Results 131 to 140 of about 489 (178)

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
openaire   +1 more source

Effect of relay characteristics in optimum coordination of overcurrent relays

2020 IEEE Students Conference on Engineering & Systems (SCES), 2020
The coordination of overcurrent relays require minimum tripping time at maximum fault current while backup relays, experiencing low fault current, follow the coordination criteria. The challenges arise as overcurrent characteristics perform diversely according to the magnitude of fault currents.
Tejas M Vala, Vipul N Rajput, Kevin Joshi, Dipayan Guha   +3 more
openaire   +1 more source

The effects of harmonics on overcurrent relays

2016 17th International Scientific Conference on Electric Power Engineering (EPE), 2016
This paper analyses the influence of current harmonics on protections devices connected to the power system which can cause serious problems. This paper outlines work that has been conducted to test of overcurrent relay and to identify the impacts of harmonics on distribution utility protection and control systems.
Kinan Wannous, Petr Toman
openaire   +1 more source

Design and Implementation of Overcurrent Protection Relay

Journal of Electrical Engineering & Technology, 2020
Protective relays have been designed with different technologies resulting in electromechanical, solid-state, and numerical devices. Speed and reliability are the two most important characteristics of a protective relay. Other capabilities such as monitoring and recording are supposed to be of secondary priority. The new technology using combination of
Mohammed Y. Suliman, Mohammed Ghazal
openaire   +1 more source

Correlation functions based directional overcurrent relay

2012 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2012
This paper describes a new directional overcurrent relay for protection of interconnected distribution network and DG unit. When the relay current exceeds its pick-up value, correlation of the voltage and current at the relay point as well as partial autocorrelation of the current are calculated.
Ebrahim Farjah, Teymoor Ghanbari, Saeed Rezaee   +2 more
openaire   +1 more source

Operation Logic Proposed for Time Overcurrent Relays

IEEE Transactions on Power Delivery, 2006
This paper presents a new logic of operation for time overcurrent relays. With the application of the proposed technique, the sensitivity of time overcurrent relays is increased. In order to obtain this, the relay operates with a dynamic pickup setting, such as load current. Additionally, fast operation of overcurrent relays is obtained. The functional
A. Conde, E. Vazquez
openaire   +1 more source

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.
Reza Mohammadi Chabanloo, Hossein Askarian Abyaneh, Somayeh Sadat Hashemi Kamangar, Farzad Razavi   +3 more
openaire   +1 more source

Current-Only Directional Overcurrent Relay

IEEE Sensors Journal, 2011
Overcurrent relays are widely used for protection of power systems, directional ones for transmission side, and nondirectional ones for distribution side. The fault direction may be forward (between relay and grid), or reverse (between relay and source), the normal power flow being from source to the grid. Known directional overcurrent relays rely on a
Abhisek Ukil, Bernhard Deck, Vishal H. Shah   +2 more
openaire   +1 more source

Directional overcurrent relays

2011
Directional overcurrent protection is used when it is necessary to protect the system against fault currents that could circulate in both directions through a system element, and when bidirectional overcurrent protection could produce unnecessary disconnection of circuits.
openaire   +1 more source

Time-Overcurrent Relay Coordination: A Review

International Journal of Emerging Electric Power Systems, 2005
When two protective apparatus installed in series have characteristics, which provide a specified operating sequence, they are said to be coordinated or selective. The coordination of directional overcurrent relays poses serious problems in the modern complex power system networks, which are interconnected.
Dinesh Birla, Rudra Prakash Maheshwari, Hari Om Gupta   +2 more
openaire   +1 more source