Power Systems are prone to damage due to overcurrent as a result of faults like ground faults, line faults, short circuit etc. In order to curb the damage caused by these faults suitable protects systems must be placed. The protection system usually consists of a primary system and a backup system with proper coordination between the two systems (i.e. their tripping time) in order to ensure proper clearance of faults in minimum time. In this paper, the optimization of overcurrent relays which are primarily used as backup systems against these faults are analyzed. The application of swarm intelligence algorithms: Ant Colony Optimization and Firefly Algorithm in radial system are done in order to obtain the time multiplier settings of the relays. This enables us to achieve proper coordination between the overcurrent relays in the network. © 2017 IEEE.

Gnana Swathika O V

Electrical

School of Electrical Engineering

Chennai Campus

K. I. Tharakan

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

&nbsp;

&nbsp;

VIT University

2017 International Conference on Computing Methodologies and Communication (ICCMC)

This paper presents Big-M method and Dual Simplex method for optimum time coordination of over current relays in a distribution network. These methods are used to find the optimized values of time multiplier settings (TMS) of relays using linear programming problem (LPP). Objective function contains artificial variables in Big-M method. Dual simplex gives the optimum solution without introducing any artificial variables. Over current (OC) relay plays a major role in power distribution system. It protects electrical power systems against excessive current which are caused by faults like short circuits, ground faults, etc. The fault is cleared within a least possible time. Big-M and Dual simplex technique are presented in this paper for optimum time coordination of OC relays in a radial fed distribution system. © 2015 IEEE.

2015 International Conference on Computational Intelligence and Communication Networks (CICN)

Optimum Coordination of Overcurrent Relays in Distribution Systems Using Big-M and Dual Simplex Methods

Protection system includes a series of devices whose main purpose is to protect people and primary electric power equipment from the effects of faults. Fault currents cause damage to equipment and are also hazardous to personnel. Thus, there should be a primary and a backup system with proper time grading between systems, i.e. Tripping time should be maximum for the point farthest from the fault location. Over current (OC) relays are used as backup protection against these faults. The coordination time interval must be maintained among relays during faults. Various algorithms are used to optimize the time of operation of these OC relays. This paper implements Dual Simplex and Genetic Algorithms (GA) on a radial network and identifies the time multiplier setting (TMS) of the relay. This facilitates in achieving suitable OC relay coordination of the network. © 2015 IEEE.

Optimum Coordination of Overcurrent Relays Using Dual Simplex and Genetic Algorithms

International Journal of Electrical Power & Energy Systems

Optimal overcurrent relay coordination in power distribution system using a new approach

2011 International Conference on Energy, Automation and Signal

Optimal overcurrent relay coordination in distribution system

IEEE Transactions on Power Delivery

An on-line relay coordination algorithm for adaptive protection using linear programming technique

Optimum coordination of using overcurrent relay using firefly and ant colony optimization algorithm

Journal	Data powered by Typeset2017 International Conference on Computing Methodologies and Communication (ICCMC)
Publisher	Data powered by TypesetIEEE
Open Access	0