Unbalanced Analysis of Changing Medium-Voltage Distribution Feeders from Open-Loop to Closed-Loop Arrangement

This paper presents an analysis of the unbalanced operating situations of a medium-voltage distribution feeder whose arrangement is changed from an open-loop to a closed-loop type. First, a sample system involving an open-loop distribution feeder is constructed. Second, the sample system is modeled and simulated by the OrCAD PSpice simulation software. The transformers and feeders in the sample system are all modeled in coupling-free equivalent circuits via the decoupling technique. Finally, unbalanced operating situations of changing medium-voltage distribution feeders from an open-loop to a closed-loop arrangement are analyzed.