XLPE insulated fibre-optic composite AC submarine cable with voltage 500 kV or belowApplicable to offshore wind power, offshore photovoltaic, island power interconnection and other marine power transmission fields, voltage level 500 kV and below, conductor cross-section 3000mm2 and below, transmission capacity 1.5 GW and below, 500 kV single-core, three-core crosslinked polyethylene-insulated AC submarine cables, and other products have passed the national new product identification, and the comprehensive technical performance has reached the international leading level.