Abstract
In order to clarify the vacuum drying and impregnation process of lapped insulation paper layer, permeability of i) cylindrical model insulation layers made of lapped paper tapes, and of ii) piled annular paper sheets along their inter-surfaces, is measured. The results are ; (1) Permeability of measured insulation layer per 1 tape, is 23 times larger than that of the original paper sheet, owing to flow passing the inter-surface and gaps between tapes. So it also increases by drying due to shrinkage of paper thickness.(2) Permeability of the inter-surface of measured annular sheets per 1cm × 1 cm is comparable with that of the paper sheet itself per 1 cm2, but widely changes with pressing stress. (3) Permeability of paper lapped layer can be calculated from permeability of the sheets and of the inter-surface.(4) These informations are useful in analyzing a drying or impregnation process of paper insulation layer.
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