HONI Aylmer Transmission Station
115 kV DESN Substation Replacement Project

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: Aylmer, Ontario
Owner: Hydro One Networks Inc.
Contractor: EPTCON Ltd.
Engineer: OneLine Engineering

OneLine Engineering is providing complete electrical engineering and design services for the replacement of an existing 115 kV DESN yard with a new DESN station located on the same site. All work is based on the latest HONI design standards. The scope of work includes:

• Design of the protection relaying schemes for the line protection, transformer protection, teleprotection, bus protection and feeder protection, including the detailed drawings required for assembly of the relay panels
• Production of all related electrical drawings including single line diagrams, AC & DC schematics, connection wiring diagrams, cable schedules, grounding and lighting layouts
• Power cable sizing and installation details
• RTU communications integration and network design
• Cable trench layouts and details
• Design of a new PCMT building and GIS switchgear building, including cable tray and equipment layout
• Review of GIS switchgear vendor drawings
• Construction and commissioning assistance

OneLine Engineering is part of Cormorant Utility Services

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Selected Projects
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