The project required the removal and discarding of one spare phase of an existing 138 kV oil filled submarine power cable and the installation of a new circuit of three-core, double armoured, 69kV XLPE submarine cable in its place with ancillary equipment, accessories, and integrated communication fiber for a fully functional cable system in the Stikine crossing. This crossing is approximately 17,400 feet (5,300 m) long and a maximum water depth of about 700 feet (215 m) between
This project was awarded to
Upon commencement of the contract,
The removal work and installation work were performed back-to-back in one single campaign during the summer of 2021, while the existing oil-filled cable transmission line were energized and in operation.
This project epitomizes the virtues of Sumitomo's corporate philosophy by introducing new technology with emphasis on more environmental friendly products and processes. An oil-free and maintenance-free new 69 kV submarine XLPE cable three-core cable was installed, whilst virtually using the same footprint of the replaced cable. This was achieved by totally reclaiming instead of abandoning one spare phase of old oil filled cable from the existing circuit. The installation of a new high voltage circuit allows the erstwhile circuit to be kept as a backup in case of emergencies, provides superior double armour protection against extreme Alaskan environments and provides a pathway for future expansion of broadband fiber networks.
The success of this project holds great promise for the acceleration in the renewal of similar aging submarine transmission lines which are common on the
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