If you've spent any time specifying or procuring power equipment, you've likely been asked some version of this question: Why oil-immersed instead of dry type? It's a reasonable thing to wonder, especially as dry-type technology has improved significantly over the past decade.
The short answer is that oil immersed transformers earn their dominant market position not through inertia, but through a set of physical and economic advantages that become more pronounced as voltage and capacity increase. This article explains those advantages honestly — including the tradeoffs.
2026-06-11
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