10.5kv high voltage yaw slip ring for wind turbine generator system

Abstract

This invention discloses a 10.5kV high-voltage yaw slip ring for wind turbine generators. The slip ring includes a coaxially arranged rotor assembly and stator assembly, a frame, a sealing and protection assembly, a high-voltage insulation assembly, and a temperature control system assembly. The rotor assembly includes a central shaft, a rotor support, a high-voltage slip ring assembly, a low-voltage slip ring assembly, and a grounding slip ring. The high-voltage slip ring has a disc structure with its upper surface as the contact surface, while the low-voltage slip ring has a ring structure with its outer circular surface as the contact surface. The high-voltage and low-voltage slip rings respectively employ spring-loaded brushes and spring-pressed brushes. The high-voltage insulation assembly uses epoxy resin-cast insulating support columns and insulating partitions, with a breakdown voltage of not less than 35kV. The temperature control system monitors in real time using an infrared probe and automatically heats or dissipates heat. This invention achieves stable transmission of 10.5kV high voltage on the yaw slip ring for the first time, with reliable contact, intelligent temperature control, excellent sealing, and a service life of over 25 years, completely replacing traditional cable twisting systems.

Description

Technical Field

[0001] This invention belongs to the technical field of wind power transmission equipment, specifically relating to a 10.5kV high-voltage yaw collector ring for large-megawatt wind turbine generators. Background Technology

[0002] With the rapid development of wind power technology towards larger megawatts and higher voltages, the capacity of wind turbine units is constantly increasing, placing higher demands on power transmission systems under yaw conditions. Currently, power transmission under yaw conditions for wind turbine units mainly uses twisted cable systems or conventional slip rings. Among them, the twisted cable system suffers from problems such as complex structure, high design difficulty, cable slippage, wear, and overheating. Moreover, as the unit capacity increases, the number of cables easily exceeds the design limit, becoming a bottleneck restricting the development of large-megawatt wind turbine units. Conventional slip rings are mostly suitable for low-voltage scenarios, with voltage levels generally not exceeding 1500V, and cannot meet the requirements of 10.5kV high-voltage transmission. Therefore, developing a yaw slip ring that can adapt to 10.5kV high-voltage transmission, has stable contact, excellent heat dissipation, is resistant to harsh environments, and has a long service life has become an urgent technical problem to be solved. Summary of the Invention

[0003] This invention aims to solve the technical problems of existing yaw collector rings being unable to adapt to 10.5kV high-voltage transmission and the numerous hidden dangers of cable twisting systems, and provides a collector ring device that can achieve safe, efficient, and long-term stable transmission of 10.5kV high-voltage power under yaw conditions of large-megawatt wind turbines.

[0004] Technical solution To achieve the above objectives, the present invention provides a 10.5kV high-voltage yaw collector ring for wind turbine generator sets, comprising a rotor assembly and a stator assembly coaxially arranged, a frame, a sealing and protection assembly, a high-voltage insulation assembly, and a temperature control system assembly; the rotor assembly is rotatably disposed within the stator assembly, and the high-voltage insulation assembly is disposed between the rotor assembly and the stator assembly and at the connection points of each component.

[0005] Furthermore, the rotor assembly includes a central rotating shaft, a rotor support, a high-voltage slip ring group, a low-voltage slip ring group, and a grounding slip ring; the central rotating shaft is rotatably connected to the base via bearings, and the rotor support is fixedly sleeved on the central rotating shaft; the high-voltage slip ring group is fixedly fixed to the upper part of the rotor support along the axial direction of the central rotating shaft, including at least three independent slip rings, each slip ring corresponding to a 10.5kV high-voltage circuit; the low-voltage slip ring group is fixedly fixed to the bottom of the rotor support along the axial direction of the central rotating shaft, including at least three independent slip rings, each slip ring corresponding to a low-voltage circuit; the grounding slip ring is arranged between the high-voltage slip ring group and the low-voltage slip ring group; the low-voltage slip ring group has a circular ring structure, with inclined grooves evenly arranged on the outer circular surface of the slip ring and plated with a silver layer; the high-voltage slip ring has a disc structure, with inclined grooves evenly arranged on the upper surface of the slip ring and plated with a silver layer.

[0006] Furthermore, the stator assembly includes a stator support, a brush group, and a busbar; the brush group is mounted on the stator support and corresponds to and abuts against the low-voltage slip ring group, the grounding slip ring, and the high-voltage slip ring group; the brushes of the low-voltage slip ring group and the grounding slip ring have a brush body and a braid structure, which are pressed together by a spring; the brushes of the high-voltage slip ring group are spring brushes, including a brush body and a tail spring, which are pressed together by the spring force of the spring itself.

[0007] Furthermore, the high-voltage insulation assembly includes a high-voltage insulation support column, a low-voltage insulation support tube, an insulation partition, and an insulation sleeve; the high-voltage insulation support column is located between the high-voltage stator support and the high-voltage slip ring assembly, the low-voltage insulation support tube is located between the low-voltage stator support and the low-voltage slip ring assembly, and the insulation partition is located between the low-voltage slip ring assembly and the high-voltage slip ring assembly; the insulation support column and support tube are formed by epoxy resin casting, achieving an insulation class of F and a breakdown voltage of not less than 35kV.

[0008] Furthermore, the temperature control system components include a heater, a cooling fan, a filter window, an infrared temperature monitoring probe, a temperature alarm, and a temperature controller; the infrared temperature monitoring probe is arranged on the side of the high-pressure slip ring assembly and the low-pressure slip ring assembly and is connected to the temperature controller; when the detected temperature rises to the set value, the temperature controller controls the cooling fan to start; when the detected temperature is too high, the temperature controller sends a signal to the temperature alarm and sends an alarm to the unit's main control unit.

[0009] Furthermore, the sealing and protection assembly includes a rotor terminal box, a sealing gasket, a stator terminal box, and a side plate assembly; the sealing gasket is located at the connection between the rotor assembly and the stator frame and adopts a labyrinth channel design to achieve sealing and protection, preventing rainwater and dust from entering the inside of the slip ring.

[0010] Compared with the prior art, the beneficial effects of the present invention are: 1. Achieving high-voltage transmission: This invention, through a specially designed high-voltage slip ring assembly (disc structure, upper surface contact) and high-voltage insulation components (epoxy resin casting, Class F insulation, ≥35kV breakdown voltage), has for the first time achieved stable and safe transmission of 10.5kV high voltage on the yaw collector ring, filling a technological gap and completely replacing the traditional twisted cable system.

[0011] 2. Stable and reliable contact: This invention adopts a differentiated brush design for high and low voltage characteristics: the low voltage side uses a spring-pressed carbon brush, and the high voltage side uses a spring-loaded brush, ensuring that the brush and slip ring are always in stable contact under yaw rotation and vibration conditions, effectively avoiding sparking caused by contact gaps.

[0012] 3. Intelligent and efficient temperature control: This invention integrates an active temperature control system, which automatically starts heating or cooling through infrared non-contact real-time monitoring, strictly controlling the working temperature between 10℃ and 85℃, effectively preventing insulation aging and component damage caused by excessive cold or heat, and significantly extending service life.

[0013] 4. Strong environmental adaptability: Through the design of labyrinth sealing and protective box (with louvers), this invention achieves excellent sealing and protection performance, which can effectively isolate harsh environmental factors such as rain and dust, and ensure long-term stability of internal electrical insulation and contact performance.

[0014] 5. Significant economic benefits: The invention has been verified by prototypes and has a service life of more than 25 years. It reduces equipment costs and maintenance difficulties, and has significant practicality and economic benefits. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the stator assembly structure of the present invention; Figure 3 This is a schematic diagram of the rotor assembly structure of the present invention; Figure 4 This is a schematic diagram of the high-voltage brush assembly and spring brush structure of the present invention; Figure 5 This is a schematic diagram of the temperature measurement and temperature control system of the present invention.

[0016] In the diagram: 1-Temperature controller; 2-Temperature alarm; 3-Cooling fan; 4-Rotor terminal box; 5-Stator terminal box; 6-Stop arm; 7-Grounded rotor side connection point; 8-Protective components; 101-Low-voltage stator terminal block; 102-Low-voltage stator assembly; 103-Grounded stator terminal block; 104-High-voltage stator terminal block; 105-Insulating partition; 106-High-voltage stator assembly; 108-Stator frame assembly; 109-High-voltage rotor connection point; 110-Low-voltage rotor connection point; 111-Grounded rotor connection point; 112-Heater; 113-Central shaft; 114-Grounded stator assembly; 15-High voltage insulation assembly; 116-Insulation support tube; 117-Rotor flange; 118-Rotor bracket; 201-Low voltage rotor assembly; 202-High voltage rotor assembly; 203-Insulation support column; 204-Insulation partition; 205-Insulation square tube; 206-Insulation sleeve; 207-Base bearing; 208-Base plate; 209-Tie rod; 210-Grounded rotor assembly; 301-High voltage brush mounting plate; 302-Spring brush; 303-Spring brush body; 304-Spring brush spring; 401-Infrared temperature control system assembly; 402-Infrared temperature probe; 403-Side plate assembly. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 like Figures 1 to 5 As shown, the present invention provides a 10.5kV high-voltage yaw collector ring for wind turbine generator sets, including a stator frame assembly 108, a low-voltage rotor assembly 201, a high-voltage rotor assembly 202, a low-voltage stator assembly 102, a high-voltage stator assembly 106, a high-voltage insulation assembly 115, an infrared temperature control system assembly 401, and a sealing and protection assembly.

[0019] I. Stator Frame Components The stator frame assembly 108 constitutes the fixed support skeleton of the entire slip ring, including the base plate 208, the tie rod 209, and the bearing assembly 207.

[0020] Base plate 208: Made of high-strength alloy steel (e.g., 40Cr or Q355B), integrally cast or welded, with multiple bolt holes (e.g., 8 through holes with a diameter of 18mm) evenly spaced around its perimeter. These holes are used to secure the base plate to the top flange of the wind turbine yaw platform using high-strength bolts (grade 10.9), maintaining relative stillness with the tower. The surface of base plate 208 is hot-dip galvanized, with a corrosion resistance level of not less than C5-M.

[0021] Tie rods 209: Four rods are provided, made of high-strength alloy steel (such as 42CrMo) round steel. Their lower ends are fixed to the base plate 208 by threaded connection or welding. They extend vertically upwards along the base plate 208 and are evenly spaced at 90° intervals around the axis of the central pivot 113. The upper ends of the four tie rods 209 are connected into a single unit by an upper fixing plate (not shown in the figure), forming a stable cage-like frame. Insulating sleeves 206 (details described later) are fitted around the outside of the tie rods 209 to ensure insulation to ground.

[0022] Bearing assembly 207: Fixedly installed at the center of the base plate 208, extending upwards in the same direction as the tie rod 209. Bearing assembly 207 includes a bearing housing, an end cover, and a sealing ring. A deep groove ball bearing is installed in the bearing housing to bear radial loads and a certain axial load, realizing the rotational connection of the central shaft 113. At the same time, six auxiliary positioning small deep groove ball bearings are also provided at the upper end of the central shaft 113 (near the rotor flange 117). These bearings are evenly arranged circumferentially in an auxiliary bearing housing and roll in contact with the upper journal of the central shaft 113 to further improve the rotational stability of the low-pressure rotor assembly 201, the grounding rotor assembly 210, and the high-pressure rotor assembly 202, effectively resisting the mechanical vibration and impact caused by blade rotation and yaw during the operation of the wind turbine.

[0023] II. Rotor Assembly The central rotating shaft 113, low-voltage rotor assembly 201, grounded rotor assembly 210, high-voltage rotor assembly 202, rotor flange 117, rotor support 118 and stop arm 6 together constitute the rotating part (rotor structure) of the yaw collector ring.

[0024] The central rotating shaft 113 is made of aluminum alloy, which is lightweight, high-strength, and has good electrical conductivity. The central rotating shaft 113 has a stepped shaft structure, with its lower end rotatably connected to the bearing bore of the bearing assembly 207 via a deep groove ball bearing. Multiple shoulders are provided in the middle and upper parts for positioning the rotor support 118 and each slip ring assembly. The upper end of the central rotating shaft 113 extends to the outside of the rotor junction box 4 and is fixed to the rotor flange 117 via a key connection.

[0025] Rotor flange 117: Made of 45# steel with heat treatment, it is fixedly connected to the connecting pipe (not shown in the figure) at the upper end of the central rotating shaft 113 by bolts, so that the rotor flange 117 and the slip ring assembly can rotate synchronously.

[0026] The stop arm 6 is made of stainless steel (such as 304) by casting or welding. Its root is fixed to the upper edge of the rotor flange 117 by bolts. The end of the stop arm 6 is provided with a U-shaped groove or pin hole for connecting to the shift fork rod of the wind turbine nacelle base. When the nacelle yaws, the shift fork rod drives the stop arm 6, thereby driving the entire rotor assembly to yaw and rotate synchronously with the nacelle, ensuring the continuity of power transmission during yaw. The maximum yaw angle can reach ±720°.

[0027] Rotor bracket 118: It adopts an aluminum alloy cylindrical structure and is fixedly sleeved in the middle of the central rotating shaft 113. It is positioned by a key and a shaft shoulder and is fixed with a lock nut. The outer circumference of the rotor bracket 118 has three mounting steps arranged axially from top to bottom, which are used to fix the high-voltage rotor assembly 202, the grounding rotor assembly 210 and the low-voltage rotor assembly 201, respectively.

[0028] High-voltage rotor assembly 202: includes 3 sets of independent slip rings, each set corresponding to one 10.5kV high-voltage circuit (U, V, W phases). The slip rings are made of brass and have a disc-shaped structure. The upper surface of the slip ring (the working surface in contact with the brush) is uniformly arranged with spiral grooves, and the grooves and the entire working surface are plated with a silver layer with a thickness ≥5μm to reduce contact resistance and improve wear resistance and oxidation resistance.

[0029] Low-voltage rotor assembly 201: includes 3 sets of independent slip rings, each set corresponding to one low-voltage circuit (typically 690V or 400V). The slip rings are made of brass alloy (such as HSi80-3) and have a circular ring structure. The outer circular surface of the slip ring (the working surface in contact with the brush) is uniformly decorated with axial grooves (similar to knurling or mesh pattern) and plated with a silver layer (thickness ≥3μm).

[0030] Grounding rotor assembly 210: includes a set of independent slip rings, which are made of the same material and structure as the low-voltage slip ring set, and are arranged between the high-voltage slip ring set and the low-voltage slip ring set, for connecting the generator neutral point grounding and the cable shielding layer grounding.

[0031] III. Stator Assembly The low-voltage stator assembly 102, the grounding stator assembly 114, the high-voltage stator assembly 106, the low-voltage stator terminal block 101, the grounding stator terminal block 103, and the high-voltage stator terminal block 104 together constitute the fixed part (stator structure) of the yaw collector ring.

[0032] Installation method: The low-voltage stator assembly 102, the grounded stator assembly 114 and the high-voltage stator assembly 106 are respectively fixed to the tie rod 209 of the frame assembly 108 through the insulating support tube 116 or the insulating support column 203, and are respectively set opposite to the corresponding low-voltage rotor assembly 201, the grounded rotor assembly 210 and the high-voltage rotor assembly 202 to maintain concentricity.

[0033] High-voltage stator assembly 106: Each set of high-voltage slip rings corresponds to 4 brushes. The 4 brushes are evenly spaced at 90° intervals along the circumference of the upper surface of the slip ring to ensure uniform contact pressure. The high-voltage brushes are high-copper spring brushes (copper content ≥85%), and their structure is as follows... Figure 4 As shown, it consists of two parts: the brush body 303 and the tail spring 304. The brush body 303 is a cuboid, and the tail spring 304 is made of beryllium bronze or stainless steel. The brush presses the brush body 303 tightly against the upper surface of the high-voltage slip ring through the spring's own elasticity (initial elasticity of approximately 5N to 8N). The tail of the spring is connected to the high-voltage brush mounting plate 301 by bolts, and the mounting plate 301 is fixed to the stator bracket. This spring structure has an elasticity attenuation of ≤15% during its service life (design life ≥25 years), ensuring stable contact between the brush and the slip ring during yaw rotation and preventing contact gaps that could lead to sparking.

[0034] Low-voltage stator assembly 102 and grounding stator assembly 114: Each low-voltage slip ring corresponds to 6 brushes, symmetrically arranged at 60° intervals along the circumference of the slip ring's outer surface; the grounding slip ring corresponds to 2 brushes, symmetrically arranged on both sides. The low-voltage brushes and grounding brushes adopt the same structure: including a brush body and brush braids. The brush body is made of high-copper graphite or silver graphite, and the brush braids are made of multi-strand copper wire. The brush body is pressed against the side surface of the slip ring by a constant-pressure spring.

[0035] Busbars: The high-voltage stator busbar 104 is made of aluminum alloy with a silver-plated surface. It is fixed to one side of the stator frame assembly 108 and connected to the high-voltage stator assembly 106 via adapter copper busbar bolts. One end of the high-voltage stator busbar 104 extends into the stator junction box 5 for connection to the high-voltage cable (10.5kV torsion-resistant copper cable) on the tower side. The grounding stator busbar 103 is on the same side as the high-voltage stator busbar 104, made of the same material, and is used to connect to the grounding cable on the tower side. The low-voltage stator busbar 101 is fixed to the other side of the stator frame assembly 108 and is made of copper or aluminum alloy. It is used to connect to the low-voltage cable on the tower side.

[0036] IV. High-voltage insulation components The high-voltage insulation assembly includes an insulation support column 203, an insulation support tube 116, an insulation partition 204, an insulation square tube 205, and an insulation sleeve 206.

[0037] Insulating support columns 203: These are installed between each passage of the high-voltage stator assembly 106 and the high-voltage rotor assembly 202 (i.e., between each phase of the high-voltage circuit and between the high voltage and ground), with a total of no fewer than eight columns. They are made by epoxy resin casting, and may be internally filled with glass fiber reinforcement. The insulation class reaches F (temperature resistance 155℃), and the shape is cylindrical. Testing shows that their breakdown voltage is not less than 35kV (power frequency, dry state), and the leakage current is ≤1mA.

[0038] Insulating support tube 116: It is set between each passage of the low-voltage stator assembly 102 and the low-voltage rotor assembly 201, and is also made of epoxy resin casting, with a breakdown voltage of not less than 5kV.

[0039] Insulating partition 204: This partition is installed between the high-voltage slip ring assembly 202 and the low-voltage slip ring assembly 201, and between the rotor junction box 4 and the yaw collector ring. It is made of 3240 epoxy board (epoxy glass cloth laminate). This partition effectively isolates adjacent high-voltage and low-voltage components, preventing high-voltage breakdown from causing short circuits.

[0040] Insulating square tube 205: Sleeve on the outside of the low-voltage rotor wiring busbar, made of polyvinyl chloride (PVC) or epoxy resin.

[0041] Insulating sleeve 206: Sleeve over the outside of each tie rod 209, made of silicone rubber or epoxy resin, with a withstand voltage rating of ≥10kV, to prevent creepage between the tie rod and live parts.

[0042] High-voltage rotor side wiring: High-voltage rotor connection point 109 (3 sets in total) uses 10.5kV rated voltage torsion-resistant copper cable, cable specification is 25mm. 2 Or 35mm 2 The insulation layer is made of ethylene propylene rubber (EPR), which can withstand ±720° of torsion and is suitable for 10.5kV high-voltage transmission requirements.

[0043] V. Temperature Control System Components The temperature control system components include a heater 112, a cooling fan 3, a filter window, an infrared temperature monitoring probe 402, a temperature alarm 2, and a temperature controller 1.

[0044] Heaters 112: One heater is arranged in the space where the low-pressure slip ring group and the high-pressure slip ring group are located, respectively. They are PTC ceramic heaters with a power of 100W to 200W, a surface temperature of ≤150℃, and self-limiting temperature characteristics. When the ambient temperature is lower than 5℃, the temperature controller 1 automatically starts the heaters 112 to prevent the internal temperature of the slip ring from becoming too low, which would cause the lubricating oil to become viscous and the insulating material to become brittle.

[0045] Cooling fans 3: Two in total, fixed to the stator frame 108, located to the side of the low-voltage slip ring assembly and brushes. The fans are axial flow type, with an airflow ≥50 CFM and a voltage of 24V DC. A filter window is located opposite the cooling fans 3, fixed to the stator frame 108. The filter window contains replaceable non-woven filter cotton with a filtration accuracy ≤10μm. The fans and filter windows form an inlet-outlet circulation channel, forcing air convection and promptly dissipating the heat generated during the operation of the yaw slip ring.

[0046] Infrared temperature monitoring probe 402: A total of 6 probes are arranged, with 3 aligned with the upper surfaces of the 3 slip rings in the high-pressure slip ring group, and the other 3 aligned with the outer circular surfaces of the 3 slip rings in the low-pressure slip ring group. The probes are non-contact infrared thermopile sensors, with a temperature measurement range of -20℃ to 150℃, an accuracy of ±1℃, and a response time ≤0.5s. All probes are connected to the temperature controller 1 via shielded cables.

[0047] Temperature controller 1: Employs a PLC or dedicated microcontroller with a built-in PID algorithm. For example, the control logic is as follows: When any probe detects a temperature ≥60℃, controller 1 starts cooling fan 3; When the temperature drops to ≤45℃, turn off cooling fan 3; When the ambient temperature is ≤5℃, start heater 112; When the temperature rises to ≥15℃, turn off heater 112; When any probe detects a temperature ≥85℃ (for 10 seconds), controller 1 immediately sends a wireless signal (or hardwired signal) to temperature alarm 2. After receiving the signal, temperature alarm 2 sends an alarm signal (dry contact or Modbus) to the unit's main control unit, informing the staff that the yaw collector ring needs to be stopped for inspection.

[0048] Temperature control range: Through the above controls, the internal operating temperature of the slip ring is ensured to be consistently maintained between 10℃ and 85℃, preventing insulation aging and component damage due to excessive cooling or heating. Verification has shown that the internal temperature can be maintained within this range under ambient temperatures ranging from -30℃ to 50℃.

[0049] VI. Sealing and Protection Components The sealing and protection components include rotor terminal box 4, sealing gasket, stator terminal box 5, side plate assembly 403, etc.

[0050] Rotor junction box 4: Located on the outside of the terminals on the rotor busbar, it is made of carbon steel (Q235) with a thickness of 2mm and electrostatic powder coating (RAL7035) with an IP54 protection rating. Multiple louvers (opening downwards) are provided on the sides and top of the box to prevent rainwater from entering directly and to meet heat dissipation requirements. A rotary seal (skeleton oil seal) is provided between the box and the central rotating shaft 113.

[0051] Stator junction box 5: Fixed on frame 108, located on the outside of stator busbar, with the same material and protection level as rotor junction box 4, and also equipped with louvers.

[0052] Side plate assembly 403: Made of 1.5mm galvanized steel sheet bent into shape, with flame-retardant sponge attached to the inner surface, so that the inside of the yaw collector ring forms an independent closed space.

[0053] Sealing gaskets: Located at the connection between the rotor assembly and the stator frame 108 (e.g., where the central shaft 113 protrudes from the frame), these gaskets employ a labyrinth design, formed by multiple nested annular protrusions and grooves, with grease filling the labyrinth. This design effectively prevents rainwater, salt spray, and dust from entering the slip rings, avoiding dust ingress that could affect component contact and insulation performance, achieving an IP54 protection rating.

[0054] Operation process: During normal wind turbine operation, the nacelle automatically yaws according to the wind direction. This yaw causes the shift fork to rotate, which, via the stop arm 6, drives the central shaft 113 and its fixed low-voltage rotor assembly 201, high-voltage rotor assembly 202, and grounding rotor assembly 210 to rotate synchronously. At this time, the rotating slip rings maintain stable contact with the fixed brush assembly (disc sliding contact for high voltage and circumferential sliding contact for low voltage). The 10.5kV high-voltage power generated by the generator is transmitted through the high-voltage rotor connection point 109 to the high-voltage slip ring, then through the spring brush 302 to the high-voltage stator assembly 106, and finally output to the tower-side converter for voltage boosting and grid connection via the high-voltage stator terminal block 104. The low-voltage power is generated similarly. The grounding path maintains an equipotential connection between the nacelle and the tower ground at all times.

[0055] Throughout operation, the infrared temperature control system component 401 monitors the temperature of each slip ring in real time and automatically starts or stops the cooling fan 3 or heater 112 based on the temperature, ensuring that the slip rings remain within the optimal operating temperature range. The sealed protection component effectively isolates external rainwater, salt spray, and dust, while the insulation component ensures the absolute safety of the 10.5kV high voltage.

[0056] VII. Verification Results Prototype verification shows that the 10.5kV high-voltage yaw slip ring of this invention can effectively achieve stable transmission of 10.5kV high-voltage and low-voltage power, with low contact resistance, no arcing, reasonable operating temperature control, strong resistance to harsh environments, and a service life of over 25 years. It completely replaces the cable twisting system, solving problems such as cable slippage, wear, and overheating in the traditional cable twisting system. At the same time, it solves the defect of conventional slip rings being unable to adapt to high-voltage transmission, adapts to the yaw condition requirements of large-megawatt wind turbines, reduces equipment costs and maintenance difficulty, and has significant practicality and economic benefits.

[0057] The embodiments described herein are all optional embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent changes made based on the structure and principles of the present invention without departing from the design concept of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A 10.5kV high-voltage yaw slip ring for wind turbine generator sets, comprising a coaxially arranged rotor assembly and stator assembly, a frame, and a sealing and protective assembly, characterized in that, It also includes high-voltage insulation components and temperature control system components; The rotor assembly is rotatably disposed within the stator assembly, and the high-voltage insulation assembly is disposed between the rotor assembly and the stator assembly and at the connection points of each component; The rotor assembly includes a central shaft, a rotor support, a high-voltage slip ring group, a low-voltage slip ring group, and a grounding slip ring. The high-voltage slip ring group is fixedly mounted on the upper part of the rotor support along the axial direction of the central shaft, and includes at least three independent slip ring groups, each corresponding to a 10.5kV high-voltage circuit. The low-voltage slip ring group is fixedly mounted on the bottom of the rotor support along the axial direction of the central shaft, and includes at least three independent slip ring groups, each corresponding to a low-voltage circuit. The grounding slip ring is arranged between the high-voltage slip ring group and the low-voltage slip ring group. The high-voltage slip ring has a disc structure, and its contact surface with the stator assembly brush is the upper surface; the low-voltage slip ring has a ring structure, and its contact surface with the stator assembly brush is the outer circular surface.

2. The 10.5kV high-voltage yaw collector ring according to claim 1, characterized in that, The outer surface of the low-voltage slip ring assembly has uniformly arranged inclined grooves and is plated with a silver layer; the upper surface of the high-voltage slip ring assembly has uniformly arranged inclined grooves and is plated with a silver layer; the low-voltage slip ring assembly and the grounding slip ring are made of brass alloy, and the high-voltage slip ring assembly is made of brass.

3. The 10.5kV high-voltage yaw collector ring according to claim 1, characterized in that, The stator assembly includes a stator support, a brush assembly, and a busbar. The brush assembly is mounted on the stator support and abuts against the low-voltage slip ring assembly, the grounding slip ring and the high-voltage slip ring assembly one by one; The brushes of the low-voltage slip ring assembly and the grounding slip ring include brush bodies and brush braids, and the brush bodies are pressed against the side surfaces of the low-voltage slip ring and the grounding slip ring by springs; The brush of the high-voltage slip ring assembly is a spring-loaded brush, which includes a brush body and a tail spring. The brush body is pressed against the upper surface of the high-voltage slip ring by the elastic force of the spring itself.

4. The 10.5kV high-voltage yaw collector ring according to claim 1, characterized in that, The high-voltage insulation assembly includes a high-voltage insulation support column, a low-voltage insulation support tube, an insulation partition, and an insulation sleeve. The high-voltage insulating support column is located between the high-voltage stator support and the high-voltage slip ring assembly, and the low-voltage insulating support tube is located between the low-voltage stator support and the low-voltage slip ring assembly. The insulating partition is located between the low-voltage slip ring group and the high-voltage slip ring group to achieve high-voltage isolation; The high-voltage insulating support column and the low-voltage insulating support pipe are made of epoxy resin casting, and their insulation class reaches F, with a breakdown voltage of not less than 35kV.

5. The 10.5kV high-voltage yaw collector ring according to claim 1, characterized in that, The temperature control system components include a heater, a cooling fan, a filter window, an infrared temperature monitoring probe, a temperature alarm, and a temperature controller. One heater is arranged in the space where the low-pressure slip ring group and the high-pressure slip ring group are located, respectively; The cooling fan is fixed on the stator frame and located to the side of the low-voltage slip ring assembly and brushes. The filter window is located on the opposite side of the cooling fan and fixed on the stator frame. The infrared temperature monitoring probes are respectively arranged on the sides of the high-pressure slip ring group and the low-pressure slip ring group, and are connected to the temperature controller; The temperature controller is configured to: control the cooling fan to start when the infrared temperature monitoring probe detects that the temperature has risen to a set value; and send a signal to the temperature alarm when the temperature exceeds the threshold, so that the temperature alarm can send an alarm signal to the unit's main control unit.

6. The 10.5kV high-voltage yaw collector ring according to claim 1, characterized in that, The sealing and protection assembly includes a rotor terminal box, a sealing gasket, a stator terminal box, and a side plate assembly; The rotor terminal box is covered on the outside of the terminals on the rotor busbar, and the stator terminal box is fixed on the frame and located on the outside of the stator busbar. Both the rotor terminal box and the stator terminal box are equipped with multiple louvers. The sealing gasket is located at the connection between the rotor assembly and the stator frame and adopts a labyrinth channel design.

7. The 10.5kV high-voltage yaw collector ring according to claim 1, characterized in that, The rotor assembly also includes a stop arm, which is fixed to the edge of the upper surface of the rotor flange and is used to connect with the shift fork rod of the wind turbine nacelle base to drive the rotor assembly to yaw synchronously with the nacelle.

8. The 10.5kV high-voltage yaw collector ring according to claim 1, characterized in that, The stator assembly further includes a stator frame assembly, which includes a base plate, tie rods, and bearing assemblies. The base plate is used for fixed installation on the yaw platform of the wind turbine; The tie rod is mounted on the base plate and extends upward along the base plate, with multiple rods evenly spaced around the central axis. The bearing assembly contains a deep groove ball bearing for rotating the central shaft.

9. The 10.5kV high-voltage yaw collector ring according to claim 1, characterized in that, Each group of high-voltage slip rings corresponds to 4 brushes, each group of low-voltage slip rings corresponds to 6 brushes, and each grounding slip ring corresponds to 2 brushes.

10. The 10.5kV high-voltage yaw slip ring according to any one of claims 1 to 9, characterized in that, The temperature control system components are configured to maintain the internal operating temperature of the yaw collector ring between 10°C and 85°C.

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