A kind of ultra-high voltage air-core reactor

Abstract

A ultra-high voltage air-core reactor, which comprises: a coil, a grading ring and a support insulator; the coil includes an upper coil, a lower coil, an insulating layer and at least two connection terminals, wherein the nut at the lowermost end of the upper coil and the nut at the uppermost end of the lower coil need to be connected by a connecting rod to connect the upper and lower coils in series; the coil adopts an inner shielded winding structure, and at least two connection terminals are connected to the outer side of the winding outer circle and extend through the insulating layer to the outside of the winding, and are fixed on the support plate for convenient external wiring; the coil clamping device includes upper and lower star-shaped frames respectively installed at the upper and lower ends of the coil and a connecting member, and the upper and lower star-shaped frames are connected by the connecting member to clamp the coil up and down, and the rigid connecting member supports the coil around the inner wall of the coil so that the whole forms a stable structure; the reactor structure proposed by the present invention is compact and novel, small in volume, light in weight, good in heat dissipation effect, high in withstand voltage, capable of multi-capacity service, small in installation space required, and strong in practicability.

Description

Technical Field

[0001] This application belongs to the technical field of air-core reactors, and particularly relates to an extra-high voltage air-core reactor. Background Art

[0002] Air-core reactors generally adopt a multi-packet, multi-layer, multi-branch parallel structure with small cross-section round aluminum wires. The wire is made of conventional voltage-resistant insulating materials. The winding packet is reinforced by winding with epoxy resin fiberglass materials. The end is clamped by a high-strength aluminum alloy star-shaped frame, and tightened by an epoxy fiberglass pull tape to make the reactor winding a rigid whole. However, for extra-high voltage, large inductance, and multi-tap air-core reactors, it is required that the wire diameter of the reactor is single and the number of turns is very large, the voltage withstand requirement is high, the creepage distance requirement is high, and there are many tap outgoing lines. According to the conventional air-core reactor structure, the volume will be too wide and too high, and the multi-tap outgoing line structure is too complex to be realized. Summary of the Invention

[0003] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide an extra-high voltage air-core reactor.

[0004] The present invention adopts the following technical solutions. An extra-high voltage air-core reactor, which includes: a coil, a grading ring, and a support insulator. The coil includes an upper coil, a lower coil, an insulating layer, and at least two connection terminals. The upper coil and the lower coil are connected in series by a connecting rod. The upper coil and the lower coil are tightly clamped and connected by a coil clamping device. The coil adopts an inner shielded winding structure. The coil includes several pancake coils. End insulation is provided at both ends of the coil. Inter-turn insulation is provided between each pancake coil. The insulating layer wraps the coil. At least two connection terminals are connected to the outer side of the coil and extend from the outer circle of the coil through the insulating layer to the outside of the coil and are fixed on a support plate. The coil clamping device includes an upper star-shaped frame, a lower star-shaped frame, and a connecting member. Grooves with a set depth and width are respectively opened at the upper end and the lower end of the coil according to the number of arms and the thickness of the arms of the star-shaped frame. The upper star-shaped frame is installed at the upper end of the coil and is embedded in the groove. The lower star-shaped frame is installed at the lower end of the coil and is embedded in the groove. The upper star-shaped frame is connected to the lower star-shaped frame through the connecting member and clamps the coil up and down. The rigid second connecting member of the clamping device supports the coil around the inner wall of the coil to make the whole form a stable structure. The grading ring includes an upper grading ring and a lower grading ring, which are respectively installed on the upper star-shaped frame and the lower star-shaped frame. The support insulator is installed at the lower end of the coil.

[0005] Preferably, the coil is of a cylindrical structure. The outer diameter of the coil is less than or equal to 1995 mm. The end insulation is an insulating annular columnar structure. The inter-turn insulation is an insulating annular plate-like structure.

[0006] Preferably, the inner shielded winding structure adopted by the coil is that every two adjacent pancake coils are connected by a connecting wire or a bottom wire, and a shielding wire is provided between the turns of each pancake coil.

[0007] Preferably, the insulating layer is a filler-free epoxy resin cast in a vacuum state.

[0008] Preferably, the terminal also includes a terminal nut, a connecting rod, and a connecting wire. One end of the terminal nut is connected to the coil. Through the casting of the insulating layer, the terminal nut is fixed on the outer surface of the coil, and the other end of the terminal nut is exposed outside the insulating layer. One end of the connecting rod is connected to the terminal nut, and the other end is connected to one end of the connecting wire. The other end of the connecting wire is connected and fixed to the terminal on the support plate. The upper and lower ends of the support plate are respectively connected to the upper star-shaped frame at the upper end of the coil and the lower star-shaped frame at the lower end of the coil.

[0009] Preferably, the upper star-shaped frame includes at least 3 to 12 upper star-shaped outgoing arms, an upper star-shaped frame shaft for connecting the upper star-shaped outgoing arms, a connecting frame mounted on the upper star-shaped outgoing arms, and connecting frame holes on the connecting frame. The length of each upper star-shaped outgoing arm is greater than the outer radius of the coil. The upper star-shaped frame is connected to the lower star-shaped frame through the connecting frame and the connecting member. The number of the connecting members is equal to the number of the upper star-shaped outgoing arms. The connecting member includes a first connecting member and a second connecting member. The lower star-shaped frame includes lower star-shaped outgoing arms equal in number to the upper star-shaped outgoing arms, a lower star-shaped frame shaft for connecting the lower star-shaped outgoing arms, and lower star-shaped frame holes. The length of each lower star-shaped outgoing arm is greater than the outer radius of the coil.

[0010] Preferably, the connecting frame is at least a plate-like structure perpendicular to the upper star-shaped outgoing arm and parallel to the upper end face of the coil. The connecting frame is arranged at a position adjacent to the inner circle of the coil. There are at least 2 lower star-shaped frame holes on each lower star-shaped outgoing arm. The lower star-shaped frame holes are arranged at a position adjacent to the inner circle of the coil and correspond to the connecting frame holes.

[0011] Preferably, the first connecting member is an "L"-shaped plate member. On at least one side of the first connecting member, there are at least two first holes of the first connecting member corresponding to the holes of the connecting frame, and the holes of the connecting frame and the first holes of the first connecting member are connected by bolts. On the other side of the first connecting member, there are at least two second holes of the first connecting member. The second connecting member is a long plate structure, and the length of the second connecting member is greater than the height of the coil. On the upper side of the second connecting member, there are at least 2 first holes of the second connecting member corresponding to the second holes of the first connecting member, and the second holes of the first connecting member and the first holes of the second connecting member are connected by bolts. On the lower side of the second connecting member, there are at least 2 second holes of the second connecting member equal in number to and corresponding to the holes of the lower star-shaped frame, and the holes of the lower star-shaped frame and the second holes of the second connecting member are connected by bolts.

[0012] Preferably, the upper grading ring is installed on the upper star-shaped outgoing line arm of the upper star-shaped frame, and the lower grading ring is installed on the lower star-shaped outgoing line arm of the lower star-shaped frame.

[0013] Preferably, a support insulator base is further provided at the bottom of the support insulator, and a grounding screw is further provided on the support insulator base.

[0014] The beneficial effects of the present invention are as follows. Compared with the prior art, the ultra-high voltage air-core reactor of the present invention has a compact and novel structure, small volume, light weight, good heat dissipation effect, high withstand voltage, can serve multiple capacities, requires little installation space, and has strong practicability. The outside of the winding is fixed by insulating materials, which is conducive to leaving a pouring channel during vacuum pouring for sufficient pouring and is convenient for placement when winding the coil; the inter-turn insulation of the ring-shaped epoxy board snap-together structure makes the insulation gap uniform and not easily displaced and deformed, greatly improving the production efficiency and product reliability; the insulating layer is a filler-free epoxy resin cast in a vacuum state, cured in one pouring to ensure the overall insulation requirements of the air-core reactor, with good heat dissipation effect and high withstand voltage. The coil clamping structure is simple and easy to connect, which can effectively solve the connection and installation problems of large inductance casting coils. There is no star-shaped frame between the coils, which can effectively reduce the distance between the coils and increase the mutual inductance between the coils; the second connecting member is made of insulating material, which can avoid the problem of heat generation in the magnetic field of the air-core reactor. Description of the Drawings

[0015] Figure 1 is the front view of the ultra-high voltage air-core reactor of the present invention;

[0016] Figure 2 is the top view of the ultra-high voltage air-core reactor of the present invention;

[0017] Figure 3 It is a schematic structural diagram of the coil winding of an extra-high voltage air-core reactor;

[0018] Figure 4 It is a schematic structural diagram of the coil clamping device of the present invention;

[0019] Figure 5 It is Figure 4 A connection schematic diagram of the upper star-shaped frame, the connecting member and the lower star-shaped frame;

[0020] Figure 6 It is Figure 5 The three-view drawings of the first connecting member of the connecting member; Specific embodiments

[0021] The following further describes the present application with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present application.

[0022] As Figure 1 shown, the extra-high voltage air-core reactor of the present invention mainly includes a coil 1, a grading ring and a support insulator 9.

[0023] The coil 1 includes an upper coil 101, a lower coil 102, an insulating layer 2 and at least two terminal blocks 3. The upper coil 101 and the lower coil 102 are connected in series by a connecting rod 8, that is, the nut at the lowermost end of the upper coil 101 and the nut at the uppermost end of the lower coil 102 need to be connected by the connecting rod 8 to connect the upper and lower coils in series. The coil 1 is of a cylindrical structure, and the outer diameter of the coil 1 is less than or equal to 1995 mm.

[0024] The coil 1 adopts an inner shielded winding structure. The coil includes a plurality of pancake coils 107. End insulation is provided at both ends of the coil. An inter-turn insulation 103 is provided between each pancake coil 107. The insulating layer 2 wraps the coil. At least two terminal blocks 3 are connected to the outer side surface of the coil and extend from the outer circle of the coil through the insulating layer 2 to the outside of the coil and are fixed on the support plate 304.

[0025] The end insulation is an insulating annular columnar structure, and the inter-turn insulation 103 is an insulating annular plate-like structure. The materials of the end insulation 102 and the inter-turn insulation 103 are preferably epoxy boards, and the inter-turn insulation 103 more preferably adopts an annular epoxy board snap-together structure.

[0026] As Figure 3 shown, the inner shielded winding structure adopted by the coil is that each adjacent two pancake coils 107 are connected by a connecting wire 104 or a bottom wire 106; a shielding wire 105 is provided between the turns of each pancake coil 107.

[0027] As Figure 2As shown, the insulating layer 2 wraps the winding. The insulating layer 2 is unfilled epoxy resin cast in a vacuum state and cured in one casting to ensure the overall insulation requirements of the air-core reactor, with good heat dissipation effect and high withstand voltage. Before casting the insulating layer 2, the outside of the winding is wrapped and fixed with insulating materials, which is beneficial to reserving a casting channel during vacuum casting to achieve better casting effect.

[0028] As Figure 2 shown, at least two terminal blocks 3 pass through the insulating layer 2 from the outer circle of the winding and extend to the outside of the winding, and are fixed on the support plate 304 for convenient external wiring. The terminal block 3 also includes a terminal nut 301, a connecting rod 302 and a connecting wire 303. One end of the terminal nut 301 is connected to the coil. Through the casting of the insulating layer 2, the terminal nut 301 is fixed on the outer surface of the coil, and the other end of the terminal nut 301 is exposed outside the insulating layer 2. One end of the connecting rod 302 is connected to the terminal nut 301, and the other end is connected to one end of the connecting wire 303. The other end of the connecting wire 303 is connected and fixed to the terminal block 3 on the support plate 304. As Figure 1 shown, the upper and lower ends of the support plate 304 are respectively connected to the upper star-shaped outgoing line arm 401 of the upper star-shaped frame 4 at the upper end of the coil and the lower star-shaped outgoing line arm 501 of the lower star-shaped frame 5 at the lower end of the coil.

[0029] As Figure 1 shown, the upper coil 101 and the lower coil 102 are clamped and connected by a coil clamping device.

[0030] The coil clamping device includes an upper star-shaped frame 4, a lower star-shaped frame 5 and a connecting member. The upper and lower ends of the coil are respectively provided with grooves with a set depth and width according to the number and thickness of the arms of the star-shaped frame. The upper star-shaped frame 4 is installed at the upper end of the coil 1 and embedded in the groove. The lower star-shaped frame 5 is installed at the lower end of the coil 1 and embedded in the groove. The upper star-shaped frame 4 is connected to the lower star-shaped frame 5 through a connecting member and clamps the coil 1 up and down. The rigid second connecting member 07 of the clamping device supports the coil around the inner wall of the coil to make the whole form a stable structure.

[0031] As Figure 4 shown, the upper star-shaped frame 4 includes at least 3 to 12 upper star-shaped outgoing line arms 401, an upper star-shaped frame shaft 402 for connecting the upper star-shaped outgoing line arms 401, a connecting frame 403 installed on the upper star-shaped outgoing line arms 401 and a connecting frame hole 404 on the connecting frame 403, and the length of each upper star-shaped outgoing line arm 401 is greater than the outer radius of the coil 1. At least one upper star-shaped frame groove 405 is also provided on each upper star-shaped outgoing line arm 401 for being wound together by non-woven tape to ensure the relative positions of the upper star-shaped outgoing line arms 401 of the upper star-shaped frame remain unchanged.

[0032] The connecting frame 403 is at least a plate-like structure perpendicular to the upper star-shaped outgoing line arm 401 and parallel to the upper end face of the coil 1. More preferably, the connecting frame 403 further includes at least two right-angled triangular plate-like structures perpendicular to the upper star-shaped outgoing line arm 401 and the upper end face of the coil 1. The connecting frame hole 404 is provided on the plate-like structure parallel to the upper end face of the coil 1. The connecting frame 403 is arranged at a position adjacent to the inner circle of the coil 1.

[0033] The upper star-shaped frame 4 is connected to the lower star-shaped frame through the connecting frame 403 and the connecting members. The number of the connecting members is equal to the number of the upper star-shaped outgoing line arms 401. The connecting members include the first connecting member 406 and the second connecting member 407.

[0034] The lower star-shaped frame 5 includes lower star-shaped outgoing line arms 501 equal in number to the upper star-shaped outgoing line arms 401, a lower star-shaped frame shaft 502 for connecting the lower star-shaped outgoing line arms 501, and lower star-shaped frame holes 503. And the length of each lower star-shaped outgoing line arm 501 is greater than the outer radius of the coil 1. At least one lower star-shaped frame groove 504 is further provided on each lower star-shaped outgoing line arm 501 for being wound together by a non-woven tape to ensure the relative positions of the lower star-shaped outgoing line arms 501 of the lower star-shaped frame remain unchanged.

[0035] There are at least two lower star-shaped frame holes 503 on each lower star-shaped outgoing line arm 501. The lower star-shaped frame holes 503 are arranged at positions adjacent to the inner circle of the coil 1 and correspond to the connecting frame holes 404.

[0036] As Figure 6 shown, the first connecting member 406 is an "L"-shaped plate-like member. At least two first holes 40601 of the first connecting member corresponding to the connecting frame holes 404 are provided on one side surface of the first connecting member 406. And the connecting frame holes 404 and the first holes 40601 of the first connecting member are connected by bolts. At least two second holes 40602 of the first connecting member are provided on the other side surface of the first connecting member 406. There is a predetermined width gap between the first connecting member 406 and the connecting frame 403, so that the tightness of the coil clamping structure can be adjusted.

[0037] The second connecting member 407 is a long strip plate-like structure. The length of the second connecting member 407 is greater than the height of the coil 1. At least two first holes 40701 of the second connecting member corresponding to the second holes 40602 of the first connecting member are provided on the upper side of the second connecting member 407, and bolts are used to connect between the second holes 40602 of the first connecting member and the first holes 40701 of the second connecting member. At least two second holes 40702 of the second connecting member equal in number to and corresponding to the holes 503 of the lower star-shaped frame are provided on the lower side of the second connecting member 407, and bolts are used to connect between the holes 503 of the lower star-shaped frame and the second holes 40702 of the second connecting member.

[0038] Those skilled in the art need to understand that for each structure connected by bolts, a washer is sleeved at one end of the bolt head, and a flat washer and a spring washer are sleeved at the nut end to prevent the bolt from slipping and affecting safety.

[0039] The using method of the coil clamping structure in the present invention:

[0040] First, as Figure 5 shown, slots equal in number to the upper star-shaped outgoing line arms 401 and capable of accommodating the upper star-shaped outgoing line arms 401 and the lower star-shaped outgoing line arms 501 are respectively opened on the upper end surface of the upper coil 101 and the lower end surface of the lower coil 102.

[0041] Secondly, the upper star-shaped frame 4 and the lower star-shaped frame 5 are respectively dropped into the corresponding slots.

[0042] Finally, after the first connecting member 406 and the second connecting member 407 are firmly connected, and then the second connecting member 407 and the lower star-shaped frame 5 are firmly connected, and finally the first connecting member 406 and the upper star-shaped frame 4 are firmly connected, so that the second connecting member 407 is adjacent to the inner wall of the extra-high voltage hollow reactor coil 5.

[0043] As Figure 1 shown, the grading ring includes an upper grading ring 6 and a lower grading ring 7. The upper grading ring 6 is installed on the upper star-shaped outgoing line arms 401 of the upper star-shaped frame 4, and the lower grading ring 7 is installed on the lower star-shaped outgoing line arms 501 of the lower star-shaped frame 5.

[0044] The support insulator 9 is installed at the lower end of the coil 1. A support insulator base 901 is further provided at the bottom of the support insulator 9, and a grounding screw 902 is further provided on the support insulator base 901.

[0045] The beneficial effects of the present invention are as follows. Compared with the prior art, the ultra-high voltage air-core reactor of the present invention has a compact and novel structure, small volume, light weight, good heat dissipation effect, high withstand voltage, can serve multiple capacities, requires little installation space, and has strong practicability. The outside of the winding is wrapped and fixed with insulating materials, which is conducive to reserving a pouring channel for full pouring during vacuum casting and is convenient to place when winding the coil; the inter-segment insulation of the ring-shaped epoxy board snap-fit structure makes the insulation gap uniform and not easily displaced or deformed, greatly improving the production efficiency and product reliability; the insulating layer is a filler-free epoxy resin cast in a vacuum state and cured in one step to ensure the overall insulation requirements of the air-core reactor, with good heat dissipation effect and high withstand voltage. The coil clamping structure is simply connected and has a simple structure, which can effectively solve the connection and installation problems of large inductance casting coils. There is no star-shaped frame between the coils, which can effectively reduce the distance between the coils and increase the mutual inductance of the coils; the second connecting member is made of insulating materials, which can avoid the problem of heat generation in the magnetic field of the air-core reactor.

[0046] The applicant of the present invention has made a detailed description and illustration of the embodiments of the present invention in conjunction with the accompanying drawings of the specification. However, those skilled in the art should understand that the above embodiments are only the preferred implementation schemes of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, rather than a limitation on the protection scope of the present invention. On the contrary, any improvement or modification based on the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. A ultra-high voltage air-core reactor, comprising: A coil (1), grading rings, and support insulators (9), characterized in that: The coil (1) includes an upper coil (101), a lower coil (102), an insulating layer (2), and at least two connection terminals (3). The upper coil (101) and the lower coil (102) are connected in series by a connecting rod (8). The upper coil (101) and the lower coil (102) are clamped and connected by a coil clamping device. The coil (1) adopts an inner shielded winding structure. The coil (1) includes a plurality of pancake coils (107). End insulation is provided at both ends of the coil (1). Inter-segment insulation (103) is provided between each of the pancake coils (107). The insulating layer (2) wraps the coil (1). At least two of the connection terminals (3) are connected to the outer side surface of the coil (1) and extend from the outer circle of the coil (1) through the insulating layer (2) to the outside of the coil (1), and are fixed on a support plate (304). The coil clamping device includes an upper star-shaped frame (4), a lower star-shaped frame (5), and a connecting member. Grooves with a set depth and width are respectively formed at the upper end part and the lower end part of the coil (1) according to the number of arms and the arm thickness of the star-shaped frame. The upper star-shaped frame (4) is installed at the upper end part of the coil (1) and is embedded in the groove. The lower star-shaped frame (5) is installed at the lower end part of the coil (1) and is embedded in the groove. The upper star-shaped frame (4) is connected to the lower star-shaped frame (5) by the connecting member and clamps the coil (1) up and down. The rigid second connecting member (407) of the clamping device supports the coil around the inner wall of the coil so that the whole forms a stable structure. The grading rings include an upper grading ring (6) and a lower grading ring (7), which are respectively installed on the upper star-shaped frame (4) and the lower star-shaped frame (5). The support insulator (9) is installed at the lower end part of the coil (1).

2. The ultra-high voltage air-core reactor according to claim 1, characterized in that: The coil (1) is of a cylindrical structure. The outer diameter of the coil (1) is less than or equal to 1995 mm. The end insulation is an insulating annular columnar structure. The inter-segment insulation (103) is an insulating annular plate-like structure.

3. The ultra-high voltage air-core reactor according to claim 1, characterized in that: The inner shielded winding structure adopted by the coil (1) is that each adjacent two of the pancake coils (107) are connected by a connecting wire (104) or a bottom wire (106). Shielding wires (105) are provided between the turns of each pancake coil (107).

4. The ultra-high voltage air-core reactor according to any one of claims 1 to 3, characterized in that: The insulating layer (2) is a filler-free epoxy resin cast in a vacuum state.

5. The ultra-high voltage air-core reactor according to any one of claims 1 to 3, characterized in that: The connection terminal (3) further includes a connection nut (301), a connecting rod (302), and a connecting wire (303). One end of the connection nut (301) is connected to the coil (1). Through the casting of the insulating layer (2), the connection nut (301) is fixed on the outer surface of the coil (1), and the other end of the connection nut (301) is exposed outside the insulating layer (2). One end of the connecting rod (302) is connected to the wiring nut (301), and the other end is connected to one end of the connecting wire (303). The other end of the connecting wire (303) is connected and fixed to the wiring terminal (3) on the support plate (304). The upper and lower ends of the support plate (304) are respectively connected to the upper star-shaped frame (4) at the upper end of the coil (1) and the lower star-shaped frame (5) at the lower end of the coil (1).

6. The ultra-high voltage air-core reactor according to claim 1, characterized in that: The upper star-shaped frame (4) includes at least 3 to 12 upper star-shaped outgoing wire arms (401), an upper star-shaped frame shaft (402) for connecting the upper star-shaped outgoing wire arms (401), a connecting frame (403) mounted on the upper star-shaped outgoing wire arms (401), and a connecting frame hole (404) on the connecting frame (403). The length of each upper star-shaped outgoing wire arm (401) is greater than the outer radius of the coil (1). The upper star-shaped frame (4) is connected to the lower star-shaped frame through the connecting frame (403) and the connecting member. The number of the connecting members is equal to the number of the upper star-shaped outgoing wire arms (401). The connecting member includes a first connecting member (406) and a second connecting member (407). The lower star-shaped frame (5) includes lower star-shaped outgoing wire arms (501) equal in number to the upper star-shaped outgoing wire arms (401), a lower star-shaped frame shaft (502) for connecting the lower star-shaped outgoing wire arms (501), and lower star-shaped frame holes (503). The length of each lower star-shaped outgoing wire arm (501) is greater than the outer radius of the coil (1).

7. The ultra-high voltage air-core reactor according to claim 6, characterized in that: The connecting frame (403) is at least a plate-like structure perpendicular to the upper star-shaped outgoing wire arm (401) and parallel to the upper end face of the coil (1). The connecting frame (403) is arranged at a position adjacent to the inner circle of the coil (1). Each lower star-shaped outgoing wire arm (501) has at least 2 lower star-shaped frame holes (503). The lower star-shaped frame holes (503) are arranged at a position adjacent to the inner circle of the coil (1) and correspond to the connecting frame holes (404).

8. The ultra-high voltage air-core reactor according to claim 6, characterized in that: The first connecting member (406) is an "L"-shaped plate-like member. On one side of the first connecting member (406), at least two first holes of the first connecting member (40601) corresponding to the connecting frame holes (404) are provided. The connecting frame holes (404) and the first holes of the first connecting member (40601) are connected by bolts. On the other side of the first connecting member (406), at least two second holes of the first connecting member (40602) are provided. The second connecting member (407) is a long strip plate-like structure. The length of the second connecting member (407) is greater than the height of the coil (1). On the upper side of the second connecting member (407), there are at least two first holes (40701) of the second connecting member corresponding to the second holes (40602) of the first connecting member, and the second holes (40602) of the first connecting member and the first holes (40701) of the second connecting member are connected by bolts. On the lower side of the second connecting member (407), there are at least two second holes (40702) of the second connecting member that are equal in number to and corresponding to the holes (503) of the lower star-shaped frame, and the holes (503) of the lower star-shaped frame and the second holes (40702) of the second connecting member are connected by bolts.

9. The ultra-high voltage air-core reactor according to claim 1, wherein: The upper grading ring (6) is installed on the upper star-shaped outgoing line arm (401) of the upper star-shaped frame (4). The lower grading ring (7) is installed on the lower star-shaped outgoing line arm (501) of the lower star-shaped frame (5).

10. The ultra-high voltage air-core reactor according to claim 1, wherein: At the bottom of the support insulator (9), there is also a support insulator base (901). On the support insulator base (901), there is also a grounding screw (902).

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