Magnetic flux leakage, eddy current loss and temperature distribution for large scale winding in UHVDC converter transformer based on equivalent 2D axisymmetric model

Liu, Cong; Hao, Jian; Liao, Ruijin; Yang, Fan; Li, Wenping; Li, Zhiwei

doi:10.1007/s00202-023-02020-0

Cited by 1 publication

(1 citation statement)

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“…The issue of the temperature rise in transformers is primarily governed by the dynamic equilibrium between heating and cooling. Electromagnetic losses constitute the main source of heat [5], while eddy current losses and additional stray losses exacerbate this condition [6]. During normal operation, the maximum temperature in the windings can exceed 80 • C [7], with temperature rises surpassing 40 • C, and a bidirectional coupling relationship exists between electromagnetic losses and temperature [8].…”

Section: Introductionmentioning

confidence: 99%

Full-Scale Modeling and FBGs Experimental Measurements for Thermal Analysis of Converter Transformer

Yang,

Gao,

Wang

et al. 2024

Sensors

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As the imbalance between power demand and load capacity in electrical systems becomes increasingly severe, investigating the temperature variations in transformers under different load stresses is crucial for ensuring their safe operation. The thermal analysis of converter transformers poses challenges due to the complexity of model construction. This paper develops a full-scale model of a converter transformer using a multi-core high-performance computer and explores its thermal state at 80%, 100%, and 120% loading ratios using the COUPLED iteration method. Additionally, to validate the simulation model, 24 FBGs are installed in the experimental transformer to record the temperature data. The results indicate a general upward trend in winding the temperature from bottom to top. However, an internal temperature rise followed by a decrease is observed within certain sections. Moreover, as the loading ratio increases, both the peak temperature and temperature differential of the transformer windings rise, reaching a peak temperature of 107.9 °C at a 120% loading ratio. The maximum discrepancy between the simulation and experimental results does not exceed 3.5%, providing effective guidance for the transformer design and operational maintenance.

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