Original scientific paper

Temperature reduction in turrets - part I

Salvador Magdaleno-Adame

Abstract

This article presents the identification process of high temperatures in low voltage (LV) turrets of a single-phase generator step-up (GSU) transformer which is equipped with non-magnetic stainless steel (SS) inserts in the turrets. High temperatures are detected in the SS insert regions of the LV turrets utilizing thermography cameras and temperature labels. The presence of high temperature in the LV turrets generated issues in the transformer as the crystallization of the turret gasket seals and the presence of transformer oil leaks. To figure out the cause of the high
temperature in the turrets, three-dimensional (3-D) finite element (FE) simulations are performed. Electromagnetic analyses coupled with thermal analyses are carried out to understand the origin of the high temperatures in the turrets of the GSU transformer. To validate the 3-D FE transformer model, the results of the FE simulations are compared with the temperature measurements in the turrets. With the FE simulation results, the author detected magnetic design issues related to the SS inserts and related to the magnetic material utilized in the turrets, which are producing high temperatures. The study presented could help transformer manufacturers to predict and prevent possible heating issues in GSU transformers in the LV turret regions.

Keywords

generator step-up (GSU) transformer, low voltage (LV) turret, finite element (FE), stray loss, infrared thermography, stainless steel insert, hot spot temperature, current transformer (CT)

Hrčak ID:

275181

URI

https://hrcak.srce.hr/275181

Publication date:

6.4.2022.

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