Meeker 345 kilovolt (kV) Switchyard
HDR completed civil, physical and control design for a new 345 kV switchyard. The switchyard will help meet the region's growing electrical loads and service needs for area gas compression facilities.
The design accommodated build-out plans of a three bay breaker-and-a-half scheme with two transformer banks fed from the main bus. Built adjacent to an existing 345 kV transmission line, two line sections cut into the new switchyard and a third line position feeds a downstream transmission substation.
We were responsible for the transmission line tap design into the switchyard. The control design implemented an integrated supervisory control and data acquisition (SCADA) system. This reduced labor and installation costs by using fiber optic interface between yard equipment and control building devices. Control and status is achieved through communication channels rather than hard-wired connections. Human-machine interface (HMI) local indication and control capabilities all but alleviated control switches from the control panels. Site civil work included foundations and structural steel design, where grading and site drainage challenges due to location and terrain were overcome. The grounding design and calculations were accomplished using CDEGS (Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis) software.