Design and implementation of android base automatic phase selector and overload protector using GSM
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Date
2019-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Kampala International University,School of engineering & Applied Sciences – [SEAS] Department of electrical, Telecommunication and Computer Engineering
Abstract
ABSTRACT
The project is designed to automatically supply continuous power to a load through one of the three sources of supply that are: solar, mains and generator or to combine the sources to supply the load all together at the same time.
The three socket outlets represent the three sources. The sockets outlets are connected to three step down transformers which reduce the input 230V or 240V to 12Vac. These 12Vac are rectified and regulated to 5Vdc which act as an input to the microcontroller. Once the microcontroller recognize the present of a given source, a relay module is switch to an ON position. In case all the three sources are available, an android app is used to select the source of choice. When the amount of load demand increases beyond what can be handle by one source, a mobile app is used to bring on board another of the remaining two sources so as to meet the load demand. A filament bulbs were used as a load for demonstration purpose which draws power from solar. When solar fails to supply power, automatically the source will shift to main grid and if main grid fail, the load will automatically be supply by generator. But if solar come back when any one of the two sources is ON, the system will automatically shift to solar. The output of any source is connected to voltage stabilizing circuit which stabilize the voltage to 220Vac by a mean of an auto-transformer which has many taps. When there is any fluctuation in the input voltage, the voltage sensor will activate the relays to switch between the taps of an auto-transformer so as to either reduce or increase the incoming voltage so that the load voltage requirement is met. From the stabilizing circuit, the load is connected through an overload protector circuit which monitor the amount of current drawn by the load. Once the current goes beyond normal value, the last load connected is automatically isolated from the source while leaving the original part of the circuit connected. At the same time a message is sent to the operator by GSM notifying that the circuit is overloaded. The operator can decide to operate the loads by mean of GSM or by sending a text message “normal” to restore the system operation to use an android app.
Description
Final year project report submitted to Kampala international university in partial fulfillment of the requirement for the award
Of Bachelor of Science in Electrical Engineering
Keywords
Design & implementation, Using GSM, Automatic phase, Andriod