Results 151 to 160 of about 235,466 (206)
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Electric Power Systems Research, 1996
Abstract This paper presents the design and construction of overcurrent and directional overcurrent relays with ground fault protection for the protection of three-phase subtransmission and distribution systems, using a 16-bit microprocessor, the Intel 8096BH. The relay obtains the system currents at the rate of 12 samples per cycle and estimates the
Zhijun, G., Elangovan, S., Liew, A.C.
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Abstract This paper presents the design and construction of overcurrent and directional overcurrent relays with ground fault protection for the protection of three-phase subtransmission and distribution systems, using a 16-bit microprocessor, the Intel 8096BH. The relay obtains the system currents at the rate of 12 samples per cycle and estimates the
Zhijun, G., Elangovan, S., Liew, A.C.
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Current-Only Directional Overcurrent Relay
IEEE Sensors Journal, 2011Overcurrent 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 +2 more
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Optimal coordination of directional overcurrent relays considering definite time backup relaying
IEEE Transactions on Power Delivery, 1999A methodology is presented for the consideration of definite-time backup relays in the optimal coordination of directional overcurrent relays using linear programming. It is shown that the influence of considering second-zone distance relays and breaker failure relays impose important requirements for the determination of the time dial settings of ...
L.G. Perez, A.J. Urdaneta
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Coordination of Directional Overcurrent Relays Using Seeker Algorithm
IEEE Transactions on Power Delivery, 2012Coordination of directional overcurrent relays in a multiloop subtransmission or distribution network is formulated as an optimization problem. In this paper, the coordination of directional overcurrent relays is formulated as a mixed-integer nonlinear programming problem and is then solved by a new seeker optimization technique.
Turaj Amraee
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Directional Overcurrent Relaying (67) Concepts
2006 IEEE Rural Electric Power Conference, 2006Directional overcurrent relaying (67) refers to relaying that can use the phase relationship of voltage and current to determine direction to a fault. There are a variety of concepts by which this task is done. This paper reviews the mainstream methods by which 67 type directional decisions are made by protective relays.
J. Horak, W. Babic
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Correlation functions based directional overcurrent relay
2012 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2012This paper describes a new directional overcurrent relay for protection of interconnected distribution network and DG unit. When the relay current exceeds its pick-up value, correlation of the voltage and current at the relay point as well as partial autocorrelation of the current are calculated.
Ebrahim Farjah +2 more
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Adaptive Settings of Directional Overcurrent Relay
2020 International Conference on Electrical Engineering (ICEE), 2020Power distribution system condition changes dynamically due to presence of distributed energy resources (DERs). This can cause failure of protection system of meshed system. To cope with changing system condition, settings of numerical directional overcurrent relays should be changed accordingly.
Piyusha Ramesh Lidhade, Anil. P. Vaidya
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ANN based directional overcurrent relay
2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294), 2002This 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
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A new one-cycle directional overcurrent relay
Electrical Engineering, 1943This 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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Designing of Numerical Directional Overcurrent Relay
2018 International Conference on Smart Electric Drives and Power System (ICSEDPS), 2018This paper gives an insight into designing of numerical directional over-current relay for distribution system using real time signals. For fault detection differential sampling method is used. Real time signals are converted in discrete form using an advanced analog to digital conversion device Advantech USB 4711/A.
Rupal Agarwal +2 more
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