Design a protection scheme using ETAP

Abstract

This master report focuses on the design of a comprehensive protection scheme for industrial distribution systems, with a specific emphasis on the SCMI “GICA” factory. Using ETAP software, the report aims to develop and simulate an efficient protection scheme. The primary objective is to improve selectivity by replacing the definite time curve with the Inverse Definite Minimum Time (IDMT) curve, combining time selectivity and current-based methods. This approach effectively addresses challenges related to transient response and undesired tripping during high-current faults, particularly between successive short lines. Furthermore, the thesis proposes innovative solutions to mitigate the motor contribution during short circuits. The protection scheme design includes the meticulous selection and calibration of protective relays and current transformers (CTs) for various electrical elements such as transformers, motors, and busbars. Through extensive testing and validation using ETAP simulation, the proposed protection scheme and solutions demonstrate their effectiveness and reliability. This research significantly contributes to the field of industrial distribution system protection scheme design, particularly in terms of selectivity improvement, transient response handling, and motor contribution mitigation. The successful implementation and simulation of the proposed protection scheme highlight its practicality and efficiency in real-world applications. The findings provide valuable insights for professionals involved in designing protection schemes for similar industrial distribution systems.