A circuit breaker gas insulated switchgear for measuring feeder side voltage

Abstract

The utility model relates to a circuit breaker inflation cabinet of measuring feeder side voltage, including installation box, gas tank, voltage transformer, mutual inductor suite and connecting sleeve, gas tank is installed at the top of installation box, and the circuit breaker is installed in the gas tank, and the bottom of circuit breaker is installed with the feeder sleeve, voltage transformer is installed at the bottom of installation box, mutual inductor suite is installed in installation box, and is located one side of voltage transformer, and one end of mutual inductor suite is connected with voltage transformer, one end of connecting sleeve is connected with the other end of mutual inductor suite, and the other end of connecting sleeve is connected with feeder sleeve. Differ from prior art, the above technical scheme is installed with voltage transformer at the bottom of existing installation box, thereby reducing the floor area. In addition, voltage transformer and feeder sleeve are connected through mutual inductor suite and connecting sleeve, so that the voltage transformer can measure feeder side voltage.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker gas-filled switchgear technology, and in particular to a circuit breaker gas-filled switchgear for measuring feeder side voltage. Background Technology

[0002] Gas-insulated circuit breakers are high-voltage electrical devices that utilize insulating gases (such as sulfur hexafluoride SF6 or environmentally friendly alternative gases) as arc-extinguishing and insulating media, and are widely used in power systems. In 12kV ring main units, feeder-side voltage transformers need to be installed on the circuit breaker cabinet.

[0003] The existing gas-insulated switchgear is usually installed next to the circuit breaker cabinet with a voltage transformer cabinet. The installation is simple but it occupies the foundation space. Utility Model Content

[0004] Therefore, there is a need to provide a gas-insulated switchgear for measuring feeder side voltage, in order to solve the technical problem that existing gas-insulated switchgear generally involves adding a voltage transformer cabinet next to the circuit breaker cabinet, which is simple to install but occupies foundation space.

[0005] To achieve the above objectives, this utility model provides a circuit breaker gas-filled cabinet for measuring feeder-side voltage, comprising:

[0006] Installation box;

[0007] The gas box is installed on top of the mounting box. A circuit breaker is installed inside the gas box, and a feeder bushing is installed at the bottom of the circuit breaker.

[0008] Voltage transformer, the voltage transformer is installed at the bottom of the mounting box;

[0009] The current transformer kit is installed inside the mounting box and located on one side of the voltage transformer. One end of the current transformer kit is connected to the voltage transformer.

[0010] Connecting bushing, one end of the connecting bushing is connected to the other end of the current transformer kit, and the other end of the connecting bushing is connected to the feeder bushing.

[0011] Unlike existing technologies, the above-mentioned technical solution installs a voltage transformer at the bottom of the existing mounting box, thereby reducing the floor space required. Furthermore, by connecting the voltage transformer to the feeder bushing via a transformer kit and connecting bushing, the voltage transformer can measure the feeder-side voltage.

[0012] As one embodiment of this utility model, the gas-filled switchgear for measuring feeder side voltage also includes a cable, which connects the other end of the current transformer kit to one end of the connecting bushing.

[0013] Thus, the cable's flexibility and ability to bend and twist make it more suitable for internal connections within gas-insulated switchgear. The cable typically has a metallic shielding layer to suppress electric field radiation and external electromagnetic interference, protecting the stability of voltage signal transmission. Furthermore, in case of a fault in the bushing or transformer assembly, the cable can be disconnected and replaced individually, making the process more convenient.

[0014] In one embodiment of this utility model, three feeder bushings are installed at the bottom of the circuit breaker, and three current transformer kits and three connecting bushings are provided. Each feeder bushing corresponds to one current transformer kit and one connecting bushing.

[0015] In this way, the three-phase feeder bushings, transformer kits, and connecting bushings are set up independently, achieving physical and electrical isolation and avoiding phase-to-phase short circuits or electromagnetic interference. In addition, when repairing or replacing the feeder bushings, transformer kits, and connecting bushings of a certain phase, only that phase needs to be shut down, without the need for a complete power outage, reducing the scope and duration of power outages.

[0016] In one embodiment of this utility model, the cross-section of the current transformer kit and the connecting bushing is L-shaped.

[0017] In this way, components in different directions can be connected to the two sides of the L-shape, which facilitates connection and reduces the overall space occupied. The geometric characteristics of the L-shaped cross-section enhance the resistance to bending and torsion, and disperse mechanical stress from feeder bushings or external vibrations (such as the impact of circuit breaker opening and closing). In addition, the L-shaped corners can be equipped with shielding rings or rounded corners (to avoid sharp corners) to uniformly distribute the electric field and reduce partial discharge.

[0018] As one embodiment of this utility model, the circuit breaker gas-filled cabinet for measuring feeder side voltage also includes a connecting bar, which connects the other end of the connecting bushing to the feeder bushing.

[0019] Therefore, connectors are typically made of copper or aluminum, which can carry higher currents and reduce heat loss caused by conductor resistance. Furthermore, the connector, along with the connecting bushing and feeder bushing, works together to prevent surface creepage or breakdown. Optionally, the connector and feeder bushing are fixed by bolting or welding, providing a large and stable contact area and preventing increased resistance and localized overheating due to loosening.

[0020] As one embodiment of this utility model, an inspection door is provided on the side of the mounting box.

[0021] Thus, by setting up an inspection door, it is convenient to install or repair the current transformer kit and connecting bushings installed in the mounting box.

[0022] As one embodiment of this utility model, the circuit breaker gas-filled cabinet for measuring feeder side voltage also includes fasteners, and the voltage transformer is detachably installed at the bottom of the mounting box via the fasteners.

[0023] In this way, the voltage transformer can be detachably mounted at the bottom of the mounting box using fasteners, making it easier to disassemble or repair the voltage transformer. These fasteners can be bolts, studs, screws, etc.

[0024] As one embodiment of this utility model, the circuit breaker gas-filled cabinet for measuring feeder side voltage also includes a mounting base, and the voltage transformer is mounted on the bottom of the mounting box via the mounting base.

[0025] In this way, the mounting base provides rigid support for the voltage transformer, preventing displacement or tilting of the equipment caused by circuit breaker operation vibrations (such as opening and closing impacts) or external vibrations (such as earthquakes or equipment handling), thus ensuring long-term stable operation. Furthermore, the mounting base evenly distributes the weight of the voltage transformer to the bottom of the mounting box, avoiding localized stress concentration and protecting the structural integrity of the mounting box.

[0026] As one embodiment of this utility model, a lockable caster is provided at each of the four corners of the mounting base.

[0027] This makes it easy to move the voltage transformer mounted on the mounting base into the mounting box, and then fix the position of the mounting base in place by locking the casters after it has been moved to the designated position.

[0028] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0029] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0030] In the accompanying drawings of the instruction manual:

[0031] Figure 1 This is a schematic diagram of the structure of a circuit breaker gas-filled cabinet according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the internal structure of a circuit breaker gas-filled cabinet according to an embodiment of this application;

[0033] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0034] Figure 4 This is a schematic diagram of the structure of a voltage transformer according to an embodiment of this application;

[0035] Figure 5 This is a partial schematic diagram of a circuit breaker gas-filled cabinet according to an embodiment of this application.

[0036] The reference numerals used in the above figures are explained as follows:

[0037] 100-Circuit breaker gas-filled cabinet; 1-Installation box; 11-Maintenance door; 2-Gas box; 21-Circuit breaker; 211-Feeder bushing; 3-Voltage transformer; 4-Transformer kit; 5-Connecting bushing; 6-Cable; 7-Connecting bar. Detailed Implementation

[0038] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0039] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0040] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0041] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0042] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0043] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0044] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0045] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0046] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0047] The existing gas-insulated switchgear is usually installed next to the circuit breaker cabinet with a voltage transformer cabinet. The installation is simple but it occupies the foundation space.

[0048] In view of this, this application provides a circuit breaker gas-filled cabinet 100 for measuring feeder side voltage, including a mounting box 1, a gas box 2, a voltage transformer 3, a transformer kit 4, and a connecting bushing 5. The gas box 2 is installed above the mounting box 1, and a circuit breaker 21 is installed inside the gas box 2. A feeder bushing 211 is installed at the bottom of the circuit breaker 21. The voltage transformer 3 is installed at the bottom of the mounting box 1. The transformer kit 4 is installed inside the mounting box 1 and is located on one side of the voltage transformer 3. One end of the transformer kit 4 is connected to the voltage transformer 3. One end of the connecting bushing 5 is connected to the other end of the transformer kit 4, and the other end of the connecting bushing 5 is connected to the feeder bushing 211.

[0049] According to some embodiments of this application, please refer to Figures 1 to 5 This embodiment relates to a circuit breaker gas-filled cabinet 100 for measuring feeder side voltage, including a mounting box 1, a gas box 2, a voltage transformer 3, a transformer kit 4, and a connecting bushing 5. The gas box 2 is installed above the mounting box 1, and a circuit breaker 21 is installed inside the gas box 2. A feeder bushing 211 is installed at the bottom of the circuit breaker 21. The voltage transformer 3 is installed at the bottom of the mounting box 1. The transformer kit 4 is installed inside the mounting box 1 and is located on one side of the voltage transformer 3. One end of the transformer kit 4 is connected to the voltage transformer 3. One end of the connecting bushing 5 is connected to the other end of the transformer kit 4, and the other end of the connecting bushing 5 is connected to the feeder bushing 211.

[0050] The circuit breaker gas-filled cabinet 100 for measuring feeder side voltage also includes an instrument box and a mechanism room. The instrument box and mechanism room are existing structures and will not be described in detail here.

[0051] Gas box 2 is fully enclosed and filled with insulating gas (such as sulfur hexafluoride SF6 or environmentally friendly alternative gases), which can ensure that the internal switches operate under various climatic conditions.

[0052] A voltage transformer is a special type of transformer used in power systems. Its core function is to convert high voltage to low voltage proportionally while maintaining the phase relationship between the primary and secondary voltages to facilitate the connection of measurement, protection, and control equipment.

[0053] The transformer kit 4 is fully shielded and touchable. Connecting the voltage transformer 3 and the bushing 5 through the transformer kit 4 ensures insulation performance and allows operation under various climatic conditions.

[0054] The other end of the connecting sleeve 5 extends into the gas box 2 and connects to the feeder sleeve 211. The connecting sleeve 5 can be made of epoxy resin casting or silicone rubber composite insulation structure to prevent leakage of insulating gas inside the gas box 2.

[0055] The current transformer kit 4 and the connecting bushing 5 are set up separately to facilitate the replacement of damaged parts individually, avoiding the high cost of replacing the whole unit.

[0056] The above technical solution involves installing a voltage transformer 3 at the bottom of the existing mounting box 1, thereby reducing the floor space required. Furthermore, the voltage transformer 3 is connected to the feeder bushing 211 via the transformer kit 4 and the connecting bushing 5, allowing the voltage transformer 3 to measure the feeder-side voltage.

[0057] like Figure 3 and Figure 5 As shown, the circuit breaker gas-filled cabinet 100 for measuring feeder side voltage also includes a cable 6, which connects the other end of the current transformer kit 4 to one end of the connecting bushing 5.

[0058] Thus, cable 6 is flexible and can bend, making it more suitable for internal connections within the gas-insulated switchgear. Cable 6 typically has a metal shielding layer, which suppresses electric field radiation and external electromagnetic interference, protecting the stability of voltage signal transmission. Furthermore, if bushing 5 or transformer kit 4 fails, cable 6 can be disconnected and replaced individually, making the process more convenient.

[0059] like Figure 4 and Figure 5 As shown, three feeder bushings 211 are installed at the bottom of the circuit breaker 21, and three current transformer kits 4 and three connecting bushings 5 ​​are provided. Each feeder bushing 211 corresponds to one current transformer kit 4 and one connecting bushing 5.

[0060] The voltage transformer 3 also has three bushings. Thus, the three-phase feeder bushing 211, transformer kit 4, and connecting bushing 5 are independently installed, achieving physical and electrical isolation and preventing phase-to-phase short circuits or electromagnetic interference. Furthermore, when repairing or replacing the feeder bushing 211, transformer kit 4, or connecting bushing 5 of a specific phase, only that phase needs to be shut down, without requiring a complete power outage, reducing the scope and duration of power outages.

[0061] like Figure 2 , Figure 3 and Figure 5 As shown, the cross-section of the current transformer kit 4 and the connecting bushing 5 is L-shaped.

[0062] In this way, components in different directions can be connected to the two sides of the L-shape, which facilitates connection and reduces the overall space occupied. The geometric characteristics of the L-shaped cross-section can enhance the resistance to bending and torsion, and disperse the mechanical stress from the feeder bushing 211 or external vibrations (such as the impact of the circuit breaker 21 opening and closing). In addition, the L-shaped corners can be equipped with shielding rings or rounded corners (to avoid sharp corners) to uniformly distribute the electric field and reduce partial discharge.

[0063] like Figure 2 and Figure 3 As shown, the circuit breaker gas-filled cabinet 100 for measuring the voltage on the feeder side also includes a connecting strip 7, which connects the other end of the connecting bushing 5 to the feeder bushing 211.

[0064] Therefore, connector 7 is typically made of copper or aluminum, which can carry higher current and reduce heat loss caused by conductor resistance. Furthermore, connector 7 works in conjunction with connector sleeve 5 and feeder sleeve 211 to prevent surface creepage or breakdown. Optionally, connector 7 and feeder sleeve 211 are fixed by bolt crimping or welding, providing a large and stable contact area and preventing increased resistance and localized overheating due to loosening.

[0065] According to some embodiments of this application, optionally, an inspection door 11 is provided on the side of the mounting box 1.

[0066] Thus, by setting up the inspection door 11, it is convenient to install or repair the current transformer kit 4 and the connecting bushing 5 installed in the mounting box 1.

[0067] According to some embodiments of this application, optionally, the circuit breaker gas-filled cabinet 100 for measuring feeder side voltage also includes fasteners, and the voltage transformer 3 is detachably mounted on the bottom of the mounting box 1 by means of fasteners.

[0068] Thus, the voltage transformer 3 can be detachably mounted on the bottom of the mounting box 1 using fasteners, making it easier to disassemble or repair the voltage transformer 3. These fasteners can be bolts, studs, screws, etc.

[0069] According to some embodiments of this application, optionally, the circuit breaker gas-filled cabinet 100 for measuring feeder side voltage also includes a mounting base, and the voltage transformer 3 is mounted on the bottom of the mounting box 1 via the mounting base.

[0070] Thus, the mounting base provides rigid support for the voltage transformer 3, preventing displacement or tilting of the equipment due to vibrations during the operation of the circuit breaker 21 (such as opening and closing impacts) or external vibrations (such as earthquakes or equipment handling), ensuring long-term stable operation. In addition, the mounting base evenly distributes the weight of the voltage transformer 3 to the bottom of the mounting box 1, avoiding local stress concentration and protecting the structural integrity of the mounting box 1.

[0071] According to some embodiments of this application, optionally, a lockable caster is provided at each of the four corners of the mounting base.

[0072] This makes it easy to move the voltage transformer 3, which is mounted on the mounting base, into the mounting box 1, and then fix the position of the mounting base by locking the casters after it has been moved to the designated position.

[0073] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this utility model. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this utility model, or equivalent structural or procedural transformations made using the content of this utility model's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of patent protection for this utility model.

Claims

1. A gas-filled switchgear for measuring feeder-side voltage, characterized in that, include: Installation box; An air box is installed above the mounting box, a circuit breaker is installed inside the air box, and a feeder bushing is installed at the bottom of the circuit breaker; A voltage transformer, wherein the voltage transformer is installed at the bottom of the mounting box; A current transformer kit is installed inside the mounting box and located on one side of the voltage transformer, with one end of the current transformer kit connected to the voltage transformer; A connecting bushing is provided, one end of which is connected to the other end of the current transformer assembly, and the other end of which is connected to the feeder bushing.

2. The gas-filled switchgear for measuring feeder-side voltage according to claim 1, characterized in that, The circuit breaker gas-filled cabinet for measuring feeder side voltage also includes a cable that connects the other end of the current transformer kit to one end of the connecting bushing.

3. The gas-filled switchgear for measuring feeder-side voltage according to claim 1, characterized in that, The bottom of the circuit breaker is equipped with three feeder bushings, and three current transformer kits and three connecting bushings are provided. Each feeder bushing corresponds to one current transformer kit and one connecting bushing.

4. The gas-filled switchgear for measuring feeder-side voltage according to claim 1, characterized in that, The cross-section of the current transformer kit and the connecting bushing is L-shaped.

5. The gas-filled switchgear for measuring feeder-side voltage according to claim 1, characterized in that, The circuit breaker gas-filled cabinet for measuring feeder side voltage also includes a connecting bar, which connects the other end of the connecting bushing to the feeder bushing.

6. The gas-filled switchgear for measuring feeder-side voltage according to claim 1, characterized in that, The installation box has an inspection door on its side.

7. The gas-filled switchgear for measuring feeder-side voltage according to claim 1, characterized in that, The circuit breaker gas-filled cabinet for measuring feeder side voltage also includes fasteners, and the voltage transformer is detachably mounted on the bottom of the mounting box via the fasteners.

8. The gas-filled switchgear for measuring feeder-side voltage according to claim 1, characterized in that, The circuit breaker gas-filled cabinet for measuring feeder side voltage also includes a mounting base, and the voltage transformer is mounted on the bottom of the mounting box via the mounting base.

9. The gas-filled switchgear for measuring feeder-side voltage according to claim 8, characterized in that, Each of the four corners of the mounting base is equipped with a lockable caster.

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