Abstract
Proper monitoring of electrical apparatus that has power consumption is a step towards efficient energy and saving management. Parameters of electrical power system have wide variations during operation of electrical devices. These changes in the parameters required to be measured using accrued meter. This paper presents design and implementation of AC multi-meter based on Arduino for three-phase synchronous generator. This meter measures the values of load current, terminal voltage and the frequency. In addition, it used to detect the abnormal operation of three-phase synchronous generator (overload, under and over voltage, and low and high frequencies). The multi-meter displayed the measured parameters and the protection status of each data directly on LCD, and serial print of the Arduino software program in PC via USB cable. A smart monitoring for these operation conditions designed using a Bluetooth module. Two sensors have been used with multi-meter; current sensor type ACS-712, and ac voltage sensor type ZMPT101b. The frequency has been measured utilizing the ac voltage sensor signal, i.e. it measured without using any external zero crossing detector hardware circuit.
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