South Cummings 69 kV – 12 kV Substation Upgrade
Design of (6) position, 69 kV ring bus, (2)-30/40/60 MVA power transformers, (2)-15 kV reactor system, and a 3000 amp Main-tie-Main switch station with (10)- 1200 amp breakers. The project integrates (2) existing 16/24/32 MVA units (fed 69 kV radially) and a similar switch station. This project provided a 12 kV line-up (in an existing building), geotechnical and soil work, fault analysis and current limitation design, a full complement of SCADA and protective relaying, transformer differential, and paralleling schemes for four transformers. This project integrates a new 12 kV system upgrade into an existing system.
