Journal of Engineering and Manufacturing Technology
ISSN: 2053-3535
Vol. 6(1), pp. 8-15, March 2018

Overcurrent relays coordination using MATLAB model

A. Akhikpemelo1*, M. J. E. Evbogbai2 and M. S. Okundamiya3

1Department of Electrical and Electronic Engineering, Maritime Academy of Nigeria, Oron, Nigeria.
2Department of Electrical and Electronic Engineering, Edo University, Iyamho, Edo State, Nigeria.
3Department of Electrical and Electronic Engineering, Ambrose Alli University, Ekpoma, Edo State, Nigeria.

*To whom correspondence should be addressed. E-mail:

Received 16 February, 2018; Received in revised form 07 March, 2018; Accepted 12 March, 2018.


Over-current relays, Time multiplier setting (TMS), Plug setting (PS), Relay coordination, MATLAB.

Proper coordination of protective relays at substation renders a significant part in the safe operation of power system. The principal aim of coordinating protective relays in a power system network is to obtain selectivity without sacrificing sensitivity and fast fault clearance time. In order to minimize outages, proper coordination of protective relays must be ensured. As a result of increased urbanization, a substantial increase in electric power demand has been recorded in recent years. But, owing to ineffective coordination of relay operation, there has been limited expansion in the system. This paper presents the design of a MATLAB Graphical User Interface (GUI) model of overcurrent relay (extremely inverse, standard inverse, and very inverse) using various characteristic equations in order to determine the parameters of the different relay. This paper further presents the relay coordination and setting for a 132/33 kV substation with a 3515.1 A short circuit current. The time multiplier setting (TMS), plug setting (PS) and actual operating time of the different relay was ascertained.

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