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Failure behavior of high performance porcelain insulators

The present study aims to contribute a better understanding on the aging mechanisms of alumina porcelain long‐rod insulators and provides the fundamentals for a life‐time‐model. Two different approaches are taken: On one hand long‐rod insulators are investigated in a tensile test, after their use in high voltage grids, concerning a potential reduction in strength over their lifetime. On the other hand mechanical properties of glazed and unglazed C130 alumina porcelain are determined in a four‐point‐bending test.