METHOD AND DEVICE FOR DETECTING BIAS DC MAGNETIZATION OF INDUCTION ELECTRICAL APPARATUS CORE

摘要

PROBLEM TO BE SOLVED: To provide a method and device by which the need of attaching a bias DC magnetization detector directly to an induction electrical apparatus. SOLUTION: The frequency component of the noise produced from the induction electrical apparatus 1 excited by an AC voltage is checked. When it is discriminated that a frequency component which is an odd multiple of the frequency of the AC voltage is contained in the noise, it is discriminated that the iron core of the apparatus 1 is bias DC magnetized.