A low voltage switchgear

Abstract

The application discloses a low-voltage switch cabinet for isolating electrified conductor parts and reducing the risk of electric shock. The application comprises a cabinet body, a current transformer, a circuit breaker and an incoming copper bar structure; the current transformer, the circuit breaker and the incoming copper bar structure are arranged in the cabinet body, an independent compartment is arranged in the cabinet body, and the current transformer is fixedly installed in the compartment; the incoming copper bar structure is connected with the circuit breaker, an outgoing copper bar is connected with an output end of the circuit breaker, the outgoing copper bar extends and penetrates from one side of the compartment, penetrates out from the other side after passing through a magnetic core hole of the current transformer.

Description

Technical Field

[0001] This application relates to the field of low-voltage switchgear technology, and more particularly to a low-voltage switchgear. Background Technology

[0002] In low-voltage power distribution systems, outgoing switchgear is responsible for power distribution and control. Current transformers (CTs), as a crucial component within the outgoing switchgear, primarily provide accurate current signals to measuring instruments and protection devices, thereby enabling important functions such as power metering, operation monitoring, and overcurrent protection.

[0003] In traditional low-voltage outgoing switchgear, there are two main ways to install current transformers: one is to use a pressure plate bracket to directly fix the current transformer to the copper busbar at the outgoing end; the other is to install the current transformer on a bracket on the side of the cabinet.

[0004] However, in both installation methods, the live conductors of the copper busbars at the outgoing end and the secondary control cables of the current transformers are mostly exposed inside the cabinet. During daily operation and maintenance, maintenance personnel are very likely to come into direct contact with these live parts, which greatly increases the risk of electric shock. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a low-voltage switch with an independent compartment, which can isolate live conductors and reduce the risk of electric shock.

[0006] The technical solution provided in this application is described below:

[0007] This application provides a low-voltage switchgear, including:

[0008] Cabinet, current transformer, circuit breaker and incoming copper busbar structure;

[0009] The current transformer, the circuit breaker, and the incoming copper busbar structure are all housed in the cabinet. The cabinet has an independent compartment, and the current transformer is fixedly installed in the compartment.

[0010] The incoming copper busbar structure is connected to the circuit breaker, and the output end of the circuit breaker is connected to the outgoing copper busbar. The outgoing copper busbar extends and enters from one side of the compartment, passes through the magnetic core hole of the current transformer, and exits from the other side.

[0011] Optionally, the compartment includes a first mounting plate and a second mounting plate, the two ends of the first mounting plate being connected to the side plate of the cabinet and the incoming copper busbar structure, respectively, and the two ends of the second mounting plate being connected to the side plate of the cabinet and the incoming copper busbar structure, respectively.

[0012] The current transformer is fixedly mounted on the first mounting plate, and the outgoing copper busbar passes through the first mounting plate, the magnetic core hole, and the second mounting plate in sequence.

[0013] Optionally, the first mounting plate and the second mounting plate are arranged in parallel.

[0014] Optionally, an insulating sleeve is provided on the second mounting plate, and the outgoing copper busbar passes through the insulating sleeve.

[0015] Optionally, the insulating sleeve includes an abutment plate and a copper busbar sleeve, the copper busbar sleeve being connected to both sides of the abutment plate, and the abutment plate having a through hole in the center, the through hole communicating with the copper busbar sleeve.

[0016] Optionally, the compartment further includes a cover plate located above and below the current transformer, and the cover plate is connected to the first mounting plate and the second mounting plate respectively.

[0017] Optionally, the first mounting plate has a through hole at the position corresponding to the current transformer.

[0018] Optionally, the current transformer is connected to the first mounting plate by bolts or clips.

[0019] Optionally, the incoming copper busbar structure includes insulating baffles arranged parallel to each other on both sides, a vertical partition between the insulating baffles, an incoming copper busbar, and an insulating cover;

[0020] The vertical partition separates the insulating baffles on both sides to form multiple independent channels;

[0021] The incoming copper busbar is located in the channel, and one end is connected to the circuit breaker;

[0022] The insulating cover covers the outer surface of the insulating baffles on both sides facing away from the circuit breaker and is fixedly connected to the insulating baffles.

[0023] Optionally, the circuit breaker is provided with an insert-type rear panel accessory on its back.

[0024] As can be seen from the above technical solutions, this application has the following beneficial effects:

[0025] In this application, the current transformer, circuit breaker, and incoming copper busbar structure are housed within a cabinet, with an independent compartment within the cabinet. The current transformer is fixedly installed in this compartment. The incoming copper busbar structure is connected to the circuit breaker, and the output terminal of the circuit breaker is connected to an outgoing copper busbar. The outgoing copper busbar extends and enters from one side of the compartment, passes through the magnetic core hole of the current transformer, and exits from the other side of the compartment. This effectively isolates the live conductors of the outgoing copper busbar and the secondary control cables of the transformer. Maintenance personnel cannot directly contact these live parts during daily operation and maintenance, greatly reducing the risk of electric shock and improving the safety of low-voltage switchgear use. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a low-voltage switchgear according to this application;

[0027] Figure 2 This is another structural schematic diagram of a low-voltage switchgear according to this application;

[0028] Figure 3 This is a schematic diagram of one side of a low-voltage switchgear circuit breaker according to this application;

[0029] Figure 4 This is another structural schematic diagram of a low-voltage switchgear according to this application;

[0030] Figure 5 This is a schematic diagram of one side of an insulating bushing in a low-voltage switchgear according to this application;

[0031] In the diagram, cabinet 01, current transformer 02, circuit breaker 03, outgoing copper busbar 04, first mounting plate 05, second mounting plate 06, insulating sleeve 07, abutment plate 08, copper busbar sleeve 09, cover plate 10, through hole 11, insulating baffle 12, vertical partition 13, insulating cover 14, insert-type rear panel accessory 15, incoming copper busbar 16, and incoming copper busbar structure 17. Detailed Implementation

[0032] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0033] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0036] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] The technical problems with two traditional installation methods for current transformers—exposed live conductors on the outgoing copper busbars and exposed secondary control cables within the cabinet—pose a significant increase in the risk of electric shock for maintenance personnel during routine operation and maintenance. This application proposes a low-voltage switchgear that isolates live conductors, reducing the risk of electric shock. The specific structure of this application is described below:

[0038] See Figures 1 to 5 The low-voltage switchgear provided in this application includes:

[0039] Cabinet 01, current transformer 02, circuit breaker 03 and incoming copper busbar structure 17; the current transformer 02, circuit breaker 03 and incoming copper busbar structure 17 are all located inside cabinet 01. Cabinet 01 has an independent compartment. The current transformer 02 is fixedly installed in the compartment. The incoming copper busbar structure 17 is connected to the circuit breaker 03. The output end of the circuit breaker 03 is connected to the outgoing copper busbar 04. The outgoing copper busbar 04 extends and enters from one side of the compartment, passes through the magnetic core hole of the current transformer 02 and exits from the other side.

[0040] Cabinet 01 serves as the frame and outer shell of the entire low-voltage switchgear, providing installation space and physical support for other internal components. The current transformer 02, circuit breaker 03, and incoming copper busbar structure 17 are all fixed inside cabinet 01. Inside cabinet 01, baffles separate the current transformer 02, circuit breaker 03, and incoming copper busbar structure 17. In particular, an independent compartment is set at the location of the current transformer 02. In this embodiment, installing the current transformer 02 in an independent compartment can effectively prevent maintenance personnel from directly contacting the live parts of the current transformer 02, thereby improving safety.

[0041] The incoming copper busbar structure 17 is responsible for introducing electrical energy from the external power supply into the low-voltage switchgear. The incoming copper busbar structure 17 is connected to the input terminal of the circuit breaker 03, and the outgoing copper busbar 04 is connected to the output terminal of the circuit breaker 03. The function of the outgoing copper busbar 04 is to draw the electrical energy, after being controlled and processed by the circuit breaker 03, from inside the switchgear and deliver it to subsequent electrical equipment or circuits. The outgoing copper busbar 04 passes through the core hole of the current transformer 02, enabling the current transformer 02 to accurately measure and monitor the outgoing current.

[0042] The working principle of the low-voltage switchgear of this application is as follows: Electrical energy from an external power source is introduced into the cabinet 01 through the incoming copper busbar structure 17 and connected to the circuit breaker 03. Under normal circumstances, the circuit breaker 03 is in the closed state, and the current flows from the incoming copper busbar structure 17 into the circuit breaker 03, and then flows through the output terminal of the circuit breaker 03 to the outgoing copper busbar 04. The outgoing copper busbar 04 extends and passes through an independent compartment equipped with a current transformer 02, passing through the magnetic core hole of the current transformer 02. In this process, the current transformer 02, based on the principle of electromagnetic induction, proportionally transforms the large current in the outgoing copper busbar 04 into a small current, and transmits the small current signal to the connected measuring instrument to measure the current value. Afterward, the outgoing copper busbar 04 exits from the other side of the compartment, delivering electrical energy to subsequent electrical equipment or circuits.

[0043] In this embodiment, the current transformer 02, circuit breaker 03, and incoming copper busbar structure 17 are arranged inside the cabinet 01. An independent compartment is provided within the cabinet 01, and the current transformer 02 is fixedly installed in this compartment. The incoming copper busbar structure 17 is connected to the circuit breaker 03, and the output end of the circuit breaker 03 is connected to an outgoing copper busbar 04. The outgoing copper busbar 04 extends and enters from one side of the compartment, passes through the magnetic core hole of the current transformer 02, and exits from the other side of the compartment. This effectively isolates the live conductors of the outgoing copper busbar and the secondary control cables of the transformer. Maintenance personnel cannot directly contact these live parts during daily operation and maintenance, greatly reducing the risk of electric shock and improving the safety of the low-voltage switchgear.

[0044] In an optional embodiment, the compartment includes a first mounting plate 05 and a second mounting plate 06. The two ends of the first mounting plate 05 are respectively connected to the side plate of the cabinet 01 and the incoming copper busbar structure 17. The two ends of the second mounting plate 06 are respectively connected to the side plate of the cabinet 01 and the incoming copper busbar structure 17. The current transformer 02 is fixedly mounted on the first mounting plate 05, and the outgoing copper busbar 04 passes through the first mounting plate 05, the magnetic core hole, and the second mounting plate 06 in sequence.

[0045] In this embodiment, the compartment is mainly composed of a first mounting plate 05 and a second mounting plate 06. These two mounting plates, together with the side plate of the cabinet 01 and the incoming copper busbar structure 17, enclose a relatively independent space, providing a place for the installation and operation of components such as the current transformer 02.

[0046] Specifically, the two ends of the first mounting plate 05 are connected to the side plate of the cabinet 01 and the incoming copper busbar structure 17, respectively, thereby enhancing the stability of the first mounting plate 05 within the cabinet 01. The current transformer 02 is fixedly mounted on the first mounting plate 05. With the help of the stability of the first mounting plate 05, the current transformer 02 can be accurately installed in the designated position, ensuring the accuracy of its measurement and operation.

[0047] The connection method of the second mounting plate 06 is similar to that of the first mounting plate 05, and will not be described again here. The second mounting plate 06 and the first mounting plate 05 cooperate with each other to form the boundary of the compartment. It should be noted that after the outgoing copper busbar 04 passes through the magnetic core hole of the current transformer 02, it continues to pass through the second mounting plate 06, and the outgoing copper busbar 04 and the second mounting plate 06 are insulated from each other.

[0048] For this insulated connection, a second mounting plate 06 made of insulating material, such as plastic, can be used; alternatively, insulating material can be wrapped around the outside of the outgoing copper busbar 04 to achieve insulated contact. Similarly, a first mounting plate 05 made of insulating material can also be used.

[0049] In this optional embodiment, the first mounting plate 05 and the second mounting plate 06 are arranged in parallel.

[0050] Based on the insulated connection between the second mounting plate 06 and the outgoing copper busbar 04, please refer to [further details]. Figure 4 In this optional embodiment, an insulating sleeve 07 is provided on the second mounting plate 06, and the outgoing copper busbar 04 passes through the insulating sleeve 07.

[0051] In this embodiment, an insulating sleeve 07 is provided on the second mounting plate 06, and the outgoing copper busbar 04 passes through the insulating sleeve 07. The insulating sleeve 07 can effectively isolate the outgoing copper busbar 04 from the second mounting plate 06, preventing safety accidents caused by leakage, short circuit and other faults, and protecting the personal safety of operation and maintenance personnel during operation and maintenance.

[0052] In this optional embodiment, the insulating sleeve 07 includes an abutment plate 08 and a copper busbar sleeve 09. The copper busbar sleeve 09 is connected to both sides of the abutment plate 08. A through hole is provided in the center of the abutment plate 08, and the through hole communicates with the copper busbar sleeve 09.

[0053] The abutment plate 08 has a through hole in its center. The size of the through hole is designed according to the specifications of the outgoing copper busbar 04 to ensure that the outgoing copper busbar 04 can pass through smoothly. The connection between the abutment plate 08 and the second mounting plate 06 can be a bolt connection, a snap-fit ​​connection, or the like.

[0054] The copper busbar sleeve 09 connects to both sides of the abutment plate 08, and the through holes of the copper busbar sleeve 09 and the abutment plate 08 are connected to form a continuous channel, allowing the outgoing copper busbar 04 to pass through completely. Both the copper busbar sleeve 09 and the abutment plate 08 are made of insulating material, possessing good insulation performance, heat resistance, and mechanical strength. The length of the copper busbar sleeve 09 is designed according to actual needs, providing sufficient insulation distance to ensure effective isolation of the outgoing copper busbar 04 from the surrounding environment under different operating conditions.

[0055] To further form an independent compartment, in this optional embodiment, based on the first mounting plate 05 and the second mounting plate 06, the compartment also includes a cover plate 10, which is located above and below the current transformer 02, and is connected to the first mounting plate 05 and the second mounting plate 06 respectively.

[0056] In this embodiment, each independent compartment is provided with two cover plates 10, which are respectively set above and below the independent compartment. Thus, an independent compartment is formed by the interconnection between the two cover plates 10, the first mounting plate 05, the second mounting plate 06, the side plate of the cabinet 01, and the copper busbar 04 structure.

[0057] In an optional embodiment, the first mounting plate 05 has a through hole 11 at the position corresponding to the current transformer 02. In this embodiment, the size of the through hole 11 is larger than the core hole of the current transformer 02, thereby ensuring that the outgoing copper busbar 04 does not contact the first mounting plate 05.

[0058] In an optional embodiment, the current transformer 02 is connected to the first mounting plate 05 by bolts or clips.

[0059] Please continue reading. Figure 2 In an optional embodiment, the incoming copper busbar structure 17 includes insulating baffles 12 arranged parallel on both sides, a vertical partition 13 located between the insulating baffles 12, an incoming copper busbar 16, and an insulating cover 14; the vertical partition 13 divides the space between the insulating baffles 12 on both sides to form multiple independent channels; the incoming copper busbar 16 is disposed in the channel and one end is connected to the circuit breaker 03; the insulating cover 14 covers the outer surface of the insulating baffles 12 on both sides facing away from the circuit breaker 03 and is fixedly connected to the insulating baffles 12.

[0060] The parallel insulating baffles 12 on both sides can effectively isolate the incoming copper busbar 16 from the external environment and other live or non-live components, preventing safety accidents caused by leakage. It should be noted that the first mounting plate 05 and the second mounting plate 06 are both connected to the insulating baffle 12.

[0061] The vertical partition 13 separates the two insulating baffles 12 to form multiple independent channels. By separating the incoming copper busbars 16 into different channels, mutual interference and short circuit risks between the copper busbars can be avoided.

[0062] The function of the incoming copper busbar 16 is to transmit electrical energy. One end of the incoming copper busbar 16 is connected to the circuit breaker 03, and the other end is usually connected to an external power source or other electrical equipment, introducing the electrical energy from the external power source into the low-voltage switch cabinet to provide power support for subsequent circuit distribution and use.

[0063] The insulating cover 14 covers the outer surface of the insulating baffles 12 on both sides facing away from the circuit breaker 03 and is fixedly connected to the insulating baffles 12, providing an additional insulating protective layer for the entire incoming copper busbar structure 17.

[0064] In an optional embodiment, the back of the circuit breaker 03 is provided with an insert-type rear panel accessory 15.

[0065] In this embodiment, the plug-in rear panel accessory 15 is an additional component designed for flexible installation and removal of the circuit breaker 03. It is installed on the back of the circuit breaker 03 and achieves electrical and mechanical connection with the circuit breaker 03 through a specific plug-in connection method. The plug-in rear panel accessory 15 typically includes multiple functional modules, such as auxiliary contact modules, alarm contact modules, shunt trip modules, undervoltage trip modules, etc.

[0066] Circuit breaker 03 itself mainly has basic protection functions such as overload and short circuit, while plug-in panel accessory 15 can add more functions, such as remote control, status monitoring, and fault alarm, so that circuit breaker 03 can better adapt to the needs of different electrical systems.

Claims

1. A low-voltage switchgear, characterized in that, include: Cabinet, current transformer, circuit breaker and incoming copper busbar structure; The current transformer, the circuit breaker, and the incoming copper busbar structure are all housed in the cabinet. The cabinet has an independent compartment, and the current transformer is fixedly installed in the compartment. The incoming copper busbar structure is connected to the circuit breaker, and the output end of the circuit breaker is connected to the outgoing copper busbar. The outgoing copper busbar extends and enters from one side of the compartment, passes through the magnetic core hole of the current transformer, and exits from the other side.

2. The low-voltage switchgear according to claim 1, characterized in that, The compartment includes a first mounting plate and a second mounting plate. The two ends of the first mounting plate are respectively connected to the side plate of the cabinet and the copper busbar structure. The two ends of the second mounting plate are respectively connected to the side plate of the cabinet and the copper busbar structure. The current transformer is fixedly mounted on the first mounting plate, and the outgoing copper busbar passes through the first mounting plate, the magnetic core hole, and the second mounting plate in sequence.

3. The low-voltage switchgear according to claim 2, characterized in that, The first mounting plate and the second mounting plate are arranged in parallel.

4. The low-voltage switchgear according to claim 2, characterized in that, An insulating sleeve is provided on the second mounting plate, and the outgoing copper busbar passes through the insulating sleeve.

5. The low-voltage switchgear according to claim 4, characterized in that, The insulating sleeve includes an abutment plate and a copper busbar sleeve. The copper busbar sleeve is connected to both sides of the abutment plate. A through hole is provided in the center of the abutment plate, and the through hole communicates with the copper busbar sleeve.

6. The low-voltage switchgear according to claim 2, characterized in that, The compartment also includes a cover plate, which is located above and below the current transformer, and is connected to the first mounting plate and the second mounting plate respectively.

7. The low-voltage switchgear according to any one of claims 2 to 6, characterized in that, The first mounting plate has a through hole at the position corresponding to the current transformer.

8. The low-voltage switchgear according to any one of claims 2 to 6, characterized in that, The current transformer is connected to the first mounting plate by bolts or clips.

9. The low-voltage switchgear according to any one of claims 1 to 6, characterized in that, The incoming copper bus structure includes insulating baffles arranged in parallel on both sides, a vertical partition between the insulating baffles, an incoming copper bus, and an insulating cover. The vertical partition separates the insulating baffles on both sides to form multiple independent channels; The incoming copper busbar is located in the channel, and one end is connected to the circuit breaker; The insulating cover covers the outer surface of the insulating baffles on both sides facing away from the circuit breaker and is fixedly connected to the insulating baffles.

10. The low-voltage switchgear according to any one of claims 1 to 6, characterized in that, The circuit breaker is equipped with an insert-type rear panel accessory on its back.

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