In a basic electricity network, the quality of electric power distribution is needed. There are also obstacles in the distribution of electric power that can affect, let alone damage, the electric power system. If this voltage constraint is connected to electrical or electronic equipment and exceeds the nominal voltage tolerance limit, it can interfere with the performance of the equipment or moreover it can damage it. From the testing of the Arduino uno microcontroller-based under / over voltage relay tool, it can be concluded that the under / over voltage relay device designed and made can work properly, in the sense that this tool can detect an under voltage of -5% and an over voltage of +5. % of nominal voltage and able to activate the fault indicator light and sound an alarm when the under / over voltage setting is exceeded
Kualitas tenaga listrik dalam suatu sistem rangkaian listrik sangat diperlukan. Kualitas suplai listrik yang buruk dapat menyebabkan gangguan dan bahkan merusak system peralatan atau rangkaian listrik. Salah satu bentuk gangguan tersebut adalah terjadinya under/over voltage. Untuk mengatasi hal tersebut diperlukan suatu alat proteksi yang dapat mendeteksi adanya ganggguan under/over voltage serta mengamankan peralatan listrik. Under/over voltage relay berbasis mikrokontroler ATmega 328 dirancang untuk mendeteksi adanya gangguan under/over voltage pada tegangan satu fasa 220 V 50 Hz. Batas tegangan untuk ganguan under voltage yaitu -5% dari tegangan normal 220 V, sedangkan gangguan over voltage yaitu +5% dari tegangan normal. Dan setting delay untuk under/over voltage adalah 5 detik. Output dari relay dihubungkan pada kontaktor, kontaktor akan memutuskan aliran listrik apabila terjadi gangguan under/over voltage. Dari hasil penelitian yang dilakukan, relay under/over voltage berbasis mikrokontroler ATmega 328 yang dirancang dapat bekerja dengan baik. Relay dapat mendeteksi gangguan under voltage -5% dan gangguan over voltage +5% dari tegangan nominal
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