Please take note that this RMU is continuing to operate after the incident up to this day. Interrupting medium of transformer feeder breaker is vacuum but surrounded by SF6. Busbar and 2 incomer line feeder switches are immersed in SF6 also.
Recently, we noticed 2 bolts of our 12kV Ring Main Unit switchgear enclosure were totally burned that left 2 empty burned holes. Also, we found that the earthing/grounding connection of the switchgear and the 3 core power cable armor was missing. Additionally, a fault occured along the line...
