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Evaluation of Transformer Solid Insulation - …
Evaluation of Transformer Solid Insulation By Gray Transformer Chemistry Services Direct Evaluation The mechanical properties of insulating paper can be established by direct measurement of its tensile strength or degree of polymerization (DP). These properties are used to evaluate the end of reliable life of paper Insulation . It is generally suggested that DP values of 150-250 represent the lower limits for end-of-life criteria for paper Insulation ; for values below 150, the paper is without mechanical strength. Direct measurement of these properties is not practical for in-service transformers Analysis of paper Insulation for its DP value requires removal of a few strips of paper from suspect sites. This procedure can conveniently be carried out during Transformer repairs.
Evaluation of Transformer Solid Insulation By I.A.R. Gray Transformer Chemistry Services Direct Evaluation The mechanical properties of insulating paper can be established by direct measurement of its tensile strength or degree of
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