Analog circuit breaker

Abstract

The invention provides an analog circuit breaker, and relates to the technical field of power system automation. The analog circuit breaker comprises an isolation unit which receives the reference voltage output by the processing unit and transmits the reference voltage to an interface unit in an isolated manner. The interface unit receives a pulse signal which is sent by the relay protection device and is used for indicating tripping or closing; when the voltage of the pulse signal is greater than or equal to the reference voltage corresponding to the pulse signal, outputting a high-level signal; otherwise, outputting a low-level signal. The isolation unit also isolates and transmits the level signal to the processing unit. And when the processing unit detects that the input is a high-level signal, the processing unit controls the tripping and closing relay to execute an operation corresponding to the pulse signal and outputs a tripping and closing state signal corresponding to the pulse signal. The isolation unit is arranged, the interface unit and the processing unit are electrically isolated, safety protection is achieved, the signal integrity is improved, the safety, stability and accuracy of the analog circuit breaker are improved, and then the safety and accuracy of testing are improved.

Description

Technical Field

[0001] This application relates to the technical field of power system automation, and particularly to an analog circuit breaker. Background Art

[0002] In the technical field of power system automation, the performance test of relay protection devices is one of the key links to ensure the safe and stable operation of power systems. Traditional relay protection test methods rely on actual high-voltage circuit breakers for tripping and closing operations to verify the accuracy and reliability of relay protection devices. However, traditional methods have many deficiencies: First, frequent operation of high-voltage circuit breakers can cause mechanical wear, shorten their service life, and may increase the probability of failures. Second, during the commissioning of infrastructure projects, high-voltage circuit breakers may not be installed yet or cannot cooperate with the test due to maintenance or other reasons, resulting in obstacles to relay protection commissioning work. In addition, the operation of high-voltage circuit breakers requires professional personnel to carry out in a specific environment, restricting the flexibility and efficiency of testing.

[0003] With the continuous development of circuit breaker technology, analog circuit breakers can be used to test relay protection devices. However, current analog circuit breakers have limitations in terms of safety and cannot meet the new requirements for relay protection testing in modern power systems. Summary of the Invention

[0004] This application provides an analog circuit breaker to improve test safety and meet the new requirements for relay protection testing in modern power systems.

[0005] In a first aspect, this application provides an analog circuit breaker, including: an isolation unit, and an interface unit and a processing unit electrically connected to the isolation unit; wherein,

[0006] The processing unit is configured to output a reference voltage to the isolation unit, and the reference voltage includes a tripping reference voltage and a closing reference voltage;

[0007] The isolation unit is configured to isolate and transmit the reference voltage to the interface unit;

[0008] The interface unit is connected to the relay protection device and is configured to receive a pulse signal sent by the relay protection device, where the pulse signal is used to indicate tripping or closing; and output a high-level signal when the voltage of the pulse signal is greater than or equal to the reference voltage corresponding to the pulse signal; and output a low-level signal when the voltage of the pulse signal is less than the reference voltage corresponding to the pulse signal;

[0009] The isolation unit is further configured to isolate and transmit the high-level signal or the low-level signal to the processing unit;

[0010] The processing unit is further configured to, when detecting that the input is a high-level signal, control the trip and close relay in the analog circuit breaker to perform the operation corresponding to the pulse signal, so as to output a trip and close status signal corresponding to the pulse signal.

[0011] In a possible implementation manner, the isolation unit includes a linear optocoupler and a digital optocoupler, where:

[0012] The input end of the linear optocoupler serves as the first input end of the isolation unit and is used to connect to the processing unit; the output end of the linear optocoupler serves as the first output end of the isolation unit and is used to connect to the interface unit;

[0013] The input end of the digital optocoupler serves as the second input end of the isolation unit and is used to connect to the interface unit, and the output end of the digital optocoupler serves as the second output end of the isolation unit and is used to connect to the processing unit.

[0014] In a possible implementation manner, the interface unit includes a first detection circuit and a second detection circuit. The first detection circuit is used to connect to the trip pulse signal output end of the relay protection device, and the second detection circuit is used to connect to the close pulse signal output end of the relay protection device;

[0015] The first detection circuit is configured to receive a pulse signal for indicating a trip, and output a high-level signal when the voltage of the pulse signal is greater than or equal to the trip reference voltage; output a low-level signal when the voltage of the pulse signal is less than the trip reference voltage;

[0016] The second detection circuit is configured to receive a pulse signal for indicating a close, and output a high-level signal when the voltage of the pulse signal is greater than or equal to the close reference voltage; output a low-level signal when the voltage of the pulse signal is less than the close reference voltage.

[0017] In a possible implementation manner, the first detection circuit includes a first comparator, a first resistor, and a second resistor, and the second detection circuit includes a second comparator, a third resistor, and a fourth resistor; where:

[0018] The first end of the first resistor is used to connect to the trip pulse signal output end. The second end of the first resistor and the first end of the second resistor are connected to form a common connection end, and the common connection end is also connected to the positive input end of the first comparator. The second end of the second resistor is grounded; the output end of the first comparator is connected to the second input end of the isolation unit; the negative input end of the first comparator is connected to the first output end of the isolation unit;

[0019] The first end of the third resistor is used to connect to the closing pulse signal output terminal. The second end of the third resistor and the first end of the fourth resistor are connected to form a common connection terminal, and the common connection terminal is also connected to the positive input terminal of the second comparator. The second end of the fourth resistor is grounded; the output terminal of the second comparator is connected to the second input terminal of the isolation unit; the negative input terminal of the second comparator is connected to the first output terminal of the isolation unit.

[0020] In a possible implementation, the analog circuit breaker further includes a protection unit electrically connected to the processing unit; correspondingly, the processing unit is further configured to:

[0021] Monitor the input duration of the pulse signal; when the input duration is greater than or equal to the duration threshold, trigger the protection unit to cut off the test circuit corresponding to the pulse signal, and the test circuit includes a tripping circuit and a closing circuit; and generate a fault indication message to prompt relevant personnel to perform fault handling.

[0022] In a possible implementation, the protection unit includes a relay, a switching tube, a fifth resistor, a sixth resistor, a diode, and a capacitor; wherein:

[0023] The first end of the fifth resistor is commonly connected to the base of the switching tube to form a common connection terminal, and the common connection terminal serves as the connection terminal between the protection unit and the processing unit; the second end of the fifth resistor, the emitter of the switching tube, and the first end of the capacitor are commonly connected and then grounded; the collector of the switching tube, the first end of the relay, and the anode of the diode are commonly connected; the second end of the relay, the cathode of the diode, the second end of the capacitor, and the first end of the sixth resistor are commonly connected; the second end of the sixth resistor serves as the power input terminal of the protection unit;

[0024] The relay is used to control the disconnection of the test circuit corresponding to the pulse signal.

[0025] In a possible implementation, the processing unit is further configured to:

[0026] When detecting a reset signal for the fault indication message, trigger the protection unit to connect the test circuit corresponding to the pulse signal;

[0027] Correspondingly, the relay is further used to: control the connection of the test circuit corresponding to the pulse signal.

[0028] In a possible implementation, the analog circuit breaker further includes a communication unit electrically connected to the processing unit;

[0029] The communication unit integrates a wireless communication module, and the wireless communication module is used to establish a data connection with a remote management platform;

[0030] Correspondingly, the processing unit is further configured to: receive remote control instructions issued by the remote management platform to control and manage the analog circuit breaker, and the remote control instructions include at least one of parameter configuration, status query, and firmware upgrade, and the parameter configuration includes reference voltage configuration.

[0031] In a possible implementation, the analog circuit breaker further includes a display unit electrically connected to the processing unit;

[0032] The display unit is configured to receive the display information sent by the processing unit and visually output the display information, where the display information includes the opening and closing times, working status, voltage, current, and fault indication information of the analog circuit breaker.

[0033] In a possible implementation, the display unit includes: a serial port display screen, which is configured to visually display the display information on the serial port display screen based on the serial communication protocol.

[0034] In a possible implementation, the analog circuit breaker further includes a power supply unit, which is configured to provide a lithium power supply for the interface unit, isolation unit, processing unit, communication unit, display unit, and protection unit.

[0035] In a possible implementation, the analog circuit breaker further includes: an operation panel, on which there are terminals of the interface unit for connecting to a relay protection device. The terminals include a trip input terminal, a close input terminal, a trip / close common terminal, a trip position contact, a close position contact, and a trip / close common position contact. The trip input terminal, close input terminal, and trip / close common terminal are used to connect to the relay protection device to obtain the pulse signals sent by the relay protection device.

[0036] In a possible implementation, the operation panel further includes: a manual trip control and a manual close control. The manual trip control is configured to generate a trip pulse signal, and the manual close control is configured to generate a close pulse signal.

[0037] In a possible implementation, the operation panel further includes: a trip indicator light and a close indicator light; correspondingly, the processing unit is further configured to control the trip indicator light and the close indicator light according to the trip / close status signal.

[0038] The analog circuit breaker provided by this application includes an isolation unit, an interface unit, and a processing unit that are electrically connected to the isolation unit. Among them, the processing unit outputs a reference voltage to the isolation unit. The isolation unit isolates and transmits the reference voltage to the interface unit. The interface unit is connected to a relay protection device to receive a pulse signal for indicating tripping or closing sent by the relay protection device. When the voltage of the pulse signal is greater than or equal to the reference voltage corresponding to the pulse signal, a high-level signal is output. When the voltage of the pulse signal is less than the reference voltage corresponding to the pulse signal, a low-level signal is output. The isolation unit also isolates and transmits the high-level signal or low-level signal to the processing unit. When the processing unit detects that the input is a high-level signal, it controls the trip and close relay in the analog circuit breaker to perform the operation corresponding to the pulse signal, and finally outputs a trip and close state signal corresponding to the pulse signal. By setting the isolation unit, this application electrically isolates the interface unit and the processing unit to ensure safe isolation between the high-voltage main circuit loop connected to the interface unit and the low-voltage control circuit of the processing unit, block the potential difference, and achieve safety protection. In addition, electrical isolation is used to suppress signal interference from high voltage to low voltage circuits, improve signal integrity, thereby improving the safety, stability, and accuracy of the analog circuit breaker, and further enhancing the safety and accuracy of test operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0040] Figure 1 It is a schematic diagram of the application scenario of the analog circuit breaker provided by the embodiment of this application;

[0041] Figure 2 It is a schematic diagram of the structure of the analog circuit breaker provided by the embodiment of this application Figure 1 ;

[0042] Figure 3 It is a schematic diagram of the principle of the analog circuit breaker provided by the embodiment of this application;

[0043] Figure 4 It is a schematic diagram of the circuit structure of the interface unit provided by the embodiment of this application;

[0044] Figure 5 It is a schematic diagram of the circuit structure of the protection unit provided by the embodiment of this application;

[0045] Figure 6 It is a schematic diagram of the structure of the analog circuit breaker provided by the embodiment of this application Figure 2 ;

[0046] Figure 7 It is a schematic diagram of the structure of the operation panel of the analog circuit breaker provided by the embodiment of this application;

[0047] Figure 8 Schematic diagram of the internal operation of the terminal of Circuit A provided by the embodiment of the present application.

[0048] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and more detailed descriptions will be provided hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0049] Exemplary embodiments will be described in detail herein, and examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0050] In the related art, analog circuit breakers have attempted to solve the problems existing in high-voltage circuit breakers. For example, using an analog circuit breaker to test relay protection devices does not depend on the progress of infrastructure projects, and the test is not limited to being carried out by professionals in a specific environment, improving the flexibility and efficiency of the test work. However, the existing analog circuit breakers currently have deficiencies in terms of safety, which in turn affect the safety of the test and cannot meet the new requirements of modern power systems for relay protection testing.

[0051] To solve the above technical problems, the present application provides an analog circuit breaker. By providing an isolation unit in the analog circuit breaker, the interface unit and the processing unit are electrically isolated, ensuring the safety isolation between the high-voltage circuit connected to the interface unit and the low-voltage control circuit of the processing unit, and also preventing signal interference from high voltage to the low-voltage circuit, improving the safety, stability and accuracy of the analog circuit breaker, and further enhancing the safety and accuracy of the test.

[0052] The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0053] Figure 1 Schematic diagram of the application scenario of the analog circuit breaker provided by the embodiment of the present application. As Figure 1As shown in the figure, one side of the relay protection device 11 is connected to the trip input terminal and the closing input terminal of the analog circuit breaker 13, and the negative power terminal of the relay protection device 11 is connected to the common trip and closing terminal of the analog circuit breaker 13; the other side (current input terminal or voltage input terminal) of the relay protection device 11 is correspondingly connected to the current output terminal or voltage output terminal of the relay protection tester 12, and the trip position contact and the closing position contact of the analog circuit breaker 13 are connected to the digital input terminal of the relay protection tester 12. Among them, the relay protection tester 12 sends a fault signal (voltage or current) to the relay protection device 11, and the relay protection device 11 responds to receive the fault signal and sends a trip pulse signal or a closing pulse signal corresponding to the fault signal to the analog circuit breaker 13. The analog circuit breaker 13 outputs a corresponding trip and closing state signal to the relay protection tester 12 according to the received trip pulse signal or closing pulse signal. The relay protection tester 12 verifies whether the action logic of the relay protection device 11 is correct according to the obtained trip and closing state signals. For example, by monitoring the moment of the change of the contact state, it is judged whether the trip and closing actions are completed within the specified time.

[0054] The following combines Figure 1 application scenarios of Figure 2 to illustrate the analog circuit breaker provided by the embodiments of the present application. It should be noted that the above application scenarios are only shown for the convenience of understanding the spirit and principle of the present application, and the implementation manners of the present application are not limited by Figure 1 the application scenarios shown.

[0055] Figure 2 is a schematic structural diagram of the analog circuit breaker provided by the embodiments of the present application Figure 1 As Figure 2 shown, the analog circuit breaker provided in this embodiment includes: an isolation unit 21 and an interface unit 22 and a processing unit 23 electrically connected to the isolation unit 21; among them,

[0056] The processing unit 23 is configured to output a reference voltage to the isolation unit 21, and the reference voltage includes a trip reference voltage and a closing reference voltage.

[0057] Exemplarily, the reference voltage can be set through a digital-to-analog converter (DAC) built in the processing unit.

[0058] Optionally, the reference voltage supports modification. For example, the processing unit monitors the intensity of the pulse signal sent by the relay protection device connected to the analog circuit breaker, and automatically adjusts the DAC to output a reference voltage matching the intensity of the pulse signal; or, manually operates the control processing unit to set a reference voltage corresponding to the test requirements through the DAC. The reference voltage supports modification,

[0059] Compared with the related art where the reference voltage of the analog circuit breaker cannot be modified and cannot meet the simulation requirements of circuit breakers with different voltage levels and types, in the embodiments of the present application, the reference voltage supports modification, enabling the analog circuit breaker to adapt to the test requirements of a wide voltage range, flexibly simulating the tripping and closing operations of circuit breakers with different voltage levels, improving the applicability and flexibility of the analog circuit breaker, better meeting the diverse needs of the power system, and thus effectively improving the efficiency of relay protection testing.

[0060] The isolation unit 21 is used to isolate and transmit the reference voltage to the interface unit 22.

[0061] Exemplarily, the isolation unit may include a linear optocoupler, a transformer coupling, or a magnetic-coupled isolation amplifier, etc. Through electrical isolation, interference can be suppressed, the circuit can be protected, and the isolation transmission of the reference voltage can be realized, accurately and reliably transmitting the reference voltage to the interface unit.

[0062] In the use of the analog circuit breaker, there are high requirements for safety and accuracy. The isolation unit can be used to ensure the complete and reliable transmission of signals and provide a safety protection function.

[0063] The interface unit 22 is connected to the relay protection device and is used to receive the pulse signal sent by the relay protection device. The pulse signal is used to indicate tripping or closing; and when the voltage of the pulse signal is greater than or equal to the reference voltage corresponding to the pulse signal, a high-level signal is output; when the voltage of the pulse signal is less than the reference voltage corresponding to the pulse signal, a low-level signal is output.

[0064] The analog circuit breaker is connected to the relay protection device through the interface unit. The interface unit receives the tripping pulse signal or closing pulse signal sent by the relay protection device. Exemplarily, the tripping pulse signal is a 220V voltage pulse signal with a duration of 100ms, and the closing signal is a 220V voltage pulse signal with a duration of 50ms.

[0065] The interface unit judges the magnitudes of the received pulse signal and the reference voltage, and determines the corresponding output signal according to the magnitude relationship. Specifically, judge the magnitude relationship between the voltage of the received tripping pulse signal and the tripping reference voltage. If the voltage of the tripping pulse signal is greater than or equal to the tripping reference voltage, a high-level signal corresponding to the tripping pulse signal is output; otherwise, a low-level signal corresponding to the tripping pulse signal is output. Judge the magnitude relationship between the voltage of the received closing pulse signal and the closing reference voltage. If the voltage of the closing pulse signal is greater than or equal to the closing reference voltage, a high-level signal corresponding to the closing pulse signal is output; otherwise, a low-level signal corresponding to the closing pulse signal is output.

[0066] Optionally, the interface unit can also automatically identify whether the received pulse signal is a trip pulse signal or a closing pulse signal according to the characteristics of the pulse signal. For example, the relay protection device may send pulse signals of different widths to distinguish between trip and closing commands. Trip may be a high-level pulse of 100 ms, while closing may be a pulse of 50 ms. Or different numbers and frequencies of pulses are used to encode different operations. The corresponding recognition and judgment logic can be preset in the interface unit to identify the trip pulse signal and the closing pulse signal, and then compare their magnitudes with the corresponding reference voltages to output the level signal of the trip pulse or the level signal of the closing pulse signal.

[0067] Optionally, the interface unit may further include multiple detection circuits. For example, for the requirement scenario where the relay protection device is a three-phase (U\V\W) system, in order to adapt to the test of this scenario, the interface unit can be provided with 6 detection circuits, which are respectively connected to the trip pulse signal output terminals and the closing pulse signal output terminals of different phases of the relay protection device. Each detection circuit corresponds to a reference voltage, and thus the level signals of the trip pulse signals and the closing pulse signals for different phases can be directly output.

[0068] The isolation unit 21 is also used to isolate and transmit the high-level signal or the low-level signal to the processing unit 23.

[0069] Exemplarily, the isolation unit can isolate and transmit the high-level signal or the low-level signal output by the interface unit to the processing unit through methods such as opto-isolation, magnetic isolation, capacitive isolation, or magnetic coupling isolation.

[0070] The analog circuit breaker receives the high-voltage pulse signal sent from the side of the power-off protection device through the interface unit. It can be regarded that the interface unit is externally connected to the high-voltage main circuit loop, the processing unit is a low-voltage control circuit, and the isolation unit is respectively connected to the processing unit and the interface unit. The isolation unit is used to electrically isolate the interface unit and the processing unit. It can be understood that the isolation unit effectively isolates the high-voltage main circuit loop and the low-voltage control circuit. On the one hand, it blocks the potential difference and prevents high-voltage impact. The isolation voltage is not less than 1500 V, effectively protecting the electronic components from damage to the analog circuit breaker. On the other hand, it suppresses the signal interference of the high voltage on the low-voltage circuit, especially the differential-mode interference, and eliminates the differential-mode interference voltage generated by the ground loop current caused by the ground potential difference of different devices (analog circuit breaker and relay protection device), and transmits the high-level signal or the low-level signal output by the interface unit to the processing unit completely and accurately.

[0071] The processing unit 23 is also used to control the trip and closing relays in the analog circuit breaker to perform the operations corresponding to the pulse signal when detecting that the input is a high-level signal, so as to output the trip and closing state signals corresponding to the pulse signal.

[0072] Exemplarily, for the sake of understanding, see the following textFigure 7 , taking the U phase as an example, when the processing unit detects a high-level signal inputted as the U-phase trip pulse signal, the tripping and closing relay on the tripping circuit A corresponding to U in the simulated circuit breaker is controlled to be disconnected (tripping input terminal A and tripping and closing common terminal COM are disconnected), and at the same time, the tripping and closing relay on the closing circuit A corresponding to U is closed (closing input terminal A and tripping and closing common terminal COM are connected); thereby causing the tripping and closing relay on the tripping position circuit A corresponding to U to be closed (tripping position contact A and tripping and closing common position contact COMA are connected), and the tripping and closing relay on the closing position circuit A corresponding to U to be disconnected (closing position contact A and tripping and closing common position contact COMA are disconnected), and outputs a state signal that the simulated circuit breaker is currently in a trip state to an external device (such as a relay protection tester). If a low-level signal inputted as the U-phase trip pulse signal is detected, it indicates that the tripping instruction is not detected, and the corresponding tripping operation is not triggered.

[0073] Similarly, when a high-level signal of the U-phase closing pulse signal is detected as the input, the tripping and closing relay on the closing circuit A corresponding to U in the simulated circuit breaker is controlled to be disconnected (the closing input terminal A and the tripping and closing common terminal COM are disconnected), and at the same time, the tripping and closing relay on the tripping circuit A corresponding to U is closed (the tripping input terminal A and the tripping and closing common terminal COM are connected); this causes the tripping and closing relay on the closing circuit A corresponding to U to be closed (the closing position contact A and the tripping and closing common position contact COMA are connected), and the tripping and closing relay on the tripping circuit A corresponding to U to be disconnected (the tripping position contact A and the tripping and closing common position contact COMA are disconnected), outputting a signal to the external device (such as a relay protection tester) that the simulated circuit breaker is currently in a closed state.

[0074] In summary, through Figure 3 A brief description of the principle of the simulated circuit breaker is given. Figure 3 The schematic diagram of the principle of the simulated circuit breaker provided in the embodiment of the present application. Figure 3 As shown, the processing unit (also regarded as a microcontroller unit (MCU)) outputs a reference voltage (such as the tripping / closing reference voltage in the figure) through a DAC, and the reference voltage is used to compare with the tripping pulse signal and the closing pulse signal received through the interface unit. The isolation unit is not shown in the figure, and the interface unit outputs the comparison result in the form of high and low level signals. The MCU controls the tripping and closing relays to perform the operations corresponding to the tripping / closing pulse signals according to the comparison result.

[0075] It should be noted that the embodiment of the present application does not limit the specific structure of the isolation unit, and a suitable isolation method can be selected according to the test requirements of the relay protection device.

[0076] In the embodiment of the present application, by setting an isolation unit, the interface unit and the processing unit are electrically isolated, ensuring the safety isolation between the high-voltage main circuit loop connected to the interface unit and the low-voltage control circuit of the processing unit, blocking the potential difference, achieving safety protection, reducing the damage risk of the potential difference to the components of the analog circuit breaker, reducing the probability of potential failures, and extending the service life of the analog circuit breaker; in addition, through electrical isolation, the signal interference of high voltage on the low-voltage circuit is suppressed, the signal integrity is improved, thereby improving the safety, stability and accuracy of the analog circuit breaker, and further improving the safety and accuracy of the test.

[0077] Optionally, the processing unit serves as the control center of the analog circuit breaker, and its performance is crucial for the entire analog circuit breaker. In practical applications, the processing unit can adopt a high-performance ARM chip, not limited to the AT32F403A series of chips. The ARM chip has the advantages of flexible programming, fast interrupt response and multi-channel DAC output. In addition, this type of chip usually has low latency and power consumption, and can also provide high-speed computing capabilities and rich communication interfaces, such as USART, etc. Therefore, it is suitable for analog circuit breakers. A digital-to-analog converter (DAC) module is built into the processing unit, with rich pins, low power consumption, fast operating speed and strong anti-interference ability, so as to realize an analog circuit breaker with low power consumption and high response speed, and improve the test efficiency.

[0078] In some embodiments, the isolation unit includes a linear optocoupler and a digital optocoupler, where: the input end of the linear optocoupler serves as the first input end of the isolation unit and is used to connect to the processing unit; the output end of the linear optocoupler serves as the first output end of the isolation unit and is used to connect to the interface unit; the input end of the digital optocoupler serves as the second input end of the isolation unit and is used to connect to the interface unit, and the output end of the digital optocoupler serves as the second output end of the isolation unit and is used to connect to the processing unit.

[0079] Among them, the linear optocoupler (such as model HCNR201) can linearly change the output of the photosensitive element by adjusting the current of the LED, so as to effectively transmit analog signals and reduce the influence of external interference on the processing unit. The reference voltage output by the processing unit is an analog quantity (such as 0-3.3V). Therefore, the reference voltage can be isolated and transmitted through the linear optocoupler to ensure the accurate and reliable transmission of the reference voltage.

[0080] The digital optocoupler belongs to an ordinary optocoupler and is usually used to transmit switch signals. Electrical isolation of high-speed switch signals is achieved through optoelectronic devices. The output signal of the digital optocoupler is a switch quantity 1 or 0, and the interface unit outputs high and low level signals, that is, switch quantities. Therefore, the high and low level signals can be isolated and transmitted through the digital optocoupler to ensure the accurate and reliable transmission of the high and low level signals.

[0081] In some embodiments, the interface unit includes a first detection circuit and a second detection circuit. The first detection circuit is used to connect to the tripping pulse signal output terminal of the relay protection device, and the second detection circuit is used to connect to the closing pulse signal output terminal of the relay protection device.

[0082] Among them, the tripping pulse signal output terminal of the relay protection device is used to output a tripping pulse signal, and the closing pulse signal output terminal of the relay protection device is used to output a closing pulse signal.

[0083] The first detection circuit is used to receive a pulse signal for indicating tripping, and when the voltage of the pulse signal is greater than or equal to the tripping reference voltage, it outputs a high-level signal; when the voltage of the pulse signal is less than the tripping reference voltage, it outputs a low-level signal;

[0084] The second detection circuit is used to receive a pulse signal for indicating closing, and when the voltage of the pulse signal is greater than or equal to the closing reference voltage, it outputs a high-level signal; when the voltage of the pulse signal is less than the closing reference voltage, it outputs a low-level signal.

[0085] It should be noted that for the requirement scenario where the relay protection device is a three-phase (U / V / W) system, in order to adapt to the test of this scenario, the interface unit should include three first detection circuits with the same circuit structure, which are respectively used to receive the tripping pulse signals of the U phase, V phase, and W phase of the relay protection device; and three second detection circuits with the same circuit structure, which are respectively used to receive the closing pulse signals of the U phase, V phase, and W phase of the relay protection device.

[0086] Further, Figure 4 the internal structure of the interface unit will be described. Figure 4 FIG. is a schematic circuit diagram of the interface unit provided by the embodiment of the present application.

[0087] Referring to Figure 4 , the first detection circuit 41 includes a first comparator U1, a first resistor R1, and a second resistor R2, and the second detection circuit 42 includes a second comparator U2, a third resistor R3, and a fourth resistor R4; where:

[0088] The first end of the first resistor R1 is used to connect to the tripping pulse signal output terminal. The second end of the first resistor R1 and the first end of the second resistor R2 are connected to form a common connection end, and the common connection end is also connected to the positive input terminal of the first comparator U1. The second end of the second resistor R2 is grounded; the output terminal of the first comparator U1 is connected to the second input terminal of the isolation unit; the negative input terminal of the first comparator U1 is connected to the first output terminal of the isolation unit;

[0089] The first end of the third resistor R3 is used to connect to the closing pulse signal output terminal. The second end of the third resistor R3 and the first end of the fourth resistor R4 are connected to form a common connection terminal, and the common connection terminal is also connected to the positive input terminal of the second comparator U2. The second end of the fourth resistor R4 is grounded. The output terminal of the second comparator U2 is connected to the second input terminal of the isolation unit. The negative input terminal of the second comparator U2 is connected to the first output terminal of the isolation unit.

[0090] Among them, the first resistor R1 and the second resistor R2 are connected in series to divide the voltage of the incoming tripping pulse signal, so that the voltage of the tripping pulse signal input to the positive input terminal of the first comparator U1 is in the range of 0 - 3.3V, and then compared with the tripping reference voltage at the negative input terminal. If the voltage of the tripping pulse signal is greater than the tripping reference voltage, the first comparator U1 outputs a high-level signal; otherwise, it outputs a low-level signal.

[0091] The third resistor R3 and the fourth resistor R4 are connected in series to divide the voltage of the incoming closing pulse signal, so that the voltage of the closing pulse signal input to the positive input terminal of the second comparator U2 is in the range of 0 - 3.3V, and then compared with the closing reference voltage at the negative input terminal. If the voltage of the closing pulse signal is greater than the closing reference voltage, the second comparator U2 outputs a high-level signal; otherwise, it outputs a low-level signal.

[0092] Like all power test devices, the analog circuit breaker may also encounter abnormal working conditions during operation. In particular, if a fault occurs and the analog circuit breaker fails to disconnect the current from the relay protection device in time, a current of up to 5A may pass through the analog circuit breaker for a long time. This will not only damage the analog circuit breaker itself, but may also cause damage to the tested relay protection device. Since the current passing through the circuit for controlling the analog circuit breaker by the relay protection device is generally high-power DC, such as DC220V, 5A with a 1.1kW high-power DC, it is easy to cause the components inside the analog circuit breaker to heat up rapidly, and it is difficult to cut off the power supply of the energized circuit. In the case of the malfunction of the analog circuit breaker, not only will the relevant components of itself be burned out, but the relay protection device may also be burned out.

[0093] To avoid the above problems, in some embodiments, the analog circuit breaker further includes a protection unit electrically connected to the processing unit. Correspondingly, the processing unit is further configured to:

[0094] Monitor the input duration of the pulse signal; when the input duration is greater than or equal to the duration threshold, trigger the protection unit to cut off the test circuit corresponding to the pulse signal, and the test circuit includes a tripping circuit and a closing circuit; and generate a fault indication message to prompt relevant personnel to perform fault handling.

[0095] Exemplarily, when the processing unit detects the level signal (high level or low level) corresponding to the pulse signal transmitted by the isolation unit, it means that there may be a trip pulse signal or a closing pulse signal accessing the analog circuit breaker at this time. That is, at this time, the analog circuit breaker and the relay protection device form a test loop corresponding to the pulse signal. At this time, the processing unit monitors the input duration of the pulse signal and compares it with a preset duration threshold. In one implementation, the duration threshold can be implemented in the form of a software timer. When the processing unit detects the level signal, the timer is started. If the pulse signal has not been interrupted after exceeding the set time of the timer, that is, the test loop has not been disconnected, the processing unit outputs a protection signal to the protection unit to trigger the protection unit to cut off the test loop corresponding to the pulse signal. For example, when the processing unit detects the high-level signal of the trip pulse signal transmitted by the isolation unit, it indicates that the analog circuit breaker will perform a trip operation at this time, the trip loop is connected, and the software timer is started. If the trip loop has not been disconnected within the set time of the timer, it indicates that the analog circuit breaker is abnormal, and the protection unit is triggered to cut off the trip loop, forcing the current between the analog circuit breaker and the relay protection device to be disconnected to protect the analog circuit breaker and the relay protection device from damage. Moreover, the processing unit also provides fault indication information to ensure that the operator can timely understand the equipment status and take corresponding measures.

[0096] In the embodiment of the present application, by monitoring the input duration of the pulse signal by the processing unit and automatically triggering the protection unit to cut off the test loop when an abnormal situation is recognized based on the input duration, the current connection with the tested relay protection device is disconnected, preventing equipment damage, ensuring the safety of the test process, and providing additional safety protection for the operator.

[0097] Furthermore, Figure 5 is a schematic circuit diagram of the protection unit provided by the embodiment of the present application. As Figure 5 shown, in some embodiments, the protection unit includes a relay K1, a switching transistor Q1, a fifth resistor R5, a sixth resistor R6, a diode D1, and a capacitor C1; wherein:

[0098] The first end of the fifth resistor R5 is commonly connected to the base of the switching transistor Q1 to form a common connection end, and the common connection end serves as the connection end between the protection unit and the processing unit; the second end of the fifth resistor R5, the emitter of the switching transistor Q1, and the first end of the capacitor C1 are commonly connected and then grounded; the collector of the switching transistor Q1, the first end of the relay K1, and the anode of the diode D1 are commonly connected; the second end of the relay K1, the cathode of the diode D1, the second end of the capacitor C1, and the first end of the sixth resistor R6 are commonly connected; the second end of the sixth resistor R6 serves as the power input terminal of the protection unit; the relay K1 is used to control the disconnection of the test loop corresponding to the pulse signal.

[0099] For example, the power input terminal of the protection unit is marked as VCC in the figure. When the processing unit detects that the input duration of the pulse signal is greater than or equal to the duration threshold, a protection signal is output to the protection unit. The protection signal is at a high level (such as Figure 5 The voltage is transmitted to the common terminal formed by the first end of the fifth resistor R5 and the base of the switch tube Q1 in the form of a medium signal input. At this time, the collector and emitter of the switch tube Q1 are turned on, and the current flows from VCC to the relay K1. The coil of the relay K1 is energized, so that the normally closed contact of the relay K1 is disconnected, and the DC negative power supply of the test circuit is cut off, that is, the test circuit is disconnected.

[0100] In some embodiments, the processing unit is further used to: detect a reset signal for the fault indication information, triggering the protection unit to connect the test circuit corresponding to the pulse signal; correspondingly, the relay is also used to: control the connection of the test circuit corresponding to the pulse signal.

[0101] For example, when the processing unit triggers the protection unit to cut off the test circuit corresponding to the pulse signal, it also generates fault indication information to prompt relevant personnel to handle the fault. After the tester finds the fault indication information, he immediately stops the test and checks the simulated circuit breaker. After the fault is eliminated, for example, by acting on the reset button on the simulated circuit breaker, a reset signal is generated. The reset signal is at a low level (such as Figure 5 The signal is transmitted in the form of a signal input) to the common terminal formed by the first end of the fifth resistor R5 and the base of the switch tube Q1. At this time, the switch tube Q1 is not conducting, and the coil of the relay K1 loses power, which causes the contacts of the relay K1 to close and connect the DC negative power supply of the test circuit, that is, connect the test circuit, realize the reset of the protection circuit, and continue the test.

[0102] In some embodiments, the simulated circuit breaker also includes a communication unit electrically connected to the processing unit; the communication unit integrates a wireless communication module, and the wireless communication module is used to establish a data connection with the remote management platform; accordingly, the processing unit is also used to: receive remote control instructions issued by the remote management platform to control and manage the simulated circuit breaker, the remote control instructions include at least one of parameter configuration, status query and firmware upgrade, and the parameter configuration includes reference voltage configuration.

[0103] For example, the wireless communication module can support WI-FI communication and / or SIM card communication. The simulated circuit breaker interacts with a remote management platform, such as a cloud platform, through the wireless communication function provided by the communication unit.

[0104] Correspondingly, for example, when a user logs in to the remote management platform, accesses the simulated circuit breaker through a wireless network, and manages or upgrades the simulated circuit breaker, the user can configure parameters, query the status, and upgrade the firmware of the simulated circuit breaker through the remote management platform. Among them, parameter configuration includes basic electrical parameter configuration, protection function parameter configuration, time parameter configuration, mechanical parameter configuration, etc., and also includes reference voltage configuration. The output of the DAC in the processing unit can be controlled through a remote control instruction. Status query includes working status query, protection action status, fault status query, upgrade status query, etc.

[0105] In the embodiment of the present application, through the wireless communication capability provided by the communication unit, the intelligent management of the simulated circuit breaker is realized, which improves the convenience, flexibility of operation and the modernization level of the device, and improves the user experience.

[0106] In some embodiments, the simulated circuit breaker further includes a display unit electrically connected to the processing unit; the display unit is configured to receive the display information sent by the processing unit and visually output the display information, and the display information includes the opening and closing time, working status, voltage, current, and fault indication information of the simulated circuit breaker.

[0107] Exemplarily, after the simulated circuit breaker executes a tripping operation, the processing unit sends the corresponding tripping time, current value, and voltage value at the time of tripping to the display unit; when it is detected that the simulated circuit breaker has a fault abnormality and the protection unit automatically cuts off the test circuit, the fault abnormality information will be sent to the display unit to remind relevant personnel to conduct fault troubleshooting; during the test of the simulated circuit breaker, the working status (tripping, closing, self-checking, etc.) of the simulated circuit breaker is transmitted to the display unit in real time. The display unit can visually display the display information in the form of a serial port display screen, a parallel interface display screen, a USB display, or a touch screen display.

[0108] In the embodiment of the present application, through the deep integration of the display unit and the processing unit, the simulated circuit breaker can achieve state transparency, intuitive operation, and fault traceability, improve the test efficiency, help relevant personnel monitor the status and performance of the simulated circuit breaker in real time, and identify and handle faults in a timely manner.

[0109] Further, in some embodiments, the display unit includes: a serial port display screen, and the serial port display screen is configured to visually display the display information on the serial port display screen based on a serial communication protocol.

[0110] Among them, the serial communication protocol is not limited to including protocols such as Universal Asynchronous Receiver-Transmitter (UART) protocol, Serial Peripheral Interface (SPI) protocol, I2C protocol, Modbus protocol, or RS-485 protocol, etc.

[0111] To improve the user experience, the serial port display screen uses a high-resolution display screen.

[0112] Exemplarily, after a closing operation, the serial port display screen clearly shows data such as the closing time of 0.5 seconds and the closing voltage of DC220V, facilitating testers to make subsequent adjustments and analyses based on this information.

[0113] In the embodiments of the present application, through the high-resolution serial port display screen, the working status, trip and closing times, voltage, and current information of the analog circuit breaker are displayed in real time, facilitating operators to monitor and adjust, thereby improving the accuracy and efficiency of the test.

[0114] Considering the limitations of the test site, there may be a situation without an external power supply. In some embodiments, the analog circuit breaker further includes a power supply unit, and the power supply unit is used to provide a lithium power supply for the interface unit, isolation unit, processing unit, communication unit, display unit, and protection unit.

[0115] Exemplarily, the power supply unit can adopt a large-capacity lithium battery to provide continuous power support for the analog circuit breaker for more than 12 hours, enabling the test work to proceed smoothly.

[0116] In the embodiments of the present application, a lithium battery is used as the power supply unit to supply power to the analog circuit breaker, ensuring that the analog circuit breaker can operate stably for a long time without an external power supply, adapting to various on-site test requirements, and enhancing the practicability, reliability, and portability of the device.

[0117] In summary, through Figure 6 the structure of the analog circuit breaker is further described.

[0118] Figure 6 This is the structural schematic diagram of the analog circuit breaker provided by the embodiments of the present application Figure 2 . As Figure 6 shown, the analog circuit breaker provided by the embodiments of the present application includes: an isolation unit 21, an interface unit 22, a processing unit 23, a communication unit 24, a power supply unit 25, a display unit 26, and a protection unit 27, where:

[0119] The interface unit 22 is used to make a seamless connection with the relay protection device, receive the pulse signal for indicating tripping or closing sent by the relay protection device, and judge the magnitudes of the pulse signal and the reference voltage, and determine the corresponding level output signal according to the magnitude relationship.

[0120] The isolation unit 21 is used to electrically isolate the interface unit and the processing unit, ensure the safety isolation between the high-voltage circuit and the digital circuit, the isolation voltage is not less than 1500V, effectively prevent the interference of high voltage to the low-voltage circuit, ensure the safety and stability of the analog circuit breaker, and reduce the potential failure risk.

[0121] The processing unit 23 uses a high-performance ARM chip, supports flexible programming, fast interrupt response and multi-channel DAC output. The processing unit 23 is responsible for efficiently processing the tripping and closing signals and real-time monitoring the status of the analog circuit breaker to ensure that the analog circuit breaker can respond quickly and accurately to external control signals. In addition, the reference voltage in the processing unit supports flexible modification, enabling the analog circuit breaker to flexibly simulate the tripping and closing operations of circuit breakers with different voltage levels, with stronger functionality, adapting to the test requirements of a wide voltage range, and providing diversified test solutions.

[0122] The communication unit 24 is built-in with a wireless communication module, enabling the analog circuit breaker to support remote control and program upgrade, allowing relevant personnel to conveniently manage and maintain the device through a wireless network, improving the operation flexibility and modernization level of the device.

[0123] The power supply unit 25 uses a large-capacity lithium power supply to ensure that the device can still operate stably without an external power supply, adapt to various on-site test requirements, and enhance the practicability, reliability and portability of the device.

[0124] The display unit 26 uses a high-resolution serial display screen to realize parameter and status monitoring, and can display the working status, tripping and closing time, and voltage and current information of the analog circuit breaker in real time, facilitating the operator to monitor and adjust, and improving the accuracy and efficiency of the test.

[0125] When the protection unit 27 receives the protection signal sent by the processing unit, it automatically cuts off the test circuit to disconnect the connection with the relay protection device, prevent equipment damage, ensure the safety of the test process, and provide additional safety protection for the operator.

[0126] Through the coordinated work of each unit, they jointly form a modular integrated analog circuit breaker, which not only improves the efficiency of the test work, reduces the operation risk, but also meets the requirements of modern power systems for the portability, low power consumption, multi-functionality and intelligent control of equipment.

[0127] In some embodiments, the analog circuit breaker further includes: an operation panel, on which there is an interface unit for connecting to the terminals of the relay protection device. The terminals include a trip input terminal, a closing input terminal, a common trip / closing terminal, a trip position contact, a closing position contact, and a common trip / closing position contact. The trip input terminal, the closing input terminal, and the common trip / closing terminal are used to connect to the relay protection device to obtain the pulse signals sent by the relay protection device.

[0128] Figure 7 FIG. is a schematic structural diagram of the operation panel of the analog circuit breaker provided by the embodiment of the present application. Taking the relay protection device as a three-phase system as an example, as Figure 7 shown, the operation panel of the analog circuit breaker includes: an A-phase trip input terminal (Trip A), an A-phase closing input terminal (Close A), and an A-phase common trip / closing terminal (COM) connected to the U phase of the relay protection device; a B-phase trip input terminal (Trip B), a B-phase closing input terminal (Close B), and a B-phase common trip / closing terminal (COM) connected to the V phase of the relay protection device; a C-phase trip input terminal (Trip C), a C-phase closing input terminal (Close C), and a C-phase common trip / closing terminal (COM) connected to the W phase of the relay protection device. It also includes: an A-phase trip position contact (Trip Position A), an A-phase closing position contact (Close Position A), and an A-phase common trip / closing position contact (COMA) connected to the relay protection tester; a B-phase trip position contact (Trip Position B), a B-phase closing position contact (Close Position B), and a B-phase common trip / closing position contact (COMB); a C-phase trip position contact (Trip Position C), a C-phase closing position contact (Close Position C), and a C-phase common trip / closing position contact (COMC).

[0129] The trip input terminal, the closing input terminal, and the common trip / closing terminal are used to connect to the relay protection device to obtain the pulse signals sent by the relay protection device. The trip position contact, the closing position contact, and the common trip / closing position contact are used to connect to the relay protection tester to output the trip / closing state signals corresponding to the pulse signals to the relay protection tester.

[0130] In some embodiments, the operation panel further includes: a manual trip control and a manual closing control. The manual trip control is used to generate a trip pulse signal, and the manual closing control is used to generate a closing pulse signal.

[0131] See Figure 7 shown, the operation panel includes a manual trip control and a manual closing control, and the controls are set in the form of buttons.

[0132] The manual trip control and manual closing control are used to simulate the circuit breaker self-test. For example, when the relay protection device is not connected, if you want to verify whether the simulated circuit breaker is normal, the relevant personnel can generate a trip pulse signal by acting on the manual trip button to verify whether the tripping behavior of the simulated circuit breaker is normal; and generate a closing pulse signal by acting on the manual closing button to verify whether the closing behavior of the simulated circuit breaker is normal.

[0133] Compared with the related art that can only connect to the relay protection device and send tripping and closing pulse signals through the relay protection device to troubleshoot the simulated circuit breaker, the embodiment of the present application sets a manual tripping space and a manual closing control, and performs simulated circuit breaker self-inspection through the manual tripping control and the manual closing control, which is more flexible and convenient.

[0134] In some embodiments, the operation panel also includes: a tripping indicator light and a closing indicator light; correspondingly, the processing unit is also used to control the tripping and closing indicator lights according to the tripping and closing status signals.

[0135] See also Figure 7 As shown, the manual trip button integrates a trip indicator light, and the manual close button integrates a close indicator light. For example, each button is equipped with a green or red indicator light, and the manual close button integrates a red light (such as Figure 7 Medium dark gray area), the hand jump button integrates a green light (such as Figure 7 The color changes of these indicators visually show the current status of the simulated circuit breaker, that is, tripped (green light) or closed (red light).

[0136] By controlling the trip / close indicator light, the current working status of the simulated circuit breaker can be displayed intuitively, providing a better user experience.

[0137] Next, combine Figure 8 Explain the internal actions corresponding to each terminal of A circuit. Figure 8 This is a schematic diagram of the internal operation of the A-way terminal provided in an embodiment of the present application.

[0138] It should be noted that because the switches on each route are single-pole double-throw relays (such as Figure 8 As shown in (b) in the figure, the conduction of jump A terminal and the conduction of close A terminal are mutually exclusive. Similarly, the relationship between close position A and jump position A is the same.

[0139] Take Road A as an example. Figure 8 As shown in (a), the tripping A, closing A and COM of the simulated circuit breaker are connected to the terminals on the relay protection device, and the tripping position A, closing position A and COMA are connected to the terminals on the relay protection tester. The conduction between tripping A and COM forms a tripping circuit, and the conduction between closing A and COM forms a closing circuit.

[0140] When the simulated circuit breaker detects a trip pulse signal sent by an external relay protection device or a trip pulse signal generated by triggering the manual trip button:

[0141] The common negative power supply (COM terminal) of the trip A terminal and the trip and closing circuit is disconnected, and at the same time, the close A terminal and the COM terminal are conducted. This causes the trip position A terminal and the common end (COMA terminal) of the A circuit trip and close position circuit to be connected, while the close position A terminal and the COMA terminal are disconnected. At this time, the green indicator light on the manual trip A button lights up, and the red indicator light on the manual close A button goes out, clearly indicating that the circuit breaker is in the tripped state.

[0142] On the contrary, if an A circuit closing signal is detected or the closing button is pressed, the close A terminal and the COM terminal will be disconnected, and the trip A terminal and the COM terminal will be conducted, so that the close position A terminal and the COMA terminal are connected, while the trip position A terminal and the COMA terminal are disconnected. At this time, the red indicator light on the manual close A button lights up, and the green indicator light on the manual trip A button goes out, indicating that the circuit breaker has been switched to the closed state.

[0143] That is: Trip A and COM are disconnected: The trip is completed, the trip circuit is cut off, and the trip operation stops. Close A and COM are connected: The closing circuit is connected, and the closing operation is prepared. Trip position A and COMA are connected: The trip position interface is closed, and the simulated circuit breaker is in the tripped state is fed back to an external device (such as a relay protection tester). Close position A and COMA are disconnected: The closing position contact is disconnected, and the feedback of the closing state stops.

[0144] Finally, it should be noted that: After considering the specification and practicing the invention disclosed herein, those skilled in the art will easily think of other embodiments of the present invention. The present invention aims to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention, and is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A simulated circuit breaker, characterized in that, Comprising: An isolation unit, an interface unit and a processing unit electrically connected to the isolation unit; wherein, The processing unit is configured to output a reference voltage to the isolation unit, the reference voltage including a tripping reference voltage and a closing reference voltage; The isolation unit is configured to isolate and transmit the reference voltage to the interface unit; The interface unit is connected to a relay protection device and is configured to receive a pulse signal sent by the relay protection device, the pulse signal being used to indicate tripping or closing; and output a high-level signal when the voltage of the pulse signal is greater than or equal to the reference voltage corresponding to the pulse signal; output a low-level signal when the voltage of the pulse signal is less than the reference voltage corresponding to the pulse signal; The isolation unit is further configured to isolate and transmit the high-level signal or the low-level signal to the processing unit; The processing unit is further configured to, when detecting that the input is a high-level signal, control the trip and close relay in the analog circuit breaker to perform the operation corresponding to the pulse signal, so as to output a trip and close state signal corresponding to the pulse signal.

2. The analog circuit breaker according to claim 1, characterized in that, The isolation unit includes a linear optocoupler and a digital optocoupler, wherein: The input end of the linear optocoupler serves as the first input end of the isolation unit and is used to connect to the processing unit; the output end of the linear optocoupler serves as the first output end of the isolation unit and is used to connect to the interface unit; The input end of the digital optocoupler serves as the second input end of the isolation unit and is used to connect to the interface unit, and the output end of the digital optocoupler serves as the second output end of the isolation unit and is used to connect to the processing unit.

3. The analog circuit breaker according to claim 1 or 2, characterized in that, The interface unit includes a first detection circuit and a second detection circuit. The first detection circuit is used to connect to the tripping pulse signal output end of the relay protection device, and the second detection circuit is used to connect to the closing pulse signal output end of the relay protection device; The first detection circuit is configured to receive a pulse signal for indicating tripping, and output a high-level signal when the voltage of the pulse signal is greater than or equal to the tripping reference voltage; output a low-level signal when the voltage of the pulse signal is less than the tripping reference voltage; The second detection circuit is configured to receive a pulse signal for indicating closing, and output a high-level signal when the voltage of the pulse signal is greater than or equal to the closing reference voltage; output a low-level signal when the voltage of the pulse signal is less than the closing reference voltage.

4. The analog circuit breaker according to claim 3, characterized in that, The first detection circuit includes a first comparator, a first resistor and a second resistor, and the second detection circuit includes a second comparator, a third resistor and a fourth resistor; wherein: The first end of the first resistor is used to connect to the tripping pulse signal output end. The second end of the first resistor and the first end of the second resistor are connected to form a common connection end, and the common connection end is also connected to the positive input end of the first comparator. The second end of the second resistor is grounded. The output end of the first comparator is connected to the second input end of the isolation unit. The negative input end of the first comparator is connected to the first output end of the isolation unit; The first end of the third resistor is used to connect to the closing pulse signal output terminal. The second end of the third resistor and the first end of the fourth resistor are connected to form a common connection terminal, and the common connection terminal is also connected to the positive input terminal of the second comparator. The second end of the fourth resistor is grounded. The output terminal of the second comparator is connected to the second input terminal of the isolation unit. The negative input terminal of the second comparator is connected to the first output terminal of the isolation unit.

5. The analog circuit breaker according to claim 1 or 2, characterized in that The analog circuit breaker further includes a protection unit electrically connected to the processing unit. Correspondingly, the processing unit is further configured to: Monitor the input duration of the pulse signal. When the input duration is greater than or equal to the duration threshold, trigger the protection unit to cut off the test circuit corresponding to the pulse signal. The test circuit includes a tripping circuit and a closing circuit. And generate a fault indication message to prompt relevant personnel to perform fault handling.

6. The analog circuit breaker according to claim 5, characterized in that, The protection unit includes a relay, a switching tube, a fifth resistor, a sixth resistor, a diode, and a capacitor. Among them: The first end of the fifth resistor is commonly connected to the base of the switching tube to form a common connection terminal, and the common connection terminal serves as the connection terminal between the protection unit and the processing unit. The second end of the fifth resistor, the emitter of the switching tube, and the first end of the capacitor are commonly connected and then grounded. The collector of the switching tube, the first end of the relay, and the anode of the diode are commonly connected. The second end of the relay, the cathode of the diode, the second end of the capacitor, and the first end of the sixth resistor are commonly connected. The second end of the sixth resistor serves as the power input terminal of the protection unit. The relay is used to control the disconnection of the test circuit corresponding to the pulse signal.

7. The analog circuit breaker according to claim 6, wherein The processing unit is further configured to: When detecting a reset signal for the fault indication message, trigger the protection unit to connect the test circuit corresponding to the pulse signal. Correspondingly, the relay is further used to: control the connection of the test circuit corresponding to the pulse signal.

8. The analog circuit breaker according to claim 5, wherein The analog circuit breaker further includes a communication unit electrically connected to the processing unit. The communication unit integrates a wireless communication module, and the wireless communication module is used to establish a data connection with a remote management platform. Correspondingly, the processing unit is further configured to: receive a remote control instruction sent by the remote management platform to control and manage the analog circuit breaker. The remote control instruction includes at least one of parameter configuration, status query, and firmware upgrade. The parameter configuration includes reference voltage configuration.

9. The analog circuit breaker according to claim 8, characterized in that The analog circuit breaker further includes a display unit electrically connected to the processing unit. The display unit is configured to receive the display information sent by the processing unit and visually output the display information. The display information includes the opening and closing times, working status, voltage, current, and the fault indication message of the analog circuit breaker.

10. The analog circuit breaker according to claim 9, wherein, The display unit includes: a serial port display screen, and the serial port display screen is configured to visually display the display information on the serial port display screen based on a serial communication protocol.

11. The analog circuit breaker according to claim 10, wherein The simulated circuit breaker further includes: a power supply unit; the power supply unit is used to provide a lithium power supply for the interface unit, the isolation unit, the processing unit, the communication unit, the display unit and the protection unit.

12. The analog circuit breaker according to claim 1 or 2, characterized in that The simulated circuit breaker further includes: an operation panel, and the interface unit for connecting the relay protection device is included on the operation panel. The terminals include a trip input terminal, a closing input terminal, a trip / closing common terminal, a trip position contact, a closing position contact and a trip / closing common position contact. The trip input terminal, the closing input terminal and the trip / closing common terminal are used to connect to the relay protection device to obtain the pulse signals sent by the relay protection device.

13. The analog circuit breaker according to claim 12, wherein The operation panel further includes: a manual trip control and a manual closing control. The manual trip control is used to generate a trip pulse signal, and the manual closing control is used to generate a closing pulse signal.

14. The analog circuit breaker according to claim 13, wherein, The operation panel further includes: a trip indicator light and a closing indicator light; correspondingly, the processing unit is further used to control the trip indicator light and the closing indicator light according to the trip / closing state signal.

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