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Symmetrical-component impedance notation
Electrical Engineering, 1938No entirely adequate and consistent notation for impedances in symmetrical components has been presented in the books on symmetrical components nor has such a notation come into general use. In particular, the symbols Z 0 , Z 1 , Z 2 have been used with two entirely different meanings (as described in this letter) which cannot but lead to confusion. I
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Teaching fault studies using symmetrical components
IEEE Transactions on Power Systems, 1990Symmetrical component methods are reviewed for calculating currents in three-phase electrical power systems following asymmetrical faults. Solution of the load flow problem in evaluating component currents and voltages in network elements is also discussed.
T.J. Hammons, A.S. Stevenson
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Improved protection systems using symmetrical components
2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294), 2002This paper presents an analysis that demonstrates how symmetrical components can improve protection system performance. A sensitivity analysis showing how phase and symmetrical component currents develop during faults is presented. Application of negative-sequence overcurrent elements for improved protection is described.
L.A. Kojovic, J.F. Witte
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Concept and Definition of Dynamic Symmetrical Components With Time-Varying Amplitude and Frequency
IEEE transactions on energy conversion, 2022Yingbiao Li +5 more
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A symmetrical component synthesizer and analyzer
Electrical Engineering, 1954The basic formulas of the method of symmetrical components may be verified and the elliptical pattern produced by unbalanced currents can be analyzed to determine directly from the dimensions of the ellipse the magnitudes of the positive and negative sequence components by means of the polyphase oscilloscope developed at the State University of Iowa.
E. B. Kurtz, C. R. Lodge
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Lightweight Involutive Components for Symmetric Cryptography
2019 16th International ISC (Iranian Society of Cryptology) Conference on Information Security and Cryptology (ISCISC), 2019Lightweight components are used in the design of modern lightweight ciphers. In the current paper, firstly we investigate a new family of lightweight $4\times 4$ almost MDS diffusion layers, mathematically, and determine when they are involutive. The proposed diffusion layers are suitable for software applications and have less fixed points, compared
S. M. Dehnavi +2 more
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Directional Relay Based on Time-Domain Symmetrical Components With Incremental Quantities
IEEE transactions on industry applications, 2021Julio RodrÃguez Carvajal +2 more
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Simple computations involving two-component symmetric trilayers
Applied Optics, 2002The equivalent properties of a symmetric three-layer structure are derived by a nontraditional method that provides useful insights and a simplified application to some thin-film design problems. The equations derived from this method may be used to design a three-layer replacement for a single layer in an interference coating.
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Transient Analysis of Symmetrical Networks by the Method of Symmetrical Components
Transactions of the American Institute of Electrical Engineers, 1940The canonical equations of a general, linear, bilateral symmetrical network of n meshes on which are impressed arbitrary mesh voltages are subjected to a Laplacian transformation. The transformed equations are then subjected to a symmetrical component transformation.
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Power quality and symmetrical component analysis
Conference Record of 1993 Annual Pulp and Paper Industry Technical Conference, 2002Power quality problems can result from unbalances in either the system load or the system components. These unbalances can result in overheating of system components, difficulty in controlling equipment, and circulating currents in the delta winding circuits of machines.
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