Device and method for measuring action synchronism of vacuum multi-break parallel circuit breaker

Abstract

The invention discloses an action synchronism measuring device and method for a vacuum multi-fracture parallel circuit breaker, and the method comprises the steps: applying a direct-current constant-current power supply to parallel fractures, and installing a Rogowski coil on each parallel branch, so as to detect the sudden change condition of the current of each branch during switching-off and switching-on. The action synchronism of the circuit breaker can be measured and the action sequence of each branch can be determined by analyzing the time point of the sudden change of the current. Specifically, each parallel branch of the vacuum multi-break parallel circuit breaker is provided with a current detection structure, the current detection structures are adopted to induce current abrupt change signals, and the current detection structures are connected with a signal acquisition device and used for analyzing and processing the acquired current abrupt change signals; a direct-current constant-current power supply is applied to the two ends of the vacuum arc extinguish chamber of each branch, and the constant-current power supply is combined to ensure that obvious sudden current change is generated when each branch is switched on or switched off, so that the action time difference of the multi-fracture parallel branch can be accurately measured, and the problem that the synchronism of parallel fractures cannot be effectively measured in the prior art is effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of [field name], specifically relating to a device and method for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker. Background Technology

[0002] Circuit breakers are critical devices in power systems, used to control the connection and disconnection of circuits. Under normal circumstances, they provide a path for power transmission, and in the event of a fault, they quickly cut off the current to protect the power grid and related equipment. Modern high-voltage circuit breakers are widely used in power transmission and distribution systems, substations, industrial equipment, and other fields, and their performance directly affects the safety and stability of the power system.

[0003] As power system voltage levels and short-circuit currents increase, the breaking capacity of a single circuit breaker may no longer meet the demands. Therefore, high-voltage circuit breakers typically employ a multi-break parallel connection to improve current sharing capacity and reduce the breaking burden on individual arc-extinguishing chambers. In this structure, multiple parallel branches share the current, and the arc-extinguishing chambers of each branch open and close simultaneously or nearly simultaneously to ensure reliable circuit switching. In multi-break parallel circuit breakers, slight differences in the mechanical characteristics, contact states, and electrical parameters of each branch can lead to asynchronous operating times, i.e., synchronization issues. Excessive synchronization differences can cause the following problems: uneven current distribution: some branches may break too early or too late, causing current to concentrate in certain branches, affecting equipment lifespan.

[0004] Currently, the main methods for measuring the synchronicity of circuit breakers include: 1) Mechanical synchronicity measurement, which uses travel sensors or high-speed cameras to measure the opening and closing times of the circuit breakers. This method cannot directly reflect the opening and closing status of the circuit breaker's circuit breakers, and is complex to install and highly susceptible to mechanical errors. 2) Electrical synchronicity measurement, which calculates synchronicity by measuring the voltage signals on each branch. This method is suitable for single-break or non-parallel-break circuit breakers, but cannot distinguish the opening times between parallel branches. The method based on the voltage signal applied to each branch typically involves inserting a voltage signal in series into each branch. When the circuit breaker opens or closes, the voltage signal on that branch disappears, and then the opening time of the circuit breaker is determined through waveform analysis to assess synchronicity. However, this method is mainly suitable for single-break or non-parallel-connected circuit breakers. For multi-break parallel circuit breakers, it cannot distinguish the independent opening times of each parallel branch, making accurate measurement of synchronicity difficult. Therefore, existing measurement methods cannot effectively solve the problem of synchronicity measurement for multi-break parallel circuit breakers. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker, thereby solving the problem of the inability of the prior art to effectively measure the synchronicity of multi-break parallel circuit breakers.

[0006] To achieve the above objectives, the present invention employs the following technical solution: The present invention proposes a device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker, comprising a vacuum multi-break parallel circuit breaker, a DC constant current power supply, and a signal acquisition device; Each parallel branch of the vacuum multi-break parallel circuit breaker is equipped with a vacuum interrupter, and each parallel branch is equipped with a current detection structure. The stationary output terminals of the vacuum interrupters at the beginning of all parallel branches are interconnected to form a first common node, and the moving output terminals of the vacuum interrupters at the end of all parallel branches are interconnected to form a second common node. The two ends of the DC constant current power supply are respectively connected to the first common node and the second common node. The current detection structure is connected to the signal acquisition device for analyzing and processing the acquired current change signals.

[0007] Preferably, the current detection structure is a Rogowski coil.

[0008] Preferably, the Rogowski coil is non-contactly mounted on the outside of the conductive rod on the moving or stationary side of the vacuum interrupter in the branch of the vacuum multi-break parallel circuit breaker.

[0009] Preferably, the first common node is electrically connected to the first pole of the DC constant current power supply through a first lead-out sleeve, and the second common node is electrically connected to the second pole of the DC constant current power supply through a second lead-out sleeve.

[0010] Preferably, the output terminal of the signal acquisition device is connected to a waveform display.

[0011] Preferably, each parallel branch of the vacuum multi-break parallel circuit breaker is provided with a vacuum interrupter.

[0012] Preferably, the current value of the DC constant current power supply applied to both ends of the vacuum interrupter is dynamically adjusted according to the rated current of the circuit breaker under test and the number of parallel branches.

[0013] Preferably, the current value is set to 10% to 20% of the rated current of the branch.

[0014] Preferably, the power data of the DC constant current power supply is communicated with the signal acquisition device through an RS485 or Ethernet interface to read the voltage value and power status in real time.

[0015] The present invention proposes a method for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker, comprising the following steps: A DC constant current power supply is applied to multiple parallel branches of the vacuum multi-break parallel circuit breaker, so that the vacuum interrupters connected in series in each branch are under the working voltage; the operating mechanism of the DC constant current power supply is triggered to drive all vacuum interrupters to perform opening or closing actions synchronously; the current change signal generated by the current detection structure during the operation of the vacuum interrupter is collected by the signal acquisition device; the difference of the current change time points of different branches is calculated based on each current change signal, and the synchronicity of the circuit breaker operation and the operation sequence of each branch are determined according to the difference.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention proposes a device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker. A current detection structure is installed in each parallel branch of the vacuum multi-break parallel circuit breaker to sense current changes in real time. A constant DC current power supply is applied to ensure that each branch generates a significant current surge signal when the circuit breaker opens. Using surge point detection technology, the opening time difference of each break is accurately calculated to obtain synchronicity data. The operating sequence of each branch can be analyzed simultaneously, providing a reference for equipment maintenance. Specifically, a current detection structure is installed in each parallel branch of the vacuum multi-break parallel circuit breaker. The current detection structure senses the current surge signal and is connected to a signal acquisition device for analysis and processing of the acquired current surge signal. A constant DC current power supply is applied across the vacuum interrupter of each branch. Combined with the constant current power supply, a significant current surge is ensured when each branch opens or closes, thereby enabling accurate measurement of the operating time difference of the multi-break parallel branches and effectively solving the problem of existing technologies being unable to measure the synchronicity of parallel breaks.

[0017] Furthermore, the Rogowski coil is a coreless, non-contact sensor that does not require modification of the original circuit breaker structure, simplifying the installation process and reducing engineering complexity. The Rogowski coil has high-frequency response characteristics, enabling it to accurately capture microsecond-level current surges. Combined with algorithms to extract these surge points, it avoids mechanical sensor errors and significantly improves the accuracy of time difference measurement.

[0018] Furthermore, the output of the signal acquisition device is connected to a waveform display, which can display the waveform of sudden changes in current in each branch.

[0019] Furthermore, a DC constant current power supply is applied to both ends of the arc-extinguishing chamber of the parallel branch. The current value is dynamically adjusted according to the rated current of the circuit breaker under test and the number of parallel branches. It is usually set to 10% to 20% of the rated current of the branch to ensure that a significant current change signal is generated when the circuit is opened.

[0020] Furthermore, the power data communicates with the signal acquisition device via RS485 or Ethernet interface to read voltage values ​​and power status (such as overload alarms) in real time and record them to a log file for subsequent analysis.

[0021] This invention proposes a method for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker. A constant DC current power supply is applied to multiple parallel branches of the vacuum multi-break parallel circuit breaker, causing the vacuum interrupters connected in series in each branch to operate at their working voltage. The operating mechanism of the constant DC current power supply is triggered, driving all vacuum interrupters to synchronously perform opening or closing actions. A signal acquisition device collects the current mutation signals generated by the current detection structure during the operation of the vacuum interrupters. Based on these current mutation signals, the difference in the time points of current mutations in different branches is calculated. The synchronicity of the circuit breaker's operation and the operating sequence of each branch are determined based on these differences, effectively solving the problem of synchronicity measurement in parallel structures. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram illustrating the principle of measuring the synchronicity of parallel circuit breaker operation according to the present invention.

[0024] Figure 2 This is a circuit diagram of the present invention.

[0025] Figure 3 This is a diagram illustrating the effect of the branch current signal abrupt change starting point in an embodiment of the present invention.

[0026] Figure 4 This is a diagram illustrating the effect of the branch current signal abruptly ending at an embodiment of the present invention.

[0027] Among them, 1-vacuum interrupter; 2-Rogowski coil; 3-DC constant current power supply; 4-signal acquisition device; 5-display. Detailed Implementation

[0028] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The present invention will now be described in further detail with reference to the accompanying drawings: Explanation of technical terms: Vacuum multi-break parallel circuit breaker: This refers to a high-voltage circuit breaker that uses a vacuum interrupter as the breaking medium and has multiple parallel breaks. Its characteristic is that the current is shared by multiple parallel branches, thereby improving breaking capacity and system reliability.

[0034] Synchronization of operation: refers to the consistency of the operating time of each parallel branch of a circuit breaker during the opening or closing process. Good synchronization helps reduce unbalanced current in the power grid and improves system stability.

[0035] Rogowski coil: A coreless current sensor that uses the principle of electromagnetic induction to detect changes in current. It is particularly suitable for measuring rapid current surges, such as the current change at the moment a circuit breaker is opened.

[0036] Signal acquisition device: an electronic device used to acquire the current change signal detected by the Rogowski coil in real time and transmit the data to the analysis system to calculate the synchronicity and operating sequence of the circuit breaker.

[0037] DC constant current power supply: A current source applied to each parallel branch of the circuit breaker, with its direction perpendicular to the main current path. The constant current power supply ensures that each branch generates a measurable current surge signal when the circuit breaker is opened.

[0038] Current abrupt change point: refers to the point on the measured waveform where the current is rapidly cut off or connected when the circuit breaker is opened or closed. By detecting this point, the opening time of each branch can be accurately determined.

[0039] This invention proposes a device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker, such as... Figure 1 and Figure 2 It includes a vacuum multi-break parallel circuit breaker, a DC constant current power supply 3, and a signal acquisition device 4; Each parallel branch of the vacuum multi-break parallel circuit breaker is equipped with at least one vacuum interrupter 1. A current detection structure is installed in each parallel branch. The stationary output terminals of the first vacuum interrupters 1 of all parallel branches are interconnected to form a first common node, and the moving output terminals of the last vacuum interrupters 1 of all parallel branches are interconnected to form a second common node. The two ends of the DC constant current power supply 3 are connected to the first common node and the second common node, respectively. The current detection structure is connected to a signal acquisition device 4 for analyzing and processing the acquired current surge signals. The output terminal of the signal acquisition device 4 is connected to a waveform display 5. A current detection structure is installed in each parallel branch of the vacuum multi-break parallel circuit breaker. This structure senses sudden current changes and is connected to a signal acquisition device 4 for analyzing and processing the acquired signals. A DC constant current power supply 3 is applied across the vacuum interrupter 1 of each branch. This constant current power supply ensures that each branch generates a significant current change when opening or closing, thus enabling accurate measurement of the operating time difference of the multi-break parallel branches and effectively solving the problem of the inability to measure the synchronicity of parallel breaks in existing technologies. The output of the signal acquisition device 4 is connected to a waveform display 5, which displays the current change waveforms of each branch.

[0040] The current detection structure is a Rogowski coil 2, which is non-contactly mounted on the conductive rod of the moving or stationary side of the vacuum interrupter 1 in the branch of the vacuum multi-break parallel circuit breaker. The Rogowski coil 2 is a coreless, non-contact sensor, eliminating the need to damage the original circuit breaker structure, simplifying the installation process, and reducing engineering complexity. The Rogowski coil 2 has high-frequency response characteristics, accurately capturing microsecond-level current surges. Combined with algorithms to extract the surge points, it avoids mechanical sensor errors and significantly improves the accuracy of time difference measurement.

[0041] The first common node is electrically connected to the first pole of the DC constant current power supply 3 through the first lead-out sleeve, and the second common node is electrically connected to the second pole of the DC constant current power supply 3 through the second lead-out sleeve.

[0042] The current value of the DC constant current power supply 3 applied to both ends of the vacuum interrupter 1 is dynamically adjusted according to the rated current of the circuit breaker under test and the number of parallel branches. The current value is set to 10%~20% of the rated current of the branch (e.g., 10A~100A range) to ensure that a significant current change signal is generated when the circuit breaker is opened.

[0043] The stationary output terminals of the first vacuum interrupter 1 of all parallel branches are interconnected to form a first common node, and the moving output terminals of the last vacuum interrupter 1 of all parallel branches are interconnected to form a second common node. The two ends of the DC constant current power supply 3 are connected to the first common node and the second common node, respectively. The DC constant current power supply 3 adopts closed-loop control technology, and monitors the output current in real time through a built-in high-precision current detection structure. Finally, the data is fed back to the controller to ensure that the current fluctuation is less than ±0.5% and improve signal stability.

[0044] The power data of the DC constant current power supply 3 is communicated with the signal acquisition device 4 through RS485 or Ethernet interface. The current value, voltage value and power status are read in real time and recorded to the log file for subsequent analysis.

[0045] Signal excitation and acquisition of a device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker: 1) When the circuit breaker opens or closes, the arc-extinguishing chambers of each parallel branch open or close sequentially, causing a rapid change in the branch current. 2) The Rogowski coil 2, based on the principle of electromagnetic induction, captures the current surge signal and transmits it to the signal acquisition device 4. 3) The acquisition circuit adopts a modular, independent tooling design, separate from the circuit breaker body, and connects to the Rogowski coil 2 of each branch via quick-connect interfaces for easy installation and removal. 4) Each acquisition channel is equipped with an independent signal conditioning circuit (including filtering, amplification, and isolation functions), supporting multi-channel parallel acquisition (e.g., 6 channels or more), and the number of channels can be increased through expansion modules to adapt to the testing needs of circuit breakers with different parallel branch scales. 5) The signal sampling rate is no less than 1MHz, and the resolution reaches 16bit, ensuring accurate capture of microsecond-level current surges.

[0046] like Figure 3 and Figure 4 Sudden change point identification and time stamping: Signal acquisition device 4 records the current waveforms of each branch and uses algorithms to accurately identify the starting point of current sudden changes. and end point Based on the start time of the earliest action fracture point. Using this as a benchmark, calculate the action time difference of other fracture surfaces. .

[0047] Synchronization analysis and action sequence determination: Based on the time difference of each branch, the overall synchronicity of the circuit breaker's operation is evaluated to determine whether it meets the preset synchronization threshold (e.g., microsecond-level difference). Combining the timing of sudden change signals in each branch, the action sequence of each break point is determined, providing data support for equipment commissioning and maintenance.

[0048] Data visualization and output: The results are displayed in a multi-dimensional format, 1) Waveform graph: The waveforms of sudden current changes in each branch are overlaid and labeled. and Location and time difference. 2) Time series table: Lists the time difference of each branch action. And the deviation relative to the benchmark, indicating whether it exceeds the preset threshold (e.g., ±50μs). 3) Statistical charts: Bar charts show the action time distribution of each branch, and heat maps reflect the consistency of synchronicity. 4) Report files: The analysis results are output in the form of waveform graphs, time series tables, etc., intuitively showing the differences in action time of each branch and the overall level of synchronicity. A PDF report is automatically generated, which includes test parameters, raw data, analysis conclusions and recommended measures.

[0049] The present invention proposes a method for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker, comprising the following steps: Step 1: System initialization, power parameter configuration, connection of acquisition fixture, and time reference calibration.

[0050] Step 2: Apply a constant current power supply and start the DC constant current source to ensure that the current in each branch is stable.

[0051] Step 3: Trigger the tripping or closing operation, send the tripping or closing command to the circuit breaker, and simultaneously start signal acquisition.

[0052] Step 4: Signal processing and analysis, extracting the time points of abrupt changes in each branch, calculating the time difference, and determining the sequence of actions.

[0053] Step 5: Output the results to generate a synchronous report and action sequence diagram.

[0054] Specifically, a DC constant current power supply 3 is applied to multiple parallel branches of the vacuum multi-break parallel circuit breaker, so that the vacuum interrupters 1 connected in series in each branch are under the working voltage; the operating mechanism of the DC constant current power supply 3 is triggered to drive all vacuum interrupters 1 to perform opening or closing actions synchronously; the current change signal generated by the current detection structure during the operation of the vacuum interrupter 1 is collected by the signal acquisition device 4; the difference of the current change time points of different branches is calculated based on each current change signal, and the synchronicity of the circuit breaker operation and the operation sequence of each branch are determined according to the difference.

[0055] This invention utilizes Rogowski coil 2 to detect the sudden current surge signal during circuit breaker tripping, directly reflecting the actual breaking time of the circuit breaker and avoiding indirect measurement errors associated with traditional mechanical or voltage methods. By applying a constant current power supply, it ensures that each branch generates a stable and identifiable sudden current surge signal during tripping, providing the necessary conditions for high-precision measurement. Based on dynamic analysis of the start and end points of the surge, combined with the time reference of the earliest tripping circuit breaker, it achieves accurate calculation of the multi-break operation sequence. Through independent branch signal acquisition and processing, it overcomes the limitations of traditional methods on parallel structures, filling the technological gap in the field of synchronicity measurement of multi-break circuit breakers. The synergistic effect of these key points fundamentally solves the problem that existing technologies cannot measure the synchronicity of operation of multi-break parallel circuit breakers, demonstrating significant technological advancement and practical value.

[0056] The proposed solution is specifically designed for vacuum multi-break parallel circuit breakers. Addressing their characteristics of multiple parallel branches and large short-circuit currents, compatibility is achieved through the following optimizations: 1) Power supply adaptability: The constant current source output range is adjustable, supporting different arc-extinguishing chamber withstand voltage levels. 2) Channel expandability: The acquisition fixture supports dynamic expansion of the number of channels, adapting to multi-break parallel structures. 3) Anti-interference design: Shielded cables and digital filtering technology are used to suppress electromagnetic noise under high-voltage environments, ensuring signal purity. 4) Compared to traditional circuit breakers, this solution can accurately distinguish the independent operating sequence of parallel branches, filling the technical gap in synchronous measurement of multi-break structures.

[0057] This invention has the following advantages: 1) High-precision measurement: The Rogowski coil 2 has high-frequency response characteristics, which can accurately capture microsecond-level current surges. Combined with algorithms to extract surge points, it avoids mechanical sensor errors and significantly improves the accuracy of time difference measurement. 2) Applicable to parallel structures: Traditional voltage detection methods cannot distinguish the independent actions of parallel branches. However, this invention directly correlates the breaking time of each break point by detecting current surges in independent branches, effectively solving the problem of synchronicity measurement in parallel structures. 3) Convenient installation: The Rogowski coil 2 is a coreless, non-contact sensor, which does not require damage to the original structure of the circuit breaker, simplifying the installation process and reducing engineering complexity. 4) Real-time performance and reliability: The signal acquisition device 4 and the analysis system process data in real time, enabling online monitoring of the circuit breaker opening process, timely detection of synchronicity deviations, and ensuring the stability of the power grid operation. 5) Strong versatility: By adjusting the parameters of the DC constant current power supply 3, it can adapt to circuit breakers of different voltage levels and current capacities, providing strong scalability.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do 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 device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker, characterized in that, Includes vacuum multi-break parallel circuit breaker, DC constant current power supply and signal acquisition device; Each parallel branch of the vacuum multi-break parallel circuit breaker is equipped with a vacuum interrupter, and each parallel branch is equipped with a current detection structure. The stationary output terminals of the vacuum interrupters at the beginning of all parallel branches are interconnected to form a first common node, and the moving output terminals of the vacuum interrupters at the end of all parallel branches are interconnected to form a second common node. The two ends of the DC constant current power supply are respectively connected to the first common node and the second common node. The current detection structure is connected to the signal acquisition device for analyzing and processing the acquired current change signals.

2. The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker according to claim 1, characterized in that, The current detection structure is a Rogowski coil.

3. The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker according to claim 2, characterized in that, The Rogowski coil is non-contactly mounted on the outside of the conductive rod on the moving or stationary side of the vacuum interrupter in the branch of the vacuum multi-break parallel circuit breaker.

4. The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker according to claim 1, characterized in that, The first common node is electrically connected to the first pole of the DC constant current power supply through the first lead-out sleeve, and the second common node is electrically connected to the second pole of the DC constant current power supply through the second lead-out sleeve.

5. The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker according to claim 1, characterized in that, The output of the signal acquisition device is connected to a waveform display.

6. The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker according to claim 1, characterized in that, Each parallel branch of the vacuum multi-break parallel circuit breaker is equipped with a vacuum interrupter.

7. The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker according to claim 1, characterized in that, The current value of the DC constant current power supply applied to both ends of the vacuum interrupter is dynamically adjusted according to the rated current of the circuit breaker under test and the number of parallel branches.

8. The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker according to claim 7, characterized in that, The current value is set to 10% to 20% of the branch's rated current.

9. The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker according to claim 1, characterized in that, The power data of the DC constant current power supply is communicated with the signal acquisition device through an RS485 or Ethernet interface to read the voltage value and power status in real time.

10. A method for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker, characterized in that, The device for measuring the synchronicity of operation of a vacuum multi-break parallel circuit breaker as described in any one of claims 1 to 9 includes the following steps: A DC constant current power supply is applied to multiple parallel branches of the vacuum multi-break parallel circuit breaker, so that the vacuum interrupters connected in series in each branch are under the working voltage; the operating mechanism of the DC constant current power supply is triggered to drive all vacuum interrupters to perform opening or closing actions synchronously; the current change signal generated by the current detection structure during the operation of the vacuum interrupter is collected by the signal acquisition device; the difference of the current change time points of different branches is calculated based on each current change signal, and the synchronicity of the circuit breaker operation and the operation sequence of each branch are determined according to the difference.

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