Device for determining cause of occurrence of voltage imbalance, method for determining occurrence cause of voltage imbalance

摘要

It is considered that a plurality of pole transformers connected to any two phases of the three phases of the three phase distribution line are evenly connected to the three pairs of the three phases of the three phase distribution lines and the three phase distribution lines A first arithmetic device which calculates a first influence degree corresponding to a first voltage imbalance rate of the three phase distribution lines and a second voltage unbalance ratio of the three phase distribution lines, A second arithmetic device for calculating a second influence degree corresponding to the unbalance rate, and a determination device for determining a cause of occurrence of voltage imbalance in the three-phase distribution line based on the first and second influence degrees .