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Presspaper and pressboard products made from pure kraft pulp have been used successfully for decades for the solid insulation of power transformers. Many researchers have investigated the aging behavior of such cellulose products in the past. In the recent years, the transformer industry started to use significantly higher quantities of laminated wood (plywood) products. Yet, manufacturers and users...
A portable fiber-optic spectroscopic system (TRANSPEC) has been developed for nondestructive measurement of aged transformer insulating paper. Following successful measurement of degree of polymerization (DP) of a range of transformer-aged paper samples, the system has now been shown to separate the oil and paper information for measurement of DP in oil-wetted paper samples. In addition, the system...
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