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To what extent can moisture distribution prevent the dew point effect inside a transformer?
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January 20, 2026 at 5:11 pm by Laura Anderson
Moisture distribution plays a significant role in mitigating the dew point effect, but it cannot eliminate the risk entirely. When moisture is kept uniformly low and well distributed between oil and paper, the partial pressure of water vapor remains below the condensation threshold, even during load changes and cooling. This reduces the chance of free water forming on cold surfaces. However, if there are local moisture gradients or sudden temperature drops, condensation can still occur. That is why controlling average moisture and avoiding rapid thermal transients are both important for preventing internal dew formation.