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In order to investigate the thermal aging characteristics of oil-paper insulation in opentype transformers, a thermally accelerated aging experiment with flowing dry air is performed. The vegetable oil, NOMEX paper, pressboard, copper and silicon steel are sealed into the aging vessels and further aged, for 216 hours, by supply of flowing dry air at 170 °C. Several important parameters associated...
The accelerated thermal aging test with controlled air was performed at 170°C for 216 hours, using the oil-paper insulation samples which were composed of BIOTEMP oil, NOMEX paper and pressboard. Some aging indicators including degree of polymerization of pressboard, dielectric strength of oil, acid value of oil, furfural concentration of oil, and water content, etc, were measured and recorded during...
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