On the XYZ sub-station board, we are unable at present to meet the requirement of 1200 amperes per phase to operate the new plant using the existing Oil Circuit Breakers (OCBs). Because OCBs spares are not available, the old equipment cannot be uprated.
We therefore suggest replacement of some OCBs of the existing switchgear with new Vacuum Circuit Breakers (VCBs).
This proposal is presented below…
