Opening and closing detection method of contact system, circuit breaker and control system

Abstract

The invention discloses a switch-on and switch-off detection method of a contact system, a circuit breaker and a control system. The switch-on and switch-off detection method comprises the steps that a voltage measuring piece is arranged at a conductive connecting part, connected to an arc contact, of the contact system; acquiring a voltage curve of the conductive connecting part in the opening and closing process of the contact system by adopting a voltage measuring piece; judging whether a first voltage U1 and a second voltage U2 with different voltage values appear or not according to the voltage curve; wherein the voltage value of the first voltage U1 and / or the voltage value of the second voltage U2 are / is larger than 0; if the continuous first voltage U1 and second voltage U2 exist in the voltage curve, the opening and closing function of the contact system is normal; and if the voltage in the voltage curve is zero all the time, the opening and closing function of the contact system is invalid. According to the opening and closing detection method of the contact system, the circuit breaker and the control system, the opening and closing action of the contact system can be detected, and the measurement precision is high.

Description

Technical Field

[0001] This application belongs to the field of electrical equipment technology, and in particular relates to a method for detecting the opening and closing of a contact system, a circuit breaker and a control system. Background Technology

[0002] In current switching applications, the arc contacts of the contact system typically operate in a "close-then-open" manner. During the closing process, the arc contact of the moving contact first contacts the stationary contact. After the main contact of the moving contact is fully in contact with the stationary contact, the arc contact then separates from the stationary contact. During the breaking process, the arc contact of the moving contact first contacts the stationary contact. After the main contact of the moving contact is fully separated from the stationary contact, the arc contact then separates from the stationary contact. The sequence of "close-then-open" actions is reversed in the closing and breaking processes.

[0003] To ensure the effectiveness of the contact system's closing-then-opening action, it is necessary to use detection methods to monitor the sequence and degree of completion of the contact system's actions. However, currently there is no accurate and mature solution for detecting the opening and closing actions of the contact system, making it impossible to guarantee the measurement accuracy of the contact system's opening and closing action sequence. Summary of the Invention

[0004] This application provides a method for detecting the opening and closing of a contact system, a circuit breaker, and a control system, which can detect the opening and closing actions of the contact system and has high measurement accuracy.

[0005] This application provides a method for detecting the opening and closing of a contact system, comprising:

[0006] A voltage measuring element is installed at the conductive connection part of the contact system connected to the arc contact;

[0007] Voltage curves of conductive connections during the opening and closing process of the contact system are obtained using voltage measuring devices;

[0008] Determine whether there is a first voltage U1 and a second voltage U2 with different voltage values ​​based on the voltage curve; wherein the voltage values ​​of the first voltage U1 and / or the second voltage U2 are both greater than 0;

[0009] If the voltage curve shows a continuous first voltage U1 and a second voltage U2, then the contact system's opening and closing function is normal.

[0010] If the voltage in the voltage curve is always 0, the opening and closing function of the contact system will fail.

[0011] The above-described method for detecting the opening and closing of a contact system includes, after determining whether a first voltage U1 and a second voltage U2 with different voltage values ​​appear based on the voltage curve, and determining that the opening and closing function of the contact system is normal, the method further includes: determining the closing-then-opening function of the arc contact of the contact system based on whether mirror-distributed closing and opening waveforms appear on the voltage curve; wherein the closing waveform and / or opening waveform are both formed by the first voltage U1 and the second voltage U2; if the order of appearance of the first voltage U1 and the second voltage U2 in the closing and opening waveforms is mirror-distributed, the arc contact can achieve the closing-then-opening function; if the order of appearance of the first voltage U1 and the second voltage U2 in the closing and opening waveforms is not mirror-distributed, the arc contact cannot achieve the closing-then-opening function.

[0012] The above-described method for detecting the opening and closing of a contact system includes, in the step of determining the function of the arc contact to close before opening, the following steps are also included: determining the order and magnitude of the first voltage U1 and the second voltage U2 in the turn-on waveform; if the first voltage U1 appears in the turn-on waveform before the second voltage U2, and the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2, then the arc contact can achieve the function of closing before the main contacts of the contact system.

[0013] The above-described contact system opening and closing detection method further includes, in the step of determining the function of the arc contact to close first and then open, determining the order of appearance and magnitude of the first voltage U1 and the second voltage U2 in the breaking waveform; if the second voltage U2 appears in the closing waveform before the first voltage U1, and the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2, then the arc contact can realize the function of opening after the main contact of the contact system.

[0014] The above-described method for detecting the opening and closing of a contact system further includes, after determining the function of the arc contact to close first and then open, the following steps: determining whether the voltage of the transition waveform between the closing waveform and the opening waveform is a constant voltage; and determining whether the closing of the contact system is stable based on whether the voltage of the transition waveform is a constant voltage.

[0015] The above-described method for detecting the opening and closing of a contact system further includes: observing the voltage value of the constant voltage of the transition waveform; determining the state of the arc contact during the closing to opening process of the contact system based on the voltage value of the constant voltage of the transition waveform; if the voltage value of the constant voltage is equal to and continuous with the first voltage U1, or if the voltage value of the constant voltage is equal to and continuous with the second voltage U2, then the arc contact remains closed during the closing to opening process of the contact system; if the voltage value of the constant voltage is 0, then the arc contact remains open during the closing to opening process of the contact system.

[0016] The above-mentioned method for detecting the opening and closing of the contact system further includes: observing whether the voltage before the turn-on waveform is constant at 0; and judging the state of the contact system before closing based on the observation results.

[0017] The above-mentioned method for detecting the opening and closing of the contact system further includes: observing whether the voltage after the disconnection waveform is constant at 0; and judging the state of the contact system after disconnection based on the observation results.

[0018] On the other hand, this application also provides a circuit breaker, wherein the opening and closing detection method applicable to the above-mentioned contact system includes a contact system for opening and closing, the contact system includes a stationary contact and a moving contact, the stationary contact includes an arc contact and a main contact, the moving contact includes an arc point and a main contact, the arc contact and the arc point are arranged opposite to each other, the main contact and the main point are arranged opposite to each other, the arc contact and the main contact are detachably connected by a conductive connection part, the conductive connection part protruding from the arc contact and the main contact.

[0019] In another aspect, this application also provides a control system, which includes the circuit breaker mentioned above, and further includes a control unit, a signal output unit, a display unit, a power supply unit, and a detection unit. The signal output unit, display unit, power supply unit, and detection unit are all connected to the control unit. The power supply unit is used to provide power to the control unit. The detection unit includes a voltage measuring element connected to a conductive connection. The control unit is able to read the voltage signal of the detection unit and transmit the voltage signal to the signal output unit and the display unit.

[0020] The contact system opening and closing detection method provided in this application is used to detect the opening and closing actions of the contact system. In this detection method, a voltage measuring device is first installed at the conductive connection of the contact system to the arc contact. The voltage measuring device acquires the voltage curve of the conductive connection during the opening and closing process of the contact system. The voltage measuring device can measure the voltage drop at the conductive connection of the arc contact. When the arc contact is in the closed state, the voltage measuring device can measure the voltage. When the arc contact and the main contact close or open sequentially, the voltage measuring device can form a complete voltage curve. At this time, the voltage curve is used to determine... The method detects whether different voltage values, first voltage U1 and second voltage U2, appear in the voltage curve. If the voltage curve shows continuous first voltage U1 and second voltage U2, it indicates that the voltage at the conductive connection has corresponding changes when the arc contact closes or opens, and when the main contact closes or opens, indicating that the contact system's opening and closing function is normal. If the voltage in the voltage curve is always 0, it indicates that only the main contact closes or opens in the contact system, and there is no voltage drop at the conductive connection. Therefore, the voltage measuring device cannot measure the voltage, indicating that the arc contact cannot close, and the contact system's opening and closing function is faulty. The contact system opening and closing detection method in this application can accurately detect the voltage changes caused by the opening and closing actions of the contact system, and can determine whether the contact system's opening and closing function is faulty based on the detection results, exhibiting high measurement accuracy. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a flowchart of the contact system opening and closing detection method according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the contact system of the circuit breaker according to an embodiment of this application;

[0024] Figure 3 This is an overall schematic diagram of the control system according to an embodiment of this application;

[0025] Figure 4 This is a circuit diagram of the contact system of the circuit breaker according to an embodiment of this application;

[0026] Figure 5 This is a schematic diagram showing the arc contact connection of the contact system of the circuit breaker according to an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the contact system of the circuit breaker in an embodiment of this application being fully closed;

[0028] Figure 7 This is a voltage curve diagram of a contact system of a circuit breaker according to an embodiment of this application when it is closed;

[0029] Figure 8 This is a voltage curve diagram of another contact system of the circuit breaker according to an embodiment of this application when it is closed.

[0030] Explanation of icon numbers:

[0031] 10. Stationary contact; 20. Moving contact; 21. Arc contact; 22. Main contact; 30. Arc contact; 31. Conductive connection part; 311. First connection point; 312. Second connection point; 40. Main contact; 50. Voltage measuring element;

[0032] 100. Contact system; 200. Control unit; 300. Signal output unit; 400. Display unit; 500. Power supply unit; 600. Detection unit. Detailed Implementation

[0033] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0034] like Figure 2 As shown in the embodiment of this application, the contact system opening and closing detection method can detect the opening and closing function of the contact system 100 of the circuit breaker. The contact system 100 of the circuit breaker includes a stationary contact 10 and a moving contact 20. The stationary contact 10 includes an arc contact 30 and a main contact 40. The moving contact 20 includes an arc contact 21 and a main contact 22. The arc contact 30 and the arc contact 21 are positioned opposite each other, and the main contact 40 and the main contact 22 are positioned opposite each other. The arc contact 30 and the main contact 40 are detachably connected by a conductive connection part 31, which protrudes from the arc contact 30 and the main contact 40.

[0035] like Figure 5 and Figure 6As shown, when the contact system 100 closes, the moving contact 20 rotates toward the stationary contact 10, and the arc contact 21 of the moving contact 20 first contacts the arc contact 30 of the stationary contact 10. After the arc contact 21 contacts the arc contact 30 and compresses a certain distance, the main contact 22 of the moving contact 20 contacts the main contact 40 of the stationary contact 10, thus completing the initial closing process of the arc contact 30. When the contact system 100 closes, the moving contact 20 rotates away from the stationary contact 10. Since there is a certain overtravel between the arc contact 30 and the arc contact 21 during the closing process, the main contact 22 of the moving contact 20 first separates from the main contact 40 of the stationary contact 10. After separating a certain distance, the arc contact 30 separates from the arc contact 21 again, thus completing the subsequent opening process of the arc contact 30.

[0036] During the frequent opening and closing of the contact system 100, the arc contact 30 and the arc contact 21, due to their characteristic of closing before opening, generate most of the electric arc between them. This arcing causes wear on the arc contact 30. Severe wear increases the closing stroke, and the contact time between the arc contact 30 and the arc contact 21 may be equal to or later than the contact time between the main contact 22 and the main contact 40, ultimately causing the contact system 100 to fail to open and close. Therefore, this application proposes a method for detecting the opening and closing of a contact system, which can accurately detect the opening and closing function of the contact system 100.

[0037] like Figures 1 to 8 As shown in the figure, this application provides a method for detecting the opening and closing of a contact system, which includes:

[0038] S100. A voltage measuring element 50 is provided at the conductive connection portion 31 of the contact system 100 connected to the arc contact 30. The voltage measuring element 50 is capable of measuring the voltage drop at the conductive connection portion 31 of the arc contact 30.

[0039] S200: The voltage measuring device 50 is used to obtain the voltage curve of the conductive connection 31 during the opening and closing process of the contact system 100. When the arc contact 30 is in the closed state, a voltage drop is generated between the arc contact 30 and the main contact 40. Since the arc contact 30 and the main contact 40 are connected through the conductive connection 31, the voltage measuring device 50 can measure the voltage by detecting the conductive connection 31. When the arc contact 30 and the main contact 40 are closed or opened in sequence, the voltage measuring device 50 can form a complete voltage curve.

[0040] S300. Determine whether a first voltage U1 and a second voltage U2 with different voltage values ​​appear based on the voltage curve; wherein, if the voltage values ​​of the first voltage U1 and / or the second voltage U2 are both greater than 0, it indicates that the voltage at the conductive connection 31 changes when the voltage measuring device 50 measures the appearance of the first voltage U1 and / or the second voltage U2.

[0041] S310. If the voltage curve has a continuous first voltage U1 and a second voltage U2, then the opening and closing function of the contact system 100 is normal.

[0042] S320. If the voltage in the voltage curve is always 0, the opening and closing function of the contact system 100 will fail.

[0043] In specific implementation, during the voltage measurement of the conductive connection 31 using the voltage measuring device 50, if the voltage curve shows a continuous first voltage U1 and a second voltage U2, it indicates that when the arc contact 30 closes or opens, and when the main contact 40 closes or opens, the voltage at the conductive connection 31 shows a corresponding voltage change. Therefore, the closing and opening function of the contact system 100 is normal. If the voltage in the voltage curve is always 0, it indicates that only the main contact 40 closes or opens in the contact system 100, and there is no voltage drop at the conductive connection 31. The voltage measuring device 50 cannot measure the voltage, thus it can be determined that the arc contact 30 cannot close, and the closing and opening function of the contact system 100 is faulty. The closing and opening detection method of the contact system in this application can accurately detect the voltage changes caused by the closing and opening actions of the contact system 100, and can determine whether the closing and opening function of the contact system 100 is faulty based on the detection results, exhibiting high measurement accuracy.

[0044] Because the conductive connection portion 31 protrudes from the arc contact 30 and the main contact 40, it is more convenient for the voltage measuring element 50 to measure the conductive connection portion 31, thus improving the ease of testing; moreover, Figure 4 As shown, if the two ends of the main contact 40 are measured directly, the voltage change across the main circuit will be too large when the main contact 40 opens and closes, ranging from millivolts to kilovolts, making it impossible to guarantee measurement accuracy; Figure 5 As shown, in this embodiment, the voltage measuring device 50 directly measures the conductive connection part 31. The resistance of the conductive connection part 31 is relatively large, while the resistances of the arc contact 30 and the main contact 40 are relatively small. Therefore, the voltage across the conductive connection part 31 will not change significantly when the arc contact 30 and the main contact 40 are closed. The voltage curve can accurately determine whether there is a first voltage U1 and a second voltage U2 with different voltage values, thus achieving high measurement accuracy.

[0045] Specifically, such as Figure 2As shown, the conductive connection part 31 includes a first connection point 311 and a second connection point 312. The conductive connection part 31 is detachably connected to the arc contact 30 through the first connection point 311, and the conductive connection part 31 is detachably connected to the main contact 40 through the second connection point 312. When the voltage of the conductive connection part 31 is measured using the voltage measuring device 50, the two measuring terminals of the voltage measuring device 50 can measure the first connection point 311 and the second connection point 312 respectively, improving the convenience and accuracy of voltage measurement.

[0046] The contact system opening and closing detection method of this application embodiment, after determining whether a first voltage U1 and a second voltage U2 with different voltage values ​​appear based on the voltage curve, and determining that the opening and closing function of the contact system 100 is normal, further includes:

[0047] The function of the arc contact 30 of the contact system 100 to close first and then open is determined by whether the voltage curve shows a mirror distribution of the closing and opening waveforms. The closing waveform and / or the opening waveform are both formed by the first voltage U1 and the second voltage U2. If the order of appearance of the first voltage U1 and the second voltage U2 in the closing and opening waveforms is mirrored, the arc contact 30 can realize the function of closing first and then opening. If the order of appearance of the first voltage U1 and the second voltage U2 in the closing and opening waveforms is not mirrored, the arc contact 30 cannot realize the function of closing first and then opening.

[0048] In specific implementation, the connection waveform is the voltage waveform generated by the contact between the arc contact 30 and the arc contact 21 and the contact between the main contact 22 and the main contact 40, and the disconnection waveform is the voltage waveform generated by the separation between the arc contact 30 and the arc contact 21 and the separation between the main contact 22 and the main contact 40. If the order of the first voltage U1 and the second voltage U2 in the closing and opening waveforms is mirrored by voltage curve analysis, it indicates that during the closing process, the arc contact 30 and the arc contact 21 make contact before the main contact 22 and the main contact 40, and during the opening process, the arc contact 30 and the arc contact 21 separate after the main contact 22 and the main contact 40. The time interval between the contact and separation of the main contact 22 and the main contact 40 is relatively small, while the time interval between the contact and separation of the arc contact 30 and the arc contact 21 is relatively large. Therefore, it can be determined that the arc contact 30 can achieve the function of closing before opening, and the opening and closing function of the contact system 100 is normal. Conversely, if the order of the first voltage U1 and the second voltage U2 in the closing and opening waveforms is not mirrored, the arc contact 30 cannot achieve the function of closing before opening, and the opening and closing function of the contact system 100 is abnormal, requiring repair of the arc contact 30 of the contact system 100.

[0049] Specifically, such as Figure 7In the voltage curve shown, the waveform from t0 to t2 is the on-time waveform, and the waveform from t0' to t2' is the off-time waveform. The durations of the two are different, but the order of appearance of the first voltage U1 and the second voltage U2 is mirrored.

[0050] The contact system opening and closing detection method of this application embodiment further includes, in the step of determining the function of the arc contact 30 to close first and then open, determining the order of appearance and magnitude of the first voltage U1 and the second voltage U2 in the turn-on waveform; if the first voltage U1 appears in the turn-on waveform before the second voltage U2, and the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2, then the arc contact 30 can realize the function of closing before the main contact 40 of the contact system 100.

[0051] In specific implementation, in the turn-on waveform, the first voltage U1 appears before the second voltage U2, and the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2. This indicates that when the arc contact 30 and the arc contact 21 first make contact, the voltage value at the conductive connection 31 is the larger first voltage U1. When the main contact 22 and the main contact 40 subsequently make contact, according to the parallel circuit voltage distribution rule, the main circuit where the main contact 40 is located is turned on, and the voltage value at the conductive connection 31 abruptly changes to the smaller second voltage U2. Therefore, based on this step, it can be determined that the arc contact 30 can achieve the function of closing the main contact 40 of the contact system 100 before the main contact 40 closes.

[0052] The contact system opening and closing detection method of this application embodiment further includes, in the step of determining the function of the arc contact 30 to close first and then open, determining the order of appearance and magnitude of the first voltage U1 and the second voltage U2 in the breaking waveform; if the second voltage U2 appears in the closing waveform before the first voltage U1, and the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2, then the arc contact 30 can realize the function of opening after the main contact 40 of the contact system 100.

[0053] In specific implementation, in the breaking waveform, the second voltage U2 appears before the first voltage U1 in the closing waveform, and the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2. This indicates that when the main contact 22 and the main contact 40 separate, the voltage value at the conductive connection 31 changes abruptly from the smaller second voltage U2 to the larger first voltage U1. At this time, the arc contact 30 and the arc contact 21 still maintain contact. Therefore, based on this step, it can be determined that the arc contact 30 can achieve the function of opening the main contact 40 later than the contact system 100.

[0054] The contact system opening and closing detection method of this application embodiment further includes, after the step of determining the first-close-then-open function of the arc contact 30, determining whether the voltage of the transition waveform between the closing waveform and the opening waveform is a constant voltage; and determining whether the closing of the contact system 100 is stable based on whether the voltage of the transition waveform is a constant voltage.

[0055] In practice, after the contact system 100 is fully closed, the arc contact 30 and the arc contact 21 maintain stable contact, and the main contact 22 and the main contact 40 maintain stable contact. At this time, the voltage through the conductive connection 31 remains constant. If the voltage becomes unstable, it indicates that there is a loose connection between the arc contact 30 and the arc contact 21. Therefore, by detecting whether the transition waveform is a constant value, it is possible to determine whether the closing of the contact system 100 is stable.

[0056] The contact system opening and closing detection method of this application embodiment further includes: observing the voltage value of the constant voltage of the transition waveform; determining the state of the arc contact 30 during the closing to opening process of the contact system 100 based on the voltage value of the constant voltage of the transition waveform; if the voltage value of the constant voltage is equal to and continuous with the first voltage U1, or if the voltage value of the constant voltage is equal to and continuous with the second voltage U2, then the arc contact 30 remains closed during the closing to opening process of the contact system 100; if the voltage value of the constant voltage is 0, then the arc contact 30 remains open during the closing to opening process of the contact system 100.

[0057] In practical implementation, when observing the constant voltage value of the transition waveform, such as... Figure 7 As shown, if the constant voltage value is equal to and continuous with the first voltage U1, or if the constant voltage value is equal to and continuous with the second voltage U2, it indicates that the transition voltage value always remains greater than 0 and continuous. That is, there is always voltage at the conductive connection 31. During the closing and opening process of the contact system 100, the arc contact 30 is always in contact with the arc contact 21, i.e., it remains in a closed state. Figure 8 As shown, if the constant voltage value is equal to 0, it means that there is no voltage at the conductive connection 31 during the closing to opening process, and the arc contact 30 is always separated from the arc contact 21, that is, it remains in the open state.

[0058] It should be noted that during the transition from closing to opening of the contact system 100, the circuit breaker's contact system 100 can function normally regardless of whether the arc contact 30 is in the open or closed state. This does not affect the closing and opening process of the contact system 100; they are simply two different design approaches. Using this method, the design approach of the circuit breaker's arc contact 30 can be determined, specifically whether the arc contact 30 is in the open state after the main contact 40 is closed. This method is convenient, as the specific design approach can be determined simply by observing the voltage curve, without needing to open the circuit breaker to observe its internal structure and the specific operation of the contact system 100.

[0059] Specifically, since the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2, and the second voltage U2 is the voltage value after the main contact 40 is turned on and before it is turned off, it is only necessary to observe whether the voltage value of the constant voltage is equal to the second voltage U2 and whether it is continuous with the second voltage U2 in the voltage curve.

[0060] The contact system opening and closing detection method of this application embodiment further includes: observing whether the voltage before the turn-on waveform is constant at 0; and judging the state of the contact system 100 before closing based on the observation results.

[0061] In practice, observe whether the voltage before the connection waveform is constant at 0. If the voltage before the connection waveform is constant at 0, it can be determined that the arc contact 30 and arc contact 21 of the contact system 100 are not in contact, the main contact 40 and main contact 22 are not in contact, and the contact system 100 as a whole is not experiencing any loose connection or short circuit. The contact system 100 can perform the closing operation normally. If the voltage before the connection waveform is greater than 0, it indicates that the contact system 100 is already in the closing state, or there is a loose connection or short circuit, and the contact system 100 needs to be repaired.

[0062] The contact system opening and closing detection method of this application embodiment further includes: observing whether the voltage after the disconnection waveform is constant at 0; and judging the state of the contact system after 100 disconnection based on the observation results.

[0063] In practice, observe whether the voltage after the breaking waveform is constant at 0. If the voltage after the breaking waveform is constant at 0, it means that the contact system 100 has broken completely and there is no loose connection or short circuit in the contact system 100 as a whole. If the voltage after the breaking waveform is greater than 0, it means that the contact system 100 has not broken completely, or there is a loose connection or short circuit after breaking, and the contact system 100 needs to be repaired.

[0064] like Figure 3As shown in the figure, this application embodiment also provides a control system, which includes the circuit breaker mentioned above, and also includes a control unit 200, a signal output unit 300, a display unit 400, a power supply unit 500, and a detection unit 600. The signal output unit 300, the display unit 400, the power supply unit 500, and the detection unit 600 are all connected to the control unit 200. The power supply unit 500 is used to provide power to the control unit 200. The detection unit 600 includes a voltage measuring element 50 connected to the conductive connection portion 31. The control unit 200 can read the voltage signal of the detection unit 600 and transmit the voltage signal to the signal output unit 300 and the display unit 400.

[0065] In specific implementation, the control unit 200 is an MCU (Microcontroller Unit). Under the power supply of the power supply unit 500, the control unit 200 can process the voltage signal detected by the detection unit 600 and output the processing results to the signal output unit 300 and the display unit 400 respectively. The signal output unit 300 can output instructions for the operation of the circuit breaker according to the change of the voltage signal, and the display unit 400 can provide the voltage curve to the inspection personnel. If the inspection personnel observe an abnormality in the voltage curve, they can inspect the contact system 100 of the circuit breaker.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0067] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for detecting the opening and closing of a contact system, characterized in that, include: A voltage measuring element (50) is provided at the conductive connection portion (31) of the contact system (100) connected to the arc contact (30); The voltage measuring device (50) is used to obtain the voltage curve of the conductive connection (31) during the opening and closing process of the contact system (100); Based on the voltage curve, determine whether a first voltage U1 and a second voltage U2 with different voltage values ​​appear; wherein the voltage values ​​of the first voltage U1 and / or the second voltage U2 are both greater than 0; If the voltage curve contains a continuous first voltage U1 and second voltage U2, then the opening and closing function of the contact system (100) is normal. If the voltage in the voltage curve is always 0, then the opening and closing function of the contact system (100) fails.

2. The method for detecting the opening and closing of a contact system according to claim 1, characterized in that, After determining whether a first voltage U1 and a second voltage U2 with different voltage values ​​appear based on the voltage curve, and determining that the opening and closing function of the contact system (100) is normal, the method further includes: The function of the arc contact (30) of the contact system (100) to make and break first is determined based on whether the voltage curve shows a mirror-distributed turn-on waveform and a break-off waveform; wherein the turn-on waveform and / or the break-off waveform are both formed by the first voltage U1 and the second voltage U2; If the order of appearance of the first voltage U1 and the second voltage U2 in the connection waveform and the disconnection waveform is mirrored, the arc contact (30) can realize the function of first closing and then opening; If the order of appearance of the first voltage U1 and the second voltage U2 in the connection waveform and the disconnection waveform is not mirrored, the arc contact (30) cannot achieve the function of first closing and then opening.

3. The method for detecting the opening and closing of a contact system according to claim 2, characterized in that, The step of determining the first-close-then-open function of the arc contact (30) also includes: Determine the order of occurrence and magnitude of the first voltage U1 and the second voltage U2 in the turn-on waveform; If the first voltage U1 is displayed in the turn-on waveform before the second voltage U2, and the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2, then the arc contact (30) can achieve the function of closing before the main contact (40) of the contact system (100).

4. The method for detecting the opening and closing of a contact system according to claim 2, characterized in that, The step of determining the first-close-then-open function of the arc contact (30) also includes: Determine the order of occurrence and magnitude of the first voltage U1 and the second voltage U2 in the broken waveform; If the second voltage U2 is displayed in the turn-on waveform before the first voltage U1, and the voltage value of the first voltage U1 is greater than the voltage value of the second voltage U2, then the arc contact (30) can realize the function of opening the main contact (40) after the contact system (100).

5. The method for detecting the opening and closing of a contact system according to claim 2, characterized in that, After determining the first-close-then-open function of the arc contact (30), the process further includes: Determine whether the voltage of the transition waveform between the turn-on waveform and the turn-off waveform is a constant voltage; Whether the closing of the contact system (100) is stable is determined based on whether the voltage of the transition waveform is a constant voltage.

6. The method for detecting the opening and closing of a contact system according to claim 5, characterized in that, Further includes: Observe the constant voltage value of the transition waveform; The state of the arc contact (30) during the closing to opening process of the contact system (100) is determined based on the voltage value of the constant voltage of the transition waveform; If the voltage value of the constant voltage is equal to the first voltage U1 and is continuous with the first voltage U1, or if the voltage value of the constant voltage is equal to the second voltage U2 and is continuous with the second voltage U2, then the arc contact (30) remains closed throughout the closing to opening process of the contact system (100). If the voltage value of the constant voltage is equal to 0, the arc contact (30) remains open throughout the closing and opening process of the contact system (100).

7. The method for detecting the opening and closing of a contact system according to claim 2, characterized in that, Further includes: Observe whether the voltage before the waveform is turned on is constant at 0; The state of the contact system (100) before closing is determined based on the observation results.

8. The method for detecting the opening and closing of a contact system according to claim 2, characterized in that, Further includes: Observe whether the voltage after the broken waveform is constant at 0; The state of the contact system (100) after opening is determined based on the observation results.

9. A circuit breaker, characterized in that, A method for detecting the opening and closing of a contact system as described in any one of claims 1 to 8, wherein the circuit breaker includes a contact system (100) for opening and closing, the contact system (100) includes a stationary contact (10) and a moving contact (20), the stationary contact (10) includes an arc contact (30) and a main contact (40), the moving contact (20) includes an arc contact (21) and a main contact (22), the arc contact (30) and the arc contact (21) are positioned opposite each other, the main contact (40) and the main contact (22) are positioned opposite each other, the arc contact (30) and the main contact (40) are detachably connected by a conductive connection part (31), the conductive connection part (31) protruding from the arc contact (30) and the main contact (40).

10. A control system, characterized in that, The circuit breaker as described in claim 9 further includes a control unit (200), a signal output unit (300), a display unit (400), a power supply unit (500), and a detection unit (600). The signal output unit (300), the display unit (400), the power supply unit (500), and the detection unit (600) are all connected to the control unit (200). The power supply unit (500) is used to provide power to the control unit (200). The detection unit (600) includes a voltage measuring element (50) connected to the conductive connection portion (31). The control unit (200) is able to read the voltage signal of the detection unit (600) and transmit the voltage signal to the signal output unit (300) and the display unit (400).

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