A device for preventing sulfur hexafluoride leakage inside a wind turbine tower

Abstract

This invention provides a sulfur hexafluoride (SF6) leakage prevention device inside a wind turbine tower. It includes a gas analysis module mounted on the upper part of a medium-voltage switchgear. A first gas detector, a second gas detector, and a third gas detector are sequentially connected from top to bottom to the lower side of the gas analysis module. These detectors are respectively installed within the medium-voltage switchgear, the tower bottom platform, and the tower base platform. The device also includes an axial flow fan installed within the tower bottom platform. A duct is mounted on one side of the axial flow fan, facing the bottom of the tower base platform. The tower base platform and the gas analysis module are electrically connected. This invention features a compact structure and reasonable design, significantly improving the detection range of SF6 gas inside the tower and ensuring overall safety.

Description

Technical Field

[0001] This utility model relates to the field of gas monitoring technology, and in particular to a device for preventing and controlling sulfur hexafluoride leakage inside a wind turbine tower. Background Technology

[0002] In wind power systems, the interior of the wind turbine tower is enclosed, and electrical equipment such as the medium-voltage switchgear on the tower base platform contains sulfur hexafluoride (SF6). SF6 leaks easily accumulate, reducing the oxygen concentration in the air. SF6 and its decomposition products are toxic, threatening the safety of maintenance personnel. Existing prevention and control measures have shortcomings: First, most monitoring schemes only monitor either SF6 or oxygen concentration, and monitoring points are limited to the vicinity of the equipment, failing to comprehensively cover potential accumulation areas and creating monitoring blind spots. Second, ventilation systems often rely on manual activation and are not linked to gas monitoring data, resulting in slow response times in the event of a leak, leading to continuous gas accumulation. Third, early warning methods are mostly integrated into backend systems, preventing maintenance personnel outside the tower from directly obtaining risk information, delaying timely response.

[0003] Chinese patent document CN 203433355 U describes a sulfur hexafluoride leakage monitoring device, but the structure of the monitoring device is relatively complex; Chinese patent document CN 216050511 U describes a sulfur hexafluoride gas leakage alarm device, which also has the above problems, has defects in use, and needs to be improved. Utility Model Content

[0004] This invention provides a sulfur hexafluoride leakage prevention and control device inside a wind turbine tower, which solves the technical problems of limited coverage area, poor monitoring effect, and inability to automatically pump out and reduce risks in a timely manner.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a sulfur hexafluoride leakage prevention and control device inside a wind turbine tower, including a gas analysis module installed on the upper part of a medium-voltage switchgear, a first gas detector, a second gas detector, and a third gas detector connected sequentially from top to bottom on the lower side of the gas analysis module, the first gas detector, the second gas detector, and the third gas detector being installed in the medium-voltage switchgear, the tower bottom platform, and the tower base platform, respectively, and also including an axial flow fan installed in the tower bottom platform, with a wind duct installed on one side of the axial flow fan, the wind duct facing the bottom of the tower base platform, and the tower base platform and the gas analysis module being electrically connected.

[0006] In the preferred embodiment, a first medium-voltage cable cabinet and a second medium-voltage cable cabinet are respectively installed on both sides of the medium-voltage switchgear. A GIS complete switch is installed inside the medium-voltage switchgear, and the GIS complete switch is connected to the medium-voltage switchgear and the first and second medium-voltage cable cabinets respectively.

[0007] In the preferred embodiment, a vacuum high-voltage contactor is installed inside the second medium-voltage cable cabinet. The two sides of the vacuum high-voltage contactor are connected to the generator and the GIS switch set via high-voltage copper busbars, respectively. The first medium-voltage cable cabinet is connected to the transformer substation via high-voltage copper busbars.

[0008] In the preferred embodiment, the gas analysis module is connected to the alarm light, the electronic control switch, and the axial flow fan via power lines. The alarm light and the electronic control switch are respectively located on one side of the tower door. The first gas detector, the second gas detector, and the third gas detector are respectively connected to the gas analysis module via suction pipes.

[0009] In the preferred embodiment, the gas analysis module is connected to the converter cabinet via a communication line, and the converter cabinet is connected to the central control room via a communication line.

[0010] In a preferred embodiment, a detachable hood is provided at the bottom of the air duct, the hood comprising a first straight cylinder and a first air inlet.

[0011] In the preferred embodiment, the lower side of the air duct is provided with an external thread, and the inner side of the first straight cylinder is provided with an internal thread, with the external thread and the internal thread having the same direction of rotation.

[0012] In a preferred embodiment, the inner side of the first straight cylinder is provided with multiple threaded holes, and the screw passes through the threaded holes with the end of the screw abutting against the outer wall of the air duct.

[0013] In a preferred embodiment, a second air vent is connected to the lower side of the first air vent via a second straight cylinder. The outer diameter of the second air vent is larger than that of the first air vent. The connection between the first air vent and the second straight cylinder forms a buffer space. Multiple baffles are provided circumferentially on the inner side of the first air vent.

[0014] In the preferred embodiment, a filter screen is detachably installed at the lower part of the first cylinder, and multiple grooves are symmetrically provided on the upper side of the first air inlet. The filter screen includes a fixing ring, and two pressure strips are vertically arranged in the middle of the fixing ring. The length of the pressure strips is greater than that of the fixing ring, and the pressure strips are inserted into the grooves.

[0015] The beneficial effects of this utility model are as follows: First, it solves the problem of incomplete monitoring by comprehensively covering the areas where gas may accumulate inside the tower through three detection units at different locations, eliminating blind spots in monitoring. Second, it solves the problem of untimely response by automatically starting ventilation when a leak occurs, reducing the time for gas accumulation. Third, it solves the problem of unintuitive early warning by allowing personnel outside the tower to intuitively understand the risk and avoid delays in handling. Fourth, the equipment is adapted to the harsh environment of the tower, ensuring long-term stable operation, and has manual ventilation start function and historical data storage function, further improving the practicality and reliability of the device and effectively protecting the safety of maintenance personnel. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the present invention. Figure 2 ; Figure 3 This is a circuit control schematic diagram of this utility model; Figure 4 This is a schematic diagram of the wind duct installation cover of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the wind duct installation cover of this utility model. Figure 1 ; Figure 6 yes Figure 4 Explosion structure diagram Figure 1 ; Figure 7 yes Figure 4 Explosion structure diagram Figure 2 ; Figure 8 This is a schematic diagram of the wind shield structure of this utility model.

[0017] In the diagram: 1. First medium-voltage cable cabinet; 2. Medium-voltage switchgear; 3. Second medium-voltage cable cabinet; 4. First gas detector; 5. Second gas detector; 6. Third gas detector; 7. Vacuum high-voltage contactor; GIS 8. Complete set of switches; 9. Power cord; 10. Communication line; 11. Suction pipe; 12. High voltage copper busbar; 13. Alarm light; 14. Electrical control switch; 15. Axial flow fan; 16. Air duct; 1601. External thread; 17. Air cover; 17. First straight cylinder; 1702. First air vent; 1703. Second straight cylinder; 1704. Second air vent; 1705. Internal thread; 1706. Threaded hole; 1707. Groove; 1708. Partition plate; 18. Generator; 19. Converter cabinet; 20. Central control room; 21. Box-type transformer; 22. Gas analysis module; 23. Tower door; 24. Tower base platform; 25. Tower base platform; 26. Guardrail; 27. Filter screen; 2701. Fixing ring; 2702. Pressure strip; 28. Screw; 29. ​​Step ladder. Detailed Implementation

[0018] like Figure 1-2A sulfur hexafluoride leakage prevention and control device inside a wind turbine tower includes a gas analysis module 22 installed on the upper part of a medium-voltage switchgear 2. A first gas detector 4, a second gas detector 5, and a third gas detector 6 are connected sequentially from top to bottom on the lower side of the gas analysis module 22. The first gas detector 4, the second gas detector 5, and the third gas detector 6 are respectively installed in the medium-voltage switchgear 2, the tower bottom platform 24, and the tower base platform 25. The device also includes an axial flow fan 15 installed in the tower bottom platform 24. A duct 16 is installed on one side of the axial flow fan 15, and the duct 16 faces the bottom of the tower base platform 25. The tower base platform 25 and the gas analysis module 22 are electrically connected.

[0019] The gas analysis module 22 is located in the power distribution cabinet at the top of the middle cabinet of the medium-voltage switchgear. It is a sulfur hexafluoride-oxygen integrated analyzer, which simultaneously analyzes the concentration of sulfur hexafluoride gas and oxygen concentration and outputs the analysis data. It works in conjunction with the first gas detector 4, the second gas detector 5, and the third gas detector 6, respectively, and is connected to them via signal cables to receive gas samples collected by the detectors. It is also connected to the axial flow fan 15, which can control the start and stop of the fan. When the concentration is too high, it performs intelligent drainage to reduce the density of sulfur hexafluoride gas in the tower, providing a safety guarantee for the safe operation of the tower and the normal construction work of the personnel.

[0020] The first gas detector 4 is installed inside the medium-voltage switchgear 2 to monitor gas leaking directly from the sulfur hexafluoride (SF6) equipment within the medium-voltage gas chamber. The second gas detector 5 is installed in the space of the tower base platform 24 outside the medium-voltage switchgear 2 to monitor the diffusion of leaked gas on the tower base platform. The third gas detector 6 is installed in the space of the tower base platform 25 below the medium-voltage switchgear 2 to monitor the accumulation of leaked gas in the tower base area due to its density characteristics. All three detectors are connected to the gas analysis module via signal cables, transmitting the collected gas samples to the gas analysis module for analysis. All detectors are explosion-proof, with housings made of 304 stainless steel and a protection rating of at least IP65, suitable for the humid and dusty environment inside the tower.

[0021] Depending on the size of the tower, an appropriate number of detectors can be set up. After arranging an appropriate number of detectors along the height of the tower, monitoring points that are prone to leakage and accumulation can be set up to achieve comprehensive monitoring.

[0022] An axial flow fan is located at the bottom of tower door 23, using a corrosion-resistant motor. A removable and washable dust filter is installed at the air inlet to prevent dust blockage and maintain ventilation efficiency. A rigid air duct connects to the fan's outlet, bending downwards and outwards from the tower. Made of galvanized steel, it ensures smooth exhaust while preventing rainwater and debris from entering the tower. The axial flow fan is electrically connected to the gas analysis module and is equipped with a manual start button located on the outer wall of the tower door.

[0023] The gas analysis module 22 has a built-in data storage unit that can store at least 30 days of historical monitoring data for easy tracing of leaks. When a leak occurs in the sulfur hexafluoride (SF6) equipment within the medium-pressure cabinet, the first gas detector first collects a high concentration of SF6 gas and transmits the sample to the gas analysis module. If the leak is large, the gas diffuses to the bottom platform of the tower, where the second and third gas detectors detect changes in gas concentration. The gas analysis module analyzes the samples from the three detectors. When it detects a SF6 concentration ≥1000 μL / L or an oxygen concentration ≤19.5%, it immediately triggers the following actions: The axial flow fan is started to expel the leaked gas inside the tower to the outside and downward through the rigid air duct, thus accelerating air replacement. Control the alarm lights to flash, visually alerting personnel outside the tower to the risk of leakage inside the tower and preventing unauthorized personnel from entering; The excessive data and alarm signals are transmitted to the converter communication cabinet via network cable and 485 communication bus, and then forwarded to the wind turbine monitoring backend. The backend issues an audible and visual alarm to notify the operation and maintenance personnel to handle the situation.

[0024] like Figure 3 If maintenance personnel discover an automatic system malfunction upon arrival at the site, they can activate the ventilation fan via the manual start button outside the tower door to ensure timely discharge of leaked gas.

[0025] The electric control switch 14 located on the outside of the tower door 23 serves as a manual safety trigger button. Construction workers can walk up the stairs 29 to the tower door 23 and, based on the monitoring results and the prompts of the alarm light 13, manually turn on the axial flow fan 15 to complete the discharge of sulfur hexafluoride from the tower. The guardrail 26 located at the top of the stairs 29 ensures the safety of construction workers and avoids the risk of falling from height.

[0026] L1, L2, and L3 are power phase lines; FU is a fuse; QF is a circuit breaker; KM is a contactor; SB1 is a manual start button; SB2 is a stop button; FR is a thermal relay; A1 and A2 are contactor coil terminals; and A3 is an alarm light connection terminal.

[0027] The manual control loop can serve as a safety redundancy in case the automatic control loop fails, ensuring the safe operation of the tower. Construction personnel can manually control the operation of the axial flow fan 15, thereby reducing the gas concentration inside the tower.

[0028] In the preferred embodiment, a first medium-voltage cable cabinet 1 and a second medium-voltage cable cabinet 3 are respectively installed on both sides of the medium-voltage switchgear 2. A GIS complete switch 8 is installed inside the medium-voltage switchgear 2. The GIS complete switch 8 is connected to the medium-voltage switchgear 2 and the first medium-voltage cable cabinet 1 and the second medium-voltage cable cabinet 3 respectively.

[0029] The above-mentioned design reduces the overall space required, ensures the safe and stable operation of all components inside the tower, and also reduces the workload of daily maintenance.

[0030] In the preferred embodiment, a vacuum high-voltage contactor 7 is installed inside the second medium-voltage cable cabinet 3. The two sides of the vacuum high-voltage contactor 7 are connected to the high-voltage copper busbar 12, the generator 18, and the GIS switch 8, respectively. The first medium-voltage cable cabinet 1 is connected to the transformer substation 21 through the high-voltage copper busbar 12.

[0031] In the preferred embodiment, the gas analysis module 22 is connected to the alarm light 13, the electronic control switch 14 and the axial flow fan 15 via the power cord 9. The alarm light 13 and the electronic control switch 14 are respectively located on one side of the tower door 23. The first gas detector 4, the second gas detector 5 and the third gas detector 6 are respectively connected to the gas analysis module 22 via the suction pipe 11.

[0032] The alarm light 13 is fixedly installed on the outer wall of the tower door 23 and electrically connected to the gas analysis module 22. The alarm light uses an LED light source, featuring low power consumption and high brightness, with a flashing frequency of 1-2 times / second (1.5 times / second in this embodiment). The warning distance is no less than 50 meters, and it is designed to be silent to prevent noise interference in the complex environment of the wind farm from causing the warning signal to be ignored. An LED display screen can also be installed on one side of the alarm light 13 as needed, flashing while displaying alarm information to more clearly convey risk information and achieve an intuitive external warning function.

[0033] In the preferred embodiment, the gas analysis module 22 is connected to the converter cabinet 19 via communication line 10, and the converter cabinet 19 is connected to the central control room 20 via communication line 10.

[0034] Communication line 10 includes a network cable and a 485 communication bus. The gas analysis module 22 is connected to the converter communication cabinet via the network cable, and then transmits the gas analysis data to the fan monitoring backend via the converter communication cabinet. At the same time, the gas analysis module establishes communication with the converter via the 485 communication bus to ensure the stability and compatibility of data transmission.

[0035] like Figure 4-8 In a preferred embodiment, the bottom of the air duct 16 is detachably provided with an air cover 17, which includes a first straight tube 1701 and a first air inlet 1702.

[0036] By setting up the hood 17, the air intake effect can be further improved, ensuring that the sulfur hexafluoride gas is stably and rapidly drawn out and moved in the first air expansion port 1702, increasing the air capacity. Combined with the filter membrane ventilation set in the tower, it ensures the connection between the cabin and the outside air, ensuring the breathing and operation safety of personnel.

[0037] In a preferred embodiment, the lower side of the air duct 16 is provided with an external thread 1601, and the inner side of the first straight tube 1701 is provided with an internal thread 1705. The external thread 1601 and the internal thread 1705 have the same direction of rotation.

[0038] The ability to quickly install and dismantle towers allows for adaptation and replacement based on different tower sizes, improving overall flexibility.

[0039] In a preferred embodiment, a plurality of threaded holes 1706 are provided through the inner side of the first straight cylinder 1701, and screws 28 are inserted into the threaded holes 1706, with the ends of screws 28 abutting against the outer wall of the air duct 16.

[0040] In a preferred embodiment, the lower side of the first air vent 1702 is connected to a second air vent 1704 via a second straight cylinder 1703. The outer diameter of the second air vent 1704 is larger than that of the first air vent 1702. The first air vent 1702 and the second straight cylinder 1703 are connected to form a buffer space. Multiple partitions 1708 are provided circumferentially on the inner side of the first air vent 1702.

[0041] The second air inlet 1704 further increases the overall air intake volume. At the same time, the sulfur hexafluoride gas undergoes a buffer transition within the buffer space, avoiding a large impact on the air duct 16. In conjunction with the baffle 1708, the structural strength of the hood 17 is improved. Meanwhile, the baffle 1708 guides the airflow to ensure the extraction rate.

[0042] In the preferred embodiment, a filter screen 27 is detachably provided at the lower part of the first straight cylinder 1701, and a plurality of grooves 1707 are symmetrically provided on the upper side of the first air vent 1702. The filter screen 27 includes a fixing ring 2701, and two pressure strips 2702 are vertically arranged in the middle of the fixing ring 2701. The length of the pressure strips 2702 is greater than that of the fixing ring 2701, and the pressure strips 2702 and the grooves 1707 are inserted into each other.

[0043] By setting up the filter screen 27, larger foreign objects from the tower base platform 25 are prevented from directly entering the axial flow fan 15 through the air duct 16, thus avoiding damage to the axial flow fan 15, ensuring safe and stable use, reducing operating costs, and extending the maintenance cycle.

[0044] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A sulfur hexafluoride leakage prevention and control device inside a wind turbine tower, characterized in that: The gas analysis module (22) is installed on the upper part of the medium-voltage switchgear (2). The gas analysis module (22) is connected to a first gas detector (4), a second gas detector (5) and a third gas detector (6) from top to bottom. The first gas detector (4), the second gas detector (5) and the third gas detector (6) are respectively installed in the medium-voltage switchgear (2), the tower bottom platform (24) and the tower base platform (25). The gas analysis module (22) is also installed in the tower bottom platform (24). A duct (16) is installed on one side of the axial flow fan (15). The duct (16) faces the bottom of the tower base platform (25). The tower base platform (25) and the gas analysis module (22) are electrically connected.

2. The sulfur hexafluoride leakage prevention and control device inside the wind turbine tower according to claim 1, characterized in that: The medium-voltage switchgear (2) is equipped with a first medium-voltage cable cabinet (1) and a second medium-voltage cable cabinet (3) on both sides. The medium-voltage switchgear (2) is equipped with a GIS switchgear (8). The GIS switchgear (8) is connected to the medium-voltage switchgear (2) and the first medium-voltage cable cabinet (1) and the second medium-voltage cable cabinet (3) respectively.

3. The sulfur hexafluoride leakage prevention and control device inside the wind turbine tower according to claim 2, characterized in that: The second medium-voltage cable cabinet (3) is equipped with a vacuum high-voltage contactor (7). The two sides of the vacuum high-voltage contactor (7) are connected by a high-voltage copper busbar (12), a generator (18), and a GIS switch (8), respectively. The first medium-voltage cable cabinet (1) is connected to the transformer substation (21) by a high-voltage copper busbar (12).

4. The sulfur hexafluoride leakage prevention and control device inside the wind turbine tower according to claim 1, characterized in that: The gas analysis module (22) is connected to the alarm light (13), the electric control switch (14) and the axial flow fan (15) respectively via the power cord (9). The alarm light (13) and the electric control switch (14) are respectively located on one side of the tower door (23). The first gas detector (4), the second gas detector (5) and the third gas detector (6) are respectively connected to the gas analysis module (22) via the suction pipe (11).

5. The sulfur hexafluoride leakage prevention and control device inside the wind turbine tower according to claim 1, characterized in that: The gas analysis module (22) is connected to the converter cabinet (19) via a communication line (10), and the converter cabinet (19) is connected to the central control room (20) via a communication line (10).

6. The sulfur hexafluoride leakage prevention and control device inside the wind turbine tower according to claim 1, characterized in that: The bottom of the air duct (16) is detachably provided with an air hood (17), which includes a first straight tube (1701) and a first air inlet (1702).

7. The sulfur hexafluoride leakage prevention and control device inside the wind turbine tower according to claim 6, characterized in that: The air duct (16) has an external thread (1601) on its lower side and an internal thread (1705) on the inner side of the first straight tube (1701). The external thread (1601) and the internal thread (1705) have the same direction of rotation.

8. The sulfur hexafluoride leakage prevention and control device inside the wind turbine tower according to claim 7, characterized in that: The inner side of the first straight tube (1701) is provided with multiple threaded holes (1706), and the screw (28) is inserted into the threaded hole (1706), with the end of the screw (28) abutting against the outer wall of the air duct (16).

9. The sulfur hexafluoride leakage prevention device inside the wind turbine tower according to claim 6, characterized in that: The lower side of the first air inlet (1702) is connected to the second air inlet (1704) via the second straight cylinder (1703). The outer diameter of the second air inlet (1704) is larger than that of the first air inlet (1702). The first air inlet (1702) and the second straight cylinder (1703) are connected to form a buffer space. Multiple partitions (1708) are provided on the inner side of the first air inlet (1702) along the circumferential direction.

10. The sulfur hexafluoride leakage prevention and control device inside the wind turbine tower according to claim 9, characterized in that: The lower part of the first straight cylinder (1701) is detachably equipped with a filter screen (27). The upper side of the first air vent (1702) is symmetrically provided with multiple grooves (1707). The filter screen (27) includes a fixing ring (2701). Two pressure strips (2702) are vertically arranged in the middle of the fixing ring (2701). The length of the pressure strips (2702) is greater than that of the fixing ring (2701). The pressure strips (2702) and the grooves (1707) are inserted into each other.

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