A high-voltage inflatable cabinet for offshore wind power

Abstract

The present invention discloses a high-voltage gas filling cabinet for offshore wind power, which solves the problem of existing gas filling cabinets that if higher voltages and power supply requirements of more equipment need to be met, the number of gas filling cabinets needs to be increased, resulting in a relatively cumbersome transportation and assembly process. The gas filling cabinet includes a main cabinet; the main cabinet is filled with SF6 gas; three groups of first three-position switches, three circuit breaker sealed poles, three groups of first busbars and three groups of second three-position switches are arranged from top to bottom in the main cabinet, and the above devices are electrically connected by connecting conductors; three first inlet and outlet bushings connected to the three groups of first three-position switches and three second inlet and outlet bushings connected to the three groups of second three-position switches are arranged on the side wall of the main cabinet, and the gas filling cabinet can also realize parallel connection of multiple cabinets through connectors.

Description

Technical Field

[0001] The present invention relates to the field of electric power, and in particular to a high-voltage gas filling cabinet for offshore wind power. Background Art

[0002] Faced with common human challenges such as energy shortages, environmental pollution, and climate change, clean energy has become the main development direction in the industry. Currently, offshore wind power projects are mainly based on a 40.5kV system voltage. Due to the limited space of offshore wind power projects, in order to reduce the number of wind turbine circuits, save space in offshore substations, and reduce investment and operation and maintenance costs, offshore wind power has gradually increased from 40.5kV to a 72.5kV system. The 72.5kV gas-insulated metal-enclosed switchgear inside wind towers is also becoming more and more widely used.

[0003] However, current gas cabinets are divided into three sections based on the principle of incoming and outgoing lines, and each cabinet can only serve one device. If higher voltages and the power supply requirements of more devices are required, more gas cabinets will be needed. However, since adding a single gas cabinet would occupy the already compact space, this may not be feasible.

[0004] Furthermore, offshore wind power plants face harsh environmental conditions, making maintenance and replacement difficult. This places extremely high demands on product protection against moisture, corrosion, mold, and salt spray. Existing conventional inflatable cabinets currently require significant improvement and enhancement in these areas. In particular, the internal high-voltage insulation and external sealing of switchgear when combined in cabinets cannot meet the long-term operational requirements of the current offshore environment. Summary of the Invention

[0005] In order to solve the problem that the existing gas filling cabinets need to increase the number of gas filling cabinets if higher voltage and power supply requirements of more equipment are to be met, resulting in complicated transportation and assembly processes, the present invention proposes a high-voltage gas filling cabinet for offshore wind power.

[0006] The specific technical solutions of the present invention are as follows:

[0007] A high-voltage inflatable cabinet for offshore wind power generation, comprising a main cabinet;

[0008] The main cabinet includes a main cabinet body, a first three-position switch, a first inlet and outlet bushing, a circuit breaker sealed pole, a first connecting conductor, a second connecting conductor, a first busbar, a third connecting conductor, a second three-position switch, a fourth connecting conductor and a second inlet and outlet bushing;

[0009] The main cabinet is filled with SF6 gas;

[0010] The first three-position switches are in three groups and are arranged side by side on the upper part of the main cabinet along the width direction of the main cabinet;

[0011] There are three first inlet and outlet bushings, which are arranged side by side on the upper side wall of the main cabinet along the width direction of the main cabinet, and each first inlet and outlet bushing is electrically connected to the conductive static contact of each group of the first three-position switches;

[0012] The circuit breaker sealed pole is located in the main cabinet and below the first three-position switch. The circuit breaker sealed pole is electrically connected to the middle position support of each group of the first three-position switch through three first connecting conductors.

[0013] There are three groups of first busbars, which are arranged side by side inside the main cabinet along the depth direction of the main cabinet and below the sealed poles of the circuit breaker; each first busbar is electrically connected to the sealed pole of the circuit breaker via a second connecting conductor;

[0014] The second and third position switches are arranged in three groups and arranged side by side in the lower part of the main cabinet along the width direction of the main cabinet; each first busbar is electrically connected to the conductive static contact of each group of the second and third position switches through a third connecting conductor;

[0015] The middle station support of each group of second three-station switches is electrically connected to a second inlet and outlet bushing via a fourth connecting conductor;

[0016] There are three second inlet and outlet bushings, which are arranged side by side on the lower side wall of the main cabinet along the width direction of the main cabinet.

[0017] Furthermore, the above-mentioned inflatable cabinet further comprises at least one side cabinet installed side by side on the left or right side of the main cabinet along the width direction of the main cabinet;

[0018] The side cabinet includes a side cabinet body, a second busbar, a third three-position switch, a fifth connecting conductor, a sixth connecting conductor and a third inlet and outlet bushing;

[0019] The side cabinet is filled with SF6 gas;

[0020] The second busbars have the same structure and number as the first busbars, and are at the same height as the first busbars. The three groups of first busbars correspond to the three groups of second busbars one by one. The corresponding first busbars and second busbars are electrically connected through connectors, thereby realizing the electrical connection between the main cabinet and the side cabinet.

[0021] The third three-position switches are arranged in three groups and arranged side by side at the lower part of the side cabinet along the width direction of the side cabinet; each second busbar is electrically connected to each group of the third three-position switches via a fifth connecting conductor;

[0022] Each group of third three-position switches is electrically connected to a third inlet and outlet bushing via a sixth connecting conductor;

[0023] There are three third inlet and outlet bushings, which are arranged side by side on the lower side wall of the side cabinet along the width direction of the side cabinet.

[0024] Furthermore, the connector includes a side expansion sleeve, an insulating member and a conductive tube;

[0025] There are two side expansion sleeves, which are installed on the side wall of the main cabinet and the side cabinet respectively;

[0026] Each side expansion sleeve includes a metal conductive head and an insulating sleeve; the metal conductive head is embedded in the insulating sleeve; one end of the metal conductive head extends outside the insulating sleeve for connecting to the first busbar or the second busbar, and the other end is located inside the insulating sleeve and is provided with a first blind hole; a second blind hole is provided in the insulating sleeve, and the second blind hole and the first blind hole are coaxial, and the aperture of the second blind hole is larger than that of the first blind hole;

[0027] The two ends of the conductive tube are respectively inserted into the first blind holes of the two side expansion sleeves; an insulating piece is installed between the conductive tube and the second blind hole of the insulating sleeve.

[0028] Furthermore, both ends of the conductive tube are electrically connected to the metal conductive head via conductive contacts.

[0029] Furthermore, the second blind hole is a tapered hole, and the insulating member is in a frustum shape as a whole, so that the insulating member and the insulating sleeve form a conical fit.

[0030] Furthermore, the connector further comprises a sealing and grounding structure, the sealing and grounding structure comprising a sealing ring and an O-shaped metal ring; the insulating sleeve is provided with a sealing ring groove on an end surface away from the metal conductive head, and the sealing ring is installed in the sealing ring groove;

[0031] An O-shaped metal ring is installed on the outer surface of the middle area of ​​the insulating member, and the O-shaped metal ring is grounded through a wire.

[0032] Furthermore, the above connector also includes a positioning pin, and the insulating sleeve has a plurality of positioning pin holes evenly arranged along the circumference on the end face away from the metal conductive head, and positioning pins are provided between the plurality of positioning pin holes on the two side expansion sleeves.

[0033] Furthermore, the insulating sleeve is provided with a creepage-enhancing structure at one end close to the metal conductive head.

[0034] Furthermore, the insulating pillars of the first three-position switch, the second three-position switch, and the third three-position switch are all provided with a climbing structure.

[0035] Furthermore, the insulating member is made by epoxy resin casting or rubber vulcanization process.

[0036] Compared with the prior art, the beneficial effects are as follows:

[0037] 1. The main cabinet of the present invention rearranges the electrical components inside the cabinet. Compared with the existing 66kV single cabinet that needs to be divided into three parts, the structure is more compact, occupies a smaller area, and is more convenient for maintenance and transportation. In addition, the present invention provides a climbing structure on the insulating pillars of the three-position switch, meeting the requirement that a single cabinet can provide higher voltage.

[0038] 2. The present invention can simultaneously expand multiple side cabinets on one side or both sides of the main cabinet through connectors, thereby realizing one incoming line and multiple outgoing lines, meeting the demand for simultaneous power supply of multiple devices.

[0039] 3. The present invention forms a connector connecting the main cabinet and the side cabinet through a side expansion sleeve, a conductive tube and an insulating part, and the insulating part and the two side expansion sleeves are matched with a conical surface, which is not only convenient for assembly and has good sealing, but also avoids the occurrence of a discharge channel between the insulating part and the side expansion sleeve, and greatly improves the pressure resistance performance.

[0040] 4. The present invention realizes electrical connection between the conductive tube and the first busbar and the second busbar through conductive contacts, which has the advantages of convenient on-site installation and reliable conductive performance.

[0041] 5. In the connector of the present invention, sealing rings are provided on the insulating sleeves of the two side expansion sleeves, and an O-type metal ring is provided in the middle area of ​​the insulating part (i.e., the position corresponding to the two side expansion sleeves). This not only prevents moisture and salt spray from penetrating into the conductive tube and the insulating parts inside the cabinet through the gap between the two cabinets, causing damage or corrosion to the conductive tube and the insulating parts inside the cabinet, but also achieves the purpose of moisture-proof, corrosion-proof, mildew-proof and salt spray-proof of the inflatable cabinet. At the same time, the O-type metal ring is grounded through the wire to ensure reliable insulation of the connector.

[0042] 6. In the connector of the present invention, a creepage-increasing structure is provided at one end of the insulating sleeve of the side expansion sleeve, which increases the creepage distance without occupying the internal space of the cabinet, so that the inflatable cabinet can reach the electrical insulation level of high voltage (66KV).

[0043] 7. The present invention uses positioning pins in the connector to achieve positioning, ensuring the reliability when two cabinets are connected in parallel and the concentricity of the connector itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the main cabinet structure in Example 1;

[0045] Figure 2 This is a schematic diagram of the side structure of the main cabinet in Example 1;

[0046] Figure 3 This is a front view structural diagram of Example 2;

[0047] Figure 4This is a side structural diagram of the side cabinet in Example 2;

[0048] Figure 5 Schematic diagram of the cross-sectional structure of the connector;

[0049] Figure 6 It is a schematic diagram of the cross-sectional structure of the side expansion casing.

[0050] The reference numerals are as follows:

[0051] 100 - Main cabinet, 11 - Main cabinet body, 12 - First three-position switch, 13 - First incoming and outgoing line bushing, 14 - Circuit breaker sealed pole, 15 - First connecting conductor, 16 - Second connecting conductor, 17 - First busbar, 18 - Third connecting conductor, 19 - Second three-position switch, 20 - Fourth connecting conductor, 21 - Second incoming and outgoing line bushing;

[0052] 200-side cabinet, 22-side cabinet body, 23-second busbar, 24-third three-position switch, 25-fifth connecting conductor, 26-sixth connecting conductor, 27-third inlet and outlet bushing;

[0053] 300-connector, 28-side expansion sleeve, 281-metal conductive head, 282-insulating sleeve, 283-first blind hole, 284-second blind hole, 29-insulating part, 30-conductive tube, 301-conductive contact, 31-sealing ring, 32-O-type metal ring, 33-locating pin. DETAILED DESCRIPTION

[0054] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0055] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0056] Furthermore, in the description of the present invention, it should be noted that the terms "front, rear, inner, and outer" and other references to orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] Unless otherwise specified or limited, the terms "mounted, connected, and connected" in this disclosure should be understood broadly. For example, they may refer to fixed, removable, or integral connections. They may also refer to mechanical, electrical, or direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure.

[0058] Example 1 (Single Cabinet Solution)

[0059] This embodiment provides a high-voltage gas filling cabinet for offshore wind power, including a main cabinet 100;

[0060] The main cabinet 100 includes a main cabinet body 11, a first three-position switch 12, a first inlet and outlet bushing 13, a circuit breaker sealed pole 14, a first connecting conductor 15, a second connecting conductor 16, a first busbar 17, a third connecting conductor 18, a second three-position switch 19, a fourth connecting conductor 20 and a second inlet and outlet bushing 21;

[0061] The main cabinet 11 is filled with SF6 gas;

[0062] The first three-position switches 12 are in three groups and are arranged side by side on the upper part of the main cabinet 11 along the width direction of the main cabinet 11;

[0063] There are three first inlet and outlet bushings 13, which are arranged side by side on the upper side wall of the main cabinet 11 along the width direction of the main cabinet 11. At the same time, each first inlet and outlet bushing 13 is electrically connected to the conductive static contact of each group of first three-position switches 12;

[0064] The circuit breaker sealed pole 14 is located in the main cabinet 11 and below the first three-position switch 12. The circuit breaker sealed pole 14 is electrically connected to the middle position support of each group of the first three-position switch 12 through three first connecting conductors 15.

[0065] There are three groups of first busbars 17, which are arranged side by side along the depth direction of the main cabinet 11 inside the main cabinet 11 and below the circuit breaker sealed pole 14; the three groups of first busbars 17 are electrically connected to the circuit breaker sealed pole 14 through three second connecting conductors 16 respectively;

[0066] The second and third position switches 19 are arranged in three groups and arranged side by side along the width direction of the main cabinet 11 at the lower part of the main cabinet 11; each first busbar 17 is electrically connected to the conductive static contact of a group of the second and third position switches 19 via a third connecting conductor 18;

[0067] The middle station support of each group of second and third station switches 19 is electrically connected to the second inlet and outlet bushings 21 via a fourth connecting conductor 20;

[0068] There are three second inlet and outlet bushings 21 , which are arranged side by side on the lower side wall of the main cabinet 11 along the width direction of the main cabinet 11 .

[0069] When the single cabinet solution is working, the first inlet and outlet bushings 13 and the second inlet and outlet bushings 21 are interchangeable and can serve as the input and output ends of the current respectively. The following description takes the first inlet and outlet bushings as the input end:

[0070] The first incoming and outgoing line bushing 13 serves as the current input end of the external power supply equipment. When the conductive static contact of the first three-position switch 12 is connected to the middle position support, the current is transmitted to the circuit breaker sealed pole 14 through the first three-position switch 12 and the first connecting conductor 15. Then, the circuit breaker sealed pole 14 conducts the current into the three first busbars 17 through the three second connecting conductors 16. The three first busbars 17 conduct the current into the second three-position switch 19 through the three third connecting conductors 18. When the conductive static contact of the second three-position switch 19 is connected to the middle position support, the second three-position switch 19 transmits the current to the external equipment through the three fourth connecting conductors 20 and the three second incoming and outgoing line bushings 21.

[0071] Since in this embodiment, the insulating pillars of the first three-position switch 12 and the second three-position switch 19 are both provided with a climbing structure, the inflatable cabinet can meet the use requirements of 66kV on the basis of a compact structure.

[0072] Example 2 (Multi-cabinet solution)

[0073] This embodiment provides a high-voltage gas-filled cabinet for offshore wind power, comprising a main cabinet 100 and at least one side cabinet 200 installed side by side on the left or right side of the main cabinet 100 along the width direction of the main cabinet 100. This embodiment only provides a solution for connecting one side cabinet 200 in parallel. Depending on actual usage, a side cabinet 200 can be connected in parallel on each side of the main cabinet 100, and further parallel side cabinets 200 can be added to the sides of the side cabinet 200 as needed.

[0074] The structure of the main cabinet in this embodiment is the same as that in embodiment 1, and will not be described in detail here. The following describes the side cabinet structure and the connection structure between the main cabinet and the side cabinet in detail based on the case of connecting a side cabinet in parallel:

[0075] The side cabinet 200 includes a side cabinet body 22, a second busbar 23, a third three-position switch 24, a fifth connecting conductor 25, a sixth connecting conductor 26 and a third inlet and outlet bushing 27;

[0076] The side cabinet 22 is filled with SF6 gas;

[0077] The second busbars 23 have the same structure and number as the first busbars 17, and are at the same height as the first busbars 17. The three groups of first busbars 17 correspond to the three groups of second busbars 23. The corresponding first busbars 17 and second busbars 23 are electrically connected via connectors 300, thereby achieving electrical connection between the main cabinet 100 and the side cabinet 200.

[0078] There are three groups of third-three-position switches 24, and they are arranged side by side at the bottom inside the side cabinet 22 along the width direction of the side cabinet 22; each second busbar 23 is electrically connected to each group of third-three-position switches 24 through a fifth connecting conductor 25; each group of third-three-position switches 24 is electrically connected to a third incoming and outgoing line bushing 27 through a sixth connecting conductor 26; there are three third incoming and outgoing line bushings 27, and they are arranged side by side on the side wall below the side cabinet 22 along the width direction of the side cabinet 22.

[0079] In this embodiment, the insulating support of the third three-position switch 24 in the side cabinet 22 is also provided with a climbing structure in order to meet the use requirements of 66kV.

[0080] When the multi-cabinet solution is operating, the first inlet and outlet bushings 13 on the main cabinet 100 serve as the current input terminals for external power supply equipment. When the conductive static contact of the first three-position switch 12 is connected to the middle position support, the current is transmitted to the circuit breaker's sealed pole 14 through the first three-position switch 12 and the first connecting conductor 15. The circuit breaker's sealed pole 14 then conducts the current to three first busbars 17 via three second connecting conductors 16. The first busbar 17 conducts a portion of the current to the second three-position switch 19 via three third connecting conductors 18. When the conductive static contact of the second three-position switch 19 is connected to the middle position support, the second three-position switch 19 transmits the current to an external device via the fourth connecting conductor 20 and the second inlet and outlet bushings 21.

[0081] At the same time, the first busbar 17 diverts another part of the current to the second busbar 23 of the side cabinet through the connector 300. The second busbar 23 transmits the current to the third three-position switch 24 through the fifth connecting conductor 25. When the conductive static contact of the third three-position switch 24 is connected to the middle position support, the third three-position switch 24 transmits the current to another external device through the sixth connecting conductor 26 and the third inlet and outlet bushing 27.

[0082] There are many existing electrical connector solutions, but in order to meet the requirements of the present invention, the specific structure of the connector of this embodiment is as follows:

[0083] The connector 300 includes a side expansion sleeve 28, an insulating member 29 and a conductive tube 30;

[0084] There are two side expansion sleeves 28, which are respectively installed on the side wall of the main cabinet 11 and the side wall of the side cabinet 22;

[0085] Each side expansion sleeve 28 includes a metal conductive head 281 and an insulating sleeve 282. The metal conductive head 281 is embedded in the insulating sleeve. One end of the metal conductive head 281 extends outside the insulating sleeve for connection to the first busbar 17 or the second busbar 23, and the other end is located within the insulating sleeve 282 and is provided with a first blind hole 283. A second blind hole 284 is formed in the insulating sleeve 282. The second blind hole 284 and the first blind hole 283 are coaxial and have a larger diameter than the first blind hole 283. The insulating sleeve 282 is provided with a creepage enhancement structure at one end near the metal conductive head 281.

[0086] The two ends of the conductive tube 30 are respectively inserted into the first blind holes 283 of the two side expansion sleeves 28; an insulating part 29 is installed between the conductive tube 30 and the second blind hole 284 of the insulating sleeve 282. The insulating part 29 is made by epoxy resin casting or rubber vulcanization process. In this embodiment, the insulating part is made by rubber vulcanization process.

[0087] In order to achieve a better conductive effect, conductive contacts 301 are provided at both ends of the conductive tube 30 in this embodiment. The conductive tube 30 is electrically connected to the metal conductive heads 281 in the main cabinet 11 and the side cabinet 22 through the conductive contacts 301, thereby realizing the conduction of the first busbar 17 and the second busbar 23.

[0088] In this embodiment, the second blind hole 284 is a tapered hole, and the insulating member 29 is generally truncated cone-shaped, resulting in a conical fit between the insulating member 29 and the insulating sleeve 282. This conical fit not only facilitates assembly and provides excellent sealing, but also prevents the formation of a discharge channel between the insulating member and the side expansion sleeve, significantly improving pressure resistance.

[0089] In order to meet the requirements of offshore wind power for inflatable cabinets to be moisture-proof, corrosion-proof, mildew-proof, and salt spray-proof, the connector of this embodiment is designed with a sealing and grounding structure, which includes a sealing ring 31 and an O-ring 32; the insulating sleeve 282 has a sealing ring groove on the end face away from the metal conductive head 281, and the sealing ring 31 is installed in the sealing ring groove; the insulating part 29 is installed with an O-ring 32 on the outer surface of the middle area (that is, corresponding to the position between the two side expansion sleeves), and the O-ring 32 is grounded through a wire to ensure reliable insulation of the connector.

[0090] In order to achieve reliable assembly of the main cabinet 100 and the side cabinet 200, the connector 300 also includes a positioning pin 33. The insulating sleeve 282 has multiple positioning pin holes evenly arranged along the circumference on the end face of one end away from the metal conductive head 281, and positioning pins 33 are provided between the multiple positioning pin holes on the two side expansion sleeves 28.

[0091] The above disclosure is only a specific embodiment of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A high-pressure inflatable cabinet for offshore wind power, characterized by: Including main cabinet; The main cabinet includes a main cabinet body, a first three-position switch, a first inlet and outlet bushing, a circuit breaker sealed pole, a first connecting conductor, a second connecting conductor, a first busbar, a third connecting conductor, a second three-position switch, a fourth connecting conductor and a second inlet and outlet bushing; The main cabinet is filled with SF6 gas; The first three-position switches are in three groups and are arranged side by side on the upper part of the main cabinet along the width direction of the main cabinet; There are three first inlet and outlet bushings, which are arranged side by side on the upper side wall of the main cabinet along the width direction of the main cabinet, and each first inlet and outlet bushing is electrically connected to the conductive static contact of each group of the first three-position switches; The circuit breaker sealed pole is located in the main cabinet and below the first three-position switch. The circuit breaker sealed pole is electrically connected to the middle position support of each group of the first three-position switch through three first connecting conductors. There are three groups of first busbars, which are arranged side by side inside the main cabinet along the depth direction of the main cabinet and below the sealed poles of the circuit breaker; each first busbar is electrically connected to the sealed pole of the circuit breaker via a second connecting conductor; The second and third position switches are arranged in three groups and arranged side by side in the lower part of the main cabinet along the width direction of the main cabinet; each first busbar is electrically connected to the conductive static contact of each group of the second and third position switches through a third connecting conductor; The middle station support of each group of second three-station switches is electrically connected to a second inlet and outlet bushing via a fourth connecting conductor; There are three second inlet and outlet bushings, which are arranged side by side on the lower side wall of the main cabinet along the width direction of the main cabinet.

2. A high-voltage inflatable cabinet for offshore wind power according to claim 1, characterized in that: It also includes at least one side cabinet installed side by side on the left or right side of the main cabinet along the width direction of the main cabinet; The side cabinet includes a side cabinet body, a second busbar, a third three-position switch, a fifth connecting conductor, a sixth connecting conductor and a third inlet and outlet bushing; The side cabinet is filled with SF6 gas; The second busbars have the same structure and number as the first busbars, and are at the same height as the first busbars. The three groups of first busbars correspond to the three groups of second busbars one by one. The corresponding first busbars and second busbars are electrically connected through connectors, thereby realizing the electrical connection between the main cabinet and the side cabinet. The third three-position switches are arranged in three groups and arranged side by side at the lower part of the side cabinet along the width direction of the side cabinet; each second busbar is electrically connected to each group of the third three-position switches via a fifth connecting conductor; Each group of third three-position switches is electrically connected to a third inlet and outlet bushing via a sixth connecting conductor; There are three third inlet and outlet bushings, which are arranged side by side on the lower side wall of the side cabinet along the width direction of the side cabinet.

3. A high-voltage inflatable cabinet for offshore wind power according to claim 2, characterized in that: The connector includes a side expansion sleeve, an insulating member and a conductive tube; There are two side expansion sleeves, which are installed on the side wall of the main cabinet and the side cabinet respectively; Each side expansion sleeve includes a metal conductive head and an insulating sleeve; the metal conductive head is embedded in the insulating sleeve; one end of the metal conductive head extends outside the insulating sleeve for connecting to the first busbar or the second busbar, and the other end is located inside the insulating sleeve and is provided with a first blind hole; a second blind hole is provided in the insulating sleeve, and the second blind hole and the first blind hole are coaxial, and the aperture of the second blind hole is larger than that of the first blind hole; The two ends of the conductive tube are respectively inserted into the first blind holes of the two side expansion sleeves; an insulating piece is installed between the conductive tube and the second blind hole of the insulating sleeve.

4. A high-voltage inflatable cabinet for offshore wind power according to claim 3, characterized in that: The two ends of the conductive tube are electrically connected to the metal conductive head through conductive contact fingers.

5. A high-voltage inflatable cabinet for offshore wind power according to claim 4, characterized in that: The second blind hole is a tapered hole, and the insulating member is in a frustum shape as a whole, so that the insulating member and the insulating sleeve form a conical surface fit.

6. A high-voltage inflatable cabinet for offshore wind power according to claim 5, characterized in that: The connector further includes a sealing and grounding structure, which includes a sealing ring and an O-shaped metal ring; the insulating sleeve is provided with a sealing ring groove on an end surface away from the metal conductive head, and the sealing ring is installed in the sealing ring groove; An O-shaped metal ring is installed on the outer surface of the middle area of ​​the insulating member, and the O-shaped metal ring is grounded through a wire.

7. A high-voltage inflatable cabinet for offshore wind power according to claim 6, characterized in that: The connector also includes a positioning pin. The insulating sleeve has a plurality of positioning pin holes evenly arranged along the circumference on the end surface away from the metal conductive head. Positioning pins are provided between the plurality of positioning pin holes on the two side expansion sleeves.

8. A high-voltage inflatable cabinet for offshore wind power according to claim 7, characterized in that: The insulating sleeve is provided with a creepage-increasing structure at one end close to the metal conductive head.

9. A high-voltage inflatable cabinet for offshore wind power according to claim 8, characterized in that: The insulating pillars of the first three-position switch, the second three-position switch and the third three-position switch are all provided with climbing structures.

10. A high-voltage inflatable cabinet for offshore wind power according to claim 9, characterized in that: The insulating member is made by epoxy resin casting or rubber vulcanization process.

Images