Rancang Bangun Modul Portable Power Analizer Untuk Menganalisa Harmonisa

ABSTRACT Increasing of electrical power system containing harmonic current and voltage causes many serious effects involving worse power factor of the system, interference problem of telecommunication system, increasing of the system�s losses and many other problems of electronic tools. It causes ineffectively electrical energy. Engineering of portable power-analyzer module to analyze harmonic by evaluating the amount of harmonic signals�current and voltage signals is the aim of this final project. The instrument can be used to know about current and voltage THD value is fluke 41b power harmonic analyzer. This instrument has percentationof error about 1 %. The problem of this instrument is expensive price obout 13 million rupies, so for medium to low class is difficult to get it. So, distortion effect of non-sinusoidal signals caused non-linear loads can be evaluated. AT Mega 32 is one of microcontrollers having 10 bits resolution of internal ADC which can be able to convert current and voltage signals from analog to digital signals processed to be apart from the fundamental signal by Discrete Fourier Transform (DFT). Finally, information of the signal condition is displayed on graph LCD of G12864C. Based on the testing of this system wholly, showing the system works better, proven if compared with fluke 41B power harmonic analyzer. For example at practice with oscilloscope load, shown at the tool what me make, the voltage THD value is 4,2 % and the current THD value is 58,4 %. But at fluke 41B, shown the voltage THD value is 3,2 % and current THD is 59 %. So for difference average of voltage THD value is 1,8 % from thirteen times of practice with another load. And difference average of current THD value is 1,96 % from thirteen times of practice with another load. Key words: Harmonic, ADC, DFT, THD