Circuit breaker opening and closing circuit monitoring system and method

Abstract

The present invention discloses a circuit breaker opening and closing circuit monitoring system and method, which relates to the field of electric power operation and maintenance technology, and its main purpose is to solve the problem of low monitoring accuracy of circuit breaker opening and closing circuits. It mainly includes circuit breaker auxiliary contacts and circuit breaker opening and closing circuit monitors. The circuit breaker opening and closing circuit monitors include a switch input circuit, a first voltage monitoring circuit, a second voltage monitoring circuit, a central control module and an alarm circuit. It collects the auxiliary contact status and determines the circuit breaker opening and closing status according to the auxiliary contact status, and collects the first voltage value at both ends of the circuit breaker normally closed contact and the second voltage value at both ends of the circuit breaker normally open contact. The corresponding circuit is monitored according to the circuit breaker opening and closing status and the comparison result of the first voltage value or the second voltage value with the preset voltage threshold. It is used to monitor the integrity of the closing circuit in the closed state of the circuit breaker and the integrity of the opening circuit in the open state, and to issue an alarm when the circuit is disconnected.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power operation and maintenance, and in particular to a circuit breaker opening and closing circuit monitoring system and method. Background Art

[0002] Circuit breakers are essential protection and control devices in power systems, ensuring safe and stable operation and protecting equipment and personnel. The circuit breaker's opening and closing circuit, responsible for controlling the circuit breaker's closing and opening operations, is a crucial component of the power system. By monitoring the circuit breaker's opening and closing status, the breaker's opening and closing status can be monitored in real time, ensuring proper operation when needed. In the event of a malfunction or failure, a timely warning can be issued to mitigate potential safety hazards and prevent accidents from escalating.

[0003] Currently, existing methods for monitoring the opening and closing circuits of circuit breakers primarily utilize a series connection of normally closed contacts between a trip position relay and a closed position relay. However, this method can only monitor the integrity of the opening circuit in the closed state and the closing circuit when the circuit breaker is in the open state. It cannot monitor the integrity of the opening and closing circuits in other states, making it impossible to comprehensively monitor the integrity of the circuit breaker's opening and closing circuits in all states. This results in low monitoring accuracy for the circuit breaker's opening and closing circuits. Summary of the Invention

[0004] In view of this, the present invention provides a circuit breaker opening and closing circuit monitoring system, the main purpose of which is to solve the problem of low monitoring accuracy of the existing circuit breaker opening and closing circuit.

[0005] According to one aspect of the present invention, a circuit breaker opening and closing circuit monitoring system is provided, comprising: a circuit breaker auxiliary contact and a circuit breaker opening and closing circuit monitor, wherein the circuit breaker opening and closing circuit monitor comprises a switching input circuit, a first voltage monitoring circuit, a second voltage monitoring circuit, a central control module, and an alarm circuit;

[0006] The switch input circuit is connected to the auxiliary contact of the circuit breaker and is used to collect the state of the auxiliary contact, wherein the state of the auxiliary contact switches synchronously with the opening and closing state of the circuit breaker;

[0007] The two input contacts of the first voltage monitoring circuit are respectively connected to the two ends of the normally closed contact of the circuit breaker in the circuit breaker closing circuit, and are used to collect the first voltage value at the two ends of the normally closed contact of the circuit breaker;

[0008] The two input contacts of the second voltage monitoring circuit are respectively connected to the two ends of the normally open contact of the circuit breaker in the circuit breaker tripping circuit, and are used to collect the second voltage value at the two ends of the normally open contact of the circuit breaker;

[0009] The central control module is configured to obtain a preset voltage threshold and the auxiliary contact state, and output a closing circuit alarm signal in the closing state through an alarm circuit when the circuit breaker is determined to be in the closed state based on the auxiliary contact state and the first voltage value is less than the preset voltage threshold; and output an opening circuit alarm signal in the opening state through the alarm circuit when the circuit breaker is determined to be in the open state based on the auxiliary contact state and the second voltage value is less than the preset voltage threshold;

[0010] The alarm circuit is used to output an alarm signal under the control of the central control module;

[0011] Wherein, the first voltage monitoring circuit and the second voltage monitoring circuit both include a high-impedance resistor voltage divider circuit so as not to affect the operation of the opening and closing circuit during the voltage acquisition process.

[0012] Furthermore, in the case where the circuit breaker opening and closing circuit is connected to the circuit breaker mechanism anti-tripping circuit, the circuit breaker closing circuit includes a newly added circuit breaker normally closed contact and an anti-tripping relay normally closed contact connected in series to inhibit the opening position relay and the anti-tripping relay from actuating each other, and the system includes a voltage dividing resistor;

[0013] The voltage-dividing resistor is used to replace the normally closed contacts of the circuit breaker and the normally closed contacts of the anti-trip relay connected in series in the circuit breaker closing circuit before the first voltage monitoring circuit collects the first voltage value, so that the voltage division of the opening position relay and the anti-trip relay is adjusted to be less than their respective starting voltages, and the first voltage monitoring circuit can be turned on, wherein the newly added normally closed contacts of the circuit breaker in the circuit breaker closing circuit are connected in series with the normally closed contacts of the anti-trip relay to inhibit the opening position relay and the anti-trip relay from starting each other.

[0014] Furthermore, the switching value input circuit includes a first switching value input circuit and a second switching value input circuit;

[0015] The first switching input circuit is used to collect the status of the normally closed auxiliary contact of the circuit breaker;

[0016] The second switching input circuit is used to collect the status of the normally open auxiliary contact of the circuit breaker;

[0017] The central control module is further configured to determine that the circuit breaker is in a closed state when the normally closed auxiliary contact of the circuit breaker is disconnected; and to determine that the circuit breaker is in an open state when the normally open auxiliary contact of the circuit breaker is disconnected.

[0018] Furthermore, the system further comprises a control loop disconnection circuit, and the alarm circuit comprises a first alarm circuit and a second alarm circuit;

[0019] The control circuit disconnection circuit includes a normally closed contact of a closing position relay and a normally closed contact of an opening position relay connected in series. When the normally closed contact of the closing position relay and the normally closed contact of the opening position relay are both closed, the control circuit disconnection circuit outputs an opening circuit alarm signal in a closing state or a closing circuit alarm signal in an opening state according to the opening and closing states of the circuit breaker;

[0020] The first alarm circuit is used to output a closing circuit alarm signal, and the second alarm circuit is used to output an opening circuit alarm signal, wherein the output contacts of the first alarm circuit and the second alarm circuit are connected to the output end of the control circuit disconnection circuit to output the alarm signal in parallel with the control circuit disconnection circuit;

[0021] The central control module is further configured to suppress the output of the first alarm circuit when the normally closed auxiliary contact of the circuit breaker is closed, so as to output a closing circuit alarm signal in the opening state through the control circuit disconnection circuit; and to suppress the output of the second alarm circuit when the normally open auxiliary contact of the circuit breaker is closed, so as to output an opening circuit alarm signal in the closing state through the control circuit disconnection circuit.

[0022] Furthermore, the first voltage monitoring circuit includes a first sampling circuit, a first amplifying circuit and a first analog-to-digital conversion circuit, and the second voltage detection circuit includes a second sampling circuit, a second amplifying circuit and a second analog-to-digital conversion circuit;

[0023] The first sampling circuit is used to collect a first voltage analog signal at both ends of the normally closed contacts of the circuit breaker in the circuit breaker closing circuit;

[0024] The first amplifier circuit is used to amplify the first voltage analog signal to obtain an amplified first voltage analog signal;

[0025] The first analog-to-digital conversion circuit is configured to convert the amplified first voltage analog signal into a digital signal to obtain a first voltage value;

[0026] The second sampling circuit is used to collect a second voltage analog signal at both ends of the normally open contacts of the circuit breaker in the circuit breaker tripping circuit;

[0027] The second amplifier circuit is configured to amplify the second voltage analog signal to obtain an amplified second voltage analog signal;

[0028] The second analog-to-digital conversion circuit is used to convert the amplified second voltage analog signal into a digital signal to obtain a second voltage value.

[0029] According to another aspect of the present invention, a method for monitoring a circuit breaker opening and closing circuit is provided, comprising:

[0030] Obtaining a preset voltage threshold and an auxiliary contact state collected by a switch input circuit, wherein the switch input circuit is connected to the auxiliary contact of the circuit breaker, and the auxiliary contact state switches synchronously with the opening and closing state of the circuit breaker;

[0031] collecting a first voltage value at both ends of a normally closed contact of a circuit breaker in the circuit breaker closing circuit through two input contacts of a first voltage monitoring circuit, wherein the two input contacts of the first voltage monitoring circuit are respectively connected to both ends of the normally closed contact of the circuit breaker in the circuit breaker closing circuit;

[0032] collecting a second voltage value at both ends of a normally open contact of a circuit breaker in the circuit breaker tripping circuit through two input contacts of a second voltage monitoring circuit, wherein the two input contacts of the second voltage monitoring circuit are respectively connected to both ends of the normally open contact of the circuit breaker in the circuit breaker tripping circuit;

[0033] When it is determined that the circuit breaker is in the closed state according to the auxiliary contact state and the first voltage value is less than the preset voltage threshold, the alarm circuit is controlled to output a closing circuit alarm signal in the closed state;

[0034] When it is determined that the circuit breaker is in the open state according to the auxiliary contact state, and the second voltage value is less than the preset voltage threshold, controlling the alarm circuit to output an open circuit alarm signal in the open state;

[0035] Wherein, the first voltage monitoring circuit and the second voltage monitoring circuit both include a high-impedance resistor voltage divider circuit so as not to affect the operation of the opening and closing circuit during the voltage acquisition process.

[0036] Furthermore, in the case where the circuit breaker opening and closing circuit is connected to the circuit breaker mechanism anti-tripping circuit, the circuit breaker closing circuit includes a newly added circuit breaker normally closed contact and an anti-tripping relay normally closed contact connected in series to inhibit the opening position relay and the anti-tripping relay from activating each other;

[0037] Before collecting the first voltage value at both ends of the normally closed contacts of the circuit breaker in the circuit breaker closing circuit through the two input contacts of the first voltage monitoring circuit, the method further includes:

[0038] The newly added circuit breaker normally closed contacts and the anti-trip relay normally closed contacts connected in series in the circuit breaker closing circuit are replaced with voltage dividing resistors so that the divided voltages of the regulating opening position relay and the anti-trip relay are respectively less than their respective starting voltages, and the first voltage monitoring circuit can be turned on.

[0039] Furthermore, the switching input circuit includes a first switching input circuit and a second switching input circuit, and the auxiliary contact state includes a circuit breaker normally closed auxiliary contact state and a circuit breaker normally closed auxiliary contact state; determining the circuit breaker opening and closing state according to the auxiliary contact state includes:

[0040] collecting the state of the normally closed auxiliary contact of the circuit breaker through the first switching value input circuit, and determining that the circuit breaker is in the closed state when the normally closed auxiliary contact of the circuit breaker is in the open state;

[0041] The state of the normally open auxiliary contact of the circuit breaker is collected through the second switching input circuit. When the state of the normally open auxiliary contact of the circuit breaker is disconnected, it is determined that the circuit breaker is in the open state.

[0042] Furthermore, the alarm circuit includes a first alarm circuit and a second alarm circuit, wherein the output contacts of the first alarm circuit and the second alarm circuit are connected to the output end of the control loop disconnection circuit to output an alarm signal in parallel with the control loop disconnection circuit, and the control loop disconnection circuit includes a normally closed contact of a closing position relay and a normally closed contact of an opening position relay connected in series. When the normally closed contact of the closing position relay and the normally closed contact of the opening position relay are both closed, the control loop disconnection circuit outputs an opening circuit alarm signal in a closing state or a closing circuit alarm signal in an opening state according to the state of the circuit breaker;

[0043] When the normally closed auxiliary contact of the circuit breaker is in a closed state, the output of the first alarm circuit is suppressed to output a closing circuit alarm signal in an open state through the control circuit disconnection circuit;

[0044] When the normally open auxiliary contact of the circuit breaker is in a closed state, the output of the second alarm circuit is suppressed, so as to output an opening circuit alarm signal in a closed state through the control circuit disconnection circuit.

[0045] Furthermore, the first voltage monitoring circuit includes a first sampling circuit, a first amplifying circuit and a first analog-to-digital conversion circuit, and the second voltage detection circuit includes a second sampling circuit, a second amplifying circuit and a second analog-to-digital conversion circuit;

[0046] The collecting of the first voltage values at both ends of the normally closed contacts of the circuit breaker in the circuit breaker closing circuit through the two input contacts of the first voltage monitoring circuit includes:

[0047] collecting, by the first sampling circuit, a first voltage analog signal at both ends of a normally closed contact of a circuit breaker in a circuit breaker closing circuit, amplifying the first voltage analog signal by the first amplifying circuit to obtain an amplified first voltage analog signal, and converting the amplified first voltage analog signal by the first analog-to-digital conversion circuit into a digital signal to obtain a first voltage value;

[0048] The collecting of the second voltage value at both ends of the normally open contacts of the circuit breaker in the circuit breaker tripping circuit through the two input contacts of the second voltage monitoring circuit includes:

[0049] The second sampling circuit collects a second voltage analog signal at both ends of the normally open contacts of the circuit breaker in the circuit breaker tripping circuit, the second voltage analog signal is amplified by the second amplifying circuit to obtain an amplified second voltage analog signal, and the second analog-to-digital conversion circuit converts the amplified second voltage analog signal into a digital signal to obtain a second voltage value.

[0050] By means of the above technical solution, the technical solution provided by the embodiment of the present invention has at least the following advantages:

[0051] The present invention provides a circuit breaker opening and closing circuit monitoring system and method. In an embodiment of the present invention, a switch input circuit is connected to the auxiliary contact of the circuit breaker, and the auxiliary contact state is collected through the switch input circuit; two input contacts of a first voltage monitoring circuit are respectively connected to the two ends of the normally closed contact of the circuit breaker in the circuit breaker closing circuit, and the first voltage value at the two ends of the normally closed contact of the circuit breaker is collected through the first voltage monitoring circuit; two input contacts of a second voltage monitoring circuit are respectively connected to the two ends of the normally open contact of the circuit breaker in the circuit breaker opening circuit, and the second voltage value at the two ends of the normally open contact of the circuit breaker is collected through the second voltage monitoring circuit; a preset voltage threshold and the auxiliary contact state are obtained through a central control module, and the auxiliary contact state is obtained according to the auxiliary contact state. When the contact status determines that the circuit breaker is in the closed state and the first voltage value is less than the preset voltage threshold, the alarm circuit outputs a closing circuit alarm signal in the closed state; when the circuit breaker is determined to be in the open state based on the auxiliary contact status and the second voltage value is less than the preset voltage threshold, the alarm circuit outputs an opening circuit alarm signal in the open state; under the control of the central control module, the alarm circuit outputs the alarm signal, thereby realizing the monitoring of the closing circuit in the closed state of the circuit breaker and the opening circuit in the open state of the circuit breaker, greatly increasing the comprehensiveness of the monitoring of the closing and opening circuits of the circuit breaker, filling the gaps in the existing monitoring means, and thus improving the accuracy of the monitoring of the closing and opening circuits of the circuit breaker.

[0052] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0054] Figure 1 The following is a block diagram showing the composition of a circuit breaker opening and closing circuit monitoring system provided by an embodiment of the present invention;

[0055] Figure 2 A schematic diagram showing the connection relationship of a switching circuit provided by an embodiment of the present invention is shown;

[0056] Figure 3 A schematic diagram of a closing circuit connection connected to a circuit breaker opening and closing circuit monitor provided by an embodiment of the present invention is shown;

[0057] Figure 4 A schematic diagram of a connection of an opening circuit connected to a circuit breaker opening and closing circuit monitor provided by an embodiment of the present invention is shown;

[0058] Figure 5 A closing circuit connected to an anti-tripping circuit of a circuit breaker mechanism provided by an embodiment of the present invention is shown;

[0059] Figure 6 The embodiment of the present invention shows a closing circuit based on a modified voltage-dividing resistor connected to an anti-tripping circuit of a circuit breaker mechanism;

[0060] Figure 7 The present invention provides a block diagram of a circuit breaker opening and closing circuit monitor provided by an embodiment of the present invention;

[0061] Figure 8 A schematic diagram of a prototype of a circuit breaker opening and closing circuit monitor provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0062] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0063] Aiming at the problem of low monitoring accuracy of the existing circuit breaker opening and closing circuit, the embodiment of the present invention provides a circuit breaker opening and closing circuit monitoring system, such as Figure 1 As shown, the system includes:

[0064] The circuit breaker auxiliary contact 100 and the circuit breaker opening and closing circuit monitor 200 include a switch input circuit 210, a first voltage monitoring circuit 220, a second voltage monitoring circuit 230, a central control module 240 and an alarm circuit 250.

[0065] Among them, the switch input circuit 210 is connected to the auxiliary contact 100 of the circuit breaker, and the auxiliary contact status is collected through the switch input circuit 210; the two input contacts of the first voltage monitoring circuit 220 are respectively connected to the two ends of the normally closed contact of the circuit breaker in the circuit breaker closing circuit, and the first voltage value at both ends of the normally closed contact of the circuit breaker is collected through the first voltage monitoring circuit 220; the two input contacts of the second voltage monitoring circuit 230 are respectively connected to the two ends of the normally open contact of the circuit breaker in the circuit breaker opening circuit, and the second voltage value at both ends of the normally open contact of the circuit breaker is collected through the second voltage monitoring circuit 230; The central control module 240 obtains a preset voltage threshold and the auxiliary contact state. When the circuit breaker is determined to be in a closed state based on the auxiliary contact state and the first voltage value is less than the preset voltage threshold, the alarm circuit 250 outputs a closing circuit alarm signal in the closed state. When the circuit breaker is determined to be in an open state based on the auxiliary contact state and the second voltage value is less than the preset voltage threshold, the alarm circuit 250 outputs an opening circuit alarm signal in the open state. The alarm circuit 250 outputs an alarm signal under the control of the central control module 230.

[0066] The circuit breaker opening and closing circuit is the circuit that controls the opening and closing of the circuit breaker, and includes two circuits: the closing circuit and the opening circuit. Figure 2 As shown, the existing opening and closing circuit is connected in parallel at both ends of the closing circuit and the opening circuit, and is connected to a ±220V power supply. The closing circuit includes a manual control switch of a circuit breaker connected in series, a normally closed contact of the circuit breaker, and a closing coil; the opening circuit includes a manual control switch of a circuit breaker connected in series, a normally open contact of the circuit breaker, and an opening coil.

[0067] In the embodiment of the present invention, in order to monitor whether the circuit of the circuit breaker opening and closing circuit is intact, the first voltage monitoring circuit 220 of the circuit breaker opening and closing circuit monitor 200 is connected to both ends of the normally closed contacts of the circuit breaker in the closing circuit to collect the first voltage value at both ends of the normally closed contacts of the circuit breaker in the closing circuit. The second voltage monitoring circuit 230 is connected to both ends of the normally open contacts of the circuit breaker in the opening circuit to collect the second voltage value at both ends of the normally open contacts of the circuit breaker in the opening circuit. Figure 3Taking the closing circuit connection diagram of the circuit breaker opening and closing circuit monitor as an example, the two input contacts of the first voltage monitoring circuit of the circuit breaker opening and closing circuit monitor are respectively connected to the A and B contacts of the normally closed contacts of the circuit breaker in the closing circuit. When the circuit breaker is in the closed state, the normally closed contact of the circuit breaker in the closing circuit is disconnected. At this time, if the circuit is intact, there is a voltage difference of 220V between points A and B, that is, the first voltage value is 220V. If the voltage difference between points A and B disappears, that is, the first voltage value is less than the preset voltage threshold, it can be determined that the closing circuit is interrupted. Among them, the preset voltage threshold can be a voltage value of 0 or close to 0, which can be customized according to actual needs. For the same reason, if Figure 4 The schematic diagram of the connection of the opening circuit of the circuit breaker opening and closing circuit monitor shown is shown. In the opening circuit, when the circuit breaker is in the open state, the normally open contact of the circuit breaker in the opening circuit is disconnected. At this time, if the circuit is intact, there is a voltage difference of 220V between points C and D, that is, the second voltage value is 220V. If the voltage difference between points C and D disappears, that is, the second voltage value is less than the preset voltage threshold, it can be determined that the opening circuit is interrupted. The above-mentioned comparison result based on the preset voltage threshold and the first voltage value or the second voltage value, and the judgment process of the circuit breaker opening and closing state are executed by the central control module 240, and when it is determined that the circuit is interrupted, an alarm signal is output through the alarm circuit. The alarm signal can be notified to the on-site operation and maintenance personnel in one or more ways of sound, light, and electricity, and the embodiment of the present invention does not make specific limitations.

[0068] The opening and closing status of the circuit breaker is collected through the switch input circuit 210 of the circuit breaker opening and closing circuit monitor 200. Figure 3 Taking the closing circuit connection diagram shown in the figure as an example, the switching input circuit is connected to the auxiliary contacts of the circuit breaker to collect the connection status (auxiliary contact status) of the circuit breaker auxiliary contacts. Since the auxiliary contact status switches synchronously with the opening and closing status of the circuit breaker, the current opening and closing status of the circuit breaker can be determined based on the auxiliary contact status.

[0069] It should be noted that both the first and second voltage monitoring circuits include high-impedance resistor divider circuits. Specifically, the internal resistance of the resistor divider circuits is greater than 20MΩ. Due to the high impedance of the first and second voltage monitoring circuits, when connected in parallel with the normally open or normally closed contacts of the circuit breaker, they do not divert current from the opening or closing circuits, thereby affecting the normal operation of the circuits. In other words, the operation of the opening and closing circuits is not affected during the voltage acquisition process.

[0070] In one embodiment of the present invention, for further explanation and limitation, when the circuit breaker opening and closing circuit is connected to the circuit breaker mechanism anti-trip circuit, the system includes a voltage dividing resistor.

[0071] Among them, through the voltage dividing resistor, before the first voltage monitoring circuit collects the first voltage value, the normally closed contacts of the circuit breaker and the normally closed contacts of the anti-trip relay connected in series in the circuit breaker closing circuit are replaced, so that the voltage dividing of the opening position relay and the anti-trip relay are adjusted to be less than their respective starting voltages, and the first voltage monitoring circuit can be turned on.

[0072] When the circuit breaker to be monitored is equipped with an internal mechanism anti-tripping mechanism, that is, when the circuit breaker opening and closing circuit is connected to the circuit breaker mechanism anti-tripping circuit, the circuit breaker closing circuit is added with circuit breaker contacts, anti-tripping relays, and anti-tripping relay normally open (normally closed) contacts. This adds a series connection of newly added circuit breaker normally closed contacts and anti-tripping relay normally closed contacts to the circuit breaker closing circuit to prevent the opening position relay and the anti-tripping relay from starting each other. Figure 5 As shown in the figure, the closing circuit has been added with an anti-trip relay, a normally closed contact of the anti-trip relay, and a normally open contact of the anti-trip relay. A new breakpoint, the normally closed contact of the circuit breaker, has also been added. When the circuit breaker is closed, the normally closed contact of the new circuit breaker is open. At this point, the circuit is non-conductive, and the voltage between points A and B is zero, which does not meet the connection requirements of the circuit breaker opening and closing circuit monitor.

[0073] In the embodiment of the present invention, the normally closed contacts of the newly added circuit breaker and the normally closed contacts of the anti-trip relay connected in series in the closing circuit are replaced with voltage-dividing resistors. Figure 6 As shown. Among them, the voltage-dividing resistor is a high-impedance voltage-dividing resistor of more than kilo-ohm level. By replacing the series circuit of the newly added normally closed contact of the circuit breaker and the normally closed contact of the anti-tripping relay with a voltage-dividing resistor, the voltage across the opening position relay and the anti-tripping relay is reduced in a voltage-dividing manner, so that the voltage across the opening position relay and the anti-tripping relay is less than their corresponding starting voltage, and at the same time, the conduction state of the closing circuit is ensured. Through the above-mentioned transformation, the closing circuit meets the anti-tripping requirements while meeting the access conditions of the circuit breaker closing circuit monitor. Therefore, when the circuit breaker closing circuit is connected to the anti-tripping circuit of the circuit breaker mechanism, the anti-tripping mechanism is guaranteed and the normal monitoring of the opening and closing circuit by the circuit breaker opening and closing circuit monitor is realized.

[0074] In one embodiment of the present invention, for further explanation and limitation, the switch input circuit includes a first switch input circuit and a second switch input circuit.

[0075] Among them, the state of the normally closed auxiliary contact of the circuit breaker is collected through the first switch input circuit; the state of the normally closed auxiliary contact of the circuit breaker is collected through the second switch input circuit; through the central control module, when the state of the normally closed auxiliary contact of the circuit breaker is disconnected, the circuit breaker is determined to be in the closed state; when the state of the normally open auxiliary contact of the circuit breaker is disconnected, the circuit breaker is determined to be in the open state.

[0076] In an embodiment of the present invention, the circuit breaker opening and closing circuit monitor provides two first switching input circuits and a second switching input circuit, which can respectively form a circuit combination with the first voltage monitoring circuit and the second voltage monitoring circuit to monitor the opening circuit or the closing circuit separately. That is, the first switching input circuit collects the state of the circuit breaker's normally closed auxiliary contact, and the first voltage monitoring circuit collects the voltage across the normally closed contact of the circuit breaker in the closing circuit. When the state of the circuit breaker's normally closed auxiliary contact is disconnected and the first voltage value is less than the preset voltage threshold, it indicates that the voltage difference across the normally closed contact of the circuit breaker in the closing circuit is reduced in the closed state, and it can be determined that the closing circuit is abnormal in the closed state. Similarly, the second switching input circuit collects the state of the circuit breaker's normally open auxiliary contact, and the second voltage monitoring circuit collects the voltage across the normally open contact of the circuit breaker in the opening circuit. When the state of the circuit breaker's normally open auxiliary contact is disconnected and the second voltage value is less than the preset voltage threshold, it can be determined that the opening circuit is abnormal in the opening state. By configuring two switching input circuits to respectively collect the status of the normally open auxiliary contacts and the normally closed auxiliary contacts of the circuit breaker, the opening and closing status of the circuit breaker can be judged more accurately, and independent monitoring of the closing circuit and the opening circuit can be achieved, thereby improving the flexibility of monitoring.

[0077] In one embodiment of the present invention, for further explanation and limitation, the system further includes a control loop disconnection circuit, and the alarm circuit includes a first alarm circuit and a second alarm circuit.

[0078] Among them, a closing circuit alarm signal is output through the first alarm circuit, and an opening circuit alarm signal is output through the second alarm circuit. Through the central control module, when the normally closed auxiliary contact state of the circuit breaker is closed, the output of the first alarm circuit is suppressed to output the closing circuit alarm signal in the opening state through the control circuit disconnection circuit; when the normally open auxiliary contact state of the circuit breaker is closed, the output of the second alarm circuit is suppressed to output the opening circuit alarm signal in the closing state through the control circuit disconnection circuit. The control circuit disconnection circuit includes a normally closed contact of a closing position relay and a normally closed contact of an opening position relay connected in series. When the normally closed contact of the closing position relay and the normally closed contact of the opening position relay are both closed, the control circuit disconnection circuit outputs an opening circuit alarm signal in the closing state or a closing circuit alarm signal in the opening state according to the opening and closing states of the circuit breaker, that is, the closing circuit alarm signal is output when the circuit breaker is in the opening state, and the opening circuit alarm signal is output when the circuit breaker is in the closing state.

[0079] In an embodiment of the present invention, the output contacts of the first alarm circuit and the second alarm circuit are connected to the output end of the control circuit disconnection circuit to output an alarm signal in parallel with the control circuit disconnection circuit. Specifically, when the circuit breaker is in the closed state, the first alarm circuit outputs an abnormality in the closing circuit, and the control circuit disconnection circuit outputs an abnormality in the opening circuit; when the circuit breaker is in the open state, the control circuit disconnection circuit outputs an abnormality in the closing circuit, and the second alarm circuit outputs an abnormality in the opening circuit. It should be noted that when the circuit breaker is in the open state (the normally closed auxiliary contact of the circuit breaker is closed), the normally closed contact of the closing circuit is closed, which is equivalent to a circuit disconnection condition. To prevent false alarms in this state, the output of the first alarm circuit is suppressed when the normally closed auxiliary contact of the circuit breaker is closed, and the monitoring result of the closing circuit is determined based on the output of the control circuit disconnection circuit. When the circuit breaker is closed (the normally open auxiliary contact is closed), the normally open contact of the opening circuit is closed, equivalent to a circuit disconnection. To prevent false alarms in this state, the output of the second alarm circuit is suppressed when the normally open auxiliary contact is closed. The monitoring result of the opening circuit is determined based on the output of the control circuit disconnection circuit. A 24V DC voltage is input to the normally open and normally closed auxiliary contacts of the circuit breaker via a switching circuit to monitor the open and closed states of the auxiliary contacts.

[0080] In one embodiment of the present invention, for further illustration and limitation, the first voltage monitoring circuit includes a first sampling circuit, a first amplifying circuit, and a first analog-to-digital conversion circuit, and the second voltage detection circuit includes a second sampling circuit, a second amplifying circuit, and a second analog-to-digital conversion circuit;

[0081] Among them, a first voltage analog signal at both ends of the normally closed contacts of the circuit breaker in the circuit breaker closing circuit is collected through a first sampling circuit; a first amplifying circuit is used to amplify the first voltage analog signal to obtain the amplified first voltage analog signal; a first analog-to-digital conversion circuit is used to convert the amplified first voltage analog signal into a digital signal to obtain a first voltage value; a second sampling circuit is used to collect a second voltage analog signal at both ends of the normally open contacts of the circuit breaker in the circuit breaker opening circuit; a second amplifying circuit is used to amplify the second voltage analog signal to obtain the amplified second voltage analog signal; a second analog-to-digital conversion circuit is used to convert the amplified second voltage analog signal into a digital signal to obtain a second voltage value.

[0082] In the embodiment of the present invention, the structural block diagram of the circuit breaker opening and closing circuit monitor can be as follows: Figure 7As shown, it includes a first voltage sampling circuit, a first amplifying circuit and a first analog-to-digital conversion circuit, a second voltage sampling circuit, a second amplifying circuit and a second analog-to-digital conversion circuit, a human-computer interaction module, a first switch input circuit, a second switch input circuit, an alarm circuit, a communication module, a power management module, a storage module and a switch output module. Among them, the central control module can be a microcontroller or a single-chip microcomputer. The human-computer interaction module provides interactive operations such as display and setting of operating parameters, status, and potential values, and can be an OLED display screen. The alarm circuit provides one or two pairs of empty contact alarm output modes. The communication module provides a channel for remote data interaction. The storage module is used to store preset voltage thresholds and other threshold data, monitoring modes, alarm modes and other operating parameters. The switch output module is used for hard contact output of operation and alarm status. As shown Figure 8 The following is a schematic diagram of a prototype circuit breaker opening and closing circuit monitor. 1 is the OLED display, 2 is the LED indicator light; red indicates an alarm state, and green indicates an operating state. 3 is a button, and the button functions are shown in Table 1 below.

[0083] Table 1:

[0084]

[0085] The present invention provides a circuit breaker opening and closing circuit monitoring system. In an embodiment of the present invention, a switch input circuit is connected to the auxiliary contact of the circuit breaker, and the auxiliary contact state is collected through the switch input circuit; two input contacts of a first voltage monitoring circuit are respectively connected to the two ends of a normally closed contact of the circuit breaker in the circuit breaker closing circuit, and a first voltage value at both ends of the normally closed contact of the circuit breaker is collected through the first voltage monitoring circuit; two input contacts of a second voltage monitoring circuit are respectively connected to the two ends of a normally open contact of the circuit breaker in the circuit breaker opening circuit, and a second voltage value at both ends of the normally open contact of the circuit breaker is collected through the second voltage monitoring circuit; a preset voltage threshold and the auxiliary contact state are obtained through a central control module, and the auxiliary contact state is obtained according to the auxiliary contact state. When the state of the auxiliary contact determines that the circuit breaker is in the closed state and the first voltage value is less than the preset voltage threshold, the alarm circuit outputs a closing circuit alarm signal in the closed state; when the state of the auxiliary contact determines that the circuit breaker is in the open state and the second voltage value is less than the preset voltage threshold, the alarm circuit outputs an opening circuit alarm signal in the open state; under the control of the central control module, the alarm circuit outputs the alarm signal, thereby realizing the monitoring of the closing circuit in the closed state of the circuit breaker and the opening circuit in the open state of the circuit breaker, greatly increasing the comprehensiveness of the monitoring of the closing and opening circuits of the circuit breaker, filling the gaps in the existing monitoring means, and thus improving the accuracy of the monitoring of the closing and opening circuits of the circuit breaker.

[0086] Furthermore, as a response to the above Figure 1In order to realize the system shown in FIG, an embodiment of the present invention provides a circuit breaker opening and closing circuit monitoring method, the method comprising:

[0087] Obtaining a preset voltage threshold and an auxiliary contact state collected by a switch input circuit, wherein the switch input circuit is connected to the auxiliary contact of the circuit breaker, and the auxiliary contact state switches synchronously with the opening and closing state of the circuit breaker;

[0088] collecting a first voltage value at both ends of a normally closed contact of a circuit breaker in the circuit breaker closing circuit through two input contacts of a first voltage monitoring circuit, wherein the two input contacts of the first voltage monitoring circuit are respectively connected to both ends of the normally closed contact of the circuit breaker in the circuit breaker closing circuit;

[0089] collecting a second voltage value at both ends of a normally open contact of a circuit breaker in the circuit breaker tripping circuit through two input contacts of a second voltage monitoring circuit, wherein the two input contacts of the second voltage monitoring circuit are respectively connected to both ends of the normally open contact of the circuit breaker in the circuit breaker tripping circuit;

[0090] When it is determined that the circuit breaker is in the closed state according to the auxiliary contact state and the first voltage value is less than the preset voltage threshold, the alarm circuit is controlled to output a closing circuit alarm signal in the closed state;

[0091] When it is determined that the circuit breaker is in the open state according to the auxiliary contact state, and the second voltage value is less than the preset voltage threshold, controlling the alarm circuit to output an open circuit alarm signal in the open state;

[0092] Wherein, the first voltage monitoring circuit and the second voltage monitoring circuit both include a high-impedance resistor voltage divider circuit so as not to affect the operation of the opening and closing circuit during the voltage acquisition process.

[0093] Furthermore, when the circuit breaker opening and closing circuit is connected to the circuit breaker mechanism anti-trip circuit, the circuit breaker closing circuit includes a newly added circuit breaker normally closed contact and an anti-trip relay normally closed contact connected in series to inhibit the opening position relay and the anti-trip relay from activating each other; before collecting the first voltage value across the normally closed contact of the circuit breaker in the circuit breaker closing circuit through the two input contacts of the first voltage monitoring circuit, the method further includes:

[0094] The newly added circuit breaker normally closed contacts and the anti-trip relay normally closed contacts connected in series in the circuit breaker closing circuit are replaced with voltage dividing resistors so that the divided voltages of the regulating opening position relay and the anti-trip relay are respectively less than their respective starting voltages, and the first voltage monitoring circuit can be turned on.

[0095] Furthermore, the switching input circuit includes a first switching input circuit and a second switching input circuit, and the auxiliary contact state includes a circuit breaker normally closed auxiliary contact state and a circuit breaker normally closed auxiliary contact state; determining the circuit breaker opening and closing state according to the auxiliary contact state includes:

[0096] collecting the state of the normally closed auxiliary contact of the circuit breaker through the first switching value input circuit, and determining that the circuit breaker is in the closed state when the normally closed auxiliary contact of the circuit breaker is in the open state;

[0097] The state of the normally open auxiliary contact of the circuit breaker is collected through the second switching input circuit. When the state of the normally open auxiliary contact of the circuit breaker is disconnected, it is determined that the circuit breaker is in the open state.

[0098] Furthermore, the alarm circuit includes a first alarm circuit and a second alarm circuit, wherein the output contacts of the first alarm circuit and the second alarm circuit are connected to the output end of the control loop disconnection circuit to output an alarm signal in parallel with the control loop disconnection circuit, and the control loop disconnection circuit includes a normally closed contact of a closing position relay and a normally closed contact of an opening position relay connected in series. When the normally closed contact of the closing position relay and the normally closed contact of the opening position relay are both closed, the control loop disconnection circuit outputs an opening circuit alarm signal in a closing state or a closing circuit alarm signal in an opening state according to the state of the circuit breaker;

[0099] When the normally closed auxiliary contact of the circuit breaker is in a closed state, the output of the first alarm circuit is suppressed to output a closing circuit alarm signal in an open state through the control circuit disconnection circuit;

[0100] When the normally open auxiliary contact of the circuit breaker is in a closed state, the output of the second alarm circuit is suppressed, so as to output an opening circuit alarm signal in a closed state through the control circuit disconnection circuit.

[0101] Furthermore, the first voltage monitoring circuit includes a first sampling circuit, a first amplifying circuit and a first analog-to-digital conversion circuit, and the second voltage detection circuit includes a second sampling circuit, a second amplifying circuit and a second analog-to-digital conversion circuit;

[0102] The collecting of the first voltage values at both ends of the normally closed contacts of the circuit breaker in the circuit breaker closing circuit through the two input contacts of the first voltage monitoring circuit includes:

[0103] collecting, by the first sampling circuit, a first voltage analog signal at both ends of a normally closed contact of a circuit breaker in a circuit breaker closing circuit, amplifying the first voltage analog signal by the first amplifying circuit to obtain an amplified first voltage analog signal, and converting the amplified first voltage analog signal by the first analog-to-digital conversion circuit into a digital signal to obtain a first voltage value;

[0104] The collecting of the second voltage value at both ends of the normally open contacts of the circuit breaker in the circuit breaker tripping circuit through the two input contacts of the second voltage monitoring circuit includes:

[0105] The second sampling circuit collects a second voltage analog signal at both ends of the normally open contacts of the circuit breaker in the circuit breaker tripping circuit, the second voltage analog signal is amplified by the second amplifying circuit to obtain an amplified second voltage analog signal, and the second analog-to-digital conversion circuit converts the amplified second voltage analog signal into a digital signal to obtain a second voltage value.

[0106] The present invention provides a circuit breaker opening and closing circuit monitoring method. In an embodiment of the present invention, a switch input circuit is connected to an auxiliary contact of the circuit breaker, and the auxiliary contact state is collected through the switch input circuit; two input contacts of a first voltage monitoring circuit are respectively connected to two ends of a normally closed contact of the circuit breaker in the circuit breaker closing circuit, and a first voltage value at two ends of the normally closed contact of the circuit breaker is collected through the first voltage monitoring circuit; two input contacts of a second voltage monitoring circuit are respectively connected to two ends of a normally open contact of the circuit breaker in the circuit breaker opening circuit, and a second voltage value at two ends of the normally open contact of the circuit breaker is collected through the second voltage monitoring circuit; a preset voltage threshold and the auxiliary contact state are obtained through a central control module, and the auxiliary contact state is obtained according to the auxiliary contact state. When the state of the auxiliary contact determines that the circuit breaker is in the closed state and the first voltage value is less than the preset voltage threshold, the alarm circuit outputs a closing circuit alarm signal in the closed state; when the state of the auxiliary contact determines that the circuit breaker is in the open state and the second voltage value is less than the preset voltage threshold, the alarm circuit outputs an opening circuit alarm signal in the open state; under the control of the central control module, the alarm circuit outputs the alarm signal, thereby realizing the monitoring of the closing circuit in the closed state of the circuit breaker and the opening circuit in the open state of the circuit breaker, greatly increasing the comprehensiveness of the monitoring of the closing and opening circuits of the circuit breaker, filling the gaps in the existing monitoring means, and thus improving the accuracy of the monitoring of the closing and opening circuits of the circuit breaker.

[0107] Obviously, those skilled in the art will appreciate that the various modules or steps of the present invention described above can be implemented using a general-purpose computing device, centralized on a single computing device, or distributed across a network of multiple computing devices. Alternatively, they can be implemented using program code executable by a computing device, which can then be stored in a storage device and executed by the computing device. In some cases, the steps shown or described can be performed in a different order than that shown, or can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0108] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A circuit breaker opening and closing circuit monitoring system, characterized in that: It includes a circuit breaker auxiliary contact and a circuit breaker opening and closing circuit monitor, and the circuit breaker opening and closing circuit monitor includes a switch input circuit, a first voltage monitoring circuit, a second voltage monitoring circuit, a central control module and an alarm circuit; The switch input circuit is connected to the auxiliary contact of the circuit breaker and is used to collect the state of the auxiliary contact, wherein the state of the auxiliary contact switches synchronously with the opening and closing state of the circuit breaker; The two input contacts of the first voltage monitoring circuit are respectively connected to the two ends of the normally closed contact of the circuit breaker in the circuit breaker closing circuit, and are used to collect the first voltage value at the two ends of the normally closed contact of the circuit breaker; The two input contacts of the second voltage monitoring circuit are respectively connected to the two ends of the normally open contact of the circuit breaker in the circuit breaker tripping circuit, and are used to collect the second voltage value at the two ends of the normally open contact of the circuit breaker; The central control module is configured to obtain a preset voltage threshold and the auxiliary contact state, and output a closing circuit alarm signal in the closing state through an alarm circuit when the circuit breaker is determined to be in the closed state based on the auxiliary contact state and the first voltage value is less than the preset voltage threshold; and output an opening circuit alarm signal in the opening state through the alarm circuit when the circuit breaker is determined to be in the open state based on the auxiliary contact state and the second voltage value is less than the preset voltage threshold; The alarm circuit is used to output an alarm signal under the control of the central control module; Wherein, the first voltage monitoring circuit and the second voltage monitoring circuit both include a high-impedance resistor voltage divider circuit so as not to affect the operation of the opening and closing circuit during the voltage acquisition process.

2. The circuit breaker opening and closing circuit monitoring system according to claim 1, characterized in that: In the case where the circuit breaker opening and closing circuit is connected to the circuit breaker mechanism anti-trip circuit, the circuit breaker closing circuit includes a newly added circuit breaker normally closed contact and an anti-trip relay normally closed contact connected in series to inhibit the opening position relay and the anti-trip relay from actuating each other, and the system includes a voltage dividing resistor; The voltage-dividing resistor is used to replace the normally closed contacts of the circuit breaker and the normally closed contacts of the anti-trip relay connected in series in the circuit breaker closing circuit before the first voltage monitoring circuit collects the first voltage value, so that the voltage division of the opening position relay and the anti-trip relay is adjusted to be less than their respective starting voltages, and the first voltage monitoring circuit can be turned on, wherein the newly added normally closed contacts of the circuit breaker in the circuit breaker closing circuit are connected in series with the normally closed contacts of the anti-trip relay to inhibit the opening position relay and the anti-trip relay from starting each other.

3. The circuit breaker opening and closing circuit monitoring system according to claim 1, characterized in that: The switch value input circuit includes a first switch value input circuit and a second switch value input circuit; The first switching input circuit is used to collect the status of the normally closed auxiliary contact of the circuit breaker; The second switching input circuit is used to collect the status of the normally open auxiliary contact of the circuit breaker; The central control module is further configured to determine that the circuit breaker is in a closed state when the normally closed auxiliary contact of the circuit breaker is disconnected; and to determine that the circuit breaker is in an open state when the normally open auxiliary contact of the circuit breaker is disconnected.

4. The circuit breaker opening and closing circuit monitoring system according to claim 3, characterized in that: The system further comprises a control loop disconnection circuit, and the alarm circuit comprises a first alarm circuit and a second alarm circuit; The control circuit disconnection circuit includes a normally closed contact of a closing position relay and a normally closed contact of an opening position relay connected in series. When the normally closed contact of the closing position relay and the normally closed contact of the opening position relay are both closed, the control circuit disconnection circuit outputs an opening circuit alarm signal in a closing state or a closing circuit alarm signal in an opening state according to the opening and closing states of the circuit breaker; The first alarm circuit is used to output a closing circuit alarm signal, and the second alarm circuit is used to output an opening circuit alarm signal, wherein the output contacts of the first alarm circuit and the second alarm circuit are connected to the output end of the control circuit disconnection circuit to output the alarm signal in parallel with the control circuit disconnection circuit; The central control module is further configured to suppress the output of the first alarm circuit when the normally closed auxiliary contact of the circuit breaker is closed, so as to output a closing circuit alarm signal in the opening state through the control circuit disconnection circuit; and to suppress the output of the second alarm circuit when the normally open auxiliary contact of the circuit breaker is closed, so as to output an opening circuit alarm signal in the closing state through the control circuit disconnection circuit.

5. The circuit breaker opening and closing circuit monitoring system according to claim 1, characterized in that: The first voltage monitoring circuit includes a first sampling circuit, a first amplifying circuit and a first analog-to-digital conversion circuit, and the second voltage monitoring circuit includes a second sampling circuit, a second amplifying circuit and a second analog-to-digital conversion circuit; The first sampling circuit is used to collect a first voltage analog signal at both ends of the normally closed contacts of the circuit breaker in the circuit breaker closing circuit; The first amplifier circuit is used to amplify the first voltage analog signal to obtain an amplified first voltage analog signal; The first analog-to-digital conversion circuit is configured to convert the amplified first voltage analog signal into a digital signal to obtain a first voltage value; The second sampling circuit is used to collect a second voltage analog signal at both ends of the normally open contacts of the circuit breaker in the circuit breaker tripping circuit; The second amplifier circuit is configured to amplify the second voltage analog signal to obtain an amplified second voltage analog signal; The second analog-to-digital conversion circuit is used to convert the amplified second voltage analog signal into a digital signal to obtain a second voltage value.

6. A circuit breaker opening and closing circuit monitoring method, characterized in that: include: Obtaining a preset voltage threshold and an auxiliary contact state collected by a switch input circuit, wherein the switch input circuit is connected to the auxiliary contact of the circuit breaker, and the auxiliary contact state switches synchronously with the opening and closing state of the circuit breaker; collecting a first voltage value at both ends of a normally closed contact of a circuit breaker in the circuit breaker closing circuit through two input contacts of a first voltage monitoring circuit, wherein the two input contacts of the first voltage monitoring circuit are respectively connected to both ends of the normally closed contact of the circuit breaker in the circuit breaker closing circuit; collecting a second voltage value at both ends of a normally open contact of a circuit breaker in the circuit breaker tripping circuit through two input contacts of a second voltage monitoring circuit, wherein the two input contacts of the second voltage monitoring circuit are respectively connected to both ends of the normally open contact of the circuit breaker in the circuit breaker tripping circuit; When it is determined that the circuit breaker is in the closed state according to the auxiliary contact state and the first voltage value is less than the preset voltage threshold, the alarm circuit is controlled to output a closing circuit alarm signal in the closed state; When it is determined that the circuit breaker is in the open state according to the auxiliary contact state, and the second voltage value is less than the preset voltage threshold, controlling the alarm circuit to output an open circuit alarm signal in the open state; Wherein, the first voltage monitoring circuit and the second voltage monitoring circuit both include a high-impedance resistor voltage divider circuit so as not to affect the operation of the opening and closing circuit during the voltage acquisition process.

7. The method according to claim 6, characterized in that In a case where the circuit breaker opening and closing circuit is connected to the circuit breaker mechanism anti-trip circuit, the circuit breaker closing circuit includes a newly added circuit breaker normally closed contact and an anti-trip relay normally closed contact connected in series, so as to inhibit the opening position relay and the anti-trip relay from activating each other; before collecting the first voltage value across the normally closed contact of the circuit breaker in the circuit breaker closing circuit through the two input contacts of the first voltage monitoring circuit, the method further includes: The newly added circuit breaker normally closed contacts and the anti-trip relay normally closed contacts connected in series in the circuit breaker closing circuit are replaced with voltage dividing resistors so that the divided voltages of the regulating opening position relay and the anti-trip relay are respectively less than their respective starting voltages, and the first voltage monitoring circuit can be turned on.

8. The method according to claim 6, characterized in that The switch value input circuit includes a first switch value input circuit and a second switch value input circuit, and the auxiliary contact state includes a circuit breaker normally closed auxiliary contact state and a circuit breaker normally closed auxiliary contact state; Determine the circuit breaker opening and closing status based on the auxiliary contact status, including: collecting the state of the normally closed auxiliary contact of the circuit breaker through the first switching value input circuit, and determining that the circuit breaker is in the closed state when the normally closed auxiliary contact of the circuit breaker is in the open state; The state of the normally open auxiliary contact of the circuit breaker is collected through the second switching input circuit. When the state of the normally open auxiliary contact of the circuit breaker is disconnected, it is determined that the circuit breaker is in the open state.

9. The method according to claim 6, characterized in that The alarm circuit includes a first alarm circuit and a second alarm circuit, wherein the output contacts of the first alarm circuit and the second alarm circuit are connected to the output end of the control loop disconnection circuit to output an alarm signal in parallel with the control loop disconnection circuit, and the control loop disconnection circuit includes a normally closed contact of a closing position relay and a normally closed contact of an opening position relay connected in series. When the normally closed contact of the closing position relay and the normally closed contact of the opening position relay are both closed, the control loop disconnection circuit outputs an opening circuit alarm signal in a closing state or a closing circuit alarm signal in an opening state according to the state of the circuit breaker; When the normally closed auxiliary contact of the circuit breaker is in a closed state, the output of the first alarm circuit is suppressed to output a closing circuit alarm signal in an open state through the control circuit disconnection circuit; When the normally open auxiliary contact of the circuit breaker is in a closed state, the output of the second alarm circuit is suppressed, so as to output an opening circuit alarm signal in a closed state through the control circuit disconnection circuit.

10. The method according to claim 6, characterized in that The first voltage monitoring circuit includes a first sampling circuit, a first amplifying circuit and a first analog-to-digital conversion circuit, and the second voltage monitoring circuit includes a second sampling circuit, a second amplifying circuit and a second analog-to-digital conversion circuit; The collecting of the first voltage values at both ends of the normally closed contacts of the circuit breaker in the circuit breaker closing circuit through the two input contacts of the first voltage monitoring circuit includes: collecting, by the first sampling circuit, a first voltage analog signal at both ends of a normally closed contact of a circuit breaker in a circuit breaker closing circuit, amplifying the first voltage analog signal by the first amplifying circuit to obtain an amplified first voltage analog signal, and converting the amplified first voltage analog signal by the first analog-to-digital conversion circuit into a digital signal to obtain a first voltage value; The collecting of the second voltage value at both ends of the normally open contacts of the circuit breaker in the circuit breaker tripping circuit through the two input contacts of the second voltage monitoring circuit includes: The second sampling circuit collects a second voltage analog signal at both ends of the normally open contacts of the circuit breaker in the circuit breaker tripping circuit, the second voltage analog signal is amplified by the second amplifying circuit to obtain an amplified second voltage analog signal, and the second analog-to-digital conversion circuit converts the amplified second voltage analog signal into a digital signal to obtain a second voltage value.

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