Power distribution terminal opening and closing control loop detection device and method

Abstract

The invention provides a power distribution terminal opening and closing control loop detection device and method, and relates to the technical field of electric power, and the device comprises a detection unit which comprises an opening and closing loop detection module and an opening and closing pressing plate state detection module; the MCU is used for sending a pulse test signal to the detection unit and receiving a group of feedback signals input by the detection unit; the closing loop detection module detects the connectivity of a closing control loop and inputs a first feedback signal to the MCU; the opening loop detection module detects the connectivity of an opening control loop and inputs a second feedback signal to the MCU; the closing pressing plate state detection module detects the state of a closing pressing plate and inputs a third feedback signal to the MCU; the opening pressing plate state detection module detects the state of the opening pressing plate and inputs a fourth feedback signal to the MCU; and the MCU judges whether the states of the opening and closing control loop and the opening and closing pressing plate are normal or not based on the group of feedback signals. According to the technical scheme, the effect of improving the reliability of the power distribution system is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of electric power, and particularly relates to a device and method for detecting the closing and opening control circuit of a distribution terminal. Background Art

[0002] When a fault occurs in a distribution network line, the distribution terminal needs to output a control signal to drive the primary switchgear to trip. However, the terminal and the switch are two independently installed components, which are connected by a cable in the middle. Therefore, in the process of use, there may be situations of open circuit or poor contact in the control circuit. When such a situation occurs, it will lead to the failure of the switch to close and open, and then cause accidents. In addition, hard pressure plates (including closing pressure plates and opening pressure plates) are connected in series in the control circuit to disconnect the circuit during equipment maintenance to prevent the switch from malfunctioning. The design of the distribution terminal in the related art does not monitor the state of the pressure plates, which brings inconvenience to the operation and maintenance work. Therefore, there is an urgent need for a solution that can detect the connectivity of the closing and opening control circuit and the state of the pressure plates in real time to improve the reliability and operation and maintenance efficiency of the distribution system. Summary of the Invention

[0003] The purpose of the present application is to overcome the above technical problems, and the present application provides a device and method for detecting the closing and opening control circuit of a distribution terminal.

[0004] In a first aspect, the present application provides a detection device for the closing and opening control circuits of a distribution terminal, comprising: a detection unit, including a closing circuit detection module, an opening circuit detection module, a closing pressure plate state detection module, and an opening pressure plate state detection module; an MCU, configured to send a pulse test signal to the detection unit and receive a set of feedback signals input by the detection unit; the MCU is electrically connected to the closing circuit detection module and the opening circuit detection module respectively through a first optocoupler, the closing circuit detection module is connected between the first end of the closing pressure plate and the second end of the closing coil, wherein the closing pressure plate is connected in series in the closing control circuit, the second end of the closing pressure plate is electrically connected to the first end of the closing coil, and the closing circuit detection module is configured to detect the connectivity of the closing control circuit and input a first feedback signal to the MCU; the opening circuit detection module is connected between the first end of the opening pressure plate and the second end of the opening coil, wherein the opening pressure plate is connected in series in the opening control circuit, the second end of the opening pressure plate is electrically connected to the first end of the opening coil, and the opening circuit detection module is configured to detect the connectivity of the opening control circuit and input a second feedback signal to the MCU; the MCU is electrically connected to the closing pressure plate state detection module and the opening pressure plate state detection module respectively through a second optocoupler, the closing pressure plate state detection module is connected in parallel across the two ends of the closing pressure plate, wherein the closing pressure plate state detection module is configured to detect the state of the closing pressure plate and input a third feedback signal to the MCU; the opening pressure plate state detection module is connected in parallel across the two ends of the opening pressure plate, wherein the opening pressure plate state detection module is configured to detect the state of the opening pressure plate and input a fourth feedback signal to the MCU; the MCU is configured to determine whether the closing and opening control circuits and the states of the closing and opening pressure plates are normal based on a set of feedback signals, wherein the set of feedback signals includes the first feedback signal, the second feedback signal, the third feedback signal, and the fourth feedback signal, the closing and opening control circuits include an opening control circuit and a closing control circuit, and the closing and opening pressure plates include an opening pressure plate and a closing pressure plate.

[0005] By adopting the above technical solution, the closing loop detection module is connected between the first end of the closing pressure plate and the second end of the closing coil, and is used to detect the connectivity of the closing control loop and input a first feedback signal to the MCU. The opening loop detection module is connected between the first end of the opening pressure plate and the second end of the opening coil, and is used to detect the connectivity of the opening control loop and input a second feedback signal to the MCU. The closing pressure plate state detection module is connected in parallel to both ends of the closing pressure plate, and is used to detect the state of the closing pressure plate and input a third feedback signal to the MCU. The opening pressure plate state detection module is connected in parallel to both ends of the opening pressure plate, and is used to detect the state of the opening pressure plate and input a fourth feedback signal to the MCU. The MCU sends a pulse test signal to the detection unit to trigger the detection unit to perform detection. The MCU receives a set of feedback signals input by the detection unit and determines whether the opening and closing control loops and the states of the opening and closing pressure plates are normal according to this set of feedback signals. A device that can comprehensively detect the connectivity of the opening and closing control loops and the states of the pressure plates of the distribution terminal is realized. This device can not only judge the loop connectivity by the MCU sending a pulse test signal to the detection unit and receiving a set of feedback signals, but also monitor the states of the closing pressure plate and the opening pressure plate at the same time, thus effectively avoiding the problem of switch operation failure caused by the opening or poor contact of the control loop, and achieving the effect of improving the reliability of the distribution system.

[0006] Optionally, the target output terminal of the MCU is electrically connected to the first input terminal of the first optocoupler, the second input terminal of the first optocoupler is electrically connected to the ground terminal, the target output terminal of the MCU is used to output a pulse test signal, and the target output terminal of the MCU is also electrically connected to the first input terminal of the second optocoupler, and the second input terminal of the second optocoupler is electrically connected to the ground terminal.

[0007] By adopting the above technical solution, electrical isolation between the MCU and the closing loop detection module, the opening loop detection module, the closing pressure plate state detection module and the opening pressure plate state detection module is realized through the first optocoupler and the second optocoupler, effectively avoiding the influence of strong electrical signals on the MCU, and improving the anti-interference ability and reliability of the system. The target output terminal of the MCU is electrically connected to the first input terminal of the first optocoupler, and the pulse test signal is transmitted to the closing loop detection module and the opening loop detection module through the first optocoupler. At the same time, the target output terminal is also electrically connected to the first input terminal of the second optocoupler, and the pulse test signal is transmitted to the closing pressure plate state detection module and the opening pressure plate state detection module through the second optocoupler. This design ensures the stability of the pulse test signal during transmission, reduces signal attenuation and distortion, and thus guarantees the accuracy of the detection results.

[0008] Optionally, the closing circuit detection module includes: a third optocoupler, a first diode, a first resistor, a second resistor, and a third resistor. Among them, the first output terminal of the first optocoupler is electrically connected to the positive pole of the first power supply. The second output terminal of the first optocoupler is electrically connected to the first input terminal of the third optocoupler through the first diode. The second input terminal of the third optocoupler is electrically connected to the first end of the closing pressure plate through the first resistor. The second end of the closing coil is electrically connected to the negative pole of the first power supply through the second resistor. The first output terminal of the third optocoupler is electrically connected to the positive pole of the third power supply through the third resistor. The second output terminal of the third optocoupler is electrically connected to the grounding terminal. Among them, the first output terminal of the third optocoupler is used to output a first feedback signal.

[0009] By adopting the above technical solution, the third optocoupler is used to detect the connectivity of the closing control circuit. The second input terminal of the third optocoupler is connected to the first end of the closing pressure plate through the first resistor. The first output terminal of the third optocoupler is connected to the positive pole of the third power supply through the third resistor. The second output terminal of the third optocoupler is grounded. The first output terminal of the third optocoupler is used to output a first feedback signal, which reflects the connectivity of the closing control circuit and is transmitted to the MCU for further processing.

[0010] Optionally, the closing pressure plate state detection module includes: a fourth optocoupler, a second diode, a fourth resistor, a fifth resistor, and a sixth resistor. Among them, the first output terminal of the second optocoupler is electrically connected to the positive pole of the second power supply. The second output terminal of the second optocoupler is electrically connected to the first input terminal of the fourth optocoupler through the second diode. The second input terminal of the fourth optocoupler is electrically connected to the first end of the closing pressure plate through the fourth resistor. The second end of the closing pressure plate is also electrically connected to the negative pole of the second power supply through the fifth resistor. The first output terminal of the fourth optocoupler is electrically connected to the positive pole of the third power supply through the sixth resistor. The second output terminal of the fourth optocoupler is electrically connected to the grounding terminal. Among them, the first output terminal of the fourth optocoupler is used to output a third feedback signal.

[0011] By adopting the above technical solution, accurate detection of the state of the closing pressure plate is achieved. Specifically, the circuit structure composed of the fourth optocoupler, the second diode, and related resistors can accurately judge whether the closing pressure plate is normally inserted or not inserted under different voltage levels. This design scheme improves the overall reliability of the closing and opening control circuits in the power distribution system, and at the same time provides a clear state indication for the operation and maintenance personnel, thus improving the maintenance efficiency and safety of the system.

[0012] Optionally, the opening circuit detection module includes: a fifth optocoupler, a third diode, a seventh resistor, an eighth resistor, and a ninth resistor. Among them, the first output terminal of the first optocoupler is electrically connected to the positive pole of the first power supply. The second output terminal of the first optocoupler is electrically connected to the first input terminal of the fifth optocoupler through the third diode. The second input terminal of the fifth optocoupler is electrically connected to the first end of the opening pressure plate through the seventh resistor. The second end of the opening coil is electrically connected to the negative pole of the first power supply through the eighth resistor. The first output terminal of the fifth optocoupler is electrically connected to the positive pole of the third power supply through the ninth resistor. The second output terminal of the fifth optocoupler is electrically connected to the ground terminal. Among them, the first output terminal of the fifth optocoupler is used to output a second feedback signal.

[0013] By adopting the above technical solution, the fifth optocoupler is used to detect the connectivity of the opening control circuit. The second input terminal of the fifth optocoupler is connected to the first end of the opening pressure plate through the seventh resistor. The first output terminal of the fifth optocoupler is connected to the positive pole of the third power supply through the ninth resistor. The second output terminal of the fifth optocoupler is grounded. The third diode is connected between the second output terminal of the first optocoupler and the first input terminal of the fifth optocoupler to prevent reverse current and protect the fifth optocoupler. The seventh resistor is connected between the second input terminal of the fifth optocoupler and the first end of the opening pressure plate to limit the current and ensure that the input current of the fifth optocoupler is within a safe range. The eighth resistor is connected between the second end of the opening coil and the negative pole of the first power supply to limit the current and protect the opening coil. The ninth resistor is connected between the first output terminal of the fifth optocoupler and the positive pole of the third power supply to limit the current and ensure that the output current of the fifth optocoupler is within a safe range. The first output terminal of the fifth optocoupler is used to output a second feedback signal, which reflects the connectivity of the opening control circuit and is transmitted to the MCU for further processing.

[0014] Optionally, the opening pressure plate state detection module includes: a sixth optocoupler, a fourth diode, a tenth resistor, an eleventh resistor, and a twelfth resistor. Among them, the first output terminal of the second optocoupler is electrically connected to the positive pole of the second power supply. The second output terminal of the second optocoupler is electrically connected to the first input terminal of the sixth optocoupler through the fourth diode. The second input terminal of the sixth optocoupler is electrically connected to the first end of the opening pressure plate through the tenth resistor. The second end of the opening pressure plate is also electrically connected to the negative pole of the second power supply through the eleventh resistor. The first output terminal of the sixth optocoupler is electrically connected to the positive pole of the third power supply through the twelfth resistor. The second output terminal of the sixth optocoupler is electrically connected to the ground terminal. Among them, the first output terminal of the sixth optocoupler is used to output a fourth feedback signal.

[0015] By adopting the above technical solution, the sixth optocoupler is used to detect the state of the opening gate pressure plate, the second input end of the sixth optocoupler is connected to the first end of the opening gate pressure plate through the tenth resistor, the first output end of the sixth optocoupler is connected to the positive electrode of the third power supply through the twelfth resistor, and the second output end of the sixth optocoupler is grounded; the fourth diode is connected between the second output end of the second optocoupler and the first input end of the sixth optocoupler, and is used to prevent reverse current and protect the sixth optocoupler; the tenth resistor is connected between the second input end of the sixth optocoupler and the first end of the opening gate pressure plate, and is used to limit current to ensure that the input current of the sixth optocoupler is within a safe range, and the eleventh resistor is connected between the second end of the opening gate pressure plate and the negative electrode of the second power supply, and is used to limit current to protect the opening gate pressure plate; the twelfth resistor is connected between the first output end of the sixth optocoupler and the positive electrode of the third power supply, and is used to limit current to ensure that the output current of the sixth optocoupler is within a safe range; the first output end of the sixth optocoupler is used to output a fourth feedback signal, which reflects the state of the opening gate pressure plate and is transmitted to the MCU for further processing. Through the precise control of the sixth optocoupler and the resistor, the detection results of the trip pressure plate state are ensured to be accurate and reliable, thereby improving the detection accuracy of the system; the combination of the fourth diode and the resistor effectively prevents reverse current and overcurrent, protects the detection module and the trip pressure plate, and extends the service life of the equipment; the use of the sixth optocoupler realizes the electrical isolation of the detection signal from the high-voltage circuit, prevents interference during signal transmission, and improves the anti-interference ability of the system.

[0016] Optionally, the MCU is used to determine whether the opening and closing control circuit and the status of the opening and closing pressure plate are normal in the following manner: the MCU determines whether the connectivity of the closing control circuit and the status of the closing pressure plate are normal based on the first feedback signal and the third feedback signal; the MCU determines whether the connectivity of the opening control circuit and the status of the opening pressure plate are normal based on the second feedback signal and the fourth feedback signal.

[0017] By adopting the above technical solution, based on the coordination of the first feedback signal and the third feedback signal, it is possible to accurately judge the connectivity of the closing control circuit and whether the state of the closing pressure plate is normal, thereby effectively avoiding the problem of switch operation failure caused by abnormal closing circuit or incorrect closing pressure plate input; based on the coordination of the second feedback signal and the fourth feedback signal, it is possible to accurately evaluate the connectivity of the opening control circuit and whether the state of the opening pressure plate is normal, further improving the system operation reliability and reducing the safety hazards caused by opening circuit failure or incorrect opening pressure plate setting. On the whole, this technical solution significantly improves the monitoring capability and operation and maintenance efficiency of the distribution system, and ensures the safe and stable operation of power equipment. The MCU not only monitors the connectivity of the control circuit, but also monitors the state of the pressure plate, realizes comprehensive monitoring of the opening and closing control circuit and the state of the pressure plate, and improves the reliability of the system.

[0018] Optionally, the MCU makes judgments based on a set of feedback signals in the following manner: when the first feedback signal is at a low level and the third feedback signal is at a low level, it is judged that the connectivity of the closing control loop is normal and that the closing pressure plate is in a normal input state; when the first feedback signal is at a high level and the third feedback signal is at a low level, it is judged that the closing pressure plate is in a normal input state and that there is an abnormality in the connectivity of the closing control loop; when the first feedback signal is at a high level and the third feedback signal is at a high level, it is judged that the closing pressure plate is not in an input state; when the second feedback signal is at a low level and the fourth feedback signal is at a low level, it is judged that the connectivity of the opening control loop is normal and that the opening pressure plate is in a normal input state; when the second feedback signal is at a high level and the fourth feedback signal is at a low level, it is judged that the opening pressure plate is in a normal input state and that there is an abnormality in the connectivity of the opening control loop; when the second feedback signal is at a high level and the fourth feedback signal is at a high level, it is judged that the opening pressure plate is not in an input state.

[0019] By adopting the above technical solution, through the clear level logic relationship, the MCU can accurately judge the specific states of the closing and opening systems, quickly distinguish whether it is a control loop problem or a pressure plate state problem, and improve the accuracy of fault diagnosis; the MCU can quickly locate the fault point according to the level state of the feedback signal, helping the operation and maintenance personnel quickly determine whether it is a control loop problem or a pressure plate state problem, and improving the operation and maintenance efficiency.

[0020] In the second aspect of the present application, a method for detecting the closing and opening control loops of a distribution terminal is further provided, which is applied to the distribution terminal closing and opening control loop detection device of any one of the foregoing, and includes: sending a pulse test signal to the detection unit; receiving a set of feedback signals fed back by the detection unit; and judging whether the states of the closing and opening control loops and the closing and opening pressure plates are normal based on the set of feedback signals.

[0021] Optionally, based on a set of feedback signals, it is determined whether the closing and opening control circuits and the closing and opening pressure plates are in a normal state, including: when the first feedback signal is at a low level and the third feedback signal is at a low level, it is determined that the connectivity of the closing control circuit is normal, and it is determined that the closing pressure plate is in a normal input state; when the first feedback signal is at a high level and the third feedback signal is at a low level, it is determined that the closing pressure plate is in a normal input state and the connectivity of the closing control circuit is abnormal; when the first feedback signal is at a high level and the third feedback signal is at a high level, it is determined that the closing pressure plate is not in the input state; when the second feedback signal is at a low level and the fourth feedback signal is at a low level, it is determined that the connectivity of the opening control circuit is normal, and it is determined that the opening pressure plate is in a normal input state; when the second feedback signal is at a high level and the fourth feedback signal is at a low level, it is determined that the opening pressure plate is in a normal input state and the connectivity of the opening control circuit is abnormal; when the second feedback signal is at a high level and the fourth feedback signal is at a high level, it is determined that the opening pressure plate is not in the input state.

[0022] In the third aspect of the present application, an electronic device is further provided, including a memory and a processor. A computer program is stored on the memory, and when the processor executes the program, the method steps of any one of the above are implemented.

[0023] In the fourth aspect of the present application, a computer-readable storage medium is further provided. The computer-readable storage medium stores instructions, and when the instructions are executed, the method steps of any one of the above are executed.

[0024] In summary, one or more technical solutions provided in the present application have at least the following technical effects or advantages: 1. A device capable of comprehensively detecting the connectivity of the closing and opening control circuits and the state of the pressure plates of a distribution terminal is realized. This device can not only send pulse test signals to the detection unit through the MCU and receive a set of feedback signals to judge the circuit connectivity, but also monitor the states of the closing and opening pressure plates at the same time, thus effectively avoiding the problem of switch operation failure caused by the opening or poor contact of the control circuit, achieving the effect of improving the reliability of the distribution system; 2. Electrical isolation between the MCU and the closing circuit detection module, opening circuit detection module, closing pressure plate state detection module, and opening pressure plate state detection module is realized through the first optocoupler and the second optocoupler, effectively avoiding the influence of strong electrical signals on the MCU, and improving the anti-interference ability and reliability of the system; 3. It can accurately judge whether the closing pressure plate is normally input or not input under different voltage levels, improving the overall reliability of the closing and opening control circuits in the distribution system, and at the same time providing clear state indications for maintenance personnel, thereby improving the maintenance efficiency and safety of the system; 4. Significantly improves the monitoring ability and operation and maintenance efficiency of the power distribution system, ensuring the safe and stable operation of power equipment; 5. Through clear level logic relationships, the MCU can accurately judge the specific states of the closing and opening systems, quickly distinguish whether it is a problem with the control loop or the state of the pressure plate, improving the accuracy of fault diagnosis; the MCU can quickly locate the fault point based on the level state of the feedback signal, helping the operation and maintenance personnel quickly determine whether it is a problem with the control loop or the state of the pressure plate, improving the operation and maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a framework diagram of a closing and opening control loop detection device for a power distribution terminal provided by an embodiment of the present application; Figure 2 is a flowchart of a method for detecting a closing and opening control loop of a power distribution terminal provided by an embodiment of the present application; Figure 3 is a schematic diagram of a closing and opening loop detection system provided by an embodiment of the present application; Figure 4 is a schematic diagram of a closing and opening loop detection circuit provided by an embodiment of the present application; Figure 5 is a wiring schematic diagram of a closing and opening loop detection system provided by an embodiment of the present application.

[0026] DESCRIPTION OF THE REFERENCE NUMERALS: U1 - First optocoupler, U2 - Second optocoupler, U3 - Third optocoupler, U4 - Fourth optocoupler, U5 - Fifth optocoupler, U6 - Sixth optocoupler, R1 - First resistor, R2 - Second resistor, R3 - Third resistor, R4 - Fourth resistor, R5 - Fifth resistor, R6 - Sixth resistor, R7 - Seventh resistor, R8 - Eighth resistor, R9 - Ninth resistor, R10 - Tenth resistor, R11 - Eleventh resistor, R12 - Twelfth resistor, R13 - Thirteenth resistor, R14 - Fourteenth resistor, D1 - First diode, D2 - Second diode, D3 - Third diode, D4 - Fourth diode. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to enable those skilled in the art to better understand the technical solutions in this specification, the following will clearly and completely describe the technical solutions in the embodiments of this specification with reference to the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0028] In the description of the embodiments of the present application, words such as "for example" or "for illustration" are used to give examples, illustrations or explanations. Any embodiment or design described as "for example" or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "for example" or "for illustration" is intended to present the relevant concepts in a specific manner.

[0029] In the description of the embodiments of the present application, the term "a plurality of" means two or more. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the technical features indicated. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The terms "comprise", "include", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0030] The present application provides a detection device for the opening and closing control circuit of a distribution terminal. Refer to Figure 1 , Figure 1It is a framework diagram of a device for detecting the closing and opening control circuits of a distribution terminal provided by an embodiment of the present application. The device includes: a detection unit, which includes a closing circuit detection module, an opening circuit detection module, a closing pressure plate state detection module, and an opening pressure plate state detection module; an MCU, which is used to send a pulse test signal to the detection unit and receive a set of feedback signals input by the detection unit; the MCU is electrically connected to the closing circuit detection module and the opening circuit detection module through a first optocoupler respectively. The closing circuit detection module is connected between the first end of the closing pressure plate and the second end of the closing coil. Among them, the closing pressure plate is connected in series in the closing control circuit, and the second end of the closing pressure plate is electrically connected to the first end of the closing coil. The closing circuit detection module is used to detect the connectivity of the closing control circuit and input a first feedback signal to the MCU; the opening circuit detection module is connected between the first end of the opening pressure plate and the second end of the opening coil. Among them, the opening pressure plate is connected in series in the opening control circuit, and the second end of the opening pressure plate is electrically connected to the first end of the opening coil. The opening circuit detection module is used to detect the connectivity of the opening control circuit and input a second feedback signal to the MCU; the MCU is electrically connected to the closing pressure plate state detection module and the opening pressure plate state detection module through a second optocoupler respectively. The closing pressure plate state detection module is connected in parallel at both ends of the closing pressure plate. Among them, the closing pressure plate state detection module is used to detect the state of the closing pressure plate and input a third feedback signal to the MCU; the opening pressure plate state detection module is connected in parallel at both ends of the opening pressure plate. Among them, the opening pressure plate state detection module is used to detect the state of the opening pressure plate and input a fourth feedback signal to the MCU; the MCU is used to judge whether the closing and opening control circuits and the states of the closing and opening pressure plates are normal based on a set of feedback signals. Among them, a set of feedback signals includes the first feedback signal, the second feedback signal, the third feedback signal, and the fourth feedback signal. The closing and opening control circuits include an opening control circuit and a closing control circuit, and the closing and opening pressure plates include an opening pressure plate and a closing pressure plate.

[0031] In the above embodiment, the closing loop detection module is connected between the first end of the closing pressure plate and the second end of the closing coil, and is used to detect the connectivity of the closing control loop and input a first feedback signal to the MCU. The opening loop detection module is connected between the first end of the opening pressure plate and the second end of the opening coil, and is used to detect the connectivity of the opening control loop and input a second feedback signal to the MCU. The closing pressure plate state detection module is connected in parallel at both ends of the closing pressure plate, and is used to detect the state of the closing pressure plate and input a third feedback signal to the MCU. The opening pressure plate state detection module is connected in parallel at both ends of the opening pressure plate, and is used to detect the state of the opening pressure plate and input a fourth feedback signal to the MCU. The MCU sends a pulse test signal to the detection unit to trigger the detection unit to perform detection. The MCU receives a set of feedback signals input by the detection unit and determines whether the opening and closing control loops and the states of the opening and closing pressure plates are normal according to this set of feedback signals. A device capable of comprehensively detecting the connectivity of the opening and closing control loops of the distribution terminal and the state of the pressure plates is realized. The device can not only judge the loop connectivity by sending a pulse test signal to the detection unit by the MCU and receiving a set of feedback signals, but also monitor the states of the closing pressure plate and the opening pressure plate at the same time, thus effectively avoiding the problem of switch operation failure caused by the opening or poor contact of the control loop, and achieving the effect of improving the reliability of the distribution system.

[0032] In the related art, the design of the distribution terminal does not perform real-time monitoring on the connectivity of the closing and opening control circuits, resulting in the inability to detect and handle in a timely manner when the control circuit is open or has poor contact, which may cause switch and opening failures and further lead to accidents; and in the related art, the states of the hard pressure plates (closing pressure plate and opening pressure plate) are not monitored, and the state of the pressure plates cannot be understood in real time during equipment maintenance, increasing the complexity and risk of operation and maintenance. Due to the lack of real-time monitoring of the control circuit and the state of the pressure plates, maintenance personnel need to manually check and troubleshoot faults, with low efficiency and prone to errors. The detection unit of this embodiment includes a closing circuit detection module, an opening circuit detection module, a closing pressure plate state detection module, and an opening pressure plate state detection module. These modules are respectively responsible for detecting the connectivity of the closing control circuit, the opening control circuit, and the states of the closing pressure plate and the opening pressure plate. The MCU sends a pulse test signal to the detection unit and receives the feedback signal returned by the detection unit. By analyzing these feedback signals, the MCU can determine whether the states of the closing and opening control circuits and the pressure plates are normal. The MCU is connected to each detection module through an optocoupler to ensure electrical isolation and improve the safety and anti-interference ability of the system. The feedback signals received by the MCU include the first feedback signal of the closing circuit detection module, the second feedback signal of the opening circuit detection module, the third feedback signal of the closing pressure plate state detection module, and the fourth feedback signal of the opening pressure plate state detection module. Through these signals, the MCU can comprehensively understand the states of the control circuit and the pressure plates. Through this embodiment, by real-time monitoring the connectivity of the closing and opening control circuits and the states of the pressure plates, loop faults can be detected and handled in a timely manner, avoiding switch and opening failures and reducing the possibility of accidents; maintenance personnel can obtain the state information of the control circuit and the pressure plates in real time through the MCU without manual inspection, greatly improving the operation and maintenance efficiency and reducing the error rate of manual operations; through optocoupler isolation and real-time monitoring, the system can effectively prevent misoperations and electrical interferences, improving the overall safety of the distribution system; real-time monitoring of the state of the pressure plates enables quick judgment of whether the pressure plates are in the correct state during equipment maintenance, simplifying the maintenance process and reducing the maintenance risk.

[0033] In an optional embodiment, the target output terminal of the MCU is electrically connected to the first input terminal of the first optocoupler U1, the second input terminal of the first optocoupler U1 is electrically connected to the ground terminal, the target output terminal of the MCU is used to output a pulse test signal, and the target output terminal of the MCU is also electrically connected to the first input terminal of the second optocoupler U2, and the second input terminal of the second optocoupler U2 is electrically connected to the ground terminal.

[0034] In the above embodiment, as Figure 4 shown, the first optocoupler U1 is connected to the MCU through the thirteenth resistor R13, Figure 4 the MCU is not shown in Figure 3, the second optocoupler U2 is connected to the MCU through the fourteenth resistor R14. Electrical isolation between the MCU and the closing loop detection module, opening loop detection module, closing switch status detection module, and opening switch status detection module is achieved through the first optocoupler U1 and the second optocoupler U2, effectively avoiding the impact of strong electrical signals on the MCU and improving the anti-interference ability and reliability of the system. The target output terminal of the MCU is electrically connected to the first input terminal of the first optocoupler U1, and the pulse test signal is transmitted to the closing loop detection module and the opening loop detection module through the first optocoupler U1. At the same time, the target output terminal is also electrically connected to the first input terminal of the second optocoupler U2, and the pulse test signal is transmitted to the closing switch status detection module and the opening switch status detection module through the second optocoupler U2. This design ensures the stability of the pulse test signal during transmission, reduces signal attenuation and distortion, and thus guarantees the accuracy of the detection results.

[0035] An optocoupler (optoelectronic coupler) is a device that realizes electrical signal isolation through optical signals. It can transmit signals between the MCU and the detection module while isolating the interference of the strong electrical circuit to the MCU, protecting the MCU from high-voltage impact and electromagnetic interference. The first optocoupler U1 is used to connect the MCU to the closing loop detection module and the opening loop detection module. The target output terminal of the MCU (i.e., the output terminal of the pulse test signal) is connected to the first input terminal of the first optocoupler U1, and the second input terminal of the first optocoupler U1 is grounded. In this way, when the MCU sends a pulse test signal, it is isolated and transmitted to the closing and opening loop detection modules through the first optocoupler U1. The second optocoupler U2 is used to connect the MCU to the closing switch status detection module and the opening switch status detection module. Similarly, the target output terminal of the MCU is also connected to the first input terminal of the second optocoupler U2, and the second input terminal of the second optocoupler U2 is grounded, enabling the MCU to transmit the pulse test signal to the closing and opening switch status detection modules through the second optocoupler U2. In the power distribution system, due to the potential difference between the high-voltage side and the low-voltage side, direct connection may cause signal interference or even damage to the equipment. By using optocouplers to achieve electrical isolation, these problems can be effectively avoided. In this embodiment, electrical isolation is achieved through optocouplers, improving the reliability and stability of signal transmission and reducing misoperations caused by electrical interference; optocouplers not only provide electrical isolation but also protect the MCU from possible damage from the high-voltage side, enhancing the safety of the entire system. By connecting the target output terminal of the MCU to both the first optocoupler U1 and the second optocoupler U2 simultaneously, the circuit structure is simplified, the system complexity is reduced, and it is convenient for maintenance and debugging.

[0036] In an alternative embodiment, as Figure 4As shown in the figure, the closing circuit detection module includes: the third optocoupler U3, the first diode D1, the first resistor R1, the second resistor R2, and the third resistor R3. Among them, the first output terminal of the first optocoupler U1 is electrically connected to the positive pole of the first power supply. The second output terminal of the first optocoupler U1 is electrically connected to the first input terminal of the third optocoupler U3 through the first diode D1. The second input terminal of the third optocoupler U3 is electrically connected to the first end of the closing pressure plate through the first resistor R1. The second end of the closing coil is electrically connected to the negative pole of the first power supply through the second resistor R2. The first output terminal of the third optocoupler U3 is electrically connected to the positive pole of the third power supply through the third resistor R3. The second output terminal of the third optocoupler U3 is electrically connected to the grounding terminal. Among them, the first output terminal of the third optocoupler U3 is used to output the first feedback signal.

[0037] In the above embodiment, the third optocoupler U3 is used to detect the connectivity of the closing control circuit. The second input terminal of the third optocoupler U3 is connected to the first end of the closing pressure plate through the first resistor R1. The first output terminal of the third optocoupler U3 is connected to the positive pole of the third power supply (such as Figure 4 VDD in it) through the third resistor R3. The second output terminal of the third optocoupler U3 is grounded. The first output terminal of the third optocoupler U3 is used to output the first feedback signal, which reflects the connectivity of the closing control circuit and is transmitted to the MCU for further processing.

[0038] The MCU sends a pulse test signal to the closing circuit detection module through the first optocoupler U1. The first output terminal of the first optocoupler U1 is electrically connected to the positive pole of the first power supply (such as Figure 4 VDD1+ in it). The second output terminal of the first optocoupler U1 is electrically connected to the first input terminal of the third optocoupler U3 through the first diode D1. The third optocoupler U3 is a key component for signal isolation and transmission. The second input terminal of the third optocoupler U3 is electrically connected to the first end of the closing pressure plate through the first resistor R1. The second end of the closing coil is electrically connected to the negative pole of the first power supply (such as Figure 4is electrically connected to the positive electrode of the third power supply through the third resistor R3, and the second output terminal of the third optocoupler U3 is electrically connected to the ground terminal. The first output terminal of the third optocoupler U3 is used to output a first feedback signal indicating the connectivity status of the closing control loop. When the MCU sends a pulse test signal through the first optocoupler U1, the signal is transmitted to the first input terminal of the third optocoupler U3 through the first diode D1. If the closing control loop (including the closing pressure plate and the closing coil) is connected, the pulse signal can be transmitted to the second input terminal of the third optocoupler U3 through the closing pressure plate and the closing coil, triggering the third optocoupler U3 to conduct. After the third optocoupler U3 conducts, the first output terminal of the third optocoupler U3 outputs a first feedback signal indicating that the closing control loop is normally connected. If the loop is open or has poor contact, the third optocoupler U3 will not conduct, and the first feedback signal will indicate an abnormal state. In this embodiment, through the combination of the optocoupler and the resistor, the accurate detection of the connectivity of the closing control loop is realized. The signal isolation function of the optocoupler ensures the stability and accuracy of the detection signal, and can effectively distinguish the normal and abnormal states of the loop. The first output terminal of the third optocoupler U3 can output a first feedback signal, transmitting the connectivity status of the closing control loop to the MCU in real time. This real-time feedback mechanism enables the operation and maintenance personnel to understand the loop status in a timely manner, facilitating the rapid adoption of measures.

[0039] The second input terminal of the third optocoupler U3 is connected to the first end of the closing pressure plate through the first resistor R1, ensuring that the current can be transmitted to the third optocoupler U3 through the closing control loop. When the closing control loop conducts, the third optocoupler U3 will receive sufficient current and output a low-level first feedback signal, indicating that the closing control loop is normally conducting; otherwise, if the closing control loop is open or has poor contact, the third optocoupler U3 cannot receive sufficient current and will output a high-level first feedback signal, indicating that there is an abnormality in the closing control loop. Through the precise control of the third optocoupler U3 and the resistor, the detection result of the closing control loop is ensured to be accurate and reliable, improving the detection accuracy of the system. By introducing the first diode D1 and appropriate resistor configuration, the reverse current and overcurrent are effectively prevented, protecting the detection module and the closing coil, extending the service life of the equipment, ensuring the stable operation of the circuit under different working conditions, and improving the accuracy and reliability of the detection. The above-mentioned first power supply can be 5V (or other voltages), and the third power supply can be 3.3V (or other voltages).

[0040] In an alternative embodiment, such as Figure 4As shown in the figure, the closing pressure plate state detection module includes: the fourth optocoupler U4, the second diode D2, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6. Among them, the first output terminal of the second optocoupler U2 is electrically connected to the positive electrode of the second power supply, the second output terminal of the second optocoupler U2 is electrically connected to the first input terminal of the fourth optocoupler U4 through the second diode D2, the second input terminal of the fourth optocoupler U4 is electrically connected to the first end of the closing pressure plate through the fourth resistor R4, the second end of the closing pressure plate is also electrically connected to the negative electrode of the second power supply through the fifth resistor R5, the first output terminal of the fourth optocoupler U4 is electrically connected to the positive electrode of the third power supply through the sixth resistor R6, and the second output terminal of the fourth optocoupler U4 is electrically connected to the grounding terminal. Among them, the first output terminal of the fourth optocoupler U4 is used to output the third feedback signal.

[0041] In the above embodiment, the accurate detection of the state of the closing pressure plate is realized. Specifically, the circuit structure composed of the fourth optocoupler U4, the second diode D2 and related resistors can accurately judge whether the closing pressure plate is normally put in or not put in under different voltage levels. This design improves the overall reliability of the closing and opening control loop in the power distribution system, and at the same time provides a clear state indication for the operation and maintenance personnel, thus improving the maintenance efficiency and safety of the system.

[0042] The MCU sends a pulse test signal to the closing pressure plate state detection module through the second optocoupler U2. The first output terminal of the second optocoupler U2 is electrically connected to the positive electrode of the second power supply (such as Figure 4 VDD2+ in it), the second output terminal is electrically connected to the first input terminal of the fourth optocoupler U4 through the second diode D2. The fourth optocoupler U4 is a key component for signal isolation and transmission. The second input terminal of the fourth optocoupler U4 is electrically connected to the first end of the closing pressure plate through the fourth resistor R4, and the second end of the closing pressure plate is connected to the negative electrode of the second power supply through the fifth resistor R5 (such as Figure 4is electrically connected to VDD2-), the first output terminal of the fourth optocoupler U4 is electrically connected to the positive electrode of the third power supply through the sixth resistor R6, the second output terminal of the fourth optocoupler U4 is electrically connected to the ground terminal, and the first output terminal of the fourth optocoupler U4 is used to output the third feedback signal. When the MCU sends a pulse test signal through the second optocoupler U2, the signal is transmitted to the first input terminal of the fourth optocoupler U4 through the second diode D2. If the closing pressure plate is in the inserted state (i.e., the circuit is connected), the pulse signal can be transmitted to the second input terminal of the fourth optocoupler U4 through the closing pressure plate, triggering the fourth optocoupler U4 to conduct. After the fourth optocoupler U4 conducts, the first output terminal of the fourth optocoupler U4 outputs the third feedback signal, indicating that the closing pressure plate is in a normal state. If the pressure plate is in the withdrawn state (i.e., the circuit is disconnected), the fourth optocoupler U4 will not conduct, and the third feedback signal will indicate an abnormality, that is, the closing pressure plate is not in the inserted state. The second diode D2 prevents the reverse flow of current, ensuring the correct transmission of the pulse test signal to the fourth optocoupler U4. The fourth resistor R4 and the fifth resistor R5 are used for current limiting to ensure the stable operation of the circuit under different working conditions. The above second power supply can be 5V (or other voltages). In this embodiment, through the combination of optocouplers and resistors, the real-time monitoring of the state of the closing pressure plate is realized. The MCU can timely understand the inserted or withdrawn state of the pressure plate according to the third feedback signal, which is convenient for quickly taking measures.

[0043] In an alternative embodiment, as Figure 4 shown, the opening circuit detection module includes: a fifth optocoupler U5, a third diode D3, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. Among them, the first output terminal of the first optocoupler U1 is electrically connected to the positive electrode of the first power supply, the second output terminal of the first optocoupler U1 is electrically connected to the first input terminal of the fifth optocoupler U5 through the third diode D3, the second input terminal of the fifth optocoupler U5 is electrically connected to the first end of the opening pressure plate through the seventh resistor R7, the second end of the opening coil is electrically connected to the negative electrode of the first power supply through the eighth resistor R8, the first output terminal of the fifth optocoupler U5 is electrically connected to the positive electrode of the third power supply through the ninth resistor R9, and the second output terminal of the fifth optocoupler U5 is electrically connected to the ground terminal. Among them, the first output terminal of the fifth optocoupler U5 is used to output the second feedback signal.

[0044] In the above embodiment, the fifth optocoupler U5 is used to detect the connectivity of the opening control circuit. The second input terminal of the fifth optocoupler U5 is connected to the first end of the opening pressure plate through the seventh resistor R7, and the first output terminal of the fifth optocoupler U5 is connected to the third power supply (such as Figure 4The positive electrode of the VDD in it is connected, and the second output terminal of the fifth optocoupler U5 is grounded; the third diode D3 is connected between the second output terminal of the first optocoupler U1 and the first input terminal of the fifth optocoupler U5 to prevent reverse current and protect the fifth optocoupler U5; the seventh resistor R7 is connected between the second input terminal of the fifth optocoupler U5 and the first end of the opening pressure plate to limit the current and ensure that the input current of the fifth optocoupler U5 is within a safe range. The eighth resistor R8 is connected between the second end of the opening coil and the negative electrode of the first power supply to limit the current and protect the opening coil. The ninth resistor R9 is connected between the first output terminal of the fifth optocoupler U5 and the positive electrode of the third power supply to limit the current and ensure that the output current of the fifth optocoupler U5 is within a safe range; the first output terminal of the fifth optocoupler U5 is used to output a second feedback signal, which reflects the connectivity of the opening control loop and is transmitted to the MCU for further processing. It solves the problems of insufficient loop detection accuracy, insufficient circuit protection, and insufficient signal isolation in the prior art, and significantly improves the detection accuracy, reliability, and anti-interference ability of the system.

[0045] The MCU sends a pulse test signal to the opening circuit detection module through the first optocoupler U1. The first output terminal of the first optocoupler U1 is electrically connected to the positive pole of the first power supply. The second output terminal of the first optocoupler U1 is electrically connected to the first input terminal of the fifth optocoupler U5 through the third diode D3. The fifth optocoupler U5 is a key component for signal isolation and transmission. The second input terminal of the fifth optocoupler U5 is electrically connected to the first end of the opening pressure plate through the seventh resistor R7. The second end of the opening coil is electrically connected to the negative pole of the first power supply through the eighth resistor R8. The first output terminal of the fifth optocoupler U5 is electrically connected to the positive pole of the third power supply through the ninth resistor R9. The second output terminal of the fifth optocoupler U5 is electrically connected to the ground terminal. The first output terminal of the fifth optocoupler U5 is used to output a second feedback signal, indicating the connectivity status of the opening control circuit. When the MCU sends a pulse test signal through the first optocoupler U1, the signal is transmitted to the first input terminal of the fifth optocoupler U5 through the third diode D3. If the opening control circuit (including the opening pressure plate and the opening coil) is connected, the pulse signal can be transmitted to the second input terminal of the fifth optocoupler U5 through the opening pressure plate and the opening coil, triggering the fifth optocoupler U5 to conduct. After the fifth optocoupler U5 conducts, the first output terminal of the fifth optocoupler U5 outputs a second feedback signal, indicating that the connectivity of the opening control circuit is normal. If the circuit is disconnected or has poor contact, the fifth optocoupler U5 will not conduct, and the second feedback signal will indicate an abnormality. In this embodiment, through the combination of optocouplers and resistors, the accurate detection of the connectivity of the opening control circuit is realized. The signal isolation function of the optocoupler ensures the stability and accuracy of the detection signal, and can effectively distinguish the normal and abnormal states of the circuit. The first output terminal of the fifth optocoupler U5 can output a second feedback signal, transmitting the connectivity status of the opening control circuit to the MCU in real time. This real-time feedback mechanism enables the operation and maintenance personnel to timely understand the circuit status and facilitate the rapid adoption of measures. The combination of the third diode D3 and the resistor effectively prevents reverse current and overcurrent, protects the detection module and the opening coil, and extends the service life of the equipment. The use of the fifth optocoupler U5 realizes the electrical isolation between the detection signal and the high-voltage circuit, prevents interference during signal transmission, and improves the anti-interference ability of the system.

[0046] In an alternative embodiment, as Figure 4As shown in the figure, the opening pressure plate state detection module includes: the sixth optocoupler U6, the fourth diode D4, the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12. Among them, the first output terminal of the second optocoupler U2 is electrically connected to the positive pole of the second power supply, the second output terminal of the second optocoupler U2 is electrically connected to the first input terminal of the sixth optocoupler U6 through the fourth diode D4, the second input terminal of the sixth optocoupler U6 is electrically connected to the first end of the opening pressure plate through the tenth resistor R10, the second end of the opening pressure plate is also electrically connected to the negative pole of the second power supply through the eleventh resistor R11, the first output terminal of the sixth optocoupler U6 is electrically connected to the positive pole of the third power supply through the twelfth resistor R12, and the second output terminal of the sixth optocoupler U6 is electrically connected to the grounding terminal. Among them, the first output terminal of the sixth optocoupler U6 is used to output the fourth feedback signal.

[0047] In the above embodiment, the sixth optocoupler U6 is used to detect the state of the opening pressure plate. The second input terminal of the sixth optocoupler U6 is connected to the first end of the opening pressure plate through the tenth resistor R10, the first output terminal of the sixth optocoupler U6 is connected to the positive pole of the third power supply through the twelfth resistor R12, and the second output terminal of the sixth optocoupler U6 is grounded; the fourth diode D4 is connected between the second output terminal of the second optocoupler U2 and the first input terminal of the sixth optocoupler U6 to prevent reverse current and protect the sixth optocoupler U6; the tenth resistor R10 is connected between the second input terminal of the sixth optocoupler U6 and the first end of the opening pressure plate to limit the current and ensure that the input terminal current of the sixth optocoupler U6 is within a safe range. The eleventh resistor R11 is connected between the second end of the opening pressure plate and the negative pole of the second power supply to limit the current and protect the opening pressure plate; the twelfth resistor R12 is connected between the first output terminal of the sixth optocoupler U6 and the positive pole of the third power supply to limit the current and ensure that the output terminal current of the sixth optocoupler U6 is within a safe range; the first output terminal of the sixth optocoupler U6 is used to output the fourth feedback signal, which reflects the state of the opening pressure plate and is transmitted to the MCU for further processing. Through the precise control of the sixth optocoupler U6 and the resistor, the detection result of the opening pressure plate state is ensured to be accurate and reliable, improving the detection accuracy of the system; the combination of the fourth diode D4 and the resistor effectively prevents reverse current and overcurrent, protects the detection module and the opening pressure plate, and extends the service life of the equipment; the use of the sixth optocoupler U6 realizes the electrical isolation between the detection signal and the high-voltage circuit, prevents interference during signal transmission, and improves the anti-interference ability of the system.

[0048] The MCU sends a pulse test signal to the opening pressure plate state detection module through the second optocoupler U2. The first output terminal of the second optocoupler U2 is electrically connected to the positive pole of the second power supply. The second output terminal of the second optocoupler U2 is electrically connected to the first input terminal of the sixth optocoupler U6 through the fourth diode D4. The sixth optocoupler U6 is a key component for signal isolation and transmission. The second input terminal of the sixth optocoupler U6 is electrically connected to the first end of the opening pressure plate through the tenth resistor R10. The second end of the opening pressure plate is electrically connected to the negative pole of the second power supply through the eleventh resistor R11. The first output terminal of the sixth optocoupler U6 is electrically connected to the positive pole of the third power supply through the twelfth resistor R12. The second output terminal of the sixth optocoupler U6 is electrically connected to the grounding terminal. The first output terminal of the sixth optocoupler U6 is used to output the fourth feedback signal indicating the state of the opening pressure plate. When the MCU sends a pulse test signal through the second optocoupler U2, the signal is transmitted to the first input terminal of the sixth optocoupler U6 through the fourth diode D4. If the opening pressure plate is in the engaged state (i.e., the circuit is connected), the pulse signal can be transmitted to the second input terminal of the sixth optocoupler U6 through the opening pressure plate, triggering the sixth optocoupler U6 to conduct. After the sixth optocoupler U6 conducts, the first output terminal of the sixth optocoupler U6 outputs the fourth feedback signal indicating that the state of the opening pressure plate is normal. If the pressure plate is in the disengaged state (i.e., the circuit is disconnected), the sixth optocoupler U6 will not conduct, and the fourth feedback signal will indicate an abnormality. In this embodiment, through the combination of optocouplers and resistors, the real-time monitoring of the state of the opening pressure plate is achieved. The MCU can timely understand the engaged or disengaged state of the pressure plate according to the fourth feedback signal, facilitating the rapid adoption of measures. The electrical isolation function of the optocoupler can effectively prevent the high-voltage signal from interfering with the detection circuit, ensuring the stability and reliability of the detection signal. By real-time monitoring the state of the opening pressure plate, the operation and maintenance personnel can timely discover potential problems and handle them, reducing the fault troubleshooting time and improving the work efficiency.

[0049] In an optional embodiment, the MCU is used to judge whether the closing and opening control circuits and the states of the closing and opening pressure plates are normal in the following manner: The MCU judges whether the connectivity of the closing control circuit and the state of the closing pressure plate are normal based on the first feedback signal and the third feedback signal. The MCU judges whether the connectivity of the opening control circuit and the state of the opening pressure plate are normal based on the second feedback signal and the fourth feedback signal.

[0050] In the above embodiments, based on the cooperation of the first feedback signal and the third feedback signal, the connectivity of the closing control loop and the state of the closing pressure plate can be accurately judged, thus effectively avoiding the problem of switch operation failure caused by abnormal closing loop or incorrect insertion of the closing pressure plate; based on the cooperation of the second feedback signal and the fourth feedback signal, the connectivity of the opening control loop and the state of the opening pressure plate can be accurately evaluated, further improving the reliability of system operation and reducing the potential safety hazards caused by opening loop faults or incorrect settings of the opening pressure plate. Overall, this embodiment significantly improves the monitoring ability and operation and maintenance efficiency of the distribution system, ensuring the safe and stable operation of power equipment. The MCU not only monitors the connectivity of the control loop, but also monitors the state of the pressure plate, realizing the comprehensive monitoring of the closing and opening control loops and the state of the pressure plate, and improving the reliability of the system.

[0051] The MCU receives the first feedback signal from the closing loop detection module and the third feedback signal from the closing pressure plate state detection module. If the first feedback signal indicates that the connectivity of the closing control loop is normal and the third feedback signal indicates that the state of the closing pressure plate is normal, the MCU judges that the overall state of the closing control loop and the closing pressure plate is normal; if any one of the first feedback signal or the third feedback signal is abnormal, the MCU judges that there is a fault in the closing control loop or the closing pressure plate. The MCU receives the second feedback signal from the opening loop detection module and the fourth feedback signal from the opening pressure plate state detection module. If the second feedback signal indicates that the connectivity of the opening control loop is normal and the fourth feedback signal indicates that the state of the opening pressure plate is normal, the MCU judges that the overall state of the opening control loop and the opening pressure plate is normal; if any one of the second feedback signal or the fourth feedback signal is abnormal, the MCU judges that there is a fault in the opening control loop or the opening pressure plate. Through this embodiment, by comprehensively analyzing the first, second, third, and fourth feedback signals, the MCU can comprehensively evaluate the closing and opening control loops and the state of the pressure plate, providing more accurate system state information. Through the clear judgment logic, the MCU can quickly distinguish whether it is a control loop problem or a pressure plate state problem, helping the operation and maintenance personnel quickly locate the fault point and reducing the fault troubleshooting time; the MCU can receive the feedback signal in real time and make a judgment, timely discover the abnormal state and issue a warning, facilitating the operation and maintenance personnel to quickly take measures to avoid the expansion of the fault; by providing accurate fault diagnosis information, it reduces the on-site inspection workload of the operation and maintenance personnel, reduces the operation and maintenance cost, and improves the operation and maintenance efficiency. Without comprehensively judging the control loop and the state of the pressure plate, it is difficult for the operation and maintenance personnel to quickly locate the fault point, increasing the operation and maintenance difficulty and time cost. In the related technologies, the lack of real-time monitoring of the control loop and the state of the pressure plate leads to the inability to timely discover potential problems, increasing the risk of system operation.

[0052] In an alternative embodiment, the MCU makes judgments based on a set of feedback signals as follows: when the first feedback signal is at a low level and the third feedback signal is at a low level, it is judged that the connectivity of the closing control loop is normal and the closing pressure plate is in a normal input state; when the first feedback signal is at a high level and the third feedback signal is at a low level, it is judged that the closing pressure plate is in a normal input state and there is an abnormality in the connectivity of the closing control loop; when the first feedback signal is at a high level and the third feedback signal is at a high level, it is judged that the closing pressure plate is not in the input state; when the second feedback signal is at a low level and the fourth feedback signal is at a low level, it is judged that the connectivity of the opening control loop is normal and the opening pressure plate is in a normal input state; when the second feedback signal is at a high level and the fourth feedback signal is at a low level, it is judged that the opening pressure plate is in a normal input state and there is an abnormality in the connectivity of the opening control loop; when the second feedback signal is at a high level and the fourth feedback signal is at a high level, it is judged that the opening pressure plate is not in the input state.

[0053] In the above embodiment, through the clear level logic relationship, the MCU can accurately judge the specific states of the closing and opening systems, quickly distinguish whether it is a control loop problem or a pressure plate state problem, and improve the accuracy of fault diagnosis; the MCU can quickly locate the fault point according to the level state of the feedback signal, helping the operation and maintenance personnel quickly determine whether it is a control loop problem or a pressure plate state problem, and improving the operation and maintenance efficiency.

[0054] When the first feedback signal is at a low level and the third feedback signal is at a low level, the MCU judges that the connectivity of the closing control loop is normal and the closing pressure plate is in a normal input state; when the first feedback signal is at a high level and the third feedback signal is at a low level, the MCU judges that the closing pressure plate is in a normal input state, but there is an abnormality in the connectivity of the closing control loop; when the first feedback signal is at a high level and the third feedback signal is at a high level, the MCU judges that the closing pressure plate is not in the input state. When the second feedback signal is at a low level and the fourth feedback signal is at a low level, the MCU judges that the connectivity of the opening control loop is normal and the opening pressure plate is in a normal input state; when the second feedback signal is at a high level and the fourth feedback signal is at a low level, the MCU judges that the opening pressure plate is in a normal input state, but there is an abnormality in the connectivity of the opening control loop; when the second feedback signal is at a high level and the fourth feedback signal is at a high level, the MCU judges that the opening pressure plate is not in the input state. In practical applications, when the first feedback signal is at a low level and the second feedback signal is at a high level, there may be a problem with the detection circuit (or detection unit) itself; or, when the third feedback signal is at a low level and the fourth feedback signal is at a high level, there may be a problem with the detection circuit (or detection unit) itself.

[0055] In this embodiment, through clear logic rules, the MCU can accurately distinguish between abnormal connectivity of the control loop and the state where the pressure plate is not inserted, avoiding misjudgment and missed judgment, and improving the accuracy of judgment; the MCU analyzes the level state of the feedback signal in real time, can timely detect the abnormal state of the control loop or the pressure plate, give an early warning, and avoid the occurrence of accidents; through the logical judgment rules, the MCU can automatically identify and report faults, reduce the dependence on manual intervention, and improve the intelligent level of the power distribution system.

[0056] In an alternative embodiment, the first resistor R1 and the second resistor R2 satisfy the following conditions: I1 = (VDD1 - V ce -V D ) / (R1 + R2 + R X ), and when the closing control loop is conducting, I1 is greater than or equal to a preset current threshold, and the preset current threshold represents the minimum conduction current of the first optocoupler U1; where, VDD1 represents the voltage of the first power supply, V ce represents the secondary saturation conduction voltage drop of the first optocoupler U1, V D represents the primary conduction voltage drop of the third optocoupler U3, R1 is the first resistor, R2 is the second resistor, and R X is the loop resistance when the closing control loop is normally conducting.

[0057] In the above embodiment, it is ensured that the closing control loop can provide sufficient current when conducting, so that the first optocoupler conducts reliably, thereby accurately detecting the connectivity of the closing control loop. At the same time, this condition also ensures that when there is an abnormality in the closing control loop, the first optocoupler will not make a misjudgment, improving the reliability of the entire detection device.

[0058] It should be noted that the fourth resistor R4 and the fifth resistor R5 in the closing pressure plate state detection module in the foregoing embodiment can also be determined by a method similar to that of the first resistor R1 and the second resistor R2 above; similarly, the seventh resistor R7 and the eighth resistor R8, and the tenth resistor R10 and the eleventh resistor R11 are also similar, and the design method of the first resistor R1 and the second resistor R2 above can be referred to, which will not be elaborated here.

[0059] This application also provides a method for detecting the closing and opening control loop of a power distribution terminal, which is applied to the power distribution terminal closing and opening control loop detection device in any of the foregoing embodiments, Figure 2 is a flowchart of a method for detecting the closing and opening control loop of a power distribution terminal provided by an embodiment of this application, and this process includes: Step S201, send a pulse test signal to the detection unit; Step S202, receive a set of feedback signals fed back by the detection unit; Step S203, judge whether the states of the closing and opening control loop and the closing and opening pressure plate are normal based on a set of feedback signals.

[0060] Through the above steps, by sending a pulse test signal to the detection unit and receiving the feedback signal to judge the status of the closing and opening control circuits and the pressure plate, it is ensured that faults can be detected and processed in a timely manner during a failure, avoiding the problem of switch malfunction caused by the opening or poor contact of the control circuit; by comprehensively detecting the closing and opening control circuits and their corresponding pressure plate states, the workload of manual inspection is reduced, enabling the operation and maintenance personnel to quickly locate and solve faults, thus improving the maintenance efficiency of the entire power distribution system; this method not only monitors the connectivity of the control circuit, but also monitors the status of the pressure plate at the same time, ensuring that it is possible to accurately know whether the pressure plate has been correctly disconnected during equipment maintenance and preventing safety accidents caused by misoperation; through a set of feedback signals, the connectivity of the closing control circuit and the status of the closing pressure plate can be accurately judged. Similarly, the connectivity of the opening control circuit and the status of the opening pressure plate can be judged, providing a clear direction for troubleshooting. The purpose of real-time detection of the closing and opening control circuits and the pressure plate status of the power distribution terminal is achieved.

[0061] In the above embodiment, the MCU sends a pulse test signal to the detection unit to trigger the closing and opening loop detection module and the pressure plate status detection module for detection. After receiving the pulse test signal, the detection unit detects the connectivity of the closing and opening control circuits and the pressure plate status, and sends the detection results back to the MCU in the form of a feedback signal; based on the received feedback signal, the MCU judges whether the status of the closing and opening control circuits and the closing and opening pressure plates is normal according to the preset logic. If the feedback signal conforms to the logical relationship of the normal state, it is determined that the system state is normal; otherwise, it is determined that there is an abnormality. In this embodiment, by the MCU continuously sending a pulse test signal and receiving a set of feedback signals, real-time monitoring of the closing and opening control circuits and the pressure plate status is achieved, potential problems can be detected in a timely manner, and accidents can be avoided; in addition, by analyzing a set of feedback signals, the MCU can quickly judge the fault point, helping the operation and maintenance personnel quickly locate the problem and improving the operation and maintenance efficiency; through the automated detection and judgment process, the dependence on manual intervention is reduced, and the intelligent level of the power distribution system is improved.

[0062] In an optional embodiment, determining whether the closing and opening control circuits and the closing and opening pressure plates are in a normal state based on a set of feedback signals includes: when the first feedback signal is at a low level and the third feedback signal is at a low level, it is determined that the connectivity of the closing control circuit is normal, and it is determined that the closing pressure plate is in a normal input state; when the first feedback signal is at a high level and the third feedback signal is at a low level, it is determined that the closing pressure plate is in a normal input state and the connectivity of the closing control circuit is abnormal; when the first feedback signal is at a high level and the third feedback signal is at a high level, it is determined that the closing pressure plate is not in an input state; when the second feedback signal is at a low level and the fourth feedback signal is at a low level, it is determined that the connectivity of the opening control circuit is normal, and it is determined that the opening pressure plate is in a normal input state; when the second feedback signal is at a high level and the fourth feedback signal is at a low level, it is determined that the opening pressure plate is in a normal input state and the connectivity of the opening control circuit is abnormal; when the second feedback signal is at a high level and the fourth feedback signal is at a high level, it is determined that the opening pressure plate is not in an input state.

[0063] In the above embodiment, through the clear level logic relationship, the MCU can accurately judge the specific state of the closing and opening systems, quickly distinguish whether it is a control circuit problem or a pressure plate state problem, and improve the accuracy of fault diagnosis; the MCU can quickly locate the fault point according to the level state of the feedback signal, helping the operation and maintenance personnel quickly determine whether it is a control circuit problem or a pressure plate state problem, and improving the operation and maintenance efficiency. The detection method for the closing and opening control circuits of the distribution terminal can accurately detect the connectivity of the closing and opening control circuits and the state of the pressure plates in real time.

[0064] When the first feedback signal is at a low level and the third feedback signal is at a low level, the MCU determines that the connectivity of the closing control circuit is normal and the closing pressure plate is in a normal input state; when the first feedback signal is at a high level and the third feedback signal is at a low level, the MCU determines that the closing pressure plate is in a normal input state, but the connectivity of the closing control circuit is abnormal; when the first feedback signal is at a high level and the third feedback signal is at a high level, the MCU determines that the closing pressure plate is not in an input state. When the second feedback signal is at a low level and the fourth feedback signal is at a low level, the MCU determines that the connectivity of the opening control circuit is normal and the opening pressure plate is in a normal input state; when the second feedback signal is at a high level and the fourth feedback signal is at a low level, the MCU determines that the opening pressure plate is in a normal input state, but the connectivity of the opening control circuit is abnormal; when the second feedback signal is at a high level and the fourth feedback signal is at a high level, the MCU determines that the opening pressure plate is not in an input state. In practical applications, when the first feedback signal is at a low level and the second feedback signal is at a high level, there may be a problem with the detection circuit (or detection unit) itself; or, when the third feedback signal is at a low level and the fourth feedback signal is at a high level, there may be a problem with the detection circuit (or detection unit) itself.

[0065] In this embodiment, through clear logic rules, the MCU can accurately distinguish between abnormal connectivity of the control loop and the state where the pressure plate is not put in, avoiding misjudgment and missed judgment, and improving the accuracy of judgment; the MCU analyzes the level state of the feedback signal in real time, can detect the abnormal state of the control loop or the pressure plate in time, give an early warning, and avoid the occurrence of accidents; through the logical judgment rules, the MCU can automatically identify and report faults, reduce the dependence on manual intervention, and improve the intelligent level of the power distribution system.

[0066] It should be noted that the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application will be specifically described below with reference to specific embodiments.

[0067] The embodiment of the present application provides a closing and opening loop detection system and method for a power distribution terminal, Figure 3 which is a schematic diagram of a closing and opening loop detection system provided by the embodiment of the present application, including an MCU, a detection circuit and a switching device. Among them, both the MCU and the detection circuit are located in the power distribution terminal, and the detection circuit is used to detect the connectivity of the closing and opening loops and the state of the closing and opening pressure plates.

[0068] The following Figure 3 explains several signals in DXQD: Disconnection detection start signal, output by the MCU; HZDX: Closing loop disconnection signal, input to the MCU; HZYBDX: Closing pressure plate disconnection signal, input to the MCU; FZDX: Tripping loop disconnection signal, input to the MCU; FZYBDX: Tripping pressure plate disconnection signal, input to the MCU.

[0069] Figure 4 which is a schematic diagram of a closing and opening loop detection circuit provided by the embodiment of the present application. The detection circuit of the embodiment of the present application will be described in detail below with reference to this Figure 4 .

[0070] VDD (corresponding to the aforementioned third power supply), VDD1 (corresponding to the aforementioned first power supply), and VDD2 (corresponding to the aforementioned second power supply) must be 3 mutually electrically isolated power supplies. The voltages of VDD1 and VDD2 are lower than the normal closing and opening voltage (generally DC24V) and are set to DC5V to prevent the on-off detection from accidentally triggering the switch action.

[0071] The first resistor R1 and the second resistor R2 are current-limiting resistors. On the one hand, the value of the resistance is adjusted to set the closing loop detection current I t magnitude to ensure that when the loop is conducting, I t is greater than the minimum conduction current I of the optocouplerc (usually about 1 mA): I t = (5 - V ce - V D ) / (R1 + R2 + R x ), V ce is the secondary saturation conduction voltage drop of the first optocoupler U1; V D is the primary conduction voltage drop of the third optocoupler U3; R x is the loop resistance when the closing loop conducts normally, including cable resistance, contact resistance of contacts, switch coil resistance, etc., usually dozens of ohms, and this value will increase when there is poor contact or abnormal components in the loop; Since the voltage of the first power supply VDD1 is selected to be relatively low, the resistance values of the first resistor R1 and the second resistor R2 can be not very large. The change of R x has a significant impact on the magnitude of I t . By reasonably setting the normal magnitude of I t , it can be achieved that when the impedance of the control loop increases abnormally but is not completely disconnected, the increase of Rx causes the actual I t to be less than I c , and then the third optocoupler U3 does not conduct. In this way, not only can the detection of the disconnection of the control loop be realized, but also the detection when the loop is abnormal but not completely disconnected can be realized to a certain extent. When the loop impedance increases abnormally, it will also cause the normal opening and closing of the switch to fail. The design scheme in the related technology only considers the case where the loop is completely disconnected and does not consider the situation of poor contact, etc.

[0072] On the other hand, the first resistor R1 and the second resistor R2 can be used as protection resistors to prevent the closing pressure plate from conducting through the detection loop path due to the failure of components such as the first power supply VDD1. This is necessary because any electronic component may fail. Due to the existence of the detection circuit, there are other redundant paths on the two contacts of the pressure plate. Once the components on the redundant path are short-circuited and fail, it is equivalent to directly short-circuiting the pressure plate contacts, and the function of the pressure plate fails. However, due to the existence of the first resistor R1 and the second resistor R2, the impedance on the redundant path is large, and when the normal opening and closing voltage is applied to it, the current is not enough to drive the switching device (the normal opening and closing current reaches more than 10 A). Therefore, the first resistor R1 and the second resistor R2 are selected as plug-in metal film resistors with high reliability.

[0073] Similarly, the seventh resistor R7 and the eighth resistor R8, the fourth resistor R4 and the fifth resistor R5, and the tenth resistor R10 and the eleventh resistor R11 are all like this.

[0074] Brief introduction to the functions of components: Since the control loop is connected to the primary switchgear, to ensure the reliability of the device, the control loop needs to be electrically isolated from other circuits of the terminal. Therefore, the first optocoupler U1, the second optocoupler U2, the third optocoupler U3, the fourth optocoupler U4, the fifth optocoupler U5, and the sixth optocoupler U6 must all have the function of electrical isolation.

[0075] U1: Output the start signal for loop detection, which is controlled by the MCU to output the DXQD signal (corresponding to the aforementioned pulse test signal) to conduct and transfer the output. U2: Output the start signal for platen detection, which is controlled by the MCU to output the DXQD signal to conduct and transfer the output. U3: Feedback signal for the disconnection of the closing control loop (corresponding to the aforementioned first feedback signal), output the signal HZDX to the MCU. When the level is low, it indicates that the closing control loop is normal; when the level is high, it indicates that the closing control loop is open. U5: Feedback signal for the disconnection of the tripping control loop (corresponding to the aforementioned second feedback signal), output the signal HZDX to the MCU. When the level is low, it indicates that the tripping control loop is normal; when the level is high, it indicates that the tripping control loop is open. U4: Feedback signal for the disconnection of the closing platen (corresponding to the aforementioned third feedback signal), output the signal HZYBDX to the MCU. When the level is low, it indicates that the platen is normal; when the level is high, it indicates that the closing platen is abnormal. U6: Feedback signal for the disconnection of the tripping platen (corresponding to the aforementioned fourth feedback signal), output the signal FZYBDX to the MCU. When the level is low, it indicates that the platen is normal; when the level is high, it indicates that the tripping platen is abnormal. D1 - D4: Ordinary rectifier diodes with a reverse peak voltage not less than 1 kV. The first function is to enhance the voltage withstand ability of the loop because the closing and tripping control loops may be subjected to the impact of lightning surges. The second function is to control the unidirectional transmission of signals to prevent other signals from flowing backward and causing unexpected loop conduction.

[0076] The basic working principle of the detection is as follows: (1) The MCU inside the distribution terminal periodically sends out the pulse signal DXQD; the effective pulse width is less than 1 ms. The reason for choosing the pulse signal instead of continuous conduction is mainly based on two considerations: 1) To further prevent the possibility of the continuous power output from accidentally triggering the switch action. The short - pulse - width signal cannot cause the switch to act. 2) To reduce the power consumption of the entire circuit. (2) The first optocoupler U1 and the second optocoupler U2 conduct, respectively connecting the first power supply VDD1 and the second power supply VDD2 to the subsequent circuits. (3) If the control loops are all connected, the third optocoupler U3, the fourth optocoupler U4, the fifth optocoupler U5, and the sixth optocoupler U6 all conduct, outputting a low - level signal to the MCU; otherwise, they maintain a high - level signal. (4) Within a certain time range after the DXQD signal is sent, the MCU makes a judgment based on the received pulse signal: HZDX is at low level and HZYBDX is at low level: The entire closing control loop is normal; HZDX is at high level and HZYBDX is at low level: The closing pressure plate is normally inserted, but there is an abnormality in the closing control loop; HZDX is at low level and HZYBDX is at high level: There may be an abnormality in the detection circuit; HZDX is at high level and HZYBDX is at high level: The closing pressure plate is not inserted; The detection method of the opening circuit is the same as that of the closing circuit, which will not be elaborated here.

[0077] (5) Based on the detection results, when there is an abnormality, the MCU sends information to the background system to notify the operation and maintenance personnel.

[0078] Figure 5 is a wiring schematic diagram of a closing and opening circuit detection system provided by an embodiment of the present application. Combining Figure 4 with the circuit schematic diagram, it can be seen the connection relationship between the detection circuit and the closing and opening control loop in this embodiment, as shown by the reference numerals HZ+, HZC+ and VDD1- in the figure. It should be noted that Figure 4 mainly shows the schematic diagram of the detection circuit and does not include the complete closing and opening control loop.

[0079] In the embodiment of the present application, the detection of the entire control loop and the hard pressure plate is realized through two groups of independent power supplies and circuits; the use of pulse signal detection can avoid the risk of misoperation of switches.

[0080] Compared with the prior art, the embodiment of the present application has at least the following advantages: 1) It can realize the detection of whether the hard pressure plate is normally inserted alone; 2) It can distinguish whether the abnormality of the control loop occurs in the pressure plate or outside the terminal, which can assist the operation and maintenance personnel to quickly locate the fault location; 3) It can detect the abnormal situation where the loop contact is poor and not completely disconnected; 4) It will not cause the switch to misoperate due to the detection of loop disconnection.

[0081] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present application.

[0082] The present application also provides a computer-readable storage medium, in which instructions are stored, and when the instructions are executed, the method steps described in any one of the above are executed.

[0083] In an exemplary embodiment, the above computer-readable storage medium may include, but is not limited to: various media such as USB flash drives, read-only memories (ROM for short), random access memories (RAM for short), mobile hard disks, magnetic disks, or optical discs that can store computer programs.

[0084] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0085] The above are only exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited thereby. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. Those skilled in the art will readily think of other implementation schemes of the present disclosure after considering the disclosure of the specification.

[0086] The present application aims to cover any variations, uses, or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not recorded in the present disclosure.

Claims

1. A distribution terminal opening and closing control circuit detection device, characterized in that: include: A detection unit, including a closing circuit detection module, an opening circuit detection module, a closing pressure plate state detection module, and an opening pressure plate state detection module; MCU, used for sending a pulse test signal to the detection unit and receiving a set of feedback signals input by the detection unit; The MCU is electrically connected to the closing circuit detection module and the opening circuit detection module respectively through a first optical coupler, and the closing circuit detection module is connected between the first end of the closing pressure plate and the second end of the closing coil, wherein the closing pressure plate is connected in series in the closing control circuit, and the second end of the closing pressure plate is electrically connected to the first end of the closing coil, and the closing circuit detection module is used to detect the connectivity of the closing control circuit and input a first feedback signal to the MCU; the opening circuit detection module is connected between the first end of the opening pressure plate and the second end of the opening coil, wherein the opening pressure plate is connected in series in the opening control circuit, and the second end of the opening pressure plate is electrically connected to the first end of the opening coil, and the opening circuit detection module is used to detect the connectivity of the opening control circuit and input a second feedback signal to the MCU; The MCU is electrically connected to the closing pressure plate state detection module and the opening pressure plate state detection module respectively through the second optical coupler, and the closing pressure plate state detection module is connected in parallel to the two ends of the closing pressure plate, wherein the closing pressure plate state detection module is used to detect the state of the closing pressure plate and input a third feedback signal to the MCU; the opening pressure plate state detection module is connected in parallel to the two ends of the opening pressure plate, wherein the opening pressure plate state detection module is used to detect the state of the opening pressure plate and input a fourth feedback signal to the MCU; The MCU is used to determine whether the status of the opening and closing control circuit and the opening and closing pressure plate is normal based on the set of feedback signals, wherein the set of feedback signals includes the first feedback signal, the second feedback signal, the third feedback signal and the fourth feedback signal, the opening and closing control circuit includes the opening control circuit and the closing control circuit, and the opening and closing pressure plate includes the opening pressure plate and the closing pressure plate.

2. The device according to claim 1, characterized in that The target output terminal of the MCU is electrically connected to the first input terminal of the first optocoupler, the second input terminal of the first optocoupler is electrically connected to the ground terminal, the target output terminal of the MCU is used to output the pulse test signal, the target output terminal of the MCU is also electrically connected to the first input terminal of the second optocoupler, and the second input terminal of the second optocoupler is electrically connected to the ground terminal.

3. The device according to claim 1, characterized in that The closing circuit detection module includes: a third optical coupler, a first diode, a first resistor, a second resistor and a third resistor, wherein: The first output end of the first optocoupler is electrically connected to the positive electrode of the first power supply, the second output end of the first optocoupler is electrically connected to the first input end of the third optocoupler through the first diode, the second input end of the third optocoupler is electrically connected to the first end of the closing pressure plate through the first resistor, the second end of the closing coil is electrically connected to the negative electrode of the first power supply through the second resistor, the first output end of the third optocoupler is electrically connected to the positive electrode of the third power supply through the third resistor, and the second output end of the third optocoupler is electrically connected to the ground end, wherein the first output end of the third optocoupler is used to output the first feedback signal.

4. The device according to claim 3, characterized in that The closing pressure plate state detection module includes: a fourth optical coupler, a second diode, a fourth resistor, a fifth resistor and a sixth resistor, wherein: The first output end of the second optocoupler is electrically connected to the positive electrode of the second power supply, the second output end of the second optocoupler is electrically connected to the first input end of the fourth optocoupler through the second diode, the second input end of the fourth optocoupler is electrically connected to the first end of the closing pressure plate through the fourth resistor, the second end of the closing pressure plate is also electrically connected to the negative electrode of the second power supply through the fifth resistor, the first output end of the fourth optocoupler is electrically connected to the positive electrode of the third power supply through the sixth resistor, and the second output end of the fourth optocoupler is electrically connected to the ground end, wherein the first output end of the fourth optocoupler is used to output the third feedback signal.

5. The device according to claim 1, characterized in that The switch-off circuit detection module includes: a fifth optical coupler, a third diode, a seventh resistor, an eighth resistor and a ninth resistor, wherein: The first output end of the first optocoupler is electrically connected to the positive electrode of the first power supply, the second output end of the first optocoupler is electrically connected to the first input end of the fifth optocoupler through the third diode, the second input end of the fifth optocoupler is electrically connected to the first end of the opening pressure plate through the seventh resistor, the second end of the opening coil is electrically connected to the negative electrode of the first power supply through the eighth resistor, the first output end of the fifth optocoupler is electrically connected to the positive electrode of the third power supply through the ninth resistor, and the second output end of the fifth optocoupler is electrically connected to the ground end, wherein the first output end of the fifth optocoupler is used to output the second feedback signal.

6. The device according to claim 5, characterized in that The switch-off pressure plate state detection module includes: a sixth optical coupler, a fourth diode, a tenth resistor, an eleventh resistor and a twelfth resistor, wherein: The first output end of the second optocoupler is electrically connected to the positive electrode of the second power supply, the second output end of the second optocoupler is electrically connected to the first input end of the sixth optocoupler through the fourth diode, the second input end of the sixth optocoupler is electrically connected to the first end of the gate-opening pressure plate through the tenth resistor, the second end of the gate-opening pressure plate is also electrically connected to the negative electrode of the second power supply through the eleventh resistor, the first output end of the sixth optocoupler is electrically connected to the positive electrode of the third power supply through the twelfth resistor, and the second output end of the sixth optocoupler is electrically connected to the ground end, wherein the first output end of the sixth optocoupler is used to output the fourth feedback signal.

7. The device according to claim 1, characterized in that The MCU is used to determine whether the opening and closing control circuit and the opening and closing pressure plate are normal in the following ways: The MCU determines whether the connectivity of the closing control circuit and the state of the closing pressure plate are normal based on the first feedback signal and the third feedback signal; The MCU determines whether the connectivity of the opening control loop and the state of the opening pressure plate are normal based on the second feedback signal and the fourth feedback signal.

8. The device according to claim 1, characterized in that The MCU makes a judgment based on the set of feedback signals in the following manner: When the first feedback signal is at a low level and the third feedback signal is at a low level, it is determined that the connectivity of the closing control circuit is normal, and it is determined that the closing pressure plate is in a normal input state; When the first feedback signal is at a high level and the third feedback signal is at a low level, it is determined that the closing pressure plate is in a normal state and the connectivity of the closing control circuit is abnormal; When the first feedback signal is at a high level and the third feedback signal is at a high level, it is determined that the closing pressure plate is in a non-activated state; When the second feedback signal is at a low level and the fourth feedback signal is at a low level, it is determined that the connectivity of the opening control circuit is normal, and it is determined that the opening pressure plate is in a normal input state; When the second feedback signal is at a high level and the fourth feedback signal is at a low level, it is determined that the opening pressure plate is in a normal state and the connectivity of the opening control circuit is abnormal; When the second feedback signal is at a high level and the fourth feedback signal is at a high level, it is determined that the opening pressure plate is in a non-activated state.

9. A method for detecting a power distribution terminal opening and closing control circuit, characterized in that: The device according to any one of claims 1 to 8 comprises: Sending a pulse test signal to the detection unit; receiving a set of feedback signals fed back by the detection unit; Based on the set of feedback signals, it is determined whether the opening and closing control circuit and the opening and closing pressure plate are in normal state.

10. The method according to claim 9, characterized in that Judging whether the opening and closing control circuit and the opening and closing pressure plate are in normal state based on the set of feedback signals includes: When the first feedback signal is at a low level and the third feedback signal is at a low level, it is determined that the connectivity of the closing control circuit is normal, and it is determined that the closing pressure plate is in a normal input state; When the first feedback signal is at a high level and the third feedback signal is at a low level, it is determined that the closing pressure plate is in a normal state and the connectivity of the closing control circuit is abnormal; When the first feedback signal is at a high level and the third feedback signal is at a high level, it is determined that the closing pressure plate is in a non-activated state; When the second feedback signal is at a low level and the fourth feedback signal is at a low level, it is determined that the connectivity of the opening control circuit is normal, and it is determined that the opening pressure plate is in a normal input state; When the second feedback signal is at a high level and the fourth feedback signal is at a low level, it is determined that the opening pressure plate is in a normal state and the connectivity of the opening control circuit is abnormal; When the second feedback signal is at a high level and the fourth feedback signal is at a high level, it is determined that the opening pressure plate is in a non-activated state.

Images