35kV power cable for offshore wind power generation

Abstract

The utility model discloses a 35kV power cable for offshore wind power generation, which comprises a conductor, a semi-conductive water-blocking wrapping tape is wrapped outside the conductor, a three-layer co-extrusion insulating layer is extruded outside the semi-conductive water-blocking wrapping tape, a semi-conductive water-blocking tape is overlapped and wrapped outside the three-layer co-extrusion insulating layer, and the semi-conductive water-blocking tape is wrapped outside the three-layer co-extrusion insulating layer. An alloy lead inner sheath and a polyethylene inner sheath are sequentially extruded outside the semi-conductive water-blocking tape to form wire cores, the wire cores are twisted to form a cable core, a water-blocking tape is lapped outside the cable core to tighten the cable core, a polypropylene fiber layer is lapped outside the water-blocking tape, an alloy lead outer sheath and a polyethylene inner cushion layer are extruded outside the polypropylene fiber layer, and the polyethylene inner cushion layer is extruded outside the alloy lead outer sheath and the polyethylene inner cushion layer. A galvanized steel wire armor layer is wound outside the polyethylene inner cushion layer, and an outer sheath is wrapped on the outermost layer. The cable provided by the utility model has excellent performances of corrosion resistance, tension resistance, pressure resistance, water resistance, water resistance and the like, and is mainly used in the fields of offshore wind power, offshore oil and gas exploitation, power transmission between land and islands and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field especially relates to a 35kV power cable for offshore wind power generation. BACKGROUND

[0002] The power cable for offshore wind power generation is an important component of offshore wind power system, and its performance and design directly affect the stable operation of the wind farm and the power transmission efficiency. It is used for connecting wind turbines in series and transmitting power to offshore substations. For small wind farms, array cables can be directly connected to onshore substations. Cable technical requirements:

[0003] Corrosion resistance: the offshore environment is severely salt fog corroded, and the cable needs to have good corrosion resistance.

[0004] Torsion resistance: wind turbines will produce mechanical movement during operation, and the cable needs to have good torsion resistance.

[0005] High transmission power: offshore wind turbines have large power, and the cable needs to have high transmission power.

[0006] Minimum bending radius: the cable has a specified minimum bending radius, and failure to maintain this radius during transportation, installation and operation will greatly increase the risk of cable damage.

[0007] The application of the power cable for offshore wind power generation in offshore wind power mainly includes transmission between offshore wind turbines and transmission between offshore booster stations and land. The sea cable for transmitting power between wind turbines is called array sea cable (also called power collection sea cable), which can connect wind turbines in series and transmit power from wind turbines to offshore booster stations, and then transmit power from the outgoing sea cable (also called main sea cable) to the onshore booster station to realize offshore wind power transmission function. Due to long-term operation in complex seabed environment, the product needs to meet the basic electrical performance, and has higher requirements for water resistance, mechanical properties, corrosion resistance and anti-bite. The overall technical and performance requirements are high. Our company designs according to the current market demand and develops a 35kV power cable for offshore wind power generation. INVENTION CONTENTS

[0008] The utility model aims at making up for the defects of prior art, and provides a 35kV power cable for offshore wind power generation. The utility model has excellent electrical performance, and also has good water resistance, mechanical properties, corrosion resistance and other characteristics. It is laid in underwater environment and bears the heavy responsibility of offshore power transmission. It is widely used in power transmission between land and islands / islands / islands, offshore oil and gas exploration, seabed observation exploration, marine scientific research, offshore wind power and other marine fields.

[0009] The utility model is realized through the following technical solutions:

[0010] A 35kV offshore wind power cable, comprising a conductor, a semi-conductive water-blocking wrapping tape wrapped outside the conductor, a three-layer co-extruded insulation layer extruded outside the semi-conductive water-blocking wrapping tape, a semi-conductive water-blocking tape overlapped and wrapped outside the three-layer co-extruded insulation layer, an alloy lead inner sheath and a polyethylene inner sheath successively extruded outside the semi-conductive water-blocking tape to form a core, the cores being twisted into a cable core, a water-blocking tape wrapped outside the cable core to tighten the cable core, a polypropylene fiber layer wrapped outside the water-blocking tape, an alloy lead outer sheath and a polyethylene inner cushion layer extruded outside the polypropylene fiber layer, and a galvanized steel wire armor layer wound outside the polyethylene inner cushion layer, and an outer sheath wrapped outside the galvanized steel wire armor layer.

[0011] The conductor is a copper core profiled conductor.

[0012] The three-layer co-extruded insulation layer comprises an inner semi-conductive shielding layer, a cross-linked polyethylene insulation layer and an outer semi-conductive shielding layer from inside to outside.

[0013] The cable core is filled with a water-blocking rubber filling layer to round off.

[0014] The galvanized steel wire armor layer is coated with asphalt on the outside.

[0015] The outer sheath is a polypropylene fiber outer sheath.

[0016] Conductor and insulation structure:

[0017] The conductor of the cable is a copper core profiled conductor, which has good electrical conductivity and mechanical strength.

[0018] The semi-conductive water-blocking wrapping tape wrapped outside the conductor can effectively prevent water penetration and prevent water from spreading along the conductor, thereby avoiding the decline of insulation performance caused by water.

[0019] The three-layer co-extruded insulation layer extruded outside the semi-conductive water-blocking wrapping tape comprises an inner semi-conductive shielding layer, a cross-linked polyethylene insulation layer and an outer semi-conductive shielding layer. This structure can effectively improve the electric field distribution, reduce the electric field concentration phenomenon and improve the electrical performance of the cable.

[0020] The semi-conductive water-blocking tape wrapped outside the insulation layer further enhances the waterproof performance of the cable.

[0021] Sheath and armor structure:

[0022] The alloy lead inner sheath and the polyethylene inner sheath successively extruded outside the semi-conductive water-blocking tape, the alloy lead inner sheath has good corrosion resistance and can resist corrosion of seawater and salt mist.

[0023] The cable core is filled with a water-blocking rubber filling layer to round off, and the water-blocking rubber filling layer can absorb water and expand to further prevent water from spreading.

[0024] The cable core is tightly bound by the water-blocking tape to prevent water from entering the interior of the cable core.

[0025] The water-blocking tape is wrapped with a layer of polypropylene fibers, which have good mechanical properties and corrosion resistance.

[0026] The polypropylene fiber layer is further wrapped with an alloy lead outer protective layer and a polyethylene inner cushion layer, which further enhances the corrosion resistance of the cable.

[0027] The polyethylene inner cushion layer is further wrapped with a galvanized steel wire armor layer, which provides additional mechanical protection to prevent the cable from being damaged by external mechanical forces.

[0028] The galvanized steel wire armor layer is coated with asphalt on the outside, which has good waterproof and corrosion-resistant properties and can further protect the cable.

[0029] The outermost layer is wrapped with a polypropylene fiber outer protective layer, which has good wear resistance and corrosion resistance.

[0030] The utility model has excellent waterproof performance:

[0031] Through the design of multiple water-blocking structures, such as semi-conductive water-blocking tape, semi-conductive water-blocking tape, water-blocking rubber filling layer, and water-blocking tape, the penetration and spread of water can be effectively prevented, ensuring the long-term stable operation of the cable in a humid marine environment.

[0032] It has good electrical performance:

[0033] The three-layer co-extrusion insulation layer design can effectively improve the electric field distribution, reduce the electric field concentration phenomenon, and improve the electrical performance of the cable, ensuring the reliability and safety of power transmission.

[0034] It has strong corrosion resistance:

[0035] The use of alloy lead inner sheath, alloy lead outer protective layer, and asphalt coating can effectively resist the corrosion of seawater and salt mist, prolonging the service life of the cable.

[0036] It has reliable mechanical protection:

[0037] The cable core is filled with a water-blocking rubber filling layer, tightly bound with a water-blocking tape, and protected by a galvanized steel wire armor layer, which can prevent the cable from being damaged by external mechanical forces and ensure the reliability of the cable in a complex marine environment.

[0038] It has the ability to adapt to complex environments:

[0039] The structure design of the cable can adapt to the complex operation environment of the offshore wind farm, including high humidity, high salt mist concentration, mechanical vibration and the like, and meets the high requirements of the offshore wind power on the cable.

[0040] The utility model discloses 35kV offshore wind power power cable realizes excellent waterproof, electrical, anticorrosive and mechanical performance through its unique structure design, can effectively satisfy the special demand of offshore wind farm, ensures the reliability and stability of power transmission.

[0041] The utility model discloses a cable design adopts the firm protection layer and excellent anti-sea water material, can work stably in the sea water severe environment, ensures the reliability and stability of electric energy transmission, the utility model discloses excellent corrosion -resistant, tensile pressure -resistant, water -resistant and the like, is mainly used in offshore wind power, ocean oil and gas exploitation, land and island power transmission field and the like. DRAWINGS

[0042] Figure 1 It is the structure schematic drawing of the utility model. CONCRETE IMPLEMENTING METHOD

[0043] The utility model discloses 35kV offshore wind power power cable further is explained with the embodiment through the accompanying drawing.

[0044] Embodiment one:

[0045] As Figure 1 Shown, a kind of 35kV offshore wind power power cable, including conductor 1, the conductor 1 is copper core special-shaped conductor.In the conductor 1 outer semi-conductive water-blocking tape 2 is wound, in semi-conductive water-blocking tape 2 outer three-layer co-extrusion insulation layer is extruded and packed, in the three-layer co-extrusion insulation layer outside overlap winding semi-conductive water-blocking tape 6, in semi-conductive water-blocking tape 6 outer alloy lead inner sheath 7 and polyethylene inner sheath 8 are extruded and packed in sequence to constitute wire core, each wire core is stranded into cable core, in the cable core outer water-blocking tape 10 is wound and cable core is tied tight, in water-blocking tape 10 outer polypropylene fiber layer 11 is wound, in the polypropylene fiber layer 11 outer alloy lead outer sheath 12 and polyethylene inner pad layer 13 are extruded and packed, in polyethylene inner pad layer 13 outer galvanized steel wire armor layer 14 is wound, outermost layer is wound with outer sheath 15.

[0046] Embodiment two:

[0047] A 35kV power cable for offshore wind power generation includes a conductor 1, a semi-conductive resistive water-resistant wrapping tape 2 wrapped around the conductor 1, and a three-layer co-extruded insulation layer extruded over the semi-conductive resistive water-resistant wrapping tape 2. The three-layer co-extruded insulation layer, from the inside to the outside, includes an inner semi-conductive shielding layer 3, a cross-linked polyethylene insulation layer 4, and an outer semi-conductive shielding layer 5. A semi-conductive resistive water-resistant tape 6 is wrapped around the outside of the three-layer co-extruded insulation layer. An alloy lead inner sheath 7 and a polyethylene inner sheath 8 are then extruded over the semi-conductive resistive water-resistant tape 6 to form a wire core. The wire cores are twisted together to form a cable core. A water-blocking tape 10 is wrapped around the cable core to secure it. A polypropylene fiber layer 11 is wrapped around the water-blocking tape 10. An alloy lead outer sheath 12 and a polyethylene inner padding layer 13 are extruded over the polypropylene fiber layer 11. A galvanized steel wire armor layer 14 is wound around the polyethylene inner padding layer 13. The outermost layer is an outer sheath 15.

[0048] Example 3:

[0049] A 35kV power cable for offshore wind power generation includes a conductor 1, which is a copper core shaped conductor. A semi-conductive water-resistant wrapping tape 2 is wrapped around the conductor 1. Three layers of co-extruded insulation are extruded over the semi-conductive water-resistant wrapping tape 2. A semi-conductive water-resistant tape 6 is then wrapped around the outside of the three layers of co-extruded insulation. An alloy lead inner sheath 7 and a polyethylene inner sheath 8 are then extruded over the semi-conductive water-resistant tape 6 to form a wire core. These wire cores are twisted together to form a cable core. A water-blocking tape 10 is wrapped around the cable core to secure it. A polypropylene fiber layer 11 is wrapped around the water-blocking tape 10. An alloy lead outer sheath 12 and a polyethylene inner padding layer 13 are extruded over the polypropylene fiber layer 11. A galvanized steel wire armor layer 14 is wound around the polyethylene inner padding layer 13. The outermost layer is an outer sheath 15. The cable core is filled with a water-blocking rubber filling layer 9 to form a round shape. Asphalt is coated on the outside of the galvanized steel wire armor layer 14. The outer sheath 15 is a polypropylene fiber outer sheath.

[0050] The cable conductor 1 of this utility model is a copper core irregular conductor 1, which adopts a twisted wire structure design. After the conductor 1 is twisted, it is like a whole copper rod with basically no gaps between the individual wires, which has a good longitudinal waterproof effect. In addition, the surface of the conductor 1 is smooth and burr-free, avoiding damage to the insulation caused by burrs. It also has good conductivity and mechanical strength.

[0051] The conductor 1 is wrapped with a semiconducting resistive water-wrapping tape 2, which can effectively prevent the penetration of water and prevent water from spreading along the conductor 1, thereby avoiding the decrease in insulation performance caused by water.

[0052] The three co-extruded insulation layers, including the inner semi-conductive shielding layer 3, the cross-linked polyethylene insulation layer 4, and the outer semi-conductive shielding layer 5, can effectively improve the electric field distribution, reduce electric field concentration, improve the electrical performance of the cable, ensure the reliability and safety of power transmission, and enable the cable to reach the rated voltage withstand level.

[0053] The insulating layer is externally overlapped with a semi-conductive water-blocking tape 6 to protect the inner layer and has a water-blocking effect. The alloy lead inner sheath 7 and the polyethylene inner sheath 8 are further extruded. The lead sheath has complete water impermeability and can reliably prevent the invasion of moisture and humidity. The sealing performance is good, and the corrosion resistance is good, and it is not afraid of seawater corrosion. The polyethylene sheath has excellent resistance and is an excellent seawater barrier. The molecular structure is compact, which can effectively prevent the penetration of moisture and effectively prevent the corrosion of the internal coated material.

[0054] The cores are stranded into a cable, and the water-blocking rubber filling layer 9 is used to fill the roundness. The cable core is tightened by the water-blocking tape 10. The water-blocking rubber can expand several times after encountering water, ensuring that the gap is completely filled and effectively preventing seawater from invading.

[0055] The polypropylene fiber layer 11 is wrapped outside the tape. This material has good acid and alkali resistance and high strength, and can withstand a large tensile force. Since the cable is laid in seawater, it bears more tension and gravity than on land. The use of polypropylene fiber can effectively prevent the expansion of the inner layer of the cable.

[0056] The polypropylene fiber layer 11 is further extruded with an alloy lead outer sheath 12 and a polyethylene inner pad layer 13. The alloy lead outer sheath 12 has good corrosion resistance and can resist the corrosion of seawater and salt mist. It provides good waterproof protection for the cable core and further improves the waterproof performance of the cable.

[0057] The polyethylene inner pad layer 13 is externally wrapped with a galvanized steel wire armor layer 14. The galvanized steel wire armor layer 14 uses steel wire as a reinforcing member for the cable, providing sufficient strength to withstand external forces when the cable is subjected to external forces, while protecting the inner layer of the cable. The steel wire armor layer is coated with asphalt, which has the characteristics of waterproofing, corrosion resistance, wear resistance, etc., improving the safety and durability of the cable.

[0058] The outermost layer is a polypropylene fiber outer sheath, which has high strength and wear resistance, and can effectively protect the cable from damage during installation and construction. The design of this cable uses a strong protective layer and excellent seawater-resistant material, which can work stably in a harsh seawater environment and ensure the reliability and stability of power transmission.

Claims

1. A 35 kV power cable for offshore wind power generation, characterized in that: The cable comprises a conductor, a semi-conductive water-blocking tape wrapped outside the conductor, a three-layer co-extruded insulation layer wrapped outside the semi-conductive water-blocking tape, a semi-conductive water-blocking tape wrapped outside the three-layer co-extruded insulation layer, an alloy lead inner sheath and a polyethylene inner sheath wrapped outside the semi-conductive water-blocking tape in sequence to form a core, the cores are twisted into a cable core, a water-blocking tape is wrapped outside the cable core to tighten the cable core, a polypropylene fiber layer is wrapped outside the water-blocking tape, an alloy lead outer sheath and a polyethylene inner cushion layer are wrapped outside the polypropylene fiber layer, a galvanized steel wire armor layer is wound outside the polyethylene inner cushion layer, and an outer sheath is wrapped outside the galvanized steel wire armor layer.

2. A 35 kV power cable for offshore wind power generation according to claim 1, characterized in that: The conductor is a copper core special-shaped conductor.

3. A 35 kV power cable for offshore wind power generation according to claim 1, characterized in that: The three-layer co-extruded insulation layer comprises an inner semi-conductive shielding layer, a cross-linked polyethylene insulation layer and an outer semi-conductive shielding layer in sequence from inside to outside.

4. The 35 kV power cable for offshore wind power generation according to claim 1, characterized in that: The cable core is filled with a water-blocking rubber filling layer to be round.

5. The 35 kV power cable for offshore wind power generation according to claim 1, characterized in that: The galvanized steel wire armor layer is coated with asphalt on the outside.

6. A 35 kV power cable for offshore wind power generation according to claim 1, characterized in that: The outer sheath is a polypropylene fiber outer sheath.

Images