Results 131 to 140 of about 224 (167)
Some of the next articles are maybe not open access.
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
openaire +1 more source
The evolutionary algorithm EPSO to coordinate directional overcurrent relays
10th IET International Conference on Developments in Power System Protection (DPSP 2010). Managing the Change, 2010The goal of this paper is to coordinate directional overcurrent relays using the Evolutionary Particle Swarm Optimization (EPSO) Algorithm. EPSO Algorithm has gained a lot of interest for its simplicity, robustness and easy implementation. Coordinate directional overcurrent relays on a meshed network deals with a large volume of data, with many ...
H. Leite, J. Barros, V. Miranda
openaire +1 more source
Design and implementation of a versatile digital directional overcurrent relay
Electric Power Systems Research, 1990Abstract This paper presents the design and implementation of a versatile digital directional overcurrent relay. The problem of approximating the time-current characteristic curves of an overcurrent relay is addressed. These curves are approximated by piecewise quadratic polynominals whose coefficients are calculated using a weighted least-squares ...
Yalla V.V.S. Murty, W.J. Smolinski
openaire +1 more source
INTEGRATED SOFTWARE FOR OPTIMAL DIRECTIONAL OVERCURRENT RELAY COORDINATION
Electric Machines & Power Systems, 1994ABSTRACT This paper reports the development of fully integrated software for the optimal directional overcurrent relay coordination of interconnected power systems. Different software packages like load flow analysis, fault analysis, determination of backup/primary relay pairs, main relay coordination program, etc. have been integrated.
NASEER A. LAWAY, H. O. GUPTA
openaire +1 more source
A novel problem formulation for directional overcurrent relay coordination
2004 Large Engineering Systems Conference on Power Engineering (IEEE Cat. No.04EX819), 2004In general, directional overcurrent relays allow for continuous time dial settings but discrete pickup current settings. All previous work formulates the coordination problem either as a linear programming problem or as a nonlinear programming problem.
H. Zeienldin +2 more
openaire +1 more source
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.
openaire +1 more source
Optimal Directional Overcurrent Relays Coordination using Directional Bat Algorithm
2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America), 2019Coordination of directional overcurrent relays is most often made based on manual procedures. However, due to its complexity and time-consuming, these procedures have been formulated as an optimization problem. The aim of this paper is to present a directional Bat Algorithm (dBA) as a potential algorithm for optimal coordination of directional ...
Felipe C. Sampaio +5 more
openaire +1 more source
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
openaire +1 more source
Optimal coordination of directional overcurrent relays
2018The 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
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
openaire +1 more source