Busbar structure for medium frequency power supply cabinet

Abstract

This invention relates to the field of power cabinet busbar technology, specifically a busbar structure for a medium-frequency power cabinet, comprising a housing, a conductor array, and a support assembly. The conductor array is disposed within the housing and includes multiple sets of aluminum busbars arranged in parallel with three phases and three wires. The inner wall of the housing is longitudinally provided with magnetically conductive reinforcing beams. This invention, by using magnetically conductive reinforcing beams made of highly permeable material to partition and store the parallel aluminum busbars, can lock the magnetic field lines of the medium-frequency alternating magnetic field within the magnetically conductive beams, effectively suppressing induced eddy currents in the housing, significantly reducing temperature rise and energy loss under medium-frequency high-power conditions. Simultaneously, the magnetically conductive reinforcing beams also serve as an internal skeleton, providing multi-point rigid support for the aluminum busbar array, enhancing the overall structure's resistance to high-frequency micro-vibrations, and mechanically preventing insulation layer fatigue wear due to vibration, thereby improving the service life and safety performance of the busbar structure.

Description

Technical Field

[0001] This invention relates to the field of power cabinet busbar technology, specifically a busbar structure for medium frequency power cabinets. Background Technology

[0002] Medium frequency power distribution cabinets generally use busbar structures as the core channel for high current transmission. For medium frequency operating conditions of 2kHz to 4kHz, in order to reduce the loss caused by the skin effect and meet the requirements of high current carrying capacity, the busbar system usually adopts a three-phase three-wire parallel structure. That is, each phase is composed of multiple thin aluminum or copper busbars connected in parallel. The outer layer of the multi-row parallel busbar trunking is mostly wrapped with an aluminum-magnesium alloy shell, and the interior is supported and positioned by conventional insulating partitions to achieve a compact layout and achieve the expected protection level.

[0003] However, under the influence of medium-frequency current, the busbar structure of this traditional medium-frequency power supply cabinet generates a high-frequency alternating electromotive force between conductor groups. This causes continuous and high-frequency micro-vibrations in the parallel thin conductors. These high-frequency micro-vibrations, acting on the conductor insulation layer over a long period, easily lead to mechanical fatigue wear of the insulation material, thereby reducing insulation resistance, shortening equipment lifespan, and even causing breakdown accidents. Furthermore, the conductors generate enormous heat under medium-frequency conditions, and the outer casing is prone to eddy current losses due to the alternating magnetic field. While traditional enclosed structures can prevent dust and water damage, the internal heat dissipation channels are obstructed, and heat easily accumulates between multiple conductor layers, leading to excessive temperature rise and making it difficult to meet the stringent requirements for long-term stable operation of the busbar under overload current.

[0004] To address the aforementioned issues, existing technologies offer several solutions; for example, increasing the total cross-sectional area of ​​the conductor group or using insulation materials with higher heat resistance ratings to mitigate temperature rise and insulation aging. However, this increases the volume and material cost of the busbar trunking and fails to fundamentally suppress the damage to the insulation layer caused by high-frequency vibrations. Another example is using an integral stamping process to reduce resistance losses at connections. While this solution improves conductivity, the overall dynamic stability of the structure still needs optimization in the face of electromagnetic and mechanical coupling impacts unique to mid-frequency frequencies.

[0005] Therefore, there is an urgent need for a busbar structure for medium-frequency power cabinets that can achieve high current carrying capacity and good shielding, while also possessing active energy dissipation, vibration damping, and efficient heat dissipation capabilities, in order to ensure the efficient, long-life, and safe operation of medium-frequency power distribution systems. Summary of the Invention

[0006] The purpose of this invention is to provide a bus structure for medium-frequency power supply cabinets to solve the problems of significant skin effect, large induced eddy current heating, and difficulty in heat dissipation in the core area caused by the parallel connection of multiple internal conductors when transmitting large currents in existing medium-frequency bus structures.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A busbar structure for a medium-frequency power supply cabinet includes a housing, a conductor array, and a support assembly. The conductor array is disposed within the housing and includes multiple sets of aluminum busbars arranged in parallel with three phases and three wires. The inner wall of the housing is longitudinally provided with magnetically conductive reinforcing beams, and multiple opening slots are formed on both sides of the magnetically conductive reinforcing beams. The magnetically conductive reinforcing beams are made of a high magnetic permeability material. The multiple sets of aluminum busbars are respectively disposed in the opening slots on both sides of the magnetically conductive reinforcing beams. The support assembly includes support members disposed between the sets of aluminum busbars, and the support members are provided with heat dissipation ventilation openings penetrating the upper and lower sides of the support members.

[0008] By incorporating a magnetically permeable reinforcing beam made of high-permeability material on the inner wall of the housing, and using the openings on both sides to embed and partition multiple aluminum busbars, the magnetic field lines generated by the mid-frequency alternating magnetic field can be primarily locked inside the reinforcing beam by the guiding and constraining effect of the high-permeability material on the electromagnetic lines. This effectively reduces the penetration depth of the magnetic field into the aluminum-magnesium alloy housing, thereby significantly suppressing the generation of induced eddy currents in the housing and greatly reducing the temperature rise and energy loss of the system under mid-frequency high-power conditions. Furthermore, by creating heat dissipation vents running through the upper and lower sides of the support components between each group of aluminum busbars, a vertically continuous heat dissipation channel can be constructed between adjacent aluminum busbars. This allows the heat accumulated in the core area of ​​the conductor array due to the skin effect to be conducted to the housing wall through internal air heat circulation, ensuring the long-term stability of the busbar system under rated current and overload current. Furthermore, the limiting relationship between the opening slot and the aluminum busbar allows the magnetic reinforcing beam to not only perform electromagnetic shielding but also act as an internal skeleton to provide multi-point rigid support for the aluminum busbar array. This greatly enhances the overall structure's resistance to micro-vibrations when subjected to high-frequency alternating electromotive force impacts, mechanically preventing insulation layer fatigue wear caused by high-frequency vibrations and effectively improving the service life and safety performance of the busbar structure.

[0009] Preferably, the support member has an internal mounting cavity, and an elastic clamping member is embedded in the mounting cavity. The elastic clamping member is used to apply a lateral preload to the aluminum busbar. By creating an installation cavity within the support component and embedding an elastic clamping element, the continuous lateral preload generated by the elastic clamping element ensures that multiple parallel aluminum busbars maintain a compact stacked state, effectively counteracting the mechanical vibration tendency caused by the alternating electromotive force generated by the medium-frequency current. Furthermore, the elastic clamping element dynamically compensates for changes in physical gaps caused by thermal expansion and contraction during long-term operation, ensuring contact stability between the conductor array and the support component, and structurally preventing partial discharge or abnormal noise problems caused by fastening failure. Moreover, the combination of the elastic clamping element and the limiting effect of the support component provides excellent damping and buffering effects when the aluminum busbars are subjected to high-frequency electromotive force impacts. While ensuring electrical connection reliability, it reduces the mechanical compressive stress of the conductor on the insulation layer, thereby further improving the overall dynamic and thermal stability of the busbar system.

[0010] Preferably, the surface of the elastic clamping member is coated with a damping layer, the damping layer is made of a flexible polymer material, and the damping layer is in contact with the insulating surface of the aluminum busbar; By laminating a damping layer made of a flexible polymer material onto the surface of the elastic clamping component and directly bonding it to the insulating surface of the aluminum busbar, the excellent viscoelastic properties of the polymer material can be utilized to efficiently convert the minute mechanical vibration energy generated by the aluminum busbar under the action of medium-frequency alternating electromotive force into minute heat energy, which is then absorbed and dissipated, thereby achieving positive suppression of high-frequency vibration. Furthermore, the presence of the damping layer alters the rigid contact interface between the elastic clamping component and the aluminum busbar, effectively alleviating local stress concentration on the insulating coating of the aluminum busbar while simultaneously transmitting the pre-tightening force. Moreover, the synergistic effect of the damping layer's active energy dissipation and the lateral pre-tightening effect of the elastic clamping component not only fundamentally avoids mechanical fatigue wear of the insulating material under high-frequency micro-vibration environments, ensuring long-term stability of insulation performance, but also reduces structural noise of the busbar system during operation by absorbing vibration, achieving dual technical gains of electrical insulation protection and dynamic stability optimization.

[0011] Preferably, the elastic clamping member is asymmetrically wave-shaped, and the crest of the elastic clamping member forms an asymmetrical point contact with the sidewall of the aluminum busbar. The gap between the elastic clamping member and the aluminum busbar is connected to the heat dissipation vent. By designing the elastic clamping component as an asymmetrical wave shape and utilizing its crests to form an asymmetrical point contact with the aluminum busbar sidewall, the resonant frequency easily generated by the conductor array under medium-frequency and high-frequency alternating magnetic field environments can be effectively broken. The asymmetry of the physical structure actively suppresses the resonance effect, further enhancing the dynamic stability of the busbar system. Furthermore, by interconnecting the physical gap between the elastic clamping component and the aluminum busbar, as well as the heat dissipation vents on the support components, a crisscrossing heat dissipation grid is constructed inside the busbar, extending directly from the conductor's heat source to the shell. This allows the heat emitted by the conductor array to quickly flow into the heat dissipation vents and shell through the gaps formed by the asymmetrical point contact. Moreover, the synergistic effect of the asymmetrical point contact structure and the multi-stage flow channel connection not only minimizes the shielding area of ​​the support components on the conductor's heat dissipation surface while ensuring mechanical preload, but also enhances heat transfer efficiency through the turbulence effect of airflow in the asymmetrical gaps. This ensures that the core heat of the conductor can be efficiently extracted and dissipated under medium-frequency overload current conditions, significantly improving the overall heat dissipation performance and operational safety of the busbar structure. By setting longitudinally penetrating flow holes on the surface of the elastic clamping component, the originally closed mounting cavity and the gap between the elastic clamping component and the aluminum busbar are transformed into dynamic ventilation corridors, thereby solving the shielding effect of the elastic clamping component on the heat dissipation surface of the aluminum busbar. Furthermore, the flow holes are interconnected with the heat dissipation vents on the support component, constructing a crisscrossing three-dimensional heat dissipation grid within the support component. This allows the mid-frequency induced heat to be rapidly drawn away along multi-dimensional paths, reducing the thermal mass of the clamping component itself while maintaining the necessary lateral preload. Combined with the asymmetric wave structure to induce micro-turbulence in the airflow, this significantly improves the heat exchange efficiency of the core area of ​​the busbar under mid-frequency overload conditions.

[0012] Preferably, the inner wall of the opening groove is provided with a longitudinally arranged guide rail, and the outer edge of the support member is provided with a guide groove that slides with the guide rail; By setting longitudinal guide rails on the inner wall of the slot in the magnetic reinforcing beam, and forming a sliding fit structure with the guide groove on the outer edge of the support, precise axial assembly guidance can be provided for the support, realizing rapid and high-precision positioning and assembly between the conductor array and the magnetic skeleton. Furthermore, the sliding fit between the guide rails and guide grooves allows the support to undergo slight displacement compensation along the axial direction of the magnetic reinforcing beam when the busbar operates and experiences thermal expansion and contraction, effectively avoiding internal stress accumulation caused by rigid fixing and preventing thermal deformation or cracking of the support structure. Moreover, the sliding connection between the guide rails and guide grooves not only enhances the mechanical connection strength between the support and the magnetic reinforcing beam, but also allows the heat dissipated by the aluminum busbar to be more directly conducted to the magnetic skeleton with a large heat capacity for secondary heat dissipation through the guide rail contact interface, improving the overall stiffness of the busbar system when subjected to lateral impacts from high-frequency electromotive force, and ensuring the spatial stability of internal components under medium-frequency high-current conditions.

[0013] Preferably, the lower end of the housing is provided with a three-way connecting cover, and the three-way connecting cover is provided with a down-leading branch, which is composed of multiple conductive rods of the same physical length; By installing a T-junction cover at the lower end of the housing and combining it with a downleading branch composed of multiple conductive rods of equal physical length, an electrical channel for current distribution to the equipment inside the cabinet can be provided for the busbar system, enabling flexible connection between the busbar trunking and the internal components of the power cabinet. Furthermore, the equal-length design of the downleading branch ensures that the AC impedance of each conductive rod tends to be consistent when transmitting medium-frequency current. This solves the technical problem of uneven current distribution in parallel branches due to spatial differences from a mechanical layout perspective, effectively preventing abnormal heating caused by overload in local conductive rods. Moreover, the physical protection provided by the T-junction cover to the downleading branch is interconnected with the current-sharing effect generated by the equal-length conductive rods. This not only improves the protection level and dynamic and thermal stability of the downleading part but also ensures the electromagnetic characteristics are balanced during the shunting process of large medium-frequency current, significantly enhancing the operational reliability of the entire medium-frequency power distribution system.

[0014] Preferably, the interior of the three-way connector cover and the housing is provided with an electromagnetic shielding cover, and the electromagnetic shielding cover is electrically equipotentially connected to the housing through a woven grounding strip; By adding an electromagnetic shielding cover inside the T-junction and housing, and using a braided grounding strip to electrically equipotentially connect it to the outer housing, the induced charge can be rapidly guided to the grounding system using the skin effect when medium-frequency current passes through the T-junction junction. This effectively shields the complex alternating electromagnetic field at the T-junction interface, preventing electromagnetic energy from radiating and leaking to other sensitive electronic components in the power cabinet. Furthermore, the braided grounding strip possesses good flexibility and high-frequency current-carrying capacity, compensating for relative displacement caused by equipment vibration or temperature rise deformation, ensuring that the shielding system always maintains a reliable zero-potential state. Moreover, the physical shielding effect of the electromagnetic shielding cover and the equal-length current-sharing effect of the down-leading branch create a synergistic effect, not only optimizing the electromagnetic environment compatibility of the T-junction branch but also eliminating the risk of floating potential discharge caused by potential difference through equipotential connection, significantly improving the safety boundary and stability of the bus system operating in complex electromagnetic interference environments.

[0015] Preferably, a telescopic compensation joint is provided between the three-way connecting cover and the housing, and the upper and lower ends of the telescopic compensation joint are fixedly connected to the housing and the three-way connecting cover respectively, and a sealing ring is provided at the connection of the three. By installing expansion joints at the connection between the tee connector and the housing, the axial or radial deformation capacity of the expansion joints can absorb and compensate for the mechanical displacement stress caused by thermal expansion and contraction during long-distance laying and high-current operation of the busbar system. This effectively prevents housing cracking or bolt shearing due to thermal stress accumulation. Furthermore, by installing sealing rings at the connection points, a tight seal between the interior of the housing and the external environment is ensured. This achieves physical compensation while maintaining a high standard of protection for the system, preventing dust, moisture, or corrosive gases from entering the busbar. Moreover, the flexible adjustment of the expansion joints and the sealing effect of the sealing rings work synergistically, not only solving the mechanical reliability problem of the intermediate frequency power cabinet under complex temperature differences but also ensuring that the internal electromagnetic shielding cover and the downleading branches are in a clean and stable operating space, significantly extending the overall service life of the busbar system.

[0016] Preferably, the aluminum busbar is covered with multiple layers of composite insulation, and the multiple layers of composite insulation include, from the inside out, a polyester film layer and a 3M tape encapsulation layer. By setting a polyester film layer and a 3M tape encapsulation layer distributed sequentially from the inside to the outside of the aluminum busbar, the excellent dielectric strength and heat resistance of the polyester film can provide a basic high-voltage insulation barrier for the aluminum busbar, effectively preventing the risk of phase-to-phase or phase-to-ground breakdown under medium-frequency high-voltage conditions. Furthermore, the outer 3M tape encapsulation layer not only provides physical fixation and mechanical protection for the inner polyester film, but also utilizes its good sealing properties and chemical stability to isolate the insulation system from the erosion of moisture and impurities in the external environment. Moreover, the multi-layer composite insulation layer's multi-composite structure, along with the aforementioned elastic clamping element, allows the insulation layer to maintain a tight wrapping state while withstanding high-frequency micro-vibration stress. This not only significantly enhances the insulation reliability of the busbar system under harsh operating conditions, but also, through material optimization, ensures that the insulation strength of the busbar system does not degrade under long-term high-temperature operation, greatly improving the overall safe lifespan of the medium-frequency power distribution equipment.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention uses magnetically conductive reinforcing beams made of high-permeability material to partition and store parallel aluminum busbars. This can lock the magnetic field lines of the medium-frequency alternating magnetic field inside the magnetically conductive beams, effectively suppressing the generation of induced eddy currents in the shell, and significantly reducing the temperature rise and energy loss under medium-frequency high-power conditions. At the same time, the magnetically conductive reinforcing beams can also serve as an internal skeleton to form multi-point rigid support for the aluminum busbar array, enhancing the overall structure's ability to resist high-frequency micro-vibrations. From a mechanical perspective, this avoids the insulation layer from fatigue wear due to vibration, thereby improving the service life and safety performance of the busbar structure.

[0018] 2. This invention constructs a vertically continuous internal heat dissipation channel by setting up support members with heat dissipation vents between adjacent aluminum busbars. This allows the heat accumulated in the core area of ​​the conductor array due to the skin effect to be quickly conducted to the shell wall through internal air heat circulation. At the same time, the gaps formed by the asymmetric wave-shaped elastic clamping members are connected to the heat dissipation vents, constructing a crisscrossing internal heat dissipation grid. This not only reduces the shading of the heat dissipation surface by the support members, but also enhances the heat exchange efficiency by utilizing the turbulence effect, ensuring the stability of the busbar system under rated and overload current.

[0019] 3. This invention, by embedding an elastic clamping component with a polymer damping layer inside the support, can apply a continuous lateral preload to the aluminum busbar, counteracting the vibration tendency caused by alternating electromotive force and dynamically compensating for gap changes caused by thermal expansion and contraction. It can also convert vibration energy into heat energy dissipation through the viscoelastic properties of the damping layer, breaking the resonant frequency and suppressing the resonance effect, thus preventing fatigue wear of the insulation layer from the root cause. At the same time, it can alleviate stress concentration, reduce structural noise, and achieve the dual benefits of electrical insulation protection and dynamic stability optimization.

[0020] 4. This invention, by adding a down-leading branch composed of an equal-length conductive rod at the T-junction, combined with the internal electromagnetic shielding protective cover and telescopic compensation structure, not only ensures the consistency of AC impedance of the parallel branch circuits and avoids local overload heating, but also effectively shields the electromagnetic leakage at the junction, compensates for the displacement stress caused by thermal expansion and contraction, maintains the system protection level, eliminates the risk of floating potential discharge, and greatly improves the operational reliability and environmental adaptability of the entire medium frequency power distribution system. Attached Figure Description

[0021] Figure 1 This is an overall schematic diagram of the busbar structure for the intermediate frequency power supply cabinet of the present invention; Figure 2 for Figure 1 Full sectional view at point AA; Figure 3 for Figure 2 A magnified view of a section at point B in the middle; Figure 4 for Figure 2 Full sectional view at point CC; Figure 5 for Figure 4 A magnified view of a section at point D; Figure 6 for Figure 4 Full sectional view at EE; Figure 7 This is a schematic diagram of the support structure in this invention.

[0022] In the diagram: 1. Shell; 2. Magnetic reinforcing beam; 2a. Vertical section; 2b. Horizontal section; 2c. Opening slot; 3. Aluminum busbar; 3a. Phase A conductive busbar; 3b. Phase B conductive busbar; 3c. Phase C conductive busbar; 4. Support component; 4a. Mounting cavity; 4b. Guide groove; 5. Heat dissipation and ventilation opening; 6. Elastic clamping component; 6a. Damping layer; 6b. Flow hole; 7. Guide rail; 8. Downward branch; 9. Electromagnetic shielding cover; 10. Braided grounding strip; 11. Expansion joint; 12. Composite insulation layer; 12a. Polyester film layer; 12b. 3M tape encapsulation layer; 13. T-junction cover. Detailed Implementation

[0023] Please see Figures 1 to 7 This invention provides a busbar structure for a medium-frequency power supply cabinet, the technical solution of which is as follows: For a busbar structure used in a medium-frequency power supply cabinet, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 4The system includes a housing 1, a conductor array, and a support assembly. The housing 1 is made of aluminum-magnesium alloy. The conductor array is located inside the housing 1 and includes nine groups of aluminum busbars 3 arranged in a three-phase, three-wire parallel configuration. The aluminum busbars 3 are covered with a multi-layer composite insulation layer 12. The multi-layer composite insulation layer 12 includes, from the inside out, a polyester film layer 12a and a 3M tape encapsulation layer 12b. The nine groups of aluminum busbars 3 are equidistantly distributed. The aluminum busbars 3 include A-phase conductors 3a, B-phase conductors 3b, and C-phase conductors 3c. The arrangement order of the three groups of aluminum busbars 3 at the same height is as follows, from front to back: First group: A-phase conductors 3a, C-phase conductors 3c, B-phase conductors 3b; Second group: B-phase conductors 3b, A-phase conductors 3a, C-phase conductors 3c; Third group: C-phase conductors 3c, B-phase conductors 3b, A-phase conductors 3a. The arrangement order of the three groups of aluminum busbars 3 in the same vertical direction is the same. This allows the alternating magnetic fields generated by the three-phase aluminum busbars 3 to cancel each other out in space, significantly reducing the additional losses caused by proximity effects. At the same time, it optimizes the overall electromagnetic distribution, effectively avoiding the additional heat generated by excessive concentration of local magnetic fields, and improving the transmission efficiency and operational stability of the entire busbar structure under medium-frequency high-current conditions. The inner wall of the housing 1 is longitudinally provided with a magnetically conductive reinforcing beam 2, which includes a vertical part 2a and multiple horizontal parts 2b. The vertical part 2a is at the same height as the interior of the housing 1, and the multiple horizontal parts 2b are located on the front and rear sides of the vertical part. An opening slot 2c is formed between two horizontal parts 2b. The magnetically conductive reinforcing beam 2 is made of silicon steel and is made of multiple layers of thin silicon steel stacked together. Multiple sets of aluminum busbars 3 are respectively located in the opening slots 2c on both sides of the magnetically conductive reinforcing beam 2. The support assembly includes a support member 4, which is located between each set of aluminum busbars 3. The support member 4 is provided with heat dissipation ventilation holes 5 that penetrate the upper and lower sides of the support member 4.

[0024] For further details, please refer to Figures 4 to 7 The support member 4 has an internal mounting cavity 4a, in which an elastic clamping member 6 is embedded. The elastic clamping member 6 is used to apply a lateral preload to the aluminum busbar 3. The surface of the elastic clamping member 6 is coated with a damping layer 6a, which is made of a flexible polymer material and is in contact with the insulating surface of the aluminum busbar 3. The elastic clamping member 6 is asymmetrically wave-shaped, and the crest of the elastic clamping member 6 forms an asymmetrical point contact with the side wall of the aluminum busbar 3. The gap between the elastic clamping member 6 and the aluminum busbar 3 is connected to the heat dissipation vent 5. The elastic clamping member 6 has a longitudinally penetrating flow hole 6b, which is interconnected with the heat dissipation vent 5 on the support member 4, thus constructing a crisscrossing three-dimensional heat dissipation grid on the support member 4. The inner side wall of the opening slot 2c is provided with a longitudinally arranged guide rail 7, and the outer edge of the support member 4 is provided with a guide groove 4b that slides with the guide rail 7.

[0025] For further details, please refer to Figure 2 and Figure 3The lower end of the housing 1 is provided with a three-way connecting cover 13. Inside the three-way connecting cover 13 are three down-leading branches 8, each corresponding to one of the three phases. Each down-leading branch 8 is composed of multiple conductive rods of the same physical length. It should be noted that the conductor busbars and conductive rods of each phase are integrally stamped. The interior of the three-way connecting cover 13 and the housing 1 is provided with an electromagnetic shielding cover 9. The electromagnetic shielding cover 9 is electrically equipotentially connected to the housing 1 through a braided grounding strip 10. An expansion joint 11 is provided between the three-way connecting cover 13 and the housing 1. The upper and lower ends of the expansion joint 11 are fixedly connected to the housing 1 and the three-way connecting cover 13, respectively, and sealing rings are provided at the connection points of the three. Working principle: Please refer to Figures 1 to 7 During operation, the nine aluminum busbars 3 are arranged in a three-phase staggered manner to cancel each other out in space, significantly reducing proximity effects and eddy current losses. The magnetically reinforcing beam 2, made of high-permeability material, locks the remaining magnetic lines of force inside itself, preventing the shell 1 from inducing eddy currents that would generate additional losses and temperature rise. At the same time, it provides stable rigid support for the aluminum busbar array 3, suppressing the overall vibration caused by the intermediate frequency alternating electromotive force. The support members 4 between adjacent aluminum busbars 3 form a vertically continuous heat dissipation channel through their own heat dissipation vents 5. Combined with the connecting gap formed by the embedded asymmetric wave-shaped elastic clamping member 6, an internal heat dissipation grid is constructed. This not only reduces the shading of the heat dissipation surface of the aluminum busbars 3 by the support members, but also enhances the heat transfer efficiency by utilizing the turbulence generated by the airflow in the asymmetric gap, quickly conducting the heat accumulated in the core area of ​​the aluminum busbars 3 to the shell 1 for outward dissipation. The elastic clamping component 6 continuously applies a lateral preload to the aluminum busbar 3, which can not only counteract the vibration trend caused by the alternating electromotive force and dynamically compensate for the gap changes caused by the thermal expansion and contraction of the aluminum busbar 3, but also convert vibration energy into heat energy dissipation through the surface composite polymer damping layer 6a, suppress the resonance effect, avoid fatigue wear of the insulation layer due to vibration, and at the same time alleviate stress concentration and reduce structural operating noise. During current shunting and transfer, the down-leading branch 8, composed of conductive rods of equal length, ensures that the AC impedance of each conductive rod is consistent, avoiding local overload heating caused by uneven distribution of branch current. The internal electromagnetic shielding cover 9 achieves equipotential connection with the shell 1 through the braided grounding strip 10, which can quickly guide the induced charge to the grounding system, shield the leakage of alternating electromagnetic field radiation, and eliminate the risk of floating potential discharge. The expansion joint 11 between the three-way connecting cover 13 and the shell 1 can absorb and compensate for the displacement stress caused by the thermal expansion and contraction of the busbar. With the sealing ring at the connection, it maintains the system protection level while compensating for stress, preventing external impurities from entering the interior, and ultimately achieving low loss, low heat rise, and high stability operation of the medium frequency power cabinet busbar.

[0026] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A busbar structure for an intermediate frequency power cabinet, characterized by, The device includes a housing (1), a conductor array, and a support assembly. The conductor array is disposed inside the housing (1). The conductor array includes multiple sets of aluminum bars (3) arranged in parallel with three phases and three wires. The inner wall of the housing (1) is longitudinally provided with a magnetic reinforcing beam (2). Multiple opening slots (2c) are provided on both sides of the magnetic reinforcing beam (2). The magnetic reinforcing beam (2) is made of a high magnetic permeability material. The multiple sets of aluminum bars (3) are respectively disposed in the opening slots (2c) on both sides of the magnetic reinforcing beam (2). The support assembly includes a support member (4). The support member (4) is disposed between each set of aluminum bars (3). The support member (4) is provided with heat dissipation ventilation openings (5) that penetrate the upper and lower sides of the support member (4).

2. The busbar structure for an intermediate frequency power cabinet according to claim 1, wherein, The support member (4) has an installation cavity (4a) inside, and an elastic clamping member (6) is embedded in the installation cavity (4a). The elastic clamping member (6) is used to apply a lateral preload to the aluminum strip (3).

3. The busbar structure for an intermediate frequency power cabinet according to claim 2, wherein, The surface of the elastic clamping member (6) is coated with a damping layer (6a), which is made of a flexible polymer material and is in contact with the insulating surface of the aluminum busbar (3).

4. The busbar structure for an intermediate frequency power cabinet according to claim 3, wherein, The elastic clamping member (6) is asymmetrically wave-shaped. The crest of the elastic clamping member (6) forms an asymmetrical point contact with the side wall of the aluminum busbar (3). The gap between the elastic clamping member (6) and the aluminum busbar (3) is connected to the heat dissipation vent (5). The elastic clamping member (6) is provided with a longitudinally penetrating flow hole (6b).

5. A busbar structure for a medium-frequency power supply cabinet according to claim 1, characterized in that, The inner wall of the opening groove (2c) is provided with a longitudinally arranged guide rail (7), and the outer edge of the support member (4) is provided with a guide groove (4b) that slides with the guide rail (7).

6. The busbar structure for an intermediate frequency power cabinet according to claim 1, wherein, The lower end of the housing (1) is provided with a three-way connecting cover (13), and the three-way connecting cover (13) is provided with a down-leading branch (8), which is composed of multiple conductive rods of the same physical length.

7. The busbar structure for an intermediate frequency power cabinet according to claim 6, wherein The interior of the three-way connecting cover (13) and the housing (1) is provided with an electromagnetic shielding cover (9), and the electromagnetic shielding cover (9) is electrically connected to the housing (1) through a braided grounding strip (10).

8. The busbar structure for an intermediate frequency power cabinet according to claim 7, wherein, A telescopic compensation joint (11) is provided between the three-way connecting cover (13) and the housing (1). The upper and lower ends of the telescopic compensation joint (11) are fixedly connected to the housing (1) and the three-way connecting cover (13) respectively, and a sealing ring is provided at the connection of the three.

9. The busbar structure for an intermediate frequency power cabinet according to claim 1, wherein, The aluminum busbar (3) is covered with a multi-layer composite insulation layer (12), which includes a polyester film layer (12a) and a 3M tape encapsulation layer (12b) from the inside out.

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