Elimination of Stress and Reduction in Switching Time From Mains to Back-Up Power Source in Power Dependent Public Utilities by Automatic Mains and Phase Changer
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 3, Issue 6
Abstract
Most public utilities depend on electric power to function, so it is paramount that a constant power source is available. These public utilities get their supply from the public mains and in the case where the public mains fails a back-up power source is necessary to ensure the continuous operation of the public utilities. Switching the public utilities from the mains to the back-up power creates a period of time when the utilities will be without power and the longer the time delay the lesser the efficiency of the public utilities. The stress of manual switching also makes the utilities inefficient. Examples of these public utilities are street lights, traffic lights, water pumps and traffic sign indicators. A device that completely eliminates the stress of manually switching public utilities from the mains supply to the back-up supply is the Automatic Mains and Phase Changer (AMPC). It also greatly reduces the power outage time delay experience during the switching. This paper reports a research that evaluates the relationship between the stress levels during manual load switching and the stress levels using the AMPC for automatic load switching. It also evaluates the relationship between the time lag experienced with the use of the AMPC and the time lag experienced when the switching is done manually. The research involved the use of an AMPC to automatically switch from one of the phases of the 3-phase mains supply that has failed to an available phase of the same mains supply. The time lag experienced between switching when it is done automatically with the AMPC was recorded and compared with the time lag experienced when the switching is done manually. With the load being single phase, it can be switched between the phases of a 3-phase mains supply depending on which phase is available. The research also involved the use of the AMPC to provide automatic switching from the mains power supply to a back-up or generator supply. The time-lag in the automatic switching using AMPC was compared with the time-lag when the switching was done manually and the relationship between the time-lags was fully analyzed and evaluated in this paper. 20 time-lag readings were taken with the AMPC used and with the switching done manually and the analysis of the relationship between the time-lags as well as the relationship between the stress levels of both, is well documented in this paper. The result of this research showed that change-over time is greatly reduced with the AMPC, compared to manual change-over time which depends on the position of the operator relative to the position of the change-over switch.
Authors and Affiliations
Lasisi Hammed
Keywords
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