Development and construction of automatic three-phase power changeover control circuit with alarm

One primary reason for Nigeria economic underdevelopment is the inconsistency of power supply, and as a result this fact, immediate attention required. The criticality an uninterrupted supply cannot be overemphasised. Therefore, work, new approach applied to switch from three-phase source another without human interference. This work presents automatic three (3) phase changeover circuit with alarm that turns Power Holding Company (PHCN) generator at instant interruption or outage PHCN. signal introduced notify user restoration PHCN automatically carries out process. process achieved by using logic control circuits, sequence monitors, phase(s) failure monitor, overload relay, contacting relays practical switching which takes approximate 30 seconds.