Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Clamping Pressure during Step Loading of Power Transformer with and without Prior Energisation

Inge Madshaven
* ,
Henrik Enoksen
ORCID logo ,
Lars E. Lundgaard
,
Stefan Jaufer
,
Christoph Krause
,
Borut Prašnikar
,
Asgeir Mjelve
Version 1 : Received: 15 April 2024 / Approved: 17 April 2024 / Online: 17 April 2024 (11:46:27 CEST)

How to cite: Madshaven, I.; Enoksen, H.; Lundgaard, L.E.; Jaufer, S.; Krause, C.; Prašnikar, B.; Mjelve, A. Clamping Pressure during Step Loading of Power Transformer with and without Prior Energisation. Preprints 2024, 2024041099. https://doi.org/10.20944/preprints202404.1099.v1 Madshaven, I.; Enoksen, H.; Lundgaard, L.E.; Jaufer, S.; Krause, C.; Prašnikar, B.; Mjelve, A. Clamping Pressure during Step Loading of Power Transformer with and without Prior Energisation. Preprints 2024, 2024041099. https://doi.org/10.20944/preprints202404.1099.v1

Abstract

Electrification of society, increasing renewable energy sources and mobility charging lead to new loading patterns for power transformers. Dynamic load conditions induce enhanced mechanical stress on the transformers’ windings, potentially causing degradation of the solid insulation over time and compromising the transformer's short-circuit withstand capability. Thermal expansion of the windings, caused by losses in the copper conductors, occurring as the transformer is load-ed, increases the stress. Conversely, magnetic losses in the core and tie plate expansion contribute to a reduction in stress. This paper presents the effect of step changes in core losses and copper losses by on-line measurements of the clamping pressure, to better understand the mechanical stresses acting upon the solid insulation cellulose materials.

Keywords

Power transformer; clamping pressure; transformer energisation; transformer loading; short-circuit performance; on-line measurements

Subject

Engineering, Electrical and Electronic Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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