This paper discusses the measurement of harmonic content using arduino which is simulated with proteus software. The components used in this meter harmonic circuit are resistor, capacitor, LCD, microcontroller atmega 328P. Microcontroller works based on voltage source (TR1) and current source (TR2) on proteus software. The voltage and current delivered to the microcontroller will be read and executed according to the program on the microcontroller. The program used in this arduino microcontroller is the C language program. The results obtained from this study Arduino successfully measure the harmonic content and display the measurement results on the LCD.

This paper presents the results of the analysis of a combination of a single tuned filter (STF) and a double tuned filter (DTF) to reducing harmonic currents in a three-phase system. From the research that has been done, obtained significant results in reducing the current harmonic content in the three-phase system. THDi from 25.49% reduced to 14.84% and the 5 th harmonic content is 21.69% reduced to 13.45%, the 7 th harmonic content is 10.26% reduced to 4.63%, the 11 th harmonic content is 6.42% reduced to 2.33%, and the 13 th harmonic content is 4.46 %% reduced to 1.32%.

Harmonics generated by non-linear loads will cause the current to be in the form of short pulses. From the measurement data conducted, there is a harmonic on Individual Harmonic Distortion (IHDi) fifth order on current transformer that is not compliant with IEEE 519 -1992 standard. In this study aims to compare the use of passive LC filter with Passive Single-Tuned Filter in reducing harmonics current is simulated using computer program. The simulation results show the Current Individual Harmonic Distortion (IHDi) fifth order in the current transformer is reduced according to IEEE standard 519 -1992 where IHDi fifth order is reduced to 0.04% using Passive LC Filter and 1.14% using Passive Single-Tuned Filter and THDi decreased to 0.28% using Passive LC Filter and 2.54% using Passive Single-Tuned Filter.

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