The project is designed to provide uninterrupted AC mains supply i.e., 230 volts to a single-phase load. This is achieved by automatic changeover of the load from the missing phase to the next available phase in a 3 phase system.
It is often noticed that power interruption in the distribution system is about 70% for single-phase faults while the other two phases are in normal condition. Thus, in any commercial or domestic power supply system where 3 phase is available, it is advisable to have an automatic changeover system for uninterrupted power to critical loads in the event of missing phase.
In this system, auto-selection is achieved by using a set of relays interconnected in such a way that if one of the relay feedings to the load remains energized always. Under the phase failure condition, the corresponding step-down transformer secondary delivers zero voltage which is duly rectified to DC and then fed to the logic gates comprising of AND & OR to switch on the next relay that delivers the power to the load. It also has a provision of connecting to an inverter source which delivers uninterrupted power to the load in case all the 3 phases go missing. The project is supplied with three transformers connected to the 3 phases supply.
Further the project can be enhanced by incorporating power semiconductor devices such as thyristors/IGBTs for instantaneous changeover to the next available phase. This overcomes the drawback of the changeover time generally witnessed by relay switching operations.
- Advanced project.
- SMS Alert.
- GSM Based.
- Selection of available power.
- Arduino UNO.
- Arduino UNO IDE.