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Princeton University Substation & Electrical
Upgrade Project
February 28, 2019
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Project Background
► Princeton University connected to PSE&G at 26kV in two locations
• Elm Substation
• Charlton Substation
► 2018 Peak Load ~28 MW
• Gas Turbine Generator
• Solar
► PSE&G 26kV overhead distribution is at capacity
• Future campus expansion limitation
• Overhead distribution exposure
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Design Goals
► Support Campus Expansion
• Increase electrical capacity
• Lake Campus, etc.
► Support Campus Goals
• Sustainability
• Redundancy – N+1
• Reliability
• Resiliency
• Maintainability
• Improve Campus Voltage Regulation
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Project Scope
► Construct new 69kV Substation (69kV – 26.4kV)
• Greater reliability at 69kV transmission vs. 26kV Utility O/H distribution system
► Reconfigure Charlton & Elm Substations to be served from new Princeton
Substation
• Overhead -> Underground Service
► Elm Substation Upgrades
• Two new 12/16/20 MVA transformers
• New 5kV switchgear
► Replace 5kV Switchgear at Dillon Gym
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Project Team
► Princeton University
• Technical & Operations Team
• Construction Management & Project Management
• Civil Construction
► Burns & McDonnell
• Electrical
• Structural
• Communications/SCADA/Automation
• HDD Design (Brierley)
► Van-Note Harvey
• Civil Engineering/Local Codes
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69kV Substation
► Location• Adjacent to existing PSE&G Station
• Coordinated with expansion
► Ring Bus Design• High reliability
► Three 69kV transmission system connections• Geographically distinct
► Two 69kV:26kV 50/67/83 MVA transformers• 2-hour fire-rated separation wall
• Oil containment
• LTC – 26kV Voltage Regulators
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69kV Substation
► 69kV Relay/Control House – University Owned
• Utility Controlled 69kV Pass-Thru Yard (2 x 69kV Lines)
• Future (3 x 69kV Lines)
► Two 26kV Switchgear Buildings - University Owned/Controlled
• Main-Tie-Tie-Main
• Relay & Synchronizing Panel
► Future Telecom Entrance Point
► Backup Generator
► Aesthetic Considerations
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Horizontal Directional Drill
►Two 2000’ bores – 60’
deep
►36” Diameter Holes
►26kV - A & B Feeders
►Telecom
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Elm Substation
► 26kV Service to new
substation
• Utility ->Owner-served
► Upgrade transformers
• 12/16/20 MVA
► Replace 5kV Switchgear
► Synchronizing Panel
► Construction Phasing
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Charlton Substation
► 26kV Service from new
substation
• Utility ->Owner-served
► Protective Relaying Upgrades
► Coordination of Utility Outage
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Project Schedule
► 69kV Substation Energization: April 1st, 2019
► Charlton Substation Cut-Over: June 2019
► Elm Substation Cut-Over: Fall 2019
► Substantial Completion: Fall 2019
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Considerations and Project Applications
► Utility Coordination – Early and Often!
► Aesthetics and Site Location
► Factory Equipment Testing
► Load Growth
• Integration with Utility Master Plan
► Underground Utilities
• Close coordination with Princeton
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