CN116260067A - 72.5kV single-tank type environment-friendly gas insulation GIS structure for offshore wind power tower - Google Patents

Abstract

The utility model discloses a 72.5kV single-tank type environment-friendly gas insulation GIS structure for an offshore wind power tower, which is characterized in that a generator side transformer of an upper fan is connected, the lower side of the generator side transformer is connected with sea cables at two sides of the wind power tower, a second cavity for establishing a second-level pressure difference improves the gas pressure intensity and insulation capacity in an insulation cylinder, and the problem that the mechanical life of the existing vacuum bellows technology in a 5-6 Mpa high-pressure gas environment is difficult to reach standards is solved; the three-station switch adopts an innovative L-shaped direct-acting double-contact structure, and fully utilizes the three-dimensional space size; the insulating disc adopts a dielectric constant functional gradient material to improve the overall insulating performance; the vibration-resistant base combining the gas spring and the hydraulic cylinder is adopted to realize vibration absorption and energy consumption; the insulating gas adopts clean air, accords with the carbon neutralization policy, is the development direction in the future, integrates all high-voltage switches in a jar body, and the size reduces by a wide margin, compact structure saves area, is convenient for arrange in an offshore wind turbine tower section of thick bamboo, and the risk point of gas leakage, electric leakage is few, possesses the cost advantage.

Description

A 72.5kV single-tank environmentally friendly gas-insulated GIS structure for offshore wind power towers

technical field

The invention relates to the field of electric power equipment, in particular to a 72.5kV single-tank environment-friendly gas-insulated GIS structure for offshore wind power towers.

Background technique

For large-capacity and long-distance offshore wind power transmission projects, the single-unit capacity of wind turbines continues to increase, and the voltage level of wind farm power collection systems also increases. The current maximum capacity is 12MW, and there may be 15MW or even 20MW offshore wind turbines in the future. In response to the technical trend of 10MW and above wind turbines in the future, the 72.5kV offshore wind power GIS (gas insulated switchgear) power collection scheme will become the mainstream, while the current mature scheme for wind tower power collection switches is 35kV ring main unit, the voltage level It cannot meet the requirements; on the other hand, the land high-voltage 72.5kV GIS layout method cannot meet the system wiring method of offshore wind power towers.

In order to solve the above problems, a Chinese patent with publication number CN215071312U discloses a three-phase common box-type GIS structure for a wind power tower, including a control cabinet and a circuit breaker connected to the control cabinet for telecommunications, a first isolating grounding switch, The second isolating earth switch, the third isolating earth switch, the first current transformer and the voltage transformer; the first isolating earth switch and the second isolating earth switch are arranged vertically, and the third isolating earth switch is arranged horizontally; The lower part of an isolating grounding switch is provided with a first cable terminal for electrical connection; the lower part of a second isolating grounding switch is provided with a second cable terminal for electrical connection; the second current transformer is provided with a third cable terminal for electrical connection; the first cable terminal Wire the second cable end down and the third cable end up. The GIS structure of the utility model reduces the space occupied by cable bending, has a compact structure and a small footprint, and is convenient to be arranged in the fan tower.

Another example is the Chinese patent with the publication number CN113970527A disclosing a method for indoor unmanned inspection of a wind farm offshore booster station GIS, which belongs to the technical field of unmanned inspection of booster stations. Use the unmanned inspection robot to measure the SF6 gas concentration and WIFI signal strength by moving to different locations under control, get the relative distance between each location point based on the received WIFI signal strength, calculate the spatial coordinates of different locations, and realize the inspection The spatial positioning of the robot; after obtaining the gas concentration values at different coordinates, use the gas diffusion theory to estimate the gas concentration at any position; use the residual error between the measured value and the estimated value to correct the gas diffusion model to obtain accurate calculation data. Obtain the indoor gas concentration distribution map, and the point with the highest concentration is the gas leakage point. The device used in the present invention is simple and low in operation cost, and can accurately monitor the SF6 concentration at all positions in the GIS room of the offshore booster station through unmanned inspection, thereby ensuring the safety and stability of the operation of the offshore booster station.

At present, the existing gas insulation structure for offshore wind power towers still has shortcomings: the third cable terminal of the first patented offshore wind power GIS scheme adopts a single-phase box-type structure, and the third cable terminal includes three single-phase box-type structures. The sub-cable terminal, the splicing scheme of multiple functional boxes, and one more splicing link has one more risk point of air leakage and insulation failure, which requires an extra space and an additional splicing component cost. The second patented offshore wind power GIS solution uses SF6 gas as the insulating medium, which does not meet environmental protection requirements, and the existing technology still needs to be improved.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a 72.5kV single-tank environment-friendly gas-insulated GIS structure for offshore wind power towers to solve the above problems.

To achieve the above object, the present invention is achieved through the following technical solutions:

A 72.5kV single-tank environmentally friendly gas-insulated GIS structure for offshore wind power towers, mainly including the following parts: tank body, first cable room, second cable room, third cable room, first three-station mechanism room, second The second and third station mechanism room, the third and third station mechanism room, the circuit breaker mechanism room, the central control room, and the base, the tank body includes the first and third station switches, the second and third station switches, and the third and third station switches , circuit breaker switch, first busbar, second busbar, third busbar, first insulating outlet tray, second insulating outlet tray, third insulating outlet tray, fourth insulating support tray, top cover; the first three One end of the switch, the second three-position switch, and the third three-position switch are connected to the circuit breaker switch, and the other end is respectively connected to the first insulated outlet tray and the second insulated outlet tray through the first bus bar, the second bus bar, and the third bus bar , The third insulating outlet plate, which forms the primary high-voltage main circuit part, is installed in a single sealed tank.

Further, the first insulating outlet tray, the second insulating outlet tray, the third insulating outlet tray, and the top cover are all equipped with sealing rings and mounted on the tank body through bolts, and the insulating cylinder, the outlet conductive seat, and the vacuum interrupter housing An independent first cavity is formed between the end face and the first bellows, and a sealing ring is installed between the two connecting end faces as an air seal, and the clean air with an air pressure of 2-3Mpa is filled to maintain a relatively low pressure to protect the vacuum bubble moving end bellows .

Further, the first three-position switch is composed of a first insulating support plate, a first isolating switch support seat, a first grounding switch grounding seat, and a first isolating switch movable contact, and the first three-position switch adopts an L-shaped Direct-acting double-contact structure, the direct-acting double-contact is driven by a single operating shaft.

Further, the second three-position switch is composed of a second insulating support plate, a second isolating switch support seat, a second grounding switch moving terminal, and a second isolating switch moving contact.

Further, the third three-position switch is composed of a third insulating support plate, a third isolating switch support base, a third earthing switch moving terminal, and a third isolating switch moving contact.

Further, the circuit breaker switch is composed of an insulating cylinder, a circuit breaker outlet seat, a circuit breaker vacuum interrupter, and a switch static end support.

Further, the insulating cylinder, the second bellows, and the top cover of the tank form a second cavity, the air pressure in the second cavity can be superimposed on the basis of the air pressure in the first cavity, and the pressure difference between the cavities is smaller than that of the second bellows The maximum withstand pressure, the maximum can be filled with 5Mpa insulating gas.

Further, a first cable room, a second cable room, a third cable room, a circuit breaker mechanism room, a first three-station mechanism room, a second three-station mechanism room, and a third three-station mechanism are installed outside the tank room, HSBC room.

Further, the bottom of the tank is equipped with a base, the base is divided into two layers, the top layer is a steel base welded by I-shaped steel, the four corners of the bottom of the steel frame are respectively equipped with gas springs, and multiple hydraulic cylinders are installed around the gas springs. The hydraulic rod is arranged vertically, and both the hydraulic cylinder and the gas spring can move up and down.

Further, the fourth insulating support plate is installed on the tank body, the switch static end support is installed on the fourth insulating support plate, the upper end of the switch static end support is electrically connected to the static end of the vacuum interrupter of the circuit breaker, and the circuit breaker vacuum interrupter The moving end of the arc chamber is electrically connected to the outlet seat of the circuit breaker, and the outlet seat of the circuit breaker is equipped with an insulating cylinder, and the upper end of the insulating cylinder is clamped on the end cover.

Compared with the prior art, the beneficial effect of the present invention lies in: a 72.5kV single-tank environment-friendly gas-insulated GIS structure for an offshore wind power tower, which is connected to the wind turbine generator side transformer at the top and connected to the submarine cables on both sides of the wind power tower at the bottom. The establishment of a second cavity with a secondary pressure difference improves the gas pressure and insulation capacity in the insulating cylinder, and solves the problem that the mechanical life of the existing vacuum bubble bellows technology is difficult to meet the standard in a 5-6Mpa high-pressure gas environment; the first and third position switches adopt The innovative L-shaped direct-acting double-contact structure makes full use of the three-dimensional space; the insulating plate adopts the dielectric constant functional gradient material FGM to improve the overall insulation performance; the anti-seismic base combined with the gas spring and the hydraulic cylinder realizes shock absorption and energy consumption; The insulating gas uses clean air, which is the future development direction. All high-voltage switches are integrated into one tank, which greatly reduces the size, compact structure, and saves floor space. Less, with cost advantages.

Description of drawings

Fig. 1 is a 72.5kV single-tank type environmental protection gas insulation GIS structure cross-sectional view of a kind of offshore wind power tower of the present invention;

Fig. 2 is a structural appearance diagram of a 72.5kV single-tank environmental protection gas insulation GIS for an offshore wind power tower of the present invention;

Fig. 3 is a scheme diagram of a 72.5kV single-tank environmental protection gas insulation GIS structure for an offshore wind power tower of the present invention;

Fig. 4 is a schematic structural diagram of a 72.5kV single-tank environmental protection gas-insulated GIS structure base for an offshore wind power tower of the present invention;

Fig. 5 is a schematic diagram of the dielectric constant gradient of a 72.5kV single tank type environmental protection gas insulation GIS structure insulation outlet plate for an offshore wind power tower of the present invention;

Fig. 6 is a 72.5kV single-tank environment-friendly gas-insulated GIS structure L-shaped first three-position switch opening diagram for an offshore wind power tower of the present invention;

Fig. 7 is a grounding diagram of a 72.5kV single-tank environmentally friendly gas-insulated GIS structure L-type first three-position switch for an offshore wind power tower of the present invention;

Fig. 8 is a closing diagram of a 72.5kV single-tank environmentally friendly gas-insulated GIS structure L-type first three-position switch for an offshore wind power tower of the present invention;

Fig. 9 is a cross-sectional view of a 72.5kV single-tank environmentally friendly gas-insulated GIS structure circuit breaker for an offshore wind power tower according to the present invention; 104a-first cavity, 104b-second cavity, 104c-vacuum cavity, 1040-circuit breaker Moving contact, 1041-insulation cylinder, 1045-first bellows, 1046-second bellows, 1047-outlet conductive seat, 1048-insulation pull rod, 1049-tank top cover.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

The present invention provides a technical solution: a 72.5kV single-tank environmentally friendly gas-insulated GIS structure for offshore wind power towers, which mainly includes the following parts: tank body 1, first cable room 2, second cable room 3, third cable Room 4, the first three-station mechanism room 5, the second three-station mechanism room 6, the third three-station mechanism room 7, the circuit breaker mechanism room 8, the control room 9, and the base 10. The tank body 1 includes The first three-position switch 101, the second three-position switch 102, the third three-position switch 103, the circuit breaker switch 104, the first bus bar 105, the second bus bar 106, the third bus bar 107, and the first insulating outlet tray 108 , the second insulating outlet tray 109, the third insulating outlet tray 110, the fourth insulating support tray 111, the top cover 112; the first three-position switch 101, the second three-position switch 102, the third three-position switch One end of 103 is connected to the circuit breaker switch 104, and the other end is respectively connected to the first insulating outlet tray 108, the second insulating outlet tray 109, and the third insulating outlet tray 110 through the first bus bar 105, the second bus bar 106, and the third bus bar 107, forming The high-voltage primary main circuit part is installed in a single sealed tank body 1 .

The first insulating outlet tray 108, the second insulating outlet tray 109, the third insulating outlet tray 110 and the top cover 112 are all equipped with sealing rings and mounted on the tank body 1 by bolts to form a first airtight cavity, which is filled with There is 5~6Mpa clean air as the insulating gas. The insulating outlet tray is made of advanced dielectric constant functionally graded material (FGM). FGM refers to the distribution of fillers with different dielectric strengths (Si0, Al20g, TiO, SrTiOg) in different parts of the insulating substrate (usually epoxy resin). ) to achieve the structure of the gradient arrangement of the dielectric constant of the insulating part. The preparation methods of FGM insulators currently include lamination method, centrifugal method, 3D printing and flexible casting method. According to the use scene of the pot insulator, the electric field near the electrode 300 is the strongest. By FGM, the relative permittivity of the surface of the insulator near the electrode 300 is increased (ε=10), and then decreased along the surface (ε=4), which can reduce the surface discharge. And can reduce the pot insulator size. In general, the size of the disc insulator determines the size of the gas chamber of the GIS. So reducing the size of the disc insulator will also reduce the size of the GIS gas chamber.

The circuit breaker switch 104 is composed of an insulating cylinder 1041 , a circuit breaker outlet seat 1042 , a circuit breaker vacuum interrupter 1043 , and a switch static end support 1044 . In the present invention, an independent first cavity 104a is formed between the insulating cylinder 1041, the outlet conductive seat 1047, the end face of the circuit breaker vacuum interrupter 1043 shell, and the first bellows 1045, and a sealing ring is installed between the two connecting end faces for gas. Sealed, filled with clean air with 2-3Mpa air pressure, and maintain a relatively low pressure to protect the vacuum bubble bellows at the moving end, so as to solve the problem that the mechanical life of the existing vacuum bubble bellows technology is difficult to meet the standard in the 5-6Mpa high-pressure gas environment. The second bellows 1046, insulating cylinder 1041, and tank top cover 1049 form the second cavity 104b. The air pressure in the second cavity 104b can be superimposed on the basis of the air pressure in the first cavity 104a, and the pressure difference between the cavities is smaller than that of the second bellows The maximum withstand pressure of 1046. It can be filled with insulating gas up to 5Mpa. From the perspective of increasing the pressure of the insulating gas, the insulation performance per unit distance in the cavity can be improved, thereby shortening the clear distance between conductors and the surface creepage of the insulating part, and making the insulating part (insulating rod/insulating cylinder) as a whole Size reduction. Miniaturize the structure of the insulating part of the circuit breaker.

The first cable chamber 2 is equipped with a first cable terminal 201, the second cable chamber 3 is equipped with a second cable terminal 301, and the third cable chamber 4 is equipped with a third cable terminal 401, and a feed-through current transformer is optional. 202, rear plug-in arrester 302, the shell of the cable room plays the role of structural support and prevention of marine environmental pollution.

The first three-station mechanism chamber 5, the second three-station mechanism chamber 6, the third three-station mechanism chamber 7 and the circuit breaker mechanism chamber 8 are equipped with the operating mechanisms of their respective switches, and the housing of the mechanism chamber serves as a structural support and prevent marine environmental pollution.

The control room 9 is equipped with electronic control components, relay protection, metering components, etc., and is used to control the circuit breaker, the first three-position switch 101, the second three-position switch 102, and the third three-position switch through electrical signals. 103. The shell of the control room plays the role of structural support and prevention of marine environmental pollution.

The first three-position switch 101 is composed of a first insulating support plate 1011 , a first isolating switch supporting base 1012 , a first grounding switch grounding base 1013 , and a first isolating switch moving contact 1014 . The first three-position switch 101 adopts an L-shaped direct-acting double-contact structure, and the direct-acting double-contact is driven by a single operation shaft, which can realize mutual exclusive interlocking of stations in the direct-acting single-contact three-position switch scheme, without existence The case where both switches are closed at the same time. The main gear 206 is installed on the main shaft of the mechanism, and the main gear 206 is an incomplete spur gear with a relief groove, which is symmetrically arranged on both sides of the slave gear. The ground driven gear 207, the isolation driven gear/205 mesh with the spur gear. The ground synchronous gear 203 is arranged inside the main gear 206 , and the isolated synchronous gear 204 is arranged outside and inside the main gear 206 . The ground synchronous gear 203 rotates synchronously with the ground driven gear 207 and meshes with the ground switch rack 202 ; the isolation synchronous gear 204 rotates synchronously with the isolation driven gear 205 and meshes with the isolation switch rack 201 . The grounding switch rack 202 is hard-connected to the grounding switch movable contact 1015 , and the isolating switch rack 201 is hard-connected to the first isolating switch moving contact 1014 . The moving contact 1015 of the grounding switch and the moving contact 1014 of the first isolating switch are sleeved in the supporting base 1012 of the first isolating switch.

Figure 6 shows the closed state of the first three-position switch 101, the main shaft of the mechanism drives the main gear 206 to rotate clockwise at a certain angle (65°), drives the grounding driven gear 207, and the grounding switch rack and pinion drives the grounding switch moving contact 1015 Insert it into the ground seat 1013 of the first grounding switch to complete the grounding closing. Simultaneously, the main gear 206 makes way for the isolation driven gear 205, and the first isolating switch movable contact 1014 does not act and remains at the isolation position. The main gear 206 reversely rotates the same angle, and the grounding switch is opened. The main shaft of the mechanism drives the main gear 206 to rotate counterclockwise at a certain angle (65°), drives the isolation driven gear 205, and the rack and pinion group of the isolation switch drives the first isolation switch movable contact 1014 to insert into the isolation switch closing seat 1016 to complete the isolation switch. brake. Simultaneously, the main gear 206 makes way for the grounding driven gear 207, and the grounding switch moving contact 1015 does not act and remains in the grounding position. The main gear 206 reversely rotates the same angle, and the isolating switch is opened. The grounding diagram and closing diagram of the L-shaped first three-position switch 101 are shown in Fig. 7 and Fig. 8 respectively.

The direct-acting single-contact three-position switch scheme adopted by traditional GIS needs to occupy a long space in the direction of contact movement (X direction), and the L-shaped direct-acting double-contact three-position switch of the present invention only occupies half of the space in the X direction The other half of the space turns to the Y direction. This structure is more conducive to the compact arrangement of the GIS structure with multiple switches in one box.

The second three-position switch 102 is composed of a second insulating support plate 1021 , a second isolating switch supporting seat 1022 , a second grounding switch moving end 1023 , and a second isolating switch moving contact 1024 .

The third three-position switch 103 is composed of a third insulating support plate 1031 , a third isolating switch supporting seat 1032 , a third earthing switch moving end 1033 , and a third isolating switch moving contact 1034 .

The function of the three-position switch is divided into an isolating switch and a grounding switch. The isolating switch adopts a direct-acting structure with better field strength than the knife-type structure. The moving contact directly moves out of the isolating switch support seat and enters the closing seat. Closing; the moving contact moves directly into the supporting seat of the isolating switch, and the isolating switch opens. The first isolating switch closing seat 1016 is integrated on the circuit breaker outlet seat 1042, and the second isolating switch closing seat and the third isolating switch closing seat are integrated on the circuit breaker switch static end support.

The grounding switch of the first three-position switch 101 is a slow direct-acting structure, the moving end is on the high-voltage side, and the grounding moving contact is closed when it completely overlaps the grounding seat 1013 of the first grounding switch, and the grounding moving contact completely enters the isolating switch Support seat 1012 o'clock opening.

The grounding switch of the second three-position switch 102 and the third three-position switch 103 is a fast direct-acting structure with short-circuit current switching capability. When the switch supporting seat 1022 and the third isolating switch supporting seat 1032 are closed, the switch is opened when the grounding movable contact is pulled to a safe insulation distance by the mechanism.

The first three-position switch 101 is arranged on the upper part, and is connected with the upper conductor circuit breaker outlet seat 1042 of the circuit breaker switch 104, and the other end is plugged into the first busbar 105, and the first busbar 105 is fixed on the first insulating outlet tray 108 with bolts , the first cable terminal 201 is installed on the first insulating outlet plate 108 to connect with the fan transformer cable.

The second three-position switch 102 and the third three-position switch 103 are arranged at the bottom, symmetrically distributed on the left and right sides of the circuit breaker switch 104, and connected to the static end support 1044 of the conductor switch at the lower part of the circuit breaker. The other end is plugged into the second busbar 106 and the third busbar 107 respectively, and the second busbar 106 and the third busbar 107 are fixed on the second insulating outlet tray 109 and the third insulating outlet tray 110 with bolts. The second insulating outlet tray 109, The second cable terminal 301 and the third cable terminal 401 are installed on the third insulated outlet tray 110 to connect with the submarine cable ring network on both sides of the wind tower.

The first isolating switch supporting base 1012 is bolted to the first insulating support plate 1011, the second isolating switch supporting base 1022 is bolted to the second insulating supporting plate 1021, and the third isolating switch supporting base 1032 is bolted to the third insulating supporting plate 1031 , the first insulating support plate 1011, the second insulating support plate 1021, and the third insulating support plate 1031 are bolted to the tank body. The first insulating support plate 1011, the second insulating support plate 1021, the third insulating support plate 1031, and the fourth insulating support plate 111 play the role of supporting the isolating switch support seat, and the second is to play the role of the isolating switch support seat and the tank body. insulation between them.

The fourth insulating support plate 111 is installed on the tank body, and the switch static end support 1044 is installed on the plate to play the role of support and insulation. The upper end of the switch static end support 1044 is electrically connected to the static end of the circuit breaker vacuum interrupter 1043, and the moving end of the circuit breaker vacuum interrupter 1043 is electrically connected to the circuit breaker outlet seat 1042, and the circuit breaker outlet seat 1042 is equipped with an insulating cylinder 1041. The upper end of the insulating cylinder 1041 is clamped on the end cap to fix it radially. The insulating cylinder 1041 is equipped with a mechanism cam, a contact spring, and an insulating pull rod, and the insulating pull rod is connected with the vacuum bubble moving end bolt; the mechanism cam is externally connected to the circuit breaker mechanism to drive the circuit breaker to open and close.

The base 10 is divided into two layers, the top layer is a section steel base 1001 welded by I-shaped steel, which is used to connect the tank body, the four corners of the bottom of the section steel frame are respectively equipped with gas springs 1002, and a plurality of hydraulic cylinders 1003 are installed around the gas spring 1002 , the hydraulic rods are arranged vertically, and the hydraulic rods of multiple hydraulic cylinders 1003 are used to support the whole machine. Both the hydraulic cylinder 1003 and the gas spring 1002 can move up and down. The slope of the pressure stroke curve of the hydraulic cylinder 1003 is large. If it is used alone for shock resistance, the swing range of the equipment will be large, which is not conducive to the stability of the cable interface. Therefore, the hydraulic cylinder 1003 mainly plays a supporting role; The spring 1002 has a small slope of the pressure stroke curve, a gentle vibration amplitude, and strong impact resistance, but in case the air bag is deflated, it does not have rigid support capability and needs the support of the hydraulic cylinder 1003. The combined structure has a low natural frequency and can effectively resist earthquakes and sway. The base 10 is used to support the tank body 1 and the cable room support.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (10)

1. The 72.5kV single-tank type environment-friendly gas insulation GIS structure for the offshore wind power tower is characterized by comprising the following parts: the novel high-voltage power supply device comprises a tank body (1), a first cable chamber (2), a second cable chamber (3), a third cable chamber (4), a first three-station mechanism chamber (5), a second three-station mechanism chamber (6), a third three-station mechanism chamber (7), a breaker mechanism chamber (8), a sink control chamber (9) and a base (10), wherein the tank body (1) comprises a first three-station switch (101), a second three-station switch (102), a third three-station switch (103), a breaker switch (104), a first bus (105), a second bus (106), a third bus (107), a first insulating wire outlet disc (108), a second insulating wire outlet disc (109), a third insulating wire outlet disc (110), a fourth insulating support disc (111) and a top cover (112); one end of the first three-station switch (101), one end of the second three-station switch (102) and one end of the third three-station switch (103) are connected with the breaker switch (104), and the other end of the first three-station switch is connected to the first insulating wire outlet disc (108), the second insulating wire outlet disc (109) and the third insulating wire outlet disc (110) through the first bus (105), the second bus (106) and the third bus (107) respectively to form a high-voltage primary main loop part which is arranged in the single sealed tank body (1).

2. The 72.5kV single-tank type environment-friendly gas insulated GIS structure for the offshore wind power tower according to claim 1, wherein the structure is characterized in that: the breaker switch (104) is composed of an insulating cylinder (1041), a breaker outlet seat (1042), a breaker vacuum arc-extinguishing chamber (1043) and an opening Guan Jingduan support (1044).

3. The 72.5kV single-tank type environment-friendly gas-insulated GIS structure for an offshore wind power tower according to claim 2, wherein the structure is characterized in that: an independent first cavity (104 a) is formed between the shell end face of the insulating cylinder (1041), the outgoing line conducting seat (1047), the vacuum arc-extinguishing chamber (1043) of the circuit breaker and the first corrugated pipe (1045), a sealing ring is arranged between the two connecting end faces for air sealing, clean air with the air pressure of 2-3 Mpa is filled, and the relatively low pressure is maintained to protect the corrugated pipe at the vacuum bubbling end.

4. A 72.5kV single-tank type environmental protection gas insulation GIS structure for an offshore wind power tower according to claim 3, wherein: the second corrugated pipe (1046), the insulating cylinder (1041) and the tank top cover (1049) form an independent second cavity (104 b), the air pressure of the second cavity (104 b) can be overlapped on the basis of the air pressure of the first cavity (104 a), and the pressure difference between the cavities is smaller than the maximum tolerance pressure of the second corrugated pipe (1046).

5. The 72.5kV single-tank type environment-friendly gas insulated GIS structure for the offshore wind power tower according to claim 4, wherein the structure comprises the following components: the first three-position switch (101) is composed of a first insulating supporting plate (1011), a first isolating switch supporting seat (1012), a first grounding switch grounding seat (1013) and a first isolating switch moving contact (1014), the first three-position switch (101) adopts an L-shaped direct-acting double-contact structure, and the direct-acting double-contact is driven by a single operation shaft.

6. The 72.5kV single-tank type environment-friendly gas insulated GIS structure for the offshore wind power tower according to claim 5, wherein the structure is characterized in that: the second three-station switch (102) is composed of a second insulating supporting disk (1021), a second isolating switch supporting seat (1022), a second grounding switch moving end (1023) and a second isolating switch moving contact (1024).

7. The 72.5kV single-tank type environment-friendly gas insulated GIS structure for the offshore wind power tower according to claim 6, wherein the structure is characterized in that: the third three-station switch (103) is composed of a third insulation supporting disc (1031), a third isolating switch supporting seat (1032), a third grounding switch movable end (1033) and a third isolating switch movable contact (1034).

8. The 72.5kV single-tank type environment-friendly gas insulated GIS structure for the offshore wind power tower according to claim 7, wherein the structure comprises the following components: the novel solar energy collection tank is characterized in that a first cable chamber (2), a second cable chamber (3), a third cable chamber (4), a first three-station mechanism chamber (5), a second three-station mechanism chamber (6), a third three-station mechanism chamber (7), a breaker mechanism chamber (8) and a collection control chamber (9) are arranged outside the tank body (1).

9. The 72.5kV single-tank type environment-friendly gas insulated GIS structure for the offshore wind power tower according to claim 8, wherein the structure comprises the following components: the tank is characterized in that a base (10) is arranged below the tank body (1), the base (10) is divided into two layers, the top layer is a section steel base (1001) formed by welding I-shaped section steel, gas springs (1002) are respectively arranged at four corners of the bottom of the section steel frame, a plurality of hydraulic cylinders (1003) are arranged on the periphery of each gas spring (1002), the hydraulic rods are arranged in the vertical direction, and the hydraulic cylinders (1003) and the gas springs (1002) can move up and down.

10. The 72.5kV single-tank type environment-friendly gas-insulated GIS structure for an offshore wind power tower according to claim 9, wherein the structure comprises: the fourth insulating supporting disc (111) is installed on the tank body (1), a switch static end support (1044) is installed on the fourth insulating supporting disc (111), the upper end of the switch Guan Jingduan support (1044) is electrically connected with the static end of the circuit breaker vacuum arc-extinguishing chamber (1043), the movable end of the circuit breaker vacuum arc-extinguishing chamber (1043) is electrically connected with the circuit breaker outlet seat (1042), and an insulating cylinder (1041) is installed on the circuit breaker outlet seat (1042).

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