An insulation structure based on offshore wind power of 72.5kV voltage level

Abstract

The application discloses a kind of based on offshore wind power's 72.5kV voltage grade insulation structure, including cabinet, first insulation connecting end group, second insulation connecting end group, first switch module and second switch module, air cavity is equipped in cabinet, first insulation connecting end group is arranged in cabinet, second insulation connecting end group is arranged in cabinet, one end of first switch module is connected with first insulation connecting end group, first insulation connecting end group makes first switch module and cabinet insulation, the other end of second switch module is connected with second insulation connecting end group, second insulation connecting end group makes second switch module and cabinet insulation, the other end of first switch module is electrically connected with the other end of second switch module, wherein, first switch module and second switch module are located air cavity and first switch module and second switch module are respectively located two sides of air cavity, the volume of the design can greatly reduce insulation structure, compact structure, meet electrical insulation isolation demand.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and in particular to an insulation structure based on a 72.5kV voltage level for offshore wind power. Background Technology

[0002] Gas-insulated switchgear is widely used in the electrical field. Switchgear is generally equipped with switch modules such as disconnect switches and circuit breakers. In the past, for power transmission of conventional complete sets of equipment (such as below 52kV), each switch module had an independent chamber, and adjacent chambers were separated by partitions. The switch modules in adjacent chambers were connected to each other, and connection terminal groups were set on the partitions. Multiple switch modules were electrically connected and insulated and supported for fixation through the connection terminal groups.

[0003] As the national development focus shifts towards onshore wind turbines of 8MW and above and offshore wind turbines of 13MW and above, there is a need to develop deep-sea floating offshore wind power equipment. The corresponding 72.5kV offshore wind power switchgear has seen large-scale development. However, due to the increase in voltage level, the electrical insulation distance between the switch module and the insulating partition also increases, which means that each chamber needs to be enlarged accordingly, resulting in an increase in the overall volume of the gas-insulated switchgear. However, when applied to offshore facilities, in order to save on engineering construction costs, the switchgear is required to be installed in a small tower, and its installation space is greatly limited. Existing voltage level products do not meet the needs of the increased wind turbine capacity, while high-voltage level GIS structures do not meet the needs of the offshore wind power operating environment. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an insulation structure based on a 72.5kV voltage level for offshore wind power, which is compact, meets electrical insulation isolation requirements, and reduces volume.

[0005] An insulation structure for a 72.5kV voltage level offshore wind power according to a first aspect of the present invention includes: a cabinet having an internal inflation chamber filled with insulating gas; a first insulating connection terminal group disposed in the cabinet and at least partially located in the inflation chamber; a second insulating connection terminal group disposed in the cabinet and at least partially located in the inflation chamber; a first switch module and a second switch module, one end of the first switch module being connected to the first insulating connection terminal group, the first insulating connection terminal group insulating the first switch module from the cabinet, one end of the first switch module being electrically connected to an external first device through the first insulating connection terminal group, the other end of the second switch module being connected to the second insulating connection terminal group, the second insulating connection terminal group insulating the second switch module from the cabinet, one end of the second switch module being electrically connected to an external second device through the second insulating connection terminal group, and the other end of the first switch module being electrically connected to the other end of the second switch module; wherein the first switch module and the second switch module are both located in the inflation chamber and are each located on opposite sides of the inflation chamber.

[0006] An insulation structure for 72.5kV offshore wind power according to an embodiment of the present invention has at least the following beneficial effects:

[0007] The insulation structure of this invention uses only one air-filled cavity. A first insulating connection end group is set inside the cabinet to support the first switch module, and an external first device can also be connected to the first switch module through the first insulating connection end group. Similarly, a second insulating connection end group is set inside the cabinet to support the second switch module, and an external second device can also be connected to the second switch module through the second insulating connection end group. The first switch module and the second switch module are located on opposite sides of the air-filled cavity, without interfering with each other. Furthermore, the first switch module and the second switch module only need to consider the electrical insulation distance between them and the electrical insulation distance between them and the inner wall of the cabinet, which can greatly reduce the volume of the insulation structure, making the structure compact and meeting the electrical insulation isolation requirements.

[0008] According to some embodiments of the present invention, the first switch module includes a vacuum circuit breaker assembly, and the second switch module includes an isolating switch assembly.

[0009] According to some embodiments of the present invention, the insulation structure further includes a control mechanism disposed in the cabinet. The vacuum circuit breaker assembly includes a pole housing, an arc-extinguishing housing, an arc-extinguishing moving contact, an arc-extinguishing stationary contact, and a movable rod. The pole housing is disposed in the first insulating connection terminal group. The arc-extinguishing moving contact is electrically connected to the first insulating connection terminal group. The pole housing is sleeved on the arc-extinguishing housing. An arc-extinguishing chamber is disposed inside the arc-extinguishing housing. The arc-extinguishing stationary contact is electrically connected to the other end of the disconnecting switch assembly. The arc-extinguishing stationary contact is partially located in the arc-extinguishing chamber. The arc-extinguishing moving contact is disposed at one end of the movable rod, and the arc-extinguishing moving contact is partially located in the arc-extinguishing chamber. The control mechanism is connected to the movable rod and can drive the movable rod to move so that the arc-extinguishing moving contact and the arc-extinguishing stationary contact approach each other or move away from each other. A first insulating adhesive is filled between the pole housing and the arc-extinguishing housing.

[0010] According to some embodiments of the present invention, the first switch module includes a first disconnect switch assembly, and the second switch module includes a second disconnect switch assembly.

[0011] According to some embodiments of the present invention, the insulating structure further includes a conductive connecting plate and a control mechanism. The conductive connecting plate is insulatedly disposed in the cabinet, and the control mechanism is disposed in the cabinet. The first disconnecting switch assembly includes a first sleeve, a first moving contact, a first stationary contact, and a first lead screw. The second disconnecting switch assembly includes a second sleeve, a second moving contact, a second stationary contact, and a second lead screw. The first insulating connecting end group and the second insulating connecting end group are respectively located on opposite sides of the inflation cavity. The first stationary contact is disposed at one end of the conductive connecting plate, and the second stationary contact is disposed at the other end of the conductive connecting plate so that the first stationary contact and the second stationary contact are conductively connected. The first sleeve and the second sleeve are both disposed on the cabinet. The first stationary contact is located inside the first sleeve. The first lead screw rotatably passes through the first sleeve, and there is an insulating gap between the outer side wall of the first lead screw and the inner side wall of the first sleeve. The first sleeve is provided with a first opening. The first insulated connection end group partially passes through the first opening to make conductive contact with the outer side wall of the first lead screw. The second stationary contact is located inside the second sleeve. The second lead screw rotatably passes through the second sleeve, and there is an insulating gap between the outer side wall of the second lead screw and the inner side wall of the second sleeve. The second sleeve is provided with a second opening. The second insulated connection end group partially passes through the second opening to make conductive contact with the outer side wall of the second lead screw. The first moving contact is provided at one end of the first lead screw, and the second moving contact is provided at the other end of the second lead screw. The control mechanism is insulatedly connected to the first lead screw and the second lead screw respectively. The control mechanism can drive the first lead screw to rotate so that the first moving contact approaches and abuts with the first stationary contact or moves away from it and disconnects. The control mechanism can drive the second lead screw to rotate so that the second moving contact approaches and abuts with the second stationary contact or moves away from it and disconnects. The first opening and the second opening are opposite to each other.

[0012] According to some embodiments of the present invention, the insulating structure further includes a supporting shell, the cabinet is disposed inside the supporting shell, an insulating support rod is disposed inside the supporting shell, the insulating support rod is connected to the outer wall of the cabinet, and there is an insulating gap between any position of the outer wall of the cabinet and the inner wall of the supporting shell, and the operating mechanism is disposed between the inner wall of the supporting shell and the outer wall of the cabinet.

[0013] According to some embodiments of the present invention, the insulation structure further includes a third insulating connection terminal group and a connecting busbar. The third insulating connection terminal group is disposed in the cabinet and at least partially located in the inflation cavity. The conductive connecting plate is connected to the third insulating connection terminal group, and the third insulating connection terminal group insulates the conductive connecting plate from the cabinet. The connecting busbar is located outside the cabinet and is electrically connected to the third insulating connection terminal group. The conductive connecting plate is electrically connected to the connecting busbar through the third insulating connection terminal group.

[0014] According to some embodiments of the present invention, the first insulating connection terminal group includes an insulating support and a conductor. The insulating support is disposed in the cabinet and is connected to the first switch module. The conductor passes through the cabinet, one end of the conductor is electrically connected to the first switch module, and the other end of the conductor is used for electrical connection to a first device. A second insulating adhesive is filled between the outer peripheral wall of the conductor and the cabinet.

[0015] According to some embodiments of the present invention, the insulating support is tubular, and a receiving cavity is provided inside the insulating support. The conductor passes through the insulating support and is located in the receiving cavity, and the second insulating colloid also fills the receiving cavity.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a three-dimensional schematic diagram of one embodiment of the insulation structure of the present invention;

[0019] Figure 2 This is a front view of the internal structure of one embodiment of the insulation structure of the present invention;

[0020] Figure 3 This is a front view of the internal structure of another embodiment of the insulation structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the cross-section of the first insulating connection terminal group.

[0022] Figure label:

[0023] Support shell 100; insulating support rod 110; cabinet 200; air filling chamber 210; first insulating connection end group 300; insulating bracket 310; conductor 320; second insulating colloid 330; second insulating connection end group 400; third insulating connection end group 500; first switch module 600; first sleeve 610; first opening 620; second switch module 700; second sleeve 710; second opening 720; control mechanism 800; conductive connection plate 900. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, it should be understood that the orientation descriptions, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer", indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0026] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] like Figure 1-4As shown, according to a first aspect embodiment of the present invention, an insulation structure for a 72.5kV voltage level offshore wind power includes a cabinet 200, a first insulating connection terminal group 300, a second insulating connection terminal group 400, a first switch module 600, and a second switch module 700. The cabinet 200 has an inflation chamber 210 filled with insulating gas. The first insulating connection terminal group 300 is disposed in the cabinet 200 and at least partially located within the inflation chamber 210. The second insulating connection terminal group 400 is disposed in the cabinet 200 and at least partially located within the inflation chamber 210. One end of the first switch module 600 is connected to the first insulating connection terminal group 300, and the first insulating connection terminal group 300 enables the first switch module 600 to... The first switch module 600 is insulated from the cabinet 200. One end of the first switch module 600 is electrically connected to the first external device through the first insulating connection terminal group 300. The other end of the second switch module 700 is connected to the second insulating connection terminal group 400. The second insulating connection terminal group 400 insulates the second switch module 700 from the cabinet 200. One end of the second switch module 700 is electrically connected to the second external device through the second insulating connection terminal group 400. The other end of the first switch module 600 is electrically connected to the other end of the second switch module 700. The first switch module 600 and the second switch module 700 are both located in the inflation chamber 210 and are located on opposite sides of the inflation chamber 210.

[0029] The cabinet 200 can be assembled from 3mm thick stainless steel plates and can be rectangular. The insulating gas filled in the inflation chamber 210 can be SF6 gas. Before filling, a highly hygroscopic desiccant can be placed in the inflation chamber 210 to dry it. Then, during the power frequency withstand voltage test, the residual metal powder particles are burned off during the voltage increase. During the filling of SF6 gas, SF6 gas is repeatedly added to the inflation chamber 210 to increase the concentration of SF6 gas in the inflation chamber 210 and improve the insulation effect.

[0030] In addition, this design uses a lower SF6 gas filling pressure of 0.135MPa, which is more environmentally friendly than existing products. Due to the smaller internal and external pressure difference, the probability of gas leakage during operation is lower. Once a gas leak occurs, the insulation level drops very little at zero gauge pressure, allowing the equipment to operate normally for a longer period of time after a leak occurs, which can greatly reduce the losses caused by failure or downtime.

[0031] It should be noted that both the first and second devices can be transformer groups, generators, electrical loads, etc. in the electrical field, and the insulation structure can be set between the first and second devices to realize power transmission and on / off control.

[0032] The insulation structure of this invention uses only one inflation chamber 210. A first insulating connection end group 300 is set inside the cabinet 200 to support the first switch module 600, and an external first device can also be connected to the first switch module 600 through the first insulating connection end group 300. Similarly, a second insulating connection end group 400 is set inside the cabinet 200 to support the second switch module 700, and an external second device can also be connected to the second switch module 700 through the second insulating connection end group 400. The first switch module 600 and the second switch module 700 are located on both sides of the inflation chamber 210, without interfering with each other. Furthermore, the first switch module 600 and the second switch module 700 only need to consider the electrical insulation distance between them and the electrical insulation distance between them and the inner wall of the cabinet 200, which can greatly reduce the volume of the insulation structure, making the structure compact and meeting the electrical insulation isolation requirements.

[0033] In some embodiments of the present invention, the first switch module 600 includes a vacuum circuit breaker assembly and the second switch module 700 includes a disconnecting switch assembly. Placing the vacuum circuit breaker assembly and the disconnecting switch assembly in the same gas-filled cavity 210 results in a more compact structure and reduces the volume of the insulation structure.

[0034] In some embodiments of the present invention, such as Figure 3 As shown, the insulation structure also includes a control mechanism 800, which is disposed in the cabinet 200. The vacuum circuit breaker assembly includes a pole housing, an arc-extinguishing housing, an arc-extinguishing moving contact, an arc-extinguishing stationary contact, and a movable rod. The pole housing is disposed in the first insulating connection terminal group 300. The arc-extinguishing moving contact is electrically connected to the first insulating connection terminal group 300. The pole housing is sleeved on the arc-extinguishing housing. An arc-extinguishing chamber is disposed inside the arc-extinguishing housing. The arc-extinguishing stationary contact is electrically connected to the other end of the disconnecting switch assembly. The arc-extinguishing stationary contact is partially located in the arc-extinguishing chamber. The arc-extinguishing moving contact is disposed at one end of the movable rod and is partially located in the arc-extinguishing chamber. The control mechanism 800 is connected to the movable rod. The control mechanism 800 can drive the movable rod to move so that the arc-extinguishing moving contact and the arc-extinguishing stationary contact approach each other or move away from each other and disconnect. A first insulating adhesive is filled between the pole housing and the arc-extinguishing housing.

[0035] The control mechanism 800 includes a control handle and a transmission mechanism. For example, the transmission mechanism may consist of components such as a lead screw, transmission gears, and chains. When the control handle is rotated, the movable rod can be rotated through the transmission mechanism. The movable rod may be a lead screw. The transmission mechanism can drive the movable rod to translate through the lead screw, thereby causing the arc-extinguishing moving contact to move closer to or away from the arc-extinguishing stationary contact during the rotation.

[0036] The pole housing and the arc-extinguishing housing adopt a non-sealed structure, that is, the pole housing and the arc-extinguishing housing are not integrally formed, which improves the heat dissipation performance. At the same time, a first insulating colloid is filled between the pole housing and the arc-extinguishing housing. The first insulating colloid can be a rubber or resin with high insulation performance, which improves the insulation performance between the pole housing and the arc-extinguishing housing. Meanwhile, the gas in the inflation chamber 210 may also provide sufficient insulation performance for the gap between the pole housing and the arc-extinguishing housing, making it possible to reduce the volume of the inflation chamber 210.

[0037] In some embodiments of the present invention, such as Figure 1 , 2 As shown, the first switch module 600 includes a first disconnecting switch assembly, and the second switch module 700 includes a second disconnecting switch assembly. Multiple disconnecting switch assemblies can also be placed together in the same inflation chamber 210, such as... Figure 1 , 2 The first and second disconnector components in the structure make the structure more compact and reduce the volume of the insulation structure.

[0038] In some embodiments of the present invention, the insulating structure further includes a conductive connecting plate 900 and a control mechanism 800. The conductive connecting plate 900 is insulatingly disposed in the cabinet 200, and the control mechanism is disposed in the cabinet 200. The first disconnecting switch assembly includes a first sleeve 610, a first moving contact, a first stationary contact, and a first lead screw. The second disconnecting switch assembly includes a second sleeve 710, a second moving contact, a second stationary contact, and a second lead screw. The first insulating connecting end group 300 and the second insulating connecting end group 400 are respectively located on opposite sides of the inflation chamber 210. The first stationary contact is disposed at one end of the conductive connecting plate 900, and the second stationary contact is disposed at the other end of the conductive connecting plate 900 so that the first stationary contact and the second stationary contact are electrically connected. The first sleeve 610 and the second sleeve 710 are both disposed on the cabinet 200. The first stationary contact is located inside the first sleeve 610. The first lead screw rotatably passes through the first sleeve 610, and there is an insulating gap between the outer side wall of the first lead screw and the inner side wall of the first sleeve 610. The first sleeve 710 has a first opening 620, through which a first insulating connection end group 300 partially passes to make conductive contact with the outer side wall of the first lead screw. The second stationary contact is located inside the second sleeve 710. The second lead screw is rotatably inserted into the second sleeve 710, and there is an insulating gap between the outer side wall of the second lead screw and the inner side wall of the second sleeve 710. The second sleeve 710 has a second opening 720, through which a second insulating connection end group 400 partially passes to make conductive contact with the outer side wall of the second lead screw. The first moving contact is located at one end of the first lead screw, and the second moving contact is located at the other end of the second lead screw. The control mechanism 800 is insulatedly connected to the first lead screw and the second lead screw respectively. The control mechanism 800 can drive the first lead screw to rotate so that the first moving contact approaches and abuts with the first stationary contact or moves away from it and disconnects. The control mechanism 800 can also drive the second lead screw to rotate so that the second moving contact approaches and abuts with the second stationary contact or moves away from it and disconnects it. The first opening 620 and the second opening 720 are opposite to each other.

[0039] Similarly, the control mechanism 800 may also include a control handle and a transmission mechanism. For example, the transmission mechanism may consist of components such as a lead screw, transmission gears, and chains. When the control handle is rotated, the first lead screw or the second lead screw can be rotated through the transmission mechanism via the lead screw. It should be noted that the first insulating connection end group 300 is electrically bonded to the outer wall of the first lead screw, and the second insulating connection end group 400 is electrically bonded to the outer wall of the second lead screw. The first and second lead screws themselves can transmit electrical energy. During the rotation of the first lead screw, the first moving contact is driven to approach or move away from the first stationary contact, while the second lead screw can drive the second moving contact to approach or move away from the second stationary contact during the rotation.

[0040] Specifically, such as Figure 2As shown, the control handle can be located on the side of the cabinet 200. A first gear is provided at the end of the control handle. A transmission screw is also provided on the side of the cabinet 200 and rotates vertically. A second gear is provided at the upper end of the transmission screw. The first gear and the second gear mesh. Rotating the control handle can drive the second gear through the first gear, thereby driving the transmission screw to rotate. A third gear is provided at the bottom end of the transmission screw. A chain is wound around the third gear. A rotating seat is provided at the bottom of the cabinet 200. The rotating seat is insulated from the nut that drives the first screw to rotate but is coaxial. A fourth gear is provided on the rotating seat. The chain is also wound around the fourth gear. Rotating the transmission screw drives the third gear to rotate, thereby dragging the chain. The chain then drives the fourth gear to rotate. The rotating seat rotates accordingly, driving the nut to rotate. During the rotation of the first screw, the first moving contact moves closer to or away from the first stationary contact.

[0041] The above describes how the control mechanism 800 drives the first lead screw to move. Specifically, there can be two sets of control mechanisms 800. One set of control mechanisms 800 is located on one side of the cabinet 200, while the other set of control mechanisms 800 is located on the other side of the cabinet 200. The other set of control mechanisms 800 is used to drive the second lead screw to move.

[0042] The two sets of control mechanisms 800 work together to drive the first disconnect switch assembly and the second disconnect switch assembly. They share an air chamber 210 and are arranged symmetrically. They also achieve multiple 90° turns through a transmission mechanism, so that the operating handle is located on the side and facing the operator, making it easy to operate. The control mechanism 800 can be set close to the outer surface of the cabinet 200, saving space.

[0043] Both the first sleeve 610 and the second sleeve 710 can be made of ceramic, plastic or resin with high insulation performance. The first opening 620 and the second opening 720 are back to back. In the limited space of the air chamber 210, the surface distance between the first sleeve 610 and the second sleeve 710 can be used to form a longer electrical insulation distance. Under the action of insulating gas, it can provide better insulation performance.

[0044] In addition, this design optimizes the electrode shapes of the arc-extinguishing moving contact, the arc-extinguishing stationary contact, the first moving contact, and the first stationary contact, forming rounded corner structures with larger curvatures at the arc-extinguishing moving contact, the arc-extinguishing stationary contact, the first moving contact, and the first stationary contact, and electroplating them; a thin steel plate is added to the inner wall of the gas filling chamber as a shielding plate to play a role in uniformly distributing the boundary electric field.

[0045] In some embodiments of the present invention, the insulating structure further includes a supporting shell 100, a cabinet 200 disposed within the supporting shell 100, an insulating support rod 110 disposed within the supporting shell 100, the insulating support rod 110 being connected to the outer wall of the cabinet 200, and an insulating gap being present between any position of the outer wall of the cabinet 200 and the inner wall of the supporting shell 100, and a control mechanism 800 disposed between the inner wall of the supporting shell 100 and the outer wall of the cabinet 200.

[0046] The first insulating connection terminal group 300 and the second insulating connection terminal group 400 can be connected to the first device and the second device respectively via cables. The connection position of the cable to the first insulating connection terminal group 300 and the second insulating connection terminal group 400 can be located between the cabinet 200 and the supporting shell 100. The insulating support rod 110 can be made of insulating materials such as resin, has a certain degree of hardness, and can provide support for the cabinet 200. After the cable connection is completed and the control mechanism 800 is operated, the user leaves the insulating structure, and the insulating gap between the supporting shell 100 and the cabinet 200 can form a second layer of insulating protection.

[0047] In some embodiments of the present invention, such as Figure 2 As shown, the insulation structure also includes a third insulating connection terminal group 500 and a connecting busbar. The third insulating connection terminal group 500 is disposed in the cabinet 200 and is at least partially located in the inflation cavity 210. The conductive connecting plate 900 is connected to the third insulating connection terminal group 500. The third insulating connection terminal group 500 insulates the conductive connecting plate 900 from the cabinet 200. The connecting busbar is located outside the cabinet 200 and is electrically connected to the third insulating connection terminal group 500. The conductive connecting plate 900 is electrically connected to the connecting busbar through the third insulating connection terminal group 500.

[0048] The connecting busbar can be used to connect to external equipment. Users can make wiring between the cabinet 200 and the supporting shell 100. The conductive connecting plate 900 can be made of copper. Specifically, the third insulating connection terminal group 500 is located at the top of the air-filled cavity 210. The connection position between the unit cabinets that traditionally house multiple separate disconnector switch components is changed to the connection at the top of the air-filled cavity 210, which reduces the overall size of the multiple unit cabinets after splicing and saves floor space.

[0049] In some embodiments of the present invention, such as Figure 4 As shown, the first insulating connection terminal group 300 includes an insulating support 310 and a conductor 320. The insulating support 310 is disposed inside the cabinet 200 and is connected to the first switch module 600. The conductor 320 passes through the cabinet 200. One end of the conductor 320 is electrically connected to the first switch module 600, and the other end of the conductor 320 is used for electrical connection to the first device. A second insulating adhesive 330 is filled between the outer peripheral wall of the conductor 320 and the cabinet 200.

[0050] The conductor 320 passes through the cabinet 200 to achieve the connection between the first device and the first switch module 600. At the same time, the insulating bracket 310 provides insulating support for the first switch module 600 to maintain its stability. The second insulating adhesive 330 can be made of rubber or resin to prevent conductive contact between the conductor 320 and the cabinet 200 and to provide good insulation performance.

[0051] Specifically, the insulating support 310 is tubular, and a receiving cavity is provided inside the insulating support 310. The conductor 320 passes through the insulating support 310 and is located in the receiving cavity. The second insulating adhesive 330 also fills the receiving cavity. The second insulating adhesive 330 fills the receiving cavity, and the tubular insulating support 310 is used to limit the filling position of the second insulating adhesive 330 to prevent air breakdown between the conductor 320 and the cabinet 200.

[0052] Specifically, the second insulating connection terminal group 400 and the third insulating connection terminal group 500 can both adopt a structure similar to that of the first insulating connection terminal group 300.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An insulation structure for 72.5kV voltage level offshore wind power, characterized in that, include: The cabinet has an internal inflation chamber filled with insulating gas. A first insulating connection terminal group is disposed on the cabinet and is at least partially located in the inflation cavity; A second insulating connection terminal assembly is disposed on the cabinet and is at least partially located in the inflation cavity; A first switch module and a second switch module, one end of the first switch module is connected to the first insulated connection terminal group, one end of the second switch module is connected to the second insulated connection terminal group, and the other end of the first switch module is electrically connected to the other end of the second switch module; The first switch module and the second switch module are both located inside the inflation chamber, and the first switch module and the second switch module are each located on both sides of the inflation chamber. The first switch module includes a first disconnect switch assembly, and the second switch module includes a second disconnect switch assembly; It also includes a conductive connecting plate and a control mechanism. The conductive connecting plate is insulated within the cabinet, and the control mechanism is mounted on the cabinet. The first disconnecting switch assembly includes a first sleeve, a first moving contact, a first stationary contact, and a first lead screw. The second disconnecting switch assembly includes a second sleeve, a second moving contact, a second stationary contact, and a second lead screw. The first insulated connecting end group and the second insulated connecting end group are located on opposite sides of the inflation chamber. The first stationary contact is located at one end of the conductive connecting plate, and the second stationary contact is located at the other end of the conductive connecting plate so that the first stationary contact and the second stationary contact are conductively connected. Both the first sleeve and the second sleeve are mounted on the cabinet, and the first stationary contact is located inside the first sleeve. A first lead screw rotatably passes through the first sleeve, and there is an insulating gap between the outer wall of the first lead screw and the inner wall of the first sleeve. The first sleeve has a first opening, and a portion of the first insulated connection end group passes through the first opening to make conductive contact with the outer wall of the first lead screw. A second stationary contact is located inside the second sleeve. A second lead screw rotatably passes through the second sleeve, and there is an insulating gap between the outer wall of the second lead screw and the inner wall of the second sleeve. The second sleeve has a second opening, and a portion of the second insulated connection end group passes through the second opening to make conductive contact with the outer wall of the second lead screw. A first moving contact is located at one end of the first lead screw, and a second moving contact is located at the other end of the second lead screw.

2. The insulation structure for 72.5kV voltage level offshore wind power according to claim 1, characterized in that: The first insulating connection terminal group insulates the first switch module from the cabinet, and one end of the first switch module is electrically connected to an external first device through the first insulating connection terminal group. The second insulating connection terminal group insulates the second switch module from the cabinet, and one end of the second switch module is electrically connected to an external second device through the second insulating connection terminal group.

3. An insulation structure for 72.5kV voltage level offshore wind power according to claim 2, characterized in that: The control mechanism is insulated from the first lead screw and the second lead screw respectively. The control mechanism can drive the first lead screw to rotate so that the first moving contact approaches and abuts with the first stationary contact or moves away from it and disconnects. The control mechanism can drive the second lead screw to rotate so that the second moving contact approaches and abuts with the second stationary contact or moves away from it and disconnects. The first opening and the second opening are opposite to each other.

4. An insulation structure for 72.5kV voltage level offshore wind power according to claim 3, characterized in that: It also includes a supporting shell, the cabinet is disposed inside the supporting shell, an insulating support rod is disposed inside the supporting shell, the insulating support rod is connected to the outer wall of the cabinet, and there is an insulating gap between any position of the outer wall of the cabinet and the inner wall of the supporting shell, and the control mechanism is disposed between the inner wall of the supporting shell and the outer wall of the cabinet.

5. An insulation structure for 72.5kV voltage level offshore wind power according to claim 3, characterized in that: It also includes a third insulated connection terminal group and a connecting busbar. The third insulated connection terminal group is disposed on the cabinet and is at least partially located in the inflation cavity. The conductive connecting plate is connected to the third insulated connection terminal group, and the third insulated connection terminal group insulates the conductive connecting plate from the cabinet. The connecting busbar is located outside the cabinet and is electrically connected to the third insulated connection terminal group. The conductive connecting plate is electrically connected to the connecting busbar through the third insulated connection terminal group.

6. An insulation structure for 72.5kV voltage level offshore wind power according to claim 1, characterized in that: The first insulating connection terminal group includes an insulating support and a conductor. The insulating support is disposed inside the cabinet and is connected to the first switch module. The conductor passes through the cabinet, one end of which is electrically connected to the first switch module, and the other end of which is used for electrical connection to the first device. A second insulating adhesive is filled between the outer peripheral wall of the conductor and the cabinet.

7. An insulation structure for 72.5kV voltage level offshore wind power according to claim 6, characterized in that: The insulating support is tubular, and a receiving cavity is provided inside the insulating support. The conductor passes through the insulating support and is located in the receiving cavity. The second insulating colloid also fills the receiving cavity.

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