Measurement of Local Two-dimensional Magnetostriction of Three-phase Transformer Model Core

Abstract

　Magnetic analysis method considering vector magnetic characteristic and two-dimensional magnetostriction of electrical steel sheet is suggested and distribution of the two-dimensional magnetostriction on transformer model core is clear by the analytical method. In particularly, the large magnetostriction occurs at T joint part due to occurrence of rotating magnetic flux. And, large principal magnetostriction of contraction occurs in rolling direction at same part. In order to validate the validity of the analyzed results, it is necessary to measure the local two-dimensional magnetostriction of the transformer model core. This paper presents measurement of the local vector magnetic characteristic and the local two-dimensional magnetostriction of three-phase transformer model core and the measured results are discussed.