Offshore wind power transmission transformer protection device via flexible DC

Abstract

The present invention discloses a transformer protection device for offshore wind power transmission via flexible direct current, specifically relating to the field of power transmission protection technology, comprising a protective tube, a conversion assembly provided on the protective tube, the conversion assembly comprising a central lining provided within the protective tube, a plurality of extension rods distributed on the outer side of the central lining, and a rotating sleeve rotatably connected to one end of each extension rod. The present invention enables each first reinforcement pin to contact the corresponding second reinforcement pin respectively, thereby enabling the current transmitted by the wire connected to the second reinforcement pin to be shunted and transmitted via the second reinforcement pin and the first reinforcement pin. Flexible direct current transmission significantly reduces the cost of power transmission, realizes voltage conversion between power grids of different voltage levels, thereby ensuring the safety and efficiency of power transmission, realizes power transmission between power grids of different voltage levels through the converter, and improves the flexibility of the power system.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission protection, and more specifically, to a transformer protection device for offshore wind power transmission via flexible direct current. Background Art

[0002] Transformer protection devices for offshore wind power transmission via flexible DC transmission are power automation products that integrate multiple functions, including protection, monitoring, control, and communication. They are key electrical components of intelligent switchgear. These devices play a crucial role in offshore wind power flexible DC transmission systems, primarily protecting transformers and ensuring their safe and stable operation. Transformer protection devices typically include a built-in library of standard protection programs and provide comprehensive data collection capabilities for primary equipment voltage and current analog and switching values. These functions are implemented using sensors such as protection CTs (current transformers), enabling real-time monitoring of the transformer's operating status.

[0003] Among them, a search revealed that patent publication number CN214590559U discloses a system for protecting an offshore wind power export transformer via a flexible direct current transmission system, comprising an offshore wind farm, a first transformer, a second transformer, an AC circuit breaker, an offshore flexible direct current converter, and a DC submarine cable; the first transformer and the second transformer are both three-phase, three-winding connection transformers; the first transformer and the second transformer are connected in parallel, and both the grid side and valve side of the first transformer and the second transformer are connected to an AC circuit breaker; the grid-side AC circuit breakers of the first transformer and the second transformer are connected to the offshore wind farm, and the valve-side AC circuit breakers of the first transformer and the second transformer are connected to the offshore flexible direct current converter;

[0004] When in use, this structure is connected to the DC submarine cable connected to the onshore flexible DC converter through the output end of the offshore flexible DC converter, reducing the footprint and construction cost of the offshore station and improving operational reliability and availability during faults. However, this structure is not easy to convert different lines when in use, and voltage conversion is required between power grids of different voltage levels, resulting in low safety and efficiency of power transmission and low flexibility of the power system. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a protection device for an offshore wind power flexible direct current transmission transformer, aiming to solve the problems raised in the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a protective device for an offshore wind power transformer via flexible direct current transmission, comprising a protective cylinder, on which a conversion assembly is provided;

[0007] The conversion assembly includes a central liner disposed in a protective tube, a plurality of extension rods are distributed on the outside of the central liner, and one end of each extension rod is rotatably connected to a rotating sleeve, one end of the rotating sleeve is hinged to a nylon block via an axle pin, and two limit sleeves are provided on one side of the nylon block, and each limit sleeve is provided with a first reinforcing pin;

[0008] A wire harness tube is provided at the bottom of the limiting sleeve, and the wire harness tube is installed on the bottom of the inner wall of the protective tube by bolts. Two second reinforcing pins are provided at one end of the wire harness tube, and a pad is provided between the wire harness tube and the second reinforcing pins. The pad is clamped on the wire harness tube, and two through holes are penetrated by the pad, and each of the second reinforcing pins extends into the corresponding through hole and is slidably connected to the through hole. A spring is provided on the outer sleeve of the second reinforcing pin.

[0009] It can be seen that in the above technical solution, the traction force of the rotating sleeve when the traction rod is displaced rotates along the axis point of the connection between the rotating sleeve and the extension rod. When the rotating sleeve rotates, the position and angle of the limit sleeve and the first reinforcement pin are changed. Each first reinforcement pin can be in contact with the corresponding second reinforcement pin respectively, so that the current transmitted by the wire connected to the second reinforcement pin can be shunted and transmitted through the second reinforcement pin and the first reinforcement pin. The flexible direct current transmission greatly reduces the cost of power transmission, and through the contact between each first reinforcement pin and the corresponding second reinforcement pin, voltage conversion between power grids of different voltage levels is realized to ensure the safety and efficiency of power transmission. Power transmission between power grids of different voltage levels is realized through the converter, which improves the flexibility of the power system.

[0010] Optionally, in a possible embodiment, the outer sleeve of the center liner is provided with a support ring, the support ring is mounted on the center liner by bolts, and a plurality of electric push rods are distributed on the support ring, and the plurality of electric push rods are rotatably connected to the support ring by an axle pin, and the output ends of the plurality of electric push rods are rotatably connected to a ball socket block, a traction block is fixedly provided on one side of the plurality of ball socket blocks, and one end of each traction block is rotatably connected to a traction rod by an axle pin, one end of the traction rod extends to the outside of the rotating sleeve and is fixedly connected to the rotating sleeve, and both sides of the rotating sleeve are rotatably connected to a protective rod by an axle pin, and one end of each protective rod extends to the nylon block, and the extension rod and the center liner are both penetrated by a wire harness hole, and the wire harness holes are connected, a converter is provided in the middle of the center liner, a pressure plate is mounted on the top of the center liner by bolts, and an acrylic transparent plate is clamped on the top of the protective cylinder;

[0011] It can be seen that in the above technical solution, through the setting of the wire bundle holes, the converter can comb different wires through each wire bundle hole and connect them with the corresponding first reinforcement pins to ensure the stability of the current during diversion and transmission. At the same time, the electric push rod is rotatably connected to the support ring, and the output end of the electric push rod is rotatably connected to the ball and socket block, which makes it easy for the output end of the electric push rod to extend, so that the ball and socket block and the traction block drive the traction rod to deflect, and stagger the interference between the various structures, which makes it easy for the various structures to be linked.

[0012] Technical effects and advantages of the present invention:

[0013] When the rotating sleeve of the present invention rotates, the position and angle of the limiting sleeve and the first reinforcement pins can be changed, and each first reinforcement pin can respectively contact the corresponding second reinforcement pin. Then, the current carried by the wire connected to the second reinforcement pin can be divided and transmitted through the second reinforcement pin and the first reinforcement pin. Flexible direct current transmission significantly reduces the transmission cost.

[0014] The present invention achieves voltage conversion between power grids of different voltage levels by connecting each first reinforcement pin to the corresponding second reinforcement pin, thereby ensuring the safety and efficiency of power transmission. The converter enables power transmission between power grids of different voltage levels, thereby improving the flexibility of the power system.

[0015] The present invention provides a wiring harness hole so that the converter can comb different wires through each wiring harness hole and connect them to the corresponding first reinforcement pins to ensure the stability of current diversion and transmission. At the same time, the electric push rod is rotatably connected to the support ring, and the output end of the electric push rod is rotatably connected to the ball and socket block. When the output end of the electric push rod extends, the ball and socket block and the traction block drive the traction rod to deflect, and the interference between the various structures is staggered, making it easy for the various structures to be linked.

[0016] To sum up, through the corresponding coordinated use of various structures, each first reinforcement pin can be in contact with the corresponding second reinforcement pin respectively, so that the current transmitted by the wire connected to the second reinforcement pin can be shunted and transmitted through the second reinforcement pin and the first reinforcement pin. Flexible direct current transmission greatly reduces the cost of power transmission, realizes voltage conversion between power grids of different voltage levels to ensure the safety and efficiency of power transmission, and realizes power transmission between power grids of different voltage levels through converters, thereby improving the flexibility of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0018] Figure 1 It is the main view of the overall structure of the present invention.

[0019] Figure 2 It is a top view of the overall structure of the present invention.

[0020] Figure 3 It is a three-dimensional diagram of the conversion component of the present invention.

[0021] Figure 4 For the present invention Figure 3 side view.

[0022] Figure 5 It is a three-dimensional diagram of the rotating sleeve, extension rod, nylon block, limiting sleeve and first reinforcing pin of the present invention.

[0023] Figure 6 This is a three-dimensional diagram of the backing plate, wire harness tube, spring and second reinforcing pin of the present invention.

[0024] Figure 7 It is a three-dimensional diagram of the electric push rod, ball and socket block and traction block of the present invention.

[0025] The accompanying drawings are marked as follows: 1. Protective tube; 2. Center lining; 3. Extension rod; 4. Rotating sleeve; 5. Nylon block; 6. Limit sleeve; 7. First reinforcing pin; 8. Cable bundle tube; 9. Pad; 10. Second reinforcing pin; 11. Spring; 12. Support ring; 13. Electric push rod; 14. Ball and socket block; 15. Traction block; 16. Traction rod; 17. Protective rod; 18. Cable bundle hole; 19. Converter; 20. Pressure plate; 21. Acrylic transparent plate. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] As attached Figure 1 - Figure 7The offshore wind power is transmitted through a flexible direct current transformer protection device shown. Through the conversion component provided on the protective tube 1, each first reinforcement pin 7 can respectively contact the corresponding second reinforcement pin 10, thereby allowing the current transmitted by the wire connected to the second reinforcement pin 10 to be shunted and transmitted through the second reinforcement pin 10 and the first reinforcement pin 7. Flexible direct current transmission significantly reduces the cost of power transmission, realizes voltage conversion between power grids of different voltage levels, and ensures the safety and efficiency of power transmission. Power transmission between power grids of different voltage levels is achieved through the converter 19, thereby improving the flexibility of the power system. The specific structural configuration of the component is as follows;

[0028] The conversion assembly includes a central liner 2 disposed within a protective tube 1. Several extension rods 3 are distributed on the outside of the central liner 2. One end of each extension rod 3 is rotatably connected to a rotating sleeve 4. One end of the rotating sleeve 4 is hingedly connected to a nylon block 5 via an axle pin. Two limiting sleeves 6 are provided on one side of the nylon block 5, and each limiting sleeve 6 is provided with a first reinforcing pin 7.

[0029] A wire harness tube 8 is provided at the bottom of the limiting sleeve 6, and the wire harness tube 8 is installed on the bottom of the inner wall of the protective tube 1 by bolts. Two second reinforcing pins 10 are provided at one end of the wire harness tube 8, and a pad 9 is provided between the wire harness tube 8 and the second reinforcing pin 10. The pad 9 is clamped on the wire harness tube 8, and two through holes are penetrated on the pad 9, and each second reinforcing pin 10 extends into the corresponding through hole and is slidably connected with the through hole. A spring 11 is provided on the outer sleeve of the second reinforcing pin 10.

[0030] The outer sleeve of the center liner 2 is provided with a support ring 12, which is installed on the center liner 2 by bolts. Several electric push rods 13 are distributed on the support ring 12, and multiple electric push rods 13 are rotatably connected to the support ring 12 by axle pins. The output ends of multiple electric push rods 13 are rotatably connected to ball and socket blocks 14. A traction block 15 is fixedly provided on one side of the multiple ball and socket blocks 14, and one end of each traction block 15 is rotatably connected to a traction rod 16 by axle pin. One end of the traction rod 16 extends to the outside of the rotating sleeve 4 and is fixedly connected to the rotating sleeve 4. Protective rods 17 are rotatably connected to both sides of the rotating sleeve 4 by axle pins, and one end of each protective rod 17 extends to the nylon block 5. Wire harness holes 18 are penetrated by the extension rod 3 and the center liner 2, and the wire harness holes 18 are connected. A converter 19 is provided in the middle of the center liner 2, and a pressure plate 20 is installed on the top of the center liner 2 by bolts. An acrylic transparent plate 21 is clamped on the top of the protective tube 1.

[0031] According to the above structure, when in use, the staff installs the invention at a designated position. When performing line conversion, the electric push rod 13 is started to drive the ball and socket block 14 and the traction block 15 to drive the traction rod 16 to move, so that the rotating sleeve 4 can rotate along the axis point of the connection between the rotating sleeve 4 and the extension rod 3 due to the traction force when the traction rod 16 moves. When the rotating sleeve 4 rotates, the position and angle of the limit sleeve 6 and the first reinforcement pin 7 are changed. Each first reinforcement pin 7 can respectively contact the corresponding second reinforcement pin 10, so that the current transmitted by the wire connected to the second reinforcement pin 10 can be shunted and transmitted through the second reinforcement pin 10 and the first reinforcement pin 7. The flexible direct current transmission significantly reduces the transmission cost of electricity.

[0032] Furthermore, by connecting each first reinforcement pin 7 to the corresponding second reinforcement pin 10, voltage conversion between power grids of different voltage levels is achieved to ensure the safety and efficiency of power transmission. Power transmission between power grids of different voltage levels is achieved through the converter 19, thereby improving the flexibility of the power system.

[0033] Through the setting of the bundle holes 18, the converter 19 combs different wires through each bundle hole 18 and connects them with the corresponding first reinforcement pins 7 to ensure the stability of the current during diversion and transmission. At the same time, the electric push rod 13 is rotatably connected to the support ring 12, and the output end of the electric push rod 13 is rotatably connected to the ball and socket block 14. When the output end of the electric push rod 13 is extended, the ball and socket block 14 and the traction block 15 drive the traction rod 16 to deflect, and stagger the interference between the various structures, which facilitates the linkage of the various structures.

[0034] Different from the existing technology, the present application discloses a transformer protection device for offshore wind power transmission via flexible direct current. Each first reinforcement pin 7 can be respectively contacted with the corresponding second reinforcement pin 10, so that the current transmitted by the wire connected to the second reinforcement pin 10 can be shunted and transmitted through the second reinforcement pin 10 and the first reinforcement pin 7. Flexible direct current transmission greatly reduces the cost of power transmission and realizes voltage conversion between power grids of different voltage levels to ensure the safety and efficiency of power transmission. Power transmission between power grids of different voltage levels is realized through the converter 19, thereby improving the flexibility of the power system.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A protective device for an offshore wind power transformer via flexible direct current transmission, comprising a protective tube (1), characterized in that: The protective tube (1) is provided with a conversion assembly; The conversion assembly includes a central lining (2) arranged in a protective tube (1); a plurality of extension rods (3) are distributed on the outside of the central lining (2), and one end of each of the extension rods (3) is rotatably connected to a rotating sleeve (4), one end of the rotating sleeve (4) is hinged to a nylon block (5) through an axle pin, and two limiting sleeves (6) are provided on one side of the nylon block (5), and each of the limiting sleeves (6) is provided with a first reinforcing pin (7); A wire harness tube (8) is provided at the bottom of the limiting sleeve (6), and the wire harness tube (8) is mounted on the bottom of the inner wall of the protective tube (1) by means of bolts, and one end of the wire harness tube (8) is provided with two second reinforcing pins (10); The outer side of the central lining (2) is provided with a support ring (12), the support ring (12) is mounted on the central lining (2) by means of bolts, and a plurality of electric push rods (13) are distributed on the support ring (12); The plurality of electric push rods (13) are all rotatably connected to the support ring (12) via an axle pin, and the output ends of the plurality of electric push rods (13) are all rotatably connected to a ball and socket block (14); A traction block (15) is fixedly provided on one side of the plurality of ball and socket blocks (14), and one end of each traction block (15) is rotatably connected to a traction rod (16) via an axle pin; One end of the traction rod (16) extends to the outside of the rotating sleeve (4) and is fixedly connected to the rotating sleeve (4).

2. The offshore wind power flexible DC transmission transformer protection device according to claim 1 is characterized by: A backing plate (9) is provided between the wire bundle tube (8) and the second reinforcing pin (10), and the backing plate (9) is clamped on the wire bundle tube (8).

3. The offshore wind power flexible DC transmission transformer protection device according to claim 2 is characterized by: Two through holes are formed through the pad (9), and each of the second reinforcing pins (10) extends into a corresponding through hole and is slidably connected to the through hole. A spring (11) is sleeved on the outer side of the second reinforcing pin (10).

4. The offshore wind power flexible DC transmission transformer protection device according to claim 1 is characterized by: Both sides of the rotating sleeve (4) are rotatably connected to protective rods (17) via axle pins, and one end of each protective rod (17) extends to the nylon block (5).

5. The offshore wind power flexible DC transmission transformer protection device according to claim 1 is characterized in that: The extension rod (3) and the central lining (2) are both provided with wire harness holes (18), and the wire harness holes (18) are interconnected.

6. The offshore wind power flexible DC transmission transformer protection device according to claim 1 is characterized by: A converter (19) is provided in the middle of the central lining (2), a pressure plate (20) is mounted on the top of the central lining (2) via bolts, and an acrylic transparent plate (21) is clamped on the top of the protective tube (1).

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