Looped net box control loop monitoring device

Abstract

This invention relates to the field of control loop monitoring devices, specifically a ring main unit (RMU) control loop monitoring device, comprising a monitoring host 1 and four sets of monitoring access terminal groups connected thereto. The monitoring host 1 includes a main control unit, a potential acquisition module, a storage unit, and a power supply module. The four sets of monitoring access terminal groups include: a control loop main power supply monitoring terminal group 2, used to connect to the power supply side and load side of the control loop main power switch; and a remote control loop monitoring terminal group 3, used to connect to the output contacts of the remote control tripping relay and the closing relay. This invention solves the problems of unobservable control loop status, difficult fault location, and lack of operation recording in RMU control loops. It supports uninterrupted power supply installation, is suitable for the renovation and new construction of various RMUs, and helps improve remote control success rate and operation and maintenance efficiency.

Description

Technical Field

[0001] This invention relates to the field of control loop monitoring devices, specifically a ring network box control loop monitoring device. Background Technology

[0002] As a critical node device in the power distribution network, the reliability of the control loop (including power supply, remote control, local operation, and signal loops) of the ring main unit directly determines the power supply reliability and automation level. Currently, ring main units generally use the traditional terminal block wiring method to construct the control loop.

[0003] However, the potential faults in this traditional model are difficult to detect early. Because the ring main unit is in a humid and dusty outdoor environment for a long time, the terminals and wire connections are prone to corrosion and loose connections. Such hidden defects are difficult to detect during routine inspections and are often only exposed when remote control fails or the switch is malfunctioned, resulting in delayed handling. After a remote control failure, maintenance personnel need to check each section on-site, which takes an average of 2-4 hours. It is also impossible to quickly distinguish whether the fault is in the secondary circuit or the switch mechanism itself. Furthermore, due to the lack of real-time monitoring of the circuit status, command execution failures caused by hidden faults such as broken wires and poor contacts cannot be predicted, which restricts the self-healing function of the distribution network. In addition, there is no electronic record of local button operations. When misoperation or unclear opening and closing occurs, the staff cannot trace the source, which makes accident analysis difficult.

[0004] Currently, existing monitoring methods are insufficient, with inaccurate early judgment criteria or only providing simple alarm presence / absence information, failing to pinpoint specific faulty sections. Therefore, we propose a ring main unit control loop monitoring device. Summary of the Invention

[0005] The purpose of this invention is to provide a ring main unit control loop monitoring device, which has the advantages of parallel connection of high-resistance monitoring terminals at key transition nodes of the control loop, and real-time evaluation of the loop integrity and functional status by collecting the potential of each node relative to a reference point and combining it with preset logical judgment rules. This solves the problems of unobservable ring main unit control loop status, difficulty in fault location, and lack of operation records.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a ring main unit control loop monitoring device, comprising a monitoring host and four sets of monitoring access terminal blocks connected thereto; The monitoring host includes a main control unit, a potential acquisition module, a storage unit, and a power supply module; The four sets of monitoring access terminal groups include: The control circuit main power monitoring access terminal group is used to connect to the power supply side and load side of the control circuit main power switch; The remote control circuit monitoring access terminal group is used to connect the output contacts of the remote control opening relay and the closing relay; The local electric operation circuit monitoring access terminal group is used to connect the local operation trip button and close button; The DTU connects to a hard contact terminal block, which is used to output alarm signals to the DTU device in the form of dry contacts.

[0007] Preferably, the potential acquisition module includes multiple high-impedance differential input channels, wherein the single-channel input impedance is not less than 1MΩ, and the sampling frequency can be switched between 1Hz and 10Hz; When a potential change is detected, it automatically switches to high-frequency sampling, and resumes regular sampling after a few seconds.

[0008] Preferably, the monitoring host also includes an environmental sensor for monitoring the temperature and humidity of the installation environment, wherein the environmental data is stored in association with the potential monitoring data, and a local alarm is triggered when the environment is abnormal.

[0009] Preferably, the device is equipped with a configuration interface, and the following parameters can be set through an external configuration tool: alarm threshold for each monitoring item, alarm delay time, minimum effective duration of local operation record, and device communication address.

[0010] Preferably, the abnormality criterion for the control loop total power monitoring access terminal group is: the load side potential is continuously lower than the power supply side potential to a set threshold and exceeds a set delay time; The set threshold can be configured in the range of 2-5V, and the set delay time can be configured in the range of 3-10 seconds.

[0011] Preferably, the monitoring logic of the remote control circuit monitoring access terminal group includes: When there is no remote control command, monitor whether the two ends of the contact are in a high-resistance state; After the DTU issues a remote control command, monitor whether both ends of the contact point become conductive within a set time. When the switch is in the target position, monitor for any abnormal command potentials.

[0012] Preferably, the condition for the local electric control circuit monitoring access terminal group to record potential reversal events is that the reversal duration is greater than the set minimum effective time and less than the set maximum reasonable time. Short pulses lasting less than 50ms are considered interference and not recorded.

[0013] Preferably, the device supports installation without power interruption: during installation, it is only necessary to disconnect the main power switch of the control circuit, connect the monitoring terminals in parallel to each monitoring point, and then restore the main power switch after the wiring is completed.

[0014] Preferably, the power module adopts a wide voltage input design, supports DC5-36V input, and can be directly powered from the existing remote signaling power supply of the ring network box; The power module integrates a supercapacitor, which can maintain clock operation and complete the recording of current events when the external power supply is interrupted.

[0015] Preferably, the device has a comprehensive fault diagnosis function: when a remote control command is issued, if it is detected that the potential of the remote control circuit is normally flipped but the switch is not activated, the device will provide indication information of the possible fault area based on the potential status of the execution relay.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention constructs a holographic potential sensing network for the control loop by employing high-impedance parallel connection and multi-node potential acquisition technology. This achieves a qualitative change in the status of the secondary loop, transforming it from an unobservable, black-box operation to a real-time observable and transparent diagnostic system. Without altering the original wiring or affecting the loop function, it enables non-intrusive monitoring of key nodes such as power supply, remote control, and local operation. It can capture potential anomalies caused by latent defects such as terminal corrosion and loose connections in real time, shifting fault detection from traditional reactive exposure to proactive early warning. This fundamentally solves the problem of blind spots in the status sensing of the end of the distribution network automation.

[0017] 2. This invention can not only determine whether there is a fault, but also combine multi-dimensional information such as remote control commands, relay status, and execution node potential to intelligently distinguish whether the fault is located on the DTU output side, the intermediate relay circuit, or the switch actuator body. This function reduces the average on-site fault diagnosis time from 2-4 hours to minutes and directly guides maintenance personnel to pinpoint the smallest fault area, greatly improving emergency repair efficiency.

[0018] 3. By supporting uninterrupted installation and integrating high-precision time stamp recording functions, this invention improves the convenience of operation and maintenance while constructing a full lifecycle traceability system for operational behavior. The parallel access method allows the device to be quickly deployed under the condition of only briefly disconnecting the control power supply. Its accurate recording of all local button operations provides tamper-proof objective electronic evidence for the subsequent analysis of misoperation, unclear separation and combination and other events, and strengthens the standardization and traceability of operation management. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention.

[0020] In the diagram: 1. Monitoring host; 2. Control circuit main power supply monitoring access terminal group; 3. Remote control circuit monitoring access terminal group; 4. Local electric operation circuit monitoring access terminal group; 5. DTU access hard contact terminal group. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The monitoring host 1, the control circuit main power monitoring access terminal group 2, the remote control circuit monitoring access terminal group 3, the local electric operation circuit monitoring access terminal group 4, and the DTU access hard contact terminal group 5 of this application are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0023] Please see Figure 1 As shown, the present invention provides a technical solution: a ring main unit control loop monitoring device, comprising: Monitoring Host 1: Contains a main control unit, a potential acquisition module, a storage unit, a clock unit, and a display unit. The main control unit uses an industrial-grade microcontroller with built-in fault diagnosis logic algorithms. The potential acquisition module includes multiple high-impedance differential input channels with an input impedance ≥1MΩ to ensure that the connection does not affect the original circuit. The storage unit uses non-volatile memory and can store no less than 2000 event records. The clock unit has a built-in high-precision RTC with an error of less than ±2 seconds / day. The display unit uses a 2.4-inch LCD screen to display real-time potential, alarm information, and historical records. Four sets of monitoring access terminal groups: Control circuit main power monitoring access terminal group 2: includes incoming terminal L+_IN and outgoing terminal L+_OUT, which are respectively connected to the power supply side and load side of the control circuit main power double-pole switch (or circuit breaker); Remote control circuit monitoring access terminal group 3: includes remote control tripping monitoring terminal YR_F and remote control closing monitoring terminal YR_H, which are respectively connected to the two ends of the normally open contact of the remote control tripping relay and the two ends of the normally open contact of the remote control closing relay; Local electrical control circuit monitoring access terminal group 4: includes local trip button monitoring terminal YL_F and local close button monitoring terminal YL_H, which are connected in parallel to the two ends of the trip button and close button of the local control box, respectively; DTU access hard contact terminal group 5: includes common terminal COM, main power alarm contact ALM_PWR, remote control circuit alarm contact ALM_YC and local operation record contact SIG_LC, which are passive dry contact outputs.

[0024] Auxiliary function modules: Environmental sensors: Integrated temperature and humidity sensors monitor the environmental conditions of the secondary chamber of the ring main unit, and perform correlation analysis between environmental data and electrical monitoring data; Configuration interface: Provides a Micro-USB interface, which allows you to set parameters such as monitoring thresholds and alarm delays through configuration tools; Status indicator lights: Three-color LEDs indicate the device's operating status (normal / alarm / fault).

[0025] This technical solution: After the device is powered on, the potential acquisition module cyclically acquires the potential values ​​of each monitoring terminal (relative to the device's internal reference ground) at a frequency of 1Hz. The main control unit performs status judgment based on the following logic: Total power circuit monitoring: Real-time comparison of the potentials of L+_IN and L+_OUT terminals. Under normal circumstances, the potential difference between the two should be less than 0.5V (considering line voltage drop). When the L+_OUT potential is detected to be lower than the L+_IN potential by more than the set threshold (default 3V) and lasts for more than 5 seconds, it is determined to be "total power circuit abnormal". Possible causes include: poor contact of the power circuit breaker, loose connection of the terminal block, and abnormal output of the power module. Remote control circuit monitoring: Monitor the potential of terminals YR_F and YR_H. When the DTU issues a remote control tripping command, the remote control tripping relay should be energized, and the potential at both ends of YR_F should change from a high-resistance state (potential difference close to the power supply voltage) to a conducting state (potential difference less than 2V). If no potential change is detected within 2 seconds after the command is issued, it is determined that the "remote control circuit is disconnected". At the same time, the device also monitors the "false signal" situation: when the switch is in the open position, if an abnormal conduction signal is detected at terminal YR_F, the "suspected false tripping command" event is recorded. Local electric operation circuit monitoring: Monitor the potential of terminals YL_F and YL_H. When the button is pressed, the potential of the corresponding terminal flips. The device records the time, duration and button type of each potential flip. Short pulses with a duration of less than 50ms are judged as jitter interference and are not recorded. Comprehensive fault diagnosis: Combine multi-node potential information for comprehensive diagnosis. For example, if after the remote control command is issued, the YR_F potential is detected to flip normally, but the switch does not operate, and at the same time, no potential change is detected at both ends of the tripping execution relay, it can be preliminarily determined that the fault point is after the execution relay, which may be a relay coil fault or a jammed mechanism. Instruct the operation and maintenance personnel to focus on checking the primary mechanism.

[0026] The monitoring results are output in three ways: Local display: The LCD screen displays the potential of each point, the status of the circuit, and the latest alarms in real time.

[0027] Local storage: All alarm events and local operation logs are stored with timestamps.

[0028] Remote transmission: Key alarms (main power failure, remote control circuit failure) are connected to the DTU remote signaling via dry contact and uploaded to the distribution network master station.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A monitoring device for the control loop of a ring main unit, characterized in that, It includes a monitoring host (1) and four sets of monitoring access terminal groups connected to it; The monitoring host (1) includes a main control unit, a potential acquisition module, a storage unit and a power supply module; The four sets of monitoring access terminal groups include: The control circuit main power monitoring access terminal group (2) is used to connect to the power supply side and load side of the control circuit main power switch; The remote control circuit monitoring access terminal group (3) is used to connect the output contacts of the remote control opening relay and the closing relay; Local electric operation circuit monitoring access terminal group (4) is used to connect the local operation trip button and the close button; The DTU access hard contact terminal group (5) is used to output alarm signals to the DTU device in the form of dry contacts.

2. The ring network box control loop monitoring device according to claim 1, characterized in that: The potential acquisition module includes multiple high-impedance differential input channels, wherein the single-channel input impedance is not less than 1MΩ, and the sampling frequency can be switched between 1Hz and 10Hz. When a potential change is detected, it automatically switches to high-frequency sampling, which lasts for 2 seconds before resuming regular sampling.

3. The ring main unit control loop monitoring device according to claim 1, characterized in that: The monitoring host also includes an environmental sensor for monitoring the temperature and humidity of the installation environment. The environmental data is stored in association with the potential monitoring data, and a local alarm is triggered when the environment is abnormal.

4. The ring main unit control loop monitoring device according to claim 1, characterized in that: The device is equipped with a configuration interface.

5. The ring network box control loop monitoring device according to claim 1, characterized in that: The abnormality criterion for the control loop total power monitoring access terminal group (2) is: the load side potential is continuously lower than the power side potential to the set threshold and exceeds the set delay time. The set threshold can be configured in the range of 2-5V, and the set delay time can be configured in the range of 3-10 seconds.

6. The ring main unit control loop monitoring device according to claim 1, characterized in that: The monitoring logic of the remote control circuit monitoring access terminal group (3) includes: When there is no remote control command, monitor whether the two ends of the contact are in a high-resistance state; After the DTU issues a remote control command, monitor whether both ends of the contact point become conductive within a set time. When the switch is in the target position, monitor for any abnormal command potentials.

7. The ring main unit control loop monitoring device according to claim 1, characterized in that: The condition for the local electric operation circuit monitoring access terminal group (4) to record potential reversal events is that the reversal duration is greater than the set minimum effective time and less than the set maximum reasonable time. Short pulses lasting less than 50ms are considered interference and not recorded.

8. The ring main unit control loop monitoring device according to claim 1, characterized in that: The device supports installation without power interruption: during installation, simply disconnect the main power switch of the control circuit, connect the monitoring terminals in parallel to each monitoring point, and then restore the main power switch after the wiring is completed.

9. The ring main unit control loop monitoring device according to claim 1, characterized in that: The power module adopts a wide voltage input design, supporting DC5-36V input; The power module integrates a supercapacitor, which can maintain clock operation and complete the recording of current events when the external power supply is interrupted.

10. The ring main unit control loop monitoring device according to claim 1, characterized in that: The device has a comprehensive fault diagnosis function: when a remote control command is issued, if it is detected that the potential of the remote control circuit is normally flipped but the switch does not operate, it will provide indication information of the possible fault area by combining the potential status of the execution relay.

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