagnosis Based on Zero-Sequence Current Analysis [PDF]

Energies, 2020
This paper presents some considerations regarding the application of the stator zero-sequence current component (ZSC) in the fault detection of cage induction machines, including the effects of magnetic core saturation.
Arkadiusz Duda, Piotr Drozdowski
doaj   +3 more sources

Modeling, design, and experimental test of a zero‐sequence current electromagnetic suppressor [PDF]

International Transactions on Electrical Energy Systems, 2020
This work has been supported by CNPq ‐ National Council for Scientific and Technological Development, by CAPES ‐ Coordinationfor the Improvement of Higher Education Personnel through the PDSE ‐ Doctoral Program Sandwich Abroad 7427‐12‐3, and by FCT ‐ Foundation for Science and Technology within the Project Scope: UID/CEC/00319/2019 and FCT within ...
Stefani Carolline Leal Freitas, Luis Carlos Origa Oliveira, Priscila Silva Oliveira, Bruno Exposto, José Gabriel Oliveira Pinto, João Luiz Afonso   +5 more
openaire   +5 more sources

A Control Strategy for Suppressing Zero-Sequence Circulating Current in Paralleled Three-Phase Voltage-Source PWM Converters

Applied Sciences, 2020
In microgrids, paralleled converters can increase the system capacity and conversion efficiency but also generate zero-sequence circulating current, which will distort the AC-side current and increase power losses.
Zhao Han, Xiaoli Wang, Baochen Jiang, Jingru Chen   +3 more
doaj   +2 more sources

Frequency Response Testing of Zero-Sequence Current Transformers for Mining Ground Fault Protection Relays [PDF]

International Journal of Electronics and Telecommunications, 2020
In Polish coal mining, medium voltage power distribution networks operate with an insulated neutral point. Zero-sequence current transformers are the basic sensors that generate input signals for earth-fault protection relays.
Krzysztof Kuliński, Adam Heyduk
doaj   +2 more sources

Research on zero-sequence circulating current of bidirectional converters

机车电传动
The bidirectional converter device, featuring multiple converters in parallel on both AC and DC sides, employs carrier phase-shifting control. This approach can significantly enhance system capacity and reduce grid current harmonics; however, it also ...
YANG Jun, SONG Qianru, CHEN Guangzan, CHENG Zhenglin, WANG Xiong, YI Yunlan   +5 more
doaj   +2 more sources

Zero‐Sequence current measurement uncertainty in three‐phase power systems during normal operation [PDF]

IET Generation, Transmission & Distribution, 2021
Zero‐sequence currents in high‐voltage power systems during normal operation can have a significant influence on nearby infrastructure. It is therefore necessary to gain insight into typical levels of zero‐sequence currents in a variety of operational ...
Sjoerd Nauta, Ramiro Serra
doaj   +2 more sources

A fault line selection method for flexible grounding systems based on zero-sequence current phase variation

Zhejiang dianli
To address the poor tolerance to transitional resistance and incomplete utilization of fault information in grounding protection for flexible grounding systems， a fault line selection method based on current phase variation is proposed.
LI Zong, WANG Deqiang, FENG Liang, SONG Jianguo, GAO Weiyuan, YUAN Pengsheng   +5 more
doaj   +2 more sources

Empirical substantiation of the advantage of using the modified method of symmetrical components to estimate the value of zero-sequence current in distribution grids

Вестник Северо-Кавказского федерального университета
Introduction. The tendency of growth in the number and increase in the installed capacity of single-phase nonlinear electric consumers leads to the deterioration of power quality.
A. A. Pesterev, S. S. Kostinskiy, N. D. Narakidze   +2 more
doaj   +3 more sources

Research of Zero Sequence Current of Parallel System of PWM Rectifier

Gong-kuang zidonghua, 2012
Taking two-level parallel system of PWM rectifier as example, the paper analyzed cause of zero sequence circulation in parallel module: the circulation is generated by difference of duty cycle of zero sequence current of two modules; generation of the ...
NI Shuai, TANG Li-na, LIU Jie, NI Shi-jiang   +3 more
doaj   +1 more source