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access icon free Analysis of the non-linear behaviour of the magnetisation inductance during the frequency response test of a transformer

© The Institution of Engineering and Technology
Received 08/10/2018, Accepted 22/07/2019, Revised 08/07/2019, Published 26/07/2019

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.

Inspec keywords: power transformer testing; remanence; frequency response; magnetisation

Other keywords: three-phase transformer; transformer frequency response test; linear behaviour; response curve simulation; frequency response measurements; magnetisation inductance curve estimation; remanent magnetisation level; transformer model; nonlinear behaviour analysis; open-circuit configuration

Subjects: Transformers and reactors; Production facilities and engineering

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