Evaluation of Thermal Stability of Nomex^® Brand Paper in Main Transformer of Shinkansen Train Series 100

Abstract

Nomex^® brand paper has been used as wire wrapping insulation material of main transformers of Shinkansen Train Series 100 with silicone oil. After approximately 12-13 years service, 8 transformers of Series 100 were sampled to evaluate degradation of Nomex^® brand paper in terms of tensile strength and intrinsic viscosity. All data were compared with initial data. The result of less degradation shows Nomex^® has good thermal stability in silicone oil in the main transformer of Shinkansen Train which were used in very severe condition.