351 / 2022-03-15 17:03:10

An improved mothed to estimate the parameters of duality-derived VT models

voltage transformer,duality,leakage inductance,magnetizing inductance

The parameters of the duality-derived transformer model depend on the experimental test or FEM simulations. However, one must spend much time on the tests or simulations. Another solution is to estimate the parameters of transformers. In the conventional estimation method, the regions around the iron core of windings are not completely considered. Furthermore, most inductive VTs are core-type transformers, and the windings are coaxial. The structure of the VTs is not completely symmetrical. For example, the gap between the yoke and windings. Thus, this paper proposed an improved method to estimate the parameters of the duality-derived VT model by appropriately considering the regions around the iron core and windings. In this paper, a detailed duality-derived VT model is derived, considering the asymmetric part of VTs. The regions that need to be considered are divided into several parts, according to the location and structure of the windings and iron core. The ferroresonance, short-circuit test, and the corresponding simulations are implemented to validate the proposed method. The results show the proposed method can improve the accuracy of the estimated leakage inductance and nonlinear magnetizing inductances. The regions around the windings and iron cores of inductive VTs should be appropriately considered in the estimation of the parameters in the duality-derived model.