Results 151 to 160 of about 1,625 (202)

INTEGRATED SOFTWARE FOR OPTIMAL DIRECTIONAL OVERCURRENT RELAY COORDINATION

Electric Machines & Power Systems, 1994
ABSTRACT 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

Hybrid optimization algorithm for directional overcurrent relay coordination

2014 IEEE PES General Meeting | Conference & Exposition, 2014
This 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, Mario Oleskovicz, Denis V. Coury, Silvio A. de Souza, Meronides J. Ramos   +4 more
openaire   +1 more source

Protection coordination of directional overcurrent relays considering fault current direction

IEEE PES Innovative Smart Grid Technologies, Europe, 2014
Directional 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, H. H. Zeineldin, Doaa Khalil Ibrahim, Essam El Din Abo El Zahab   +3 more
openaire   +1 more source

Optimal coordination of directional overcurrent relays considering definite time backup relaying

IEEE Transactions on Power Delivery, 1999
A 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

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

Directional Overcurrent Relays Coordination Scheme for Protection of Microgrid

2020 IEEE First International Conference on Smart Technologies for Power, Energy and Control (STPEC), 2020
The 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
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

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

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 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.
openaire   +1 more source