628results about "Submarine cables" patented technology

In an umbilical, one or more steel rods, which provide strength and ballast, are wound helically within the umbilical along with the steel tubes and/or elongated active umbilical elements. These steel rods replace some or all of the thermoplastic filler elements that would otherwise be included within the umbilical. An umbilical according to an embodiment of the invention may include a plurality of steel tubes helically wound around a core, and at least one substantially solid steel rod helically wound around the core, the steel rod being arranged in a void between the steel tubes. Thus, the invention avoids the need to apply additional armoring layers to the outside of the umbilical for strength and ballast.

An electric power transmission cable includes at least one first section provided with cable armour made of a first metallic material, and at least one second section provided with a cable armour made of a second metallic material, wherein the second metallic material has ferromagnetic properties substantially lower than those of the first metallic material.

A preparation method of a deep sea cable filling strip relates to a preparation method of a conductor filling strip. The preparation method comprises the following process steps: mixing rubber, a vulcanizing agent, a vulcanization accelerator, an antiager, a plasticizer, a reinforcing filler and a tackifier in parts by weight; and then calendering, slitting and packaging to obtain the finished product. The method has a simple production technology, stable technical properties and high practicability; the product is used in the cable and the cable core of the optical cable, the product has high strength, uniform thickness and a good saturated water absorption effect and has the functions of shielding and buffering the electric field; and the product also has viscoelasticity, thus the filling cable core is stronger and the service life of the optical cable can be prolonged.

Compact bidirectional repeaters are provided for wireless communication systems. Their compact size is realized with repeater structures that include different-polarization antennas, back lobe suppressing structures, circuit feedback paths, antenna-feedback detectors, and automatic gain control.

A solid cable provided with an insulation layer on the outer circumference of a conductor, and impregnated with insulating oil in this insulation layer. Medium-viscosity insulating oil the viscosity of which is between not less than 10 cst and less than 500 cst at 60° C. is used as the insulating oil.

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.

The invention relates to a sea electric power cable which comprises a conductor (1), semi-conduction layer (2), insulation layer (3), a buffer layer (4), a lead casing (5), an inner jacket layer (6), an armor layer (7) and an armored outer protective layer (8) which are arranged from inside to outside. The invention is characterized in that the inner jacket layer (6) is a mixed layer formed by the end-to-end connection of the semi-conduction layer and the insulation layer in series. Compared with the prior art, the armored inner jacket layer adopted by the invention is the mixed layer formed by the end-to-end connection of semi-conduction layer and insulation layer in series. Such design has the advantage that the underwater portion and the onshore portion of the sea electric power cable comprise different inner jacket layers, wherein the underwater portion is an anticorrosive semi-conduction layer, thereby effectively solving the problem of induced potential, and further solving the problem of circular current; and the onshore portion is an insulation layer which is the same structure as the common electric power cable, thereby realizing cross interconnection, and further achieving the purposes of reducing loss and raising current capacity.

An electric power sea cable including at least one cable core. The cable core includes an electric conductor, an electric insulation surrounding the conductor, and a protective sheath surrounding the electric insulation and acting as a water barrier. At least one outer layer surrounds the at least one cable core. The protective sheath is made of metal and the electrical power sea cable includes at least one friction reducing layer surrounding the at least one cable core and arranged inside of the at least one outer layer.

An electrical conductor for transmission of electrical power, having a total cross-section equal to or above 10 mm² and comprising a plurality of stranded filamentary members, where at least one of the filamentary members is made from microalloyed copper or microalloyed aluminium having annealing temperatures higher than 250° C., and has the side surface thereof totally coated with a fluorinated polymer. The conductor has a better behavior relative to the skin effect and allows operation at high temperatures. Furthermore, if the electrical conductor is suspended, it has a smaller sag and prevents or reduces the accumulation of ice and/or snow.

The invention discloses a photoelectric composite submarine cable, which comprises a photoelectric composite module which is axially arranged, two waterproof layers which are axially overlapped on the periphery of the photoelectric composite module, a liner layer which is axially sleeved on the periphery of the waterproof layer, an armoring layer which is axially sleeved outside the liner layer and an outer coat layer which is axially sleeved outside the armoring layer. The photoelectric composite submarine cable can overcome the weaknesses of the prior art that the waterproof performance is poor, the corrosion resistance is poor, the tensile resistance is poor, the cost is high, the installation and pavement difficulty is large and the like, and has the advantages that the waterproof performance is good, the corrosion resistance is good, the tensile resistance is good, the cost is low, and the difficulty in installation and pavement is small.

The present inventions relate generally to umbilicals comprising at least one inner tube and at least one composite fiber element to provide greater resistance to radial compressive forces. Such umbilicals may be used in subsea hydrocarbon production applications.

The invention discloses a submarine optical fiber composite high-voltage cable with a detection function. The cable comprises cable cores, an inner armor layer and an outer armor layer, wherein the inner armor layer is twisted on the cable cores; the outer armor layer is twisted on the inner armor layer; an outer sheath is formed on the outer armor layer by extrusion molding; an optical fiber sensor unit is arranged in a gap of the cable cores of the cable for measuring the temperature of the cable; and a bedding layer is arranged between the inner armor layer and the outer armor layer and an optical fiber sensor unit is distributed between the inner armor layer and the outer armor layer for detecting damage of the cable. A natural characteristic that transmission loss is increased when the optical fiber is used for bearing bending or transverse pressure is used, the damage of the cable can be detected, and accurate positioning can be realized through an instrument. The optical fiber sensor in the cable cores is used for measuring the temperature variation of the cable core of power cables.

An electrical cable protected against moisture by a tubular liquid crystal film having its molecules multiaxially oriented.

The invention belongs to the technical field of a cable, and relates to a photoelectric composite cable laid in a seabed. The cable comprises multiple fibers, a loose sleeve, a thermal insulation layer, a conductor layer, an insulation layer, a shielding layer, a first protective layer, an inner sheath, a first armored layer, a second protective layer, a second armored layer, a third protective layer and an outer jacket. The first armored layer is formed by spirally twisting first reinforcement elements around the inner sheath in a unidirectional mode by a first pitch; the second armored layer is formed by spirally twisting second reinforcement elements around the second protective layer in a unidirectional mode by a second pitch; the winding directions of the first pitch and the second pitch are opposite; the second pitch is 3 to 5 times the first pitch; the ratio of the first pitch to the external diameter of the inner sheath equals to (3-6):1; the materials of the first reinforcement elements are steel wires or alloy wires; and the materials of the second reinforcement elements are the steel wires or the alloy wires. The cable provided by the invention has the following advantages: the cable can transmit both optical signals and electric power, can also resist bending and torsion, and is more compact in structure, longer in life, smaller in external diameter, lower in cost and lower in transport cost.

The invention relates to a flexible electrical elongated device, suitable for service in a high mechanical load environment, wherein said device has a longitudinal axis, and comprises: at least one elongated electrical conductor element, an elongated load bearing component along said longitudinal axis and having an external surface including at least one groove disposed along said longitudinal axis, said groove being designed for holding said conductor element within it while allowing said conductor element to move substantially radially when said device is bent.