Transformer insulation pressboard is a rigid cellulose board used for barriers, spacers, cylinders and other structural insulation parts in oil-filled transformers. It offers good mechanical strength, dielectric insulation and oil compatibility.
Why Pressboard Is Used in Transformer Insulation
In transformers, insulation is not only an electrical issue. It is also a structural and mechanical issue.
That is why pressboard transformer insulation is widely used. Compared with thinner insulation papers, pressboard provides:
higher mechanical strength
better dimensional stability
stronger support for internal parts
good dielectric insulation
good performance in oil-immersed transformer systems
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