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Protection coordination of directional overcurrent relays considering fault current direction
IEEE PES Innovative Smart Grid Technologies, Europe, 2014Directional inverse time overcurrent relays are used in protection systems of meshed networks to operate for fault currents in its forward zone of operation. They are used for primary and backup protection and their operation needs to be coordinated to assure selectivity.
Hebatallah Mohamed Sharaf +3 more
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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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Coordination of Directional Overcurrent Relay Using PSO-DE Algorithm
2021 International Conference on Technology and Policy in Energy and Electric Power (ICT-PEP), 2021A power system network has dynamic and complex characteristics. The continuity of electricity supply to customer side from the generation in stable, secure, and reliable is being a top priority to be considered. Preserving an operation of a power system on its operating point depends on its protection system scheme.
Handy Agung Tresnadi +3 more
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Smart distribution protection using current-only directional overcurrent relay
2010 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe), 2010Overcurrent relays are widely used for power systems protection. Transmission side uses more directional type relays, while distribution systems, e.g., radial and ring-main subtransmission systems use non-directional types. The fault direction may be forward (between relay and grid), or reverse (between relay and source), the normal power flow being ...
Abhisek Ukil +2 more
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The Local Fit Method for Coordinating Directional Overcurrent Relays
IEEE Transactions on Power Delivery, 2016The problem of coordinating directional overcurrent relays in transmission and subtransmission systems requires an exhaustive analysis and treatment of a large amount of information. Existing methods face some drawbacks, such as the combinatorial explosion due to the large number of relays and possibilities of settings, the need to adjust inner ...
Danilo L. A. Negrao, Jose C. M. Vieira
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Optimal coordination of microprocessor based directional overcurrent relays
2008 Canadian Conference on Electrical and Computer Engineering, 2008The paper presents a new problem formulation for coordinating microprocessor based directional overcurrent relays in an interconnected power system. Unlike previous formulations, the proposed problem formulation takes into account the discrete nature of pickup current settings and the available time-current characteristics of the relay.
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Directional Overcurrent Relay Coordination Using Hybrid BBO-PSO Technique
2020Directional Overcurrent Relays (DOCRs) coordination problem is expressed as a nonlinear optimization problem with many constraints. The aim of this optimization problem is to minimize total operating time of primary relays, which depends upon independent variables: plug setting (PS) and time multiplier setting (TMS).
Romio Atha +2 more
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Directional overcurrent relay coordination considering non-standardized time curves
Electric Power Systems Research, 2015Abstract In this work, a directional overcurrent relay coordination is carried out considering more than one level of short-circuit current and non-standardized inverse time curves. A genetic algorithm is proposed and shown capable of obtaining adequate protection settings in a reasonable time.
Carlos A. Castillo Salazar +2 more
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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.
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Coordination of directional overcurrent relay timing using linear programming
IEEE Transactions on Power Delivery, 1996A successive linear programming methodology is presented to treat more effectively those applications where a local structure change is performed to a power system already in operation, and where the modification of the settings of already existent relays is not desirable. The dimension of the optimization problems to be solved is substantially reduced,
A.J. Urdaneta +3 more
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