A rated
voltage of 35kv or below
shallow sea wind farm photoelectrical transmission composite cable comprises a cable core provided with a lead and a water-blocking filling piece, a water-blocking belting layer, a plastic-aluminum composite band layer, an internal sheath, a wire armoring layer and an external sheath, wherein the cable core are externally coated with the water-blocking belting layer, the plastic-aluminum composite band layer, the internal sheath, the wire armoring layer and the external sheath in turn, the cable core is internally provided with a
fiber optic
communication unit, a steel-tape armoring layer is arranged between the external sheath and the wire armoring layer. The structure of the
fiber optic
communication unit is as follows: a
fiber loose tube is externally coated with an internal sheathing layer, an armoring layer and an external sheathing layer in turn. A conductor of the lead adopts two-tier structure: a
central layer conductor is formed by twisting multiple stranded
brass wires coated with water-blocking balm, and then coats a
central layer semiconductive water-blocking band layer; an external layer conductor is coated outside the
central layer semiconductive water-blocking band layer by multiple stranded
brass wires coated with water-blocking balm, and then coats an external layer semiconductive water-blocking band layer. The invention has the complex function of
optical communication and
power transmission, one cable has two uses, thereby saving cost and facilitating laying; in addition, the cable has high strength, excellent
wear resistance,
corrosion resistance and waterproof function, and can adapt to the requirement for
subsea use in long term.