Brittle Fracture of Composite Polymer Insulators: Service Experience and Research Findings

摘要

1. Acid is not the sole agent for brittle fracture, reactive H ions are more important 2. Acids are generated outside the insulator, not inside and transported via defects in housing/seals 3. Acid attack reduces the mechanical strength of rods significantly and dependent on (1) type of acid (2) glass type, resin and manufacturing quality 4. Screening tests in addition to the IEC 1109 can be proposed to evaluate and rank rods