Results 181 to 190 of about 2,378 (215)

A novel problem formulation for directional overcurrent relay coordination

2004 Large Engineering Systems Conference on Power Engineering (IEEE Cat. No.04EX819), 2004
In 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, E.F. El-Saadany, M.A. Salama   +2 more
openaire   +1 more source

Optimal coordination of directional overcurrent relays using NSGA-II

Electric Power Systems Research, 2015
Abstract This paper presents a new method for coordination of directional overcurrent relays to reduce the discrimination time of the primary and backup relays, by using nondominated sorting genetic algorithm-II (NSGA-II). In order to achieve a reliable protective system, it is necessary to find a solution to avoid having large discrimination times ...
Zahra Moravej, Farhad Adelnia, Fazel Abbasi   +2 more
openaire   +1 more source

Adaptive Protection Coordination Scheme Using Numerical Directional Overcurrent Relays

IEEE Transactions on Industrial Informatics, 2019
Dynamically changing distribution system operating conditions compromises the coordination of the existing protection schemes. This paper proposes an online adaptive protection coordination scheme by utilizing numerical directional overcurrent relays (DOCRs) and commercial A Mathematical Programming Language (AMPL) based Interior Point OPTimization ...
openaire   +1 more source

Coordination of directional overcurrent relays using artificial bee colony

22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013), 2013
This paper proposes to solve the coordination of directional overcurrent relays problem (DOCK) using Artificial Bee Colony optimization (ABC) which is robust and easily implemented. Three case studies were evaluated and implemented on looped 3-bus, 6-bus, and 8-bus systems. The obtained results from the proposed ABC algorithm is compared to those using
M. El-Mesallamy, W. El-Khattam, H. Talaat, A. Hassan   +3 more
openaire   +1 more source

Optimization of Directional Overcurrent Relay Times Using C-SOMGA

2016
An 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.
Kusum Deep, Dipti Singh
openaire   +1 more source

Directional overcurrent relay coordination optimization

2023
Meng Yen Shih, Arturo Conde, Jorge Chan González, Francisco Lezama Zárraga   +3 more
openaire   +1 more source

Modeling Directional Overcurrent Relays using Modelica

2023 IEEE 3rd International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering (MI-STA), 2023
Montaser. A. Qasem, Ali Dhaw Aljadi, Ezzedin Muftah Enbiah   +2 more
openaire   +1 more source

Directional overcurrent relays

2021
openaire   +1 more source

Alloying of Cu with Ru Enabling the Relay Catalysis for Reduction of Nitrate to Ammonia

Advanced Materials, 2023
Wensheng Gao, Can Li
exaly  

Ultralow overpotential nitrate reduction to ammonia via a three-step relay mechanism

Nature Catalysis, 2023
Shu-He Han, Hongjiao Li, Tieliang Li
exaly