An assembled power quality monitoring device

Abstract

This utility model discloses an assembled power quality monitoring device, including a detachable and fixed first cabinet and a second cabinet. Electrical equipment for voltage and power flow regulation is installed inside the first and second cabinets via electrical connections. A positioning mounting block is fixed to one outer surface of the second cabinet. A positioning mounting hole corresponding to the positioning mounting block is opened on one side surface of the first cabinet, allowing the positioning mounting block to be inserted into the positioning mounting hole. A positioning mounting component, movable vertically and engaging with the positioning mounting block to position it within the positioning mounting hole, is provided on one inner wall of the first cabinet. By replacing traditional fasteners with a mechanically linked positioning mounting structure, the assembled power quality monitoring device can be quickly assembled and disassembled while ensuring the stability of the cabinet connection, effectively solving the problems of inconvenient, time-consuming, and labor-intensive maintenance of existing devices.

Description

Technical Field

[0001] This utility model relates to the technical field of power quality monitoring equipment, specifically to an assembled power quality monitoring device. Background Technology

[0002] Power quality monitoring is a crucial aspect of power system operation and maintenance. It involves the continuous or periodic measurement, recording, analysis, and evaluation of fundamental electrical parameters such as voltage, current, and frequency within the power system using specialized monitoring equipment and techniques. Core monitoring indicators include voltage deviation, frequency deviation, voltage fluctuation and flicker, three-phase unbalance, and harmonic content. Accurate power quality monitoring allows for a comprehensive understanding of the power system's operational status, providing data support for system optimization and stability control. Power quality monitoring is particularly critical in scenarios such as renewable energy grid integration and the application of flexible DC-DC converters. Flexible DC-DC converters, leveraging voltage source converter circuits based on fully controllable devices and pulse width modulation technology, can independently control active and reactive power output, providing reactive power support to the AC system. This plays a vital role in stabilizing voltage and improving power quality, and power quality monitoring devices are the core equipment for monitoring and protecting this process.

[0003] In practical applications, power quality monitoring devices typically need to be integrated with other equipment to achieve grid-connected monitoring and comprehensive protection functions. Utility model patent application number 202323334757.8 discloses a power quality monitoring device. This device includes a main body and a fixing component. The main body is movably connected to the fixing component via a T-shaped block. One side of the main body has a mounting plate with mounting holes, and the surface is equipped with a button protection component. The fixing component is fitted with a limit component. This device features a small footprint in the electrical cabinet, ease of maintenance and replacement, and high stability.

[0004] However, existing modular power quality monitoring devices still have significant shortcomings in practical use. In the assembly and fixing process, the industry commonly uses screws or bolts to connect and fix the casings. When a casing malfunctions and requires disassembly for repair, workers must use specialized tools such as screwdrivers to tighten or loosen each screw individually. This reliance on fasteners makes the disassembly process cumbersome and time-consuming, greatly increasing the difficulty and time cost of maintenance, causing numerous inconveniences for on-site maintenance, and failing to meet the actual needs of efficient operation and maintenance. Therefore, to address the deficiencies in the disassembly and maintenance of existing modular power quality monitoring devices, an improved technical solution is urgently needed to optimize their assembly and disassembly performance. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the aforementioned background technology and provide a modular power quality monitoring device that is easy to assemble and disassemble and convenient to maintain.

[0006] To achieve this objective, the modular power quality monitoring device designed in this utility model includes a detachable and fixed first cabinet and a second cabinet. Electrical equipment for voltage and power flow regulation is installed inside the first cabinet and the second cabinet via electrical connection. A positioning mounting block is fixed on one outer surface of the second cabinet. A positioning mounting hole corresponding to the positioning mounting block is opened on one side surface of the first cabinet. The positioning mounting block can be inserted into the positioning mounting hole. A positioning mounting component that can move up and down, cooperates with the positioning mounting block, and positions the positioning mounting block in the positioning mounting hole is provided on one inner wall of the first cabinet.

[0007] Furthermore, at least one positioning mounting block is fixed on the upper and lower sides of one side of the outer surface of the second cabinet, at least one positioning mounting hole is opened on the upper and lower sides of one side of the first cabinet, and at least one positioning mounting component is provided on the upper and lower sides of one side of the inner wall of the first cabinet.

[0008] Furthermore, the positioning and mounting assembly includes a limiting plate and a lifting assembly for driving the limiting plate to move up and down, and the side of the positioning and mounting block that is inserted into the positioning and mounting hole has a limiting groove that cooperates with the limiting plate.

[0009] Furthermore, the lifting assembly includes a lifting fixing frame fixed to one inner wall of the first cabinet, a lifting drive component disposed within the lifting fixing frame, and a lifting connector connecting the lifting drive component and the limiting plate; the lifting drive component can drive the lifting connector to move synchronously, thereby driving the limiting plate to move up and down.

[0010] Furthermore, the lifting drive component includes a bidirectional screw rotatably disposed within the lifting fixed frame. The lifting fixed frame can limit the axial and radial movement of the bidirectional screw. The lifting connection component includes at least two moving blocks that respectively engage with the bidirectional threads of the bidirectional screw and at least two connecting rods corresponding to the moving blocks. The two ends of the connecting rods are respectively hinged to the moving blocks and the limiting plate.

[0011] Furthermore, the limiting plate is fixed above the movable plate, and one side surface of the movable plate slides up and down against the inner wall of one side of the first cabinet. The length of the movable plate is greater than the width of the positioning mounting hole, and the movable plate is hinged to one end of the connecting rod.

[0012] Furthermore, one end of the bidirectional screw passes through the lifting and fixing frame and is coaxially fixedly connected to a rotating plate. The bidirectional screw can be driven to rotate by rotating the rotating plate.

[0013] Furthermore, a rotation limiting mechanism is connected between the rotating plate and the lifting and fixing frame to prevent the rotating plate from rotating. The rotation limiting mechanism includes a rotation limiting rod that passes vertically through one side of the rotating plate and slides with the rotating plate. One end of the rotation limiting rod is connected to the rotating plate with an elastic pushing structure, and the other end of the rotation limiting rod can be inserted into the lifting and fixing frame and positioned within the lifting and fixing frame. By inserting the other end of the rotation limiting rod into the lifting and fixing frame and pushing the rotating plate with the elastic pushing structure, the rotation of the rotating plate can be restricted. By removing the other end of the rotation limiting rod from the lifting and fixing frame, the rotation restriction on the rotating plate can be removed.

[0014] Furthermore, the elastic pushing structure includes a limiting plate coaxially fixed to one end of the rotation limiting rod, the diameter of the limiting plate being larger than the diameter of the rotation limiting rod, and an elastic element coaxially sleeved on the rotation limiting rod being fixedly connected between the limiting plate and the rotating plate.

[0015] Furthermore, the electrical equipment includes a manual bypass switch, an AC terminal, a transformer, and a series-side module disposed inside the first cabinet, the series-side module being electrically connected to the manual bypass switch, the AC terminal, and the transformer.

[0016] The beneficial effects of this utility model are:

[0017] Assembly and disassembly are convenient and efficient, reducing maintenance costs: The initial positioning of the first and second cabinets is achieved through the cooperation of positioning mounting blocks and positioning mounting holes, followed by fixing using positioning mounting components, replacing the traditional screw connection method. Disassembly requires no screwdrivers or other specialized tools; simply rotating the bidirectional screw via an operating plate separates the limit plate from the positioning mounting block, significantly simplifying the disassembly process. The entire disassembly process eliminates the need to tighten each screw individually, significantly reducing operational steps and time costs during maintenance, lowering the difficulty of on-site maintenance, and meeting the practical needs of efficient power system operation and maintenance.

[0018] High connection stability ensures safe equipment operation: The positioning and installation component, through a linkage structure of bidirectional screws, moving blocks, and connecting rods, drives the limit plate to precisely insert into the limit groove of the positioning and installation block, forming a mechanical locking structure. This structure ensures uniform force on the limit plate through synchronous transmission of bidirectional threads, preventing loosening of the cabinet connection. The rotation limit mechanism, through an elastic pushing structure, inserts the rotation limit rod into the lifting and fixing frame, further preventing accidental rotation of the rotating plate, ensuring the connection stability of the cabinet during operation, and reducing the risk of detachment due to vibration or external forces.

[0019] The structural design is reasonable and highly adaptable: the positioning mounting blocks and holes are symmetrically arranged on the upper and lower sides of the cabinet, and the large-area fitting design of the movable plate can evenly distribute the force on the cabinet connection parts, avoiding structural deformation caused by excessive local stress. The length of the movable plate is greater than the width of the positioning mounting holes, which not only ensures the effective limitation of the positioning mounting blocks, but also improves the guidance and stability of the overall structure through the sliding fitting design of the inner wall. The layout of electrical equipment (such as manual bypass switches, electrical connections between transformers and series side modules) is adapted to the cabinet structure, ensuring that the monitoring device can be easily disassembled and assembled without affecting the realization of core functions such as voltage regulation and power flow control.

[0020] Simple to operate, requiring no professional skills: Assembly and disassembly of the device can be completed by rotating the rotating plate. Combined with the elastic positioning design of the rotation limit rod, operators can quickly master the operation method without professional training. Compared to the cumbersome process of traditional screw connections, it greatly reduces the reliance on the operator's skill level.

[0021] In summary, this utility model replaces traditional fasteners with a mechanically linked positioning and installation structure, achieving rapid assembly and disassembly of the modular power quality monitoring device while ensuring the stability of the cabinet connection. This effectively solves the problems of inconvenient, time-consuming, and labor-intensive maintenance of existing devices. The structural design balances convenience and safety, making it suitable for scenarios with high power quality monitoring requirements, such as new energy grid connection and flexible DC converters, providing strong support for the efficient operation and maintenance of power systems. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the disclosed embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0023] Figure 1 This is a perspective view of the assembled power quality monitoring device of this utility model;

[0024] Figure 2 This is a perspective view of the first cabinet in this utility model;

[0025] Figure 3 This is a perspective view of the second cabinet in this utility model;

[0026] Figure 4 This is a three-dimensional structural view of the relative assembly positions of the first assembly plate and the second assembly plate in this utility model;

[0027] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0028] Figure 6 This is a front view of the rotation limit rod in this utility model;

[0029] Figure 7 This is a front view of the positioning hole in this utility model;

[0030] Among them, 100—first cabinet, 110—manual bypass switch, 120—AC terminal, 130—transformer, 140—first assembly plate, 141—positioning mounting hole, 150—lifting and fixing frame, 151—bidirectional screw, 152—moving block, 153—positioning hole, 160—moving plate, 161—fixed block, 163—limiting plate, 170—rotating plate, 171—limiting disc, 172—spring, 173—rotational limiting rod;

[0031] 200—Second cabinet, 210—Series side module, 220—Second assembly plate, 230—Positioning mounting block, 231—Limiting groove. Detailed Implementation

[0032] The technical solution (including preferred technical solution) of this utility model will be further described in detail below with reference to the accompanying drawings and by listing some optional embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] In some embodiments, such as Figure 1 As shown in Figure 5, the assembled power quality monitoring device designed in this utility model includes a detachable and fixed first cabinet 100 and a second cabinet 200. Electrical equipment for voltage and power flow regulation is installed in the first cabinet 100 and the second cabinet 200 through electrical connection. A positioning mounting block 230 is fixed on one outer surface of the second cabinet 200. A positioning mounting hole 141 corresponding to the positioning mounting block 230 is opened on one side surface of the first cabinet 100. The positioning mounting block 230 can be inserted into the positioning mounting hole 141. A positioning mounting component that can move up and down and cooperates with the positioning mounting block 230 to position the positioning mounting block 230 in the positioning mounting hole 141 is provided on one inner wall of the first cabinet 100.

[0034] Example 1

[0035] Based on some of the above embodiments, a specific embodiment of the positioning and installation component is provided:

[0036] like Figure 1 As shown in Figure 5, a positioning mounting block 230 is fixed on the upper and lower sides of the outer surface of the second assembly plate 220 on the side of the second cabinet 200 near the first cabinet 100. A positioning mounting hole 141 is opened on the upper and lower sides of the surface of the first assembly plate 140 on the side of the first cabinet 100 near the second cabinet 200. A positioning mounting component is provided on the upper and lower sides of the inner wall of the first assembly plate 140.

[0037] The positioning and mounting assembly includes a limiting plate 163 and a lifting assembly for driving the limiting plate 163 to move up and down. The positioning mounting block 230 has a limiting groove 231 on one side that mates with the limiting plate 163 when inserted into the positioning mounting hole 141. The limiting plate 163 is fixed above the movable plate 160. One side surface of the movable plate 160 slides up and down against the inner wall of one side of the first cabinet 100. The length of the movable plate 160 is greater than the width of the positioning mounting hole 141 to prevent the movable plate 160 from sinking into the positioning mounting hole 141. Simultaneously, the first assembly plate 140 supports and guides the movable plate 160. The lifting assembly includes a lifting fixing frame 150 fixed to the inner wall of the first assembly plate 140, a bidirectional screw 151 (lifting drive component) disposed within the lifting fixing frame 150, and a lifting connector connecting the bidirectional screw 151 and the movable plate 160. The lifting fixing frame 150 can limit the axial and radial movement of the bidirectional screw 151. The lifting connector includes two moving blocks 152 that are respectively threaded into the bidirectional screw 151, two fixed blocks 161 fixed to the bottom of the movable plate 160 and located above the moving blocks 152, and two connecting rods 162. The two ends of each connecting rod 162 are hinged to the moving blocks 152 and the fixed blocks, respectively. The rotation of the bidirectional screw 151 can drive the lifting connector to move synchronously, thereby driving the limiting plate 163 to move up and down. To facilitate the rotation of the bidirectional screw, the following structure is designed: one end of the bidirectional screw 151 passes through the lifting and fixing frame 150 and is coaxially fixedly connected to a rotating plate 170. Rotating the rotating plate 170 drives the bidirectional screw 151 to rotate. To prevent the rotating plate 170 from rotating arbitrarily, which could cause instability or disengagement in the connection between the first cabinet 100 and the second cabinet 200, a rotation limit mechanism is connected between the rotating plate 170 and the lifting and fixing frame 150 to prevent the rotating plate 170 from rotating. Figure 5 As shown in Figure 7, the rotation limiting mechanism includes a rotation limiting rod 173 that passes vertically through one side of the rotating plate 170 and slides with the rotating plate 170. One end of the rotation limiting rod 173 is connected to the rotating plate 170 by an elastic pushing structure, and the other end of the rotation limiting rod 173 can be inserted into the positioning hole 153 of the lifting and fixing frame 150 and positioned within the positioning hole 153. Figure 6—7 represents only one positioning fit structure between the rotation limit rod 173 and the positioning hole 153. Positioning can be achieved by inserting the rotation limit rod 173 into the positioning hole 153 and rotating it at a certain angle. In actual production and operation, other structures can also be designed, as long as the positioning fit between the rotation limit rod 173 and the positioning hole 153 can be achieved. By inserting the other end of the rotation limit rod 173 into the lifting and fixing frame 150 and pushing the rotating plate 170 through the elastic pushing structure, the rotation of the rotating plate 170 can be restricted. The rotation restriction of the rotating plate 170 can be removed by removing the other end of the rotation limit rod 173 from the lifting and fixing frame 150. The elastic pushing structure includes a limiting plate 171 coaxially fixed to one end of the rotation limit rod 173. The diameter of the limiting plate 171 is larger than the diameter of the rotation limit rod 173. A spring 172 coaxially sleeved on the rotation limit rod 173 is fixedly connected between the limiting plate 171 and the rotating plate 170.

[0038] Example 2

[0039] Based on some of the above embodiments, a specific embodiment of an electrical device is provided:

[0040] like Figure 1 As shown in Figure 3, a manual bypass switch 110 is fixed in the middle of the inner cavity of the first housing 100. AC terminals 120 are fixedly connected to the upper and lower sides of the inner side of the first housing 100. A transformer 130 is fixed in the lower part of the inner cavity of the first housing 100. A series-side module 210 is fixed in the inner cavity of the second housing 200. The series-side module 210 is electrically connected to the manual bypass switch 110, the AC terminals 120, and the transformer 130. The series-side module 210 and the transformer 130 can regulate the voltage and amplitude of the output side of the transformer 130, thereby realizing voltage and power flow regulation. The logic and protection (bypass switch) control of the entire system are completed by the series inverter.

[0041] Example 3

[0042] Based on the above embodiment 1, a method for assembling a modular power quality monitoring device is provided:

[0043] During installation, the first housing 100 and the second housing 200 are brought close together, and the first assembly plate 140 and the second assembly plate 220 are brought close together. At this time, the mounting plate 230 moves into the positioning mounting hole 141 on the first assembly plate 140. Then, the limiting plate 171 is rotated and pulled outward, causing the rotating limiting rod 173 to move out of the positioning hole 153. The rotating plate 170 is rotated, which drives the bidirectional screw 151 to rotate. The bidirectional screw 151 drives the two moving blocks 152 to move relative to each other. 152 drives the fixed block 161 to move via the connecting rod 162. The fixed block 161 drives the movable plate 160 and the limiting plate 163 to move upward. The limiting plate 163 moves into the limiting groove 231 on the positioning mounting block 230. The positioning mounting block 230 is limited in the positioning mounting hole 141 of the first assembly plate 140. It rotates and pushes against the limiting plate 171, so that the rotating limiting rod 173 is inserted into the positioning hole 153 and positioned in the positioning hole 153, thereby realizing the assembly of the first housing 100 and the second housing 200. If it is necessary to disassemble the first cabinet 100 and the second cabinet 200, the limiting plate 171 is rotated and pulled outward, so that the rotating limiting rod 173 moves out of the positioning hole 153. The bidirectional screw 151 is rotated in the opposite direction, so that the limiting plate 163 is dislodged from the limiting groove 231. Then the positioning mounting block 230 is pulled out from the positioning mounting hole 141.

[0044] In summary, this utility model replaces traditional fasteners with a mechanically linked positioning and installation structure, achieving rapid assembly and disassembly of the modular power quality monitoring device while ensuring the stability of the cabinet connection. This effectively solves the problems of inconvenient, time-consuming, and labor-intensive maintenance of existing devices. The structural design balances convenience and safety, making it suitable for scenarios with high power quality monitoring requirements, such as new energy grid connection and flexible DC converters, providing strong support for the efficient operation and maintenance of power systems.

[0045] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will make the disclosure of this utility model thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this utility model are defined only by the scope of the claims. When using the terms "comprising," "having," and "including" as described in this specification, there may also be another part or other parts, and the terms used are generally singular but may also represent plural forms. It should be pointed out that although various different components may appear and be described in this specification using terms such as "first," "second," "top," "bottom," "one side," "the other side," "one end," "the other end," etc., these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component; top and bottom components may, in certain cases, be interchanged or converted; components at one end and at the other end may have the same or different performance characteristics.

[0046] Finally, it should be noted that the above embodiments are merely representative examples of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. An assembled power quality monitoring device, comprising a first cabinet (100) and a second cabinet (200) which are detachably fixed, electrical equipment for voltage and power flow regulation through electrical connection is arranged in the first cabinet (100) and the second cabinet (200), characterized in that: A positioning mounting block (230) is fixed on one outer surface of the second cabinet (200), and a positioning mounting hole (141) corresponding to the positioning mounting block (230) is opened on one side surface of the first cabinet (100). The positioning mounting block (230) can be inserted into the positioning mounting hole (141). A positioning mounting component is provided on one inner wall of the first cabinet (100) that can move up and down, cooperate with the positioning mounting block (230), and position the positioning mounting block (230) in the positioning mounting hole (141).

2. The assembled power quality monitoring device of claim 1, wherein: At least one positioning mounting block (230) is fixed on the upper and lower sides of one side of the outer surface of the second cabinet (200), at least one positioning mounting hole (141) is opened on the upper and lower sides of one side of the first cabinet (100), and at least one positioning mounting component is provided on the upper and lower sides of one side of the inner wall of the first cabinet (100).

3. The assembled power quality monitoring device of claim 1 or 2, wherein: The positioning and mounting assembly includes a limiting plate (163) and a lifting assembly for driving the limiting plate (163) to move up and down. The positioning and mounting block (230) has a limiting groove (231) that cooperates with the limiting plate (163) on the side where it is inserted into the positioning and mounting hole (141).

4. The assembled power quality monitoring device of claim 3, wherein: The lifting assembly includes a lifting fixing frame (150) fixed on one inner wall of the first cabinet (100), a lifting drive component disposed in the lifting fixing frame (150), and a lifting connector connecting the lifting drive component and the limiting plate (163). The lifting drive component can drive the lifting connector to move synchronously, thereby driving the limit plate (163) to move up and down.

5. The assembled power quality monitoring device of claim 4, wherein: The lifting drive component includes a bidirectional screw (151) rotatably disposed within the lifting fixed frame (150). The bidirectional screw (151) can be axially and radially limited by the lifting fixed frame (150). The lifting connector includes at least two moving blocks (152) that are respectively threaded with the bidirectional screw (151) and at least two connecting rods (162) corresponding one-to-one with the moving blocks (152). The two ends of the connecting rods (162) are respectively hinged to the moving blocks (152) and the limiting plate (163).

6. The assembled power quality monitoring device of claim 5, wherein: The limiting plate (163) is fixed above the movable plate (160). One side surface of the movable plate (160) slides up and down against the inner wall of one side of the first cabinet (100). The length of the movable plate (160) is greater than the width of the positioning mounting hole (141). The movable plate (160) is hinged to one end of the connecting rod (162).

7. The assembled power quality monitoring device of claim 5, wherein: One end of the bidirectional screw (151) passes through the lifting and fixing frame (150) and is coaxially fixedly connected to the rotating plate (170). The bidirectional screw (151) can be driven to rotate by rotating the rotating plate (170).

8. The assembled power quality monitoring device of claim 7, wherein: A rotation limiting mechanism is connected between the rotating plate (170) and the lifting and fixing frame (150) to prevent the rotating plate (170) from rotating. The rotation limiting mechanism includes a rotation limiting rod (173) that passes vertically through one side of the rotating plate (170) and slides with the rotating plate (170). One end of the rotation limiting rod (173) is connected to the rotating plate (170) with an elastic pushing structure. The other end of the rotation limiting rod (173) can be inserted into the lifting and fixing frame (150) and positioned within the lifting and fixing frame (150). By inserting the other end of the rotation limiting rod (173) into the lifting and fixing frame (150) and pushing the rotating plate (170) with the elastic pushing structure, the rotation of the rotating plate (170) can be restricted. By removing the other end of the rotation limiting rod (173) from the lifting and fixing frame (150), the rotation restriction on the rotating plate (170) can be removed.

9. The assembled power quality monitoring device of claim 8, wherein: The elastic pushing structure includes a limiting plate (171) coaxially fixed to one end of the rotating limiting rod (173). The diameter of the limiting plate (171) is larger than the diameter of the rotating limiting rod (173). An elastic element coaxially sleeved on the rotating limiting rod (173) is fixedly connected between the limiting plate (171) and the rotating plate (170).

10. The assembled power quality monitoring device of claim 1, wherein: The electrical equipment includes a manual bypass switch (110), an AC terminal (120), a transformer (130) disposed inside the first cabinet (100), and a series-side module (210) disposed inside the second cabinet (200). The series-side module (210) is electrically connected to the manual bypass switch (110), the AC terminal (120), and the transformer (130).

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