CN105321602A - Offshore large capacity wind power generation cable - Google Patents

Abstract

The invention discloses a large-capacity offshore wind power generation cable, which includes several insulated wire cores, the insulated wire cores are mutually twisted into a cable, and each insulated wire core includes a conductor, an insulating layer and an insulating layer arranged from the inside to the outside. Copper sleeve, the insulating layer is a vacuum, the copper sleeve and the conductor are in a concentric circle structure, and a number of isolation support rods are connected between the conductor and the copper sleeve, and the isolation support rods are made of plastic material. The outer side of the cable is covered with a water blocking strip, an inner sheath, a reinforcement layer and an outer sheath in sequence from the inside to the outside, and the gap between the insulated wire cores is filled with a carbon fiber composite mandrel. The material of the sheath is high foaming polyethylene, the reinforcing layer is a braided structure in which tinned copper wires and aramid fibers are cross-braided, and the material of the outer sheath is polyether polyurethane. The large-capacity offshore wind power generation cable of this solution has the effects of high installed capacity, strong tensile capacity, and good waterproof performance.

Description

Offshore large-capacity wind power generation cables

technical field

The invention relates to an offshore large-capacity wind power generation cable.

Background technique

With the development of wind power generation, wind power has become the fastest growing new energy in the world. Offshore wind power generation embodies the highest level of wind power generation technology today. my country's offshore wind energy resources are abundant, and the eastern coast, especially Jiangsu coastal tidal flats and offshore areas have Excellent conditions for the development of wind energy, which already has the basic conditions for large-scale development. According to the preliminary results of the China Meteorological Administration's detailed investigation of wind energy resources, it is measured that the total power of wind power generation in my country's offshore areas within the water depth line of 5 meters to 25 meters and at a height of 50 meters above sea level can reach about 200 million kilowatts, and when the height is above 70 meters The total power of wind power generation can reach about 500 million kilowatts.

Offshore wind power is an important part of my country's new energy strategy, and plays an important role in the implementation of energy conservation and emission reduction plans and the development of strategic emerging industries. The "Twelfth Five-Year Plan" is a critical period for my country's offshore wind power to lay the foundation, and a number of large-scale offshore wind power projects will be built. In view of the fact that wind power projects with large installed capacity are built on sea level, the capacity of supporting cables for connecting wind power equipment to floating wind power generation is also large.

However, the transmission power of the existing offshore wind power generation cables is not large, that is, the capacity is small, the tensile capacity is weak, the waterproof performance is poor, and the aging of insulating electrical branches and water branches is serious, which cannot meet the needs of offshore wind power generation.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects in the prior art that the transmission power of the cable used for offshore wind power generation is small, the aging of insulating electrical branches and water branches is serious, the tensile strength is weak, and the waterproof performance is poor, providing The utility model relates to a cable for large-capacity wind power generation at sea.

The present invention solves the above technical problems through the following technical solutions:

An offshore large-capacity wind power generation cable, comprising several insulated wire cores, the insulated wire cores are mutually twisted into a cable, and the feature is that each insulated wire core includes a conductor, an insulating layer and a Copper sleeve, the insulating layer is a vacuum, the copper sleeve and the conductor are in a concentric circle structure, and a number of isolation support rods are connected between the conductor and the copper sleeve, and the isolation support rods are made of plastic material. The outer side of the cable is covered with a water blocking strip, an inner sheath, a reinforcement layer and an outer sheath in sequence from the inside to the outside, and the gap between the insulated wire cores is filled with a carbon fiber composite mandrel. The material of the sheath is high foaming polyethylene, the reinforcing layer is a cross braided structure of tinned copper wire and aramid fiber, and the material of the outer sheath is polyether polyurethane.

In this scheme, vacuum is used as the insulating layer. Since the dielectric coefficient of vacuum is ε ₀ =8.86х10 ^-12 F/m, it is far smaller than the dielectric coefficient of the existing cable insulation layer of cross-linked polyethylene, which is 2.3F. /m, so the capacitance of the vacuum insulation is small and the transmission capacity is large. In addition, when vacuum is used as the insulating layer, there will be no aging of electric branches and aging of water branches on the conductor insulation, which greatly prolongs the life of the cable. The carbon fiber composite core rod is filled in the gap of the insulating core, so that the cable has a strong tensile capacity. The combination of water-blocking tape, high-foamed polyethylene inner sheath and polyether polyurethane outer sheath makes the cable have excellent waterproof performance, which greatly enhances the ability of the cable to adapt to complex environments.

Preferably, the overlapping rate of the water blocking zone is 10-15%. The overlap rate refers to the proportion of the overlapped part to the entire water blocking zone.

Preferably, the high foamed polyethylene has a density of 0.1 g/cm ³ . Highly expanded polyethylene is commercially available, and the density refers to the weight of the substance per unit volume.

Preferably, the weaving density of the weaving structure is greater than or equal to 85%. The weaving density refers to the density of the interweaving of tinned copper wire and aramid fiber wire.

Preferably, the pitch ratio of the bundled wires of the conductor is 14-16, the pitch ratio of the complex twisted wires of the conductor is 6-8, and the pitch ratio of the twisted insulated cores is 10-12. Among them, the bundled wire is a twisted wire formed by twisting together a plurality of single wires at a certain pitch according to the same twisting direction, and the multi-stranded wire is a twisted wire formed by normal concentric twisting of the bundled wires. The twisting direction of the multi-stranded wire is generally opposite to that of the bundled wire. The pitch ratio is a fixed value, which refers to the ratio of the pitch length to the outer diameter of the stranded wire.

The positive and progressive effect of the present invention is that the offshore large-capacity wind power generation cable of this scheme has large transmission capacity, material saving, low energy consumption, good waterproof performance, strong tensile capacity, no aging of electric branches and aging of water branches in the insulating layer Effect.

Description of drawings

Fig. 1 is a structural schematic diagram of a cable for offshore large-capacity wind power generation according to the present invention.

detailed description

The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.

This embodiment provides a cable for large-capacity offshore wind power generation, as shown in Figure 1, including a number of insulated wire cores 1, the insulated wire cores are twisted with each other to form a cable, each insulated wire core includes a cable from the inside to the outside The conductor 10, the insulating layer 11 and the copper sleeve 13 are set, the insulating layer 11 is a vacuum, the copper sleeve 13 and the conductor 10 are in a concentric circle structure, and several isolation support rods 12 are connected between the conductor 10 and the copper sleeve 13, and the isolation support rods 12 It is made of plastic, and it adopts a hub-type structure to be uniformly isolated to avoid contact between the conductor 10 and the copper sheath 13. The outside of the cable is covered with a water-blocking tape 3, an inner sheath 4, and a reinforcement layer 5 in sequence from the inside to the outside. And an outer sheath 6, the gap between the insulated wire cores 1 is filled with carbon fiber composite mandrel 2, the material of the inner sheath 4 is high foam polyethylene, and the reinforcement layer 5 is cross-braided with tinned copper wire and aramid fiber The braided structure, the material of the outer sheath 6 is polyether polyurethane.

Among them, the carbon fiber composite mandrel is composed of carbon fiber and epoxy resin composite material, the overlapping rate of the water blocking zone is 10%, the density of high foamed polyethylene is 0.1g/cm ³ , the weaving density of the braided structure is equal to 85%, and the conductor’s The pitch ratio of the bundled wire is 14, the pitch ratio of the conductor's complex twisted wire is 6, and the pitch ratio of the insulated wire core twisted is 10.

Compared with the existing offshore wind power generation cables, the offshore large-capacity wind power generation cables of this embodiment have the advantages of large transmission capacity, material saving, low energy consumption, good waterproof performance, strong tensile capacity, and no aging of electrical branches in the insulating layer. And the advantages of water branch aging phenomenon. In order to characterize the effect of this embodiment on the existing offshore wind power generation cables, according to the cable standard GB/T12706.2-2008, the offshore large-capacity wind power generation cables of this embodiment were tested accordingly, and the prior art The cable used for offshore wind power generation is used as a comparative example. The cable model of this comparative example is FDYJV. After comparison, the cable of this embodiment can withstand the power frequency test voltage of 30.5kV for 5 minutes. The cable has no breakdown at this time. , while the cables with a comparison ratio of 1kV or 3kV will be broken down and scrapped, that is, the cables of this embodiment can withstand higher voltages for a long time, so that the total power transmitted by the cables when used as wind power generation is higher, so that the transmission capacity larger.

However, according to the provisions of Appendix F in the standard GB/T12706.2-2008, it was measured that the two ends of the cable in this embodiment were dry and no moisture leaked out, while the two ends of the cable in the comparative example had obvious water droplets seeping out. It can be seen that the waterproof performance of this embodiment is better.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (5)

1. A cable for large-capacity wind power generation at sea, comprising several insulated wire cores, said insulated wire cores are mutually twisted into a cable, and it is characterized in that each insulated wire core includes conductors, insulating wires arranged from inside to outside Layer and copper sleeve, the insulating layer is a vacuum, the copper sleeve and the conductor are in a concentric circle structure, and a number of isolation support rods are connected between the conductor and the copper sleeve, and the isolation support rods are made of plastic material , the outer side of the cable is covered with a water blocking strip, an inner sheath, a reinforcement layer and an outer sheath in sequence from the inside to the outside, and the gap between the insulated wire cores is filled with a carbon fiber composite mandrel, so The material of the inner sheath is high foaming polyethylene, the reinforcement layer is a cross-braided structure of tinned copper wire and aramid fiber, and the material of the outer sheath is polyether polyurethane. 2 . The offshore large-capacity wind power generation cable according to claim 1 , wherein the overlap rate of the water blocking zone is 10-15%. 3 . 3 . The offshore large-capacity wind power generation cable according to claim 1 , wherein the density of the high foamed polyethylene is 0.1 g/cm ³ . 4. The offshore large-capacity wind power generation cable according to any one of claims 1-3, characterized in that the braiding density of the braided structure is greater than or equal to 85%. 5. The offshore large-capacity wind power generation cable according to claim 4, characterized in that, the pitch ratio of the bundled wires of the conductor is 14-16, and the pitch ratio of the multiple strands of the conductor is 6-8, The pitch diameter ratio of the stranding of the insulated wire cores is 10-12.