THREE PHASE VOLTAGE AND CURRENT FLUCTUATION RECORDER WITH SINGLE DISPLAY USING MICROCONTROLLER

The quality of power supplied is affected by various internal and external factors of the power system. The presence of harmonics, voltage and frequency variations deteriorate the performance of the system. In this paper the frequently occurring power quality problem- voltage variation is discussed. The voltage sag/dip is the most frequently occurring problem. There are many methods to overcome this problem. Among them the use of FACT devices is an efficient one. This paper presents an overview of the FACT devices like- DVR, D-STATCOM, and Auto-Transformer in mitigating voltage sag. All kinds of input parameters will be first converted into voltage level by using proper transducers. Then these voltages are given to the analog input pin of micro controller circuit ATMEGA-16. The port lines are connected to the LCD display. The set pot and key input are connected to the micro controller. The microcontroller senses the voltage level and current level and counts the no of fluctuation status. If enter recall key we can see the no of fluctuations status. Here we develop the circuit with easily available ICs, the operation and installation of our unit is not a risky one. We can easily provide the unit in Main panel Board.