Quick circuit breaker for ultrahigh-voltage converter transformer

Abstract

The invention relates to a quick circuit breaker for an ultrahigh-voltage converter transformer, which comprises a circuit breaker mechanism and two fracture structures, the two fracture structures are respectively arranged at two ends in a horizontal tank body, and two particle traps are arranged at the bottom of the tank body, so that dust particles and the like can fall into the tank body; a circuit breaker mechanism adopts a structure that two groups of disc springs are symmetrically arranged to counteract impact force released by the disc springs and is fixed on a lower straight cylinder of the circuit breaker tank body through a transition plate, two sides of the mechanism are reinforced and fixed through a support frame, the circuit breaker is provided with double fractures, and the insulation reliability of the circuit breaker is improved. The two arc extinguish chambers are connected together through the transmission case and symmetrically arranged on the two sides of the tank body, the whole arc extinguish chambers are fixed to a metal supporting cylinder through supporting insulators and connected with a mechanism through a lower straight cylinder, a residual magnetism monitoring device is arranged on the side face of a circuit breaker, and accurate phase selection switching-on is achieved by detecting converter transformer residual magnetism. And the excitation inrush current of the converter transformer is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage switch fast circuit breakers, and in particular to a fast circuit breaker for an ultra-high voltage converter transformer. Background Art

[0002] The short-circuit current level of the AC power grid generally exceeds the interrupting capacity of the circuit breaker, and the problem of excessive short-circuit current in 220kV and 500kV AC power grids is prominent; the circuit breaker opening time is long, which has a great impact on the power grid system and endangers the safety of the power grid and equipment.

[0003] Existing short-circuit current suppression measures such as outage lines, busbar splitting, and installation of current limiters have many disadvantages, such as reduced power supply reliability, reduced transmission capacity, and increased losses. Moreover, current limiters of different topology schemes are large in size, complex in structure, and high in cost, which makes them difficult to promote and apply in ultra-high voltage power grids.

[0004] New short-circuit current suppression technology: Based on the key technology of fast breaking, the system topology is adjusted dynamically, and multiple feeder branches connected to the grid fault point are quickly isolated to achieve flexible suppression of grid short-circuit current, which can reduce the short-circuit level by more than 40%. According to the research on the control strategy of the new technology for suppressing grid short-circuit current, the fast-breaking circuit breaker should complete the system topology adjustment within the opening time of the conventional circuit breaker, and the rated short-circuit current full breaking time of the fast-breaking circuit breaker is ≤25ms, meeting the short-circuit current suppression requirements. The fast circuit breaker can effectively block the circuit breaker current and significantly reduce the level of the circuit breaker current, thereby improving the stability of the power grid system.

[0005] Suppressing the short-circuit current level of the power system is one of the effective means to maintain the stable operation of the power grid. The fast circuit breaker can quickly isolate the fault line and effectively reduce the short-circuit current level. Therefore, the fast circuit breaker can improve the stability of the power grid operation by isolating the fault line. Developing a fast circuit breaker that meets the requirements is of great significance to improving the stability of the power grid. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a fast circuit breaker for an ultra-high voltage converter transformer.

[0007] The present invention is achieved through the following technical scheme, which provides a fast circuit breaker for ultra-high voltage converter transformer, including a circuit breaker mechanism and two fracture structures, the two fracture structures are respectively arranged at the two ends of a horizontal tank body, two particulate collectors are installed at the bottom of the tank body, and the two particulate collectors are respectively located below the two fracture structures, the particulate collector includes an aluminum mesh plate located inside the tank body, one end of the aluminum mesh plate is fixedly connected to an end connecting plate, an end damping block fixed to the tank body is fixedly connected to the end connecting plate, the lower end of the aluminum mesh plate is fixedly connected to a lower connecting plate, the lower end of the tank body is connected and fixedly connected to a mounting tube, the lower connecting plate is fixedly connected to a lower damping block fixed to the inner wall of the mounting tube, the lower end of the aluminum mesh plate is fixedly connected to an excitation motor mounting plate, the excitation motor located in the mounting tube is fixedly connected to the excitation motor mounting plate, the lower end of the mounting tube is sealed and fixedly connected to a flange cover plate, the lower end of the flange cover plate is connected and fixedly connected to a mounting shell, and the motor controller of the excitation motor is fixedly connected in the mounting shell.

[0008] As an optimization, the aluminum mesh plate is an arc-shaped plate and is coaxial with the tank body, and the mesh holes on the aluminum mesh plate are long holes and extend along the arc direction.

[0009] As an optimization, the end connecting plate is fixedly connected to one end close to the end of the tank body.

[0010] As an optimization, the circuit breaker mechanism is fixed in a mechanism housing, the lower end of the middle portion of the tank body is connected and fixed with a lower straight tube, and the mechanism housing is fixed to the lower end of the lower straight tube.

[0011] As an optimization, the lower end of the middle part of the tank body is fixedly connected with a lower straight tube guard plate, the lower straight tube is fixedly connected to the lower end of the lower straight tube guard plate, and a plurality of lower straight tube reinforcement ribs are fixedly connected between the lower straight tube guard plate and the lower straight tube.

[0012] As an optimization, the two ends of the mechanism housing in the horizontal direction are respectively supported by support frames, and the support frames include a bottom support beam, two support columns fixed to the bottom support beam, and a top support plate fixed to the upper ends of the support columns, and a mounting plate fixed to the top support plate that is attached to the side of the mechanism housing, and the mounting plate is connected to the side bolts of the mechanism housing through mounting holes.

[0013] As an optimization, the mounting hole is a vertical long hole, and a tightening bolt that presses the mechanism housing upward is threadedly connected on the top support plate.

[0014] As an optimization, a supporting leg guard plate is fixedly connected to the lower end of the tank body, and a supporting leg is fixedly connected to the lower end of the supporting leg guard plate.

[0015] As an optimization, the upper end of the tank body is connected and fixedly connected to two upper straight cylinders, insulators are fixedly connected inside the upper straight cylinders, a conductive rod is fixedly connected to the center of the insulator, and the static contacts of the two fracture structures are respectively connected to the two conductive rods.

[0016] As an optimization, an upper straight tube guard plate is fixedly connected to the upper end of the tank body, the upper straight tube is fixedly connected to the upper end of the upper straight tube guard plate, and a plurality of upper straight tube reinforcing ribs are fixedly connected between the upper straight tube and the upper straight tube guard plate.

[0017] The beneficial effects of the present invention are: 1. The circuit breaker mechanism adopts a structure with two sets of disc springs arranged symmetrically to offset the impact force released by the disc springs, and is fixed to the lower straight tube of the circuit breaker tank through a transition plate. The two sides of the mechanism are strengthened and fixed by support frames.

[0018] 2. The circuit breaker has double breaks. The two arc extinguishing chambers are connected together through a transmission box and symmetrically arranged on both sides of the tank. The arc extinguishing chambers are generally fixed on the metal support cylinder through supporting insulators and connected to the mechanism through the lower straight cylinder.

[0019] 3. A residual magnetism monitoring device is installed on the side of the circuit breaker, which can detect the residual magnetism of the commutator transformer to achieve accurate phase selection and closing, greatly reducing the excitation inrush current of the commutator transformer.

[0020] 5. A particle collector is installed on the bottom of the tank body, which can trap dust particles inside it, prevent the arc extinguishing chamber of the circuit breaker from discharging to the tank body due to foreign matter, and improve the insulation reliability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an internal front view of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 It is a front view of the present invention; Figure 4 It is a schematic diagram of the structure of the particle collector of the present invention; Figure 5 It is a front view of the particle trap of the present invention; Figure 6 is a front cross-sectional view of the particle trap of the present invention; Figure 7 It is a structural schematic diagram of the support frame of the present invention; Figure 8 It is a front view of the support frame of the present invention; Fig. 9 This is a schematic diagram of the installation of the photoelectric displacement sensor of the present invention; As shown in the figure: 1. Circuit breaker mechanism, 2. Tank, 3. Particle collector, 31. Aluminum mesh plate, 32. End connecting plate, 33. End shock absorber, 34. Lower connecting plate, 35. Lower shock absorber, 36. Mounting cylinder, 37. Excitation motor, 38. Excitation motor mounting plate, 39. Flange cover, 310. Mounting shell, 311. Motor controller, 4. Support frame, 41. Bottom support beam, 42. Support column, 43. Top support plate, 44. Mounting plate, 45. Mounting hole, 46. Tightening bolt, 47. Middle connecting beam, 5, mechanism housing, 6, transition plate, 7, lower straight tube, 8, support insulator, 9, transmission box, 10, moving side insulating support tube, 11, static side insulating support tube, 12, shielding cover, 13, upper straight tube, 14, support leg, 15, residual magnetic monitoring device, 16, support leg guard plate, 17, lower straight tube guard plate, 18, lower straight tube reinforcement rib, 19, upper straight tube guard plate, 20, upper straight tube reinforcement rib, 21, base, 22, clamp, 23, baffle, 24, photoelectric displacement sensor, 25, mounting plate. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0023] like Figures 1 to 9 As shown, a fast circuit breaker for ultra-high voltage converter transformer of the present invention comprises a circuit breaker mechanism 1 and two break structures, the two break structures are respectively arranged at two ends inside a horizontal tank 2, each break structure is divided into a moving end part and a static end part, the moving end and the static end are respectively equipped with a shielding cover 12, the two break structures are connected together through a transmission box, and are symmetrically arranged at two ends of the tank. The entire fast circuit breaker is fixed on a base 21, and the base 21 is fixed on the ground.

[0024] The static contact of the fracture structure is supported by the static side insulating support tube 11. The upper end of the tank body 2 is connected and fixedly connected with two upper straight tubes 13. Insulators are fixedly connected in the upper straight tubes 13. A conductive rod is fixedly connected in the center of the insulator. The static contacts of the two fracture structures are respectively connected to the two conductive rods.

[0025] An upper straight tube guard plate 19 is fixedly connected to the upper end of the tank body 2, and the upper straight tube 13 is fixedly connected to the upper end of the upper straight tube guard plate 19. A plurality of upper straight tube reinforcement ribs 20 are fixedly connected between the upper straight tube 13 and the upper straight tube guard plate 19, thereby improving the overall strength.

[0026] The moving contact of the break structure is supported by the moving side insulating support cylinder 10. The circuit breaker mechanism 1 drives the two moving contacts to move synchronously and symmetrically in opposite directions through the transmission box 9. The circuit breaker mechanism 1 is fixed in the mechanism housing 5. The mechanism housing 5 is located below the middle of the tank body 2. The lower end of the middle of the tank body 2 is connected and fixed with the lower straight cylinder 7. The mechanism housing 5 is fixed to the lower end of the lower straight cylinder 7 through the transition plate 6. A support insulator 8 is arranged in the lower straight cylinder 7, and the mechanism output pull rod of the circuit breaker mechanism 1 passes through the support insulator 8.

[0027] like Fig. 9 As shown, two photoelectric displacement sensors 24 are arranged on the side of the output pull rod of the circuit breaker mechanism 1, and the photoelectric displacement sensor 24 is mounted on a mounting plate 25, and the mounting plate 25 is fixed to the circuit breaker mechanism 1 by bolts. A clamp 22 is fixedly connected to the output pull rod of the circuit breaker mechanism 1, and a baffle 23 adapted to the two photoelectric displacement sensors 24 is fixedly connected to the clamp. The two photoelectric displacement sensors 24 are respectively located at the opening position and the closing position of the circuit breaker. When the baffle blocks or does not block the light beam emitted by the photoelectric displacement sensor, the photoelectric displacement sensor will send a corresponding signal to the background, and the background determines whether the circuit breaker is in the opening position or the closing position through the feedback signal.

[0028] A lower straight tube guard plate 17 is fixedly connected to the lower end of the middle part of the tank body 2, and the lower straight tube 7 is fixedly connected to the lower end of the lower straight tube guard plate 17. A plurality of lower straight tube reinforcement ribs 18 are fixedly connected between the lower straight tube guard plate 17 and the lower straight tube 7. A plurality of lower straight tube reinforcement ribs 18 are arranged along the circumference of the lower straight tube 7 to play a reinforcement role.

[0029] The circuit breaker mechanism 1 adopts a structure in which two sets of disc springs are symmetrically arranged to offset the impact force released by the disc springs. Since the operation work of the circuit breaker mechanism 1 is relatively large, support frames 4 are designed at both ends of the mechanism housing 5. The two ends of the mechanism housing 5 in the horizontal direction are supported by the support frames 4 respectively. Figure 7 , 8 As shown, the support frame 4 includes a bottom support beam 41, two support columns 42 fixedly connected to the bottom support beam 41, and a top support plate 43 fixedly connected to the upper ends of the support columns 42. The bottom support beam 41 is an H-shaped steel, which is fixed to the base 21 by bolts. The two support columns 42 are both made of H-shaped steel, and a horizontal middle connecting beam 47 is welded between the two support columns 42, thereby connecting the two support columns 42 into one.

[0030] The top support plate 43 is horizontally arranged and welded to the upper ends of the two support columns 42. The top support plate 43 is fixedly connected to a mounting plate 44 attached to the side of the mechanism housing 5. The mounting plate 44 is bolted to the side of the mechanism housing 5 through the mounting hole 45. In this embodiment, the mounting hole 45 is a vertical long hole, so the relative height between the mechanism housing 5 and the mounting plate 44 can be adjusted before the bolts are tightened, and the bolts are tightened after the adjustment is completed.

[0031] The top support plate 43 is threadedly connected with a tightening bolt 46 for tightening the mechanism housing 5 upward. Specifically, a protruding portion is provided on the side of the upper end of the mechanism housing 5, and the tightening bolt 46 is located below the protruding portion. By tightening the tightening bolt 46, the mechanism housing 5 can be driven to adjust up and down to a suitable position. After the adjustment is completed, the bolts between the mechanism housing 5 and the mounting plate 44 are tightened.

[0032] The lower end of the tank body 2 is fixedly connected with a support leg guard plate 16, and the lower end of the support leg guard plate 16 is fixedly connected with a support leg 14. The support leg 14 is fixed to the base 21 by bolts.

[0033] A residual magnetism monitoring device 15 is installed on the side of the tank body 2. The VFTO data of the circuit breaker is collected through the residual magnetism monitoring device, and the residual magnetism data of the converter transformer is finally determined through calculation and judgment. According to the measured residual magnetism data, the phase selection closing device determines the required closing phase, and the closing operation is performed according to the calculated phase. The circuit breaker is closed at the required phase, which minimizes the excitation inrush current of the converter transformer and protects the safety of the converter transformer.

[0034] Two particle collectors 3 are installed at the bottom of the tank body 2. The two particle collectors 3 are respectively located under the two fracture structures, and can trap dust particles and the like inside, thereby preventing the arc extinguishing chamber of the circuit breaker from discharging to the tank body due to foreign matter, thereby improving the insulation reliability of the circuit breaker.

[0035] like Figure 4-6 As shown, the particle collector 3 includes an aluminum mesh plate 31 located inside the can body 2. The aluminum mesh plate 31 is an arc-shaped plate and is coaxial with the can body 2. The mesh holes on the aluminum mesh plate 31 are long holes and extend along the arc direction.

[0036] One end of the aluminum mesh plate 31 is fixedly connected to three end connecting plates 32, and the end connecting plate 32 is fixedly connected to one end near the end of the tank body 2. The end connecting plate 32 is fixedly connected to an end damping block 33 fixed to the tank body 2, and the end damping block 33 is fixedly connected to the inner wall of the tank body 2 by bolts. The lower end of the aluminum mesh plate 31 is fixedly connected to two lower connecting plates 34, and the lower end of the tank body 2 is connected and fixedly connected to a mounting tube 36, and the lower connecting plate 34 is fixedly connected to a lower damping block 35 fixedly connected to the inner wall of the mounting tube 36, and the two lower damping blocks 35 are respectively fixed to the two sides of the inner wall of the mounting tube 36 by bolts.

[0037] The lower end of the aluminum mesh plate 31 is fixedly connected to an exciting motor mounting plate 38, and the exciting motor mounting plate 38 is fixedly connected to an exciting motor 37 located in a mounting tube 36, thereby generating vibration to drive the aluminum mesh plate 31 to vibrate, thereby facilitating the falling of particles.

[0038] The lower end of the mounting tube 36 is sealed and fixedly connected with a flange cover plate 39, and the lower end of the flange cover plate 39 is connected and fixedly connected with a mounting shell 310. The motor controller 311 of the excitation motor 37 is fixedly connected in the mounting shell 310, thereby being isolated from the interior of the tank.

[0039] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A fast circuit breaker for an ultra-high voltage converter transformer, comprising a circuit breaker mechanism (1) and two fracture structures, wherein the two fracture structures are respectively arranged at two ends inside a horizontal tank body (2), and characterized in that: Two particle collectors (3) are installed at the bottom of the tank body (2), and the two particle collectors (3) are respectively located below the two fracture structures. The particle collectors (3) include an aluminum mesh plate (31) located inside the tank body (2), one end of the aluminum mesh plate (31) is fixedly connected to an end connecting plate (32), and an end shock absorbing block (33) fixedly connected to the tank body (2) is fixedly connected to the end connecting plate (32), the lower end of the aluminum mesh plate (31) is fixedly connected to a lower connecting plate (34), and the lower end of the tank body (2) is connected to a mounting tube (36). A lower damping block (35) fixedly connected to the inner wall of the mounting tube (36) is fixedly connected to the lower connecting plate (34); an exciting motor mounting plate (38) is fixedly connected to the lower end of the aluminum mesh plate (31); an exciting motor (37) located in the mounting tube (36) is fixedly connected to the exciting motor mounting plate (38); a flange cover plate (39) is sealed and fixedly connected to the lower end of the mounting tube (36); a mounting shell (310) is connected and fixedly connected to the lower end of the flange cover plate (39); and a motor controller (311) of the exciting motor (37) is fixedly connected in the mounting shell (310).

2. The ultra-high voltage converter transformer fast circuit breaker according to claim 1, characterized in that: The aluminum mesh plate (31) is an arc-shaped plate and is coaxial with the tank body (2); the mesh holes on the aluminum mesh plate (31) are long holes and extend in an arc-shaped direction.

3. The ultra-high voltage converter transformer fast circuit breaker according to claim 1, characterized in that: The end connecting plate (32) is fixedly connected to one end close to the end of the tank body (2).

4. The ultra-high voltage converter transformer fast circuit breaker according to claim 1, characterized in that: The circuit breaker mechanism (1) is fixedly connected in a mechanism housing (5); the lower end of the middle portion of the tank body (2) is connected and fixedly connected to a lower straight cylinder (7); and the mechanism housing (5) is fixedly connected to the lower end of the lower straight cylinder (7).

5. The ultra-high voltage converter transformer fast circuit breaker according to claim 4, characterized in that: A lower straight tube guard plate (17) is fixedly connected to the lower end of the middle portion of the tank body (2), the lower straight tube (7) is fixedly connected to the lower end of the lower straight tube guard plate (17), and a plurality of lower straight tube reinforcing ribs (18) are fixedly connected between the lower straight tube guard plate (17) and the lower straight tube (7).

6. The ultra-high voltage converter transformer fast circuit breaker according to claim 4, characterized in that: The two ends of the mechanism housing (5) in the horizontal direction are respectively supported by a support frame (4), the support frame (4) comprising a bottom support beam (41), two support columns (42) fixedly connected to the bottom support beam (41), and a top support plate (43) fixedly connected to the upper ends of the support columns (42), the top support plate (43) being fixedly connected to a mounting plate (44) affixed to the side of the mechanism housing (5), the mounting plate (44) being bolted to the side of the mechanism housing (5) via mounting holes (45).

7. The fast circuit breaker for ultra-high voltage converter transformer according to claim 6, characterized in that: The mounting hole (45) is a vertical long hole, and a tightening bolt (46) for tightening the mechanism housing (5) upward is threadedly connected to the top support plate (43).

8. The fast circuit breaker for ultra-high voltage converter transformer according to claim 1, characterized in that: The lower end of the tank body (2) is fitted and fixedly connected to a support leg guard plate (16), and the lower end of the support leg guard plate (16) is fixedly connected to a support leg (14).

9. The ultra-high voltage converter transformer fast circuit breaker according to claim 1, characterized in that: The upper end of the tank body (2) is connected and fixedly connected to two upper straight cylinders (13), an insulator is fixedly connected inside the upper straight cylinder (13), a conductive rod is fixedly connected to the center of the insulator, and two static contacts with fracture structures are respectively connected to the two conductive rods.

10. The fast circuit breaker for ultra-high voltage converter transformer according to claim 9, characterized in that: An upper straight tube guard plate (19) is fixedly connected to the upper end of the tank body (2), the upper straight tube (13) is fixedly connected to the upper end of the upper straight tube guard plate (19), and a plurality of upper straight tube reinforcing ribs (20) are fixedly connected between the upper straight tube (13) and the upper straight tube guard plate (19).

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