132kV Breaker Rebuild

Summary

LTB145 D1/B was serviced during routine a maintenance period and test results produced a high contact resistance in one of the poles. A workshop overhaul was recommended and took place at the HES workshop.

Solution

The CB was fixed to a floor mount specifically designed for this type of CB and the SF6 gas was recovered. All parts were disassembled and inspected. During inspections it was noted that the surface where the O rings maintain the SF6 gas seal had tarnished, these critical surfaces were lightly skimmed via a CMC machine, all contact surfaces were cleaned, regreased and resealed with new O rings. All final test after rebuild were within OEM tolerance.

BEFORE