A high-voltage fully shielded wind power tube busbar equipment for large-capacity wind turbines

Abstract

A high-voltage fully shielded wind power tube busbar device for large-capacity wind turbines relates to the field of wind power generation and power transmission. It is mainly designed to solve the problem that the existing wind power tube busbar equipment adopts ordinary low-voltage insulation and cannot meet the high-voltage power transmission requirements of large-capacity wind turbines. It includes a wind power tube busbar and a shielding cylinder; the wind power tube busbar and the shielding cylinder are all capacitive insulation. The wind power tube busbar includes a first wind power tube busbar and a second wind power tube busbar, and the shielding cylinder includes a first terminal shielding cylinder, a second terminal shielding cylinder, and an intermediate shielding cylinder; the connection insulation between the first wind power tube busbar and the second wind power tube busbar is realized through the intermediate shielding cylinder, and the insulation of the upper end of the first wind power tube busbar and the cable is realized through the first terminal shielding cylinder; the insulation of the lower end of the second wind power tube busbar and the cable and the bearing structure is realized through the second terminal shielding cylinder. The advantage is that reliable insulation of the wiring at both ends of the busbar and the middle joint is achieved, and the safety and reliability are high.

Description

Technical field:

[0002] The invention relates to the field of wind power generation and electric energy transmission, and in particular to a high-voltage fully shielded wind power tube busbar device suitable for large-capacity wind turbines. Background technology:

[0004] In the field of wind power, wind power tube busbar equipment has been partially used for power transmission inside the tower. However, since the insulation of the tube busbar itself, the connection insulation between the tube busbars, and the connection insulation between the tube busbars and the cables are all ordinary low-voltage insulation methods, when the voltage is higher than 3kV, the induced voltage on the busbar surface is much higher than the human safety voltage, which poses a great safety hazard and can no longer meet the requirements of high-voltage power transmission of large-capacity wind turbines. At present, land-based wind power has been developed in the direction of sea-based wind power on a large scale. The capacity of wind turbines is getting larger and larger, and the voltage level of power transmission is getting higher and higher. The common mode voltage on the converter side has reached 5kV, and new high-voltage fully shielded wind power tube busbar equipment is needed to meet this need. Summary of the invention:

[0006] The technical problem to be solved by the present invention is to provide a high-voltage fully shielded wind power tube busbar device for a large-capacity wind turbine which can improve the reliability of power transmission in a tower.

[0007] The object of the present invention is achieved in this way: it comprises a plurality of wind power tube busbars and shielding tubes; the wind power tube busbars and shielding tubes are all capacitive insulation.

[0008] The plurality of wind power tube busbars include a plurality of first wind power tube busbars and a plurality of second wind power tube busbars of the same structure, and the shielding cylinder includes a first terminal shielding cylinder, a second terminal shielding cylinder, and an intermediate shielding cylinder of the same structure; and also includes a limiting structure and a bearing structure;

[0009] The corresponding connection insulation between the first wind turbine busbar and the second wind turbine busbar is realized through the intermediate shielding tube, and the insulation between the upper end of the first wind turbine busbar and the cable is realized through the first terminal shielding tube; the insulation between the lower end of the second wind turbine busbar and the cable and the bearing structure is realized through the second terminal shielding tube; the limiting structure is arranged at a certain interval in the radial direction of the wind turbine busbar to realize the radial support and axial sliding function of the busbar.

[0010] The first wind power tube busbar and the second wind power tube busbar include a current carrier, a capacitor screen is arranged outside the current carrier, a sheath is arranged outside the capacitor screen, the capacitor screens are preferably shortened in an arithmetic progression from the inside to the outside, insulating materials are filled between the capacitor screens, the outermost capacitor screen is provided with a grounding wire connected to the ground, and the grounding wire extends from the sheath; the outer surface of the wind power tube busbar is at ground potential, the two ends of the sheath are bonded to the current carrier by adhesive, and both ends of the current carrier extend from the sheath. Connecting terminals can be provided at the two ends of the current carrier extending from the sheath as needed. The first wind power tube busbar is preferably provided with connecting terminals at the top end for connecting cables and fixing the first terminal shielding tube; the second wind power tube busbar is preferably provided with connecting terminals at the bottom end for connecting cables and the bearing structure and fixing the second terminal shielding tube.

[0011] The shielding tube includes a support tube, plugs are provided at both ends of the support tube, at least one plug is provided with a grounding lead, an equipotential tube is installed in the support tube, a capacitor screen is provided outside the support tube, the innermost capacitor screen is connected to the equipotential tube, the outermost capacitor screen is connected to the plug at the same potential, insulating materials are filled between the capacitor screens, and the capacitor screens are preferably lengthened from the inside to the outside according to an arithmetic progression. A sheath is provided outside the capacitor screen, and both ends of the sheath are bonded to the plug with an adhesive. The outer surface of the terminal shielding tube is at ground potential.

[0012] The upper end of the first wind turbine busbar extends into the lower part of the first terminal shielding tube, and is fixed to the equipotential tube in the first terminal shielding tube through the connecting terminal at the top of the first wind turbine busbar, thereby realizing the high-voltage potential connection between the innermost capacitor screen of the first terminal shielding tube and the first wind turbine busbar; the cable extends into the upper part of the first terminal shielding tube and is connected to the connecting terminal at the top of the first wind turbine busbar, and the grounding lead of the first terminal shielding tube is grounded to the tower wall, thereby realizing the ground potential of the outer surface of the shielding tube.

[0013] The lower end of the second wind turbine busbar extends into the upper part of the second terminal shielding tube, and is fixed to the equipotential tube in the second terminal shielding tube through the connecting terminal at the bottom end of the second wind turbine busbar, thereby realizing the connection between the innermost capacitor screen of the second terminal shielding tube and the high-voltage potential of the second wind turbine busbar; the cable extends into the lower part of the second terminal shielding tube and is connected to the connecting terminal at the lower end of the second wind turbine busbar, and the second terminal shielding tube sealed grounding lead is grounded to the tower wall, thereby realizing the ground potential of the outer surface of the shielding tube.

[0014] The current carrier of the first wind power tube busbar and the current carrier of the second wind power tube busbar can be connected by mechanical connection or welding. The present invention is preferably welded, and an equipotential ring is set at the welding position. The equipotential tube in the middle shielding tube is fixed to the equipotential ring welded on the current carrier, thereby realizing the high-voltage potential connection between the innermost capacitor screen of the middle shielding tube and the wind power tube busbar; after the middle shielding tube blocks the grounding lead and is grounded to the tower wall, the outer surface of the shielding tube realizes the ground potential.

[0015] The bearing structure includes support rods, shock absorbers, and support round steels. The number of support rods, shock absorbers, and support round steels is the same. The number of support rods is the same as the number of terminal shielding tubes. The upper end of each support rod is respectively inserted into the axial hole of the connecting terminal at the bottom end of the second wind power busbar, and the lower end of each support rod is respectively inserted into the axial hole at the top of the shock absorber. The support round steel is welded to the tower wall, and the shock absorber is sleeved on the support round steel. The shock absorber is preferably a rubber shock absorber, and the support rod is preferably made of insulating material. The shock absorber can buffer the impact of the tower swing and vibration on the insulating tube busbar. Since the bearing structure is used to fix the bottom end of the wind power tube busbar, the axial degree of freedom is opened at the top, thereby better solving the axial expansion and contraction of the busbar during thermal expansion and contraction.

[0016] The limiting structure includes a support frame, which is welded to the tower wall. The support plate is fixed to the support frame by bolts, and the support plate is provided with a mounting hole, a wear-resistant sleeve is fixed to the mounting hole, and a shock-absorbing ring is provided between the wear-resistant sleeve and the hole wall. The wind power tube busbar is arranged in the wear-resistant sleeve, and is clearance-matched with the wear-resistant sleeve. When the wind power tube busbar expands and contracts with heat, it can slide freely in the axial direction of the inner cavity of the wear-resistant sleeve, and realize synchronous swing with the tower under the radial support of the wear-resistant sleeve.

[0017] The support plate can be made into a split assembly structure. The shock-absorbing ring can reduce the impact of the tower swing and vibration on the busbar. The support plate, wear-resistant sleeve and shock-absorbing ring are preferably made of insulating materials to further improve the reliability of insulation.

[0018] The advantages of the present invention are as follows: the insulation of the wind power tube busbar, terminal shielding tube and intermediate shielding tube all adopts capacitive insulation, realizing reliable insulation of the wiring at both ends of the busbar and the intermediate joint parts. The entire outer surface of the equipment from the incoming line end to the outgoing line end is at ground potential, with high safety and reliability, and can meet the power transmission needs of large-capacity wind turbines, covering the application range of various voltages for power transmission in wind power towers. Description of the drawings:

[0020] Fig. 1 is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the wind power tube busbar in the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the shielding tube in the present invention;

[0023] Figure 4 It is a schematic diagram of the connection state of the current-carrying body of the first wind power tube busbar and the current-carrying body of the second wind power tube busbar in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the limiting structure in the present invention;

[0025] Figure 6It is a structural schematic diagram of the bearing structure in the present invention. Specific implementation method:

[0027] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] This embodiment is preferably implemented with the converter side voltage of 3kV and the common mode voltage of 5kV as the setting requirements. In this embodiment, according to the ABC three-phase system of the double-winding direct-drive wind turbine generator, it is set to 2 groups, and each group has 3 wind turbine busbars to transmit electric energy.

[0029] In this embodiment, the wind power pipe busbar and shielding tube are all preferably capacitive insulation.

[0030] Reference Figure 1 , it includes several wind power tube busbars 1, shielding tubes 2, limiting structures 3, and bearing structures 4;

[0031] The plurality of wind power tube busbars include a plurality of first wind power tube busbars and a plurality of second wind power tube busbars of the same structure, and the shielding cylinder includes a first terminal shielding cylinder, a second terminal shielding cylinder, and an intermediate shielding cylinder of the same structure;

[0032] The connection insulation between the first wind turbine busbar and the second wind turbine busbar is realized through the middle shielding tube, and the insulation of the connection between the upper end of the first wind turbine busbar and the cable is realized through the first terminal shielding tube; the insulation of the connection between the lower end of the second wind turbine busbar and the cable and the bearing structure is realized through the second terminal shielding tube; the limiting structure is arranged in the radial direction of the wind turbine busbar at a certain interval to realize the radial support and axial sliding function of the busbar.

[0033] Reference Figure 2 The first wind power tube busbar and the second wind power tube busbar both include a current carrier 1-1, a capacitor screen 1-2 is provided outside the current carrier, a sheath 1-3 is provided outside the capacitor screen, the capacitor screens are preferably shortened in an arithmetic progression from the inside to the outside, insulating materials are filled between the capacitor screens, the outermost capacitor screen is provided with a grounding wire 1-4 connected to the ground, and the grounding wire extends from the sheath; the outer surface of the wind power tube busbar is at ground potential, the two ends of the sheath are bonded to the current carrier by adhesive 1-5, and both ends of the current carrier extend from the sheath. Connecting terminals 1-6 can be provided at the two ends of the current carrier extending from the sheath as needed. The first wind power tube busbar is preferably provided with connecting terminals at the top of the current carrier for connecting cables and fixing the first terminal shielding tube; the second wind power tube busbar is preferably provided with connecting terminals at the bottom of the current carrier for connecting cables and the bearing structure and fixing the second terminal shielding tube.

[0034] Reference Figure 3The shielding tube includes a support tube 2-2, plugs 2-1 are provided at both ends of the support tube, at least one plug is provided with a grounding lead 2-6, an equipotential tube 2-5 is installed in the support tube, a capacitor screen 2-3 is provided outside the support tube, the innermost capacitor screen is connected to the equipotential tube, the outermost capacitor screen is connected to the plug at the same potential, and insulating materials are filled between the capacitor screens. The capacitor screens are preferably lengthened in sequence from the inside to the outside according to an arithmetic progression. A sheath 2-4 is provided outside the capacitor screen, and both ends of the sheath are bonded to the plug with an adhesive. The outer surface of the terminal shielding tube is at ground potential.

[0035] The upper end of the first wind turbine busbar extends into the lower part of the first terminal shielding tube, and is fixed to the equipotential tube in the first terminal shielding tube through the connecting terminal at the top of the first wind turbine busbar, thereby realizing the high-voltage potential connection between the innermost capacitor screen of the first terminal shielding tube and the first wind turbine busbar; the cable extends into the upper part of the first terminal shielding tube and is connected to the connecting terminal at the top of the first wind turbine busbar, and the grounding lead of the first terminal shielding tube is grounded to the tower wall, thereby realizing the ground potential of the outer surface of the shielding tube.

[0036] The lower end of the second wind turbine busbar extends into the upper part of the second terminal shielding tube, and is fixed to the equipotential tube in the second terminal shielding tube through the connecting terminal at the bottom end of the second wind turbine busbar, thereby realizing the connection between the innermost capacitor screen of the second terminal shielding tube and the high-voltage potential of the second wind turbine busbar; the cable extends into the lower part of the second terminal shielding tube and is connected to the connecting terminal at the lower end of the second wind turbine busbar, and the second terminal shielding tube sealed grounding lead is grounded to the tower wall, thereby realizing the ground potential of the outer surface of the shielding tube.

[0037] Reference Figure 4 The current carrier of the first wind power tube busbar and the current carrier of the second wind power tube busbar can be connected by mechanical connection or welding. The present invention is preferably welded, and equipotential rings 1-7 are set at the welding position. The equipotential tube in the middle shielding tube is fixed to the equipotential ring welded on the current carrier, thereby realizing the high-voltage potential connection between the innermost capacitor screen of the middle shielding tube and the wind power tube busbar; after the middle shielding tube blocks the grounding lead and is grounded to the tower wall, the outer surface of the shielding tube realizes the ground potential.

[0038] The welding method is as follows: an outer lining tube 1-8 is arranged, the upper end of the outer lining tube is welded to the lower end of the carrier of the first wind turbine tube busbar, the lower end of the outer lining tube is welded to the upper end of the carrier of the second wind turbine tube busbar, the outer lining tube is provided with an equipotential ring 1-7, and the equipotential ring is provided with a thread for fixed connection with the equipotential tube of the middle shielding tube.

[0039] Reference Figure 6The bearing structure 4 includes a support rod 4-3, a shock absorber 4-2, and a support round steel 4-1. The number of support rods, shock absorbers, and support round steels is the same. The number of support rods is the same as the number of terminal shielding tubes. The upper end of each support rod is respectively inserted into the axial hole of the connecting terminal at the bottom end of the second wind power busbar, and the lower end of each support rod is respectively inserted into the axial hole at the top of the shock absorber. The support round steel is welded to the tower wall, and the shock absorber is mounted on the support round steel. The shock absorber is preferably a rubber shock absorber, and the support rod is preferably made of insulating material. The shock absorber can buffer the impact of the tower swing and vibration on the insulating tube busbar. Since the bearing structure is used to fix the bottom end of the wind power tube busbar, the axial degree of freedom is opened at the top, thereby better solving the axial expansion and contraction of the busbar during thermal expansion and contraction.

[0040] Reference Figure 5 The limiting structure 3 includes a support frame 3-1, which is welded to the tower wall. The support plate 3-2 is fixed to the support frame by bolts, and the support plate is provided with a mounting hole, and a wear-resistant sleeve 3-3 is fixed to the mounting hole, and a shock-absorbing ring 3-4 is provided between the wear-resistant sleeve and the hole wall. The wind power tube busbar is arranged in the wear-resistant sleeve, and is clearance-matched with the wear-resistant sleeve. When the wind power tube busbar expands and contracts with heat, it can slide freely in the axial direction of the inner cavity of the wear-resistant sleeve, and realize synchronous swing with the tower under the radial support of the wear-resistant sleeve.

[0041] The support plate can be made into a split assembly structure. The shock-absorbing ring can reduce the impact of the tower swing and vibration on the busbar. The support plate, wear-resistant sleeve and shock-absorbing ring are preferably made of insulating materials to further improve the reliability of insulation.

[0042] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-voltage fully shielded wind power tube busbar device for large-capacity wind turbines, characterized by: It comprises a plurality of wind power tube busbars (1) and shielding tubes (2); the wind power tube busbars and the shielding tubes are both capacitive insulation; The plurality of wind power tube busbars include a plurality of first wind power tube busbars and a plurality of second wind power tube busbars of the same structure, and the shielding cylinder includes a first terminal shielding cylinder, a second terminal shielding cylinder, and an intermediate shielding cylinder of the same structure; The corresponding connection insulation between the first wind power tube busbar and the second wind power tube busbar is realized through the middle shielding tube, and the insulation between the upper end of the first wind power tube busbar and the cable is realized through the first terminal shielding tube; the insulation between the lower end of the second wind power tube busbar and the cable is realized through the second terminal shielding tube; The first wind turbine busbar and the second wind turbine busbar comprise a current carrier (1-1), a first capacitor screen (1-2) is arranged outside the current carrier, a sheath (1-3) is arranged outside the first capacitor screen, a grounding wire (1-4) is arranged on the outermost first capacitor screen and is connected to the ground, and the grounding wire extends from the sheath; the outer surface of the wind turbine busbar is at ground potential, two ends of the sheath are bonded to the current carrier by an adhesive (1-5), and both ends of the current carrier extend from the sheath; A connection terminal (1-6) is arranged at the end of the current carrier extending from the sheath; a connection terminal is arranged at the top of the first wind power tube busbar for connecting the cable and fixing the first terminal shielding cylinder; a connection terminal is arranged at the bottom of the second wind power tube busbar for connecting the cable and fixing the second terminal shielding cylinder; the current carrier of the first wind power tube busbar is mechanically connected or welded to the current carrier of the second wind power tube busbar, and an equipotential ring (1-7) is arranged at the connection position; The shielding tube comprises a support tube (2-2), plugs (2-1) are provided at both ends of the support tube, at least one of the plugs is provided with a grounding lead (2-6), an equipotential tube (2-5) is installed in the support tube, a second capacitor screen (2-3) is provided outside the support tube, the innermost second capacitor screen is connected to the equipotential tube at the same potential, and the outermost second capacitor screen is connected to the plug at the same potential; a sheath (2-4) is provided outside the second capacitor screen, and both ends of the sheath are bonded to the plug with an adhesive; the outer surface of the terminal shielding tube is at ground potential; The upper end of the first wind turbine busbar extends into the lower part of the first terminal shielding tube, and is fixed to the equipotential tube in the first terminal shielding tube through the connecting terminal at the top of the first wind turbine busbar, thereby realizing the high-voltage potential connection between the second capacitor screen at the innermost side of the first terminal shielding tube and the first wind turbine busbar; the cable extends into the upper part of the first terminal shielding tube and is connected to the connecting terminal at the top of the first wind turbine busbar, and the grounding lead of the first terminal shielding tube is grounded to the tower wall, thereby realizing the ground potential of the outer surface of the shielding tube; The lower end of the second wind power tube busbar extends into the upper part of the second terminal shielding tube, and is fixed to the equipotential tube in the second terminal shielding tube through the connecting terminal at the bottom end of the second wind power tube busbar, thereby realizing the high-voltage potential connection between the second capacitor screen at the innermost side of the second terminal shielding tube and the second wind power tube busbar; the cable extends into the lower part of the second terminal shielding tube and is connected to the connecting terminal at the lower end of the second wind power tube busbar, and the grounding lead of the second terminal shielding tube is connected to the tower wall, thereby realizing the ground potential of the outer surface of the shielding tube; The equipotential tube in the middle shielding tube is fixed to the equipotential ring fixed on the current carrier, thereby realizing the high-voltage potential connection between the second capacitor screen at the innermost side of the middle shielding tube and the wind power tube busbar; after the middle shielding tube sealed grounding lead is connected to the tower wall, the outer surface of the shielding tube realizes the ground potential; The first capacitor screens of the wind power tube busbar are shortened from the inside to the outside in an arithmetic progression, and insulating materials are filled between the first capacitor screens of the wind power tube busbar; insulating materials are filled between the second capacitor screens of each shielding tube, and the second capacitor screens of each shielding tube are lengthened from the inside to the outside in an arithmetic progression.

2. A high-voltage fully shielded wind power tube busbar device for a large-capacity wind turbine according to claim 1, characterized in that: It also includes a bearing structure (4), which includes a supporting rod (4-1), a shock absorber (4-2), and a supporting round steel (4-3). The number of the supporting rods, the shock absorber, and the supporting round steel is the same, and the number of the supporting rods is the same as the number of the terminal shielding tubes. The upper end of each supporting rod is respectively inserted into the axial hole of the connecting terminal at the bottom end of the second wind power busbar, and the lower end of each supporting rod is respectively inserted into the axial hole at the top of the shock absorber. The supporting round steel is welded to the tower wall, and the shock absorber is sleeved on the supporting round steel.

3. A high-voltage fully shielded wind power tube busbar device for a large-capacity wind turbine according to claim 1, characterized in that: It also includes a limiting structure (3), which includes a support frame (3-1) welded to the tower wall; a support plate (3-2) fixed to the support frame by bolts, the support plate is provided with a mounting hole, a wear-resistant sleeve (3-3) is fixed to the mounting hole, and a shock-absorbing ring (3-4) is provided between the wear-resistant sleeve and the hole wall; the wind power pipe busbar is arranged in the wear-resistant sleeve and is clearance-matched with the wear-resistant sleeve.

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