Results 171 to 180 of about 2,378 (215)

Smart distribution protection using current-only directional overcurrent relay

2010 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe), 2010
Overcurrent 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, Bernhard Deck, Vishal H Shah   +2 more
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The Local Fit Method for Coordinating Directional Overcurrent Relays

IEEE Transactions on Power Delivery, 2016
The 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
openaire   +1 more source

Optimal coordination of microprocessor based directional overcurrent relays

2008 Canadian Conference on Electrical and Computer Engineering, 2008
The 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

2020
Directional 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, Tapan Santra, Animesh Karmakar   +2 more
openaire   +1 more source

Directional overcurrent relay coordination considering non-standardized time curves

Electric Power Systems Research, 2015
Abstract 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, Arturo Conde Enríquez, Satu Elisa Schaeffer   +2 more
openaire   +1 more source

Coordination of Directional Overcurrent Relays Using Seeker Algorithm

IEEE Transactions on Power Delivery, 2012
Coordination 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.
openaire   +1 more source

Coordination of directional overcurrent relay timing using linear programming

IEEE Transactions on Power Delivery, 1996
A 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, H. Restrepo, S. Marquez, J. Sanchez   +3 more
openaire   +1 more source

Optimal coordination of directional overcurrent relays

2018
The coordination between DOCRs is nonlinear and highly constrained optimization problem in which two settings, namely, TDS and PCS of each relay are considered as decision variables. The main objective is to minimize the sum of OTs of all the primary relays, which are expected to operate in order to clear the faults of their corresponding zones.
openaire   +1 more source

Developing Directional Overcurrent Relay Without Voltage Input

With the rapidly increasing population and industrialization, the demand for electrical energy is constantly rising. This situation makes it inevitable to adopt new and innovative approaches in the production and distribution of electrical energy. In order to reduce dependence on traditional fossil fuel sources and minimize environmental impacts, there
ŞENYÜZ, Semih, BAYSAL, Mustafa, EVKAY, İbrahim   +2 more
openaire   +1 more source

Optimized setting of directional overcurrent relays via genetic algorithm

2018 Simposio Brasileiro de Sistemas Eletricos (SBSE), 2018
The coordination of overcurrent relays in transmission systems plays an important role in ensuring a safe and reliable energy supply. This type of coordination requires a complex protection engineering study, thus demanding a great deal of time and non-optimized parameters, mainly in large-scale systems.
Luis A. P. Souza, Carlos L. B. Silva, Wesley P. Calixto   +2 more
openaire   +1 more source