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Tuesday, February 22, 2011

Root Cause Analysis: Stuck-up Worm Gear for Spring Charge Mechanism of 69kV Power Circuit Breaker (part 2)

This is the continuation of my previous post. We did some extreme measures but after re-energization of the line, it was worth it.
II. ACTIONS TAKEN
1. At 1750H, temporarily bypassed the Power circuit breaker 1 so that the line could be energized.

Root Cause Analysis: Stuck-up Worm Gear for Spring Charge Mechanism of 69kV Power Circuit Breaker

I would like to share the substation equipment trouble that happened in our substation last February 15, 2011. We conducted maintenance on 69kV breaker and during energization of the line, the breaker failed to close after series of attempts. After series of troubleshooting, we found that the worm gear for spring charge mechanism was stuck on its bushing. Below is the full text of my report: