Device and method for determining the status of micro switches in vacuum circuit breakers

Abstract

This application discloses a device and method for determining the state of a microswitch in a vacuum circuit breaker. The device includes a resistance sampling module, an action counting module, a jitter monitoring module, a current sensor, and a microcontroller. The resistance sampling module collects the contact resistance at the microswitch contact location, which is situated within the control circuit. The action counting module acquires the number of actions of the microswitch's mechanical lever. The jitter monitoring module collects voltage fluctuation signals during the closing and / or opening of the microswitch contacts. The current sensor monitors the circuit current in the control circuit. The microcontroller determines the switching state of the microswitch based on at least one of the contact resistance, the number of actions, the voltage fluctuation signal, and the circuit current. This application embodiment can determine the state of the microswitch connected to the control circuit in real time based on the above device when a disconnection signal occurs in the control circuit.

Description

Technical Field

[0001] This application relates to the field of power equipment, and includes, but is not limited to, a device and method for determining the state of a micro switch in a vacuum circuit breaker. Background Technology

[0002] In the control circuit of a 10kV vacuum circuit breaker, the microswitch is a key component for switching the control circuit on and off. Currently, when a disconnection signal occurs in the control circuit, only a general alarm of "control circuit disconnection" can be reported, which cannot distinguish whether it is caused by a damaged microswitch. According to statistics, control circuit abnormalities caused by poor secondary wiring contact or mechanical damage to the microswitch account for more than 40%, but switch maintenance personnel need to check each item on-site, which takes an average of more than 1.5 hours, seriously affecting the efficiency of fault handling and the reliability of power supply. Summary of the Invention

[0003] In view of this, the vacuum circuit breaker micro switch state determination device and method provided in the embodiments of this application are implemented as follows: One aspect of this application provides a device for determining the state of a micro switch in a vacuum circuit breaker, the device comprising: It includes a resistance sampling module, an action counting module, a jitter monitoring module, a current sensor, and a microcontroller; The resistance sampling module is used to collect the contact resistance at the position of the micro switch contact, which is located in the control circuit. The action counting module is used to obtain the number of times the micro switch mechanical lever is activated; The jitter monitoring module is used to collect voltage fluctuation signals during the closing and / or opening of micro switch contacts; A current sensor is used to monitor the loop current of a control circuit. A microcontroller is used to determine the switching state of a microswitch based on at least one of contact resistance, number of actuations, voltage fluctuation signal, and loop current.

[0004] In one possible implementation, the resistance sampling module is connected in series with the micro-motion contact circuit; The action counting module is located near the mechanical lever of the micro switch; The vibration monitoring module is connected in parallel with the micro switch; The current sensor is connected in series in the control loop.

[0005] In one possible implementation, the device further includes a status output module. The status output module is used to output the switching status determined by the microcontroller.

[0006] In one possible implementation, the device further includes a status display module. The status display module is used to display the switching status determined by the microcontroller.

[0007] In one possible implementation, the switching states of the micro switch include a normal state, a risk state, and at least one abnormal state.

[0008] In one possible implementation, the status display module includes multiple LEDs of different colors, each LED representing a switch state.

[0009] In one possible implementation, the action counting module is a Hall sensor or a photoelectric sensor.

[0010] In one possible implementation, the device also includes a power supply module; The power supply module is used to power the resistance sampling module, action counting module, jitter monitoring module and microcontroller.

[0011] Another aspect of this application embodiment provides a method for determining the state of a micro switch in a vacuum circuit breaker, used in the aforementioned device, the method comprising: The contact resistance at the micro switch contact position, the number of times the micro switch mechanical lever moves, and the voltage fluctuation signal at the micro switch contact position are collected in real time through the resistance sampling module, the action counting module, and the jitter monitoring module, respectively. The loop current of the control circuit is monitored in real time using a current sensor. The microcontroller determines the switching state of the microswitch based on at least one of the following: contact resistance, number of actuations, voltage fluctuation signal, and loop current.

[0012] In one possible implementation, the switching state of the microswitch is determined by a microcontroller based on at least one of contact resistance, number of actuations, voltage fluctuation signal, and loop current, including: If the contact resistance is greater than the first resistance threshold and the loop current is less than the first current threshold, the switching state of the microcontroller is determined to be poor contact. If the contact resistance is less than the second resistance threshold and the loop current is greater than the second current threshold, the switching state of the microcontroller is determined to be short-circuit burnout. If the duration of the jitter represented by the voltage fluctuation signal is greater than the time threshold, the switching state of the microcontroller is determined to be contact jitter caused by mechanical wear. If the number of actions exceeds the preset lifespan threshold, the microcontroller's on / off state is determined to be at the end of its lifespan.

[0013] In this embodiment, the device includes a resistance sampling module, an action counting module, a jitter monitoring module, a current sensor, and a microcontroller. The resistance sampling module collects the contact resistance at the location of the microswitch contacts, which are situated within the control loop. The action counting module acquires the number of actions of the microswitch's mechanical lever. The jitter monitoring module collects voltage fluctuation signals during the closing and / or opening of the microswitch contacts. The current sensor monitors the loop current of the control loop. The microcontroller determines the switching state of the microswitch based on at least one of the contact resistance, the number of actions, the voltage fluctuation signal, and the loop current. This embodiment enables real-time determination of the state of the microswitch connected to the control loop based on the aforementioned device when a disconnection signal occurs in the control loop. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This diagram shows a structural schematic of a vacuum circuit breaker micro switch state determination device according to an embodiment of this application; Figure 2 A schematic diagram of another vacuum circuit breaker microswitch status determination device according to an embodiment of this application is shown. Figure 3 A schematic diagram illustrating an application scenario of a vacuum circuit breaker micro switch status determination device according to an embodiment of this application is shown. Figure 4 A flowchart is shown for a method for determining the state of a microswitch in a vacuum circuit breaker according to an embodiment of this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0018] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0019] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0020] The vacuum circuit breaker microswitch status judgment device of this application embodiment can be used to diagnose the status of microswitches in 10kV vacuum circuit breakers used in power systems. This diagnostic process can occur during normal equipment operation, at the moment of microswitch actuation, or when parameters exceed limits. The conditions for triggering the diagnosis can be set as needed. This process can be applied to any application scenario requiring diagnosis of the microswitch status of vacuum circuit breakers. For example, it can diagnose the microswitch status of urban distribution network substations in power grid transmission and distribution scenarios, or diagnose the microswitch status of locations with high power supply reliability requirements, such as large data centers or semiconductor factories.

[0021] Currently, when a 10kV vacuum circuit breaker issues a "control circuit disconnection" alarm, the system can only report this general signal. It cannot distinguish whether the disconnection is caused by a damaged microswitch, nor can it detect early abnormalities such as gradual changes in contact resistance, contact bounce, and mechanical jamming that occur before the microswitch fails. Traditional detection methods lack the ability to integrate and evaluate electrical and mechanical parameters, making it impossible to locate specific faulty components or provide early warnings in the early stages of microswitch deterioration. This forces maintenance personnel to conduct item-by-item checks on-site, which takes an average of more than 1.5 hours and heavily relies on post-incident repairs, resulting in poor power supply reliability.

[0022] Therefore, it can be seen that the technical problem solved by the embodiments of this application is how to determine the state of a micro switch in real time and accurately.

[0023] The following describes in detail the vacuum circuit breaker micro switch status determination device and method according to the embodiments of this application, with reference to the accompanying drawings.

[0024] Figure 1 This diagram illustrates the structure of a microswitch status determination device for a vacuum circuit breaker according to an embodiment of this application. Figure 1 As shown, the vacuum circuit breaker micro switch status determination device in this embodiment may include a resistance sampling module, an action counting module, a jitter monitoring module, a current sensor, and a microcontroller.

[0025] The system includes: a resistance sampling module for acquiring the contact resistance at the microswitch contact location, which is situated within the control loop; an action counting module for recording the number of actions of the microswitch's mechanical lever; a jitter monitoring module for acquiring voltage fluctuation signals during the microswitch's contact closure and / or opening process; a current sensor for monitoring the loop current in the control loop; and a microcontroller for determining the microswitch's switching state based on at least one of the following: contact resistance, number of actions, voltage fluctuation signal, and loop current.

[0026] In one possible implementation, the contacts of the microswitch in this embodiment are located in the control circuit, while the main body of the microswitch can be located in the energy storage circuit. The microswitch is a position sensor that uses its mechanical contacts to switch between open and closed positions to inform other circuit breakers of their current status. The control circuit is an electrical secondary circuit whose task is to receive operation commands and transmit them to the actuators. The energy storage circuit stores energy for the circuit breaker's opening and closing operations and mainly consists of an energy storage motor and an energy storage spring. During a closing operation, when the circuit breaker is in the open position, the microswitch detects that the spring is not stored and thus connects the energy storage circuit. The energy storage motor rotates, tightening the closing spring. Once the spring is in position, the microswitch cuts off the motor power, and energy storage is complete. The operator issues a closing command, energizing the control circuit. However, due to the microswitch's anti-pumping function, it must be confirmed that the circuit breaker is indeed in the open position before the command can be passed. After the command is passed, the closing coil is energized, releasing the energy of the energy storage spring and pushing the circuit breaker to close. After the circuit breaker is closed, the linkage shaft drives the microswitch to switch contacts. The new position of the microswitch feeds back the current closed state to the control circuit, while preparing for the next trip.

[0027] In some embodiments, the resistance sampling module is connected in series with the micro-switch contact circuit to acquire the contact resistance at the micro-switch contact position in real time using the Kelvin four-wire method. The micro-switch contact circuit is the circuit at the micro-switch contact position. In the normal state of the micro-switch, the contact resistance detected in the closed state approaches 0, and the contact resistance detected in the open state approaches infinity. The action counting module is located near the mechanical lever of the micro-switch, such as a Hall sensor or a photoelectric sensor, to detect the number of mechanical actions performed by the mechanical lever of the micro-switch. The core working principle of this action counting module is to convert the displacement action of the mechanical lever into an electrical pulse signal, which is then counted by the microcontroller. The Hall sensor and the photoelectric sensor detect the mechanical action of the mechanical lever by detecting changes in magnetic field and light, respectively. The jitter monitoring module is connected in parallel with the micro-switch to capture the voltage fluctuation signal obtained by the unstable vibration caused by mechanical wear or foreign objects at the moment of closing or opening of the micro-switch. Its working principle is based on high-speed voltage fluctuation detection and time-domain analysis, specifically by converting the mechanical vibration of the contact into irregular changes in electrical signals. A current sensor is connected in series in the control circuit. This current sensor is used for electrical state sensing. It monitors the current flowing through the control circuit where the micro switch is located in real time based on electromagnetic induction or magnetic field detection.

[0028] Optionally, in the operating state of the vacuum circuit breaker microswitch state determination device of this application embodiment, the contact resistance of the microswitch contact position is collected by a resistance sampling module, the number of actions of the microswitch mechanical lever is obtained by an action counting module, the voltage fluctuation signal during the closing and / or opening process of the microswitch contact is collected by a jitter monitoring module, and the loop current of the control circuit is monitored by a current sensor. Further, the above modules transmit the acquired monitoring data to a microcontroller, which determines the switching state of the microswitch based on at least one of the contact resistance, number of actions, voltage fluctuation signal, and loop current, as well as a preset microswitch state determination rule. The microcontroller can be an integrated ADC and GPIO.

[0029] In some embodiments, the switching state of a microswitch determined by the electronic device may include a normal state, a risk state, and at least one abnormal state. The normal state indicates that the microswitch is functioning normally; the risk state indicates that the microswitch is at risk of damage and requires timely repair or replacement; and the at least one abnormal state indicates that the microswitch is damaged and the cause of the damage. For example, abnormal states may include poor contact, short circuit burnout, mechanical wear, and the end of its lifespan. Optionally, corresponding to the risk state, the abnormal state may also include multiple risk states representing different risks, such as poor contact risk, short circuit risk, wear risk, and aging risk.

[0030] Based on the above technical features, the vacuum circuit breaker micro switch status judgment device of this application can accurately identify control circuit disconnection faults caused by micro switch damage by real-time acquisition and fusion of multi-dimensional feature quantities such as contact resistance, number of actions, contact bounce frequency and circuit current of micro switch, thereby reducing the fault location time from the traditional 1.5 hours to 3 minutes. It can also issue early warnings when early abnormalities such as contact oxidation and mechanical wear occur, realizing the transformation from post-maintenance to condition-based pre-maintenance.

[0031] Figure 2 A schematic diagram of another vacuum circuit breaker microswitch status determination device according to an embodiment of this application is shown. Figure 2 As shown, the vacuum circuit breaker micro switch status judgment device of this application embodiment may further include a resistance sampling module, an action counting module, a jitter monitoring module, a current sensor, a microcontroller, a power supply module, and a status output module.

[0032] The system comprises the following components: a resistance sampling module for acquiring the contact resistance of the microswitch contacts located within the control loop; an action counting module for recording the number of actions of the microswitch's mechanical lever; a jitter monitoring module for acquiring voltage fluctuation signals during the closing and / or opening of the microswitch contacts; a current sensor for monitoring the loop current of the control loop; a microcontroller for determining the switching state of the microswitch based on at least one of the contact resistance, number of actions, voltage fluctuation signals, and loop current; a power supply module for supplying power to any modules requiring power, such as the resistance sampling module, action counting module, jitter monitoring module, and microcontroller, or the status output module. This power supply module can be a supercapacitor-powered module, drawing power from the control loop and outputting 3.3V via DC-DC conversion to power the entire system; and a status output module for outputting the switching state determined by the microcontroller.

[0033] Optionally, in this embodiment, the status output module can be a wireless or wired communication module, used to remotely upload the switch status determined by the microcontroller to a monitoring system. This monitoring system can be deployed on any electronic device such as a computer or mobile terminal, and the switch status of the microswitch can be displayed on the front-end display page of the electronic device. Furthermore, the electronic device can also simultaneously perform risk classification based on the switch status of the microswitch and generate corresponding risk handling plans, which are then displayed to the user through the front-end page.

[0034] Furthermore, the vacuum circuit breaker microswitch status determination device in this embodiment may further include a status display module, which displays the switch status determined by the microcontroller. This status display module can provide a simple and intuitive switch status display using LEDs; that is, the status display module may include multiple LEDs of different colors, each LED representing a switch status. For example, if the status display module uses red, blue, and yellow LEDs, a red LED lighting up indicates a microswitch malfunction, a yellow LED lighting up indicates a potential fault in the microswitch, and a blue LED lighting up indicates a normal microswitch status.

[0035] Based on the above technical features, embodiments of this application can also be conveniently embedded in existing switch cabinets without external power supply by employing supercapacitor self-powering and a compact design, effectively improving the equipment's status sensing capability and power supply reliability. Simultaneously, the status detection results are intuitively displayed to the user through a status transmission module and / or status display module, allowing for timely processing of the microswitches.

[0036] Figure 3 This diagram illustrates an application scenario of a microswitch status determination device for a vacuum circuit breaker according to an embodiment of this application. Figure 3 As shown, in application, the vacuum circuit breaker microswitch status judgment device of this application embodiment is installed in the switch cabinet. It integrates a microcontroller, signal conditioning circuit, and communication interface via a flexible PCB main control board approximately 40×30×1.5mm in size, and this main control board is mounted on the side of the secondary terminal block of the switch cabinet. Simultaneously, a sensor array consisting of a resistance sampling module, an action counting module, a jitter monitoring module, and a current sensor is installed inside the mechanism box. Furthermore, an indicator panel including tri-color LEDs serves as a status display module and is mounted on the observation window inside the cabinet door to display the microswitch status in real time.

[0037] Based on the above technical features, the embodiments of this application achieve localized, compact, and intelligent installation and maintenance. Its advantages are as follows: by using flexible PCBs mounted on the side of the secondary terminal blocks, it does not occupy additional space inside the cabinet; it draws power directly from the control circuit and utilizes supercapacitors for power supply, eliminating the need for an external power source and simplifying wiring; sensors are connected to microswitches nearby, greatly shortening signal transmission distance and ensuring the measurement accuracy of milliohm-level contact resistance; simultaneously, three-color LED indicator lights are embedded in the cabinet door observation window, allowing maintenance personnel to intuitively obtain equipment status without opening the door; the overall design does not require modification of the original secondary circuit, making it particularly suitable for the intelligent transformation of old switchgear, achieving a convenient upgrade from fault diagnosis to status awareness.

[0038] Figure 4A flowchart illustrating a method for determining the state of a microswitch in a vacuum circuit breaker according to an embodiment of this application is shown. Figure 4 As shown, the method for determining the state of a micro switch of a vacuum circuit breaker in this embodiment may include the following steps S10-S30.

[0039] Step S10: The contact resistance at the micro switch contact position, the number of times the micro switch mechanical rod is moved, and the voltage fluctuation signal at the micro switch contact position are collected in real time through the resistance sampling module, the action counting module, and the jitter monitoring module, respectively.

[0040] In one possible implementation, when the microswitch status determination device of the vacuum circuit breaker is in operation, the contact resistance at the microswitch contact position is collected by a resistance sampling module, the number of actions of the microswitch mechanical lever is obtained by an action counting module, and the voltage fluctuation signal during the closing and / or opening process of the microswitch contact is collected by a jitter monitoring module. In other words, the status of the microswitch itself is monitored through these three sensors.

[0041] Step S20: Monitor the loop current of the control loop in real time using a current sensor.

[0042] In one possible implementation, while the microswitch status determination device for the vacuum circuit breaker is in operation, a current sensor is also used to monitor the circuit current of the control circuit. That is, the current in the control circuit containing the microswitch contacts is monitored using a current sensor.

[0043] Step S30: The microcontroller determines the switching state of the micro switch based on at least one of the contact resistance, the number of actions, the voltage fluctuation signal, and the loop current.

[0044] In one possible implementation, after the vacuum circuit breaker micro switch state determination device performs the above steps S10 and S20 through the resistance sampling module, action counting module, jitter monitoring module and current sensor, it transmits the monitoring data obtained by the above modules to the microcontroller, and the microcontroller determines the switching state of the micro switch according to at least one of contact resistance, number of actions, voltage fluctuation signal and loop current, as well as the preset micro switch state determination rules.

[0045] In some embodiments, the microcontroller's preset microswitch state judgment rules may include determining the microcontroller's switching state as poor contact when the contact resistance is greater than a first resistance threshold and the loop current is less than a first current threshold; determining the microcontroller's switching state as short-circuit burnout when the contact resistance is less than a second resistance threshold and the loop current is greater than a second current threshold; determining the microcontroller's switching state as contact bounce caused by mechanical wear when the duration of the jitter represented by the voltage fluctuation signal is greater than a time threshold; and determining the microcontroller's switching state as lifespan expired when the number of operations is greater than a preset lifespan threshold. Simultaneously, if the above abnormalities occur simultaneously with a control loop disconnection signal, it is confirmed that the control loop disconnection is caused by microswitch damage. If none of the above conditions are met, the microswitch's switching state can be determined as normal. Furthermore, these microswitch state judgment rules can be customized according to different microswitch types, usage scenarios, etc.

[0046] In cases where the microswitch status determination device for a vacuum circuit breaker also includes a status transmission module and / or a status display module, the status of the microswitch can be transmitted to other devices for display via the status transmission module. Alternatively, the status display module can directly display the status of the microswitch within the current device.

[0047] In other embodiments, the method for determining the state of a vacuum circuit breaker microswitch can be executed by an electronic device controlling the microswitch state determination device. Specifically, the control process may involve setting the microswitch state determination rules in the microcontroller. Simultaneously, the electronic device can also receive and display the switching state of the microswitch sent by the microswitch state determination device.

[0048] Based on the aforementioned technical features, the vacuum circuit breaker microswitch status judgment method of this application collects and comprehensively processes multi-dimensional characteristic quantities of the microswitch in real time, such as contact resistance, number of operations, contact bounce frequency, and circuit current. This not only accurately distinguishes different fault types such as "contact oxidation," "mechanical bounce," and "lifespan expiration," but also establishes a causal correlation between the abnormal state of the microswitch and the control circuit disconnection signal, thereby accurately locating whether the disconnection is caused by microswitch damage among numerous possible causes. Furthermore, by setting different thresholds and logical rules, this method achieves tiered output of early warning and fault alarms, transforming the traditional "post-fault maintenance" mode into "condition-based pre-maintenance," significantly improving fault diagnosis efficiency and equipment operational reliability.

[0049] It should be understood that although the steps in the above flowcharts are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the above flowcharts may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0050] It should be noted that, in the embodiments of this application, if the microprocessor-implemented method in the above system is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, or the part that contributes to the related technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), magnetic disks, or optical disks. Thus, the embodiments of this application are not limited to any specific hardware and software combination.

[0051] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, phrases such as "in one possible implementation," "in one embodiment," or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.

[0052] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0053] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0054] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple modules or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or modules can be electrical, mechanical, or other forms.

[0055] The modules described above as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules. They may be located in one place or distributed across multiple network units. Some or all of the modules may be selected to achieve the purpose of this embodiment according to actual needs.

[0056] In addition, each functional module in the various embodiments of this application can be integrated into one processing unit, or each module can be a separate unit, or two or more modules can be integrated into one unit; the integrated modules can be implemented in hardware or in the form of hardware plus software functional units.

[0057] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, read-only memory (ROM), magnetic disks, or optical disks.

[0058] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to related technologies, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0059] The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments.

[0060] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0061] The features disclosed in the several method or device embodiments provided in this application can be arbitrarily combined without conflict to obtain new method or device embodiments.

[0062] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for determining the state of a micro switch in a vacuum circuit breaker, characterized in that, It includes a resistance sampling module, an action counting module, a jitter monitoring module, a current sensor, and a microcontroller; The resistance sampling module is used to collect the contact resistance at the position of the micro switch contact, and the contact of the micro switch is located in the control circuit. The action counting module is used to obtain the number of times the micro switch mechanical lever is activated; The jitter monitoring module is used to collect voltage fluctuation signals during the closing and / or opening process of the micro switch contacts; The current sensor is used to monitor the loop current of the control loop; The microcontroller is used to determine the switching state of the micro switch based on at least one of the contact resistance, the number of actuations, the voltage fluctuation signal, and the loop current.

2. The apparatus according to claim 1, characterized in that, The resistance sampling module is connected in series with the micro-motion contact circuit; The action counting module is located near the mechanical lever of the micro switch; The vibration monitoring module is connected in parallel with the micro switch; The current sensor is connected in series in the control loop.

3. The apparatus according to claim 1, characterized in that, The device also includes a status output module. The status output module is used to output the switching status determined by the microcontroller.

4. The apparatus according to claim 1, characterized in that, The device also includes a status display module. The status display module is used to display the switch status determined by the microcontroller.

5. The apparatus according to claim 4, characterized in that, The switching states of the micro switch include normal state, risk state, and at least one abnormal state.

6. The apparatus according to claim 5, characterized in that, The status display module includes multiple LEDs of different colors, each LED representing a switch state.

7. The apparatus according to claim 1, characterized in that, The action counting module is a Hall sensor or a photoelectric sensor.

8. The apparatus according to claim 1, characterized in that, The device also includes a power supply module; The power supply module is used to supply power to the resistance sampling module, the action counting module, the jitter monitoring module, and the microcontroller.

9. A method for determining the state of a micro switch in a vacuum circuit breaker, characterized in that, The method, used in the apparatus according to any one of claims 1-8, comprises: The contact resistance at the micro switch contact position, the number of times the micro switch mechanical lever moves, and the voltage fluctuation signal at the micro switch contact position are collected in real time by the resistance sampling module, the action counting module, and the jitter monitoring module, respectively. The loop current of the control loop is monitored in real time by a current sensor; The microcontroller determines the switching state of the microswitch based on at least one of the contact resistance, the number of actuations, the voltage fluctuation signal, and the loop current.

10. The method according to claim 9, characterized in that, The step of determining the switching state of the microswitch by a microcontroller based on at least one of the contact resistance, the number of actuations, the voltage fluctuation signal, and the loop current includes: If the contact resistance is greater than a first resistance threshold and the loop current is less than a first current threshold, the switching state of the microcontroller is determined to be poor contact. If the contact resistance is less than the second resistance threshold and the loop current is greater than the second current threshold, the switching state of the microcontroller is determined to be short-circuit burnout. If the duration of the jitter represented by the voltage fluctuation signal is greater than a time threshold, the switching state of the microcontroller is determined to be contact jitter caused by mechanical wear. If the number of actions exceeds a preset lifespan threshold, the on / off state of the microcontroller is determined to be at the end of its lifespan.

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