VANALCO SWITCHYARD
Vancouver, Washington

OWNER—VANALCO
Vancouver, Washington

TriAxis provided transmission lines and switching station design for a large industrial facility owned by VANALCO. This project consisted of a new 115-kV transmission source and a 13.8-kV distribution source to an existing industrial facility. The project was designed to replace two existing high-capacity 13.8-kV feeds to the facility.

Design features included:

• An eight position 115-kV 420 MVA capacity ring bus with two incoming overhead line positions and six underground 115-kV feeder positions.
• A 2000-amp bus design with 63kA rated circuit breakers.
• Primary and backup bus differential schemes for each of eight positions. Backup over-current relaying on feeder positions.
• High speed pre-trip signaling to each of the 115-kV feeder loads.
• All switching station relays have communications between relays and plant PLC system.
• Relaying included a complex load shed scheme with multiple feed and configuration scenarios.