The capacity of four parallel 69KV pipe type cable circuits was evaluated based on measurement of load and temperature data and thermal modelling. Summer normal and emergency ratings were lower than required. The altematives considered to achieve the rating increase are discussed. Increasing the usable capacity by implementation of a dynamic real-time rating system was recommended. The dynamic rating system, installed in 1997, has provided improved ratings which so far has deferred or possibly eliminated the need for circulation equipment. 0-7803-5515-6/99/$10.00 0 1999 IEEE
A methodology has been developed to assist in the technical evaluation of power transmission cable system installation and operational risks and the selection of a cable design for application in deep water installation situations.The methodology involves the evaluation of eight defirned technical selection criteria that provide either (1) an index of safety associated with various technical design aspects of a "Candidate" cable, or (2) an indication of the technological difficulty to manufacture, install, repair or operate each cable "Candidate." The cable selection methodology was developed to support the needs of a specific transmission cable application in Hawaii, but the methodology should be readily adaptable to other submarine power cable projects. * Normal operating voltage = +/-150 to 600 kVdc * Daily normal load swing = 200 to 500 MW.
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