Control switching device of circuit breaker, circuit breaker device, power distribution cabinet and method

Abstract

According to the control switching device of the circuit breaker, the circuit breaker device, the power distribution cabinet and the method provided by the invention, the installation and operation of the circuit breaker are effectively simplified through the reasonable configuration of the first functional part and the second functional part and the design of the common contact of the first functional part and the second functional part. The first functional part is responsible for preventing misoperation and ensuring that the control power supply is allowed to be switched on only when a specific safety condition is met, so that the safety of the system is improved. And the second functional component realizes flexible control of the circuit breaker by switching a remote control mode and a local control mode, and meets operation requirements in different scenes. By sharing the two contacts, the wiring number and complexity in the installation process are reduced, and the requirement for punching the equipment panel is lowered, so that the installation steps are simplified, and the installation cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a control switching device of a circuit breaker, a circuit breaker device, a power distribution cabinet and a method. Background Art

[0002] In the control circuit of high-voltage circuit breakers in substations, switch stations, etc., in addition to the switch control handle operating the opening and closing of the circuit, low-voltage electrical components such as five-protection locks and remote local transfer switches need to be connected to the opening and closing circuit to prevent accidents caused by incorrect operation of the switch.

[0003] In the existing circuit breaker control and protection devices, the five-protection lock and the remote local transfer switch are usually installed separately. Although this design can meet the safety and control requirements of equipment operation to a certain extent, it brings many problems in installation and maintenance.

[0004] Specifically, in the prior art, the five-protection lock and the remote local transfer switch need to be installed separately on the switch cabinet door, which not only increases the complexity of the installation process, but also may affect the structural integrity of the switch cabinet. In addition, the wiring of the secondary circuit is relatively complicated, which increases the installation time and the workload of technicians, and is prone to wiring errors or looseness, thereby affecting the overall reliability of the equipment.

[0005] More importantly, since the five-protection lock and the remote local transfer switch are installed separately, this also leads to a large maintenance workload during the operation of the equipment. Maintenance personnel need to check the status of multiple components separately, which increases the difficulty and time cost of maintenance. Therefore, the control switching device in the prior art has high installation complexity and large maintenance workload, which limits the reliability and operating efficiency of the equipment in actual use. Summary of the invention

[0006] In order to overcome the deficiencies in the prior art, the present application provides a control switching device, a circuit breaker device, a distribution cabinet and a method for a circuit breaker, so as to solve the technical problems in the prior art of high installation complexity and large maintenance workload of the control switching device in the control circuit of high-voltage circuit breakers such as substations and switch stations.

[0007] In order to solve the above technical problems, the technical solution adopted in this application is: In a first aspect, the present application provides a control switching device for a circuit breaker, the control switching device comprising: A first functional component, the first functional component is used to prevent misoperation, the first functional component includes a first contact and a second contact, the first contact is used to connect the positive electrode of the control power supply; wherein the first functional component is configured to allow the first contact and the second contact to be turned on when a predetermined condition is met; The second functional component is used to switch between the first mode and the second mode, and the second functional component includes a third contact and a fourth contact, the third contact is used to connect to the remote control module, and the fourth contact is used to connect to the local control module; wherein, when the second functional component is switched to the first mode, the first contact and the third contact are conducted, so that the remote control module can control the opening and closing of the circuit breaker; when the second functional component is switched to the second mode, the second contact and the fourth contact are connected, and when the first functional component meets a predetermined condition, the second contact and the fourth contact are conducted, and the local control module can control the opening and closing of the circuit breaker.

[0008] In a second aspect, the present application provides a control switching method for a circuit breaker, the method comprising: When the second functional component is switched to the first mode, the first contact and the third contact are connected, so that the remote control module can control the opening and closing of the circuit breaker; wherein the second functional component is used to switch between the first mode and the second mode, and the second functional component includes a third contact and a fourth contact, the third contact is used to connect the remote control module, and the fourth contact is used to connect the local control module; When the second functional component switches from the first mode to the second mode, the second contact is connected to the fourth contact; wherein the second contact is configured in the first functional component, the first functional component is used to prevent misoperation, and the first functional component includes a first contact and a second contact; wherein the first contact is used to connect a control power supply; When the first functional component meets a predetermined condition, the second contact and the fourth contact are connected, and the local control module can control the opening and closing of the circuit breaker.

[0009] In a third aspect, the present application provides a circuit breaker device, which includes a control switching device.

[0010] In a fourth aspect, the present application provides a power distribution cabinet, which includes a circuit breaker device.

[0011] Beneficial effects: The present invention effectively simplifies the installation and operation of the circuit breaker through the reasonable configuration of the first functional component and the second functional component and the design of their common contacts. The first functional component is responsible for preventing misoperation and ensuring that the control power supply is allowed to be turned on only when specific safety conditions are met, thereby improving the safety of the system. The second functional component realizes flexible control of the circuit breaker by switching between remote and local control modes, meeting the operation requirements in different scenarios. By sharing two contacts, the number and complexity of wiring during the installation process are reduced, and the need for punching holes in the equipment panel is reduced, thereby simplifying the installation steps and reducing the installation cost. In addition, due to the optimized design of the connection points and circuits, the maintenance workload of the system is also significantly reduced, improving the long-term reliability and operating efficiency of the equipment. This technical solution effectively solves the problems of high installation complexity and heavy maintenance workload in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 A schematic diagram of a circuit breaker control switching device provided in the related art; Figure 2 A circuit diagram of a circuit breaker control switching device provided in the related art; Figure 3 A schematic diagram of a circuit breaker control switching device provided in the related art; Figure 4 A schematic diagram of a control switching device for a circuit breaker provided in this embodiment; Figure 5 A schematic diagram of a control system provided in this embodiment and provided with the control switching device; Figure 6 A schematic diagram of a control system provided in this embodiment and provided with the control switching device; Figure 7 A schematic flow chart of a control switching method for a circuit breaker provided in this embodiment. DETAILED DESCRIPTION

[0013] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0014] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0015] In related technologies, such as Figure 1 As shown, Figure 1 A circuit breaker control switching device is provided, which may include: five-protection contacts, remote local conversion contacts, closing contacts and opening contacts, remote closing contacts and remote opening contacts, a control device and a circuit breaker mechanism.

[0016] Five-protection contact, this module can be a five-protection lock. As an important safety device to prevent misoperation, the five-protection lock is connected to the control circuit to ensure that the operator can close or open the switch only under appropriate conditions. The function of the five-protection contact is to ensure that specific protection measures are in place to prevent unauthorized or misoperation when the equipment needs to be operated. The five-protection contact can be connected to the positive pole of the power supply.

[0017] Remote local transfer contact, the function of this module is to allow switching between the two operating modes of "remote" and "local". In remote mode (for example, it can be remotely operated by the dispatch center or control room), the control circuit allows remote operation of the circuit breaker to close or open. In local mode, the operation of the equipment needs to be directly controlled by the operator on site. This mode can be used in equipment maintenance or emergency situations. The remote local transfer contact can also be connected to the positive pole of the power supply.

[0018] The closing contact and the opening contact are used to actually execute the closing or opening operation of the circuit breaker. When the closing contact is closed, the closing circuit is turned on and the circuit breaker is closed. When the opening contact is closed, the opening circuit is turned on and the circuit breaker is opened.

[0019] The remote closing contact and remote opening contact are used to remotely control the closing and opening operations of the circuit breaker. These two contacts are associated with the remote control function. In the remote mode, the control center performs the operation by closing these contacts.

[0020] The control and protection device is the core module, which can receive signals from different contacts and determine the operation of the circuit breaker (closing or opening). It can execute corresponding control commands according to input signals (from five-protection locks, remote local transfer switches, closing or opening contacts, etc.).

[0021] The circuit breaker mechanism is the final execution module, which executes the physical closing or opening action of the circuit breaker through the received instructions. The circuit breaker mechanism is connected to the negative pole of the power supply.

[0022] like Figure 2 As shown, based on a circuit breaker control protection device provided, a circuit structure of a circuit breaker control switching device is provided. The circuit structure specifically includes: +KM, -KM, DK, five-protection lock, remote local handle, opening and closing handle, YH (remote closing contact), YT (remote opening contact).

[0023] +KM, -KM, are used to provide power to the entire control circuit, where +KM is the positive pole of the power supply and -KM is the negative pole of the power supply.

[0024] DK is used to control the on and off of the power supply.

[0025] Five-protection lock: When the five-protection lock is in the proper state, contacts 1 and 2 are closed, allowing the control circuit to work normally. The function of the five-protection lock is to prevent unauthorized operation and ensure safety during maintenance or special operations.

[0026] The remote local handle includes contacts 3 and 4, as well as contacts 5 and 6. When the remote local handle is in the "local" position, contacts 3 and 4 are closed, allowing local operation of the circuit breaker. When the remote local handle is in the "remote" position, contacts 5 and 6 are closed, allowing remote operation of the circuit breaker.

[0027] The opening and closing handle includes contacts 7 and 8, and contacts 9 and 10. When the opening and closing handle is in the closing position, contacts 7 and 8 are closed, allowing the closing operation. When the opening and closing handle is in the opening position, contacts 9 and 10 are closed, allowing the opening operation.

[0028] YH (remote closing contact) is a normally open contact used for remote closing. When a closing command is received, the YH contact closes, the closing circuit is turned on, and the circuit breaker performs the closing operation.

[0029] YT (remote trip contact) is a normally open contact used for remote tripping. When a tripping command is received, the YT contact closes, the tripping circuit is turned on, and the circuit breaker performs the tripping operation.

[0030] like Figure 3 As shown, a schematic diagram of the appearance of a circuit breaker control switching device is provided. Figure 3 The internal structure of a circuit breaker control switching device shown in FIG. Figure 2 As shown, the details are not repeated here.

[0031] The circuit breaker control switching device provided above, first of all, often needs to punch holes in the switch cabinet door to install the five-protection lock and the remote local transfer switch. This not only increases the installation time, but may also affect the structural integrity of the switch cabinet. The wiring of the secondary circuit is more complicated, requiring additional time and technicians to handle, and is prone to wiring errors or loose wiring, thus affecting the reliability of the system. Then, since the five-protection lock is separated from the remote local transfer switch, maintenance work needs to check the status of these components separately, increasing the maintenance workload. The high complexity of the wiring means that during the use of the equipment, when any fault occurs or when components need to be replaced, maintenance personnel need to spend more time to find and repair the problem. Finally, since the five-protection lock and the remote local transfer switch are distributed in different locations, the space utilization rate of the switch cabinet panel is low, which limits the arrangement of other components, especially in environments with limited space.

[0032] Therefore, in summary, there is a need for a circuit breaker control switching device that can reduce the number of holes punched in a switch cabinet door during equipment installation, reduce secondary circuit wiring, and reduce the maintenance workload during equipment use.

[0033] like Figure 4 As shown, this embodiment provides a control switching device for a circuit breaker, and the control switching device may include: A first functional component, the first functional component is used to prevent misoperation, the first functional component includes a first contact and a second contact, the first contact is used to connect the positive pole of the control power supply; wherein the first functional component is configured to allow the first contact and the second contact to be conductive when a predetermined condition is met.

[0034] In this embodiment, the first functional component may be a five-protection lock or a key interlock device. Specifically, the five-protection lock is a safety interlock device that can prevent accidents caused by misoperation. The five-protection lock ensures that operations can only be performed under specific conditions by mechanical or electrical means, thereby ensuring the safety of equipment and personnel. The key interlock device is a safety device that can prevent unauthorized or non-compliant operations. The device requires a specific key or tool to unlock, thereby allowing the contact to be turned on or the device to operate.

[0035] In this embodiment, the prevention of misoperation may be to prevent the circuit breaker from being pulled or closed incorrectly due to violation of the operating procedure. The prevention of misoperation may also be to prevent unauthorized personnel from operating. In some embodiments, the first functional component may also be a safety relay or a safety switch, etc.

[0036] The second functional component is used to switch between the first mode and the second mode, and the second functional component includes a third contact and a fourth contact, the third contact is used to connect to the remote control module, and the fourth contact is used to connect to the local control module; wherein, when the second functional component is switched to the first mode, the first contact and the third contact are conducted, so that the remote control module can control the opening and closing of the circuit breaker; when the second functional component is switched to the second mode, the second contact and the fourth contact are connected, and when the first functional component meets a predetermined condition, the second contact and the fourth contact are conducted, and the local control module can control the opening and closing of the circuit breaker.

[0037] In this embodiment, the second functional component is a remote local conversion handle, a mode selection switch or a multifunctional conversion switch. Specifically, the remote local conversion handle is used to select the device operation mode, and can be installed on the electrical equipment or control panel to switch between remote control and local manual operation. When the handle is set to the remote mode (first mode), the operation right of the equipment is handed over to the remote control center or the remote operation system, and the operator cannot directly operate the equipment on site. When the handle is set to the local mode (second mode), the operation right of the equipment is handed over to the on-site operator, and the remote control system cannot operate the equipment. This mode can be used when the equipment needs to be repaired, maintained or debugged on site. The mode selection switch is a multi-position switch for selecting between different operating modes or functions. It can switch between multiple predefined operating modes, such as automatic mode, manual mode, remote mode, etc. The multifunctional conversion switch is a switching device that can switch between multiple operating modes or functions, and can have multiple switch positions, each position corresponding to a different function or mode.

[0038] In this embodiment, the first mode may be expressed as a remote mode, and the second mode may be expressed as a local mode.

[0039] In this embodiment, the installation and operation of the circuit breaker are effectively simplified through the reasonable configuration of the first functional component and the second functional component and the design of their common contacts. The first functional component is responsible for preventing misoperation and ensuring that the control power supply is allowed to be turned on only when specific safety conditions are met, thereby improving the safety of the system. The second functional component realizes flexible control of the circuit breaker by switching between remote and local control modes, meeting the operation requirements in different scenarios. By sharing two contacts, the number and complexity of wiring during the installation process are reduced, and the need to punch holes in the equipment panel is reduced, thereby simplifying the installation steps and reducing the installation cost. In addition, due to the optimized design of the connection points and circuits, the maintenance workload of the system is also significantly reduced, which improves the long-term reliability and operation efficiency of the equipment. This technical solution effectively solves the problems of high installation complexity and heavy maintenance workload in the prior art.

[0040] In some embodiments, the first functional component and the second functional component are integrated into the same housing.

[0041] In this embodiment, the first functional component and the second functional component are integrated in the same housing, which can significantly reduce the installation space and wiring complexity, while improving the overall reliability and maintenance convenience of the device. Through the integrated design, not only the number of external wiring is reduced, the risk of failure due to wiring errors is reduced, but also the installation and debugging process of the system is simplified, and the safety and operating efficiency of the device are improved. In addition, the integrated design helps to improve the anti-interference ability and environmental adaptability of the device, thereby extending the service life of the system.

[0042] In some embodiments, the first functional component is a five-protection lock or a key interlocking device.

[0043] In this embodiment, the first functional component is a five-protection lock or a key interlocking device. The unique design of the five-protection lock can effectively prevent misoperation in the power system, ensuring that operations can only be performed when specific safety conditions are met, thereby greatly improving the safety and reliability of the system. The five-protection lock prevents potential dangerous operations such as misclosing, misopening, and misoperation of the grounding wire under power through a strict interlocking mechanism, reducing equipment failures and safety accidents caused by operational errors. At the same time, the use of the five-protection lock also simplifies the operator's workflow, ensures safety in complex operating scenarios, and effectively protects the safety of equipment and personnel.

[0044] In some implementations, when the first functional component is a five-protection lock, the predetermined condition is that the five-protection lock is correctly unlocked.

[0045] In some embodiments, the second functional component is a remote local conversion handle, a mode selection switch or a multi-function conversion switch.

[0046] In this embodiment, the second functional component is a remote local conversion handle, which can realize flexible switching between remote control and local operation, effectively ensuring the safety and controllability of power equipment in different operating environments. The remote local conversion handle allows the operator to switch control to the local during on-site maintenance, debugging or emergency handling, thereby avoiding operational conflicts or delays that may be caused by remote control. At the same time, during normal operation, control can be switched back to the remote control to ensure unified management of the equipment by the central control system. This design not only improves the convenience and flexibility of operation, but also ensures the reliability and safety of the system in various operating modes. It is very suitable for complex power systems that require frequent switching of control modes.

[0047] In some embodiments, the remote control module includes: Remote closing contact, used to receive remote closing signal and control the closing operation of the circuit breaker; Remote opening contact, used to receive remote opening signal and control the opening operation of the circuit breaker; The measurement and control device is used to send a remote closing signal to the remote closing contact and send a remote opening signal to the remote opening contact.

[0048] In some embodiments, the local control module is a closing and opening handle, and the closing and opening handle includes: a closing contact and an opening contact; wherein, when the handle is turned to the closing position, the closing contact is conductive, and when the handle is turned to the opening position, the opening contact is conductive.

[0049] In some embodiments, the remote control module and the local control module are connected to a circuit breaker connected to a negative pole of a control power source.

[0050] like Figure 5 and Figure 6 As shown, in a possible specific implementation, a control system equipped with the control switching device is provided. In the control system, the control switching device can reduce the number of holes punched in the switch cabinet door during equipment installation, reduce secondary circuit wiring, and reduce the maintenance workload during equipment use.

[0051] The five-protection lock and the remote local conversion handle are integrated into one module, connected by internal fixed lines, reducing the control positive pole +KM and contact wiring, simplifying external wiring, and saving the use area of ​​the switch cabinet panel.

[0052] In the figure, +KM is the control positive pole, -KM is the control negative pole, DK is the DC control power circuit breaker, YH is the remote control closing normally open contact, and YT is the remote control opening normally open contact.

[0053] When the equipment is operating normally, the DC control power circuit breaker DK is closed, the remote local handle is in the remote position, and contacts 1 and 3 are connected. At this time, the control center and the main control room in the station can remotely operate the circuit breaker to open and close. When the remote control is closed, the YH contact is closed, +KM is connected to the closing circuit, and the circuit breaker mechanism is closed. When the remote control is opened, the YT contact is turned on, +KM is connected to the opening circuit, and the circuit breaker mechanism is opened. The circuit breaker mechanism is connected to the negative pole of the power supply.

[0054] During equipment maintenance or emergency handling, the remote local handle is switched to the local position, and contacts 2 and 4 are connected. In order to prevent accidental opening and closing during local operation, the circuit can be turned on only when the five-protection locks 1 and 2 are turned on. The five-protection locks have corresponding unlocking tools, which are kept by special personnel to prevent maintenance personnel from pulling and closing the circuit breaker alone. When the five-protection locks 1 and 2 are turned on and the remote local handle is in the local position, contacts 2 and 4 are turned on. At this time, the switch can be opened and closed through the opening and closing handle on the switch cabinet door. When the handle is in the closing position, 5 and 6 are turned on, the closing circuit is turned on, and the circuit breaker mechanism is closed. When the handle is in the opening position, 7 and 8 are turned on, the opening circuit is turned on, and the circuit breaker mechanism is opened.

[0055] The control switching device can be used to replace the five-protection lock and the remote local conversion handle installed on the original switch cabinet door, reducing the number of holes punched in the switch cabinet door due to installation components. External wiring is reduced. The current situation requires 6 contacts, and this implementation requires 4 contacts, which reduces the workload. The current +KM passes through the air switch and contact 1, +KM passes through the air switch and contact 5, and 3 connections are required between contact 2 and contact 3. This implementation only requires 1 connection between +KM and contact 1, which reduces the control circuit wiring and reduces costs. The reduction in the number of holes and connections also reduces the workload during equipment installation. After the equipment is put into operation, maintenance personnel need to check whether the wiring is firm during maintenance. Since the number of connections between the terminal and the wire is reduced, the workload of maintenance personnel is also reduced. The number of openings and components on the cabinet door is reduced, and the overall firmness of the cabinet door is also slightly improved.

[0056] like Figure 7 As shown, this embodiment provides a control switching method for a circuit breaker, the method comprising: Step S102: When the second functional component is switched to the first mode, the first contact and the third contact are connected, so that the remote control module can control the opening and closing of the circuit breaker; wherein the second functional component is used to switch between the first mode and the second mode, and the second functional component includes a third contact and a fourth contact, the third contact is used to connect to the remote control module, and the fourth contact is used to connect to the local control module; Step S104: When the second functional component switches from the first mode to the second mode, the second contact is connected to the fourth contact; wherein the second contact is configured in the first functional component, the first functional component is used to prevent misoperation, the first functional component includes a first contact and a second contact; wherein the first contact is used to connect a control power supply; Step S106: When the first functional component meets a predetermined condition, the second contact and the fourth contact are connected, and the local control module can control the opening and closing of the circuit breaker.

[0057] This embodiment provides a circuit breaker device, which includes any one of the control switching devices in the above embodiments.

[0058] This embodiment provides a power distribution cabinet, which includes a circuit breaker device as described in the above embodiment.

[0059] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A control switching device for a circuit breaker, characterized in that: The control switching device comprises: A first functional component, the first functional component is used to prevent misoperation, the first functional component includes a first contact and a second contact, the first contact is used to connect the positive electrode of the control power supply; wherein the first functional component is configured to allow the first contact and the second contact to be turned on when a predetermined condition is met; The second functional component is used to switch between the first mode and the second mode, and the second functional component includes a third contact and a fourth contact, the third contact is used to connect to the remote control module, and the fourth contact is used to connect to the local control module; wherein, when the second functional component is switched to the first mode, the first contact and the third contact are conducted, so that the remote control module can control the opening and closing of the circuit breaker; when the second functional component is switched to the second mode, the second contact and the fourth contact are connected, and when the first functional component meets a predetermined condition, the second contact and the fourth contact are conducted, and the local control module can control the opening and closing of the circuit breaker.

2. The control switching device according to claim 1, characterized in that: The first functional component and the second functional component are integrated in the same housing.

3. The control switching device according to claim 1, characterized in that: The first functional component is a five-protection lock or a key interlocking device.

4. The control switching device according to claim 3, characterized in that: In the case where the first functional component is a five-protection lock, the predetermined condition is that the five-protection lock is correctly unlocked.

5. The control switching device according to claim 1, characterized in that: The second functional component is a remote local conversion handle, a mode selection switch or a multi-function conversion switch.

6. The control switching device according to claim 1, characterized in that: The remote control module comprises: Remote closing contact, used to receive remote closing signal and control the closing operation of the circuit breaker; Remote opening contact, used to receive remote opening signal and control the opening operation of the circuit breaker; The measurement and control device is used to send a remote closing signal to the remote closing contact and send a remote opening signal to the remote opening contact.

7. The control switching device according to claim 1, characterized in that: The local control module is a closing and opening handle, which includes: a closing contact and an opening contact; when the handle is turned to the closing position, the closing contact is conductive, and when the handle is turned to the opening position, the opening contact is conductive.

8. A circuit breaker device, characterized in that: The circuit breaker device comprises a control switching device as claimed in any one of claims 1-7.

9. A power distribution cabinet, characterized in that: The power distribution cabinet comprises a circuit breaker device as claimed in claim 8.

10. A control switching method for a circuit breaker, characterized in that: The method comprises: When the second functional component is switched to the first mode, the first contact and the third contact are connected, so that the remote control module can control the opening and closing of the circuit breaker; wherein the second functional component is used to switch between the first mode and the second mode, and the second functional component includes a third contact and a fourth contact, the third contact is used to connect the remote control module, and the fourth contact is used to connect the local control module; When the second functional component switches from the first mode to the second mode, the second contact is connected to the fourth contact; wherein the second contact is configured in the first functional component, the first functional component is used to prevent misoperation, and the first functional component includes a first contact and a second contact; wherein the first contact is used to connect the positive electrode of the control power supply; When the first functional component meets a predetermined condition, the second contact and the fourth contact are connected, and the local control module can control the opening and closing of the circuit breaker.

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