Cape Coral 138 KV Transmission

Description of Project

LCEC 138 KV UG Transmission Conversion 138 KV Transmission  Underground Design-Build project consisted of relocation from overhead to underground facilities though the Future City Center Improvement area of Cape Coral Florida for a distance of approximately 4,500’ of concrete encased  transmission duct-bank, designed for the EMF and Temperature dissipation required for the 138KV voltage and load required, design and installation of (3) 12’ x 28’ underground vaults set to depths of 20 feet below grade and engineered to withstand the 60,000 lb pulling tensions of the 4000 KCMIL copper transmission cable. Also incorporated into the project was the foundation and structure construction of the substation entry switch towers and pole riser. Temperature of the system is monitored through the fiber optic path along the cable through an integrated Thermal Sensing and Logging instrument provided within the project in the Substation. Hypower served as Representative in support of LCEC through the arduous Scope/Path Clarification, Budget Consideration, Bid Letting, subsequent Evaluation Process with the City Leaders and then ultimately as Project Manager throughout the Design and Construction Processes. Design tasks included Geothermal Evaluation, Utility mapping and Survey, Duct Bank Design, Manhole Design, Cable Design, Substation Riser Switch and Lighting Arrestor Design, Duct Spacer Design, Concrete Mix Design, Conduit Sweep Design, Pole Riser Equipment Placement Design Support and Large Utility Crossing Mitigation Plans. Detailed calculations were performed to derive the duct bank depths allowed and exact spacing and configuration of the transmission lines addressing temperature dissipation and EMF leading to the development of project specific duct spacers.