Intelligent transformer with impact protection

Abstract

The application discloses an anti-impact protection intelligent transformer and particularly relates to the technical field of transformers, comprising a reinforcing frame, wherein a protection assembly is arranged on the reinforcing frame; the assembly comprises a transformer shell arranged on the reinforcing frame; a reinforcing net frame seat for protection is embedded in the transformer shell; and clamping seats are fixedly arranged on the top of the reinforcing net frame seat on both sides. The application can effectively reduce the damage of impact force to the structure in the reinforcing net frame seat by first deforming the energy-absorbing arc plate to release force; the elastic bag and non-Newtonian fluid in the energy-absorbing cavity can effectively reduce the damage of impact force to the structure in the reinforcing net frame seat; the winding spacing on each iron core cylinder is adjusted to realize the homogenization of the electric field; increasing the winding spacing can reduce the electric field gradient, reduce the risk of partial discharge and insulation breakdown, and the magnetic field distribution can be optimized by adjusting the spacing between the connecting frames on a single iron core cylinder, thereby reducing the eddy current loss and improving long-term reliability.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more specifically, to an intelligent transformer with impact protection. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary coil, secondary coil, and iron core (magnetic core). Its main functions include voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer). Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, and CNC machinery. Simply put, a dry-type transformer is a transformer whose iron core and windings are not immersed in insulating oil.

[0003] Among them, the patent with announcement number CN220873352U discloses an impact-resistant dry-type transformer, which relates to the field of dry-type transformer technology. It includes a dry-type transformer body, a support mechanism at the lower end of the dry-type transformer body, and anti-collision protection mechanisms on both outer surfaces of the dry-type transformer body.

[0004] In use, this structure provides initial protection to the outer side of the dry-type transformer body through the cooperation of the triangular plate and the retaining groove plate. When the arc-shaped stop is subjected to external impact force, the movable block 1 is displaced and squeezes the buffer spring 1. The buffer spring 1 is compressed, and the hydraulic rod 1 is deformed. The elastic force of the buffer spring 1 buffers the impact force of the external force, reducing the impact force on the transformer. However, after the buffer spring is compressed and rebounds, it will drive the arc-shaped stop, triangular plate and retaining groove plate to reset and rebound. This results in poor protection effect and damage to the internal iron core and windings. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an impact-resistant intelligent transformer, which aims to solve the problems mentioned in the background art.

[0006] This invention provides the following technical solution: an intelligent transformer with impact protection, including a reinforcing frame, on which protective components are provided;

[0007] The protective assembly includes a transformer housing mounted on a reinforcing frame. A reinforcing mesh frame base for protection is embedded inside the transformer housing. A snap-fit ​​seat is fixedly mounted on both sides of the top of the reinforcing mesh frame base, and an energy-absorbing arc plate is snapped into each snap-fit ​​seat. The bottom of the energy-absorbing arc plate extends to one side of the bottom of the reinforcing mesh frame base. A reinforcing abutment is fixedly mounted at the bottom of each of the two energy-absorbing arc plates, and the bottom end of each reinforcing abutment extends to the bottom of the inner wall of the transformer housing and snaps into the transformer housing.

[0008] The reinforcing mesh frame base has an installation cavity, in which several iron core cylinders are stacked. Several angle-adjustable connecting frames are rotatably connected to the iron core cylinders. Each of the connecting frames has a through-hole, and a winding is embedded in each of the installation holes. A terminal block is bolted to the top of the transformer housing. A circuit breaker is bolted to the top of the reinforcing frame. The circuit breaker has several connectors, and each circuit breaker is connected to the terminal block via wires. Energy absorption cavities extending to the bottom of the reinforcing mesh frame base are opened on both sides of the top. An elastic bag is provided in the energy absorption cavity. A non-Newtonian fluid is provided in the elastic bag, and the non-Newtonian fluid is filled with high thermal conductivity particles.

[0009] As can be seen, in the above technical solution, the transformer shell deforms under force and squeezes the energy-absorbing arc plate. When the energy-absorbing arc plate deforms, it drives the reinforcing rod to move downward and press against the transformer shell. By dissipating the force through the deformation of the energy-absorbing arc plate first, the damage caused by the impact force to the internal structure of the reinforcing mesh frame can be effectively reduced. When the impact force is transmitted to the reinforcing mesh frame, the elastic bag and non-Newtonian fluid in the energy-absorbing cavity absorb energy, and its viscosity increases sharply. Under the impact force, a temporary rigid network structure is formed due to the friction and collision between particles, which can effectively reduce the damage caused by the impact force to the internal structure of the reinforcing mesh frame. At the same time, the high thermal conductivity particles filled in the non-Newtonian fluid can also facilitate the heat dissipation of the heat generated by the transformer during operation.

[0010] Optionally, in a possible implementation, a nylon plate is provided on one side of the inner wall of the mounting cavity, a traction plate is slidably connected to the nylon plate, and a plurality of sliding plates are provided between the traction plate and the nylon plate. A connecting rod is bolted to one end of both the traction plate and the sliding plates, and each connecting rod extends to the top of the iron core cylinder. A servo motor is fixedly mounted on the iron core cylinder by bolts at the end of each connecting rod. A folding rod is rotatably connected to the side of both the sliding plates and the traction plate away from the connecting rod, and one end of the folding rod extends to the nylon plate and is rotatably connected to it. An electric push rod for driving the displacement of the traction plate is installed on the outer side of the duct plate by bolts. A turntable is provided at the output end of the servo motor. The turntable is located inside the iron core cylinder, and a limit cylinder is rotatably connected to the outer side of the turntable. The limit cylinder is connected to the iron core cylinder by bolts. Several first hinge members are hinged to the outer side of the turntable, and one end of each second hinge member is connected to a second hinge member. A rotating shaft is fixedly provided on the second hinge member. One end of the rotating shaft extends to the limit cylinder and is rotatably connected to the limit cylinder. The other end of the rotating shaft passes through the iron core cylinder and extends to the connecting frame.

[0011] As can be seen, in the above technical solution, the function of adjusting the position between each slide and connecting rod is achieved by the connecting rod moving to drive the servo motor and the iron core cylinder to move, thereby adjusting the winding spacing on each iron core cylinder, achieving electric field homogenization, increasing the winding spacing can reduce the electric field gradient, and reduce the risk of partial discharge and insulation breakdown. At the same time, the servo motor drives the turntable to rotate, and the rotation of the turntable drives the first hinge to deflect, which in turn allows the second hinge to drive the rotating shaft to rotate on the surface of the limiting cylinder, thereby adjusting the spacing and angle of each pair of adjacent connecting frames and windings on the outer side of each iron core cylinder, promoting the flow of cooling medium (air), improving convection heat dissipation efficiency, and by adjusting the spacing of the connecting frames on a single iron core cylinder, the magnetic field distribution can be optimized, eddy current loss can be reduced, and long-term reliability can be improved.

[0012] The technical effects and advantages of this invention are as follows:

[0013] 1. The reinforcing frame of this invention first protects the transformer shell and the structure inside the transformer shell. When the device is impacted, the transformer shell deforms under force and squeezes the energy-absorbing arc plate. When the energy-absorbing arc plate absorbs energy and deforms, it will drive the reinforcing rod to move downward and press against the transformer shell. By dissipating the force through the deformation of the energy-absorbing arc plate first, the impact force can be effectively reduced to reduce the damage to the internal structure of the reinforcing mesh frame.

[0014] 2. When the impact force is transmitted to the reinforcing mesh frame seat, the elastic bag and non-Newtonian fluid in the energy absorption cavity absorb energy, and their viscosity increases sharply. Under the impact force, a temporary rigid network structure is formed due to the friction and collision between particles, which can effectively reduce the damage caused by the impact force to the internal structure of the reinforcing mesh frame seat. At the same time, the high thermal conductivity particles filled in the non-Newtonian fluid can also facilitate the heat dissipation of the heat generated by the transformer during operation.

[0015] 3. This invention unfolds the folding rod through the traction force of the traction plate displacement, thereby adjusting the position between each slide and the connecting rod. When the connecting rod is displaced, it drives the servo motor and the iron core cylinder to move, thereby adjusting the winding spacing on each iron core cylinder, achieving electric field homogenization. Increasing the winding spacing can reduce the electric field gradient and reduce the risk of partial discharge and insulation breakdown.

[0016] 4. The present invention drives the first hinge to deflect when the turntable rotates, which in turn enables the second hinge to drive the rotating shaft to rotate on the surface of the limiting cylinder. This achieves the function of adjusting the spacing and angle of each pair of adjacent connecting frames and windings on the outside of each iron core cylinder, promoting the flow of cooling medium (air), improving convective heat dissipation efficiency, and by adjusting the spacing of connecting frames on a single iron core cylinder, the magnetic field distribution can be optimized, eddy current loss can be reduced, and long-term reliability can be improved.

[0017] In summary, through the coordinated use of various structures, the energy-absorbing arc plate, upon energy absorption and deformation, drives the reinforcing rod to move downwards and press against the transformer housing. The energy-absorbing arc plate's initial deformation effectively reduces the impact force on the internal structure of the reinforcing frame. The elastic bags and non-Newtonian fluid within the energy-absorbing cavity further mitigate the impact damage. Simultaneously, the highly thermally conductive particles filling the non-Newtonian fluid facilitate heat conduction and dissipation of the heat generated during transformer operation. The displacement of the connecting rod drives the servo motor and core cylinder, adjusting the winding spacing on each core cylinder to achieve electric field homogenization. Increasing the winding spacing reduces the electric field gradient, decreasing the risk of partial discharge and insulation breakdown. Adjusting the spacing and angle of adjacent connecting frames and windings on the outer side of the core cylinder promotes the flow of cooling medium (air), improving convective heat dissipation efficiency. Furthermore, adjusting the spacing of connecting frames on a single core cylinder optimizes the magnetic field distribution, reduces eddy current losses, and enhances long-term reliability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0019] Figure 1 This is a front view of the overall structure of the present invention.

[0020] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0021] Figure 3 This is a schematic diagram showing the installation of the reinforcing mesh frame base, energy-absorbing arc plate, reinforcing rod, and energy-absorbing cavity together according to the present invention.

[0022] Figure 4 This is a side view of the nylon sheet electric push rod, traction plate, sliding plate, folding rod, and connecting rod of the present invention.

[0023] Figure 5 This is a perspective view of the iron core cylinder, servo motor, connecting frame, and winding of the present invention.

[0024] Figure 6 This is a schematic diagram of the connecting frame, mounting port, and servo motor of the present invention mounted on the iron core cylinder.

[0025] Figure 7 This is a schematic diagram showing the installation of the limiting cylinder, turntable, first hinge, second hinge, and connecting frame of the present invention together.

[0026] The attached figures are labeled as follows: 1. Reinforcing frame; 2. Transformer housing; 3. Reinforcing mesh frame seat; 4. Iron core cylinder; 5. Connecting frame; 6. Mounting port; 7. Winding; 8. Terminal block; 9. Circuit breaker; 10. Connector; 11. Nylon plate; 12. Traction plate; 13. Slide plate; 14. Folding rod; 15. Electric push rod; 16. Connecting rod; 17. Turntable; 18. First hinge; 19. Second hinge; 20. Rotating shaft; 21. Servo motor; 22. Energy absorption cavity; 23. Non-Newtonian fluid; 24. Snap-fit ​​seat; 25. Energy absorption arc plate; 26. Reinforcing abutment; 27. Mounting cavity; 28. Limiting cylinder. Detailed Implementation

[0027] 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.

[0028] As attached Figure 1 - Figure 7 The impact-resistant intelligent transformer shown utilizes protective components on the reinforcing frame 1. When the energy-absorbing arc plate 25 deforms, it drives the reinforcing rod 26 to move downwards and press against the transformer housing 2. The energy-absorbing arc plate 25, by deforming first, dissipates the force, effectively reducing the damage to the internal structure of the reinforcing mesh frame 3 caused by the impact. The elastic bag and non-Newtonian fluid 23 within the energy-absorbing cavity 22 absorb energy, effectively mitigating the damage to the internal structure of the reinforcing mesh frame 3 caused by the impact. Simultaneously, the highly thermally conductive particles filled in the non-Newtonian fluid 23 facilitate the dissipation of heat generated during transformer operation. Conductive heat dissipation: When the connecting rod 16 moves, it drives the servo motor 21 and the iron core cylinder 4 to move, thereby adjusting the spacing of the windings 7 on each iron core cylinder 4, achieving electric field uniformity. Increasing the spacing of the windings 7 can reduce the electric field gradient, reduce the risk of partial discharge and insulation breakdown, and adjust the spacing and angle of each pair of adjacent connecting frames 5 and windings 7 on the outside of the iron core cylinder 4 to promote the flow of cooling medium (air) and improve convective heat dissipation efficiency. Furthermore, by adjusting the spacing of the connecting frames 5 on a single iron core cylinder 4, the magnetic field distribution can be optimized, eddy current losses can be reduced, and long-term reliability can be improved. The specific structural settings of the components are as follows.

[0029] The protective assembly includes a transformer housing 2 mounted on a reinforcing frame 1. A reinforcing mesh frame base 3 for protection is embedded inside the transformer housing 2. A snap-fit ​​seat 24 is fixedly mounted on both sides of the top of the reinforcing mesh frame base 3, and an energy-absorbing arc plate 25 is snapped into each snap-fit ​​seat 24. The bottom of the energy-absorbing arc plate 25 extends to one side of the bottom of the reinforcing mesh frame base 3. A reinforcing abutment 26 is fixedly mounted at the bottom of each of the two energy-absorbing arc plates 25, and the bottom end of each reinforcing abutment 26 extends to the bottom of the inner wall of the transformer housing 2 and snaps into the transformer housing 2.

[0030] The reinforcing mesh frame base 3 has an installation cavity 27, and several iron core cylinders 4 are stacked inside the installation cavity 27. Several angle-adjustable connecting frames 5 are rotatably connected to the iron core cylinders 4. The connecting frames 5 are all provided with an installation port 6, and a winding 7 is embedded in each installation port 6. A terminal block 8 is installed on the top of the transformer housing 2 by bolts. A circuit breaker 9 is installed on the top of the reinforcing frame 1 by bolts. Several connectors 10 are provided on the circuit breaker 9, and each circuit breaker 9 is connected to the terminal block 8 by wires. Energy absorption cavities 22 extending to the bottom of the reinforcing mesh frame base 3 are provided on both sides of the top of the reinforcing mesh frame base 3. An elastic bag is provided in the energy absorption cavity 22, and a non-Newtonian fluid 23 is provided in the elastic bag. The non-Newtonian fluid 23 is filled with high thermal conductivity particles.

[0031] A nylon plate 11 is provided on one side of the inner wall of the mounting cavity 27. A traction plate 12 is slidably connected to the nylon plate 11. Several sliding plates 13 are provided between the traction plate 12 and the nylon plate 11. A connecting rod 16 is bolted to one end of both the traction plate 12 and the sliding plate 13. Each connecting rod 16 extends to the top of the iron core cylinder 4, and a servo motor 21 is fixedly mounted on the iron core cylinder 4 by bolts at the end of the connecting rod 16. A folding rod 14 is rotatably connected to the side of the sliding plate 13 and the traction plate 12 away from the connecting rod 16. One end of the folding rod 14 extends to the nylon plate 11 and is rotatably connected to the nylon plate 11. An electric push rod 15 for driving the displacement of the traction plate 12 is installed on the side by bolts. A turntable 17 is provided at the output end of the servo motor 21. The turntable 17 is located inside the iron core cylinder 4, and a limit cylinder 28 is rotatably connected to the outside of the turntable 17. The limit cylinder 28 is connected to the iron core cylinder 4 by bolts. Several first hinge members 18 are hinged to the outside of the turntable 17, and one end of each second hinge member 19 is connected to a second hinge member 19. A rotating shaft 20 is fixedly provided on the second hinge member 19. One end of the rotating shaft 20 extends to the limit cylinder 28 and is rotatably connected to the limit cylinder 28. The other end of the rotating shaft 20 passes through the iron core cylinder 4 and extends to the connecting frame 5.

[0032] According to the above structure, when in use, the reinforcing frame 1 serves as a support point, and the transformer housing 2 is easily embedded in the middle of the reinforcing frame 1. The reinforcing frame 1 first protects the transformer housing 2 and the structure inside the transformer housing 2. When the device is impacted, the transformer housing 2 deforms under force and squeezes the energy-absorbing arc plate 25. When the energy-absorbing arc plate 25 absorbs energy and deforms, it will drive the reinforcing rod 26 to move downward and press against the transformer housing 2. By dissipating the force through the deformation of the energy-absorbing arc plate 25 first, the impact force can be effectively reduced to reduce the damage to the internal structure of the reinforcing mesh frame base 3.

[0033] Furthermore, when the impact force is transmitted to the reinforcing mesh frame 3, the elastic bag in the energy absorption cavity 22 and the non-Newtonian fluid 23 absorb energy, and their viscosity increases sharply. Under the impact force, a temporary rigid network structure is formed due to the friction and collision between particles, which can effectively reduce the damage caused by the impact force to the internal structure of the reinforcing mesh frame 3. At the same time, the high thermal conductivity particles filled in the non-Newtonian fluid 23 can also facilitate the heat dissipation of the heat generated by the transformer during operation.

[0034] Meanwhile, when the device is in use, the electric push rod 15 drives the traction plate 12 to move on the nylon plate 11, so that the traction force of the folding rod 14 can be unfolded by the displacement of the traction plate 12, thereby adjusting the position between each slide plate 13 and the connecting rod 16. When the connecting rod 16 moves, it drives the servo motor 21 and the iron core cylinder 4 to move, thereby adjusting the spacing of the windings 7 on each iron core cylinder 4, realizing the uniformity of the electric field. Increasing the spacing of the windings 7 can reduce the electric field gradient and reduce the risk of partial discharge and insulation breakdown.

[0035] Simultaneously, the turntable 17 is driven to rotate by the servo motor 21. When the turntable 17 rotates, it causes the first hinge 18 to deflect, which in turn causes the second hinge 19 to drive the rotating shaft 20 to rotate on the surface of the limiting cylinder 28. This realizes the function of adjusting the spacing and angle of each of the two adjacent connecting frames 5 and windings 7 on the outside of the iron core cylinder 4, promoting the flow of cooling medium (air), improving the convective heat dissipation efficiency, and by adjusting the spacing of the connecting frames 5 on a single iron core cylinder 4, the magnetic field distribution can be optimized, eddy current losses can be reduced, and long-term reliability can be improved.

[0036] Unlike existing technologies, this application discloses an intelligent transformer with impact protection. When the energy-absorbing arc plate 25 deforms, it drives the reinforcing rod 26 to move downwards and press against the transformer housing 2. By dissipating force through the initial deformation of the energy-absorbing arc plate 25, the damage caused by the impact to the internal structure of the reinforcing mesh frame 3 can be effectively reduced. The elastic bag and non-Newtonian fluid 23 in the energy-absorbing cavity 22 absorb energy, which can effectively mitigate the damage caused by the impact to the internal structure of the reinforcing mesh frame 3. At the same time, the high thermal conductivity particles filled in the non-Newtonian fluid 23 also facilitate the reduction of energy generated during the operation of the transformer. The heat is conducted away for heat dissipation. When the connecting rod 16 moves, it drives the servo motor 21 and the iron core cylinder 4 to move, thereby adjusting the spacing of the windings 7 on each iron core cylinder 4. This achieves electric field homogenization. Increasing the spacing of the windings 7 can reduce the electric field gradient, thereby reducing the risk of partial discharge and insulation breakdown. The function of adjusting the spacing and angle of each pair of adjacent connecting frames 5 and windings 7 on the outside of the iron core cylinder 4 promotes the flow of cooling medium (air) and improves convective heat dissipation efficiency. Furthermore, by adjusting the spacing of the connecting frames 5 on a single iron core cylinder 4, the magnetic field distribution can be optimized, eddy current losses can be reduced, and long-term reliability can be improved.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An impact-resistant intelligent transformer, including a reinforcing frame (1), characterized in that: The reinforcing frame (1) is equipped with protective components; The protective assembly includes a transformer housing (2) mounted on a reinforcing frame (1). A reinforcing mesh frame base (3) for protection is embedded inside the transformer housing (2). A snap-fit ​​seat (24) is fixedly mounted on both sides of the top of the reinforcing mesh frame base (3), and an energy-absorbing arc plate (25) is snapped into each of the snap-fit ​​seats (24). The bottom of the energy-absorbing arc plate (25) extends to one side of the bottom of the reinforcing mesh frame base (3). The reinforcing mesh frame base (3) has an installation cavity (27), and several iron core cylinders (4) are stacked inside the installation cavity (27). Several angle-adjustable connecting frames (5) are rotatably connected to the iron core cylinders (4). An installation port (6) is opened through the multiple connecting frames (5), and a winding (7) is embedded in each of the installation ports (6). A nylon plate (11) is provided on one side of the inner wall of the mounting cavity (27), and a traction plate (12) is slidably connected on the nylon plate (11). Several sliding plates (13) are provided between the traction plate (12) and the nylon plate (11). One end of the traction plate (12) and the slide plate (13) is bolted with a connecting rod (16), and each connecting rod (16) extends to the top of the iron core cylinder (4), and the end of the connecting rod (16) is fixedly provided with a servo motor (21) bolted to the iron core cylinder (4). The sliding plate (13) and the traction plate (12) are rotatably connected to a folding rod (14) on the side away from the connecting rod (16), and one end of the folding rod (14) extends to the nylon plate (11) and is rotatably connected to the nylon plate (11). An electric push rod (15) for driving the displacement of the traction plate (12) is installed on the outer side of the nylon plate (11) by bolts. The output end of the servo motor (21) is provided with a turntable (17), which is located inside the iron core cylinder (4), and a limit cylinder (28) is rotatably connected to the outside of the turntable (17). The limit cylinder (28) is connected to the iron core cylinder (4) by bolts.

2. The impact-resistant intelligent transformer according to claim 1, characterized in that: A terminal block (8) is bolted to the top of the transformer housing (2), and a circuit breaker (9) is bolted to the top of the reinforcing frame (1). The circuit breaker (9) has several connectors (10), and each circuit breaker (9) is connected to the terminal block (8) by a wire.

3. The impact-resistant intelligent transformer according to claim 1, characterized in that: The turntable (17) has several first hinge members (18) hinged to its outer side, and each of the first hinge members (18) has a second hinge member (19) hinged to one end, and a rotating shaft (20) is fixedly provided on the second hinge member (19).

4. The impact-resistant intelligent transformer according to claim 3, characterized in that: One end of the rotating shaft (20) extends to the limiting cylinder (28) and is rotatably connected to the limiting cylinder (28). The other end of the rotating shaft (20) passes through the iron core cylinder (4) and extends to the connecting frame (5).

5. The impact-resistant intelligent transformer according to claim 1, characterized in that: The top two sides of the reinforcing mesh frame base (3) are provided with energy absorption cavities (22) extending to the bottom of the reinforcing mesh frame base (3), and an elastic bag is provided in the energy absorption cavity (22). The elastic bag is provided with a non-Newtonian fluid (23), and the non-Newtonian fluid (23) is filled with high thermal conductivity particles.

6. The impact-resistant intelligent transformer according to claim 1, characterized in that: The bottom of each of the two energy-absorbing arc plates (25) is fixedly provided with a reinforcing rod (26), and the bottom end of each reinforcing rod (26) extends to the bottom of the inner wall of the transformer housing (2) and is engaged with the transformer housing (2).

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