Third Line 115 kV Redevelopment

Selected Projects

Utility Substations

● CNP Fielden Substation Project
● Festival Hydro MTS-1 Project
● Gartshore 115kV TS Relocation
● HONI Aylmer Transmission Station
● HONI Cedar Transmission Station
● HONI Overbrook Transmission Station
● Rockwood MS #1 Project
● Third Line Redevelopment


Location: Sault Ste Marie, Ontario
Owner: Hydro One, Sault Ste. Marie LP
Contractor: EPTCON Ltd.
Engineer: OneLine Engineering

OneLine Engineering provided complete electrical engineering and design services for a new 115 kV (17 circuit breaker, 9 incoming overhead lines) transmission station required for the replacement of an existing station next to the new site. The scope of work included:

• Design of the protection relaying schemes for the line protection, transformer protection, teleprotection and bus protection, including detailed drawings required for assembly of the relay panels
• Production of all related electrical drawings including single line diagrams, AC & DC schematics, trip logic diagrams, cable and termination schedules, grounding and lighting layouts
• Equipment layout and building details for the switchyard control building
• RTU communications integration with the GLPT control center
• Revision to existing drawings as required for decommissioning of the existing circuit breakers and protection relaying systems
• Construction and commissioning assistance

OneLine Engineering is part of Cormorant Utility Services

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Selected Projects
High Voltage EPC Services

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