Results 231 to 240 of about 6,985 (272)

Current-Only Directional Overcurrent Relay

IEEE Sensors Journal, 2011
Overcurrent relays are widely used for protection of power systems, directional ones for transmission side, and nondirectional ones for distribution side. The fault direction may be forward (between relay and grid), or reverse (between relay and source), the normal power flow being from source to the grid. Known directional overcurrent relays rely on a
Abhisek Ukil, Bernhard Deck, Vishal H. Shah   +2 more
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Time-Overcurrent Relay Coordination: A Review

International Journal of Emerging Electric Power Systems, 2005
When two protective apparatus installed in series have characteristics, which provide a specified operating sequence, they are said to be coordinated or selective. The coordination of directional overcurrent relays poses serious problems in the modern complex power system networks, which are interconnected.
Dinesh Birla, Rudra Prakash Maheshwari, Hari Om Gupta   +2 more
openaire   +1 more source

Directional overcurrent relays

2011
Directional overcurrent protection is used when it is necessary to protect the system against fault currents that could circulate in both directions through a system element, and when bidirectional overcurrent protection could produce unnecessary disconnection of circuits.
openaire   +1 more source

Testing dynamic characteristics of overcurrent relays

IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings, 2002
Test methods for determining the dynamic characteristics of an overcurrent relay are discussed. By dynamics is meant the response of the relay to a current of varying magnitude. The test method, originated by IREQ, is used by Hydro Quebec to determine the ability of new relays to coordinate with the installed base of induction relays.
G. Benmouyal, S.E. Zocholl
openaire   +1 more source

ANN based directional overcurrent relay

2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294), 2002
This paper describes the design and development of an ANN based novel directional overcurrent relay. A multi-layer feedforward neural network (FFNN) trained with the error backpropagation algorithm has been developed to realize this relay. The ANN based algorithm is off line tested using different simulation equations for overcurrent and voltage under ...
D.N. Vishwakarma, Z. Moravej
openaire   +1 more source

Overcurrent relay coordination by evolutionary programming

Electric Power Systems Research, 2000
Abstract This paper presents a novel optimization technique based on evolutionary programming for overcurrent (OC) relay coordination in ring fed distribution networks. Since the problem has multi-optimum points, ordinary mathematical based optimization techniques will fail.
C.W. So, K.K. Li
openaire   +1 more source

Microcomputer-based multiple overcurrent relays

Computers in Industry, 1993
Abstract This paper presents an application of the most recent modern technology to implement overcurrent relaying functions in a power system. A microprocessor-based single and multiple overcurrent relays have been reported. In this work it is shown that a microcomputer in conjunction with an interface board can be economically used to develop a ...
Faisal Fadul, Monir Ahmad
openaire   +1 more source

A new one-cycle directional overcurrent relay

Electrical Engineering, 1943
This paper describes a new one-cycle directional overcurrent relay which is not limited in its application by lack of contact co-ordination. That contact coordination is important is indicated by the many incorrect relay operations which have been traced to the common practice of adding instantaneous attachment to directional overcurrent relays.
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Design of a microprocessor-based overcurrent relay

[Proceedings] WESCANEX '91, 2002
The authors describe the design of a microprocessor-based overcurrent relay that is suitable for protecting distribution and subtransmission networks. A modified technique for modeling the time-current characteristics is described. The proposed design is implemented using a Texas Instruments TMS320C25 digital signal processor.
T.S. Sidhu, M.S. Sachdev, H.C. Wood
openaire   +1 more source

Overcurrent relays coordination for commercial building

2013 IEEE 7th International Power Engineering and Optimization Conference (PEOCO), 2013
This paper presents an overcurrent relays coordination study for an 11 kV commercial building in southern Malaysia. Nevertheless, the actual study that covers the overcurrent relays, earth fault relays and earth leakage relays were executed by providing optimum and functionable relay settings prior to commissioning of the building.
O. Aliman, I. Musirin
openaire   +1 more source