1533 results about "Submarine cable" patented technology

The invention discloses a nontoxic antifouling paint for an oceanographic ship and facilities and a method for preparing the paint. The paint consists of the following components in percentage by weight: 15 to 55 percent of base material, 0.01 to 10 percent of antifouling agent, 10 to 30 percent of filler, 0.3 to 25 percent of pigment, 2 to 8 percent of auxiliary agent and 3 to 55 percent of solvent, wherein the antifouling agent is silver grains with average grain diameter of between 1 and 200nm. The paint does not contain toxic agents, such as dichloro-diphenyl-trichloroethane, organic tin,cuprous oxide and the like, at all while effectively suppressing corrosion of marine biological attachments, meets the related regulations of international maritime organization and future development trend of the antifouling paint, realizes non-toxicity and environmental friendliness of the marine antifouling technology, and can be widely applied to the facilities and the fields, such as ships, floating piers, marine oil platforms, submarine cables, cooling pipes of power plant near the sea, sea water culture net cage and the like.

The invention discloses a submarine cable detection underwater robot and an operating method. Mutual switching of a ROV mode and an AUV mode can be achieved by means of a cable security interface, thecapabilities of autonomous navigation, long-distance control and accurate detection are achieved, and the submarine cable detection underwater robot is used for construction exploration, daily routing inspection and failure detection of a submarine cable project. Construction exploration can be conducted on landform of a submarine cable route before the submarine cable project starts, daily inspection is conducted on burying and operation conditions of submarine cables which are put into operation already, and on-site close observation is conducted on the submarine cables being subjected to breaking down or cracking accidents.

The invention discloses an ultrahigh pressure cross linked polyethylene insulated flexible direct-current optical fiber composite submarine cable and relates to a direct-current cable. The ultrahigh pressure cross linked polyethylene insulated flexible direct-current optical fiber composite submarine cable is particularly used in large-power remote submarine power transmission in a flexible direct-current power consumption system of the vacuum control switch (VCS) current-switching technology and grid-tied connection among new energy alternating current systems of aperiodic operating wind power generation, tidal power generation and the like. The ultrahigh pressure cross linked polyethylene insulated flexible direct-current optical fiber composite submarine cable comprises direct-current cables, an optical fiber unit, a grounding feeder, filling strips, a main armor layer and an outer protective layer, wherein the two direct-current cables are respectively arranged on the left side and the right side, the optical fiber unit is arranged above the middle of the two direct-current cables, the grounding feeder is arranged under the middle portion of the two direct-current cables, and the cable is formed in a flat-supporting non-stranding mode; cable forming gaps are filled through arc-shaped filling strips; the direct-current cables, the optical fiber unit and the grounding feeder form the cable and then are armored through the main armor layer, the outer protectively layer is arranged on the surface of the main armor layer, anti-corrosion insulating glue is coated on each layer of polypropylene rope, and high-strength self-adhesive tapes are twisted outside the anti-corrosion insulating glue.

An offshore, floating, moored, nuclear power generating plant and multi-purpose platform is disclosed herein. In a preferred embodiment, the invention consists of a spar or cell spar platform with multi-purpose, all weather topside decks, attached to a submerged “dry tank” that further includes: reactor generator deck(s), power plant main control deck, and central plant deck, that are all integrated within a watertight ballast hull. The invention design further includes cells that are modular for facilitating factory assembly and ultimate construction in a shipyard environment. Reactor vessels are typical naval nuclear reactor having a time tested outstanding safety record. A plurality of reactor generator modules are interconnected and operate independently and collectively and are transmitted by a plurality of high voltage direct current (HVDC) submarine cables through a transformer to the electrical grid. Multipurpose topside decks house vessel commend, crew, and any ancillary and co-generation equipment. The present invention, constructed in a multi-path manufacturing process, provides exceptional economic, environmental, sustainability, security, safety, and operational advantages over the current art of power generation.

The invention discloses a three-core photoelectric composite submarine cable with 220kV rated voltage. The cable is characterized by comprising an outer layer, an armor layer and a lining layer which are distributed from outside to inside in turn, wherein three electrical units in which every two units are externally tangential to each other are arranged in the lining layer; a plurality of filling units are filled in three gaps which are enclosed by the electrical units and the lining layer; the three electrical units and all the filling units are stranded into a submarine cable main core part; a gluing cloth tape is lapped outside the stranded submarine cable main core part; and at least one of all the filling units is an optical unit, and the rest filling units are filling ropes. The invention has the advantages that: the three-core photoelectric composite submarine cable with the 220kV rated voltage has a balanced phase during use, does not have requirements on armoring materials, can prevent the magnetic loss of the armor layer and improves the effective utilization rate of power; and the occupied sea area is greatly reduced compared with that of a single-core submarine cable with the same specification.

The invention provides an on-line monitoring method for submarine cables. The method includes the steps of building a fault diagnosis model according to pressure field information, temperature field information, electric field information and the fault type when the submarine cables fail; distributing distributed optical fiber sensors for the submarine cables coaxially; monitoring and obtaining the pressure field information, the temperature field information and the electric field information of the submarine cables through the distributed optical fiber sensors; and determining whether the submarine cables fail and the type of faults according to the pressure field information, the temperature field information, the electric field information and the fault diagnosis model of the submarine cables. The method can perform accurate state on-line monitoring on the submarine cables and obtain state parameters of the submarine cables for fault diagnosis, and is provided with good identification degree.

The invention relates to a micro-sensing optical unit which is embedded inside or outside a cable, comprises a micro-sensing optical unit body and is characterized in that the micro-sensing optical unit body comprises an optical fiber for sensing, wherein a sealed stainless steel pipe is coated outside the optical fiber for sensing, and water-blocking fiber paste is filled in the stainless steel pipe; the number of the optical fiber for sensing can be 1 or two or plural, and the fiber excess length range in the stainless steel pipe is that the excess length is not less than 0 and less than 0.03%. The invention further relates to a cable, an optical cable, an aerial bare line and a submarine cable applying the structure in an embedded manner. The micro-sensing optical unit has high sensitivity to measured information of outside and can respond to temperature and strain in real time, the embedding process is simple and does not change the original performances of the optical cable, the temperature change can be reflected in a real-time manner, the smaller fiber excess length in the pipe can reduce the region of a stress and strain window of the optical fiber, the sensitivity to external stress (strain) reaction of the optical fiber can be improved, and the micro-sensing optical unit can not change the original structure and the performances of the optical cable and be embedded in the appropriate part of the optical cable and the cable.

A method of increasing usable bandwidth on a long-haul cable system having at least one optical fiber, the method comprising the steps of: (a) effecting counter-propagating first and second signals of different bands on a common long-haul optical fiber having cascaded optical amplifiers; and (b) band amplifying the first and second signals while reducing BRS in the bands.

The invention discloses an underwater robot control system and method for submarine cable routing inspection. The control system comprises a long-distance control part and a mission control part. Thelong-distance control part is located above the water surface and in charge of assigning operation missions to an underwater robot. The mission control part is connected with a power propellant part.The mission control part is configured to receive the operation missions assigned by the long-distance control part, and conduct route planning on the operation missions so as to control the power propellant part to implement corresponding actions, and thus multi-degree of freedom navigation of the underwater robot is achieved. Meanwhile, real-time adjusting is conducted on navigation parameters,and it is ensured that the underwater robot successfully complete the assigned operation missions.

The invention discloses a submarine photoelectric composite cable omni-directional monitoring and fault point accurate positioning method in the technical field of measurement. According to the method, the Brillouin distributed strain / temperature measurement technology is employed, the online monitoring of the real-time operation of a submarine photoelectric composite cable is realized, the real-time operation state information of the submarine photoelectric composite cable is obtained through analyzing Brillouin distributed fiber strain / temperature measurement data and is combined with actual submarine cable state information, submarine photoelectric composite cable routing feature information is extracted, and the detection and accurate positioning of a submarine cable fault point are realized. When the submarine photoelectric composite cable is failed, a megohmmeter is employed to detect the characteristic of the cable fault, the cable fault type is judged, and a time domain reflection method is employed to carry out fault monitoring and position the cable fault point in the photoelectric composite cable. Combined with a fiber fault point obtained through a Brillouin light time domain reflection test and the cable fault point position obtained through the time domain reflection method, the fault point geographical position information of the submarine photoelectric composite cable is accurately obtained.

The invention discloses a temperature rise strain monitoring and alarming and fault analysis method for a composite submarine cable. The method comprises the following steps of: performing real-time temperature stress sensing on the composite submarine cable by utilizing abundant single mode fibers in a submarine cable, and evaluating the safety state of the composite submarine cable according to a power supply harmonic test parameter to realize real-time monitoring of the composite submarine cable. According to the method disclosed by the invention, real-time distributive safety monitoring and alarming can be performed on the composite submarine cable, and the safety sate of the composite submarine cable is judged according to the monitored power grid quality parameter, communication optical fiber excited brillouin reflection frequency offset and calibration data; and the fault analysis is performed on the composite submarine cable having a fault to find out the main reason of the fault.

The invention discloses an anchor device of a photoelectric composite submarine cable platform anchor device, comprising a base and a holding and fixing mechanism, wherein the base is provided upwards with a fixing lug boss, the fixing lug boss is provided with an inverted cone-shaped hole, the inverted cone-shaped hole is internally provided with an inverted cone-shaped sleeve, the inverted cone-shaped sleeve is provided with a connection part, and the connection part is fixedly connected with the fixing lug boss. The inverted cone-shaped hole and the inverted cone-shaped sleeve are mutually matched, and the inverted cone-shaped sleeve is connected with the fixing lug boss through the connection part; therefore when in use, armoring steel wires of submarine cables are paved on the inner surface of the inverted cone-shaped hole firstly, and then the inverted cone-shaped sleeve is pressed on the armoring steel wires so that the armoring steel wires are positioned between the inner surface of the inverted cone-shaped hole and the outer surface of the inverted cone-shaped sleeve and the inner surface of the inverted cone-shaped hole is closely connected with the outer surface of the inverted cone-shaped sleeve, the inverted cone-shaped sleeve is steadily fixed on the fixing lug boss by the connection part, the end heads of the armoring steel wires are bent and tightly pressed between the connection part and the fixing lug boss due to the downward pressure, in addition, the self-weight of the submarine cables can connect the inverted cone-shaped sleeve and the inverted cone-shaped sleeve tightly, thus the submarine cables are effectively fixed.

The present invention relates to a cable telescopic arc device which comprises a clamp, a guide rail, a cable and a sliding plate. The clamp is arranged on the sliding plate. The cable is connected with the clamp at a side by the guide rail. The cable is set as an arch bridge structure. The sliding plate is arranged at a position of the arch bridge structure of the cable. Compared with the prior art, according to the invention, a conventional cable is used to substitute an expensive submarine cable, economical efficiency is high, a power cable is laid through a bridge, a channel is provided for the future repair and maintenance of the cable, the reliability of cable operation is greatly raised, moreover, the cable can cope with expansion and contraction amplitudes of the bridge, and a service life of the cable is long.

A float-type offshore power generating platform comprises a float, an anchoring system, a power generating system, a power transmission and distribution system, and an energy-storage system, and is fixed in a sea area near a small island in an anchoring manner, a plurality of box bodies are integrally connected to form a platform through bolts, the float is used for providing buoyancy force for the platform, and the box bodies comprise a plurality of wind power generating box bodies, a plurality of solar power generating box bodies, a plurality of ocean current power generating box bodies and an energy storage box. During the work of the platform, electric power produced by the power generating system is partly conveyed to the load on an island through a submarine cable, redundant electric power is used for preparing hydrogen through electrolyzed water and the hydrogen is stored in a hydrogen fuel battery, and in case of natural energy source insufficiency, the fuel battery can be used as an auxiliary energy source for supplying power to the load. According to the float-type offshore power generating platform, clean energy is adopted for power generation, the land space of the island is not occupied, the power generating system is modularized, and the mounting and the dismounting are convenient.

The invention discloses a method and device for monitoring a submarine cable system, belonging to the communication field. The method comprises the following steps: dividing the light signals emitted by a light source to a transmission link of the submarine cable system into two channels; and ensuring the returned light signals in the multichannel detected light signals with different frequenciesto be coherent with the local coherent light to obtain the monitoring result, wherein one channel of light signals serve as the local coherent light and the other channel of light signals serve as the multichannel detected light signals with different frequencies after undergoing multichannel frequency shift. The device comprises a light source, a multichannel frequency shift module and a coherent module. By parallel emitting the detected signals, the method and device of the invention improve the monitoring performance, greatly shorten the detection time, have no blind monitoring areas, solve the problem of sample data alignment, save data space and time for mass data to stack and cache and reduce the light power spectrum density and the nonlinear effects of the detected light signals.

An underwater detection apparatus for detecting a presence of one or more bubbles within an aquatic environment includes a first structure including a lower peripheral edge for defining an area over which the apparatus is operable to collect the one or more bubbles, a second structure for spatially concentrating the one or more bubbles received within the area defined by the lower peripheral edge into a detection region, and a detection arrangement for detecting the one or more bubbles concentrated in operation by the bubble concentrating structure passing into the detection region and generating an output signal indicative of the one or more bubbles passing through the detection region. The apparatus is optionally mounted upon an aquatic remotely operated vehicle (ROV). The apparatus is beneficially employed for investigating sources of one or more bubbles in aquatic environments, for example from oil exploration and / or production leaks, from damaged electrical subsea cables, from leaks from seabed gas pipelines and similar.

A power-generating device located in or on the surface of the ocean for generating power utilizing the energy in ocean wave motion. The device is moored to the bow and stern at ˜45° to incoming ocean waves, and with a yawing capability to adjust to change in wave direction. The device delivers power to a shore grid via a submarine cable from a generator. A rotational driving torque to the generator is produced by two long counter-rotating drive tubes, which are held by bearings in the bow hull and the stern hull of the device. As an alternative, hydraulics may be employed for energy capture and power smoothing and used to provide the rotational torque through a hydraulic motor to drive a generator. The main body is partially submerged and has multiple pod floats connected to the structure by rocker arms with bearings through which the drive tubes pass or double-acting hydraulic rams between the arms and the main body, which capture energy through pod displacement and store it in accumulators. Rotary torque of the drive tubes is produced when the pods move up and down according to motion of the waves and is transmitted to the generator to generate power. In the hydraulic case, energy is stored in accumulators as pressure due to the double-acting hydraulic pistons pumping when the pods move up and down according to the motion of the waves. Hydraulic pressure drives a pump, which provides torque to the generator.

The invention discloses a multiphase transversal arrangement circular laying construction method, which adopts a major engineering barge as a submarine cable laying ship, and adopts transversal arrangement of submarine cables, back-twist of a pi-shaped back-twist rack and transverse pull of heave away anchors of the barge, and comprises the concrete steps of construction preparation, top end landing construction, middle sea segment laying construction, tail end landing construction, circularly laying construction and submarine cable protection. The method has the advantages that the effective operation area is large, the adverse environmental impact can be effectively resisted, the laying and inclination adjustment efficiency is improved, measurement and control can be accurately performed, the routing deviation is avoided, the degree of automation is high, and the construction efficiency is high.

The invention discloses a submarine cable real-time monitoring system and a submarine cable real-time monitoring method in the technical field of measurement. According to the technical scheme, the submarine cable real-time monitoring system is designed, the temperature and the strain of a submarine cable in the operation process are achieved by detecting the polarization state and the phase of backward Rayleigh scattering light, and therefore real-time monitoring of state information of external damage, insulation degradation, electric leakage, ground faults and the like is achieved. The utilization rate of equipment is improved, the monitoring cost is reduced, and in addition, the missing report rate and the false judging rate are greatly reduced. Three-dimensional, large-range, whole-circuit and networked real-time monitoring of the submarine cable can be achieved, and the submarine cable real-time monitoring system and the submarine cable real-time monitoring method are of great significance in safe and stable operation of the submarine cable.

The invention belongs to the field of supporting device for submarine cable embedding of a cable laying ship, and particularly relates to a retractable towing winch of a submarine cable embedding machine. The retractable towing winch comprises a cable storage winch and a cable dragging winch, wherein the cable dragging winch drives a cable dragging reel to rotate through a cable dragging winch; the cable storage winch comprises a roper guider and a cable storage mechanism; the rope guider comprises a guide wheel, a guide wheel supporting bracket, a guide wheel supporting base and a guide wheel motor; a wire rope deflection detecting device and a wire rope length counting device are arranged on the guide wheel supporting bracket, wherein the wire rope deflection detecting device sends a signal to control the rotation of the rope guider motor, and further control the movement of the guide wheel supporting bracket so as to remove the deflection of the wire rope; the cable storage mechanism drives the cable storage reel to rotate through the cable storage winch; one end of the wire rope enters the rope guider after being coiled by the cable dragging reel, and then coils on the cable storage reel after being folded at 90 degrees by the guide wheel, and the cable storage winch performs the constant tension control on the wire rope. The retractable towing winch satisfies the demand of high load, big loading change and big rope capacity of the retractable towing winch of the submarine cable embedding machine.

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 invention discloses a submarine cable anchoring device which comprises a seat, inverted tapered holes arranged on the seat, inverted tapered coverings arranged in the inverted tapered holes with the outer surface of the inverted tapered covering matched with the inner surface of the inverted tapered hole and a pressing plate arranged above the seat which is connected with the seat through connectors. The pressing plate is provided with a ring-shaped clamping surface which is matched with the contour of the upper part of the inverted tapered covering. Mounting holes are arranged along the edges of the seat and connected with external. The invention has the advantages that, as the ring-shaped clamping surface of the pressing plate is matched with the contour of the upper part of the inverted tapered covering and the inverted tapered covering is matched with the inverted tapered hole on the seat, the inverted tapered covering closely fits with the inner surface of the inverted tapered holes under the pressure of the pressing plate, and tightly clamps with the inner surface of the inverted tapered hole owing to the self weight of the submarine cable, thereby ensuring the submarine cable to be effectively fixed to a working platform. The invention has the advantages of strong mechanical strength, strong resistance to seawater corrosion, simple structure and reliable performance. The invention is suitable to be used for deep well service or other working platforms.

The invention discloses a method for preparing a photoelectric composite submarine cable and belongs to the field of preparation methods of cables. The method comprises the process steps of drawing wire, stranding, co-extruding, wrapping, degassing, adding a lead sheath, extruding a polyethylene (PE) sheath, vertical cabling and stranding, stranding optical units, armoring steel wire, sleeving outer sheath, rewinding a finished product and the like. The processes of conductors, insulating wire cores, degassing, pressing lead, extruding the sheath layer, three-core vertical cabling, wrapping, armoring steel wire and the like are connected in series, a joint-free whole large-length three-core photoelectric composite submarine cable is realized. The flexible joint of the large-length three-core photoelectric composite submarine cable is effectively avoided, so that the normal use and the service life of the submarine cable are guaranteed.

The invention relates to a submarine cable with an increased current-carrying capacity. Conductor layers comprising a plurality of annealed copper wires with high conductivity are tightly distributed at the periphery of a tin-plated copper spiral pipe; a carbon black paper conductor shielding layer, an oil-filled high-voltage cable paper insulating layer, a carbon black paper insulation shielding layer, a copper strip insulation shielding layer and a seamless lead-alloy sheath are wrapped at the periphery of the conductor layers sequentially; asphalt is evenly coated at the periphery of the seamless lead-alloy sheath; and a self-adhesive polyethylene strip inner cushion layer, double stainless steel strip strengthening layers, a self-adhesive polyethylene strip outer cushion layer, a non-woven fabric liner layer, a high-density polyethylene corrosion resisting layer, an armoured inner cushion layer formed by evenly soaking hemp ropes at intervals through polypropylene ropes in a concentric stranding manner, an armoured layer formed by uniform spacing of aluminum-magnesium-plated alloy steel wires and a copper wire in the concentric stranding manner and an outer protecting layer are wrapped at the periphery of the seamless lead-alloy sheath sequentially. The submarine cable has a larger current-carrying capacity and is excellent in water seepage resistance, seawater corrosion resistance, external water pressure resistance, voltage thermal shock resistance and tension bending resistance. In addition, the submarine cable also has the advantages of long service life and high reliability.

The invention discloses a marine wind power direct current collecting power transmission system and a design method. The marine wind power direct current collecting power transmission system comprises a wind farm inner electric energy collecting module, a wind farm direct current boost module, a high voltage direct current collecting and transmission module, and a land converter station grid-connected module, wherein the wind farm inner electric energy collecting module comprises a plurality of wind power generators and AC-DC rectifiers, each wind power generator converts wind energy to three-phase alternating current electric energy, the electric energy is converted to direct current electric energy via the AC-DC rectifiers, the wind farm direct current boost module comprises a plurality of DC-DC topology structures, the energy of fans in the wind farm is collected to a direct current boost station via direct current and boosted via DC-DC converters, the high voltage direct current collecting and transmission module is used for collecting high voltage direct current electric energy outputted by each wind farm, transmitting the energy to the land via a common submarine cable, and performing grid connection via a high-capacity converter station, and the land converter station grid-connected module comprises a grid-connected converter station arranged at the land side and a direct current power transmission converter station.

The invention discloses a submarine cable underwater synchronous paying-off underwater vehicle which is characterized by comprising a shipborne mechanical system, a synchronous pushing system, a pneumatic launching system, a calculation center control system and a dragging and underwater-moving system. The technologies of electric automatization, aerodynamics, mechatronics and single chip microcomputer control and the like are integrated, underwater operation can be achieved, and the underwater vehicle is less affected by stormy waves; automatic detection and real-time paying-off can be achieved, the positioning precision is 0.5-3 m, the course accuracy is 0.01 degree, and a cable line corridor can be accurately controlled; cable laying is high in speed and can be controlled in real time, and the highest cable laying speed can reach 50 KM / h; the automation degree is high, and the number of construction staff is greatly decreased; the integration degree is high, and the whole process can be monitored; construction obstacles for the cable line corridor do not need to be cleared away, so that the environment is protected; all the systems can be recycled, and secondary investment is low; the systems operate synchronously, and the tension force of submarine cable laying is reduced; the line first-aid repair capability is high, and the submarine cable underwater synchronous paying-off underwater vehicle is suitable for line reconstruction work after seaquakes; and the structure is reasonable, and the performance is reliable.

A method, a device and a communication system for locating submarine cable fault are disclosed by the embodiments of the present invention. The optical pulse output by the repeater(RPT) is transmitted to the fault point as the probe optical pulse; the RPT obtains the time difference between the probe optical pulse and the reflected optical pulse, and transmits the time difference to the terrestrial Submarine Line Terminal Equipment(SLTE), therefore the SLTE can easily locate the fault point according to the Optical Time Domain Reflector(OTDR) theory. Compared with the prior art, the method can locate the submarine fault point faster and more accurately, therefore the maintainer can maintain the fault in time.

The invention discloses a main base station of submarine observation network based on a constant-current power supply. The main base station is connected in series in a backbone network submarine cable. The main base station is connected with a shore base station and an adjacent main base station through a submarine cable terminal box. The main base station comprises an underwater power supply anda communication control module. The underwater power supply is used for converting a constant-current power supply provided by a shore base station into a power supply of the main base station and aplurality of backup power supplies, outputting a direct-current constant-voltage power supply to the communication control module, and controlling the main base station to be networked and offline. The communication control module is used for monitoring the internal state of the main base station in a master control backup manner and sending the state information and data uploaded by the externalequipment to the shore base station. The communication control module is also used for receiving an instruction of the shore base station to perform fault isolation when the internal state has a fault. The main base station of submarine observation network based on the constant-current power supply has the advantages of high power and high reliability. The problems that a constant-voltage power supply type main base station is poor in submarine cable fault resistance and poor in robustness are solved.