Low cost three-phase electrical power quality analyzer system using PC-based USB DAQ

Industrial, commercial, and residential sector growth increases the demand of quality in power utility. Power quality and energy measurements support utility company to provide information about energy supply. Meanwhile, the increasing electronic devices in home and industry require high quality of device . The use of PC-based DAQ USB makes it easy to display data in the form of numbers and graphics, and makes it easier to choose the parameter variables to be monitored. This research was conducted to monitor the quality of power in a three-phase electric load in the form of a three-phase electric motor with parameters such as frequency, voltage, current, total harmonic distortion. In this study the data obtained total harmonic distortion values at 50Hz frequency of 17.52% for voltage and 16.32% for currents in the R phase, 18.10% for voltages and 13.62% for currents in S and 18 phases, 55% for voltage and 20.46% for currents in phase T. While at 35Hz the frequency obtained total harmonic distortion of 39.38% for voltage and 43.49% for currents in phase R, 42.68% for voltage and 49, 32% for currents in phase S, and 51.01% for voltages and 38.18% for currents in phase T. With an error percentage of 8.3% for total harmonic distortion voltages, and 10.96% for currents prove this tool quite valid. The unbalance is also monitored in the results of the phasor diagram