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    Waterproof cable and technical difficulties

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    Cross-linked polyethylene insulated (XLPE) submarine cable developed in the last century 80's, most for 220kV and below voltage level [1], its manufacturing and operating experience is far better than oil-filled submarine cable. Up to now, the highest-voltage XLPE AC submarine cable is the 2.2km long 420kV 4 single-seater submarine cable installed by NEXANS for the large OrmenLange gas field in the Norwegian Sea. 500kV AC long distance submarine cable, the current application of only oil-filled cable

    Compared with oil-filled cables, XLPE cables have the following advantages:

    ① XLPE cable is solid insulation, without the need for complex oil-filled system, do not need to detect oil level, control oil pressure, low operating costs;

    ② XLPE cable without lead jacket, bending radius is small, light weight, can be produced, laying longer length, and in the laying of installation and transportation should be more simple than the oil-filled cable;

    ③ XLPE submarine cable electrical performance and mechanical properties are also better than oil-filled cable. Because of this, XLPE insulated submarine cable development has a broader prospect