Design and Implementation of a Three-Phase Automatic Changeover Switch Using CAD Electrical Simulation

Abstract

The advantages of using an automatic changeover switch, which involves switching power from one source to another, is enormous. An automatic change-over switch system ensures a continuous power supply to load in case the mains supply is faulty. Manual power switching from one source to another takes time and may delay some processes, rendering it disadvantageous. In this project, we designed and implemented a three-phase automatic changeover switch system for Ashesi University to ensure an uninterrupted power supply to the institution's electrical infrastructure. The ECG is the system's primary power source, with a generator set as an alternate power supply in the event of ECG power failure. When the ECG power source fails, the system automatically switches to the generator set within a specified time limit and then returns to the ECG power supply when it becomes available. The system was designed using a combination of contactors, relays, timers, starters, and switches. This project has a substantial impact since it assures that Ashesi University's electrical infrastructure has an uninterrupted power supply, eliminating the risk of data loss, service disruption, and life endangerment.