Results 231 to 240 of about 231,657 (285)
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Performance of distance relays
Electrical Engineering, 1936The effect of grounded neutral ?/Y or Y/? power transformers upon the performance of certain impedance and reactance relays is set forth in this paper, and formulas are developed for use in predetermining the performance of these relays under operating conditions.
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Numerical conic distance relay
2015 International Conference on Innovations in Information, Embedded and Communication Systems (ICIIECS), 2015Relays are the key device that is used for the protection of a power transmission system. The paper presents the development of a numerical distance relay, based on conic characteristics. The developed distance relay is intended for the protection of transmission network so that the scheme would exclude most of the conditions for which tripping is ...
David G Philip, Arun Rajendran
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An Adaptive Distance Relay and Its Performance Comparison with a Fixed Data Window Distance Relay
IEEE Power Engineering Review, 2002This paper describes the design, implementation and testing of an adaptive distance relay. The relay uses a fault detector to determine the inception of a fault and then uses data windows of appropriate length for estimating phasors and seen impedances. Hardware and software of the proposed adaptive relay are also described in this paper. The relay was
T.S. Sidhu, D.S. Ghotra, M.S. Sachdev
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Intelligent coordinated adaptive distance relaying
Electric Power Systems Research, 2014Abstract Malfunctioning of distance relay third zone has been identified as one of the leading factors of power system blackouts in several nations. This inconsistency in operation happens when heavy loads start encroaching the zone 3 settings. In this paper, a novel multi-agent system based methodology for power system protection coordination is ...
Mohammed A. Haj-ahmed +1 more
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Proceedings in distance relaying
6th International Conference on Developments in Power Systems Protection, 1997Detailed reports on power system fault histories are now available, leading to a new quality of fault analysis. The sequence of events and the reactions of the power system protection relay during network disturbances become transparent and reproducible.
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Transactions of the American Institute of Electrical Engineers, 1948
DISTANCE-TYPE relays have been used successfully for many years to protect against phase faults on transmission lines. However, distance relays to protect against ground faults in the same satisfactory manner as for phase faults have not been generally available.
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DISTANCE-TYPE relays have been used successfully for many years to protect against phase faults on transmission lines. However, distance relays to protect against ground faults in the same satisfactory manner as for phase faults have not been generally available.
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2013
Contactless smart cards are used to securely store data and to authorize the execution of sensitive operations. Their contactless interface represents a mixed blessing, allowing fast operations but also such devices to potential attacks. Relay attacks are among the most powerful attacks applicable against contactless smart cards, allowing a contactless
Luigi Sportiello, Andrea Ciardulli
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Contactless smart cards are used to securely store data and to authorize the execution of sensitive operations. Their contactless interface represents a mixed blessing, allowing fast operations but also such devices to potential attacks. Relay attacks are among the most powerful attacks applicable against contactless smart cards, allowing a contactless
Luigi Sportiello, Andrea Ciardulli
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Automation of Distance Relay Testing
2019 20th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM), 2019The article addresses the issues of obtaining a mathematical description of electrical parameters characterizing the out-of-step operation of a power system which is necessary for testing relay protection and emergency control automatic equipment based on distance principle of operation.
Vladimir E. Glazyrin +3 more
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Static sampling distance relays
Proceedings of the Institution of Electrical Engineers, 1968A sampling technique has been developed which allows a comparison of instantaneous values derived at different instants of time, thereby dispensing with the need to phase-shift or mix signals derived from the primary line quantities. Both amplitude and phase comparisons are used to derive a variety of impedance characteristics.
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A Static Polyphase Distance Relay
IEEE Transactions on Power Apparatus and Systems, 1972The paper describes a Static Polyphase distance relaying scheme responding correctly to all Single line-to-ground faults and all doible-phase faults, with or without ground, by the phase-comparison of line-to-neutral compensated fault point voltages. It has been shown that if any two, out of the three, phase voltages at the fault point derived at the ...
D. Bhattacharya +3 more
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