Evaluation method of the magnetostrictive or noise of an electromagnetic steel sheet for three-phase transformer core which is excited by a sine wave.

摘要

PROBLEM TO BE SOLVED: To provide its method in this invention, though requiring a highly accurate magnetostriction evaluating method of an electromagnetic steel plate, for controlling a noise level of a transformer iron core to a regulated value or less.;SOLUTION: This magnetostriction or noise evaluating method of the electromagnetic steel plate for a transformer is characterized by evaluating magnetostriction or noise of the electromagnetic steel plate for the transformer, by measuring the magnetostriction at its time, by generating its magnetic flux density waveform in an electromagnetic steel plate sample by controlling an excitation voltage waveform of a magnetostriction measuring device, by estimating the magnetic flux density waveform of a local part in the transformer iron core by measurement or a calculation.;COPYRIGHT: (C)2010,JPO&INPIT