Results 281 to 290 of about 12,015,384 (327)

Negative-Sequence Current Injection of Transmission Solar Farms

IEEE Transactions on Power Delivery, 2020
Integrating solar generation brings about unique challenges in power system protection. Previous studies have found inverter-based resources featuring distinct fault responses compared to conventional generators.
Gefei Kou, J. Jordan, Brett Cockerham, R. Patterson, Philip VanSant   +4 more
semanticscholar   +1 more source

An earth fault location method based on negative sequence voltage changes at low voltage side of distribution transformers

International Journal of Electrical Power & Energy Systems, 2020
The paper presents a new approach for earth fault localization which is based on evaluation of phase to ground voltages recorded by voltage monitors installed at low-voltage side of distribution transformer station deployed under smart metering projects.
D. Topolanek, M. Lehtonen, P. Toman, J. Orságová, J. Drapela   +4 more
semanticscholar   +1 more source

Negative sequence control of DFG based wind turbines

2011 IEEE Power and Energy Society General Meeting, 2011
The paper deals with the control of negative sequence voltages and currents in wind turbine systems caused by grid fault or unsymmetrical system operation. The ensuing stator and rotor currents lead to additional thermal stress. Moreover, the interaction between the different sequence components of the current and voltage in the stator as well as rotor
S. Engelhardt, J. Kretschmann, J. Fortmann, F. Shewarega, I. Erlich, C. Feltes   +5 more
openaire   +2 more sources

Negative-Sequence Network Based Fault Location Scheme for Double-Circuit Multi-Terminal Transmission Lines

IEEE Transactions on Power Delivery, 2019
The fault resistance and infeeded currents from tapped transmission lines are the two main challenges to establish correct fault location estimation in multi-terminal transmission lines.
A. Ghorbani, H. Mehrjerdi
semanticscholar   +1 more source

Fault location in UPFC compensated double circuit transmission line using negative sequence current phasors

, 2020
Double-circuit transmission lines are used in modern power systems to enhance the transmission capability and to improve system reliability and safety. However, the protection of double-circuit lines is a challenging task as the presence of flexible ac ...
Madhumita Kundu, S. Debnath
semanticscholar   +1 more source

Negative-sequence reactance of synchronous machines

Electrical Engineering, 1936
A theoretical analysis of the method proposed by the AIEE committee on electrical machinery for measuring the negative-sequence reactance of synchronous machines is presented in this paper. The analysis proves that the method leads to a correct measurement of the negative-sequence reactance for the operating condition most frequently met in applying ...
openaire   +1 more source

Polynucleotide Sequence Divergence Among Some Coagulase-negative Staphylococci

Zentralblatt für Bakteriologie. 1. Abt. Originale A, Medizinische Mikrobiologie, Infektionskrankheiten und Parasitologie, 1980
The degree of binding was determined, at both exacting and non-exacting temperatures, between deoxyribonucleic acid (DNA) preparations from coagulase-negative staphylococci and carbon (14C) labelled DNA from nine reference strains, Staphylococcus capitis LK499, S. cohnii GH137, S. epidermidis GH37, S. haemolyticus SM131, S.
M, Goodfellow, M, Mordarski, A, Tkacz, K, Szyba, G, Pulverer   +4 more
openaire   +2 more sources

Cluster Voltage Regulation Strategy to Eliminate Negative-Sequence Currents Under Unbalanced Grid for Star-Connected Cascaded H-Bridge STATCOM

IEEE transactions on power electronics, 2019
Under unbalanced grid, three cluster voltages are typically controlled balanced and unchanged for the star-connected cascaded H-bridge static synchronous compensator (CHB STATCOM), however, to deal with the unbalanced grid voltages, the modulation ...
Daorong Lu, Sen Wang, Jianhui Yao, Tianyu Yang, Haibing Hu   +4 more
semanticscholar   +1 more source

Sequencing of oligodeoxyribonucleotides by negative FAB - MS

International Journal of Mass Spectrometry and Ion Physics, 1983
Abstract Negative fast atom bombardment mass spectrometry (FAB-MS) (ref. 1) is a powerful tool for sequencing oligodeoxyribonucleotides. The negative ion fragmentation pattern allows a bidirectional sequence analysis (ref. 2).
L. Grotjahn, R. Frank, H. Blöcker
openaire   +1 more source

A novel modeling approach of negative-sequence current for electrified railway traction substation

International Journal of Electrical Power & Energy Systems, 2019
To analyze the negative effects caused by unbalanced traction loads, the key is to build an efficient load model. This paper proposes a probabilistic traction load model in both generalized and simplified forms, where two decisive factors, number of ...
Shaobing Yang, Xue Li, Kejian Song, Mingli Wu   +3 more
semanticscholar   +1 more source