Journal ArticleDOI
Fundamental Basis for Distance Relaying on 3-Phase Systems
W. A. Lewis,L. S. Tippett +1 more
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TLDR
In this paper, it has been shown that the quantities obtained by the use of earlier distance relay connections for both line and ground faults do not give the closest approach to the desired result, a constant indication for all types of faults at a given location.Abstract:
In the preceding investigation the quantities upon which distance relays must depend for their operation have been determined for all possible types of faults occurring at a single location. It has been shown that the quantities obtained by the use of earlier distance relay connections for both line and ground faults do not give the closest approach to the desired result, a constant indication for all types of faults at a given location. It has been shown further that, by the use of different connections and certain auxiliary apparatus, a constant relaying indication may be obtained by the line relays for all types of line faults and by the ground relays for all types of faults involving ground, if the fault resistance is zero, and, if the fault resistance is not zero, that smaller deviations from the normal value will be obtained for a given fault resistance. The analysis has been based upon the assumptions of sine wave currents and voltages, constant circuit impedances, and negligible distributed capacitance in the faulted sections of line. It has been assumed further that the fault impedance is resistance only and that it is effectively constant throughout each cycle. All of these assumptions, except perhaps the latter, are reasonably valid as far as relaying is concerned, although some consideration must be given to the d-c component of the short-circuit currents with very high-speed relays.read more
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Power System Relaying
TL;DR: In this paper, the authors present a classic power system relaying and power system phenomena including stability protection, reliability, and reliability of the relaying system from a network operator's perspective.
Journal ArticleDOI
Fuzzy ART neural network algorithm for classifying the power system faults
S. Vasilic,Mladen Kezunovic +1 more
TL;DR: Simulation results show improved algorithm recognition capabilities when compared to a previous version of ART algorithm for each of the implemented scenarios.
Adaptive distance protection of a double-circuit line using artificial neural nets
A.G. Jongepier,L. van der Sluis +1 more
TL;DR: In this paper, a strategy for the implementation of artificial neural nets (ANN) in an automated substation keeping the settings of all distance relays in the substation appropriate is presented.
Journal ArticleDOI
Adaptive distance protection of a double-circuit line
A.G. Jongepier,L. van der Sluis +1 more
TL;DR: In this paper, the distance protection of a double-circuit line under the single-line-to-ground fault (SLG) condition is formulated, and a correction factor is introduced, set adaptively according to the actual power system state.
Journal ArticleDOI
A digital computer system for EHV substations: Analysis and field tests
TL;DR: In this paper, the authors describe the research and development work being done at the AEP Service Corp. on digital computer applications in EHV substations, including relaying of transmission lines and other power system equipment, station alarm monitoring and data logging, oscillography, and supervisory control functions.
References
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Journal ArticleDOI
Method of Symmetrical Co-Ordinates Applied to the Solution of Polyphase Networks
TL;DR: In this article, a general discussion of unsymmetrical systems of co-planar vectors leads to the conclusion that they may be represented by symmetric systems of the same number of vectors, the number of symmetrical systems required to define the given system being equal to its degrees of freedom.
Journal ArticleDOI
Impedances Seen by Relays During Power Swings With and Without Faults
TL;DR: The authors are at present in a period of power-system development during which it is essential that the best use be made of manpower and materials, and equipment must be re-evaluated and refinements made in the design of apparatus and methods of system control.
Journal ArticleDOI
Studies of Transmission Stability
R. D. Evans,C. F. Wagner +1 more
TL;DR: In this article, the authors defined the capacity of a power system to remain in equilibrium under steady load conditions, and its ability to regain a state of equilibrium after a disturbance has taken place.
Journal ArticleDOI
Protective Relaying for Long Transmission Lines
TL;DR: In this paper, the authors proposed the concept of the input impedance, which is the magnitude of the impedance or reactance of the line as it appears to the relay, and determined by the current and voltage existing at the relay location.
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