Publication Date: 2023/06/17
Abstract: The reliability and security are major aspects of a power system. However, the fast development in electrical systems makes the protection more complicated and difficult to achieve the desired objective. These relays have many advantagessuch as fast operation. The use of relay protection enhances the reliability and security of the electrical systems. In this paper,an overcurrent relay is modeled using MATLAB/SIMULINK. The overcurrent relay was chosen as it is widely used in fault detection and clearance of power systems and grids. A relay by definition is an electromechanical switch which is used to sense faults in transmission lines and once the fault is detected, sends a signal to trip the circuit breaker. The overcurrent relay in specific operates when the load current goes beyond the pick-up current value. This paper discusses two important types of protections for overcurrent in the power system, i.e., primary protection and backup protection. For primary protection, every line is provided with an overcurrent relay that trips the circuit breaker when the fault occurs as opposed to backup protection where one relay is given for multiple lines which operates with a definite time delay in absence of the primary protection.
Keywords: Overcurrent Relay, Circuit Breaker, Trip, Fault, Primary, Backup.
DOI: https://doi.org/10.5281/zenodo.8049846
PDF: https://ijirst.demo4.arinfotech.co/assets/upload/files/IJISRT23MAY2272.pdf
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