Suspended power transmission system

Abstract

The utility model relates to a suspension type power transmission system, which relates to the field of offshore power transmission equipment, and comprises a cable and a tensile cable, wherein the cable is at least partially suspended in water and is used for conducting connection between two pieces of power equipment; two ends of the tensile cable are fixedly arranged, a plurality of connecting points are arranged between the tensile cable and the cable, and the length of the tensile cable between any two connecting points is smaller than that of the cable. By using the suspension assembly and the plurality of connection points between the tensile cable and the cable, the cable can suspend in water and has excellent tensile performance.

Description

Technical Field

[0001] The present application relates to the field of offshore power transmission equipment, and in particular to a suspended power transmission system. Background Art

[0002] At present, offshore photovoltaic is a new way of utilizing marine energy and developing resources. The offshore environment is different from that on land. Under the same lighting conditions, the open sea surface, no obstructions, long sunshine time and high radiation make the offshore photovoltaic project more efficient in utilizing light, and the power generation of offshore photovoltaic power stations is significantly improved.

[0003] The installation methods of transmission cables for offshore wind power or photovoltaic power generation are mainly divided into floating installation and bottom installation. The floating installation cable is a cable surface floating tube equipped with a buoy, which provides buoyancy so that the entire cable floats on the water surface. There are two forms of bottom installation cables, one is to place it directly on the seabed; the other is to dig a cable trench on the seabed, place the cable in the cable trench and then backfill it.

[0004] Floating cables will affect sea navigation, and floating objects on the sea may damage the cables; cables located on the seabed are prone to movement and friction with the seabed, causing damage; the installation method of digging cable trenches on the seabed requires special construction vessels, which has high construction costs. Utility Model Content

[0005] The present application provides a suspended power transmission system, which provides a cable that can be suspended in water and has excellent tensile strength.

[0006] The present application provides a suspended power transmission system, comprising a cable and a tensile cable; wherein the cable is at least partially suspended in water and is used for conductive connection between two power devices; both ends of the tensile cable are fixedly arranged, and there are multiple connection points between the tensile cable and the cable, and the length of the tensile cable between any two connection points is less than the length of the cable.

[0007] In the above technical solution, the cable suspended in the water is less damaged during daily use than the cables located on the water surface and the bottom of the water.

[0008] The two ends of the tensile cable are fixed to keep tension, and multiple connection points are set between the tensile cable and the cable for fixing, which improves the tensile performance of the cable. The length of the tensile cable between any two connection points is less than the length of the cable. When the tensile cable is straightened, the cable will not be under tension or will be under a small tension, thus protecting the cable and making the suspended power transmission system have excellent tensile performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of the structure of a cable, a suspension assembly, a tensile cable and a positioning assembly in an embodiment;

[0010] Figure 2 is a structural schematic diagram of the relationship between the cable and the positioning assembly in an embodiment;

[0011] Figure 3 The structure diagram of a cable in an embodiment is shown in FIG.

[0012] 1. Cable; 11. Cable body; 12. Connecting sleeve; 2. Suspension assembly; 21. Floating body; 211. First buoy; 212. Second buoy; 213. Third buoy; 22. Connecting rope; 3. Tensile cable; 4. Positioning assembly; 41. Fixing piece; 42. Anchor rope; 5. Power generation part; 6. Load part. DETAILED DESCRIPTION

[0013] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0014] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0015] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0016] The present application embodiment discloses a suspended power transmission system. Figure 1 , the cable 1 is used for conductive connection between two electric devices. The suspended power transmission system in this embodiment is used for conductive connection between the power generation part 5 in water and the load part 6 on land. In another embodiment, the suspended power transmission system can be used for conductive connection between two electric devices located in water.

[0017] In this embodiment, the power generation part 5 includes an offshore photovoltaic power station, which may also be an offshore wind power generation; the load part 6 includes a substation, which may also be an electrical device. The electric energy generated by the power generation part 5 is transmitted to the load part 6 through a suspended power transmission system. The offshore photovoltaic power station includes a power station located in a coastal beach area, where the water depth of the power station is less than five meters; or the offshore photovoltaic power station includes a power station located thirty kilometers offshore and within fifty meters in water depth.

[0018] Reference Figure 1 The suspended power transmission system comprises a cable 1, a suspension component 2 and a tensile cable 3. The cable 1 is at least partially suspended in water and is used for conductive connection between two power devices.

[0019] Both ends of the tensile cable 3 are fixedly arranged, and there are multiple connection points between the tensile cable 3 and the cable 1 . The length of the tensile cable 3 between any two connection points is less than the length of the cable 1 .

[0020] Reference Figure 1 Specifically, the two power devices are a power generation part 5 in water and a load part 6 on land, a cable 1 is conductively connected to the power generation part 5 and the load part 6, a portion of the cable 1 is located in water, and in this embodiment, the cable 1 located in water is suspended in water.

[0021] In the prior art, the cable 1 located at the bottom of the water moves under the impact of waves, and the friction between the cable 1 and the bottom of the water causes the cable 1 to wear out; the installation method of digging a cable trench at the bottom of the water requires a special construction ship, which has high construction costs. The cable 1 floating on the water surface may affect the navigation on the water surface on the one hand, and on the other hand, floating objects on the sea may accumulate on the cable 1, causing damage to the cable 1.

[0022] Compared with placing the cable 1 on the bottom of the water or floating on the water surface, the cable 1 is suspended in the water, and the cable 1 does not contact the bottom of the water or floating objects on the water surface. The installation cost of the cable 1 is low and the risk of damage to the cable 1 is small.

[0023] Since the overall density of the cable 1 is greater than that of water, the cable 1 will sink to the bottom of the water when placed in the water. The suspension component 2 is used to suspend the cable 1 in the water. The suspension component 2 converts the buoyancy it receives into an upward pulling force on the cable 1, so that the cable 1 is suspended in the water.

[0024] Reference Figure 1 The two ends of the tensile cable 3 are fixedly arranged, and there are multiple connection points between the tensile cable 3 and the cable 1. The length of the tensile cable 3 between any two connection points is less than the length of the cable 1.

[0025] The two ends of the tensile cable 3 are fixedly arranged, and the tensile performance of the tensile cable 3 is greater than the tensile performance of the cable 1. Exemplarily, one end of the tensile cable 3 is fixedly connected to the power generation part 5, and the other end is fixed on land. In another embodiment, the tensile cable 3 also has an intermediate support point, and the intermediate support point is fixedly connected to a column fixed on the bottom of the water.

[0026] It should be noted that, although both ends of the tension-resistant cable 3 are fixed, under the action of the water flow, the tension-resistant cable 3 can swing left and right with the water flow.

[0027] There are multiple connection points between the tensile cable 3 and the cable 1, each of which indicates that other components are used to connect the cable 1 and the tensile cable 3. For example, a stainless steel tie is used to connect the tensile cable 3 and the cable 1; optionally, a clamp is used to connect the tensile cable 3 and the cable 1. Several connection points are sequentially arranged at intervals along the length direction of the tensile cable 3 according to design requirements.

[0028] The length of the tensile cable 3 between any two connection points is less than the length of the cable 1. When the tensile cable 3 is in a straight state, the cable 1 will not be subjected to tension or will be subjected to a small tension, thereby protecting the cable 1.

[0029] Reference Figure 1 As an optional solution, the suspension assembly 2 includes a buoy 21 and a connecting rope 22. The buoy 21 floats on the water surface, the connecting rope 22 connects the buoy 21 and the cable 1, the length of the connecting rope 22 is less than the minimum water depth of the water area for placing the cable 1, and the buoy 21 applies tension to the cable 1 through the connecting rope 22, so that the cable 1 is suspended in the water.

[0030] Specifically, the density of the float 21 is less than that of water. Exemplarily, the float 21 is a buoy, part of the float 21 is located in the water, and part of it is located above the water surface. When the float 21 is connected to the cable 1 through the connecting rope 22, the buoyancy generated by the float 21 can keep the float 21 always located above the water surface.

[0031] Furthermore, in order to reduce the pulling force exerted by a single buoy 21 on the cable 1 through the connecting rope 22 , a plurality of buoys 21 are provided to be connected to the cable 1 .

[0032] One end of the connecting rope 22 is fixedly connected to the floating body 21, and the other end is fixedly connected to the cable 1. The length of the connecting rope 22 is less than the minimum water depth of the water area for placing the cable 1. The length of the connecting rope 22 can be understood as the distance between the upper end of the connecting rope 22 connected to the floating body 21 and the lowermost end of the cable 1 part connected to the connecting rope 22.

[0033] When the buoy 21 floats on the water, the upper end of the connecting rope 22 is connected to the buoy 21, and the lower end is connected to the cable 1. The cable 1 is located above the bottom of the water to avoid contact between the cable 1 and the bottom of the water, so that the cable 1 is suspended in the water.

[0034] Furthermore, the length of the connecting rope 22 is less than the minimum water depth of the water area for placing the cable 1, and the setting of the connecting rope 22 ensures that there is always a gap between the cable 1 located in the water body and the water bottom, that is, there is a gap between the lowest position of the cable 1 and the water bottom.

[0035] In another embodiment, the tensile cable 3 is a part of the main cable. The main cable includes two fixing positions, and the part between the two fixing positions is the tensile cable 3 .

[0036] The connection method among the connecting rope 22, the cable 1 and the tensile cable 3 is explained: the end of the connecting rope 22 fixedly connected to the cable 1 is directly connected to the cable 1, and the tensile cable 3 is fixedly connected to the cable 1; or the connecting rope 22 is fixedly connected to the tensile cable 3, and the tensile cable 3 is fixedly connected to the cable 1; or the cable 1 and the tensile cable 3 are connected to the connecting rope 22 at the same time.

[0037] Reference Figure 1 As an optional solution, it also includes a fixing member 41 and an anchor rope 42. The fixing member 41 is fixed to the bottom of the water; the anchor rope 42 connects the fixing member 41 and the cable 1 to make the cable 1 drift in a set area.

[0038] Specifically, the suspended power transmission system further includes a positioning component 4, which limits the cable 1 within a set area so that the cable 1 can only swing left and right within the set area.

[0039] The positioning assembly 4 includes a fixing member 41 and an anchor rope 42. The fixing member 41 is fixed to the bottom of the water. Exemplarily, the fixing member 41 includes an anchor rod fixed to the bottom of the water; optionally, the fixing member 41 includes a net bag loaded with stones.

[0040] One end of the anchor rope 42 is connected to the fixing member 41 , and the other end is fixedly connected to the cable 1 . The anchor rope 42 is a member whose length cannot be extended.

[0041] When the cable 1 swings left and right, the cable 1 swings synchronously with the end connected to the cable 1 with the anchor rope 42, and the fixing member 41 remains fixed. When the cable 1 swings left or right to the set position, the anchor rope 42 is in a tensioned state and cannot be extended. The anchor rope 42 applies a pulling force to the cable 1 to prevent the cable 1 from further deviating from the center position; wherein the center position is the position where the cable 1 does not swing left or right after installation, and the maximum swing distance of the cable 1 to the left is equal to the maximum swing distance of the cable 1 to the right.

[0042] Exemplarily, the positioning component 4 is located at the side portion of the cable 1. In another embodiment, the positioning component 4 is located directly below the cable 1.

[0043] Furthermore, the connection position between the positioning component 4 and the cable 1 coincides with the connection position between the suspension component 2 and the cable 1 .

[0044] The positioning assembly 4 can limit the movement of the cable 1 within a set area. The positioning assembly 4 is also used in conjunction with the tensile cable 3. The positioning assembly 4 and the tensile cable 3 limit the cable 1 in different directions, thereby improving the stability of the cable 1 in water and reducing the risk of damage to the cable 1.

[0045] Reference Figure 1As an optional solution, a plurality of fixing members 41 and anchor ropes 42 are provided, and the plurality of fixing members 41 and anchor ropes 42 correspond to each other one by one. The plurality of fixing members 41 include a plurality of fixing members 41 spaced apart along the length direction of the cable 1 .

[0046] Specifically, there are multiple positioning components 4, and the fixing members 41 and anchor ropes 42 of the positioning components 4 are arranged one by one. The multiple positioning components 4 include several positioning components 4 arranged at intervals along the length direction of the cable 1.

[0047] Specifically, the plurality of cables include a plurality of anchor ropes 42 spaced apart along the length direction of the cable 1, and the fixings 41 are arranged one by one corresponding to the anchor ropes 42. Exemplarily, the plurality of fixings 41 include a plurality of fixings 41 spaced apart along the length direction of the cable 1, and the distances of the fixings 41 to the cable 1 in a direction perpendicular to the length direction of the cable 1 and in a horizontal direction are equal; optionally, the distances of the fixings 41 to the cable 1 in a direction perpendicular to the length direction of the cable 1 and in a horizontal direction are different.

[0048] The provision of multiple fixing members 41 and anchor ropes 42 enables the cable 1 to be limited at multiple locations, thereby reducing the force exerted by a single positioning component 4 on the cable 1 .

[0049] Reference Figure 2 As an optional solution, the plurality of fixing members 41 include two groups of fixing members, each group of fixing members includes a plurality of fixing members 41 , and the two groups of fixing members are respectively arranged on both sides of the cable 1 .

[0050] Specifically, the plurality of fixing members 41 are divided into two groups of fixing members, which are respectively located on both sides of the cable 1, where both sides of the cable 1 refer to both sides of the cable 1 in the horizontal direction. The area where the cable 1 swings in the horizontal direction is located between the two groups of fixing members.

[0051] The arrangement of two sets of fixing members reduces the pulling force required when a single fixing member 41 limits the cable 1. When one set of fixing members fails, the other set of fixing members can still limit the cable 1.

[0052] Furthermore, two groups of fixing members located on both sides of the cable 1 are symmetrically arranged at the center position.

[0053] In another embodiment, the plurality of fixing members 41 are all disposed on the same side of the cable 1 .

[0054] Reference Figure 3 As an optional solution, the cable 1 includes a connecting sleeve 12 and a cable body 11 , the connecting sleeve 12 is sleeved on the cable body 11 and fixedly connected to the cable body 11 , and the suspension component 2 and the tensile cable 3 are connected to the connecting sleeve 12 .

[0055] Specifically, the cable body 11 includes an inner metal cable and an insulating protective sleeve wrapped around the outer side of the metal cable. The connecting sleeve 12 is sleeved on the outer side of the cable body 11. Exemplarily, the connecting sleeve 12 is a clamp.

[0056] During installation, the connecting sleeve 12 is sleeved on the outside of the cable body 11 , and the connecting sleeve 12 and the cable body 11 are pressed together using a bolt and nut assembly to achieve fixation between the connecting sleeve 12 and the cable body 11 .

[0057] The suspension assembly 2 , the tensile cable 3 and the anchor rope 42 are fixedly connected to the connecting sleeve 12 , thereby achieving a fixed connection with the cable 1 .

[0058] The provision of the connecting sleeve 12 can reduce excessive local pressure on the connection of the cable 1 when the cable 1 is connected to other components. The connecting sleeve 12 disperses the pressure to the cable body 11, reducing the risk of damage to the cable body 11.

[0059] Reference Figure 3 As an optional solution, the static friction between the connecting sleeve 12 and the cable body 11 is smaller than the pulling force when the cable 1 is broken.

[0060] Specifically, when installing the connecting sleeve 12, a torque wrench is used to install the bolt and nut assembly so that the clamping force between the connecting sleeve 12 and the cable body 11 is a set size. It should be noted that the clamping force can be within a certain range.

[0061] The static friction between the connecting sleeve 12 and the cable body 11 depends on the pressure between the connecting sleeve 12 and the cable body 11. By controlling the pressure between the connecting sleeve 12 and the cable body 11, the static friction between the connecting sleeve 12 and the cable body 11 is within a set range.

[0062] When water waves and debris exert force on cable 1 so that the tension on cable 1 exceeds a set value, the connecting sleeve 12 can slide relative to the cable body 11, thereby increasing the length of the portion of cable 1 located between the corresponding two connection points and reducing the risk of cable 1 being broken.

[0063] It should be noted that, in this embodiment, the length direction of the cable 1 is represented by the direction of the cable 1 when it is straightened at the middle position, and the length of the cable 1 is represented by the actual size of the cable 1.

[0064] Furthermore, the suspended power transmission system further includes a telescopic component, which is not shown in the attached drawings. The telescopic component is fixed on land, and one end of the tensile cable 3 fixed on land is connected to the telescopic component. The telescopic component can drive the end of the tensile cable 3 fixed on land to move, so as to adjust the length and tension state of the tensile cable 3 in the water. Exemplarily, the telescopic component includes a telescopic cylinder, a cylinder body is fixed on land, and a piston rod is fixedly connected to the tensile cable 3. Optionally, the telescopic component includes a drum, and one end of the tensile cable 3 fixed on land is fixedly connected to the drum, and the drum rotates to wind the tensile cable 3 around the drum.

[0065] Reference Figure 1 As an optional solution, the suspension assembly 2 includes a plurality of floats 21 and a plurality of connecting ropes 22 , the plurality of floats 21 correspond one to one with the plurality of connecting ropes 22 , and the plurality of connecting ropes 22 are arranged at intervals along the length direction of the cable 1 .

[0066] The arrangement of multiple floats 21 can reduce the upward pulling force exerted by a single float 21 on the cable 1, which is helpful for the arrangement of the float 21 and reduces the pulling force exerted locally on the cable 1. The arrangement of multiple floats 21 disperses the pulling force exerted by the suspension assembly 2 on the cable 1 to various parts of the cable 1, which helps to maintain the stability of the cable 1.

[0067] Furthermore, two adjacent floating bodies 21 are connected by a flexible rope.

[0068] Reference Figure 1 As an optional solution, the plurality of floating bodies 21 include a first floating body 211 , a second floating body 212 and a third floating body 213 .

[0069] The distance between the first buoy 211 and the second buoy 212 is greater than the distance between the second buoy 212 and the third buoy 213; the distances from the first buoy 211, the second buoy 212 and the third buoy 213 to the middle position gradually decrease, and the middle position is the position where the distances from the two ends of the tensile cable 3 are equal.

[0070] Specifically, the first float 211, the second float 212, the third float 213 and the middle position are sequentially arranged along the length direction of the cable 1, and the first float 211 and the second float 212, the second float 212 and the third float 213 are adjacent floats 21. The distances from the first float 211, the second float 212 and the third float 213 to the middle position are gradually reduced, which can make the entire cable 1 more stable under the force of the float 21.

[0071] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A suspended power transmission system, characterized in that: It includes cables and tensile cables; wherein, The cable is at least partially suspended in water and is used for conducting connection between at least two electrical devices; Both ends of the tensile cable are fixedly arranged, and there are a plurality of connection points between the tensile cable and the electrical cable. The length of the tensile cable between any two of the connection points is less than the length of the electrical cable.

2. The suspended power transmission system according to claim 1, characterized in that: It also includes a suspension assembly, which includes a float and a connecting rope; wherein, The buoy floats on the water surface, the connecting rope connects the buoy and the cable, and the buoy and the connecting rope are used to provide tension to the cable so that the cable is at least partially suspended in the water.

3. The suspended power transmission system according to claim 1, characterized in that: It also includes a fixing part and an anchor rope; wherein, The fixing part is fixed on the bottom of the water; the anchor rope connects the fixing part and the cable to make the cable drift in a set area.

4. The suspended power transmission system according to claim 3, characterized in that: A plurality of the fixing members and the anchor rope are provided, and the plurality of the fixing members and the anchor rope correspond to each other one by one. The plurality of the fixing members include a plurality of the fixing members spaced apart along the length direction of the cable.

5. The suspended power transmission system according to claim 4, characterized in that: The plurality of fixing members include two groups of fixing members, each group of fixing members includes a plurality of fixing members; the two groups of fixing members are respectively arranged on both sides of the cable in a one-to-one correspondence.

6. The suspended power transmission system according to claim 2, characterized in that: The cable comprises a connecting sleeve and a cable body, wherein the connecting sleeve is sleeved on the cable body and fixedly connected to the cable body; The suspension assembly and the tension-resistant cable are connected to the connecting sleeve.

7. The suspended power transmission system according to claim 6, characterized in that: The static friction force between the connecting sleeve and the cable body is smaller than the pulling force when the cable is broken.

8. The suspended power transmission system according to claim 2, characterized in that: The suspension assembly includes a plurality of the floating bodies and a plurality of the connecting ropes, and the plurality of the floating bodies correspond to the plurality of the connecting ropes one by one; the plurality of the floating bodies are arranged at intervals along the length direction of the cable.

9. The suspended power transmission system according to claim 8, characterized in that: The plurality of floating bodies include a first floating body, a second floating body and a third floating body; wherein, The distance between the first floating body and the second floating body is greater than the distance between the second floating body and the third floating body; The distances from the first buoy, the second buoy and the third buoy to a middle position gradually decrease, and the middle position is a position on the tensile cable where the distances from both ends of the tensile cable are equal.

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