RIP Bushing Service Experience & Replacement Strategy in TNB by Gobi Kannan Supramaniam

Failure statistics show that bushings are a main contributor to transformer failure and can have a potentially catastrophic impact on system reliability and safety. Despite industry efforts to proactively implement more condition-based maintenance to detect impending failures, migration to a safer dry bushing was deemed necessary at one large TSO to manage impact and risk linked to conventional oil-based bushing technology. The presentation shares that grid’s practical experience and lessons learned during this migration process and also details related improvements in specifications and procedures.