Insulation defect leakage current monitor for line tower equipment based on magnetic field type

Abstract

The utility model discloses a line tower equipment insulation defect leakage current monitor based on a magnetic field type, which relates to the technical field of power distribution network equipment monitoring and comprises a cable tie and a sealing shell, and a PCB (printed circuit board) and a battery module electrically connected with the PCB are fixed in the sealing shell. The PCB is provided with an amplification module, an A / D conversion module, a display module and a single-chip microcomputer module. The binding belt is a belt-shaped open circular ring, a groove is formed in the inner side of the binding belt, a flexible circuit board is installed in the groove, three three-axis magnetic sensors are electrically connected to the flexible circuit board at equal intervals, a lead of the flexible circuit board is electrically connected with the PCB, and the binding belt is clamped and fixed through the mounting plate and the back face of the sealing shell. The monitor can accurately monitor the leakage current condition of a line tower in real time, avoids faults caused by line hidden dangers, improves the safety and reliability of an electric power system, and is ingenious and compact in structure, convenient to install, stable in position after installation and low in later maintenance cost.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution network equipment monitoring, in particular to a magnetic field-based leakage current monitor for insulating defects of line pole and tower equipment. Background Technique

[0002] Aging, fouling, lightning strikes, etc. of electrical equipment such as insulators and lightning arresters on 10KV lines may cause leakage current in line poles and towers. The leakage current in line poles and towers is different from that in other application scenarios. The leakage current in line poles and towers will not only increase line losses, but may also trigger power accidents such as forest fires, electric shock, and fault power outages, threatening the safe and stable operation of the distribution network. Among them, single-phase grounding faults are a major factor affecting power supply reliability, and the most influential fault among them is the frequent tripping of the line caused by the insulation degradation or loss of electrical equipment such as insulators and lightning arresters, resulting in single-phase grounding faults. Such single-phase grounding faults are highly concealed, and it is difficult for existing technical means and instruments to accurately locate and eliminate them. The Chinese patent application with publication number CN119199638A proposes a non-intrusive leakage current monitor for line poles and towers based on AI learning. It uses an induction coil set in the leakage current monitor to sense the electromagnetic field change caused by the leakage current and then detect the leakage current. It can only detect the leakage current within a limited range, and its detection accuracy and reliability are not applicable to line poles and towers with a large radius. Therefore, the existing leakage current monitors for line poles and towers have low detection accuracy and poor reliability, and there is an urgent need to provide a reliable monitor that can accurately detect the leakage current of insulating defects of line pole and tower equipment. Content of the Utility Model

[0003] In order to solve the problems of low detection accuracy, poor reliability, inconvenient battery replacement, and unfavorable for staff to view in the existing leakage current monitors for line poles and towers, the utility model provides the following technical solutions.

[0004] The utility model provides a leakage current monitor for insulating defects of line pole and tower equipment based on magnetic field type, which includes a cable tie and a sealed housing. A PCB circuit board is fixed on a plurality of PCB circuit board fixing posts in the sealed housing. An amplification module, an A / D conversion module, a display module and a single-chip microcomputer module are arranged on the PCB circuit board. The amplification module, the A / D conversion module, the single-chip microcomputer module and the display module are electrically connected in sequence through the PCB circuit board. A battery module is also arranged in the sealed housing, and the battery module is electrically connected with the PCB circuit board. The cable tie is a strip-shaped open ring, and a groove is arranged on the inner side of the cable tie along the circumference. A flexible circuit board is installed in the groove, and three triaxial magnetic sensors are electrically connected to the flexible circuit board at equal intervals. The lead wire of the flexible circuit board is electrically connected with the PCB circuit board through a wire passing hole on the sealed housing. The cable tie is clamped and fixed by an installation plate and the back surface of the sealed housing. The installation plate is fixedly connected with the back surface of the sealed housing through a plurality of lower housing fixing screws.

[0005] Preferably, a Bluetooth module is further arranged on the PCB circuit board, and the Bluetooth module is electrically connected with the single-chip microcomputer module through the PCB circuit board.

[0006] Preferably, an alarm module is further arranged on the PCB circuit board, and the alarm module is electrically connected with the single-chip microcomputer module through the PCB circuit board.

[0007] Optionally, the alarm module is an LED alarm lamp.

[0008] Preferably, a solar panel is further arranged at the top end inside the sealed housing. The battery module is a rechargeable lithium battery, and the solar panel is electrically connected with the rechargeable lithium battery.

[0009] Optionally, the display module is a liquid crystal display screen.

[0010] Preferably, the amplification module includes three identical filtering and amplification circuits, and the A / D conversion module includes three identical A / D conversion circuits.

[0011] Preferably, the sealed housing includes an upper housing and a lower housing which are hermetically connected, and the wire passing hole is arranged on the lower housing.

[0012] Preferably, a horizontal accommodating part for accommodating the cable tie is arranged on the side surface of the installation plate, and the installation plate is fixedly connected with the back surface of the lower housing through a plurality of lower housing fixing screws.

[0013] Preferably, a monitor switch is further arranged outside the sealed housing, and the monitor switch is electrically connected with the PCB circuit board.

[0014] The magnetic field-based leakage current monitor for insulating defects of line pole and tower equipment provided by the present utility model arranges three three-axis magnetic field sensors around the line pole and tower to simultaneously and accurately detect the magnetic fields in the horizontal and vertical directions of the line around the line pole and tower for one week. It can effectively detect tiny leakage current changes, with accurate detection results and can adapt to the complex-structured distribution network lines. By providing a horizontal accommodation part for the cable tie to be embedded on the upper middle side of the mounting plate, the slippage between the cable tie and the mounting plate can be prevented, thereby effectively fixing the sealed housing. By providing a solar panel and a rechargeable battery, the need for staff to regularly and frequently replace the battery is avoided. By providing a Bluetooth module, it is convenient for the staff to view the monitoring information. Therefore, this application can monitor the leakage current situation of the line pole and tower in real time and accurately, avoid the occurrence of faults caused by line hidden dangers, and improve the safety and reliability of the power system. Description of the Drawings

[0015] Figure 1 It is a side cross-sectional view of the magnetic field-based leakage current monitor for insulating defects of line pole and tower equipment provided by the present utility model;

[0016] Figure 2 It is a front view of the magnetic field-based leakage current monitor for insulating defects of line pole and tower equipment provided by the present utility model;

[0017] Figure 3 It is a top view of the magnetic field-based leakage current monitor for insulating defects of line pole and tower equipment provided by the present utility model.

[0018] Description of the Reference Numerals: 1. Upper shell; 2. Lower shell; 3. Monitor switch; 4. LED alarm lamp; 5. Cable tie; 6. Liquid crystal display screen; 7. Solar panel; 8. PCB circuit board; 9. Cable tie fixing screw; 10. Rubber sealing ring; 11. PCB circuit board fixing column; 12. Lower shell fixing screw; 13. Rechargeable lithium battery; 14. Three-axis magnetic sensor; 15. Mounting plate; 16. Flexible circuit board. Detailed Embodiments

[0019] In order to better understand the above technical solutions, the following will describe the above technical solutions in detail in conjunction with the drawings in the specification and specific embodiments.

[0020] Please refer to Figures 1 - 3, this embodiment provides a magnetic field-based leakage current monitor for insulating defects of line pole and tower equipment, including a cable tie 5 and a sealed housing. The sealed housing includes an upper shell 1 and a lower shell 2 which are hermetically connected. The upper shell 1 is provided with a waterproof sealing groove, and an O-ring rubber seal 10 is arranged in the waterproof sealing groove. The lower shell 2 is provided with a waterproof protrusion adapted to the waterproof sealing groove. The sealed housing is a transparent polycarbonate resin shell. Multiple PCB circuit board fixing posts 11 in the lower shell 2 are fixed with a PCB circuit board 8. The PCB circuit board 8 is provided with an amplification module, an A / D conversion module, a display module, an alarm module, a single-chip microcomputer module, and a Bluetooth module. The amplification module, the A / D conversion module, the single-chip microcomputer module, and the display module are electrically connected in sequence through the PCB circuit board. The alarm module and the Bluetooth module are respectively electrically connected to the single-chip microcomputer module through the PCB circuit board. A solar panel 7 is arranged at the top inside the sealed housing, and a battery module is arranged at the bottom. A monitor switch 3 is arranged outside the sealed housing. The solar panel 7 is electrically connected to the battery module for charging the battery module. The monitor switch 3 and the battery module are both electrically connected to the PCB circuit board 8. The monitor switch 3 is used to control the on and off of the monitor, and the battery module is used to provide the electric energy required for the operation of the monitor.

[0021] The cable tie 5 is a strip-shaped open ring, that is, the cable tie is generally in a strip structure. When installed, it is fixed by a cable tie fixing screw 9 to form a closed-loop structure around the line pole and tower. The cable tie 5 is injection-molded from nylon material. A groove is arranged on its inner side (i.e., the side in contact with the line pole and tower) along the circumference. A circumferentially extending flexible circuit board 16 is installed in the groove. Three three-axis magnetic sensors 14 are electrically connected at equal intervals on the flexible circuit board. The flexible circuit board 16 is sealed in the groove by silicone rubber. The lead of the flexible circuit board is electrically connected to the PCB circuit board 8 through a wire passing hole on the lower shell 2. An installation plate 15 is arranged at the position opposite to the opening of the cable tie. The installation plate 15 is fixedly connected to the back of the lower shell 2 through a plurality of lower shell fixing screws 12. The cable tie part opposite to the opening is clamped and fixed by the installation plate and the back of the lower shell.

[0022] As an optional implementation manner, a horizontal accommodating part (not shown in the figure) is arranged on the side of the installation plate away from the cable tie (i.e., the surface connected to the back of the lower shell). This horizontal accommodating part is used to accommodate the cable tie embedded therein to prevent slippage between the cable tie and the installation plate. This horizontal accommodating part can be a concave structure arranged in the middle or upper part of the outer side of the installation plate, preferably arranged in the upper part of the outer side of the installation plate to better fix the sealed housing.

[0023] Specifically, the amplification module includes three identical filter and amplification circuits, and the A / D conversion module includes three identical A / D conversion circuits. Preferably, the display module is a liquid crystal display screen 6, and the alarm module is an LED alarm light 4; the battery module is a rechargeable lithium battery 13 with a capacity of 5000 mAh, which can provide a stable DC working power supply of 3.6 V and has a continuous operation time of not less than 3 years. The three-axis magnetic sensor can effectively detect minute leakage current changes, and the measured current range is 170 mA - 40 A. Through formula calculation, the relationship between the coil turns, the induced voltage, and the leakage current is determined. According to the on-site situation, while ensuring the measurement accuracy, the measurement range of the current is also taken into account to avoid the influence of magnetic saturation problems at high currents on the sensor operation and thus affect the system operation.

[0024] The working principle of the monitor is as follows:

[0025] The three parallel three-axis magnetic sensors 14 respectively convert the electromagnetic signals of the horizontal and vertical magnetic fields of the lines around the line tower captured by each of them into electrical signals, and then transmit them to their respective corresponding filter and amplification circuits for filtering and amplification processing. The amplified electrical signals are sent to their respective corresponding A / D conversion circuits for analog-to-digital conversion to convert the signals into digital signals that can be recognized by the single-chip microcomputer module. The single-chip microcomputer module performs data calculation based on the digital signals and makes judgments based on the calculation results. Finally, the judgment results are displayed through the display module. When the single-chip microcomputer module calculates and determines that there is an abnormal situation based on the digital signals, the LED light of the alarm module flashes for alarm. The display module displays whether the detection result is normal or abnormal. When the display shows abnormality, the leakage current occurrence time and the leakage current occurrence times will be displayed. In addition, the staff on the ground can communicate with the Bluetooth module through the mobile terminal at any time and read the leakage current monitor information based on the leakage monitoring APP on the mobile terminal.

[0026] The leakage current monitor for insulation defects of tower equipment based on magnetic field provided by this application uses three three-axis magnetic field sensors arranged at equal intervals around the line tower. By simultaneously detecting the magnetic fields in the horizontal and vertical directions of the lines around the line tower, it can effectively detect minute leakage current changes, and the detection results are accurate and can adapt to the complex-structured distribution network lines; the solar panel and rechargeable battery are set, avoiding the work hidden danger that the staff needs to replace the battery regularly; the Bluetooth module is set, facilitating the staff on the ground to view the detection information at any time. Therefore, this application can monitor the leakage current situation of the line tower in real time and accurately, avoid the occurrence of faults caused by hidden dangers in the line, and improve the safety and reliability of the power system. The leakage current monitor for insulation defects of tower equipment provided by this application has a clever and compact structure, is convenient to install, and is stable in position without slipping after installation, and the later maintenance cost is extremely low.

[0027] Although the preferred embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications that fall within the scope of the present utility model. Obviously, those skilled in the art can make various changes and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A magnetic field-based line tower equipment insulation defect leakage current monitor, characterized in that: The invention comprises a cable tie (5) and a sealed shell, wherein a PCB circuit board (8) is fixed on a plurality of PCB circuit board fixing columns (11) in the sealed shell, and an amplification module, an A / D conversion module, a display module and a single-chip computer module are arranged on the PCB circuit board (8), and the amplification module, the A / D conversion module, the single-chip computer module and the display module are electrically connected in sequence through the PCB circuit board (8); a battery module is also arranged in the sealed shell, and the battery module is electrically connected to the PCB circuit board (8); the cable tie (5) is a strip-shaped open ring, and a groove is arranged on the inner side of the cable tie (5) along the circumference, and a flexible circuit board (16) is installed in the groove, and three three-axis magnetic sensors (14) are electrically connected to the flexible circuit board (16) at equal intervals, and the leads of the flexible circuit board (16) are electrically connected to the PCB circuit board (8) through the wire holes on the sealed shell, and the cable tie (5) is clamped and fixed by the mounting plate (15) and the back side of the sealed shell, and the mounting plate (15) is fixedly connected to the back side of the sealed shell through a plurality of lower shell fixing screws (12).

2. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 1, characterized in that: A Bluetooth module is also provided on the PCB circuit board (8), and the Bluetooth module is electrically connected to the single-chip computer module via the PCB circuit board.

3. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 1, characterized in that: An alarm module is also provided on the PCB circuit board (8), and the alarm module is electrically connected to the single-chip computer module via the PCB circuit board (8).

4. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 3, characterized in that: The alarm module is an LED alarm light (4).

5. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 1, characterized in that: A solar panel (7) is also provided at the top end of the sealed housing, the battery module is a rechargeable lithium battery (13), and the solar panel (7) is electrically connected to the rechargeable lithium battery (13).

6. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 1, characterized in that: The display module is a liquid crystal display screen (6).

7. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 1, characterized in that: The amplification module includes three identical filtering and amplification circuits, and the A / D conversion module includes three identical A / D conversion circuits.

8. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 1, characterized in that: The sealed housing comprises an upper shell (1) and a lower shell (2) which are sealed and connected, and the wire hole is arranged on the lower shell (2).

9. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 8, characterized in that: A horizontal receiving portion for receiving the cable tie (5) is provided on the side surface of the mounting plate (15), and the mounting plate (15) is fixedly connected to the back surface of the lower shell (2) via a plurality of lower shell fixing screws (12).

10. The magnetic field-based line tower equipment insulation defect leakage current monitor according to claim 1, characterized in that: A monitor switch (3) is also provided outside the sealed housing, and the monitor switch (3) is electrically connected to the PCB circuit board (8).

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