The measurement & Analysis of Voltage, Current and Load Unbalance Factor at Three Phase Four Wire Load System

3상 4선식 부하설비의 전압, 전류 및 부하 불평형율 측정 분석

This paper presents a scheme on the characteristics of voltage and current unbalance factor under the load variation at the three phase 4-wire system. The voltage unbalance factor of the three-phase 4-wire system is approved by the field measurement. This system is composed of three one-phase transformer with each other capacity. Current unbalance factor is measured by the power quality measurement apparatus and compared by the load unbalance factor. Each phase has an impedance each other by the unbalanced load operation pattern and give rise to voltage unbalance.