Results 231 to 240 of about 75,003 (271)

Optimal coordination of directional over-current relays using informative differential evolution algorithm

Journal of Computational Science, 2014
Abstract Growing interconnection in distribution system creates new problem for protection engineers. Particularly the design of overcurrent relay coordination in such system is an independent area of research. With the availability of new artificial based optimization algorithm relay coordination research gain a new momentum.
Manohar Singh, Bijaya K. Panigrahi, Abhijit R. Abhyankar, Swagatam Das   +3 more
openaire   +1 more source

Protection of microgrid through coordinated directional over-current relays

2014 IEEE Global Humanitarian Technology Conference - South Asia Satellite (GHTC-SAS), 2014
Microgrids integrate distributed energy resources to provide reliable, environment friendly and economic power to small/medium sized urban communities or to large rural areas. Due to the existence of generators at all levels of the distribution system and two distinct operating modes, i.e.
openaire   +1 more source

Non-adaptive over current relay coordination in distribution systems

2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2014
Over current relay coordination in a meshed distribution system with multiple distributed renewable energy sources (RES) is a very challenging for the protection engineers. The exiting over current relays in the distribution system is set for some predefined network topology and fault currents.
openaire   +1 more source

A New Objective Function for Optimal Coordination of Directional Over-current Relays

2020
This paper presents a novel objective function to obtain the optimum relay settings of directional over-current relays (DOCRs). The proposed improved objective function (IOF) is developed to solve the problems of previously proposed OFs. The proposed research work modifies the previous OFs by introducing a new weighting factor and adding a new term ...
Jay Shah, Nirmal Khristi, Vipul N. Rajput, Kartik S. Pandya   +3 more
openaire   +1 more source

Adaptive over current relay coordination algorithm for changing short circuit fault levels

2015 IEEE Innovative Smart Grid Technologies - Asia (ISGT ASIA), 2015
Fault levels are continuously changing in the electric networks due to change in the network impendences and configurations. These changes causes maloperation of the over current relays. An over current relay coordination algorithm is proposed in this paper, which utilizes adaptive fuzzy technique to select the optimal relay settings.
Manohar Singh, Vishnuvardhan Telukunta
openaire   +1 more source

Study on Protection Coordination of a Flux-Lock Type SFCL With Over-Current Relay

IEEE Transactions on Applied Superconductivity, 2010
In this paper, the method for the protection coordination of a flux-lock type superconducting fault current limiter (SFCL) with an over-current relay (OCR) was proposed. Immediately after the fault happens, the fault current can be limited by the flux-lock type SFCL and, if the fault continues, can be interrupted by the circuit breaker (CB) after ...
J S Kim, S H Lim, J C Kim
openaire   +1 more source

An improvement in coordination of distance and over current relays for DERs connected power networks

2015 Annual IEEE India Conference (INDICON), 2015
Distance relays are set in coordination with the over current relays for protection of transmission power lines. Depending upon the location of faults on the transmission lines, faults are cleared by the distance relays from zone-1 or zone-2. If the distance relays fails due to any relay failure reasons.
Manohar Singh, Manikya Sastri, null Vishnuvardhan T   +2 more
openaire   +1 more source

Use of genetic algorithms (GA) for optimal coordination of directional over current relays

2012 Students Conference on Engineering and Systems, 2012
In this paper, the optimization of coordination of directional overcurrent relays in an interconnected power system is presented. The objective of protective relay coordination is to achieve selectivity without sacrificing sensitivity and quick fault clearance time.
Dharmendra Kumar Singh, Shubhrata Gupta
openaire   +1 more source

A new hybrid particle swarm optimization for optimal coordination of over current relay

2010 International Conference on Power System Technology, 2010
Directional over current relays (DOCRs) coordination problem is a nonlinear and nonconvex problem which has many constraints. Optimal coordination of over current relays has been usually solved using linear and nonlinear programming. Also genetic algorithm and particle swarm optimization methods are used to fined the optimal solution of the problem. In
M. Bashir, M. Taghizadeh, J. Sadeh, H. Rajabi Mashhadi   +3 more
openaire   +1 more source

Optimal coordination of distance and over-current relays in series compensated systems based on MAPSO

Energy Conversion and Management, 2012
In this paper, a novel problem formulation for optimal coordination between distance relays and Directional Over-Current Relays (DOCRs) in series compensated systems is proposed. The integration of the series capacitor (SC) into the transmission line makes the coordination problem more complex.
Zahra Moravej, Mostafa Jazaeri, Mehdi Gholamzadeh   +2 more
openaire   +1 more source