Results 121 to 130 of about 224 (167)
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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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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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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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Optimal coordination of directional overcurrent relay coordination
IEEE Power Engineering Society General Meeting, 2005, 2005Directional overcurrent relays are used to protect interconnected power systems and looped distribution systems. Several techniques and formulations have been proposed to solve the directional overcurrent relay problem. In this paper, the proposed formulations for relay coordination problem are discussed.
H. Zeineldin +2 more
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Optimization of directional overcurrent relay times by particle swarm optimization
2008 IEEE Swarm Intelligence Symposium, 2008An important problem in electrical engineering is to determine the optimal directional overcurrent relay times. The problem is modeled as a constrained nonlinear optimization problem in which the decision variables are the devices that control the act of isolation of faulty lines from the system without disturbing the healthy lines.
Jagdish Chand Bansal, Kusum Deep
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Directional Overcurrent Relays Coordination Scheme for Protection of Microgrid
2020 IEEE First International Conference on Smart Technologies for Power, Energy and Control (STPEC), 2020The changes in operating states of microgrid cause significant variations in fault currents that may affect the coordination of directional over current relays (DOCRs). In this paper, an adaptive protection scheme is proposed for coordination of DOCRs in microgrids having two connection points with external grid.
P Naveen, Premalata Jena
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Planning the coordination of directional overcurrent relays for distribution systems considering DG
2016 IEEE Power and Energy Society General Meeting (PESGM), 2016Introduction of distributed generation (DG) to the power system may lead to nonselective protection actions. For every future DG installation, the relay settings need to be modified to guarantee protection coordination that can lead to numerous changes in relay settings.
Lukasz Huchel, Hatem H. Zeineldin
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PBILApplied to Optimal Directional Overcurrent Relay Coordination:Effect of Learning Rate
2019 IEEE Symposium Series on Computational Intelligence (SSCI), 2019Conventional relay coordination philosophy does not take into consideration all the system conditions and configurations in the fault analysis. Therefore, relay settings should be reviewed whenever there is a significant change in system conditions to ensure that they are still valid.
Ndabeni M. Stenane, Komla A. Folly
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Directional overcurrent relays
2011Directional 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.
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Hybrid optimization algorithm for directional overcurrent relay coordination
2014 IEEE PES General Meeting | Conference & Exposition, 2014This work presents a method for directional overcurrent relay (DOR) coordination in a meshed power system by optimizing its operating time. The meshed power system is part of a Brazilian power transmission system, which has been evaluated via CAPE (Computer-Aided Protection Engineering) software for short circuit studies.
Fernando B. Bottura +4 more
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