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This document discusses two case studies related to electrical grid substations: 1) Damage of porcelain disc insulators on a 220kV transmission line was found to be caused by high tower footing resistance, allowing voltage buildup during lightning strikes and causing flashovers that weakened the insulator discs. Improving grounding reduced further failures. 2) Failure of two 33kV live tank current transformers during rain was found to be due to design issues, like loose connections and stress points, th

Author

Izhar Ahmed Noohpoto

Language

EN