Switching Station Design

Switching Station Design

Northeast Utility

Commonwealth was selected to be the Contract Engineer and provide design services for a new switching station for a Northeast utility. Commonwealth provided an entire design for a 115 kV three-positioning bus switching station that is convertible to a three-bay, breaker-and-a-half switching station in the future. The design included preliminary, review, and construction packages.

Commonwealth provided design documents, including detailed station drawings, a grounding report, lighting and lightning studies, AC studies, battery calculations, and analytical report documents that provided the necessary calculations for all civil/structural aspects of the design. Commonwealth also provided conduit fill calculations, voltage drop calculations, and logic and protection settings files for all new Protection and Control (P&C) relays. The implementation of the IEC 61850 automation system at the switching station was the first time the Commonwealth P&C Engineering team had designed a communication system using the IEC 61850 standard protocol.

Commonwealth provided procurement support and prepared bidder specifications for the new control enclosure and cabinets. Commonwealth also provided construction support by reviewing and commenting on all technical submittals from the installation contractors.

The installation met the client’s expectations, the work was completed successfully, and the project was energized on March 9, 2017, as planned.

This solution was implemented in the following market(s):

The location of the site and bedrock conditions lead to specific design and construction challenges, including the access roadway.

Mark McEldowney, P.E.
Section Manager

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