Transformers Magazine, Vol. 12 No. 3, 2025.
Original scientific paper
On the energizing of a natural ester-filled transformer: Cold start for offshore application
Ahmed Gamil
Abstract
In cold climates offshore applications, using natural ester liquids reveals challenges due to their higher pour points compared to mineral oil. Laboratory experiments have shown that the critical concern for transformers in cold climates applications is the temperature at which solidification begins, which is higher than the pour point. This study tested a natural rapeseed-based ester liquid for energizing at subzero ambient temperatures. A case study involved exposing a natural ester-filled transformer to -15°C for approximately 400 hours, followed by energization. Liquid samples were taken before and after energization to observe changes in properties under these conditions.
Keywords
power transformer; cold climate; natural ester; partial discharge; thermal time constant
Hrčak ID:
333376
URI
Publication date:
7.7.2025.
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