Reversible power distribution terminal remote signaling overvoltage protection method and device

Abstract

The invention discloses a reversible power distribution terminal remote signaling overvoltage protection device, and the device comprises an input voltage module which is used for inputting adaptive different DC power supply voltages; the anti-overvoltage protection module is used for obtaining a rated voltage through conversion based on different power supply voltages and outputting different logic signals through a remote signaling loop based on the rated voltage, and the rated voltage is DC24V; and the remote signaling loop module is used for sampling the logic signal to obtain an alarm signal, and the input end of the remote signaling loop module is connected with the output end of the anti-overvoltage protection module.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power distribution terminals of power distribution automation systems, and particularly relates to a reversible power distribution terminal remote signaling overvoltage protection method and device. BACKGROUND

[0002] As a crucial secondary monitoring device in the power system, the power distribution terminal is used for real-time monitoring of line operation states, and can acquire key data such as voltage, current, active power and reactive power of the line, judges whether the line has a fault through power flow calculation, and timely completes fault handling, thereby providing a solid guarantee for stable operation of the power system. Among the many functions of the power distribution terminal, the remote signaling function occupies a key position. Its main role is to monitor the state of the switching device in real time, and once a fault signal occurs, it can be quickly reported to help operation and maintenance personnel to timely discover and handle potential hidden dangers. Moreover, the remote signaling information provides an indispensable key basis for the main station to quickly locate the fault section and start feeder automation (FA) to realize fault isolation and power restoration, and is of great significance to improving the operation efficiency and reliability of the power system. However, the power distribution terminal on the market in China has certain deficiencies in the design of remote signaling power supply. On the one hand, the remote signaling power supply voltage is DC 24V, and the remote signaling circuit power supply end directly adopts a resistor voltage division design. This design makes the device not have a long-time overvoltage protection function. On the other hand, in actual engineering, personnel deploy wiring on site. When the remote signaling loop of the power distribution terminal is mistakenly connected to DC 220V on site, the current in the circuit will be too large to exceed the carrying current capacity of the circuit, thereby causing the PCB board to burn out, so that the power distribution terminal device cannot be normally used. More seriously, this situation may also threaten the personal safety of the engineering wiring personnel, bringing great risks and hidden dangers to power engineering construction. SUMMARY

[0003] To solve the above problems, the application provides a reversible power distribution terminal remote signaling overvoltage protection method and device. A first-stage overvoltage protection control loop is formed by a thermistor and a voltage stabilizing diode. When overvoltage is connected, the remote signaling loop presents a high resistance state, protecting the subsequent circuit from being damaged. After the voltage returns to normal, the high resistance state of the remote signaling loop disappears, and the terminal works normally. By providing a thermistor and a voltage stabilizing diode, the remote signaling loop allows long-time overvoltage connection, and the circuit will not be damaged, thereby improving the application safety of the power distribution terminal and saving terminal maintenance costs. The device is provided with an overvoltage alarm signal loop to realize a voltage real-time reporting function, which facilitates operation and maintenance personnel to check the wiring state in time, reduces overvoltage hidden dangers, and improves personal safety.

[0004] The first aspect of the application provides a reversible power distribution terminal remote signaling overvoltage protection device, comprising: Input voltage module for inputting different DC power supply voltages; Overvoltage protection module for obtaining a rated voltage through conversion based on different power supply voltages, and outputting different logic signals through a remote signaling loop based on the rated voltage, wherein the rated voltage is DC 24V. Remote signaling loop module for obtaining an alarm signal through sampling of the logic signal, wherein an input end of the remote signaling loop module is connected with an output end of the overvoltage protection module.

[0005] Preferably, the overvoltage protection module comprises an overvoltage protection circuit and an overvoltage alarm signal loop, the overvoltage protection circuit is used for protecting the remote signaling loop module, the overvoltage alarm signal loop is used for obtaining an alarm signal greater than the rated voltage and realizing normal working of the remote signaling loop module through regulated voltage, the overvoltage protection circuit comprises a thermistor and a voltage stabilizing diode, the thermistor is connected in series with the voltage stabilizing diode and is closed with an input end and an output end of the input voltage module, and the overvoltage alarm signal loop is connected with an output end of the thermistor.

[0006] Preferably, the overvoltage alarm signal loop comprises an AD module, a CPU module and an operation and maintenance terminal, the AD module, the CPU module and the operation and maintenance terminal are sequentially connected in signal, the AD module is used for collecting signals of the thermistor, the CPU module is used for judging whether the voltage exceeds the rated voltage through simulation of an overvoltage threshold based on the signals, and the operation and maintenance terminal is used for displaying the alarm signal and the regulated voltage.

[0007] Preferably, the overvoltage alarm signal loop further comprises a communication module, and the CPU module and the operation and maintenance terminal are connected through the communication module.

[0008] Preferably, the collection frequency of the AD module is 80 points per cycle.

[0009] The second aspect of the present application provides a reversible power distribution terminal remote signaling overvoltage protection method, which is applied to the reversible power distribution terminal remote signaling overvoltage protection device in any one of the above aspects, and comprises the following steps: Inputting a voltage through an input voltage module; Dynamically regulating a voltage across a voltage stabilizing diode of an overvoltage protection module through a thermistor of the overvoltage protection module based on the voltage; Obtaining a voltage signal, an alarm signal and dynamically regulating an output end voltage of the thermistor through an overvoltage alarm signal loop based on the voltage.

[0010] Preferably, the step of dynamically regulating the voltage across the voltage stabilizing diode of the overvoltage protection module through the thermistor of the overvoltage protection module based on the voltage further comprises the following steps: If the voltage is DC 24V, the resistance value of the thermistor is 1kΩ, and the voltage across the voltage regulator diode of the overvoltage protection module is regulated to 24V. If the voltage is greater than DC 24V, the resistance value of the thermistor is switched to 10MΩ, and the overvoltage protection module is in a high resistance state.

[0011] Preferably, the step of obtaining a voltage signal, an alarm signal, and dynamically regulating the output voltage of the thermistor based on the voltage further comprises: Obtaining a current analog signal through the AD module of the overvoltage alarm signal circuit based on the voltage. Obtaining an input voltage abnormality condition through the CPU module of the overvoltage alarm signal circuit based on the current analog signal by simulating an overvoltage threshold. Based on the voltage abnormality condition, displaying and inputting a regulated voltage to regulate the voltage of the thermistor through an operation and maintenance terminal.

[0012] Preferably, the step of obtaining an input voltage abnormality condition through the CPU module based on the current analog signal by simulating an overvoltage threshold further comprises: Based on the current analog signal, obtaining a current mean value and real-time sampling values of 8 consecutive sampling points, and calculating the expressions as follows: In the formula, is the current mean value, N is the number of sampling points of the current analog signal, is the sampling index value of the current analog signal, is the sampling value of index value i in the current analog signal; Based on the current mean value, the real-time sampling value, a preset periodic current threshold, and a sampling current threshold, obtaining a voltage abnormality Boolean value and updating the real-time sampling value, and calculating the expression as follows: In the formula is the preset periodic current threshold, is the sampling current threshold, is the voltage abnormality Boolean value; Based on the voltage abnormality Boolean value and the real-time sampling value, updating the voltage abnormality Boolean value, and calculating the expression as follows: Based on the voltage abnormality Boolean value, obtaining the input voltage abnormality condition, and the specific rule is: if the voltage abnormality Boolean value is 1, the input voltage abnormality condition is abnormal, otherwise it is normal.

[0013] Preferably, the step of displaying and inputting the voltage regulation to regulate the voltage of the thermistor based on the voltage abnormality by the operation and maintenance terminal further comprises: If the voltage abnormality is an abnormal driving pressure alarm signal transmitted to the operation and maintenance terminal, the pressure alarm signal comprises a remote signaling point; Based on the pressure alarm signal, the voltage across the voltage stabilizing diode is updated by regulating the voltage value of the corresponding remote signaling point.

[0014] The present application has the following advantages and positive effects compared with the prior art: by using the above technical scheme, the first-stage overvoltage protection control loop is formed by the thermistor and the voltage stabilizing diode, when overvoltage is connected, the remote signaling loop presents a high resistance state, protecting the subsequent circuit from being damaged, and when the voltage returns to normal, the high resistance state of the remote signaling loop disappears, and the terminal works normally. By providing the thermistor and the voltage stabilizing diode, the remote signaling loop can be connected for a long time under overvoltage, and the circuit will not be damaged, improving the application safety of the power distribution terminal and saving the terminal maintenance cost; the device is provided with an overvoltage alarm signal loop to realize real-time voltage reporting function, facilitating the operation and maintenance personnel to check the wiring state in time, reducing overvoltage hidden dangers and improving personal safety. BRIEF DESCRIPTION OF DRAWINGS

[0015] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings, in which: Figure 1 The present application is a reversible power distribution terminal remote signaling overvoltage protection method device framework diagram; Figure 2 The present application is a reversible power distribution terminal remote signaling overvoltage protection method device circuit diagram. DETAILED DESCRIPTION

[0016] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present application will be more apparent according to the following description and claims. It should be noted that the drawings are very simplified and non-precise ratios are used, only to facilitate and clarify the purpose of assisting the description of the embodiments of the present application.

[0017] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications will also change accordingly.

[0018] First embodiment Referring to Figure 1 and Figure 2 , the first aspect of the present application provides a reversible power distribution terminal remote signaling overvoltage protection device, comprising: An input voltage module is configured to input different DC power voltages; The overvoltage protection module is configured to obtain a rated voltage through conversion based on different power voltages, and output different logic signals through a remote signaling loop based on the rated voltage, the rated voltage being DC 24V. The remote signaling loop module is configured to obtain an alarm signal through sampling of the logic signal, and an input end of the remote signaling loop module is connected to an output end of the overvoltage protection module.

[0019] The power distribution terminal remote signaling loop front-end design is provided with a series overvoltage protection circuit, and the input voltage is processed by the overvoltage protection circuit and then output to the remote signaling loop as a rated voltage (i.e. DC 24V). Specifically, the overvoltage protection module includes an overvoltage protection circuit and an overvoltage alarm signal loop, the overvoltage protection circuit is configured to protect the remote signaling loop module, and the overvoltage alarm signal loop is configured to obtain an alarm signal greater than the rated voltage and realize normal working of the remote signaling loop module through regulated voltage. The overvoltage protection circuit includes a thermistor and a zener diode, the thermistor and the zener diode are connected in series and are connected to an input end and an output end of the input voltage module. The overvoltage alarm signal loop is connected to an output end of the thermistor. The overvoltage alarm signal loop includes an AD module, a CPU module and an operation and maintenance terminal, the AD module, the CPU module and the operation and maintenance terminal are sequentially connected, the AD module is configured to collect signals of the thermistor, the CPU module is configured to judge whether the voltage exceeds the rated voltage based on the signals and through simulation of an overvoltage threshold, and the operation and maintenance terminal is configured to display the alarm signal and the regulated voltage. The overvoltage alarm signal loop further includes a communication module, and the CPU module and the operation and maintenance terminal are connected through the communication module. The collection frequency of the AD module is 80 points per cycle. The zener diode in the device includes a first zener diode and a second zener diode. The remote signaling loop module includes a first resistor and an optocoupler, the first resistor and the optocoupler are connected in parallel and then connected in parallel with the zener diode.

[0020] Preferably, the overvoltage protection module includes an overvoltage protection circuit and an overvoltage alarm signal loop, the overvoltage protection circuit is configured to protect the remote signaling loop module, and the overvoltage alarm signal loop is configured to obtain an alarm signal greater than the rated voltage and realize normal working of the remote signaling loop module through regulated voltage. The overvoltage protection circuit includes a thermistor and a zener diode, the thermistor and the zener diode are connected in series and are connected to an input end and an output end of the input voltage module. The overvoltage alarm signal loop is connected to an output end of the thermistor.

[0021] The zener diode acts preferentially to clamp a transient peak voltage at the rated voltage. When overvoltage persists, the thermistor reduces the resistance value due to the current heat effect, forming a variable impedance shunt path to further attenuate input voltage fluctuations. This effectively filters surge / harmonic interference and ensures stable power supply for the remote signaling loop at the back end.

[0022] Preferably, the overvoltage alarm signal circuit comprises an AD module, a CPU module and an operation and maintenance terminal, the AD module, the CPU module and the operation and maintenance terminal are sequentially signal connected, the AD module is used for collecting signals of the thermistor, the CPU module is used for judging whether the voltage exceeds the rated voltage based on the signals by simulating the overvoltage threshold, and the operation and maintenance terminal is used for displaying the alarm signal and regulating the voltage.

[0023] The electrical quantity is digitized through sampling of the AD module; the CPU module realizes local data analysis and control decision; and the operation and maintenance terminal provides man-machine interaction and system integration interface. The overvoltage alarm signal circuit realizes the upgrade from simple hardware protection to intelligent management through the introduction of the digital architecture of AD sampling, CPU decision and operation and maintenance terminal interaction.

[0024] Preferably, the overvoltage alarm signal circuit further comprises a communication module, and the CPU module and the operation and maintenance terminal are connected through the communication module.

[0025] The CPU and the operation and maintenance terminal are connected through the communication module, real-time monitoring at a long distance is supported, sound and light / text alarm is triggered quickly when the voltage is abnormal, the safety of equipment is ensured, voltage data and event logs are automatically recorded, and traceability analysis is facilitated, multiple devices are uniformly accessed, operation and maintenance operation is simplified, and management efficiency is improved.

[0026] Preferably, the sampling frequency of the AD module is 80 points per cycle.

[0027] The configuration not only guarantees the rapidity and accuracy of overvoltage protection, but also provides sampling data support for voltage state evaluation.

[0028] Second embodiment The second aspect of the application provides a reversible power distribution terminal remote signaling overvoltage protection method, which is applied to the reversible power distribution terminal remote signaling overvoltage protection device of any one of the above, and comprises the following steps of: An input voltage module inputs a voltage; A thermistor of the overvoltage protection module dynamically regulates the voltage across a zener diode of the overvoltage protection module based on the voltage; An overvoltage alarm signal circuit obtains a voltage signal, an alarm signal and dynamically regulates the output voltage of the thermistor based on the voltage.

[0029] The thermistor and the zener diode are connected in series as a main protection unit, slow temperature control and fast voltage clamping are considered; the thermistor is reversely regulated through the alarm circuit to realize online setting of protection parameters; the whole cycle protection is changed from after-the-fact remedy to pre-prevention, in-process control and after-recovery.

[0030] Preferably, the specific steps of dynamically regulating the voltage across the zener diode by the thermistor of the overvoltage protection module based on the voltage further comprise the following steps of: If the voltage is DC 24V, the resistance value of the thermistor is 1kΩ, and the voltage across the voltage regulator diode of the overvoltage protection module is regulated to 24V. If the voltage is greater than DC 24V, the resistance value of the thermistor switches to 10MΩ, and the overvoltage protection module is in a high resistance state.

[0031] The series dynamic regulation structure of the thermistor and the voltage regulator diode breaks through the efficiency bottleneck of traditional parallel protection; direct voltage threshold driving is used instead of temperature feedback to achieve faster response; special thermistor materials with fast resistance switching characteristics and long-term stability are developed to solve the problem of fatigue damage caused by frequent switching. This method has been verified in practical engineering and is particularly suitable for intelligent power distribution terminals with strict requirements on power continuity, safety, and energy efficiency, and is an important technical support for building new power systems.

[0032] Preferably, the step of obtaining the voltage signal, the alarm signal, and the output voltage of the dynamically regulated thermistor based on the voltage through the overvoltage alarm signal loop further comprises: The AD module based on the voltage through the overvoltage alarm signal loop acquires the current analog signal; The CPU module based on the current analog signal through the overvoltage alarm signal loop acquires the input voltage abnormality by simulating the overvoltage threshold; The operation and maintenance terminal based on the voltage abnormality displays and inputs the regulated voltage to regulate the thermistor.

[0033] The analog signal of the thermistor is converted to digital quantity (typical 12-16 bit resolution), accurately reflecting voltage fluctuations; capturing small voltage deviations, eliminating temperature drift errors of analog circuits, and achieving accurate measurement of voltage values.

[0034] Preferably, the step of acquiring the input voltage abnormality by simulating the overvoltage threshold based on the current analog signal through the CPU module further comprises: Based on the current analog signal, the current mean value and the real-time sampling value of the continuous 8 sampling points are acquired, and the calculation expressions are respectively: In the formula, is the current mean value, N is the number of sampling points of the current analog signal, is the sampling index value of the current analog signal, is the sampling value of the index value i in the current analog signal; Based on the current mean value, the real-time sampling value, the preset periodic current threshold, and the sampling current threshold, the voltage abnormality Boolean value is acquired and the real-time sampling value is updated, and the calculation expression is: In the formula is a preset periodic current threshold, is a sampling current threshold, is a voltage abnormality Boolean value; Based on the voltage abnormality Boolean value, the real-time sampling value updates the voltage abnormality Boolean value, and the calculation expression is: Based on the voltage abnormality Boolean value, the input voltage abnormality condition is obtained, and the specific rules are: if the voltage abnormality Boolean value is 1, the input voltage abnormality condition is abnormal, otherwise it is normal.

[0035] The statistical mean is combined with the sliding window algorithm to realize the dual monitoring of macro trend and micro detail; the Schmidt trigger principle is used to design the hysteresis characteristic to avoid threshold boundary oscillation; all algorithm operations are completed in the CPU module without relying on cloud resources.

[0036] Preferably, based on the voltage abnormality condition, the step of displaying and inputting the voltage of the voltage regulating thermistor through the operation and maintenance terminal further comprises: If the voltage abnormality condition is abnormal, drive the pressure alarm signal to the operation and maintenance terminal, and the pressure alarm signal includes a remote signaling point; Based on the pressure alarm signal, the voltage value of the corresponding remote signaling point is updated to update the voltage across the voltage stabilizing diode.

[0037] For the first time, the remote signaling point is used as a voltage adjustment execution unit to realize plug and play protection; a lightweight algorithm is embedded in the operation and maintenance terminal without relying on cloud resources; both automatic protection function and manual intervention interface are provided to meet different scene requirements.

[0038] In the description of the present application, it should be noted that the terms "in", "out" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used. The invention is intended to facilitate the description of the application and simplify the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", etc. are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0039] It should also be noted that unless otherwise explicitly specified and limited, the terms "set", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific execution of the system and the device described above can refer to the corresponding process in the foregoing method embodiment.

[0041] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments. Even if various changes are made to the present application, if the changes belong to the scope of the claims of the present application and the equivalent technology thereof, they still fall within the protection scope of the present application.

Claims

1. A reversible power distribution terminal remote signaling overvoltage protection device, characterized by, The application relates to a DC voltage input device, which comprises the following modules: an input voltage module for inputting different DC power voltages; an overvoltage protection module for obtaining a rated voltage through conversion based on different power voltages and outputting different logic signals through a remote signaling loop based on the rated voltage, wherein the rated voltage is DC 24V; a remote signaling loop module for obtaining an alarm signal through sampling of the logic signal, wherein the input end of the remote signaling loop module is connected with the output end of the overvoltage protection module.

2. The reversible power distribution terminal remote signaling overvoltage protection device of claim 1, wherein, The overvoltage protection module comprises an overvoltage protection circuit and an overvoltage alarm signal loop, the overvoltage protection circuit is used for protecting the remote signaling loop module, the overvoltage alarm signal loop is used for obtaining an alarm signal greater than the rated voltage and realizing normal working of the remote signaling loop module through regulated voltage, the overvoltage protection circuit comprises a thermistor and a stabilizing diode, the thermistor is connected with the stabilizing diode in series and is closed with the input end and the output end of the input voltage module, and the overvoltage alarm signal loop is connected with the output end of the thermistor.

3. The reversible power distribution terminal remote signaling overvoltage protection device of claim 2, wherein, The overvoltage alarm signal loop comprises an AD module, a CPU module and an operation and maintenance terminal, the AD module, the CPU module and the operation and maintenance terminal are sequentially connected in signal, the AD module is used for collecting signals of the thermistor, the CPU module is used for judging whether the voltage exceeds the rated voltage through simulation of an overvoltage threshold based on the signals, and the operation and maintenance terminal is used for displaying the alarm signal and the regulated voltage.

4. The reversible power distribution terminal remote signaling overvoltage protection device of claim 3, wherein, The overvoltage alarm signal loop further comprises a communication module, and the CPU module and the operation and maintenance terminal are connected through the communication module.

5. The reversible power distribution terminal remote signaling overvoltage protection device of claim 3, wherein, The collection frequency of the AD module is 80 points per cycle.

6. A reversible power distribution terminal remote signaling overvoltage protection method applied to the reversible power distribution terminal remote signaling overvoltage protection device of any one of claims 1-5, characterized in that, The application relates to a DC voltage input device, which comprises the following modules: an input voltage module for inputting different DC power voltages; an overvoltage protection module for obtaining a rated voltage through conversion based on different power voltages and outputting different logic signals through a remote signaling loop based on the rated voltage, wherein the rated voltage is DC 24V; a remote signaling loop module for obtaining an alarm signal through sampling of the logic signal, wherein the input end of the remote signaling loop module is connected with the output end of the overvoltage protection module.

7. The reversible power distribution terminal remote signaling overvoltage protection method of claim 6, wherein, The overvoltage protection module comprises an overvoltage protection circuit and an overvoltage alarm signal loop, the overvoltage protection circuit is used for protecting the remote signaling loop module, the overvoltage alarm signal loop is used for obtaining an alarm signal greater than the rated voltage and realizing normal working of the remote signaling loop module through regulated voltage, the overvoltage protection circuit comprises a thermistor and a stabilizing diode, the thermistor is connected with the stabilizing diode in series and is closed with the input end and the output end of the input voltage module, and the overvoltage alarm signal loop is connected with the output end of the thermistor. The overvoltage alarm signal loop comprises an AD module, a CPU module and an operation and maintenance terminal, the AD module, the CPU module and the operation and maintenance terminal are sequentially connected in signal, the AD module is used for collecting signals of the thermistor, the CPU module is used for judging whether the voltage exceeds the rated voltage through simulation of an overvoltage threshold based on the signals, and the operation and maintenance terminal is used for displaying the alarm signal and the regulated voltage. The overvoltage alarm signal loop further comprises a communication module, and the CPU module and the operation and maintenance terminal are connected through the communication module.

8. The reversible power distribution terminal remote signaling overvoltage protection method of claim 6, wherein, The collection frequency of the AD module is 80 points per cycle. The application relates to a DC voltage input device, which comprises the following modules: an input voltage module for inputting different DC power voltages; an overvoltage protection module for obtaining a rated voltage through conversion based on different power voltages and outputting different logic signals through a remote signaling loop based on the rated voltage, wherein the rated voltage is DC 24V; 9. The reversible power distribution terminal remote signaling overvoltage protection method of claim 8, wherein, a remote signaling loop module for obtaining an alarm signal through sampling of the logic signal, wherein the input end of the remote signaling loop module is connected with the output end of the overvoltage protection module. The overvoltage protection module comprises an overvoltage protection circuit and an overvoltage alarm signal loop, the overvoltage protection circuit is used for protecting the remote signaling loop module, the overvoltage alarm signal loop is used for obtaining an alarm signal greater than the rated voltage and realizing normal working of the remote signaling loop module through regulated voltage, the overvoltage protection circuit comprises a thermistor and a stabilizing diode, the thermistor is connected with the stabilizing diode in series and is closed with the input end and the output end of the input voltage module, and the overvoltage alarm signal loop is connected with the output end of the thermistor. The overvoltage alarm signal loop comprises an AD module, a CPU module and an operation and maintenance terminal, the AD module, the CPU module and the operation and maintenance terminal are sequentially connected in signal, the AD module is used for collecting signals of the thermistor, the CPU module is used for judging whether the voltage exceeds the rated voltage through simulation of an overvoltage threshold based on the signals, and the operation and maintenance terminal is used for displaying the alarm signal and the regulated voltage. The overvoltage alarm signal loop further comprises a communication module, and the CPU module and the operation and maintenance terminal are connected through the communication module. The collection frequency of the AD module is 80 points per cycle. Based on the current analog signal, the current mean value and the real-time sampling value of 8 consecutive sampling points are obtained, and the expressions are calculated as follows: In the formula, is the current average value, N is the number of sampling points of the current analog signal, is the sampling index value of the current analog signal, is the sampling value of the current analog signal with index value i. Based on the current mean value, the real-time sampling value, the preset periodic current threshold and the sampling current threshold, the voltage abnormal Boolean value is obtained and the real-time sampling value is updated, and the expression is calculated as follows: In the formula is the preset periodic current threshold value, is the sampling current threshold value, is the voltage abnormality Boolean value; Based on the voltage abnormal Boolean value, the real-time sampling value is updated, and the expression is calculated as follows: Based on the voltage abnormal Boolean value, the input voltage abnormal situation is obtained, and the specific rules are as follows: if the voltage abnormal Boolean value is 1, the input voltage abnormal situation is abnormal, otherwise it is normal.

10. The reversible power distribution terminal remote signaling overvoltage protection method of claim 8, wherein, Based on the voltage abnormal situation, the voltage of the thermistor is adjusted through the operation and maintenance terminal, and the step further includes: If the voltage abnormal situation is abnormal, drive a pressure alarm signal to the operation and maintenance terminal, and the pressure alarm signal includes a remote signaling point; Based on the pressure alarm signal, the voltage value of the corresponding remote signaling point is updated to update the voltage across the voltage stabilizing diode.

Images