Moisture is one of the most insidious enemies of dielectric insulating oil in transformers and other high-voltage equipment. It degrades dielectric strength, accelerates cellulose aging, and can lead to costly failures. When addressing this threat, maintenance teams often weigh two primary methods: Vacuum Dehydration and Mechanical/Oil Filtration. But which one is truly best for moisture removal? The answer isn't a simple choice—it depends on the condition of your oil and your specific goals.
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