Kompensasi Daya Reaktif pada Alat Las Listrik

Abstract

The operation of electric arc-furnace by applying 3 or I phase electric network main power supply can be done through the process of stepping down by voltage transformer rectified by diode circuits. Non linear characteristic of the transformer causes harmonic distortion and power fac/or in the electric network. Uncontinous operation of the electric arc-furnace result in variable power factor. The most efficient way of improvingthis phenomenom is using automatic swtching of capacitor hank according to the needed values. The research is done by installing the arc-furnace and PM 300 A poweranalyzer. The observation so that in no load condition indicates 0,9734 power factor in corresponds to total voltage harmonic distortion of 2.3056 %; in load of 2.6 mm arc-furnace indicates 0.8465 power factor in corresponds to total voltage harmonic distortion of 2.3702 %; in load of 3.2 mm arc-furnace indicates 0.8-107 power factor in corresponds to total voltage.harmonic distortion of 2.4541% ; in load of 5.2 mm arc-furnace indicates 0.8212 power factor in correspond to total voltage harmonic distortion of 2.7923 %; Harmonic value generated by the arc-furnace are less 5 % as administrated by PT.PLN. While the power factor value in loaded condition administrated by PT. PLN. is 0.85. To improve electric powerfactor is done by installing shunt capacitor of to the electric arc-furnace. The calculation result in value of capacitance of 10.7011 mF at no load condition; 67.1735 mF at 2.6 mm electrode diameter load: 108.1548 mF at 3.2 mm electrode diameter load; 166.7223 mF at 5.2 mm electrode diameter load Installing the capacitor bank controlled automatically to corresponding values, result in losses of reactive power factor minimum. As consequence the method may increase the efficiency of electric power use caused by the use of electric arc-funance. Keywords: Reactive Power, Compensation, Arc-Furnac