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.
This paper discusses the design and evaluation of a +_ 250 KVDC submarine power c a b l e i n t e n d e d f o r i n s t a l l a t i o n i n 7 , 0 0 0 f e e t of water in the Alenuihaha Channel adjacent to the island of Hawaii. The successful completion of the evaluation and design i s an i n t e g r a l p a r t of any plans to link the major Hawaiian Islands i n t o a n e l e c t r i c a l g r i d . T h i s e l e c t r i c a l g r i d i s t h e k e y s t o n e t o t h e s t a t e of Hawaii's energy self-sufficiency program, which depends heavily on renewable energy sources such as ocean thermal, wind, and geothermal. The cable design work i s being performed as part of t h e Hawaiian E l e c t r i c Company Hawaii geep Water Electrical Transmission Cable Demons t r a t i o n Program, i n i t i a l l y funded by the state of Hawaii. Five candidate cable designs were selected for detailed analysis. These have been evaluated on t h e b a s i s of c o i l a b i l i t y / handleability , installability, survivability, c o s t , and t h e amount of development work required to ensure successful installation and operation of the cable.The preferred d e s i g n f o r t h e Hawaii Deep Water Cable uses a 2,700 kcmil aluminum conductor, mass-impregnated i n s u l a t i o n , l e a d s h e a t h , and a double layer of round jacketed g a l v a n i z e d s t e e l armor wire.
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