Protective device for offshore wind power output transformer through flexible direct current

Abstract

The invention discloses a protection device for delivering offshore wind power out of a transformer through flexible direct current, and particularly relates to the technical field of power transmission protection, the protection device comprises a protection cylinder, a conversion assembly is arranged on the protection cylinder, the conversion assembly comprises a center lining arranged in the protection cylinder, and a plurality of extension rods are distributed on the outer side of the center lining; and one end of each extension rod is rotationally connected with a rotating sleeve. According to the invention, each first reinforcing pin can be in contact with the corresponding second reinforcing pin, so that the current transmitted by the wire connected to the second reinforcing pin can be shunted and transmitted through the second reinforcing pin and the first reinforcing pin, and the flexible DC power transmission greatly reduces the power transmission cost. Voltage conversion between power grids of different voltage levels is achieved, safety and efficiency of power transmission are ensured, power transmission between the power grids of different voltage levels is achieved through the converter, and the flexibility of a power system is improved.

Description

Technical Field

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

[0002] The offshore wind power flexible DC transmission transformer protection device is an electric power automation product that integrates multiple functions such as protection, monitoring, control, and communication, and is an important electrical unit that constitutes an intelligent switch cabinet. This protection device plays a vital role in the offshore wind power flexible DC transmission system. Its main function is to protect the transformer and ensure its safe and stable operation. The transformer protection device usually has a built-in protection library consisting of multiple standard protection programs, and has a complete collection function for the voltage and current analog and switch quantities of the primary equipment. These functions are realized by protecting sensors such as CT (current transformer), which can monitor the operating status of the transformer in real time.

[0003] Among them, it is found through searching that the patent with announcement number CN214590559U discloses an offshore wind power transmission transformer protection export system via flexible direct current, including an offshore wind farm, and also including: 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, the grid side and the valve side of the first transformer and the second transformer are both connected with AC circuit breakers, 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; 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 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

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an offshore wind power flexible direct current transmission transformer protection device, aiming to solve the problems raised in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: A protective device for an offshore wind power transformer via flexible direct current transmission includes a protective cylinder, on which a conversion assembly is arranged; The conversion assembly includes a central liner arranged in the protective tube, a plurality of extension rods are distributed on the outside of the central liner, and one end of each of the extension rods is rotatably connected to a rotating sleeve, one end of the rotating sleeve is hinged to a nylon block through an axle pin, two limit sleeves are arranged on one side of the nylon block, and each of the limit sleeves is provided with a first reinforcing pin; 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 with the through hole, and a spring is provided on the outer sleeve of the second reinforcing pin.

[0006] 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, and each first reinforcement pin can be respectively contacted with the corresponding second reinforcement pin, 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 transmission cost of electricity, 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. Optionally, in a possible implementation manner, a support ring is provided on the outer side of the center liner, and the support ring is installed on the center liner by bolts, and a plurality of electric push rods are distributed on the support ring, and a plurality of the 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 ball socket blocks, 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, protective rods are rotatably connected to both sides of the rotating sleeve by an axle pin, and one end of each protective rod extends to the nylon block, and wire harness holes are penetrated and opened on the extension rod and the center liner, and the wire harness holes are connected, a converter is provided in the middle of the center liner, a pressure plate is installed on the top of the center liner by bolts, and an acrylic transparent plate is clamped on the top of the protective cylinder; 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 shunting 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.

[0007] Technical effects and advantages of the present invention: When the rotating sleeve of the present invention rotates, the positions and angles of the limiting sleeve and the first reinforcing pins can be changed, and each first reinforcing pin can be respectively in contact with the corresponding second reinforcing pin, so that the current transmitted by the wire connected to the second reinforcing pin can be shunted and transmitted through the second reinforcing pin and the first reinforcing pin, and the flexible direct current transmission greatly reduces the transmission cost; The present invention realizes voltage conversion between power grids of different voltage levels by contacting each first reinforcement pin with the corresponding second reinforcement pin, so as to ensure the safety and efficiency of power transmission, and realizes power transmission between power grids of different voltage levels through the converter, thereby improving the flexibility of the power system; The present invention arranges the wire harness holes so that the converter combs different wires through each wire harness hole and connects them with the corresponding first reinforcing pins to ensure the stability of the current during shunting 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, so that when the output end of the electric push rod is extended, the ball and socket block and the traction block drive the traction rod to deflect, and the interference between the various structures is staggered, so that the various structures are easy to be linked; In summary, through the corresponding coordinated use of various structures, each first reinforcement pin can be respectively contacted with the corresponding second reinforcement pin, 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

[0008] In order to more clearly illustrate the technical solutions in 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. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not intended to limit the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0009] Figure 1 It is the front view of the overall structure of the present invention.

[0010] Figure 2 It is a top view of the overall structure of the present invention.

[0011] Figure 3 It is a three-dimensional diagram of the conversion assembly of the present invention.

[0012] Figure 4 For the present invention Figure 3 Side view of.

[0013] Figure 5 It is a stereoscopic diagram of the rotating sleeve, the extension rod, the nylon block, the limiting sleeve and the first reinforcing pin of the present invention.

[0014] Figure 6 It is a three-dimensional diagram of the backing plate, the wire harness tube, the spring and the second reinforcing pin of the present invention.

[0015] Figure 7 It is a stereoscopic diagram of the electric push rod, the ball and socket block and the traction block of the present invention.

[0016] The accompanying drawings are marked as follows: 1. protective tube; 2. center lining; 3. extension rod; 4. rotating sleeve; 5. nylon block; 6. limiting 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

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0018] As attached Figure 1 - Figure 7The offshore wind power is sent out through the flexible direct current transformer protection device shown. Through the conversion component set on the protective tube 1, each first reinforcement pin 7 can be respectively in contact 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. The flexible direct current transmission greatly reduces the transmission cost of electricity, realizes voltage conversion between power grids of different voltage levels, so as to ensure the safety and efficiency of power transmission. The power transmission between power grids of different voltage levels is realized through the converter 19, which improves the flexibility of the power system, and the specific structure of the component is set as follows; The conversion assembly includes a central liner 2 arranged in a protective tube 1, a plurality of extension rods 3 are distributed on the outside of the central liner 2, and one end of each extension rod 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, two limit sleeves 6 are arranged on one side of the nylon block 5, and each limit sleeve 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 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 pins 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, and a spring 11 is provided on the outer sleeve of the second reinforcing pin 10.

[0019] A support ring 12 is provided on the outer side of the center liner 2, and the support ring 12 is installed on the center liner 2 by bolts. A plurality of electric push rods 13 are distributed on the support ring 12, and the plurality of electric push rods 13 are rotatably connected to the support ring 12 by an axle pin. The output ends of the plurality of electric push rods 13 are rotatably connected to ball socket blocks 14, and a traction block 15 is fixedly provided on one side of the plurality of ball socket blocks 14, and one end of each traction block 15 is rotatably connected to a traction rod 16 by 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. Protective rods 17 are rotatably connected to both sides of the rotating sleeve 4 by an axle pin, and one end of each protective rod 17 extends to the nylon block 5. Cable holes 18 are penetrated and opened on the extension rod 3 and the center liner 2, and the cable 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, and an acrylic transparent plate 21 is clamped on the top of the protective tube 1.

[0020] According to the above structure, when in use, the staff installs the invention at the designated position. When performing line conversion, the electric push rod 13 is started to drive the ball 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 through 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, and 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, and the flexible direct current transmission greatly reduces the transmission cost of electricity; And by contacting each first reinforcement pin 7 with the corresponding second reinforcement pin 10, voltage conversion between power grids of different voltage levels is realized to ensure the safety and efficiency of power transmission, and power transmission between power grids of different voltage levels is realized through the converter 19, thereby improving the flexibility of the power system; By setting the wiring harness holes 18, the converter 19 can comb different wires through each wiring harness hole 18 and connect them with the corresponding first reinforcing pins 7 to ensure the stability of current during shunting 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, so that 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 the interference between the various structures is staggered, which makes it easy for the various structures to be linked.

[0021] Different from the prior art, the present application discloses a transformer protection device for offshore wind power transmission via flexible direct current. Each first reinforced pin 7 can be respectively contacted with the corresponding second reinforced pin 10, so that the current transmitted by the wire connected to the second reinforced pin 10 can be shunted and transmitted through the second reinforced pin 10 and the first reinforced pin 7. 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 the converter 19, thereby improving the flexibility of the power system.

[0022] 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 protection scope of the present invention.

Claims

1. A transformer protection device for transmitting offshore wind power via flexible direct current, comprising a protective tube (1), characterized in that: The protective tube (1) is provided with a conversion assembly; The conversion assembly comprises a central liner (2) arranged in a protective tube (1), a plurality of extension rods (3) are distributed on the outer side of the central liner (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) via an axle pin, two limit sleeves (6) are arranged on one side of the nylon block (5), and each of the limit 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. One end of the wire harness tube (8) is provided with two second reinforcing pins (10).

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

3. The offshore wind power flexible direct current transmission transformer protection device according to claim 2 is characterized in that: The pad (9) is provided with two through holes, 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 direct current transmission transformer protection device according to claim 1 is characterized in that: A support ring (12) is sleeved on the outer side of the central liner (2); the support ring (12) is mounted on the central liner (2) by means of bolts; and a plurality of electric push rods (13) are distributed on the support ring (12).

5. The offshore wind power flexible direct current transmission transformer protection device according to claim 4 is characterized in that: 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 socket block (14).

6. The offshore wind power flexible direct current transmission transformer protection device according to claim 4 is characterized in that: A traction block (15) is fixedly provided on one side of each of the plurality of ball and socket blocks (14), and one end of each of the traction blocks (15) is rotatably connected to a traction rod (16) via an axle pin.

7. The offshore wind power flexible direct current transmission transformer protection device according to claim 6 is characterized by: 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).

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

9. The offshore wind power flexible direct current transmission transformer protection device according to claim 1 is characterized by: The extension rod (3) and the central liner (2) are both provided with cable harness holes (18) extending therethrough, and the cable harness holes (18) are interconnected.

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

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