Modeling Overcurrent Protection

Sharifah Khadijah, Syed Sulaiman (2009) Modeling Overcurrent Protection. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this project is to modeling the overcurrent protection system for analysis on that system of protection. The testing procedure focuses in setting the overcurrent relays and inject current to the current transformer to analyses the time of tripping. Prior to that, the equipment that available in the protection lab, UTeM is used to study and analyze the performance to be compared with data manual provided by the manufacturer. Protection against excess current was naturally the earliest protection system to evolve. From this basic principle, the graded overcurrent system, a discriminative fault protection, has been developed. This should not be confused with 'overload' protection, which normally makes use of relays that operate in a time related in some degree to the thermal capability of the plant to be protected. Overcurrent protection, on the other hand, is directed entirely to the clearance of faults, although with the settings usually adopted some measure of overload protection may be obtained. In electricity supply, overcurrent or excess current is a situation where a larger than intended electric current exists through a conductor, leading to excessive generation of heat and the risk of damaging infrastructure and equipment and causing fires. Possible causes for overcurrent include short circuits, excessive load, and incorrect design. Fuses, circuit breakers, temperature sensors and current limiters are commonly used protection mechanisms to control the risks of overcurrent.

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