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CN-116260067-B - 72.5KV single-tank type environment-friendly gas insulation GIS structure for offshore wind power tower

CN116260067BCN 116260067 BCN116260067 BCN 116260067BCN-116260067-B

Abstract

The invention 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 transformer at the generator side is connected with sea cables at two sides of the wind power tower, a second cavity for establishing a second-level pressure difference is connected with sea cables at the lower side of the wind power tower, so that the gas pressure and insulation capacity in the insulation cylinder are improved, the problem that the mechanical life of the existing vacuum bellows technology is difficult to reach standards in a high-pressure gas environment of 5-6 Mpa is solved, an innovative L-shaped direct-acting double-contact structure is adopted in a three-station switch, the three-dimensional space size is fully utilized, an insulating disc adopts a dielectric constant functional gradient material to improve the overall insulation performance, an anti-vibration base combined by a gas spring and a hydraulic cylinder is adopted, so that shock absorption and energy consumption are realized, the insulation gas adopts clean air, the carbon neutralization policy is met, all high-voltage switches are integrated in one tank, the size is greatly reduced, the structure is compact, the occupied area is convenient to arrange in the offshore wind power tower, the risk point of leakage is less, and the cost advantage is provided.

Inventors

  • SHANG YU
  • GAO MINGCHUN
  • HUANG CAN
  • YANG YIFEI
  • SU ZHEN
  • YUAN WEI

Assignees

  • 江苏大全长江电器股份有限公司
  • 大全集团有限公司
  • 江苏科技大学

Dates

Publication Date
20260505
Application Date
20230324

Claims (8)

  1. 1. A72.5 kV single-tank type environment-friendly gas insulation GIS structure for an offshore wind power tower is characterized by comprising 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 circuit 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 circuit breaker switch (104), a first bus (105), a second bus (106), a third bus (107), a first insulation outlet disc (108), a second insulation outlet disc (109), a third insulation outlet disc (110), a fourth insulation support disc (111) and a top cover (112), one end of the first three-station switch (101), the second three-station switch (102), the third three-station switch (103) is connected with a circuit breaker switch (104), the other end of the third three-station switch is respectively connected with the first bus (108), the third bus (108) and the third bus (107) through the first bus (108) and the third bus (107) to the first bus (107) and the third bus (107) respectively, install in single sealed tank (1), fourth insulating supporting disk (111) links to each other with circuit breaker switch (104), circuit breaker switch (104) are by insulating cylinder (1041), circuit breaker wire outlet seat (1042), circuit breaker vacuum interrupter (1043), open Guan Jingduan support (1044) and are constituteed, fourth insulating supporting disk (111) are installed on tank (1), install switch quiet end support (1044) on fourth insulating supporting disk (111), open Guan Jingduan support (1044) upper end electricity and link circuit breaker vacuum interrupter (1043) quiet end, circuit breaker vacuum interrupter (1043) movable end electricity link circuit breaker wire outlet seat (1042), are equipped with insulating cylinder (1041) on circuit breaker wire outlet seat (1042).
  2. 2. The 72.5kV single-tank type environment-friendly gas insulation GIS structure for the offshore wind power tower according to claim 1, wherein an independent first cavity (104 a) is formed among the insulating cylinder (1041), the outgoing line conducting seat (1047), the shell end face of 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 pressure of 2-3 mpa is filled, and the vacuum bubbling end corrugated pipe is protected under relatively low pressure.
  3. 3. The 72.5kV single-tank type environment-friendly gas insulation GIS structure for the offshore wind power tower according to claim 2, wherein the second corrugated pipe (1046), the insulation 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).
  4. 4. The 72.5kV single-tank type environment-friendly gas insulation GIS structure for the offshore wind power tower according to claim 3, wherein the first three-position switch (101) is composed of a first insulation 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-movement double-contact structure, and the direct-movement double-contact is driven by a single operation shaft.
  5. 5. The 72.5kV single-tank type environment-friendly gas insulation GIS structure for the offshore wind turbine tower of claim 4, wherein the second three-position switch (102) is composed of a second insulation supporting disc (1021), a second isolating switch supporting seat (1022), a second grounding switch movable end (1023) and a second isolating switch movable contact (1024).
  6. 6. The 72.5kV single-tank type environment-friendly gas insulation GIS structure for the offshore wind turbine tower of claim 5, wherein the third three-position 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).
  7. 7. The 72.5kV single-tank type environment-friendly gas insulation GIS structure for the offshore wind power tower, as claimed in claim 6, 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 convergence control chamber (9) are arranged outside the tank body (1).
  8. 8. The 72.5kV single-tank type environment-friendly gas insulation GIS structure for the offshore wind power tower according to claim 7, wherein 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.

Description

72.5KV single-tank type environment-friendly gas insulation GIS structure for offshore wind power tower Technical Field The invention relates to the field of power equipment, in particular to a 72.5kV single-tank type environment-friendly gas insulation GIS structure for an offshore wind power tower. Background Aiming at large-capacity and remote offshore wind power output projects, the single-machine capacity of a fan is continuously improved, the voltage level of a wind power plant current collection system is also increased, the current maximum capacity is 12MW, and 15MW or even 20MW offshore wind turbines can be generated in the future. In response to the technical trend of wind turbines of 10MW and above in the future, a current collecting scheme of a 72.5kV offshore wind power GIS (gas insulated switchgear) is mainstream, the mature scheme of a current collecting switch for a wind tower is a 35kV ring main unit, the voltage level cannot meet the requirements, and on the other hand, the arrangement mode of a land high-voltage 72.5kVGIS cannot meet the system wiring mode of an offshore wind power tower barrel. In order to solve the problems, as disclosed in China patent with the publication number of CN215071312U, a three-phase common-box GIS structure for a wind power tower comprises a control cabinet, a circuit breaker, a first isolation grounding switch, a second isolation grounding switch, a third isolation grounding switch, a first current transformer and a voltage transformer, wherein the circuit breaker, the first isolation grounding switch, the second isolation grounding switch, the third isolation grounding switch, the first current transformer and the voltage transformer are in telecommunication connection with the control cabinet, the first isolation grounding switch and the second isolation grounding switch are arranged in the vertical direction, the third isolation grounding switch is arranged in the horizontal direction, the lower part of the first isolation grounding switch is provided with a first cable terminal in electrical connection, the lower part of the second isolation grounding switch is provided with a second cable terminal in electrical connection, the second current transformer is provided with a third cable terminal in electrical connection, the first cable terminal and the second cable terminal are downwards connected, and the third cable terminal upwards connected. The GIS structure reduces the space occupied by bending the cable, has compact structure and small occupied area, and is convenient to be arranged in the fan tower. As another example, chinese patent publication No. CN113970527a discloses an unmanned inspection method in a GIS of a booster station on the sea of a wind farm, which belongs to the technical field of unmanned inspection of booster stations. The method comprises the steps of utilizing an unmanned inspection robot to measure SF6 gas concentration and WIFI signal intensity by controlling to move to different position points, obtaining relative distances among the position points based on the received WIFI signal intensity, calculating spatial coordinates of the different position points, achieving spatial positioning of the inspection robot, obtaining gas concentration values at different coordinates, calculating gas concentration at any position by utilizing a gas diffusion theory, correcting a gas diffusion model by utilizing residual errors of measured values and calculated values, obtaining accurate calculation data, and further obtaining an indoor gas concentration distribution diagram, wherein the position with the largest concentration is a gas leakage point. The device used by the invention is simple, the operation cost is low, the accurate monitoring of SF6 concentration at all positions in the GIS room of the offshore booster station can be realized through unmanned inspection, and the operation safety and stability of the offshore booster station are ensured. At present, the existing gas insulation structure for the offshore wind power tower barrel has the defects that the third cable terminal of the offshore wind power GIS scheme of the first patent adopts a single-phase box-separating structure, the third cable terminal comprises three single-phase box-separating sub-cable terminals, the scheme of splicing a plurality of functional boxes is adopted, one more splicing link is one more risk point of air leakage and insulation failure, one more space is required, and the cost of one more splicing component is increased. The second patent offshore wind power GIS scheme adopts SF6 gas as an insulating medium, does not meet the environmental protection requirement of carbon neutralization, and the prior art still needs to be improved. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a 72.5kV single-tank type environment-friendly gas insulation GIS structure for an offshore wind power tower, which aims to solv