Design and construction of 25amps single phase automatic change over

Thesis Abstract

The design of this project is such that a combination of comparators digitals switches (logic IC), electronics timers and electromagnetic switches are used to achieve a very fast and effective change over in this case. This  project was entirely constructed and the thesis written by Nwalua Chukwukereze under the supervision of Engr. Ihedioha in partial fulfillment of the requirements for the award of Higher National Diploma in Electrical Electronics Engineering.

The automatic change over switch makes use of protective relays and contractors among other things which constantly monitor the power system to ensure maximum continuity of the electrical service with minimum damage to life and property. They are found mostly in domestic installations, hospital threatres, conference halls, computer centres, data and research centres, laboratories and industries that require three phase constant power supply. This equipment however is used to protect some house holds appliances from electrical faults which may arise due to voltage drop. It was designed and constructed purposely to alleviate the suffering encountered by the consumers following supply authority’s consistent failure to meet its obligations of constant and uninterrupted power supply.