Open AccessAnalysis of the non‐linear behaviour of the magnetisation inductance during the frequency response test of a transformer
Author(s) -
Herrera Portilla Wilder
Publication year - 2019
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2018.5557
Subject(s) - magnetization , inductance , transformer , linear variable differential transformer , condensed matter physics , physics , materials science , voltage , electrical engineering , engineering , magnetic field , distribution transformer , quantum mechanics
This study focuses on the analysis of the non‐linear behaviour of magnetisation inductance during a transformer frequency response test in open‐circuit configuration. For this work, frequency response measurements were made on a three‐phase transformer and a transformer model was used to simulate the response curve and to estimate the magnetisation inductance curve as a function of frequency. It was observed that the magnetisation inductance increases with increase of the test voltage. Also observed was an initial decrease at a very low frequency of the magnetisation inductance, caused by the displacement of the work point by the first elbow of the magnetisation curve. Additionally, the magnetisation inductance acquires a linear behaviour when the input small signal is sufficiently low. Finally, it was observed that the remanent magnetisation level in the core reduces the value of the magnetisation inductance.