EXCITING RUSH CURRENT REDUCTION CIRCUIT FOR TRANSFORMER

摘要

PROBLEM TO BE SOLVED: To reduce an exciting rush current generated at inputting power to a transformer without taking particular measures for a standard transformer and an existing transformer.;SOLUTION: A single-phase high-voltage disconnector 10 is arranged between the high-voltage side of a three-phase transformer 8 and low-voltage side three-phase wiring 14 by which a single-phase voltage lower than a rated voltage of the high-voltage side is obtained. The single-phase high-voltage disconnector 10 is opened and closed so as to temporarily apply a single-phase low voltage of the low-voltage side three-phase wiring 14 to the high-voltage side of the three-phase transformer 8 during the stop of the operation of the single-phase high-voltage disconnector in a state that the three-phase transformer 8 is separated from a circuit by opening a three-phase high-voltage disconnector 4. Since the three-phase transformer 8 is reduction-excited at a single-phase constant voltage, the exciting rushed current generated at the opening of the operation by closing the three-phase high-voltage disconnector 4 is largely reduced.;COPYRIGHT: (C)2004,JPO