Transformers Magazine, Vol. 13 No. 3, 2026.
Original scientific paper
Managing insulation aging through direct hot-spot temperature measurement - Part I
Andrea Tonin
Fiorenzo Stevanato
Abstract
Transformer winding hot spot temperature strongly influences insulation aging and risk of failure. This article reviews direct hot spot measurement using gallium arsenide-based fibre optic sensors installed in the winding. The method provides in situ temperature data at critical locations, reducing reliance on thermal models and hotspot estimation. Practical benefits include improved loading decisions, better validation of design margins, and more accurate aging assessment for condition-based maintenance and asset management.
Keywords
transformer; winding hot spot; fibre optic monitoring; gallium arsenide; insulation aging
Hrčak ID:
349997
URI
Publication date:
9.7.2026.
Visits: 0 *