An inflatable combined switch for box transformer and box transformer substation

Abstract

The application relates to an inflatable combined switch for a box transformer and a box transformer substation. The inflatable combined switch for the box transformer comprises a sealed box body for filling insulation gas, the opening and closing directions of the three-position switch and the circuit breaker of each main circuit of the sealed box body extend in the same direction horizontally, the incoming and outgoing line bushings are sealingly installed on the box wall of the sealed box body, the incoming and outgoing line bushings are respectively connected with the static terminals of the three-position switch and the circuit breaker in the sealed box body, and the operating module for driving the opening and closing actions of the three-position switch and the circuit breaker is installed outside the box wall of the sealed box body. The application develops the inflatable combined switch for the box transformer, integrates the circuit breaker and the three-position switch in the sealed box body to form a combined switch in an insulation gas atmosphere, and is used in the box body of the box transformer substation, is protected by two layers of box bodies, is not affected by the external environment, and has improved operation stability and reliability, and reduces the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of protection switch technology, and in particular to a gas-filled combination switch for box-type substations and a box-type substation. Background Technology

[0002] Currently, the high-voltage switchgear units in wind turbine transformer substations generally employ open-type integrated vacuum circuit breaker combinations or load switches combined with fuses. Among these, the load switch plus fuse combination has weak breaking capacity, typically not exceeding 20kA for short-circuit breaking, and its reliability is generally low. Therefore, with the continuous increase in wind power output, open-type integrated vacuum circuit breaker combinations are more widely used. However, open-type integrated vacuum circuit breaker combinations require independent installation and arrangement of the circuit breaker and disconnector components, resulting in a larger space occupation. Furthermore, this type of combination switch is susceptible to environmental influences, especially exhibiting low reliability in high-altitude areas, requiring regular maintenance and resulting in higher operating and maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to provide a gas-insulated combination switch for prefabricated substations, thereby solving the problems of large space occupation, susceptibility to environmental influences, and low reliability of existing open-type vacuum circuit breaker combination switches. Another purpose of this invention is to provide a prefabricated substation using the aforementioned gas-insulated combination switch, thereby solving the problems of low reliability and high maintenance costs of existing prefabricated substations.

[0004] The gas-filled combination switch for prefabricated substations of the present invention includes a sealed enclosure for filling with insulating gas. A three-phase main circuit is arranged inside the sealed enclosure. Each main circuit includes a three-position switch and a circuit breaker arranged vertically at intervals. The opening and closing directions of the three-position switch and the circuit breaker are both horizontally extended in the same direction. Inlet and outlet bushings are sealed and installed on the enclosure wall. The inlet and outlet bushings are respectively connected to the stationary terminals of the three-position switch and the circuit breaker inside the sealed enclosure. An operating module for driving the opening and closing actions of the three-position switch and the circuit breaker is installed on the outside of the enclosure wall.

[0005] This invention innovatively proposes a gas-filled combination switch for prefabricated substations, which integrates a circuit breaker and a three-position switch into a sealed enclosure to form a combination switch in an insulating gas atmosphere. This ensures reliable breaking performance. Moreover, during use, it is located inside the enclosure of the prefabricated substation and is protected by two layers of enclosures. The circuit breaker and three-position switch are not affected by the external environment, and the operational stability and reliability are greatly improved, reducing maintenance costs.

[0006] Furthermore, the incoming bushing is installed on the opposite side wall of the three-position switch, and diagonally above the three-position switch. The incoming bushing extends horizontally, and an incoming branch line connecting the three-position switch and the incoming bushing is set in the space between the top wall of the sealed enclosure and the three-position switch. This arrangement makes full use of the width and height dimensions of the sealed enclosure, making the internal structure more compact and reducing the space occupied by the combination switch.

[0007] Furthermore, the three-position switch and the circuit breaker are installed on the same wall of the enclosure, with the three-position switch positioned above the circuit breaker, and an intermediate branch row is installed in the space between them. This arrangement does not require occupying too much space in the width direction, utilizing the existing space between the three-position switch and the circuit breaker, nor does it excessively increase the height interval between them, thus contributing to the compactness of the structure and the miniaturization of the combined switch.

[0008] Furthermore, the outgoing bushing is installed on the bottom wall of the sealed enclosure and extends downwards. The connecting end of the outgoing bushing inside the enclosure extends to the position between the stationary end of the circuit breaker and the opposite side wall of the enclosure. This arrangement facilitates outgoing lines, and the fact that the inlet and outlet bushings are located on different sides of the sealed enclosure facilitates phase-to-phase insulation. The position of the connecting end inside the outgoing bushing between the stationary end of the circuit breaker and the opposite side wall allows for the utilization of the horizontal space occupied by the connecting end of the inlet bushing extending into the sealed enclosure, resulting in more efficient space utilization.

[0009] Furthermore, among the three-phase incoming bushings and / or three-phase outgoing bushings arranged at intervals in the same plane, the two bushings on both sides are fixedly mounted on the sealed enclosure by bushing supports. The bushing supports are inclined mounting brackets so that the two bushings extend outwards at opposite angles. This arrangement can minimize the size of the sealed enclosure and reduce the space occupied by the combined switch while ensuring the phase-to-phase insulation distance.

[0010] The prefabricated substation of the present invention includes a box, in which a gas-filled combination switch is fixedly installed. The gas-filled combination switch includes a sealed enclosure for filling with insulating gas. A three-phase main circuit is arranged inside the sealed enclosure. Each main circuit includes a three-position switch and a circuit breaker arranged vertically at intervals. The opening and closing directions of the three-position switch and the circuit breaker are both horizontally extended in the same direction. Incoming and outgoing bushings are sealed and installed on the wall of the sealed enclosure. The incoming and outgoing bushings are respectively connected to the stationary terminals of the three-position switch and the circuit breaker inside the sealed enclosure. An operating module for driving the opening and closing actions of the three-position switch and the circuit breaker is installed on the outside of the wall of the sealed enclosure.

[0011] This invention improves upon prefabricated substations by modifying their open-type vacuum circuit breaker combination switch structure into a gas-filled combination switch for prefabricated substations. The circuit breaker and three-position switch are integrated into a sealed enclosure, forming a combination switch within an insulating gas atmosphere. This ensures reliable breaking performance. Furthermore, the gas-filled combination switch for prefabricated substations is located inside the enclosure of the prefabricated substation, protected by two layers of enclosures. The circuit breaker and three-position switch are unaffected by the external environment, significantly improving operational stability and reliability, and reducing maintenance costs.

[0012] Furthermore, the incoming bushing is installed on the opposite side wall of the three-position switch, and diagonally above the three-position switch. The incoming bushing extends horizontally, and an incoming branch line connecting the three-position switch and the incoming bushing is set in the space between the top wall of the sealed enclosure and the three-position switch. This arrangement makes full use of the width and height dimensions of the sealed enclosure, making the internal structure more compact and reducing the space occupied by the combination switch.

[0013] Furthermore, the three-position switch and the circuit breaker are installed on the same wall of the enclosure, with the three-position switch positioned above the circuit breaker, and an intermediate branch row is installed in the space between them. This arrangement does not require occupying too much space in the width direction, utilizing the existing space between the three-position switch and the circuit breaker, nor does it excessively increase the height interval between them, thus contributing to the compactness of the structure and the miniaturization of the combined switch.

[0014] Furthermore, the outgoing bushing is installed on the bottom wall of the sealed enclosure and extends downwards. The connecting end of the outgoing bushing inside the enclosure extends to the position between the stationary end of the circuit breaker and the opposite side wall of the enclosure. This arrangement facilitates outgoing lines, and the fact that the inlet and outlet bushings are located on different sides of the sealed enclosure facilitates phase-to-phase insulation. The position of the connecting end inside the outgoing bushing between the stationary end of the circuit breaker and the opposite side wall allows for the utilization of the horizontal space occupied by the connecting end of the inlet bushing extending into the sealed enclosure, resulting in more efficient space utilization.

[0015] Furthermore, among the three-phase incoming bushings and / or three-phase outgoing bushings arranged at intervals in the same plane, the two bushings on both sides are fixedly mounted on the sealed enclosure by bushing supports. The bushing supports are inclined mounting brackets so that the two bushings extend outwards at opposite angles. This arrangement can minimize the size of the sealed enclosure and reduce the space occupied by the combined switch while ensuring the phase-to-phase insulation distance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment 1 of the gas-filled combination switch for a transformer substation according to the present invention;

[0017] Figure 2 for Figure 1 The left view;

[0018] Figure 3 for Figure 1 Structural diagram of the middle cabinet;

[0019] Figure 4 for Figure 1 A schematic diagram of the circuit breaker;

[0020] Figure 5 for Figure 4 Schematic diagram of the circuit breaker body;

[0021] Figure 6 for Figure 1 Schematic diagram of the structure of a three-position switch;

[0022] Figure 7 This is a schematic diagram of the sleeve support structure.

[0023] In the diagram: 1. Sealed enclosure; 2. Circuit breaker unit; 3. Disconnecting switch unit; 4. Outgoing bushing; 5. Outgoing branch line; 6. Intermediate branch line; 7. Incoming branch line; 8. Incoming bushing; 12. Bushing support; 21. Circuit breaker operating mechanism; 22. Bellows; 23. Circuit breaker support plate; 24. Single pole; 241. Single pole support; 242. Insulating tie rod; 243. Rear outgoing terminal block; 244. Conductive clamp; 245. Vacuum bulb; 246. Circuit breaker support rod; 247. Front outgoing terminal block; 31. Disconnecting switch operating mechanism; 32. Switch support plate; 33. Grounding contact; 34. Drive screw; 35. Intermediate stationary contact; 36. Moving contact; 37. Isolating stationary contact; 38. Switch support rod. Detailed Implementation

[0024] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0025] Embodiment 1 of the prefabricated substation of the present invention:

[0026] The prefabricated substation of this invention improves upon the open-type vacuum circuit breaker combination switch by integrating the circuit breaker and three-position switch into a gas-filled combination switch within a sealed enclosure 1 filled with insulating gas. Through the enclosure of the prefabricated substation and the sealed enclosure 1 of the gas-filled combination switch itself, better sealing and protection are achieved for the circuit breaker and three-position switch. The circuit breaker and three-position switch are unaffected by the external environment, significantly improving operational stability and reliability, and reducing maintenance costs. Furthermore, the circuit breaker and three-position switch are situated in an insulating gas atmosphere, improving insulation performance, further reducing insulation distance, resulting in a smaller overall footprint, higher integration, and reliable performance even in high-altitude areas.

[0027] Specifically, this embodiment uses a 40.5kV wind power prefabricated substation as an example for illustration. Of course, it can be applied to prefabricated substations of other voltage levels. The prefabricated substation includes a main enclosure and electrical equipment installed inside the main enclosure. The electrical equipment includes a gas-insulated switchgear, the specific structure of which is as follows... Figure 1-7 As shown, for ease of explanation, Figure 1 The description is based on the indicated orientation.

[0028] The gas-filled combination switch includes a sealed enclosure 1, which is made of stainless steel and filled with SF6 gas. A three-phase main circuit is arranged inside the sealed enclosure 1. Three-phase incoming bushings 8 and outgoing bushings 4, corresponding to the three-phase main circuit, are sealed and installed on the walls of the enclosure 1. Each of the three-phase main circuits includes a three-position switch unit and a circuit breaker unit 2 connected in series. The three-phase main circuits are arranged side-by-side inside the sealed enclosure 1.

[0029] The sealed enclosure 1 is hoisted and installed inside the prefabricated substation via top lifting lugs. The sealed enclosure 1 is made of 3mm stainless steel and has reinforcing ribs welded inside and out to improve its strength. Of the three-phase incoming bushings 8 and three-phase outgoing bushings 4, the two bushings on the outer side in the parallel direction are mounted on the sealed enclosure 1 via bushing brackets 12 fixedly connected to it. The bushing mounting surface on the bushing bracket 12 and the fixed connection surface for connecting to the sealed enclosure 1 form a 20° angle, causing the two bushings to tilt towards opposite phases. This ensures an increase in the phase spacing between the incoming and outgoing lines without increasing the volume of the sealed enclosure 1. The air clearance between the bushings is 400mm, meeting the insulation requirements for high altitudes.

[0030] The three-position switch unit of the main circuit is located above the circuit breaker unit 2. The three-position switch and the circuit breaker are installed on the same enclosure wall, i.e., the left enclosure wall in the diagram. The incoming bushing 8 is installed on the opposite enclosure wall of the three-position switch, i.e., the right enclosure wall in the diagram. The incoming bushing 8 is located diagonally above the three-position switch. An incoming branch 7 connecting the three-position switch and the incoming bushing 8 is set in the space between the top wall of the sealed enclosure 1 and the three-position switch. This arrangement can make full use of the width and height dimensions of the sealed enclosure 1, making the internal structure more compact and reducing the space occupied by the combined switch. An intermediate branch 6 is set in the space between the three-position switch and the circuit breaker. The three-phase incoming bushings 8 are arranged horizontally side by side on the right side of the box wall, and the three-phase outgoing bushings 4 are installed on the bottom box wall, arranged side by side in the front-to-back direction and extending downwards. The connecting end of the outgoing bushing 4 inside the box extends to the position between the stationary end of the circuit breaker and the opposite side box wall, utilizing the horizontal space occupied by the connecting end of the incoming bushing 8 extending into the sealed box 1, and is electrically connected to the stationary end of the circuit breaker through the L-shaped outgoing branch line 5.

[0031] The outer wall of the sealed enclosure 1 is welded with crossbeams for mounting the circuit breaker unit 2 and the three-position switch unit. The circuit breaker unit 2 and the three-position switch unit are respectively fixed on the corresponding crossbeams. The circuit breaker operating mechanism 21 and the three-position switch operating mechanism are located on the outside of the sealed enclosure 1 and do not occupy the internal space of the sealed enclosure 1.

[0032] Circuit breaker unit 2, for example Figure 4-5 As shown, the circuit breaker unit 2 includes a circuit breaker operating mechanism 21, a bellows 22, a circuit breaker support plate 23, and a single pole 24. The circuit breaker mechanism is mounted on the circuit breaker support plate 23. The single pole 24 and the bellows 22 are fixed to the circuit breaker support plate 23 by bolts. A sealing ring is installed between the bellows 22 and the circuit breaker support plate 23. One end of the bellows 22 is connected to the circuit breaker operating mechanism 21, and the other end is connected to the single pole 24. The entire circuit breaker unit 2 is fixed to the sealed housing 1 through the circuit breaker support plate 23. A sealing ring is installed between the circuit breaker support plate 23 and the sealed housing 1 to ensure airtightness.

[0033] The single-pole unit 24 includes a single-pole bracket 241, an insulating tie rod 242, a rear outlet base 243, a conductive clamp 244, a vacuum bulb 245, a circuit breaker support rod 246, and a front outlet base 247. The single-pole unit is fixedly connected to the circuit breaker support plate 23 via the single-pole bracket. The insulating tie rod 242 is connected to the vacuum bulb 245 via the conductive clamp 244. The rear outlet base 243 is mounted on the single-pole bracket 241. The circuit breaker support rod is fixedly connected to the rear outlet base 243 and extends in the opening and closing direction. The vacuum bulb 245 is fixed between the front and rear outlet bases 243 via the circuit breaker support rod 246. The single-pole bracket 241 is made of epoxy resin casting, and the circuit breaker support rod 246 is made of high-performance insulating material.

[0034] Three-position switch unit such as Figure 6 As shown, the device includes a three-position switch operating mechanism, a switch support plate 32, a grounding contact 33, a transmission screw 34, an intermediate stationary contact 35, a moving contact 36, an isolating stationary contact 37, and a switch support rod 38. The three-position switch operating mechanism is mounted on the outer surface of the switch support plate 32, and the grounding contact 33 is mounted on the inner surface of the switch support plate 32. The switch support rod 38 is fixedly connected to the inner surface of the switch support plate 32. The switch support rod 38 is made of high-performance insulating material and is divided into multiple groups in the opening and closing direction, connected by an intermediate connecting plate. The intermediate stationary contact 35 and the isolating stationary contact 37 are both fixedly connected to the switch support rod 38. The left end of the transmission screw 34 is connected to the three-position switch operating mechanism, and the right end is connected to the moving contact 36. During operation, the three-position switch operating mechanism drives the transmission screw 34 to rotate, thereby moving the moving contact 36 to realize the isolation of the isolating switch unit 3 and the opening and closing of the grounding switch.

[0035] With the structural setup and layout described above, in this embodiment, when the relative pressure inside the sealed enclosure 1 is 0.04 MPa, the center distance of the three-phase circuit breaker unit 2 can be reduced to 215 mm, and the size of the sealed enclosure 1 can be reduced to 790 mm × 760 mm × 840 mm (length × width × height). Overall, the combined switch has high breaking reliability while occupying less space and has lower maintenance costs.

[0036] The prefabricated substation of the present invention is not limited to the embodiments described above. Other modified embodiments based on the design concept of the present invention are also provided below.

[0037] For example, in other embodiments, unlike the arrangement of the incoming and outgoing bushings in Embodiment 1 described above, when the combined switch is supported and installed using a support frame, the incoming bushing can be set on the top wall of the sealed enclosure, and the outgoing bushing can be set on the bottom wall or vertical side wall of the sealed enclosure; or, in other embodiments, depending on the layout requirements within the prefabricated substation, the incoming and outgoing bushings can both be set on the same vertical side wall, and arranged at intervals between vertically.

[0038] For example, in other embodiments, unlike the arrangement of the three-position switch and circuit breaker in Embodiment 1 described above, the three-position switch and circuit breaker can be spaced apart in the horizontal direction, with the intermediate branch row 6 between them extending horizontally.

[0039] For example, in other embodiments, unlike the installation method of the inlet and outlet bushings in Embodiment 1 described above, the two bushings on the outer side of the three-phase inlet bushing and the three-phase outlet bushing can adopt a bushing structure with a bending section. The bushings are vertically installed on the box wall through the bending section, and the main body of the bushing extends at an angle to the opposite side, without the need for an inclined bushing support.

[0040] The specific embodiment of the gas-filled combination switch for the prefabricated substation of the present invention has the same structure as the gas-filled combination switch in the prefabricated substation described above, and will not be repeated here.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A gas-insulated combination switch for a prefabricated substation, characterized in that, The system includes a sealed enclosure (1) for filling insulating gas. A three-phase main circuit is arranged inside the enclosure (1). Each main circuit includes a three-position switch and a circuit breaker arranged vertically at intervals. The opening and closing directions of the three-position switch and the circuit breaker extend horizontally in the same direction. Inlet and outlet bushings are sealed on the wall of the enclosure (1). The inlet and outlet bushings are connected to the stationary terminals of the three-position switch and the circuit breaker inside the enclosure (1), respectively. An operating module for driving the opening and closing actions of the three-position switch and the circuit breaker is installed on the outside of the enclosure wall of the enclosure (1). The three-position switch and the circuit breaker are installed on the same wall, with the three-position switch above the circuit breaker. A middle branch is set in the space between them. The circuit breaker unit includes a circuit breaker support plate and a single pole. The circuit breaker unit is connected to the sealed enclosure via the circuit breaker support plate. The enclosure is fixed. A single pole includes a single pole bracket, front and rear terminal blocks, a vacuum bulb, and a circuit breaker support rod. The single pole is fixedly connected to the circuit breaker support plate via the single pole bracket. The rear terminal block is mounted on the single pole bracket. The circuit breaker support rod is fixedly connected to the rear terminal block and extends in the opening and closing direction. The vacuum bulb is fixed between the front and rear terminal blocks via the circuit breaker support rod. The three-position switch unit includes a switch support plate, a grounding contact, an intermediate stationary contact, an isolating stationary contact, and a switch support rod. The three-position switch unit is fixed to the sealed enclosure via the switch support plate. The switch support rod and the grounding contact are fixedly connected to the inner side of the switch support plate. The intermediate stationary contact and the isolating stationary contact are both fixedly connected to the switch support rod. The ends of the three-position switch and the ends of the circuit breaker are farther and closer to the opposite side of the enclosure wall, respectively. The intermediate branch is connected to the rear terminal block.

2. The gas-insulated combination switch for prefabricated substations according to claim 1, characterized in that, The incoming bushing (8) is installed on the opposite side wall of the three-position switch and is located diagonally above the three-position switch. The incoming bushing (8) extends horizontally. The space between the top wall of the sealed box (1) and the three-position switch is provided with an incoming branch (7) connecting the three-position switch and the incoming bushing (8).

3. The gas-insulated combination switch for prefabricated substations according to claim 1, characterized in that, The outgoing bushing (4) is installed on the bottom wall of the sealed box (1) and extends downward. The connecting end of the outgoing bushing (4) inside the box extends to the position between the stationary end of the circuit breaker and the opposite side box wall.

4. The gas-insulated combination switch for prefabricated substations according to claim 3, characterized in that, The connection end of the outgoing bushing inside the enclosure is electrically connected to the stationary end of the circuit breaker via an L-shaped outgoing branch.

5. The gas-insulated combination switch for a prefabricated substation according to any one of claims 1-4, characterized in that, Among the three-phase incoming bushings (8) and / or three-phase outgoing bushings (4) arranged at intervals in the same plane, the two on both sides are fixedly installed on the sealed box (1) by bushing brackets (12). The bushing brackets (12) are inclined mounting brackets so that the two bushings extend outward at opposite angles.

6. A prefabricated substation, comprising a prefabricated enclosure, characterized in that, A gas-filled combination switch is fixedly installed inside the enclosure. The gas-filled combination switch includes a sealed enclosure (1) for filling with insulating gas. A three-phase main circuit is arranged inside the sealed enclosure (1). Each main circuit includes a three-position switch and a circuit breaker arranged vertically at intervals. The opening and closing directions of the three-position switch and the circuit breaker are horizontally extended in the same direction. Inlet and outlet bushings are sealed on the wall of the sealed enclosure (1). The inlet and outlet bushings are connected to the stationary terminals of the three-position switch and the circuit breaker inside the sealed enclosure (1). The operating module for driving the opening and closing actions of the three-position switch and the circuit breaker is installed on the outside of the wall of the sealed enclosure (1). The three-position switch and the circuit breaker are installed on the same wall, and the three-position switch is above the circuit breaker. An intermediate branch is set in the space between them. The circuit breaker unit includes a circuit breaker support plate and a single pole. The unit is fixed to the sealed enclosure via a circuit breaker support plate. A single pole includes a single pole bracket, front and rear terminal blocks, a vacuum bulb, and a circuit breaker support rod. The single pole is fixedly connected to the circuit breaker support plate via the single pole bracket. The rear terminal block is mounted on the single pole bracket. The circuit breaker support rod is fixedly connected to the rear terminal block and extends in the opening and closing direction. The vacuum bulb is fixed between the front and rear terminal blocks via the circuit breaker support rod. The three-position switch unit includes a switch support plate, a grounding contact, an intermediate stationary contact, an isolating stationary contact, and a switch support rod. The three-position switch unit is fixed to the sealed enclosure via the switch support plate. The switch support rod and the grounding contact are fixedly connected to the inner side of the switch support plate. The intermediate stationary contact and the isolating stationary contact are both fixedly connected to the switch support rod. The ends of the three-position switch and the ends of the circuit breaker are at opposite distances from the opposite enclosure wall, with the intermediate branch line connected to the rear terminal block.

7. The prefabricated substation according to claim 6, characterized in that, The incoming bushing (8) is installed on the opposite side wall of the three-position switch and is located diagonally above the three-position switch. The incoming bushing (8) extends horizontally. The space between the top wall of the sealed box (1) and the three-position switch is provided with an incoming branch (7) connecting the three-position switch and the incoming bushing (8).

8. The prefabricated substation according to claim 6, characterized in that, The outgoing bushing (4) is installed on the bottom wall of the sealed box (1) and extends downward. The connecting end of the outgoing bushing (4) inside the box extends to the position between the stationary end of the circuit breaker and the opposite side box wall.

9. The prefabricated substation according to claim 8, characterized in that, The connection end of the outgoing bushing inside the enclosure is electrically connected to the stationary end of the circuit breaker via an L-shaped outgoing branch.

10. The prefabricated substation according to any one of claims 6-9, characterized in that, Among the three-phase incoming bushings (8) and / or three-phase outgoing bushings (4) arranged at intervals in the same plane, the two on both sides are fixedly installed on the sealed box (1) by bushing brackets (12). The bushing brackets (12) are inclined mounting brackets so that the two bushings extend outward at opposite angles.

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