77 results about "Submarine power cable" patented technology

A system and method for coupling electrical power subsea. The system comprises a subsea electrical distribution system having at least one subsea circuit breaker assembly. The subsea circuit breaker assembly comprises a modular subsea busbar assembly configured to receive a plurality of modular cubsea circuit breaker assemblies and at least one modular subsea circuit breaker assembly secured to the modular subsea busbar assembly. The modular subsea circuit breaker assemblies may be coupled by subsea power cables to a source or power, an electrical load, or other subsea circuit breaker assemblies.

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.

A method of detecting a fault in a subsea power cable or in a direct electric heating system including a subsea power cable is provided. Measuring points are distributed along the subsea power cable. The method includes measuring at each measuring point a current in the subsea power cable and comparing the currents measured at the different measuring points.

There is described a method for controlling the output of a tidal hydroelectric turbine generator from a remote location, with the need for control circuitry to be housed local to the generator. The rotational speed of the turbine, and consequently the output power level of the generator, is controlled by varying the transmission line voltage of the submarine power cable connecting the off-shore turbine with an on-shore substation.

A self-propelled, robotic power generating system remains submerged in deep water areas, tethered within steady-state, generally unidirectional sea currents in non-tidal areas for the continuous production of turbine-generated electricity that is transmittable by multipurpose undersea power cable to onshore electric grids. System aspects include a shore-to-system communication means to remotely manage all system functions; a sea current intake consisting of a cone-like, retractable current amplifier to significantly increase the energy density of the currents passing through the amplifier to the turbine; a self propulsion means to move the system to maintain a desirable location within a prescribed area that may be subject to meandering currents; a snorkel-like vertical air conduit for ballast control; a seawater pumping means for ballast control; a retractable marine wildlife protector to cover the sea current intake; and a remotely retractable anchor means to maintain the generating system in a target position for extended time periods.

The invention discloses a high voltage and supervoltage cross-linked polyethylene insulating submarine power cable with a single core. A metal shielding layer (8) of the cable is a lead sleeve shielding layer; and a copper wire sparse winding shielding (6), which is formed by copper wire leads, is arranged between a first semiconduction water blocking buffer layer (5) and the metal shielding layer (8). And a metal armor layer is composed of nonmagnetic non-ferrous metals. According to the invention, the cable has a good mechanical property and a good corrosion resistant performance; electromagnetic losses are small; and there is enough transient and short-circuit current capacity. Therefore, the cable provided in the invention is suitable for replacing a high voltage and supervoltage AC transmission oil impregnated paper insulating submarine power cable with a single core as well as can be laid in an adverse marine usage environment; moreover, the cable has good mechanical and applicable performances.

A system for coupling electrical power subsea. The system comprises a subsea electrical distribution system having at least one modular circuit breaker assembly. The modular circuit breaker assembly may receive power from one or both of a subsea AC power cable and a subsea DC power cable. If power is lost from one subsea power cable, the modular circuit breaker assembly enables power to be provided to subsea loads from the other subsea power cable. The system comprises a subsea motor operable to drive a subsea pump or compressor.

An electric submarine power cable, in particular for use in hydrocarbon pipeline heating systems and adapted to be installed as a piggyback cable on the pipelines, having a multi-wire stranded conductive core with an outer insulation and at least one outer protective sheath as well as armoring means. The armoring means are incorporated in the conductive core as integral tensile strength wire elements. Moreover, a hydrocarbon pipeline heating system as such, having this submarine power cable.

A direct electric heating (DEH) system for heating a subsea pipeline is provided. The DEH system includes a subsea power cable adapted to be coupled to a three phase electric power source. The DEH system further includes two or more subsea DEH modules. Each subsea module of the two or more subsea DEH modules is provided for heating a different pipeline section of the subsea pipeline.

A system and method for coupling electrical power subsea. The system comprises a subsea electrical distribution system having at least one modular subsea circuit breaker assembly. The modular subsea circuit breaker assembly may be coupled to sources of power and/or subsea loads via one or more subsea power cable harness assemblies. The modular subsea circuit breaker assembly has at least electrical connector. Each subsea power cable harness assembly has a corresponding electrical connector. At least one of these electrical connectors is extendable to engage an electrical connector opposite it.

This invention is directed to an electromagnetically shielded subsea power cable containing at least one conductor, an electromagnetic shielding layer wrapped around each conductor, an insulation layer wrapped around each electromagnetic shielding layer, and a metallic shielding layer wrapped around each insulation layer. The subsea power cable can be used to transport power from a power source to a power user located subsea or at an intermediate facility, such as a platform.

The invention provides a method and system for detecting reliability of a submarine power cable. The method for detecting reliability of the submarine power cable comprises the steps of obtain specific fault characteristics of the submarine power cable through analysis of historical fault data of the submarine power cable, carrying out analysis to obtain fault factors of the submarine power cable according to the specific fault characteristics, building a submarine power cable fault tree model, obtaining the corresponding relation between a top event and bottom events in the submarine power cable fault tree model, and carrying out reliability detection according to operation condition parameters of the submarine power cable and the corresponding relation between the top event and the bottom events in the submarine power cable fault tree model. In the whole process of reliability detection, the specific fault characteristics of the submarine power cable are fully taken into consideration, a fault tree analysis method is adopted, it is ensured that the built submarine power cable fault tree model is accurate, and accuracy of reliability detection is ensured.

The invention provides a full-water-blocking sea power cable which sequentially comprises a twisted conductor, a semi-conducting water blocking belt, a conductor shielding layer, an insulating layer, an insulating shielding layer, a lead sleeve, a non-metal sheath, an anti-corrosion layer, a steel wire armoring layer and an outer covering layer from inside to outside. Electricity-conducting sealing glue is filling in gaps of the twisted conductor, the sealing glue is prepared by mixing butyl rubber and carbon black, and a semi-conducting buffer layer for blocking water is arranged between the insulating shielding layer and the lead sleeve. The sea power cable can achieve effective and reliable longitudinal water blocking.

The invention relates to a photoelectric combined submarine power cable which comprises a cable core (1), a shielding layer (2), an insulating layer (3), an insulator shielding layer and internal protecting layer (4), an armored inner liner layer (5), an armored layer (6) and an armored outer protective layer (7). An optical fiber unit (A) is formed by sequentially arranging the cable core (1), the shielding layer (2), the insulating layer (3) and the insulator shielding layer and internal protecting layer (4) from interior to exterior, and three groups of optical fiber units (A) are mutually stacked together. The photoelectric combined submarine power cable is characterized in that the cable core (1) comprises a steel wire lead and an aluminum lead, wherein the steel wire lead is arranged in the center of the aluminum lead, and the steel wire lead and the aluminum lead are jointly twisted into the cable core (1) in a steel core aluminum twisted wire structure. Compared with the prior art, the structure has the advantages that the cost is saved by substituting aluminum for copper, the conductivity fully meets the standard, and the twisted wire of the steel wire lead and the aluminum lead can solve the problem of poor tensile strength of the aluminum lead. The power cable has decreased production cost and has the conductivity and the tensile strength both meeting the stipulated standard.

The invention discloses a device and a method of quickly positioning a local discharging part of a submarine power cable. The device comprises a high-voltage pulse generator, a towed linear array sonar, an ROV and a water mobile platform, wherein the high-voltage pulse generator is serially connected onto the connection place of the submarine power cable; the water mobile platform is provided with a monitoring center, an acoustic beacon positioning device, and a satellite positioning device; the monitoring center is respectively connected with the acoustic beacon positioning device, the satellite positioning device, a communication device, the towed linear array sonar and the ROV; and an optical imaging device, a sonar array, a manipulator and an acoustic beacon are arranged on the ROV. The general location of a suspected discharging part is determined through the towed linear array, arrival confirmation is carried out with the help of the ROV, accurate and quick positioning of the local discharging part is realized, the submarine power cable structure is lowly required, the adaptability is strong, support from a composite cable technology is not needed, and the submarine power cable construction cost is reduced.

The invention discloses a fixed flange assembly which is arranged at an end portion of a submarine power cable ascending from the seabed to the land, and particularly relates to a transformation tower or an offshore iron tower, before checking manhole connection with the submarine power cable, the submarine power cable is fixed, sea side pulling and vibration transmitted through the submarine power cable are cut off, ground connection is further carried out, after ground connection and terminal leather peeling of the submarine power cable, a curved face of an exposed armour wire form a fixed flange, the fixed flange bends backwards at the same curvature radius for fixing, the ground contact area can be improved, the folded armour wire is fixed by a clamp, endurance of the connection portion is reinforced to improve ground connection efficiency and shorten the construction time, the upper portion flange and the lower portion flange are respectively cut off in upper and lower directions, and the fixed flange assembly has a left side portion and a right side portion which can be easily separated or bonded. The invention further relates to a construction method for the fixed flange assembly.

The invention discloses a 500kV cross-linked polyethylene insulated submarine power cable, which comprises a water-blocking conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a water-blocking tape wrapping layer, a metal sheath, a polyethylene sheath, and armor layer and outer sheath; a conductor shielding layer is arranged outside the water-blocking conductor, an insulating layer is arranged outside the conductor shielding layer, an insulating shielding layer is arranged outside the insulating layer, and a water-blocking tape wrapping layer is arranged outside the insulating shielding layer A metal sheath is arranged outside the wrapping layer of the water blocking tape, a polyethylene sheath is arranged outside the metal sheath, an armored layer is arranged outside the polyethylene sheath, and an outer sheath is arranged outside the armored layer. The power cable of the present invention has the advantages of large transmission carrying capacity, low dielectric loss, low production cost, and convenient operation and maintenance. It leads the technological innovation of the world's cable industry, complies with the national resource development strategy, and meets the needs of national energy construction safety. have a profound impact on my country's economic development.

The invention discloses a rubber mold for manufacturing factory joints of submarine electric power cables. The rubber mold comprises an upper mold and a lower mold which are semi-cylinder-shaped, wherein the upper mold and the lower mold are butted to form a cable insulating recovery area; the diameter of the middle part of the cable insulating recovery area is larger than those of the two end parts; and the diameters of the two end parts are slightly larger than that of a cable; and injection-molding holes are arranged on the top part of the upper mold along the radial direction. The invention also discloses a method for manufacturing the factory joints of the submarine electric power cables. The method comprises the following steps of: installing the rubber mold, installing a metal injection-molding mold, injecting an insulating body material, cooling and disassembling the mold, finishing an insulating layer, carrying out high-temperature and high-pressure vulcanization and carryingout cooling and forming. The invention has the advantages that the problem of middle connection in the process of producing the submarine cables is solved, and the large-length supplying requirement is met; due to adoption of the hydrogenated-nitrile rubber mold, the problem that the performances of other materials are difficult for meeting the requirement is solved; the adopted process solves the recovery of the insulating layer and a shielding layer at the factory joint parts of the submarine cables, and the insulating performance meets the requirement of normal operation of the cables completely.

An cable that is flexible and watertight by means of a metallic water resistant barrier has at least two protective layers 20, 30 of metal tape wound to a cable core 10 with small gaps 50 between each turn of the tape, and where each layer is displaced 50% relative to each other thus covering the gaps in the layers 20, 30, and where the gaps 50 are filled with a water resistant material.

The present invention relates to an electrical power transmission system (100) which utilizes HVDC technology to supply power over long distance to an underwater system (130) such as a modular seabed processing system (300). The system (100) comprises a host station (110), a remote power conversion facility (120) and an Integrated Service Umbilical (150) which is connected to the underwater system (130). The host station (110) transmits DC power through a submarine power cable (140) to the remote power conversion facility (120) which is more than 100 km from the host station (110). Thereon, the remote power conversion facility (120) which includes a DC to AC inverter (123), a transformer (122) and a local control station (121), converts the DC power to the required AC power for the underwater system (130). The operation of the transmission of power to the underwater system (130) is monitored and controlled through a master local control station (111) at the host station (110) and/or a local control station (121) on the remote power conversion facility (120). Advantageously, electrical power may be supplied to an underwater system (130) which is more than 100 km from a power source. In addition, the underwater system (130) and the power transmitted can be remotely monitored and controlled.

The invention discloses a power supply device for seafloor power cable failure diagnosis capable of generating electricity through temperature difference. The power supply device for seafloor power cable failure diagnosis capable of generating electricity through temperature difference comprises a heat transmission layer, heat insulating layers, five temperature difference generating slices, a fixing ring, a heat dissipation layer and a stabilized voltage supply encapsulated circuit. The five temperature difference generating slices and one face of the stabilized voltage supply encapsulated circuit are respectively pasted on one side face of the heat transmission layer, the other faces of the five temperature difference generating slices and the stabilized voltage supply encapsulated circuit are respectively pasted with the heat dissipation layers, and the heat insulation layers are arranged between two adjacent temperature difference generating slices and between the temperature difference generating slices and the stabilized voltage supply encapsulated circuit. The temperature difference generating slices, the heat dissipation slice and the stabilized voltage supply encapsulated circuit are fixed through fixed rings. The five temperature difference generating slices are connected in series in sequence and two ends of the temperature difference generating slices are connected with the stabilized voltage supply encapsulated circuit. The power supply device for seafloor power cable failure diagnosis is capable of generating electricity through temperature difference and has the advantages of being small in size, simple in installation and maintenance work, low in cost and good in reliability of arrangement working.

The invention discloses a simple method for calculating the short-term maximum allowable overload current of a submarine electric power cable, and relates to an overload current calculating method. An existing method of calculating the short-term maximum allowable overload current of a cable refers to standards, needs plenty of parameters and complex formulas, is complex in calculation process, and can hardly provide an accurate result within a short period of time. The method includes the following steps of obtaining environment parameters, obtaining structural parameters and electrical parameters of a submarine cable body, obtaining an initial current value I1 of the submarine cable through online monitoring, calculating the initial temperature of a conductor according to the IEC 60287 standard formula, obtaining the short-term overload time tm according to an overhaul or schedule instruction, and calculating the maximum allowable overload current I2 within the short-term overload time tm through the formula (please see the formula in the specification) when the short-term overload time tm is smaller than set time. According to the technical scheme, few parameters are required for calculation, and the calculation process is easy, convenient and rapid. The shorter the overload time of the submarine cable is, the higher the reliability of the calculation result is.