DC polarized detection device and a DC polarized system method of transformer

摘要

PROBLEM TO BE SOLVED: To provide a DC-biased magnetization detection device of a transformer, which is inexpensive, does not cause an increase in the size of the transformer, and can accurately detect a DC-biased magnetization state, and to provide a DC-biased magnetization suppressing method for the transformer using the DC-biased magnetization detection device.;SOLUTION: The DC-biased magnetization detection device which detects the DC-biased magnetization state of a transformer 1 formed of an iron core 3 and windings 2 wound around the iron core 3, comprises: a search coil 21 which is formed by winding a coil conductor 22 around a pressing frame 7A made from a magnetic material provided at the iron core 3; a voltage detector 23 for detecting voltage induced in the search coil 21; a leakage magnetic flux calculation unit 24 for calculating a leakage magnetic flux interlinked to the search coil 21 on the basis of a detection output 26 of the voltage detector 23; and a biased magnetization state calculation unit 25 for calculating the biased magnetization state of the transformer 1 on the basis of a calculation output 27 of the leakage magnetic flux calculation unit 24 and outputting the result as a DC-biased magnetization state detection signal 28.;COPYRIGHT: (C)2013,JPO&INPIT