Results 71 to 80 of about 340 (134)

Optimization Techniques for Directional Overcurrent Relay Coordination: A Comprehensive Review

IEEE Access
This paper provides a comprehensive review of optimization techniques for coordinating directional overcurrent relays in power systems. It covers a wide range of techniques, including conventional and deterministic methods, metaheuristic algorithms, and ...
Tareq Foqha, Samer Alsadi, Osama Omari, Shady S. Refaat   +3 more
doaj   +1 more source

Optimal adaptive coordination of overcurrent relays in power systems protection using a new hybrid metaheuristic algorithm

IET Renewable Power Generation
Advent of distributed generation and progression towards an intelligent grid infrastructure within the domain of contemporary electrical power systems have created dynamic load profiles.
Samira Sadeghi, Ali Hesami Naghshbandy, Parham Moradi, Abed Bagheri   +3 more
doaj   +1 more source

Enhancement of the operating time of the overcurrent relay of the distribution network with high-level penetration of renewable energy sources

Results in Engineering
The calculation of the output current of distribution generation (DG) units interfaced with an inverter during the fault is a major issue for isolated and grid-connected distributed networks. The droop control inverter interfaced DG has controlled output
Mahmoud Aref, Mahmoud A. Mossa, Emad Abdelkarim, Khairy Sayed, Mishari Metab Almalki, Alaa F.M. Ali   +5 more
doaj   +1 more source

Design and development of an overcurrent protection relay

, 2023
Elektrik güç sistemleri, hızlı bir şekilde ele alınmazsa, pahalı ekipmana zarar verebilecek ve en kötü durumda birine bile zarar verebilecek farklı arıza türlerine karşı sıklıkla savunmasızdır. Güç sistemleri için sorun yaratabilecek bazı arıza türleri örn. aşırı gerilim, aşırı akım ve düşük gerilim.
openaire   +1 more source

Considering Pilot Protection in the Optimal Coordination of Distance and Directional Overcurrent Relays

Iranian Journal of Electrical and Electronic Engineering, 2015
The aim of the relay coordination is that protection systems detect and isolate the faulted part as fast and selective as possible. On the other hand, in order to reduce the fault clearing time, distance protection relays are usually equipped with pilot ...
Y. Damchi, J. Sadeh, H. Rajabi Mashhadi
doaj  

The Effect of Current Harmonic on Overcurrent Relay

Journal of Engineering Science, 2020
Muhammad Hafiz Mohd Rohaizad, Syafrudin Masri, Noramalina Abdullah   +2 more
openaire   +1 more source

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Microprocessor-Based Overcurrent Relays

IEEE Transactions on Industrial Electronics, 1986
Inverse overcurrent is normally associated with the overcurrent relay types, the operation time is inversely proportional (in certain degrees) with their overcurrent ratio.
Mudhafar A. Al-Nema, Sinan M. Bashi, Abdulhadi A. Ubaid   +2 more
exaly   +2 more sources

Optimal Combined Overcurrent and Distance Relays Coordination Incorporating Intelligent Overcurrent Relays Characteristic Selection

IEEE Transactions on Power Delivery, 2011
In this paper, a new objective function (OF) within the genetic algorithm (GA) approach is presented to solve the optimization problem of coordination of overcurrent and distance relays. The existing objective function of overcurrent (O/C) relays coordination is improved and extended to include the coordination of O/C and distance relays.
Hossein Askarian Abyaneh, Reza Mohammadi Chabanloo, Farzad Razavi   +2 more
exaly   +2 more sources

The Universal Overcurrent Relay

IEEE Industry Applications Magazine, 1996
A comprehensive list of nondirectional overcurrent relays would include thermal overload, inverse-time, definite time, and instantaneous relays. The list could be further classified by operating quantities including individual phase, residual, and negative-sequence current.
E. O. Schweitzer, S. E. Zocholl
openaire   +1 more source

Microcontroller based overcurrent relay and directional overcurrent relay with ground fault protection

Electric Power Systems Research, 1996
Abstract This paper presents the design and construction of overcurrent and directional overcurrent relays with ground fault protection for the protection of three-phase subtransmission and distribution systems, using a 16-bit microprocessor, the Intel 8096BH. The relay obtains the system currents at the rate of 12 samples per cycle and estimates the
Zhijun, G., Elangovan, S., Liew, A.C.
openaire   +1 more source