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Potential and limitation of dielectric response analysis for mechanically aged VPI insulation

This paper presents the results of a master thesis done at the University of Applied Sciences of Hannover. In this study generator bars are aged mechanically and the aging process is investigated with the dielectric response analysis. The results indicate changes in different types of polarization mechanisms. Due to the small amount of measuring equipment needed – this can be a first step towards a fundamental change in condition base maintenance of generators.