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Kelso Gap Switch Station and Criterion Wind Farm Substation and Wind Park Collector System Design

Kelso Gap Switch Station and Criterion Wind Farm Substation and Wind Park Collector System Design

Oakland, Maryland

The Kelso Gap switching station and Criterion Wind Farm collector substation project is located in the Client’s transmission service territory. The Client had an existing 138kV transmission line between Parr Run and Albright substations that was in close proximity to the desired location of the Criterion Wind Farm. The Criterion Wind Farm is approximately 65 MW of generation and to meet the interconnect requirements of the Client, a switching station, Kelso Gap, was designed with a ring bus configuration to split the existing 138kV transmission line between Parr Run and Albright substations.

The Kelso Gap switching station’s primary system is of a typical ring bus configuration; however, complex protection and SCADA system designs needed to be negotiated. The design entailed powerline carrier, coupled with direct transfer trip schemes, to prevent islanding of the wind farm in the event of a system disturbance to the transmission.

The Criterion collector substation is a typical wind park collector system design with a 100 MVA transformer, 138kV delta highside and 34.5kV gnd-wye lowside step up transformer. To save the client(s) on capital investments, the 34.5kV feeders exiting Criterion collector substation were designed with 34.5kV grounding breakers, which are recognized as revolutionary devices in the wind industry. Realtime Utility Engineers provided additional value by using standard design drawings from existing templates, thus enabling a substantial cost savings to the client(s). Realtime also provided system studies including short circuit, arc flash, and insulation coordination, as well as provided an optimized design of the underground collector system. Similarly, Realtime also designed the SCADA and metering system with web based HMI (Human Machine Interface) capabilities, enabling the client to view and monitor the substation from virtually any location in the world using a common PC.