Non-intrusive line tower leakage current monitor based on AI learning

Abstract

The invention discloses a non-intrusive line tower leakage current monitor based on AI learning, and relates to the technical field of power distribution network line fault positioning, and the monitor comprises an induction coil, an amplification module, an A / D conversion module, a CPUPCA module and a liquid crystal display screen. The induction coil is connected with the amplification module, the amplification module is connected with the A / D conversion module, the A / D conversion module is connected with the CPUPCA module, and the CPUPCA module is connected with the liquid crystal display screen. The system can help an operator to quickly and accurately position a fault point, quickly isolate and remove the fault and recover normal power supply after the fault occurs, greatly improves the power supply reliability, greatly reduces the labor intensity of fault line patrol personnel, improves the working efficiency, retrieves the economic loss, comprehensively improves the operation management level of a distribution network, and is higher in popularization value.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network line fault location, and in particular to a non-intrusive line tower leakage current monitor based on AI learning. Background Art

[0002] Factors such as insulator aging, dirt accumulation and lightning strikes often lead to leakage current in line towers. Leakage current will not only increase the power loss of the line, but may also cause a series of power accidents, such as forest fires, electric shocks, equipment failures and power outages, which seriously threaten the safety and stability of the distribution network. Therefore, it is extremely important to be able to monitor the leakage current of line towers in a timely and accurate manner in real time, and to warn and discover potential faults at an early stage, which is of great significance to the safe operation of the power system.

[0003] Among the many faults that affect power supply reliability, single-phase grounding fault is the most common and serious type of fault, and its main cause is the degradation or loss of insulation performance of insulators. Due to the hidden nature of this fault, traditional technical means and equipment are difficult to accurately locate and troubleshoot the fault. Although the currently widely used fault indicators and distribution automation technologies can monitor some common short circuits and low-resistance faults, they have low recognition accuracy for single-phase grounding faults, poor equipment operation stability, and cannot provide reliable early warning functions. The fundamental reason for this limitation is that the fault generation mechanism and characteristics are unclear, signal processing technology is easily affected by external interference, the application scope of existing processing technology is limited, and it is unable to effectively deal with complex fault scenarios. These problems make it difficult for the current distribution automation system to meet the needs of efficient and accurate monitoring and early warning of single-phase grounding faults that are highly concealed and dynamic. Therefore, there is an urgent need for a non-intrusive line tower leakage current monitor based on the electromagnetic induction principle of AI learning to solve such problems. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] The present invention provides a non-intrusive line tower leakage current monitor based on AI learning to solve the problem that the existing processing technology has a limited scope of application and cannot effectively cope with complex fault scenarios.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention provides a non-intrusive line tower leakage current monitor based on AI learning, which comprises: The main control unit, the fault characteristic current capture unit, the signal processing module, the alarm unit, the power supply module and the data transmission module are characterized by: The main control unit includes: CPUPCA module, which is responsible for data calculation and analysis of the signal to determine whether there is leakage; Fault signature current capture unit, including: The induction coil is responsible for capturing electromagnetic signals, sensing the changes in the electromagnetic field caused by leakage current, and converting them into electrical signals. The amplification module includes a first amplification module and a second amplification module, which are used to amplify the electrical signal obtained by the induction coil. A narrowband filter is used to filter the collected electrical signals and remove interference signals; Signal processing module, including: The A / D conversion module is responsible for converting the amplified analog electrical signal into a digital signal. PID regulation circuit, used to control the circuit in combination with the comparator, The full-bridge circuit, composed of 4 MOS tubes, is used for the conversion of DC power supply and AC power supply. The comparator includes a first comparator and a second comparator, which is used to compare the collected signal and match it with the fault characteristic signal as a basis for triggering the alarm module. The integration circuit combines with the second amplification module to process the electrical signal. The isolation drive circuit cooperates with the full-bridge circuit and the comparator to isolate the signal.

[0007] Furthermore, the monitor also includes: Alarm unit, comprising: The leakage alarm unit will send out an alarm after identifying the fault characteristic signal. The leakage alarm will inform the operation and maintenance personnel of the fault through the LED warning light and locate the faulty tower. Liquid crystal display screen, used to display fault information and signal processing results; The power module provides power to the monitor. The main control unit and the fault characteristic current capture unit adopt a low power consumption mode (microwatt level) in the absence of faults, and switch to the working mode after detecting the fault characteristic current; The data transmission module is used to remotely send the monitored fault data to the background system or the terminal device of the operation and maintenance personnel.

[0008] Furthermore, the main control unit introduces a sleep and wake-up mechanism. It is in a low-power sleep state during normal operation, wakes up when a fault characteristic current is detected, and performs signal processing and confirmation.

[0009] Furthermore, the induction coil is connected to the amplification module, the amplification module is connected to the A / D conversion module, the A / D conversion module is connected to the CPUPCA module, and the CPUPCA module is connected to the liquid crystal display.

[0010] Furthermore, after the induction coil captures the electromagnetic signal, it sends the electromagnetic signal to the amplification module. The amplification module and the A / D conversion module are used to amplify the voltage induced by the induction coil into a signal that can be recognized by the CPUPCA module. The CPUPCA module is used to perform data calculation on the signal and make judgments based on the calculation results. The LCD display is used to display the processing results of the signal by the CPUPCA module.

[0011] Furthermore, the full-bridge circuit is connected to the induction coil, the full-bridge circuit is used to realize the conversion of DC power supply to AC power supply, the isolation drive circuit is connected to the full-bridge circuit, and the isolation drive circuit is also connected to the first comparator and the second comparator.

[0012] Furthermore, the PID regulating circuit is connected to the first comparator and the second comparator, and the PID regulating circuit is connected to the first amplifying module, and a capacitor is further connected between the PID regulating circuit and the amplifying module.

[0013] Furthermore, the first comparator and the second comparator are also connected to a second amplifying module, and an amplifier is also provided between the first comparator and the second amplifying module, and the specific model of the amplifier is LF411.

[0014] Furthermore, the first amplifying module is connected to the D / A conversion circuit and then to the CPUPCA module, the second amplifying module is connected to the integration circuit and then to the CPUPCA module, and a capacitor is connected between the integration circuit and the CPUPCA module.

[0015] Furthermore, the monitor also includes a shell, which includes a magnetic induction chip and a circuit PCB board shell, the magnetic induction chip is arranged on the circuit PCB board shell, a PCB board is arranged inside the circuit PCB board shell, the main control unit, the fault characteristic current capture unit, the signal processing module, the alarm unit, the power supply module and the data transmission module are arranged on the PCB board, a reserved data interface is arranged on the bottom surface of the circuit PCB board shell, and bayonet holes are also arranged on both sides of the bottom surface of the circuit PCB board shell, and the circuit PCB board shell is fixed to the line pole tower by stainless steel cable ties through the bayonet holes on both sides of the bottom surface.

[0016] The beneficial effects of the present invention are: The present invention adopts a non-intrusive design and can be installed and operated without power outage, which greatly reduces the impact on normal power supply. At the same time, the monitor is simple in design and supports live installation, which effectively reduces operation and maintenance costs and reduces the workload of manual inspections.

[0017] The present invention, through the combination of narrow-band filters and magnetic field sensors, can effectively capture the electromagnetic signals generated by leakage current, and filter out interference signals through an efficient signal processing module, significantly improving the accuracy of signal processing. At the same time, a low-power design is used to extend the operating time of the equipment and avoid frequent equipment replacement.

[0018] The present invention uses copper material with high conductivity to shield external electromagnetic interference, significantly improves anti-interference capability, and reduces the problem of misjudgment caused by interference signals.

[0019] The present invention can timely discover line insulation problems through fault location and real-time early warning, avoid accidents, and improve the safety and reliability of the power system.

[0020] The monitor of the present invention adopts a corrosion-resistant, waterproof and dust-proof ABS shell, can adapt to harsh external environments, supports long-term stable operation, and combined with a low-power design, the device does not require frequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a line tower leakage current monitor of the present invention; Figure 2 The figure is a circuit diagram of the line tower leakage current monitor of the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Example 1, reference Figure 1 and Figure 2 , this embodiment provides a non-intrusive line tower leakage current monitor based on AI learning, including: Main control unit, fault characteristic current capture unit, signal processing module, alarm unit, power supply module and data transmission module, wherein: The main control unit includes: CPUPCA module, which is responsible for data calculation and analysis of the signal to determine whether there is leakage; Specifically, the non-intrusive monitor is installed and operated without interrupting the power supply of the line, reducing interference with normal power supply while improving the convenience of equipment installation and maintenance. Based on the principle of electromagnetic induction, the monitor can capture and analyze the leakage current signal in the line for a long time and stably. In the absence of faults, it is in microwatt power consumption mode and wakes up and starts signal processing only when the fault characteristic current is detected, thereby improving the energy utilization efficiency and operating life of the equipment.

[0027] Fault signature current capture unit, including: The induction coil is responsible for capturing electromagnetic signals, sensing the changes in the electromagnetic field caused by leakage current, and converting them into electrical signals. The amplification module includes a first amplification module and a second amplification module, which are used to amplify the electrical signal acquired by the induction coil. A narrowband filter is used to filter the collected electrical signals and remove interference signals; Specifically, a narrowband filter is introduced and high-conductivity copper material is used on the device casing to form a shield to offset external interference magnetic fields. The leakage current signal can still be effectively captured in harsh environments, reducing the interference of high-voltage lines, external electromagnetic waves and environmental noise on signal detection.

[0028] Signal processing module, including: The A / D conversion module is responsible for converting the amplified analog electrical signal into a digital signal. PID regulation circuit, used to control the circuit in combination with the comparator, The full-bridge circuit, composed of 4 MOS tubes, is used for the conversion of DC power supply and AC power supply. The comparator includes a first comparator and a second comparator, which is used to compare the collected signal and match it with the fault characteristic signal as a basis for triggering the alarm module. The integrator circuit combines with the second amplification module to process the electrical signal. Isolation drive circuit, cooperates with full bridge circuit and comparator to isolate signal; Specifically, through the combination of induction coils and magnetic field sensors, the monitor can effectively and accurately capture tiny changes in leakage current caused by insulator aging, contamination or lightning strikes. The AI ​​learning algorithm enables the system to autonomously analyze leakage current characteristics, promptly identify potential risks in the power system, and obtain fault information in advance.

[0029] Alarm unit, comprising: The leakage alarm unit will send out an alarm after identifying the fault characteristic signal. The leakage alarm will inform the operation and maintenance personnel of the fault through the LED warning light and locate the faulty tower. Liquid crystal display screen, used to display fault information and signal processing results; The power module provides power to the monitor. The main control unit and the fault characteristic current capture unit adopt a low power consumption mode (microwatt level) in the absence of faults, and switch to the working mode after detecting the fault characteristic current; Data transmission module, used to remotely send the monitored fault data to the backend system or the terminal device of the operation and maintenance personnel; Specifically, the introduction of AI learning algorithm, combined with amplification, analog-to-digital conversion and filtering signal processing, based on PID adjustment circuit, full-bridge circuit and comparator enables the monitor to still work stably in complex electromagnetic environments.

[0030] The main control unit introduces a sleep and wake-up mechanism. It is in a low-power sleep state during normal operation. It wakes up when a fault characteristic current is detected, and performs signal processing and confirmation. The induction coil is connected to the amplification module, the amplification module is connected to the A / D conversion module, the A / D conversion module is connected to the CPUPCA module, and the CPUPCA module is connected to the liquid crystal display screen; After the induction coil captures the electromagnetic signal, it sends the electromagnetic signal to the amplification module. The amplification module and the A / D conversion module are used to amplify the voltage induced by the induction coil into a signal that can be recognized by the CPUPCA module. The CPUPCA module is used to perform data calculations on the signal and make judgments based on the calculation results. The LCD screen is used to display the processing results of the CPUPCA module on the signal. A full-bridge circuit is connected to the induction coil, and the full-bridge circuit is used to realize the conversion of a DC power supply to an AC power supply. An isolation drive circuit is connected to the full-bridge circuit, and the isolation drive circuit is also connected to a first comparator and a second comparator. A PID adjustment circuit is connected to the first comparator and the second comparator, and the PID adjustment circuit is connected to a first amplification module, and a capacitor is also connected between the PID adjustment circuit and the amplification module. The first comparator and the second comparator are also connected to the second amplification module, and an amplifier is also provided between the first comparator and the second amplification module, and the specific model of the amplifier is LF411. The first amplification module is connected to the CPUPCA module after being connected to the D / A conversion circuit, and the second amplification module is connected to the CPUPCA module after being connected to the integration circuit, and a capacitor is connected between the integration circuit and the CPUPCA module; It also includes a shell, the shell includes a magnetic induction chip and a circuit PCB board shell, the magnetic induction chip is arranged on the circuit PCB board shell, a PCB board is arranged inside the circuit PCB board shell, a main control unit, a fault characteristic current capture unit, a signal processing module, an alarm unit, a power supply module and a data transmission module are arranged on the PCB board, a reserved data interface is arranged on the bottom surface of the circuit PCB board shell, and bayonet holes are also arranged on both sides of the bottom surface of the circuit PCB board shell, and the circuit PCB board shell is fixed to the line tower by stainless steel cable ties through the bayonet holes on both sides of the bottom surface; Specifically, the monitor uses high-strength ABS material as its protective shell, which is waterproof, dustproof, and corrosion-resistant. It can operate in harsh outdoor environments for a long time with low maintenance costs.

[0031] The line tower leakage current monitor of the present invention adopts non-contact monitoring, and only needs to be fixed at the middle section of the line tower with a stainless steel tie. It is simple to install and can be installed with power on. It can capture the fault current of the fault characteristic, and is equipped with a narrow-band filter to identify whether the fault current is a power frequency current. After determining whether it is a fault characteristic, the leakage alarm sends fault alarm information to the operation and maintenance personnel through the LED alarm light prompt. The fault information can only be sent by the leakage alarm of the tower where the insulator insulation is weak, and it is unique, so as to accurately prompt and guide the operation and maintenance personnel to eliminate the fault in time; The power supply mode of the leakage monitor of the present invention is battery-powered. After installation, the main control unit is in a dormant state, and the fault characteristic current capture unit is in a low-power (uW level) working state. Once the task target is captured, the main control unit is awakened for further filtering judgment. After confirming that it is the task target, the LED alarm is activated; The closer the distance to the tower, the stronger the magnetic field strength, and the less interference from the outside world. In order to effectively collect the change of current, the line tower leakage current monitor adopts a rectangular flat structure, which is easy to install. In order to adapt to the harsh external environment, a solid ABS new material sealed waterproof box body is used, and a high-transmittance box cover is used for inspection and observation. In the present invention, the fault characteristic current capture unit is used to collect the leakage current signal of the line tower and convert it into an electrical signal. The unit can effectively detect tiny leakage current changes. According to the on-site conditions, it takes into account the current measurement range while ensuring the measurement accuracy, avoiding the magnetic saturation problem at high current, affecting the sensor operation and further affecting the system operation. The signal processing module amplifies, filters and performs analog-to-digital conversion on the captured electrical signal to improve the quality and accuracy of the signal.

[0032] In the present invention, since the line environment operation is very complex, the line tower leakage current monitor is very susceptible to interference from various factors such as surrounding high-voltage lines, electromagnetic waves and noise. The leakage current monitor and the outer shield are made of copper, a material with high conductivity, and the eddy current anti-magnetic field generated by the shielding body is used to offset the interfering magnetic field.

[0033] In the present invention, when the current monitor is installed and used, Figure 1 As shown, the line tower leakage current monitor is fixed to the middle section of the line tower with a stainless steel tie. The enlarged picture shows the current monitor. The 0 displayed on the LCD screen of the current monitor is the alarm number. A warning light is set below the LCD screen to ensure that it can accurately collect the leakage current signal. The signal processing module, data transmission module and power supply module are installed in the ABS protective shell and fixed on the tower. The power is turned on, and the monitor is debugged and calibrated. After it works normally, the leakage current data transmitted by the monitor is received and stored. The leakage current data is monitored and analyzed in real time through the data analysis software, abnormal conditions are discovered in time, and an alarm signal is issued; The monitor provided by the present invention collects electromagnetic signals through induction coils, combines multi-level signal processing modules (amplification, analog-to-digital conversion, filtering), and relies on the main control unit to analyze and judge the signals. After the fault signal is confirmed, the alarm unit will promptly issue an alarm to prompt the operation and maintenance personnel to carry out maintenance. At the same time, the entire system adopts a low-power design and can operate stably for a long time in harsh environments. In summary, the line tower leakage current monitor of the present invention has the advantages of high precision, real-time performance, high reliability, non-invasive monitoring, easy installation and maintenance-free. It can effectively monitor the leakage current of the line tower and make analysis and judgment, discover abnormal conditions in time, and send out alarm signals, so as to realize line insulation deficiency risk warning and line high ancestor fault location, eliminate safety hazards, and provide strong guarantee for the safe and stable operation of the power system.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A non-intrusive line tower leakage current monitor based on AI learning, comprising a main control unit, a fault characteristic current capture unit, a signal processing module, an alarm unit, a power supply module and a data transmission module, characterized in that: The main control unit includes: CPUPCA module, which is responsible for data calculation and analysis of the signal to determine whether there is leakage; Fault signature current capture unit, including: The induction coil is responsible for capturing electromagnetic signals, sensing the changes in the electromagnetic field caused by leakage current, and converting them into electrical signals. The amplification module includes a first amplification module and a second amplification module, which are used to amplify the electrical signal acquired by the induction coil. A narrowband filter is used to filter the collected electrical signals and remove interference signals; Signal processing module, including: The A / D conversion module is responsible for converting the amplified analog electrical signal into a digital signal. PID regulation circuit, used to control the circuit in combination with the comparator, The full-bridge circuit, composed of 4 MOS tubes, is used for the conversion of DC power supply and AC power supply. The comparator includes a first comparator and a second comparator, which is used to compare the collected signal and match it with the fault characteristic signal. The integrator circuit combines with the second amplification module to process the electrical signal. The isolation drive circuit cooperates with the full-bridge circuit and the comparator to isolate the signal.

2. According to claim 1, a non-intrusive line tower leakage current monitor based on AI learning is characterized in that: The monitor also includes: Alarm unit, comprising: The leakage alarm unit will send out an alarm after identifying the fault characteristic signal. Liquid crystal display screen, used to display fault information and signal processing results; A power module, which provides power to the monitor; The data transmission module is used to remotely send the monitored fault data to the background system or the terminal device of the operation and maintenance personnel.

3. According to claim 2, a non-intrusive line tower leakage current monitor based on AI learning is characterized in that: The main control unit introduces a sleep and wake-up mechanism. It is in a low-power sleep state during normal operation. It wakes up when a fault characteristic current is detected, and performs signal processing and confirmation.

4. The non-intrusive line tower leakage current monitor based on AI learning according to claim 3 is characterized in that: The induction coil is connected to the amplification module, the amplification module is connected to the A / D conversion module, the A / D conversion module is connected to the CPUPCA module, and the CPUPCA module is connected to the liquid crystal display screen.

5. The non-intrusive line tower leakage current monitor based on AI learning according to claim 4 is characterized in that: After the induction coil captures the electromagnetic signal, it sends the electromagnetic signal to the amplification module. The amplification module and the A / D conversion module are used to amplify the voltage induced by the induction coil into a signal that can be recognized by the CPUPCA module. The CPUPCA module is used to perform data calculation on the signal and make judgments based on the calculation results. The LCD display is used to display the processing results of the signal by the CPUPCA module.

6. The non-intrusive line tower leakage current monitor based on AI learning according to claim 5 is characterized in that: The full-bridge circuit is connected to the induction coil, and the full-bridge circuit is used to realize the conversion of DC power supply to AC power supply. The isolation drive circuit is connected to the full-bridge circuit, and the isolation drive circuit is also connected to the first comparator and the second comparator.

7. The non-intrusive line tower leakage current monitor based on AI learning according to claim 6 is characterized in that: The PID regulating circuit is connected to the first comparator and the second comparator, and the PID regulating circuit is connected to the first amplifying module. A capacitor is further connected between the PID regulating circuit and the amplifying module.

8. The non-intrusive line tower leakage current monitor based on AI learning according to claim 7 is characterized in that: The first comparator and the second comparator are also connected to a second amplification module, and an amplifier is also arranged between the first comparator and the second amplification module.

9. The non-intrusive line tower leakage current monitor based on AI learning according to claim 8, characterized in that: The first amplifying module is connected to the D / A conversion circuit and then to the CPUPCA module. The second amplifying module is connected to the integration circuit and then to the CPUPCA module. A capacitor is connected between the integration circuit and the CPUPCA module.

10. The non-intrusive line tower leakage current monitor based on AI learning according to claim 9, characterized in that: The monitor also includes a shell, which includes a magnetic induction chip and a circuit PCB board shell, the magnetic induction chip is arranged on the circuit PCB board shell, a PCB board is arranged inside the circuit PCB board shell, the main control unit, the fault characteristic current capture unit, the signal processing module, the alarm unit, the power supply module and the data transmission module are arranged on the PCB board, a reserved data interface is arranged on the bottom surface of the circuit PCB board shell, and bayonet holes are also arranged on both sides of the bottom surface of the circuit PCB board shell, and the circuit PCB board shell is fixed to the line tower by stainless steel cable ties through the bayonet holes on both sides of the bottom surface.

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