부산대학교 도서관

The residual flux measurement is one of the difficulties in the transformer research field. This article presents a residual flux density (${B} _{\mathrm {r}}$) measurement method considering the relative differential permeability ($\mu _{\mathrm {rd}}$) of the core material. First, the basic relationship between $\mu _{\mathrm {rd}}$ and ${B} _{\mathrm {r}}$ is analyzed on the basis of the magnetic domain theory. Then, combining the experimentally measured relationship between ${B} _{\mathrm {r}}$ and $\mu _{\mathrm {rd}}$ , using $\mu _{\mathrm {rd}}$ as an intermediate variable, the relationship between ${B} _{\mathrm {r}}$ and time constant is derived. Furthermore, a square iron core model is established by the finite-element method, and the empirical formula for calculating ${B} _{\mathrm {r}}$ is was fit. Finally, the feasibility of this method and the accuracy of the proposed empirical formula are verified through experiments. [ABSTRACT FROM AUTHOR]