A passive filter cabinet

Abstract

This utility model belongs to the technical field of passive filter structure, and discloses a passive filter cabinet, including a filter reactor, a filter capacitor, a main power switch, a current transformer, a busbar, an insulating bracket, a quick plug, a fixing frame, heat sink fins, a protective fuse, a damping resistor, a voltage transformer, a grounding terminal, and an operation panel; the filter reactor and the filter capacitor are connected in series to form a filter branch, and the main power switch is set between the incoming line and the filter branch. The filter reactor adopts a dry-type iron core structure, and the winding is copper enameled wire. It is fixed on the base and is used to form a filter branch with a specific frequency in series with the capacitor; the filter capacitor is a self-healing metallized film capacitor, which is fixed to the mounting beam by bolts and is connected in series with the filter reactor to form the core of the filter branch; the main power switch is a molded case circuit breaker, which is installed between the incoming line busbar and the filter branch and is used to control the on and off of the filter structure.

Description

Technical Field

[0001] This utility model relates to the field of passive filter structure technology, and in particular to a passive filter cabinet. Background Technology

[0002] In industrial power systems, nonlinear loads such as converters and electric arc furnaces generate a large number of harmonics, leading to grid voltage distortion, equipment overheating, and increased energy consumption. Passive filtering structures have become the mainstream solution for harmonic mitigation due to their low cost and high reliability.

[0003] Traditional passive filter devices suffer from problems such as cumbersome installation, complex wiring, and poor adaptability: each component needs to be fixed, welded, or bolted on-site, which is time-consuming and labor-intensive; different capacity filter branches require redesigned wiring, making it difficult to quickly adapt to load changes; and the lack of standardized connection and fixing structures leads to low maintenance and replacement efficiency. Therefore, we propose a passive filter cabinet. Utility Model Content

[0004] The purpose of this utility model is to provide a passive filter cabinet that solves the existing problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A passive filtering cabinet includes a filter reactor, a filter capacitor, a main power switch, a current transformer, a busbar, an insulating bracket, a quick-connect plug, a fixing frame, heat sink fins, a protective fuse, a damping resistor, a voltage transformer, a grounding terminal, and an operation panel. The filter reactor and the filter capacitor are connected in series to form a filter branch. The main power switch is located between the incoming line and the filter branch. The busbar connects the main power switch and the filter branch. The insulating bracket supports the busbar. The quick-connect plug connects the filter branch and the busbar. The fixing frame fixes all components. The heat sink fins are attached to the filter reactor. The protective fuse is connected in series in the filter branch and is used for overcurrent protection. The damping resistor is connected in parallel to the filter capacitor. The voltage transformer is connected in parallel to the main circuit. The grounding terminal connects the frame to the grounding grid. The operation panel integrates indicator lights and buttons.

[0007] As a further improvement to the above solution, the filter reactor is a dry-type iron-core reactor with copper enameled wire windings, and the bottom is fixed to the inside of the fixed frame by bolts.

[0008] As a further improvement to the above solution, the busbar is made of T2 copper with a tin-plated surface and is fixed by an epoxy resin insulating bracket. The bottom of the insulating bracket is provided with expansion bolts to connect with the fixing frame.

[0009] As a further improvement to the above solution, the quick plug includes a plug body and a socket. The plug body is connected to the output terminal of the filter branch through a wire, and the socket is soldered to the busbar. The two are detachably electrically connected through a snap-fit ​​structure.

[0010] As a further improvement to the above solution, the fixed frame is a rectangular frame welded from C-shaped steel, with waist-shaped mounting holes opened on the side of the frame, and the bases of the filter reactor and filter capacitor are fixed to the waist-shaped holes by bolts.

[0011] As a further improvement to the above solution, the heat dissipation fins are aluminum comb-shaped structures, which are attached to the outer surface of the filter reactor by thermally conductive silicone, and the fin spacing is 8mm.

[0012] As a further improvement to the above solution, the protective fuse is a plug-in type, installed on the fuse base, and the base is fixed to the fixed frame by bolts. The fuse is connected in series in the branch between the filter reactor and the filter capacitor and is used for overcurrent protection.

[0013] As a further improvement to the above solution, the current transformer is a through-core type, sleeved on the outside of the busbar, and the output end of the transformer is connected to the indicator light control circuit of the operation panel through a shielded wire.

[0014] As a further improvement to the above solution, the damping resistor is a wire-wound cement resistor with a resistance of 10Ω. It is fixed to the side of the insulating bracket by an insulating pad and forms a parallel circuit with the filter capacitor.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model discloses a passive filter cabinet. The filter reactor adopts a dry-type iron core structure with copper enameled wire windings and is fixed on the base. It is used to form a filter branch with a specific frequency in series with a capacitor. The filter capacitor is a self-healing metallized film capacitor, which is fixed to the mounting beam by bolts and forms the core of the filter branch in series with the filter reactor. The main power switch is a molded case circuit breaker, which is installed between the incoming bus and the filter branch to control the on / off state of the filter structure.

[0017] This utility model discloses a passive filter cabinet. The current transformer has a through-core structure and is sleeved on the outside of the main circuit busbar to detect the current value of the filter branch. The busbar is made of T-copper with a tin-plated surface and is fixed by an insulating bracket to connect each filter branch to the main circuit. The insulating bracket is made of epoxy resin, L-shaped, and is fixed to the mounting frame at the bottom by expansion bolts. The top supports the busbar to ensure electrical insulation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the circuit structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the circuit structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 5 This is a side view of the structure of this utility model.

[0024] In the diagram: 1. Filter reactor; 2. Filter capacitor; 3. Main power switch; 4. Current transformer; 5. Busbar; 6. Insulating bracket; 7. Quick plug; 8. Fixing frame; 9. Heat sink fins; 10. Protective fuse; 11. For overcurrent protection; 12. Damping resistor; 13. Voltage transformer; 14. Grounding terminal. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] refer to Figure 1-5A passive filter cabinet includes a filter reactor 1, a filter capacitor 2, a main power switch 3, a current transformer 4, a busbar 5, an insulating bracket 6, a quick-connect plug 7, a fixing frame 8, heat dissipation fins 9, a protective fuse 10, a damping resistor 12, a voltage transformer 13, a grounding terminal 14, and an operation panel. The filter reactor 1 and filter capacitor 2 are connected in series to form a filter branch. The main power switch 3 is located between the incoming line and the filter branch. The busbar 5 connects the main power switch 3 and the filter branch. The insulating bracket 6 supports the busbar 5. The quick-connect plug 7 connects the filter branch and the busbar 5. The fixing frame 8 fixes all components. The heat dissipation fins 9 are attached to the filter reactor 1. The protective fuse 10 is connected in series in the filter branch and is used for overcurrent protection 11. The damping resistor 12... Resistor 12 is connected in parallel to filter capacitor 2, voltage transformer 13 is connected in parallel to the main circuit, grounding terminal 14 connects the frame to the grounding grid, and the operation panel integrates indicator lights and buttons; filter reactor 1 adopts a dry-type iron core structure, the winding is copper enameled wire, and it is fixed on the base to form a filter branch with a specific frequency in series with the capacitor; filter capacitor 2 is a self-healing metallized film capacitor, which is fixed to the mounting beam by bolts and forms the core of the filter branch in series with filter reactor 1; the main power switch 3 is a molded case circuit breaker, which is installed between the incoming bus and the filter branch to control the on / off of the filter structure; in this embodiment, filter reactor 1 is a dry-type iron core, the winding is copper enameled wire, and the bottom is fixed to the inside of the fixed frame 8 by bolts.

[0027] In this embodiment, the busbar 5 is made of T2 copper with a tin-plated surface and is fixed by an epoxy resin insulating bracket 6. The bottom of the insulating bracket 6 is provided with expansion bolts and connected to the fixing frame 8. The current transformer 4 is a through-core structure and is sleeved on the outside of the main circuit busbar to detect the current value of the filter branch. The busbar 5 is made of T2 copper with a tin-plated surface and is fixed by an insulating bracket to connect each filter branch to the main circuit. The insulating bracket 6 is made of epoxy resin, L-shaped, and is fixed to the mounting frame at the bottom by expansion bolts. The top supports the busbar 5 to ensure electrical insulation. In this embodiment, the quick plug 7 includes a plug body and a socket. The plug body is connected to the output end of the filter branch through a wire, and the socket is soldered to the busbar 5. The two are detachably electrically connected by a snap-fit ​​structure.

[0028] In this embodiment, the fixing frame 8 is a rectangular frame welded from C-shaped steel, with waist-shaped mounting holes on the side of the frame. The bases of the filter reactor 1 and the filter capacitor 2 are fixed to the waist-shaped holes with bolts. The quick plug 7 consists of a plug body and a socket. The plug connects to the output terminal of the filter branch, and the socket is fixed to the busbar 5. Quick electrical connection is achieved through a snap-fit ​​structure. The fixing frame 8 is a rectangular frame welded from C-shaped steel, with waist-shaped mounting holes on the side of the frame for fixing components such as the filter reactor 1 and the filter capacitor 2. The heat dissipation fins 9 are aluminum comb-shaped structures, which are attached to the outer shell of the filter reactor 1 with thermally conductive silicone to enhance heat dissipation efficiency. In this embodiment, the heat dissipation fins 9 are aluminum comb-shaped structures, which are attached to the outer shell surface of the filter reactor 1 with thermally conductive silicone, and the fin spacing is 8mm.

[0029] In this embodiment, the protective fuse 10 is an insert type, installed on the fuse base, which is fixed to the fixed frame 8 by bolts. The fuse is connected in series in the branch between the filter reactor 1 and the filter capacitor 2 and is used for overcurrent protection 11. The protective fuse 10 is an insert structure, connected in series in the filter branch, and installed on the fuse base for overcurrent protection 11. The damping resistor 12 is a wire-wound cement resistor, fixed to the side of the insulating bracket 6, and connected in parallel with the filter capacitor 2 to suppress resonant overvoltage. The voltage transformer 13 is an oil-immersed structure, with the primary side connected to the main circuit busbar 5 and the secondary side leading out a signal line for detecting the grid voltage. The grounding terminal 14 is a copper plate terminal, fixed to the bottom of the fixed frame 8, and connected to the grid grounding network through a grounding wire to ensure safe grounding. In this embodiment, the current transformer 4 is a through-core type, sleeved on the outside of the busbar 5, and the transformer output is connected to the indicator light control circuit of the operation panel through a shielded wire. In this embodiment, the damping resistor 12 is a wire-wound cement resistor with a resistance of 10Ω. It is fixed to the side of the insulating bracket 6 by an insulating pad and forms a parallel circuit with the filter capacitor 2.

[0030] The implementation principle of a passive filter cabinet in this embodiment is as follows: the filter reactor 1 adopts a dry-type iron core structure with copper enameled wire windings, and is fixed on the base to form a filter branch with a specific frequency in series with a capacitor; the filter capacitor 2 is a self-healing metallized film capacitor, which is fixed on the mounting beam by bolts and forms the core of the filter branch in series with the filter reactor 1; the main power switch 3 is a molded case circuit breaker, which is installed between the incoming bus and the filter branch to control the on / off state of the filter structure.

[0031] The current transformer 4 has a through-core structure and is sleeved on the outside of the main circuit busbar to detect the current value of the filter branch; the busbar 5 is made of T2 copper with a tin-plated surface and is fixed by an insulating bracket to connect each filter branch to the main circuit; the insulating bracket 6 is made of epoxy resin, is L-shaped, and is fixed to the mounting frame at the bottom by expansion bolts, while supporting the busbar 5 at the top to ensure electrical insulation.

[0032] The quick-connect plug 7 consists of a plug body and a socket. The plug connects to the output terminal of the filter branch, and the socket is fixed to the busbar 5. A quick electrical connection is achieved through a snap-fit ​​structure. The fixing frame 8 is a rectangular frame welded from C-shaped steel. The side of the frame has waist-shaped mounting holes for fixing components such as the filter reactor 1 and the filter capacitor 2. The heat dissipation fins 9 are aluminum comb-shaped structures that are attached to the outer shell of the filter reactor 1 with thermally conductive silicone to enhance heat dissipation efficiency.

[0033] The protective fuse 10 is a plug-in type, connected in series in the filter branch and installed on the fuse base for overcurrent protection 11; the damping resistor 12 is a wire-wound cement resistor, fixed to the side of the insulating bracket 6, and connected in parallel with the filter capacitor 2 to suppress resonant overvoltage; the voltage transformer 13 is an oil-immersed structure, with the primary side connected to the main circuit busbar 5 and the secondary side leading out a signal line for detecting the grid voltage; the grounding terminal 14 is a copper plate terminal, fixed to the bottom of the fixed frame 8, and connected to the grid grounding network through a grounding wire to ensure safe grounding.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The passive filter cabinet provided by this utility model has been described in detail above. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A passive filter cabinet, characterized in that The system includes a filter reactor (1), a filter capacitor (2), a main power switch (3), a current transformer (4), a busbar (5), an insulating bracket (6), a quick plug (7), a fixed frame (8), heat sink fins (9), a protective fuse (10), a damping resistor (12), a voltage transformer (13), a grounding terminal (14), and an operation panel. The filter reactor (1) and the filter capacitor (2) are connected in series to form a filter branch. The main power switch (3) is located between the incoming line and the filter branch. The busbar (5) is connected to the main power switch (3). The filter branch is connected to the filter branch and the busbar (5). The insulating bracket (6) supports the busbar (5). The quick plug (7) connects the filter branch and the busbar (5). The fixed frame (8) fixes each component. The heat sink fins (9) are attached to the filter reactor (1). The protective fuse (10) is connected in series with the filter branch and is used for overcurrent protection (11). The damping resistor (12) is connected in parallel with the filter capacitor (2). The voltage transformer (13) is connected in parallel with the main circuit. The grounding terminal (14) connects the frame and the grounding grid. The operation panel integrates indicator lights and buttons.

2. The passive filter cabinet according to claim 1, characterized in that, The filter reactor (1) is a dry-type iron core with copper enameled wire windings, and its bottom is fixed to the inside of the fixed frame (8) by bolts.

3. The passive filter cabinet according to claim 1, characterized in that, The busbar (5) is made of T2 copper and tin-plated on the surface. It is fixed by an epoxy resin insulating bracket (6). The bottom of the insulating bracket (6) is provided with expansion bolts to connect with the fixing frame (8).

4. The passive filter cabinet according to claim 1, characterized in that, The quick plug (7) includes a plug body and a socket. The plug body is connected to the output end of the filter branch through a wire, and the socket is soldered to the busbar (5). The two are detachably electrically connected through a snap-fit ​​structure.

5. The passive filter cabinet according to claim 1, characterized in that, The fixed frame (8) is a rectangular frame welded from C-shaped steel. The frame has waist-shaped mounting holes on its side. The bases of the filter reactor (1) and the filter capacitor (2) are fixed to the waist-shaped holes by bolts.

6. The passive filter cabinet according to claim 1, characterized in that, The heat dissipation fins (9) are aluminum comb-shaped structures, which are attached to the outer surface of the filter reactor (1) by thermally conductive silicone, and the fin spacing is 8mm.

7. The passive filter cabinet according to claim 1, characterized in that, The protective fuse (10) is an insert type and is installed on the fuse base. The base is fixed to the fixed frame (8) by bolts. The fuse is connected in series in the branch between the filter reactor (1) and the filter capacitor (2) and is used for overcurrent protection (11).

8. The passive filter cabinet according to claim 1, characterized in that, The current transformer (4) is a through-core type, which is sleeved on the outside of the busbar (5). The output end of the transformer is connected to the indicator light control circuit of the operation panel through a shielded wire.

9. The passive filter cabinet according to claim 1, characterized in that, The damping resistor (12) is a wire-wound cement resistor with a resistance of 10Ω. It is fixed to the side of the insulating bracket (6) by an insulating pad and forms a parallel circuit with the filter capacitor (2).

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