A power electronic voltage regulator with strong and weak electrical isolation

Abstract

This utility model relates to a power electronic voltage regulating device that isolates strong and weak currents. It includes a cabinet with a partition support plate dividing the space into upper and lower sections. The upper section has a detachable mounting tray at the front for secondary circuits and a converter module at the rear. The lower section houses a circuit breaker, contactor, transformer, and copper busbar assembly. The converter module is detachably connected to the support plate via a rotary positioning and locking mechanism. During high-voltage operation, all components are electrically connected via the copper busbar assembly. The upper sides of the cabinet have waist-shaped ventilation holes, and the bottom has honeycomb ventilation holes. Transformer heat dissipation components are symmetrically installed at the bottom of the side panels. A data communication interface group including wired and wireless interfaces is also provided. This device achieves effective isolation between strong and weak currents, has a compact structure, high heat dissipation efficiency, and is easy to maintain.

Description

Technical Field

[0001] This utility model relates to the field of power electronic equipment technology, specifically to a power electronic voltage regulating device that isolates strong and weak currents. Background Technology

[0002] In the field of power electronic voltage regulation, with the continuous development and increasing complexity of power systems, higher requirements are placed on the performance, reliability, and safety of voltage regulating devices. Traditional power electronic voltage regulating devices have many problems in the arrangement of strong and weak current circuits. For example, the lack of effective isolation between strong and weak current circuits allows electromagnetic interference generated by the strong current section to easily affect the accuracy of control signals in the weak current section, thus affecting the overall performance of the device. At the same time, existing voltage regulating devices also have shortcomings in terms of module installation, heat dissipation, and communication functions. For example, the module installation method is not conducive to flexible adjustment and maintenance, and the heat dissipation structure design is unreasonable and cannot meet the heat dissipation requirements of high-power operation. These problems limit the application of power electronic voltage regulating devices in a wider range of scenarios and further performance improvements. Summary of the Invention

[0003] The purpose of this utility model is to provide a power electronic voltage regulator that isolates strong and weak currents. Through reasonable structural design and module layout, it achieves effective isolation between strong and weak currents, reduces signal interference, and improves the operational reliability of the device. At the same time, it optimizes the module installation method, making installation and maintenance easier. It also designs an efficient heat dissipation structure to meet the heat dissipation requirements of the device when operating at high power.

[0004] To achieve the above objectives, this utility model designs a power electronic voltage regulating device with strong and weak current isolation, including a device cabinet, characterized in that: the device cabinet is equipped with a primary main circuit and a secondary circuit; the primary main circuit includes a converter module, a circuit breaker, a contactor, a transformer, and a copper busbar assembly; the secondary circuit includes an intermediate relay, a terminal block, and a switching power supply; The primary main circuit mainly operates in a high-voltage state and is generally referred to as a high-voltage module, while the secondary circuit mainly operates in a low-voltage state and is generally referred to as a low-voltage module.

[0005] In high-voltage operation, the circuit breaker, contactor, transformer, and converter module are electrically connected via copper busbars, with the specific connection method configured according to the user's circuit functional requirements. In low-voltage operation, the output of the switching power supply is connected to the power interface of the terminal block via a cable, and then connected to the power input terminal of the intermediate relay via the terminal block to provide a stable DC operating voltage for the intermediate relay. The contact pins of the intermediate relay are connected to the signal interface of the terminal block via cables. The contactor control terminal in the primary circuit is electrically connected to the signal output interface of the terminal block in the secondary circuit via a cable. The terminal block acts as a signal relay component, receiving external control signals (such as instructions from the converter module or other control modules) and transmitting them to the coil of the intermediate relay to control the opening and closing of its intermediate contacts. Furthermore, the contact signals of the intermediate relay are relayed through the terminal block to other related components (such as the contactor control terminal of the primary circuit or external monitoring equipment), realizing indirect control and signal feedback from the secondary circuit to the primary circuit. The device cabinet is equipped with a partition support plate, which divides the internal space of the device cabinet into upper and lower areas. The upper area is equipped with the converter modules of the secondary circuit and the primary main circuit in sequence along the depth direction, and the lower area is equipped with the circuit breaker, contactor, transformer and copper busbar of the primary main circuit. A detachable mounting tray is vertically provided above the partition support plate and can be detachably fixed to the vertical bracket of the cabinet. The converter module is located at the rear end of the mounting tray. The converter module is an independently shielded and packaged module, and a rotation positioning and locking mechanism is provided on the mounting surface of the support plate. The converter module is mechanically connected to the support plate in a detachable manner through the rotation positioning and locking mechanism.

[0006] The partition support plate, as a key structural component inside the cabinet, divides the cabinet into upper and lower independent areas, forming the basic framework of a "layered layout". The core purpose of this design is to achieve functional zoning through physical isolation: the upper area focuses on the integration of the secondary circuit and the converter module (the core component of the primary main circuit), while the lower area concentrates the high-voltage components of the primary main circuit, such as circuit breakers, contactors, transformers, and copper busbars. This reduces electromagnetic interference from high voltage to low voltage from a spatial perspective, providing structural protection for the stable operation of the device.

[0007] Both the spacer support plate and the converter module's encapsulation structure are made of anti-interference materials: the spacer support plate uses metal sheets with electromagnetic shielding properties (such as galvanized steel or aluminum alloy), forming an electromagnetic barrier between the high-voltage and low-voltage areas through physical separation, blocking the electromagnetic signals generated by the lower-level high-voltage components from radiating to the upper-level low-voltage circuits; the converter module's encapsulation shell is made of metal materials with both electromagnetic shielding and thermal conductivity properties, and the shell surface can be optimized to increase the heat dissipation area, allowing the heat generated by the inverter unit and other heat-generating components inside the module to be transferred to the encapsulation shell through thermal conduction; the converter module, through a fully enclosed structure, encloses the internal inverter unit and other core components, which can absorb the high-frequency electromagnetic interference generated during module operation, preventing it from spreading to the external low-voltage circuits, and also resist the interference of electromagnetic signals from the external environment on the module's internal circuits. Through the synergy of material properties and structural design, both enhance the device's anti-electromagnetic interference capability from two dimensions: spatial isolation and source shielding, ensuring the independent and stable operation of the high-voltage and low-voltage systems.

[0008] Furthermore, the copper busbar group includes an incoming copper busbar, a circuit breaker upper copper busbar, a main circuit busbar, a contactor upper copper busbar, an outgoing copper busbar, a transformer primary side connection copper busbar, a transformer secondary side incoming terminal connection copper busbar, and a transformer secondary side outgoing terminal busbar. Each copper busbar is designed for a three-phase system, corresponding to phases a, b, and c respectively, and the three phases of the same copper busbar are parallel and evenly spaced. The converter module also includes a converter inverter unit.

[0009] Planar parallel contact ensures maximum contact area and uniform contact pressure, thereby reducing contact resistance and heat generation. It also ensures mechanical stability to resist external forces and prevent loosening. Good spatial layout also facilitates heat dissipation and later installation and maintenance. In high-voltage scenarios, it can also avoid electric field concentration, ultimately ensuring the safe and efficient operation of the electrical system.

[0010] Furthermore, both the upper copper busbar of the circuit breaker and the upper copper busbar of the contactor are inverted U-shaped and connected by a straight main busbar; the incoming copper busbar is connected to the lower end of the circuit breaker, and the lower end of the contactor is connected to the primary side of the transformer via an outgoing copper busbar. The primary side of the transformer is connected to the primary side outgoing copper busbar via a double L-shaped copper busbar; the three phases of the main circuit busbar are connected to the primary side incoming terminal of the transformer via cables, the secondary side incoming terminal of the transformer is connected to the three phase terminals of the inverter unit via the secondary side busbar, and the secondary side outgoing terminal of the transformer is connected to the N-phase terminal of the inverter unit via the secondary side outgoing terminal busbar.

[0011] The inverter unit is the core component of the inverter module to realize the functions of power conversion and voltage regulation. It is mainly used to invert DC power into AC power and work with the transformer to regulate the output voltage.

[0012] The incoming copper busbar, serving as the starting point for electrical energy input, is connected to the lower end of the circuit breaker. The circuit breaker's on / off control ensures safe circuit access. The busbar, acting as an intermediate hub, connects to the upper copper busbar of the contactor, allowing electrical energy to be transferred through the contactor's switching mechanism, then through the lower outgoing copper busbar of the contactor and the primary side connecting copper busbar of the transformer to the primary side outgoing terminal. Furthermore, the three phases of the busbar are directly connected to the primary side incoming terminal of the transformer via cables, forming a dual-path access structure on the primary side of the transformer, ensuring redundancy in power transmission. On the secondary side of the transformer, after conversion, the electrical energy is connected from the secondary side incoming terminal to the three-phase terminals of the inverter unit via the connecting copper busbar. The secondary side outgoing terminals are then connected to the N-phase terminal of the inverter unit via the outgoing busbar, completing the three-phase four-wire power conversion output. This copper busbar layout creates a regular conductive path in the main circuit, resulting in a clear and standardized process layout, facilitating manufacturing, reducing wiring hassles by replacing large-diameter cables, and improving heat dissipation.

[0013] Furthermore, the rotary positioning and locking mechanism includes a slide rail, a sliding bolt passing through the slide rail, and a positioning pin located on one side of the slide rail.

[0014] The rotary positioning and locking mechanism is a key component for enabling the detachable connection between the converter module and the bay support plate. Its working logic is as follows: during installation, the rotational motion calibrates the converter module along a preset trajectory to ensure installation accuracy; once in place, the locking mechanism triggers multi-directional constraints (such as radial clamping and axial limiting) to form a stable mechanical connection, preventing displacement due to vibration during operation. This integrated design of "rotary positioning + locking fixation" simplifies the converter module's assembly and disassembly process (eliminating the need to remove each fixing bolt individually) while ensuring connection strength, balancing maintenance convenience and operational reliability.

[0015] This assembly method employs a three-stage fixing mechanism of "sliding adjustment - pin positioning - bolt locking," which ensures both the flexibility of module posture adjustment and the rigidity of the connection through a multi-constraint point design, meeting the installation accuracy requirements of precision electrical equipment.

[0016] Furthermore, L-shaped connecting brackets are provided on both sides of the mounting tray, and one right-angled surface of the L-shaped connecting bracket is detachably connected to the tray by bolts; symmetrically arranged handles are mounted on both sides of the detachable mounting tray; the intermediate relay, terminal block, and switching power supply in the secondary circuit are fixed to the surface of the mounting tray by a matching slide rail; continuous wiring grooves are provided around the relay, terminal block, and switching power supply, and the three are mounted on the surface of the detachable mounting tray by slide rails, and the continuous wiring grooves are provided around the perimeter, so that the cables are neatly routed through the wiring grooves, making the connection path clear and orderly, reducing signal interference, and facilitating assembly and maintenance.

[0017] Furthermore, the upper part of the left and right side panels of the device cabinet is provided with matrix-arranged waist-shaped heat dissipation holes, and the geometric center of the waist-shaped heat dissipation holes is aligned with the heat source of the converter module in the horizontal direction; the bottom of the cabinet door is provided with honeycomb heat dissipation holes, and when the cabinet door is closed, the projection area of ​​the honeycomb heat dissipation mesh covers at least part of the heat dissipation area of ​​the front end of the transformer.

[0018] The matrix-style, waist-shaped ventilation holes on the upper part of the left and right side panels of the device cabinet are precisely aligned horizontally with the heat source of the inverter module, forming a directional convection airflow channel. This natural airflow dissipates heat from the surface of the encapsulated shell into the cabinet, achieving efficient heat dissipation within the closed structure. Simultaneously, the installation gap between the inverter module and the spacer support plate, along with the spatial layout of the upper area of ​​the cabinet, provides a pathway for heat diffusion. Combined with the thermal conductivity of the shell and the airflow design of the cabinet, this ensures timely heat dissipation from the module while maintaining the integrity of the closed structure, preventing high temperatures from affecting operational stability.

[0019] Furthermore, the structural configuration of the device cabinet includes: transformer heat dissipation components are symmetrically arranged at the bottom of the left and right side panels of the device cabinet; the heat dissipation components include heat dissipation fan mounting brackets and heat dissipation fans installed on the brackets; the air outlet axis of the fan is perpendicular to and directly opposite the heat dissipation surface of the transformer.

[0020] The fan outlet axis is perpendicular to the transformer heat dissipation surface, forming a forced convection channel from the bottom of the cabinet upwards. This design directly acts on the transformer heat dissipation surface through directional air supply, enhances the air flow speed, accelerates heat dissipation, solves the problem of heat accumulation caused by power loss in the transformer, and works in conjunction with the cabinet's natural heat dissipation structure to form a layered heat dissipation system, improving the overall thermal stability of the device.

[0021] Furthermore, the device cabinet is also equipped with a data communication interface group, which includes at least one wired communication interface and at least one wireless communication module interface. The wired communication interface is used to realize wired data transmission between the device and external devices, and the wireless communication module interface is used to connect an external wireless communication module to realize the device's wireless data communication function.

[0022] This "wired + wireless" dual-interface configuration not only meets the stability requirements of traditional wired connections, but also adapts to the wireless communication scenarios of modern intelligent systems, improving the compatibility of the device with external systems and the flexibility of data interaction.

[0023] The advantages and beneficial effects of this utility model are as follows: 1. Excellent isolation between strong and weak currents: Physical separation between upper and lower areas is achieved through the spacer support plate. Combined with the partitioned layout and physical boundary design of the strong and weak current modules, the electromagnetic interference path is cut off at the spatial level, which greatly reduces the interference of the strong current circuit to the weak current control signal, improves the stability and control accuracy of the device operation, and solves the signal disorder problem caused by the mixing of strong and weak currents in traditional devices. 2. Convenient and efficient installation and maintenance: The converter module adopts a positioning and locking component with rotation function, which can flexibly adjust the position along a preset trajectory and lock it quickly; the low-voltage module is installed on a detachable tray, supporting overall disassembly and assembly. These two designs reduce the tedious process of disassembling and assembling components one by one, significantly shortening installation and maintenance time and reducing labor costs, making it especially suitable for batch assembly and on-site emergency repair scenarios. 3. Comprehensive optimization of heat dissipation performance: The matrix-style waist-shaped heat dissipation slots, honeycomb heat dissipation holes and transformer heat dissipation components form a multi-dimensional heat dissipation system. The waist-shaped heat dissipation slots are precisely aligned with the heat source of the converter module, and the cooling fan is directly facing the heat dissipation surface of the transformer to form a forced convection channel, ensuring that the heat of each core component is quickly dissipated, avoiding performance degradation or failure due to high temperature, and extending the service life of the device.

[0024] 4. Structural design is standardized and reasonable: Standardized installation benchmarks (such as detachable trays and positioning locking components) ensure that the layout of each module is uniform. The modular connection of the copper busbar simplifies the wiring process, which not only improves the aesthetics and standardization of the internal structure of the device, but also reduces assembly errors and facilitates large-scale production and quality control. Attached Figure Description

[0025] Figure 1 This is a front view of a power electronic voltage regulator that isolates strong and weak electrical circuits. Figure 2 This is a partially enlarged schematic diagram of the secondary circuit; Figure 3 This is a front view of the lower section of the device cabinet; Figure 4 This is a 3D view of the lower area of ​​the device cabinet; Figure 5 This is an installation diagram of the converter module; Figure 6 This is a schematic diagram of the exploded structure of the cabinet of a power electronic voltage regulator that isolates strong and weak currents; Figure 7 This is a schematic diagram of the heat dissipation system of a power electronic voltage regulator that isolates strong and weak electrical circuits. Figure 8 This is a schematic diagram of the wireless communication of a power electronic voltage regulator that isolates strong and weak currents. In the diagram: 1. Incoming copper busbar; 2. Upper copper busbar of circuit breaker; 3. Main circuit busbar; 4. Upper copper busbar of contactor; 5. Outgoing copper busbar; 6. Transformer primary side connection copper busbar; 61. Transformer primary side incoming terminal; 62. Transformer primary side outgoing terminal; 7. Transformer secondary side incoming terminal connection copper busbar; 71. Transformer secondary side incoming terminal; 8. Transformer secondary side outgoing terminal busbar; 81. Transformer secondary side outgoing terminal; 9. Circuit breaker; 10. Connection 11. Device cabinet; 12. Waist-shaped heat dissipation hole; 13. Cooling fan; 14. Honeycomb heat dissipation hole; 15. Wireless communication module; 16. Spacing support plate; A. Secondary circuit; A1. Intermediate relay; A2. Terminal block; A3. Switching power supply; A4. Detachable mounting tray; A5. Handle; A6. L-shaped connecting bracket; A7. Wiring trough; B. Converter module; B1. Sliding bolt; B2. Slide rail; B3. Positioning pin. Detailed Implementation

[0026] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this invention and should not be construed as limiting the scope of protection of this invention.

[0027] Example 1 like Figure 1 As shown, this embodiment provides a power electronic voltage regulating device with strong and weak current isolation, including a device cabinet 11. The device cabinet 11 is provided with a primary main circuit and a secondary circuit A. The primary main circuit includes a converter module B, a circuit breaker 9, a contactor 10, a transformer, and a copper busbar group. The secondary circuit A includes an intermediate relay A1, a terminal block A2, and a switching power supply A3. In high-voltage operation, the circuit breaker 9, contactor 10, transformer, and converter module B are electrically connected via copper busbars, with the specific connection method configured according to the user's circuit functional requirements. In low-voltage operation, the output of the switching power supply A3 is connected to the power interface of terminal block A2 via a cable, and is connected to the power input terminal of the intermediate relay via terminal block A2, providing a stable DC operating voltage to the intermediate relay A1, thus powering the intermediate relay A1. The contact pins of the intermediate relay A1 are connected to the signal interface of terminal block A2 via cables. The control terminal of contactor 10 in the circuit is electrically connected to the signal output interface of terminal block A2 in secondary circuit A via a cable. Terminal block A2 acts as a signal relay component. On the one hand, it receives external control signals (such as instructions from converter module B or other control modules) and transmits them to the coil of intermediate relay A1 to control the opening and closing of its intermediate contacts. On the other hand, the contact signals of intermediate relay A1 are relayed through terminal block A2 to other related components (such as the control terminal of contactor 10 in the primary circuit or external monitoring equipment), realizing indirect control and signal feedback of the primary circuit from secondary circuit A. The primary main circuit mainly operates in a high-voltage state and is generally referred to as a high-voltage module. The secondary circuit A mainly operates in a low-voltage state and is generally referred to as a low-voltage module.

[0028] The device cabinet 11 is provided with a partition support plate 16, which divides the internal space of the device cabinet 11 into two areas: an upper and a lower area. The upper area is equipped with the secondary circuit A and the converter module B in the primary main circuit in sequence along the depth direction, while the lower area is equipped with the circuit breaker 9, contactor 10, transformer and copper busbar group in the primary main circuit. A detachable mounting tray A4 is vertically provided above the partition support plate 16 and can be detachably fixed to the vertical bracket of the cabinet. The converter module B is located at the rear end of the mounting tray A4. The converter module B is an independently shielded and encapsulated module. A rotary positioning and locking mechanism is provided on the mounting surface of the support plate. The converter module B forms a detachable mechanical connection with the support plate through the rotary positioning and locking mechanism.

[0029] In this embodiment, the copper busbar group includes an incoming copper busbar 1, an upper copper busbar 2 of the circuit breaker 9, a main circuit busbar 3, an upper copper busbar 4 of the contactor 10, an outgoing copper busbar 5, a primary side connecting copper busbar 6 of the transformer, a secondary side incoming terminal 71 connecting copper busbar 7 of the transformer, and a secondary side outgoing terminal 81 busbar 8 of the transformer. Preferably, the incoming copper busbar 1 is connected to the lower end of the circuit breaker 9, the upper copper busbar 2 of the circuit breaker 9 is connected to the main circuit busbar 3, the main circuit busbar 3 is connected to the upper copper busbar 4 of the contactor 10, the lower end of the contactor 10 is connected to the primary side connection copper busbar 6 of the transformer via the outgoing copper busbar 5, and the primary side connection copper busbar 6 of the transformer is connected to the primary side outgoing terminal 62 of the transformer; the three phases of the main circuit busbar 3 are respectively connected to the primary side incoming terminal 61 of the transformer via cables, the secondary side incoming terminal 71 of the transformer is connected to the three phase terminals of the inverter unit via the secondary side connection copper busbar, and the secondary side outgoing terminal 81 of the transformer is connected to the N-phase terminal of the inverter unit via the secondary side outgoing terminal 81 busbar 8.

[0030] The incoming copper busbar 1 serves as the starting point for electrical energy input, connected to the lower end of circuit breaker 9. The circuit breaker 9 controls the on / off state of the circuit, ensuring safe circuit access. The busbar acts as an intermediate hub, connecting to the upper copper busbar 4 of contactor 10. This allows electrical energy, after being switched by contactor 10, to be conducted through the lower outgoing copper busbar 5 of contactor 10 and the primary side connecting copper busbar 6 of the transformer to the primary side outgoing terminal 62 of the transformer. Furthermore, the three phases of the busbar are directly connected to the primary side incoming terminal 61 of the transformer via cables, forming a dual-path access structure on the primary side of the transformer, ensuring redundancy in power transmission. On the secondary side of the transformer, after conversion, the electrical energy is connected from the secondary side incoming terminal to the three-phase terminals of the inverter unit via the connecting copper busbar. The secondary side outgoing terminals are then connected to the N-phase terminal of the inverter unit via the outgoing busbar, completing the three-phase four-wire power conversion output. This copper busbar layout creates a regular conductive path in the main circuit, making the process layout clear and standardized, facilitating manufacturing, reducing wiring hassles by replacing large-diameter cables, and also improving heat dissipation.

[0031] Example 2 like Figure 4 As shown, in this embodiment, the rotary positioning and locking mechanism includes a slide rail B2, a sliding bolt B1 disposed on the slide rail B2, and a positioning pin B3 disposed on one side of the guide rail.

[0032] The rotary positioning and locking mechanism is a key component for achieving the detachable connection between converter module B and the bay support plate 16. Its working logic is as follows: during installation, the mechanism rotates along a preset trajectory to calibrate the position of converter module B, ensuring installation accuracy; once in place, the locking mechanism triggers multi-directional constraints (such as radial clamping and axial limiting), forming a stable mechanical connection and preventing displacement due to vibration during operation. This integrated design of "rotary positioning + locking fixation" simplifies the assembly and disassembly process of converter module B (eliminating the need to remove each fixing bolt individually) while ensuring connection strength, balancing maintenance convenience and operational reliability.

[0033] In this embodiment, the converter module B is assembled with the partition support plate 16 via a sliding guide rail assembly: First, the sliding bolt B1 is placed in a relaxed state, allowing the converter module B to be inserted into the sliding guide rail along the front direction of the cabinet; the position of the module is adjusted by the guide rail, and after rotation, offset and other attitude calibrations, it reaches the reference position; then, the positioning pin B3 is embedded into the positioning hole system of the partition support plate 16 to achieve the initial positioning constraint between the guide rail and the support plate; finally, a rigid connection is formed by tightening the sliding bolt B1, completing the entire installation process.

[0034] Preferably, in this embodiment, the vertical mounting bracket is an L-shaped connecting bracket A6, one right-angled surface of which is detachably connected to the tray by bolts; the detachable mounting tray A4 is equipped with symmetrically arranged handles A5 on both sides; the intermediate relay A1, terminal block A2, and switching power supply A3 in the secondary circuit A are fixed to the surface of the mounting tray A4 by a matching slide rail (not shown in the figure); the relay, terminal block A2, and switching power supply A3 are provided with continuous wiring grooves A7 around them, and the three are mounted on the surface of the detachable mounting tray A4 by slide rails, and the continuous wiring grooves A7 are provided around them. The cables are neatly routed through the wiring grooves A7, making the connection path clear and orderly, reducing signal interference, and facilitating assembly and maintenance.

[0035] Example 3 like Figure 5 As shown, in this embodiment, the upper part of the left and right side plates of the device cabinet 11 is provided with matrix-arranged waist-shaped heat dissipation holes 12, and the geometric center of the waist-shaped heat dissipation holes 12 is aligned with the heat source of the converter module B in the horizontal direction; the bottom of the cabinet door of the cabinet is provided with honeycomb heat dissipation holes 14, and when the cabinet door is closed, the projection area of ​​the honeycomb heat dissipation mesh covers at least part of the heat dissipation area of ​​the front end face of the transformer.

[0036] This partitioned heat dissipation design improves heat dissipation efficiency by precisely aligning the slots with the heat source, ensuring that the heat dissipation needs of different modules are met.

[0037] Preferably, the structural configuration of the device cabinet 11 includes: transformer heat dissipation components are symmetrically arranged at the bottom of the left and right side door panels of the device cabinet 11, the heat dissipation components include a heat dissipation fan 13 mounting bracket and a heat dissipation fan 13 mounted on the bracket, and the air outlet axis of the fan is perpendicular to and directly opposite the heat dissipation surface of the transformer.

[0038] Preferred, such as Figure 6As shown, in this embodiment, the device cabinet 11 is also provided with a data communication interface group, which includes at least one wired communication interface and at least one wireless communication module 15 interface. The wired communication interface is used to realize wired data transmission between the device and external devices, and the wireless communication module 15 interface is used to connect an external wireless communication module 15 to realize the wireless data communication function of the device.

[0039] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A power electronic voltage regulating device for strong and weak electric isolation, comprising a device cabinet, characterized in that: The device cabinet contains a primary main circuit for high-voltage components and a secondary circuit for low-voltage components; the primary main circuit includes a converter module, circuit breaker, contactor, transformer, and copper busbar assembly; the secondary circuit includes intermediate relays, terminal blocks, and switching power supply. The circuit breaker, contactor, transformer, and converter module are electrically connected via copper busbars; the output terminal of the switching power supply is connected to the power interface of the terminal block via a cable, and is also connected to the power input terminal of the intermediate relay via the terminal block; the contact pins of the intermediate relay are connected to the signal interface of the terminal block via cables; the control terminal of the contactor in the primary circuit is electrically connected to the signal output interface of the terminal block in the secondary circuit via a cable. The device cabinet is equipped with a partition support plate, which divides the internal space of the device cabinet into upper and lower areas. The upper area is equipped with the converter modules of the secondary circuit and the primary main circuit in sequence along the depth direction, and the lower area is equipped with the circuit breaker, contactor, transformer and copper busbar of the primary main circuit. A detachable mounting tray is vertically provided above the partition support plate and can be detachably fixed to the vertical bracket of the cabinet. The converter module is located at the rear end of the mounting tray. The converter module is an independently shielded and packaged module, and a rotation positioning and locking mechanism is provided on the mounting surface of the support plate. The converter module is mechanically connected to the spacer support plate in a detachable manner through the rotation positioning and locking mechanism.

2. The power electronic voltage regulating device of claim 1, wherein, The copper busbar group includes an incoming copper busbar, a circuit breaker upper copper busbar, a main circuit busbar, a contactor upper copper busbar, an outgoing copper busbar, a transformer primary side connection copper busbar, a transformer secondary side incoming terminal connection copper busbar, and a transformer secondary side outgoing terminal busbar. Each copper busbar is designed for a three-phase system, corresponding to phases a, b, and c respectively, and the three phases of the same copper busbar are parallel and evenly spaced. The converter module also includes a converter inverter unit.

3. The power electronic voltage regulating device of claim 2, wherein, The upper copper busbars of the circuit breaker and the contactor are both inverted U-shaped and connected by a straight main busbar. The incoming copper busbar is connected to the lower end of the circuit breaker. The lower end of the contactor is connected to the primary side connecting copper busbar of the transformer via an outgoing copper busbar. The primary side connecting copper busbar of the transformer is connected to the primary side outgoing terminal of the transformer via a double L-shaped copper busbar. The three phases of the main circuit busbar are connected to the primary side incoming terminal of the transformer via cables. The secondary side incoming terminal of the transformer is connected to the three phase terminals of the inverter unit via the secondary side connecting copper busbar. The secondary side outgoing terminal of the transformer is connected to the N-phase terminal of the inverter unit via the secondary side outgoing terminal busbar.

4. The power electronic voltage regulating device of claim 1, wherein, The rotary positioning and locking mechanism includes a slide rail, a sliding bolt passing through the slide rail, and a positioning pin located on one side of the slide rail.

5. The power electronic voltage regulating device of claim 1, wherein, The vertical support of the cabinet is an L-shaped connecting bracket, and one of the right angle surfaces of the L-shaped connecting bracket is detachably connected to the tray by bolts; the detachable mounting tray is equipped with symmetrically arranged handles on both sides; the intermediate relay, terminal block and switching power supply in the secondary circuit are fixed to the surface of the mounting tray by a matching slide rail; continuous wiring grooves are provided around the relay, terminal block and switching power supply, and the wiring grooves are arranged circumferentially along the surface of the tray.

6. The power electronic voltage regulating device of claim 1, wherein, The upper part of the left and right side panels of the device cabinet is provided with a matrix of waist-shaped heat dissipation holes, and the geometric center of the waist-shaped heat dissipation holes is aligned with the heat source of the converter module in the horizontal direction; the bottom of the cabinet door is provided with honeycomb heat dissipation holes, and when the cabinet door is closed, the projection area of ​​the honeycomb heat dissipation mesh covers at least part of the heat dissipation area of ​​the front end of the transformer.

7. The power electronic voltage regulating device of claim 1, wherein, The structural configuration of the device cabinet includes: transformer heat dissipation components are symmetrically arranged at the bottom of the left and right side panels of the device cabinet. The heat dissipation components include heat dissipation fan mounting brackets and heat dissipation fans installed on the brackets. The air outlet axis of the fan is perpendicular to and directly opposite the heat dissipation surface of the transformer.

8. The power electronic voltage regulating device of claim 1, wherein, The device cabinet is also equipped with a data communication interface group, which includes at least one wired communication interface and at least one wireless communication module interface.

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