2003•Unpublished venueRequires access
Aging of Cotton/Kraft Blend Insulation Paper in Natural Ester Dielectric Fluid
John Luksich
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Abstract
Previous studies show that both plain and thermally upgraded Kraft insulation paper age at a much slower rate in natural ester (vegetable oil) dielectric fluid than in conventional transformer mineral oil. This study compares the aging rate of electrical grade Kraft/cotton blend insulation paper in natural ester to that in mineral oil. Sealed steel aging tubes containing copper, aluminum, Kraft/cotton paper, and dielectric fluid (mineral oil or natural ester) were aged at 170oC for 500, 1000, and 1500 hours. The degree of paper degradation after aging is determined using paper tensile strength and paper degree of polymerization. Paper degradation and water contents of fluids and papers are compared. The Kraft/cotton paper degraded at a significantly slower rate in natural ester than in mineral oil.