A power distribution terminal opening and closing control loop detection device and method

Abstract

The application provides a kind of power distribution terminal opening and closing control loop detection device and method, it is related to electric power technical field, including: detection unit includes opening and closing loop detection module, opening and closing pressboard state detection module;MCU is used to send pulse test signal to detection unit, and receives a group of feedback signals input by detection unit;Closing control loop connectivity is detected by closing loop detection module, and first feedback signal is input to MCU;Opening control loop connectivity is detected by opening loop detection module, and second feedback signal is input to MCU;Closing pressboard state detection module detects closing pressboard state and inputs third feedback signal to MCU;Opening pressboard state detection module detects opening pressboard state and inputs fourth feedback signal to MCU;MCU judges whether opening and closing control loop and opening and closing pressboard state are normal based on a group of feedback signals.The technical scheme of the application is implemented, and the effect of improving the reliability of power distribution system is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power, in particular to a detection device and method for switching control circuit of power distribution terminal. BACKGROUND

[0002] When the distribution network line fails, the power distribution terminal needs to output a control signal to drive the primary switch device to trip. The terminal and the switch are two independent components installed independently, and are connected through a cable in between. Therefore, the control circuit may be disconnected or have poor contact during use, which may cause the switch and the opening failure and further cause an accident. In addition, a hard pressure plate (including a closing pressure plate and an opening pressure plate) is connected in series in the control circuit, which is used to disconnect the circuit during equipment maintenance to prevent the switch from malfunctioning. The power distribution terminal in the related art does not monitor the state of the pressure plate, which brings inconvenience to the operation and maintenance work. Therefore, there is an urgent need for a scheme capable of detecting the connectivity of the switching control circuit and the state of the pressure plate in real time to improve the reliability and operation and maintenance efficiency of the power distribution system. SUMMARY

[0003] The present application aims to overcome the above technical problems, and provides a detection device and method for switching control circuit of power distribution terminal.

[0004] In a first aspect, the application provides a power distribution terminal closing and opening control circuit detection device, 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 group 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, 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, the closing circuit detection module is configured to detect the continuity 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, the opening circuit detection module is configured to detect the continuity 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, the closing pressure plate state detection module is connected in parallel to both 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 to both 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 judge whether the closing and opening control circuits and the closing and opening pressure plates are normal based on the group of feedback signals, wherein the group 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 the closing control circuit and the opening control circuit, and the closing and opening pressure plates include the closing pressure plate and the opening pressure plate.

[0005] By adopting the technical scheme, the closing circuit detection module is connected between the first end of the closing pressure plate and the second end of the closing coil, is used for detecting the connectivity of the closing control circuit, and inputs 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, is used for detecting the connectivity of the opening control circuit, and inputs 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, is used for detecting the state of the closing pressure plate, and inputs a third feedback signal to the MCU, and the opening pressure plate state detection module is connected in parallel to both ends of the opening pressure plate, is used for detecting the state of the opening pressure plate, and inputs a fourth feedback signal to the MCU. The MCU sends a pulse test signal to the detection unit to trigger the detection unit to detect, and receives a group of feedback signals input by the detection unit, and judges whether the closing and opening control circuits and the states of the closing and opening pressure plates are normal according to the group of feedback signals. The device can comprehensively detect the connectivity of the closing and opening control circuits and the states of the pressure plates, can not only judge the connectivity of the circuits by sending a pulse test signal to the detection unit and receiving a group of feedback signals, but also can monitor the states of the closing and opening pressure plates at the same time, thereby effectively avoiding the problem of switch operation failure caused by the opening of the control circuit or poor contact, and the reliability of the power distribution system is improved.

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

[0007] By adopting the technical scheme, the electrical isolation between the MCU and the closing circuit detection module, the opening circuit 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, the influence of the strong electric signal on the MCU is effectively avoided, and the anti-interference ability and the reliability of the system are improved. The target output end of the MCU is electrically connected with the first input end of the first optocoupler, and the pulse test signal is transmitted to the closing circuit detection module and the opening circuit detection module through the first optocoupler, and the target output end is also electrically connected with the first input end 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 in the transmission process, reduces signal attenuation and distortion, and thus ensures the accuracy of the detection result.

[0008] Optionally, the closing loop detection module comprises a third optocoupler, a first diode, a first resistor, a second resistor and a third resistor, wherein 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, and the second output terminal of the third optocoupler is electrically connected to the ground, wherein 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 loop, 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, and the first output terminal of the third optocoupler is used to output a first feedback signal, which reflects the connectivity of the closing control loop and is transmitted to the MCU for further processing.

[0010] Optionally, the closing pressure plate state detection module comprises a fourth optocoupler, a second diode, a fourth resistor, a fifth resistor and a sixth resistor, wherein 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, and the second output terminal of the fourth optocoupler is electrically connected to the ground, wherein 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 realized. Specifically, the circuit structure composed of the fourth optocoupler, the second diode and the related resistors can accurately determine whether the closing pressure plate is normally put into operation or whether there is a situation of not being put into operation under different voltage levels. This design scheme improves the overall reliability of the closing and opening control loop in the power distribution system, and provides clear state indication for the operation and maintenance personnel, thereby improving the maintenance efficiency and safety of the system.

[0012] Optionally, the closing circuit detection module comprises a fifth optocoupler, 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 pole 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 closing pressure plate through the seventh resistor, the second end of the closing coil is electrically connected to the negative pole of the first power supply through the eighth resistor, the first output end of the fifth optocoupler is electrically connected to the positive pole of the third power supply through the ninth resistor, and the second output end of the fifth optocoupler is electrically connected to the ground, wherein the first output end of the fifth optocoupler is used for outputting a second feedback signal.

[0013] By adopting the above technical solution, the fifth optocoupler is used for detecting the connectivity of the closing control circuit, the second input end of the fifth optocoupler is connected to the first end of the closing pressure plate through the seventh resistor, the first output end of the fifth optocoupler is connected to the positive pole of the third power supply through the ninth resistor, and the second output end of the fifth optocoupler is grounded; the third diode is connected between the second output end of the first optocoupler and the first input end of the fifth optocoupler, used for preventing reverse current and protecting the fifth optocoupler; the seventh resistor is connected between the second input end of the fifth optocoupler and the first end of the closing pressure plate, used for limiting current and ensuring that the input end current of the fifth optocoupler is within a safe range; the eighth resistor is connected between the second end of the closing coil and the negative pole of the first power supply, used for limiting current and protecting the closing coil; the ninth resistor is connected between the first output end of the fifth optocoupler and the positive pole of the third power supply, used for limiting current and ensuring that the output end current of the fifth optocoupler is within a safe range; and the first output end of the fifth optocoupler is used for outputting a second feedback signal, which reflects the connectivity of the closing control circuit and is transmitted to the MCU for further processing.

[0014] Optionally, the closing pressure plate state detection module comprises a sixth optocoupler, 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 pole 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 closing pressure plate through the tenth resistor, the second end of the closing pressure plate is also electrically connected to the negative pole of the second power supply through the eleventh resistor, the first output end of the sixth optocoupler is electrically connected to the positive pole of the third power supply through the twelfth resistor, and the second output end of the sixth optocoupler is electrically connected to the ground, wherein the first output end of the sixth optocoupler is used for outputting a fourth feedback signal.

[0015] By adopting the above technical scheme, the sixth optocoupler is used for detecting the state of the disconnecting pressure plate, the second input end of the sixth optocoupler is connected with the first end of the disconnecting pressure plate through the tenth resistor, the first output end of the sixth optocoupler is connected with the positive pole 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 for preventing reverse current and protecting the sixth optocoupler; the tenth resistor is connected between the second input end of the sixth optocoupler and the first end of the disconnecting pressure plate, and is used for limiting current and ensuring that the input end current of the sixth optocoupler is within a safe range; the eleventh resistor is connected between the second end of the disconnecting pressure plate and the negative pole of the second power supply, and is used for limiting current and protecting the disconnecting pressure plate; the twelfth resistor is connected between the first output end of the sixth optocoupler and the positive pole of the third power supply, and is used for limiting current and ensuring that the output end current of the sixth optocoupler is within a safe range; and the first output end of the sixth optocoupler is used for outputting the fourth feedback signal, which reflects the state of the disconnecting pressure plate and is transmitted to the MCU for further processing. Through the precise control of the sixth optocoupler and the resistor, the detection result of the disconnecting pressure plate state is ensured to be accurate and reliable, and the detection precision of the system is improved; the combination of the fourth diode and the resistor effectively prevents reverse current and overcurrent, protects the detection module and the disconnecting pressure plate, and prolongs the service life of the equipment; and the use of the sixth optocoupler realizes the electrical isolation of the detection signal and the high-voltage loop, prevents interference in the signal transmission process, and improves the anti-interference ability of the system.

[0016] Optionally, the MCU is used for judging whether the closing and opening control circuits and the closing and opening pressure plates are normal by 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; and 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.

[0017] By adopting the above technical scheme, based on the cooperation of the first feedback signal and the third feedback signal, whether the connectivity of the closing control circuit and the state of the closing pressure plate are normal can be accurately judged, thereby effectively avoiding the problem of switch operation failure caused by abnormal closing circuit or incorrect setting of the closing pressure plate; based on the cooperation of the second feedback signal and the fourth feedback signal, whether the connectivity of the opening control circuit and the state of the opening pressure plate are normal can be accurately evaluated, thereby further improving the system operation reliability and reducing the safety hidden danger caused by opening circuit fault or incorrect setting of the opening pressure plate. Overall, the technical scheme significantly improves the monitoring ability and operation efficiency of the power distribution system, and ensures the safe and stable operation of the power equipment. The MCU not only monitors the connectivity of the control circuit, but also monitors the state of the pressure plate, thereby realizing the comprehensive monitoring of the closing and opening control circuits and the pressure plate state, and improving the reliability of the system.

[0018] Optionally, the MCU judges based on the set of feedback signals in the following manner: when the first feedback signal is low and the third feedback signal is low, it is judged that the continuity 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 high and the third feedback signal is low, it is judged that the closing pressure plate is in a normal input state and that the continuity of the closing control loop is abnormal; when the first feedback signal is high and the third feedback signal is high, it is judged that the closing pressure plate is in an uninput state; when the second feedback signal is low and the fourth feedback signal is low, it is judged that the continuity 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 high and the fourth feedback signal is low, it is judged that the opening pressure plate is in a normal input state and that the continuity of the opening control loop is abnormal; when the second feedback signal is high and the fourth feedback signal is high, it is judged that the opening pressure plate is in an uninput state.

[0019] By adopting the technical solutions described above, through the explicit level logic relationship, the MCU can accurately judge the specific state of the closing and opening system, 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, help the operation and maintenance personnel quickly determine whether it is a control loop problem or a pressure plate state problem, and improve the operation and maintenance efficiency.

[0020] In the second aspect of the present application, a power distribution terminal closing and opening control loop detection method is also provided, which is applied to the power distribution terminal closing and opening control loop detection device of any one of the preceding aspects, 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 closing and opening control loop and the closing and opening pressure plate state are normal based on the set of feedback signals.

[0021] Optionally, judging whether the closing and opening control loop and the closing and opening press plate state are normal based on a set of feedback signals, comprising: when the first feedback signal is low and the third feedback signal is low, judging that the connectivity of the closing control loop is normal, and judging that the closing press plate is in the normal input state; when the first feedback signal is high and the third feedback signal is low, judging that the closing press plate is in the normal input state and the connectivity of the closing control loop is abnormal; when the first feedback signal is high and the third feedback signal is high, judging that the closing press plate is in the non-input state; when the second feedback signal is low and the fourth feedback signal is low, judging that the connectivity of the opening control loop is normal, and judging that the opening press plate is in the normal input state; when the second feedback signal is high and the fourth feedback signal is low, judging that the opening press plate is in the normal input state and the connectivity of the opening control loop is abnormal; when the second feedback signal is high and the fourth feedback signal is high, judging that the opening press plate is in the non-input state.

[0022] In the third aspect of the present application, an electronic device is further provided, comprising a memory and a processor, the memory stores a computer program, and the processor implements the method steps of any one of the above when executing the program.

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

[0024] In summary, the one or more technical solutions provided in the present application have at least the following technical effects or advantages:

[0025] 1. A device capable of comprehensively detecting the connectivity of the closing and opening control loop of the power distribution terminal and the state of the press plate is realized, which can not only send pulse test signals to the detection unit through the MCU and receive a set of feedback signals to judge the loop connectivity, but also can monitor the state of the closing press plate and the opening press plate at the same time, thereby effectively avoiding the problem of switch operation failure caused by the opening and closing of the control loop or poor contact, and achieving the effect of improving the reliability of the power distribution system;

[0026] 2. The electrical isolation between the MCU and the closing loop detection module, the opening loop detection module, the closing press plate state detection module and the opening press plate state detection module is realized through the first optocoupler and the second optocoupler, which effectively avoids the influence of strong electric signals on the MCU and improves the anti-interference ability and reliability of the system;

[0027] 3. The device can accurately determine whether the closing pressure plate is normally put into or whether there is an unput situation under different level states, improve the overall reliability of the closing and opening control circuit in the power distribution system, and provide clear state indication for the operation and maintenance personnel, thereby improving the maintenance efficiency and safety of the system;

[0028] 4. The device significantly improves the monitoring ability and operation and maintenance efficiency of the power distribution system, and ensures the safe and stable operation of the power equipment;

[0029] 5. Through the clear level logic relationship, the MCU can accurately determine the specific state of the closing and opening system, 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, help the operation and maintenance personnel quickly determine whether it is a control circuit problem or a pressure plate state problem, and improve the operation and maintenance efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a framework diagram of a power distribution terminal closing and opening control circuit detection device provided by the embodiment of the present application;

[0031] Figure 2 is a flow chart of a power distribution terminal closing and opening control circuit detection method provided by the embodiment of the present application;

[0032] Figure 3 is a schematic diagram of a closing and opening circuit detection system provided by the embodiment of the present application;

[0033] Figure 4 is a schematic diagram of a closing and opening circuit detection circuit provided by the embodiment of the present application;

[0034] Figure 5 is a wiring schematic diagram of a closing and opening circuit detection system provided by the embodiment of the present application.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 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

[0037] In order for those skilled in the art to better understand the technical solutions in the specification, the technical solutions in the specification will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the specification. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0038] In the description of the embodiments of the present application, the words such as "for example" or "for instance" are used to represent an example, illustration or description. Any embodiment or design scheme described as "for example" or "for instance" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words such as "for example" or "for instance" are intended to present the relevant concept in a specific manner.

[0039] In the description of the embodiments of the present application, the term "a plurality of" means two or more. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. The terms "include", "contain", "have" and their variants mean "include but are not limited to", unless otherwise specifically emphasized.

[0040] The present application provides a power distribution terminal opening and closing control circuit detection device, referring to Figure 1 , Figure 1A framework of a power distribution terminal closing and opening control circuit detection device is provided, and the device comprises: a detection unit comprising 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 for sending a pulse test signal to the detection unit and receiving a group of feedback signals input by the detection unit; the MCU is electrically connected with the closing circuit detection module and the opening circuit detection module through a first optocoupler, the closing circuit detection module is connected between a first end of a closing pressure plate and a second end of a closing coil, wherein the closing pressure plate is connected in series in a closing control circuit, a second end of the closing pressure plate is electrically connected with a first end of the closing coil, the closing circuit detection module is used for detecting the continuity of the closing control circuit and inputting a first feedback signal to the MCU; the opening circuit detection module is connected between a first end of an opening pressure plate and a second end of an opening coil, wherein the opening pressure plate is connected in series in an opening control circuit, a second end of the opening pressure plate is electrically connected with a first end of the opening coil, the opening circuit detection module is used for detecting the continuity of the opening control circuit and inputting a second feedback signal to the MCU; the MCU is electrically connected with the closing pressure plate state detection module and the opening pressure plate state detection module through a second optocoupler, the closing pressure plate state detection module is connected in parallel at both ends of the closing pressure plate, wherein the closing pressure plate state detection module is used for detecting the state of the closing pressure plate and inputting 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, wherein the opening pressure plate state detection module is used for detecting the state of the opening pressure plate and inputting a fourth feedback signal to the MCU; the MCU is used for judging whether the closing and opening control circuits and the closing and opening pressure plates are normal based on the group of feedback signals, wherein the group of feedback signals comprises the first feedback signal, the second feedback signal, the third feedback signal and the fourth feedback signal, the closing and opening control circuits comprise the closing control circuit and the opening control circuit, and the closing and opening pressure plates comprise the closing pressure plate and the opening pressure plate.

[0041] In the above embodiment, the closing circuit detection module is connected between the first end of the closing pressure plate and the second end of the closing coil, for detecting the continuity of the closing control circuit and inputting 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, for detecting the continuity of the opening control circuit and inputting a second feedback signal to the MCU, the closing pressure plate state detection module is connected in parallel to the two ends of the closing pressure plate, for detecting the state of the closing pressure plate and inputting a third feedback signal to the MCU, and the opening pressure plate state detection module is connected in parallel to the two ends of the opening pressure plate, for detecting the state of the opening pressure plate and inputting a fourth feedback signal to the MCU. The MCU sends a pulse test signal to the detection unit to trigger the detection unit to detect, and receives a group of feedback signals input by the detection unit, and judges whether the closing and opening control circuits and the states of the closing and opening pressure plates are normal according to the group of feedback signals. A device capable of comprehensively detecting the continuity of the closing and opening control circuits and the states of the pressure plates of the power distribution terminal is realized. The device can not only judge the continuity of the circuit by sending a pulse test signal to the detection unit and receiving a group of feedback signals by the MCU, but also can monitor the states of the closing and opening pressure plates at the same time, so as to effectively avoid the problem of switch operation failure caused by the opening of the control circuit or poor contact, and improve the reliability of the power distribution system.

[0042] In the related art, the power distribution terminal design does not monitor the connectivity of the closing and opening control circuit in real time, which leads to the failure to discover and handle in time when the control circuit is disconnected or in poor contact, which may cause switch and opening failure and further cause accidents. In the related art, the state of the hard pressure plate (closing pressure plate and opening pressure plate) is not monitored, and the state of the pressure plate cannot be known in real time during equipment maintenance, which increases 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 plate, the operation and maintenance personnel need to manually check and troubleshoot the fault, which is low in efficiency and prone to errors. The detection unit of the 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, which are respectively responsible for detecting the connectivity of the closing control circuit and the opening control circuit, and the state of the closing pressure plate and the opening pressure plate. The MCU sends a pulse test signal to the detection unit and receives a feedback signal returned by the detection unit. By analyzing the feedback signals, the MCU can determine whether the closing and opening control circuits and the pressure plate state are normal. The MCU is connected to each detection module through an optocoupler, which ensures electrical isolation and improves the safety and anti-interference ability of the system. The feedback signals received by the MCU include a first feedback signal of the closing circuit detection module, a second feedback signal of the opening circuit detection module, a third feedback signal of the closing pressure plate state detection module and a fourth feedback signal of the opening pressure plate state detection module. Through these signals, the MCU can comprehensively understand the state of the control circuit and the pressure plate. Through the embodiment, by monitoring the connectivity of the closing and opening control circuits and the state of the pressure plate in real time, the circuit fault can be discovered and handled in time, the switch and opening failure can be avoided, and the possibility of accidents can be reduced. The operation and maintenance personnel can obtain the state information of the control circuit and the pressure plate in real time through the MCU, without the need for manual inspection, which greatly improves the operation and maintenance efficiency and reduces the error rate of manual operation. Through optical coupling isolation and real-time monitoring, the system can effectively prevent misoperation and electrical interference, and improve the overall safety of the power distribution system. Real-time monitoring of the pressure plate state enables quick judgment of whether the pressure plate is in the correct state during equipment maintenance, simplifies the maintenance process and reduces the maintenance risk.

[0043] In an optional embodiment, the target output end of the MCU is electrically connected with the first input end of the first optocoupler U1, the second input end of the first optocoupler U1 is electrically connected with the ground end, the target output end of the MCU is used to output the pulse test signal, and the target output end of the MCU is also electrically connected with the first input end of the second optocoupler U2, and the second input end of the second optocoupler U2 is electrically connected with the ground end.

[0044] In the above embodiment, as shown in Figure 4 the first optocoupler U1 is connected with the MCU through the thirteenth resistor R13, Figure 4 the MCU is not shown in the above embodiment, and can be referred to Figure 3, the second optocoupler U2 is connected to the MCU through the fourteenth resistor R14, and the 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 achieved through the first optocoupler U1 and the second optocoupler U2, 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 end of the MCU is electrically connected to the first input end 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 end is also electrically connected to the first input end of the second optocoupler U2, 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 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.

[0045] The 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 strong electrical circuits on the MCU, protecting the MCU from high-voltage impact and electromagnetic interference. The first optocoupler U1 is used to connect the MCU with the closing loop detection module and the opening loop detection module. The target output end of the MCU (i.e., the output end of the pulse test signal) is connected to the first input end of the first optocoupler U1, while the second input end 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 with the closing pressure plate state detection module and the opening pressure plate state detection module. Similarly, the target output end of the MCU is also connected to the first input end of the second optocoupler U2, and the second input end of the second optocoupler U2 is grounded, allowing the MCU to transmit the pulse test signal to the closing and opening pressure plate state detection modules through the second optocoupler U2. In a power distribution system, there is a potential difference between the high-voltage side and the low-voltage side, and direct connection may cause signal interference or even damage to the equipment. Using an optocoupler to achieve electrical isolation can effectively avoid these problems. This embodiment uses an optocoupler to achieve electrical isolation, improving the reliability and stability of signal transmission and reducing the risk of misoperation caused by electrical interference. The optocoupler not only provides electrical isolation but also protects the MCU from potential damage from the high-voltage side, enhancing the safety of the entire system. By connecting the target output end of the MCU to both the first optocoupler U1 and the second optocoupler U2, the circuit structure is simplified, the system complexity is reduced, and maintenance and debugging are facilitated.

[0046] In an alternative embodiment, as shown in FIG. 6, the MCU is connected to the closing loop detection module and the opening loop detection module through the first optocoupler U1, and the MCU is connected to the closing pressure plate state detection module and the opening pressure plate state detection module through the second optocoupler U2. In this embodiment, the target output end of the MCU is electrically connected to the first input end 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 end of the MCU is also electrically connected to the first input end of the second optocoupler U2, 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 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. Figure 4As shown, the closing circuit detection module includes: a third optocoupler U3, a first diode D1, a first resistor R1, a second resistor R2, and a third resistor R3. The first output terminal of the first optocoupler U1 is electrically connected to the positive terminal 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 terminal 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 terminal of the third power supply through the third resistor R3. 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.

[0047] 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, and the first output terminal of the third optocoupler U3 is connected to the third power supply (such as...) through the third resistor R3. Figure 4 The positive terminal of the third optocoupler U3 is connected to VDD, the second output terminal of the third optocoupler U3 is grounded, and 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.

[0048] 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 connected to the positive terminal of the first power supply (e.g., Figure 4 The first optocoupler U1 is electrically connected to the VDD1+ of the first optocoupler U1 via the first diode D1, and the second output terminal of the first optocoupler U3 is electrically connected to the first input terminal of the third optocoupler U3 via the first diode D1. The third optocoupler U3, as a key component for signal isolation and transmission, has its second input terminal electrically connected to the first end of the closing pressure plate via the first resistor R1, and its second end connected to the negative terminal of the first power supply via the second resistor R2. Figure 4VDD1-)is electrically connected; the first output end of the third optocoupler U3 is electrically connected to the positive pole of the third power supply through the third resistor R3, and the second output end of the third optocoupler U3 is electrically connected to the ground. The first output end of the third optocoupler U3 is used to output a first feedback signal, which represents the connectivity state of the closing control circuit. When the MCU sends a pulse test signal through the first optocoupler U1, the signal is transmitted to the first input end of the third optocoupler U3 through the first diode D1. If the closing control circuit (including the closing pressure plate and the closing coil) is connected, the pulse signal can be transmitted to the second input end 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 end of the third optocoupler U3 outputs the first feedback signal, indicating that the connectivity of the closing control circuit is normal. If the circuit is disconnected or the contact is poor, the third optocoupler U3 will not conduct, and the first feedback signal will indicate an abnormal state. In this embodiment, the combination of the optocoupler and the resistor realizes accurate detection of the connectivity of the closing control circuit. The signal isolation function of the optocoupler ensures the stability and accuracy of the detection signal, and can effectively distinguish between normal and abnormal states of the circuit. The first output end of the third optocoupler U3 can output the first feedback signal, which transmits the connectivity state of the closing control circuit to the MCU in real time. This real-time feedback mechanism enables the maintenance personnel to promptly understand the circuit state and facilitate quick action.

[0049] The second input end 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 circuit. When the closing control circuit is conducting, the third optocoupler U3 will receive sufficient current to output a low-level first feedback signal, indicating that the closing control circuit is normally conducting. Conversely, if the closing control circuit is disconnected or the contact is poor, the third optocoupler U3 will not receive sufficient current and will output a high-level first feedback signal, indicating that the closing control circuit has an abnormality. Through precise control of the third optocoupler U3 and the resistor, the detection result of the closing control circuit is accurate and reliable, improving the detection accuracy of the system. By introducing the first diode D1 and appropriate resistor configuration, reverse current and overcurrent are effectively prevented, protecting the detection module and the closing coil, prolonging the service life of the equipment, ensuring that the circuit can work stably under different working conditions, and improving the accuracy and reliability of the detection. The above-mentioned first power supply can be 5V (or other voltage), and the third power supply can be 3.3V (or other voltage).

[0050] In an alternative embodiment, as Figure 4As shown, the closing pressure plate status detection module includes: a fourth optocoupler U4, a second diode D2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first output terminal of the second optocoupler U2 is electrically connected to the positive terminal 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 via the second diode D2. The second input terminal of the fourth optocoupler U4 is electrically connected to the first terminal of the closing pressure plate via the fourth resistor R4. The second terminal of the closing pressure plate is also electrically connected to the negative terminal of the second power supply via the fifth resistor R5. The first output terminal of the fourth optocoupler U4 is electrically connected to the positive terminal of the third power supply via the sixth resistor R6. The second output terminal of the fourth optocoupler U4 is electrically connected to the ground terminal. The first output terminal of the fourth optocoupler U4 is used to output a third feedback signal.

[0051] In the above embodiments, accurate detection of the closing switch status is achieved. Specifically, by utilizing the circuit structure composed of the fourth optocoupler U4, the second diode D2, and related resistors, it is possible to accurately determine whether the closing switch is properly engaged or not engaged under different voltage levels. This design improves the overall reliability of the opening and closing control circuit in the power distribution system, while providing clear status indications for maintenance personnel, thereby enhancing the system's maintenance efficiency and safety.

[0052] The MCU sends a pulse test signal to the closing pressure plate status detection module through the second optocoupler U2. The first output terminal of the second optocoupler U2 is connected to the positive terminal of the second power supply (e.g., Figure 4 The second output terminal is electrically connected to the first input terminal of the fourth optocoupler U4 via the second diode D2. The fourth optocoupler U4 serves as a key component for signal isolation and transmission. The second input terminal of the fourth optocoupler U4 is electrically connected to the first terminal of the closing pressure plate via the fourth resistor R4. The second terminal of the closing pressure plate is connected to the negative terminal of the second power supply (e.g., VDD2+) via the fifth resistor R5. Figure 4The first output terminal of the fourth optocoupler U4 is electrically connected to the positive terminal of the third power supply via the sixth resistor R6, and the second output terminal of the fourth optocoupler U4 is electrically connected to the ground terminal. 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 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 fourth optocoupler U4 through the closing 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 plate is in a normal state. If the plate is in the disengaged state (i.e., the circuit is disconnected), the fourth optocoupler U4 will not conduct, and the third feedback signal will indicate an abnormality, i.e., the closing plate is not in the engaged state. The second diode D2 prevents reverse current flow and ensures that the pulse test signal is correctly transmitted to the fourth optocoupler U4. The fourth resistor R4 and the fifth resistor R5 are used for current limiting to ensure stable operation of the circuit under different operating conditions. The second power supply can be 5V (or other voltage). This embodiment uses a combination of optocouplers and resistors to achieve real-time monitoring of the closing pressure plate status. The MCU can promptly understand the engagement or disengagement status of the pressure plate based on the third feedback signal, facilitating quick action.

[0053] In an optional embodiment, such as Figure 4 As shown, the tripping 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. The first output terminal of the first optocoupler U1 is electrically connected to the positive terminal 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 via the third diode D3. The second input terminal of the fifth optocoupler U5 is electrically connected to the first end of the tripping pressure plate via the seventh resistor R7. The second end of the tripping coil is electrically connected to the negative terminal of the first power supply via the eighth resistor R8. The first output terminal of the fifth optocoupler U5 is electrically connected to the positive terminal of the third power supply via 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.

[0054] In the above embodiment, the fifth optocoupler U5 is used to detect the connectivity of the tripping control circuit. The second input terminal of the fifth optocoupler U5 is connected to the first end of the tripping 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...) through the ninth resistor R9. Figure 4The positive terminal of the first optocoupler U1 (VDD) is connected to the ground, 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 terminal of the tripping plate to limit 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 terminal of the tripping coil and the negative terminal of the first power supply to limit current and protect the tripping coil. The ninth resistor R9 is connected between the first output terminal of the fifth optocoupler U5 and the positive terminal of the third power supply to limit 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 the second feedback signal, which reflects the continuity of the tripping control loop and is transmitted to the MCU for further processing. This 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 capability of the system.

[0055] The MCU sends a pulse test signal to the tripping circuit detection module through the first optocoupler U1. The first output end of the first optocoupler U1 is electrically connected to the positive pole of the first power supply. The second output end of the first optocoupler U1 is electrically connected to the first input end of the fifth optocoupler U5 through the third diode D3. The fifth optocoupler U5 is a key element for signal isolation and transmission. The second input end of the fifth optocoupler U5 is electrically connected to the first end of the tripping pressure plate through the seventh resistor R7. The second end of the tripping coil is electrically connected to the negative pole of the first power supply through the eighth resistor R8. The first output end 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 end of the fifth optocoupler U5 is electrically connected to the ground. The first output end of the fifth optocoupler U5 is used to output a second feedback signal, indicating the connectivity state of the tripping control circuit. When the MCU sends a pulse test signal through the first optocoupler U1, the signal is transmitted to the first input end of the fifth optocoupler U5 through the third diode D3. If the tripping control circuit (including the tripping pressure plate and the tripping coil) is connected, the pulse signal can be transmitted to the second input end of the fifth optocoupler U5 through the tripping pressure plate and the tripping coil, triggering the fifth optocoupler U5 to conduct. After the fifth optocoupler U5 conducts, the first output end of the fifth optocoupler U5 outputs a second feedback signal, indicating that the connectivity of the tripping control circuit is normal. If the circuit is disconnected or the contact is poor, the fifth optocoupler U5 will not conduct, and the second feedback signal will indicate an abnormality. In this embodiment, the combination of the optocoupler and the resistor realizes accurate detection of the connectivity of the tripping control circuit. The signal isolation function of the optocoupler ensures the stability and accuracy of the detection signal, and can effectively distinguish between normal and abnormal states of the circuit. The first output end of the fifth optocoupler U5 can output a second feedback signal, which transmits the connectivity state of the tripping control circuit to the MCU in real time. This real-time feedback mechanism enables maintenance personnel to promptly understand the circuit state and facilitate quick action. The combination of the third diode D3 and the resistor effectively prevents reverse current and overcurrent, protecting the detection module and the tripping coil and prolonging the service life of the equipment. The use of the fifth optocoupler U5 realizes electrical isolation of the detection signal and the high-voltage circuit, preventing interference during signal transmission and improving the anti-interference ability of the system.

[0056] In an alternative embodiment, as Figure 4As shown, the closing pressure plate state detection module comprises a sixth optocoupler U6, a fourth diode D4, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12. The first output end of the second optocoupler U2 is electrically connected to the positive pole of the second power supply, the second output end of the second optocoupler U2 is electrically connected to the first input end of the sixth optocoupler U6 through the fourth diode D4, the second input end of the sixth optocoupler U6 is electrically connected to the first end of the closing pressure plate through the tenth resistor R10, the second end of the closing pressure plate is also electrically connected to the negative pole of the second power supply through the eleventh resistor R11, the first output end 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 end of the sixth optocoupler U6 is electrically connected to the ground. The first output end of the sixth optocoupler U6 is used to output a fourth feedback signal.

[0057] In the above embodiment, the sixth optocoupler U6 is used to detect the state of the closing pressure plate, the second input end of the sixth optocoupler U6 is connected to the first end of the closing pressure plate through the tenth resistor R10, the first output end 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 end of the sixth optocoupler U6 is grounded; the fourth diode D4 is connected between the second output end of the second optocoupler U2 and the first input end of the sixth optocoupler U6, used to prevent reverse current and protect the sixth optocoupler U6; the tenth resistor R10 is connected between the second input end of the sixth optocoupler U6 and the first end of the closing pressure plate, used to limit current and ensure that the input end current of the sixth optocoupler U6 is within a safe range; the eleventh resistor R11 is connected between the second end of the closing pressure plate and the negative pole of the second power supply, used to limit current and protect the closing pressure plate; the twelfth resistor R12 is connected between the first output end of the sixth optocoupler U6 and the positive pole of the third power supply, used to limit current and ensure that the output end current of the sixth optocoupler U6 is within a safe range; and the first output end of the sixth optocoupler U6 is used to output a fourth feedback signal, which reflects the state of the closing pressure plate and is transmitted to the MCU for further processing. Through the precise control of the sixth optocoupler U6 and the resistors, the detection result of the closing pressure plate state is ensured to be accurate and reliable, and the detection accuracy of the system is improved; the combination of the fourth diode D4 and the resistors effectively prevents reverse current and overcurrent, protects the detection module and the closing pressure plate, and prolongs the service life of the equipment; and the use of the sixth optocoupler U6 realizes the electrical isolation of the detection signal and the high-voltage loop, prevents interference in the signal transmission process, and improves the anti-interference ability of the system.

[0058] The MCU sends a pulse test signal to the disconnecting pressure plate state detection module through the second optocoupler U2. The first output end of the second optocoupler U2 is electrically connected to the positive pole of the second power supply. The second output end of the second optocoupler U2 is electrically connected to the first input end of the sixth optocoupler U6 through the fourth diode D4. The sixth optocoupler U6 is a key element for signal isolation and transmission. The second input end of the sixth optocoupler U6 is electrically connected to the first end of the disconnecting pressure plate through the tenth resistor R10. The second end of the disconnecting pressure plate is electrically connected to the negative pole of the second power supply through the eleventh resistor R11. The first output end 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 end of the sixth optocoupler U6 is electrically connected to the ground. The first output end of the sixth optocoupler U6 is used to output a fourth feedback signal, indicating the state of the disconnecting pressure plate. When the MCU sends a pulse test signal through the second optocoupler U2, the signal is transmitted to the first input end of the sixth optocoupler U6 through the fourth diode D4. If the disconnecting pressure plate is in the input state (i.e., the circuit is connected), the pulse signal can be transmitted to the second input end of the sixth optocoupler U6 through the disconnecting pressure plate, triggering the sixth optocoupler U6 to conduct. After the sixth optocoupler U6 conducts, the first output end of the sixth optocoupler U6 outputs the fourth feedback signal, indicating that the state of the disconnecting pressure plate is normal. If the pressure plate is in the exit 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, the combination of optocouplers and resistors realizes real-time monitoring of the state of the disconnecting pressure plate. The MCU can timely understand the input or exit state of the pressure plate according to the fourth feedback signal, facilitating quick measures. The electrical isolation of the optocoupler can effectively prevent high-voltage signals from interfering with the detection circuit, ensuring the stability and reliability of the detection signal. By monitoring the state of the disconnecting pressure plate in real time, the operator can timely discover potential problems and handle them, reducing troubleshooting time and improving work efficiency.

[0059] In an optional embodiment, the MCU is configured to determine whether the closing and opening control circuits and the closing and opening pressure plates are normal by: determining, based on the first feedback signal and the third feedback signal, whether the closing control circuit and the closing pressure plate are normal; and determining, based on the second feedback signal and the fourth feedback signal, whether the opening control circuit and the opening pressure plate are normal.

[0060] In the above embodiment, based on the cooperation of the first feedback signal and the third feedback signal, it can be accurately judged whether the closing control loop is connected and whether the state of the closing pressure plate is normal, thereby effectively avoiding the problem of switch operation failure caused by abnormal closing loop or incorrect input of 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 whether the state of the opening pressure plate is normal can be accurately evaluated, thereby further improving the system operation reliability and reducing the safety hazards caused by opening loop failure or incorrect setting of opening pressure plate. Overall, the present embodiment significantly improves the monitoring capability and operation efficiency of the power distribution system, and ensures the safe and stable operation of the power equipment. The MCU not only monitors the connectivity of the control loop, but also monitors the state of the pressure plate, thereby realizing comprehensive monitoring of the closing and opening control loops and the state of the pressure plate, and improving the reliability of the system.

[0061] 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 closing control loop connectivity is normal, and the third feedback signal indicates that the closing pressure plate state is normal, the MCU judges that the overall state of the closing control loop and the closing pressure plate is normal. If any 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 opening control loop connectivity is normal, and the fourth feedback signal indicates that the opening pressure plate state is normal, the MCU judges that the overall state of the opening control loop and the opening pressure plate is normal. If any 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 the present embodiment, the MCU can comprehensively evaluate the closing and opening control loops and the state of the pressure plate by comprehensively analyzing the first, second, third and fourth feedback signals, and provide more accurate system state information. Through the clear judgment logic, the MCU can quickly distinguish whether the problem is the control loop or the pressure plate state, help the operation and maintenance personnel to quickly locate the fault point, and reduce the troubleshooting time. The MCU can receive feedback signals in real time and make judgments, discover abnormal states in time and issue warnings, so that the operation and maintenance personnel can quickly take measures to avoid the expansion of faults. By providing accurate fault diagnosis information, the on-site inspection workload of the operation and maintenance personnel is reduced, the operation and maintenance cost is reduced, and the operation and maintenance efficiency is improved. Without comprehensive judgment of the control loop and the pressure plate state, the operation and maintenance personnel cannot quickly locate the fault point, which increases the operation and maintenance difficulty and time cost. The related technology lacks real-time monitoring of the control loop and the pressure plate state, which leads to the inability to discover potential problems in time and increases the risk of system operation.

[0062] In an optional embodiment, the MCU judges based on a set of feedback signals in the following way: when the first feedback signal is low and the third feedback signal is low, it is judged that the continuity of the closing control loop is normal and that the closing pressure plate is in the normal input state; when the first feedback signal is high and the third feedback signal is low, it is judged that the closing pressure plate is in the normal input state and that the continuity of the closing control loop is abnormal; when the first feedback signal is high and the third feedback signal is high, it is judged that the closing pressure plate is in the non-input state; when the second feedback signal is low and the fourth feedback signal is low, it is judged that the continuity of the opening control loop is normal and that the opening pressure plate is in the normal input state; when the second feedback signal is high and the fourth feedback signal is low, it is judged that the opening pressure plate is in the normal input state and that the continuity of the opening control loop is abnormal; when the second feedback signal is high and the fourth feedback signal is high, it is judged that the opening pressure plate is in the non-input state.

[0063] In the above embodiment, through the explicit level logic relationship, the MCU can accurately judge the specific state of the closing and opening system, 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, help the operation and maintenance personnel quickly determine whether it is a control loop problem or a pressure plate state problem, and improve the operation and maintenance efficiency.

[0064] When the first feedback signal is low and the third feedback signal is low, the MCU judges that the continuity of the closing control loop is normal and that the closing pressure plate is in the normal input state; when the first feedback signal is high and the third feedback signal is low, the MCU judges that the closing pressure plate is in the normal input state, but the continuity of the closing control loop is abnormal; when the first feedback signal is high and the third feedback signal is high, the MCU judges that the closing pressure plate is in the non-input state. When the second feedback signal is low and the fourth feedback signal is low, the MCU judges that the continuity of the opening control loop is normal and that the opening pressure plate is in the normal input state; when the second feedback signal is high and the fourth feedback signal is low, the MCU judges that the opening pressure plate is in the normal input state, but the continuity of the opening control loop is abnormal; when the second feedback signal is high and the fourth feedback signal is high, the MCU judges that the opening pressure plate is in the non-input state. In actual application, when the first feedback signal is low and the second feedback signal is high, the detection circuit (or detection unit) itself may have a problem; or, when the third feedback signal is low and the fourth feedback signal is high, the detection circuit (or detection unit) itself may have a problem.

[0065] The MCU can accurately distinguish the abnormality of the control loop connectivity and the state of the un-put-in press plate through the explicit logical rules, avoids misjudgment and missed judgment, and improves the accuracy of the judgment; the MCU analyzes the level state of the feedback signal in real time, can timely find the abnormal state of the control loop or the press plate, gives an early warning, and avoids the occurrence of accidents; through the logical judgment rules, the MCU can automatically identify and report faults, reduces the dependence on manual intervention, and improves the intelligent level of the power distribution system.

[0066] In an optional embodiment, the first resistor R1 and the second resistor R2 satisfy the following condition: I1=(VDD1-V ce -V D ) / (R1+R2+R X ), and I1 is greater than or equal to a preset current threshold when the closing control loop is turned on, and the preset current threshold represents the minimum turn-on current of the first optocoupler U1; wherein VDD1 represents the voltage of the first power supply, V ce represents the secondary saturation turn-on voltage drop of the first optocoupler U1, V D represents the primary turn-on 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 turned on.

[0067] In the above embodiment, it is ensured that the closing control loop can provide sufficient current when turned on, so that the first optocoupler can be reliably turned on, thereby accurately detecting the connectivity of the closing control loop. At the same time, this condition also ensures that the first optocoupler will not misjudge when there is an abnormality in the closing control loop, thereby improving the reliability of the entire detection device.

[0068] It should be noted that the fourth resistor R4 and the fifth resistor R5 in the closing press plate state detection module in the foregoing embodiment can also be determined in a similar manner to the first resistor R1 and the second resistor R2 described 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 can be referred to, which will not be described here.

[0069] The application also provides a power distribution terminal closing and opening control loop detection method, which is applied to the power distribution terminal closing and opening control loop detection device of any one of the foregoing embodiments, Figure 2 is a flow chart of a power distribution terminal closing and opening control loop detection method provided by the embodiments of the application, and the flow chart comprises:

[0070] Step S201, sending a pulse test signal to the detection unit;

[0071] Step S202, receiving a group of feedback signals fed back by the detection unit;

[0072] Step S203, judging whether the closing and opening control circuit and the closing and opening pressure plate state are normal based on a set of feedback signals.

[0073] Through the above steps, by sending a pulse test signal to the detection unit and receiving feedback signals to judge the closing and opening control circuit and the pressure plate state, it is ensured that potential problems can be found and handled in time when a fault occurs, avoiding the problem of switch failure caused by control circuit opening or poor contact; through comprehensive detection of the closing and opening control circuit and the corresponding pressure plate state, the workload of manual inspection is reduced, so that the maintenance personnel can quickly locate and solve the problem, thereby 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 state of the pressure plate, ensuring that the correct disconnection of the pressure plate can be accurately understood during equipment maintenance, preventing safety accidents caused by misoperation; through a set of feedback signals, the connectivity of the closing control circuit and the state of the closing pressure plate can be accurately judged, and the connectivity of the opening control circuit and the state of the opening pressure plate can also be judged, providing a clear direction for troubleshooting. The purpose of real-time detection of the closing and opening control circuit and the pressure plate state of the power distribution terminal is achieved.

[0074] In the above embodiment, the MCU sends a pulse test signal to the detection unit to trigger the closing and opening circuit detection module and the pressure plate state detection module to detect, and the detection unit detects the connectivity of the closing and opening control circuit and the state of the pressure plate after receiving the pulse test signal, and sends the detection result back to the MCU in the form of feedback signal; the MCU judges whether the closing and opening control circuit and the closing and opening pressure plate state are normal based on the received feedback signal according to the preset logic, if the feedback signal conforms to the logic 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, the MCU sends a pulse test signal in real time and receives a set of feedback signals, realizing real-time monitoring of the closing and opening control circuit and the pressure plate state, which can find potential problems in time and avoid accidents; in addition, by analyzing a set of feedback signals, the MCU can quickly judge the fault point, helping the maintenance personnel to quickly locate the problem and improving the maintenance efficiency; through the automatic detection and judgment process, the dependence on manual intervention is reduced, and the intelligent level of the power distribution system is improved.

[0075] In an optional embodiment, whether the closing and opening control circuit and the closing and opening pressure plate state are normal is judged based on a set of feedback signals, including: when the first feedback signal is low and the third feedback signal is low, it is judged that the continuity of the closing control circuit is normal, and the closing pressure plate is in a normal input state; when the first feedback signal is high and the third feedback signal is low, it is judged that the closing pressure plate is in a normal input state, but the continuity of the closing control circuit is abnormal; when the first feedback signal is high and the third feedback signal is high, it is judged that the closing pressure plate is in an un-input state; when the second feedback signal is low and the fourth feedback signal is low, it is judged that the continuity of the opening control circuit is normal, and the opening pressure plate is in a normal input state; when the second feedback signal is high and the fourth feedback signal is low, it is judged that the opening pressure plate is in a normal input state, but the continuity of the opening control circuit is abnormal; when the second feedback signal is high and the fourth feedback signal is high, it is judged that the opening pressure plate is in an un-input state.

[0076] In the above embodiment, through the explicit level logic relationship, the MCU can accurately judge the specific state of the closing and opening system, 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, help the operation and maintenance personnel quickly determine whether it is a control circuit problem or a pressure plate state problem, and improve the operation and maintenance efficiency. The closing and opening control circuit detection method of the power distribution terminal can accurately detect the continuity of the closing and opening control circuit and the pressure plate state in real time.

[0077] When the first feedback signal is low and the third feedback signal is low, the MCU judges that the continuity of the closing control circuit is normal, and the closing pressure plate is in a normal input state; when the first feedback signal is high and the third feedback signal is low, the MCU judges that the closing pressure plate is in a normal input state, but the continuity of the closing control circuit is abnormal; when the first feedback signal is high and the third feedback signal is high, the MCU judges that the closing pressure plate is in an un-input state. When the second feedback signal is low and the fourth feedback signal is low, the MCU judges that the continuity of the opening control circuit is normal, and the opening pressure plate is in a normal input state; when the second feedback signal is high and the fourth feedback signal is low, the MCU judges that the opening pressure plate is in a normal input state, but the continuity of the opening control circuit is abnormal; when the second feedback signal is high and the fourth feedback signal is high, the MCU judges that the opening pressure plate is in an un-input state. In actual application, when the first feedback signal is low and the second feedback signal is high, the detection circuit (or detection unit) itself may have a problem; or, when the third feedback signal is low and the fourth feedback signal is high, the detection circuit (or detection unit) itself may have a problem.

[0078] The embodiment can accurately distinguish the control loop connectivity abnormality and the platen non-throw-in state through the explicit logical rule, avoids misjudgment and missed judgment, and improves the accuracy of judgment; the MCU analyzes the level state of the feedback signal in real time, can timely find the abnormal state of the control loop or the platen, gives an early warning in advance, and avoids the occurrence of an accident; through the logical judgment rule, the MCU can automatically identify and report the fault, reduces the dependence on manual intervention, and improves the intelligent level of the power distribution system.

[0079] It should be noted that the above-described embodiments are only part of the embodiments of the present application, not all. The present application will be specifically described below in combination with specific embodiments.

[0080] The embodiment of the present application provides a power distribution terminal closing and opening circuit detection system and method, Figure 3 is a schematic diagram of a closing and opening circuit detection system provided by the embodiment of the present application, comprising an MCU, a detection circuit and a switching device, wherein the MCU and the detection circuit are both located in a power distribution terminal, and the detection circuit is used for detecting the connectivity of the closing and opening circuit and the state of the closing and opening platen.

[0081] The following explains several signals in Figure 3

[0082] DXQD: wire break detection start signal, MCU output;

[0083] HZDX: closing loop wire break signal, MCU input;

[0084] HZYBDX: closing platen wire break signal, MCU input;

[0085] FZDX: opening loop wire break signal, MCU input;

[0086] FZYBDX: opening platen wire break signal, MCU input.

[0087] Figure 4 is a schematic diagram of a closing and opening circuit detection circuit provided by the embodiment of the present application, which will be described below in combination with the Figure 4 The detection circuit of the embodiment of the present application will be described in detail.

[0088] VDD (corresponding to the third power supply described above), VDD1 (corresponding to the first power supply described above), and VDD2 (corresponding to the second power supply described above) must be three mutually electrically isolated power supplies, and the voltages of VDD1 and VDD2 are lower than the normal closing and opening voltage (generally DC 24V), which is set to DC 5V, to prevent the on-off detection from triggering the switching action by mistake.

[0089] ​The first resistor R1 and the second resistor R2 are current limiting resistors. On one hand, the current I is set by adjusting the resistance value t The size of the current I is ensured when the circuit is turned on t The size of the current I is ensured when the circuit is turned on c The size of the current I is ensured when the circuit is turned on 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 circuit resistance when the closing circuit is normally turned on, including the cable resistance, the contact resistance of the contact piece, the resistance of the switch coil, etc., which is usually tens of ohms, and the resistance value will increase when the contact is poor or the elements on the circuit are abnormal;

[0090] Since the first power supply VDD1 has a low voltage, the resistance value of the first resistor R1 and the second resistor R2 can not be very large, and the change of R x has a significant impact on the size of the current I t . By reasonably setting the normal I t , when the control circuit impedance abnormally increases but is not completely disconnected, the increase of Rx will cause the actual I t to be less than I c , and the third optocoupler U3 will not be turned on. In this way, not only the detection of the disconnection of the control circuit can be realized, but also the detection of the abnormality of the circuit when it is not completely disconnected can be realized to a certain extent. When the circuit impedance abnormally increases, the normal closing and opening of the switch will also fail. The design scheme in the related art only considers the case where the circuit is completely disconnected, and does not consider the case where the contact is poor.

[0091] On the other hand, the first resistor R1 and the second resistor R2 can be used as protection resistors to prevent the failure of the first power supply VDD1 and other elements from causing the closing pressure plate to be turned on through the detection circuit path. This is necessary because any electronic element has the possibility of failure. Due to the presence of the detection circuit, there are other redundant paths on the two contacts of the pressure plate. Once the elements 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 presence of the first resistor R1 and the second resistor R2, the impedance on the redundant path is large, and the current is not enough to drive the switch device when the normal closing and opening voltage is applied (the normal closing and opening current is more than 10A). Therefore, the first resistor R1 and the second resistor R2 are selected to be high-reliability plug-in metal film resistors.

[0092] 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 the same.

[0093] Brief Introduction of Components Function:

[0094] Since the control circuit is connected with primary switching device, in order to ensure the reliability of the device, the control circuit and other circuits of the terminal need to be electrically isolated, 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 all need to have electrical isolation function.

[0095] U1: loop detection start signal output, controlled by the MCU output DXQD signal (corresponding to the aforementioned pulse test signal) to turn on and transfer output;

[0096] U2: pressure plate detection start signal output, controlled by the MCU output DXQD signal to turn on and transfer output;

[0097] U3: closing control circuit broken line feedback signal (corresponding to the aforementioned first feedback signal), output signal HZDX to MCU, low level indicates that the closing control circuit is normal, high level indicates that the closing control circuit is not working;

[0098] U5: opening control circuit broken line feedback signal (corresponding to the aforementioned second feedback signal), output signal HZDX to MCU, low level indicates that the opening control circuit is normal, high level indicates that the opening control circuit is not working;

[0099] U4: closing pressure plate broken line feedback signal (corresponding to the aforementioned third feedback signal), output signal HZYBDX to MCU, low level indicates that the pressure plate is normal, high level indicates that the closing pressure plate is abnormal;

[0100] U6: opening pressure plate broken line feedback signal (corresponding to the aforementioned fourth feedback signal), output signal FZYBDX to MCU, low level indicates that the pressure plate is normal, high level indicates that the opening pressure plate is abnormal;

[0101] D1-D4: ordinary rectifier diode, reverse peak voltage not less than 1kV, one is to enhance the circuit resistance and withstand voltage, because the closing and opening control circuit may withstand the impact of lightning surge, the second is to control the one-way transmission of signals, to prevent other signals from flowing in reverse and causing unexpected circuit conduction.

[0102] The basic working principle of detection is as follows:

[0103] (1) The internal MCU of the power distribution terminal sends out pulse signal DXQD regularly; the effective pulse width is less than 1ms, the reason for choosing pulse signal instead of continuous conduction is based on two points: 1) to further prevent the possibility of continuous power output mis-triggering switch action, short pulse width signal cannot cause switch action; 2) to reduce the power consumption of the entire circuit;

[0104] (2) The first optocoupler U1 and the second optocoupler U2 are turned on, and the first power supply VDD1 and the second power supply VDD2 are connected to the rear-end circuit;

[0105] (3) If the control loop is connected, the third optocoupler U3, the fourth optocoupler U4, the fifth optocoupler U5 and the sixth optocoupler U6 are turned on, and a low-level signal is output to the MCU, otherwise a high-level signal is kept;

[0106] (4) Within a certain time range of the DXQD signal, the MCU judges according to the received pulse signal:

[0107] HZDX low level, HZYBDX low level: the whole closing control loop is normal;

[0108] HZDX high level, HZYBDX low level: the closing pressure plate is normally put in, but the closing control loop is abnormal;

[0109] HZDX low level, HZYBDX high level: there may be an abnormality in the detection circuit;

[0110] HZDX high level, HZYBDX high level: the closing pressure plate is not put in;

[0111] The opening circuit detection and the closing circuit detection are the same, and will not be described here.

[0112] (5) The MCU sends information to the background system when an abnormality occurs, and notifies the operation and maintenance personnel.

[0113] Figure 5 is a wiring schematic diagram of a closing and opening circuit detection system provided by an embodiment of the present application, and in combination with Figure 4 the circuit principle diagram, the connection relationship between the detection circuit and the closing and opening control loop of the embodiment can be known, such as the labels HZ+, HZC+ and VDD1- in the figure. It should be noted that Figure 4 the principle diagram in the figure mainly shows the detection circuit, and does not include the complete closing and opening control loop.

[0114] In the embodiment of the present application, the detection of the whole control loop and the hard pressure plate is realized by two independent power supplies and circuits; and the pulse signal detection can avoid the risk of misoperation of the switch.

[0115] Compared with the prior art, the embodiment of the present application has at least the following advantages: 1) the detection of whether the hard pressure plate is normally put in can be realized; 2) whether the control loop abnormality occurs in the pressure plate or the terminal outside can be distinguished, which can assist the operation and maintenance personnel to quickly locate the fault position; 3) the abnormal situation detection of the loop contact being poor but not completely disconnected can be realized; and 4) the switch misoperation caused by the loop disconnection detection can be avoided.

[0116] Those skilled in the art can clearly understand the method according to the above-mentioned embodiments can be realized by means of software and necessary general hardware platform, of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of software product in essence or the part of the prior art, the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disc, optical disc), including a plurality of instructions to make a terminal device (may be mobile phone, computer, server, or network equipment, etc.) executes the method described in various embodiments of the present application.

[0117] The present application also provides a computer readable storage medium, the computer readable storage medium stores instructions, when the instructions are executed, the method steps of any one of the above-mentioned methods are executed.

[0118] In an exemplary embodiment, the above-mentioned computer readable storage medium can include but not limited to: U disk, read-only memory (Read-Only Memory, ROM for short), random access memory (Random Access Memory, RAM for short), mobile hard disk, magnetic disc or optical disc and various computer program storage media.

[0119] In the above-mentioned embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0120] The above-mentioned are only exemplary embodiments of the present disclosure, which cannot limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. Those skilled in the art will easily think of other embodiments of the present disclosure after considering the disclosure of the specification.

[0121] The present application is intended to cover any variations, uses or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field which are not recorded in the present disclosure.

Claims

1. A detection device for a switching control circuit of a power distribution terminal, characterized by, include: The detection unit includes a closing circuit detection module, a tripping circuit detection module, a closing pressure plate status detection module, and a tripping pressure plate status detection module. The MCU is used to send a pulse test signal to the detection unit and receive a set of feedback signals input by the detection unit, wherein the effective pulse width of the pulse test signal is less than 1ms; The MCU is electrically connected to the closing circuit detection module and the opening circuit detection module via 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. 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 continuity 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. 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 continuity of the opening control circuit and input a second feedback signal to the MCU. The MCU is electrically connected to the closing pressure plate status detection module and the opening pressure plate status detection module via a second optocoupler. The closing pressure plate status detection module is connected in parallel to both ends of the closing pressure plate, wherein the closing pressure plate status detection module is used to detect the status of the closing pressure plate and input a third feedback signal to the MCU; the opening pressure plate status detection module is connected in parallel to both ends of the opening pressure plate, wherein the opening pressure plate status detection module is used to detect the status of the opening pressure plate and input a fourth feedback signal to the MCU. The MCU is used to determine whether the opening and closing control circuit and the opening and closing pressure plate are normal based on the set of feedback signals. 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. The opening and closing pressure plate includes the opening pressure plate and the closing pressure plate. The MCU makes its judgment based on the set of feedback signals in the following manner: When both the first feedback signal and the third feedback signal are low, it is determined that the connectivity of the closing control circuit is normal, and the closing switch is in a normally engaged state. When both the first feedback signal and the third feedback signal are high, it is determined that the closing switch is in a normally engaged state, but the connectivity of the closing control circuit is abnormal. When both the first feedback signal and the third feedback signal are high, it is determined that the closing switch is in a non-engaged state. When the second feedback signal is low and the fourth feedback signal is low, it is determined that the connectivity of the tripping control circuit is normal, and the tripping pressure plate is in a normal engaged state; when the second feedback signal is high and the fourth feedback signal is low, it is determined that the tripping pressure plate is in a normal engaged state and the connectivity of the tripping control circuit is abnormal; when the second feedback signal is high and the fourth feedback signal is high, it is determined that the tripping pressure plate is in an unengaged state.

2. The apparatus of claim 1, wherein, The target output terminal of the MCU is electrically connected to the first input terminal of the first optocoupler, and 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 apparatus of claim 1, wherein, The closing circuit detection module includes: a third optocoupler, a first diode, a first resistor, a second resistor, and a third resistor, wherein... The first output terminal of the first optocoupler is electrically connected to the positive terminal 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 terminal of the closing pressure plate through the first resistor. The second terminal of the closing coil is electrically connected to the negative terminal of the first power supply through the second resistor. The first output terminal of the third optocoupler is electrically connected to the positive terminal of the third power supply through the third resistor. The second output terminal of the third optocoupler is electrically connected to the ground terminal. The first output terminal of the third optocoupler is used to output the first feedback signal.

4. The apparatus of claim 3, wherein, The closing pressure plate status detection module includes: a fourth optocoupler, a second diode, a fourth resistor, a fifth resistor, and a sixth resistor, wherein... The first output terminal of the second optocoupler is electrically connected to the positive terminal 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 terminal of the closing pressure plate through the fourth resistor. The second terminal of the closing pressure plate is also electrically connected to the negative terminal of the second power supply through the fifth resistor. The first output terminal of the fourth optocoupler is electrically connected to the positive terminal of the third power supply through the sixth resistor. The second output terminal of the fourth optocoupler is electrically connected to the ground terminal. The first output terminal of the fourth optocoupler is used to output the third feedback signal.

5. The apparatus of claim 1, wherein, The tripping circuit detection module includes: a fifth optocoupler, a third diode, a seventh resistor, an eighth resistor, and a ninth resistor, wherein... The first output terminal of the first optocoupler is electrically connected to the positive terminal 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 tripping pressure plate through the seventh resistor. The second end of the tripping coil is electrically connected to the negative terminal of the first power supply through the eighth resistor. The first output terminal of the fifth optocoupler is electrically connected to the positive terminal of the third power supply through the ninth resistor. The second output terminal of the fifth optocoupler is electrically connected to the ground terminal. The first output terminal of the fifth optocoupler is used to output the second feedback signal.

6. The apparatus of claim 5, wherein, The tripping gate status detection module includes: a sixth optocoupler, a fourth diode, a tenth resistor, an eleventh resistor, and a twelfth resistor, wherein... The first output terminal of the second optocoupler is electrically connected to the positive terminal 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 terminal of the tripping voltage plate through the tenth resistor. The second terminal of the tripping voltage plate is also electrically connected to the negative terminal of the second power supply through the eleventh resistor. The first output terminal of the sixth optocoupler is electrically connected to the positive terminal of the third power supply through the twelfth resistor. The second output terminal of the sixth optocoupler is electrically connected to the ground terminal. The first output terminal of the sixth optocoupler is used to output the fourth feedback signal.

7. The apparatus 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 the connectivity of the trip control circuit and the status of the trip pressure plate based on the second feedback signal and the fourth feedback signal.

8. A method for detecting the opening and closing control circuit of a power distribution terminal, characterized in that, Applied in any one of claims 1 to 7, comprising: A pulse test signal is sent to the detection unit, wherein the effective pulse width of the pulse test signal is less than 1ms; Receive a set of feedback signals from the detection unit; Based on the set of feedback signals, determine whether the opening and closing control circuit and the opening and closing pressure plate are normal; The determination of whether the opening / closing control circuit and the opening / closing pressure plate are normal based on the set of feedback signals includes: When both the first feedback signal and the third feedback signal are low, it is determined that the connectivity of the closing control circuit is normal, and the closing switch is in a normally engaged state. When both the first feedback signal and the third feedback signal are high, it is determined that the closing switch is in a normally engaged state, but the connectivity of the closing control circuit is abnormal. When both the first feedback signal and the third feedback signal are high, it is determined that the closing switch is in a non-engaged state. When the second feedback signal is low and the fourth feedback signal is low, it is determined that the connectivity of the tripping control circuit is normal, and the tripping pressure plate is in a normal engaged state; when the second feedback signal is high and the fourth feedback signal is low, it is determined that the tripping pressure plate is in a normal engaged state and the connectivity of the tripping control circuit is abnormal; when the second feedback signal is high and the fourth feedback signal is high, it is determined that the tripping pressure plate is in an unengaged state.

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