Degradation characteristics of insulation near aluminium foil edges inside dry‐type bushing cores under electrothermal compound stress

Autor: Ming Chen, Xuandong Liu, Yuhang Shao, Gaoyi Shang, Qiaogen Zhang, Hao Tang, Libao Liu
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: High Voltage, Vol 7, Iss 6, Pp 1153-1164 (2022)
Druh dokumentu: article
ISSN: 2397-7264
DOI: 10.1049/hve2.12204
Popis: Abstract Insulation breakdown of dry‐type valve‐side bushing cores under electrothermal compound stress has become a key factor limiting the safe and stable operation of the converter transformer. Based on slices of the real bushing core, it is observed for the first time that fold, peeling off, and fracture defects exist near the aluminium (Al) foil edge, accompanied by many metal spikes with a curvature radius
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