A data acquisition system for grounding resistance of transmission line tower based on Beidou technology

Abstract

The application discloses a power transmission line tower grounding resistance data acquisition system based on Beidou technology, which comprises a Beidou monitoring station, a measuring electrode, a grounding down lead and a grounding resistance, a control device is arranged in the Beidou monitoring station, a lead connecting device is arranged between the grounding down lead and the grounding resistance, and the measuring electrode comprises a voltage electrode and a current electrode; the Beidou monitoring station is used for power supply and realizes online monitoring of the grounding resistance of a high-voltage power transmission line tower; and the measuring electrode is installed at the grounding resistance of the power transmission line tower. The power transmission line tower grounding resistance data acquisition system based on the Beidou technology periodically and automatically acquires the power transmission line tower grounding resistance data and the threshold measurement lightning impulse current, without the need of on-site detection by operation and maintenance management personnel, so that the workload of the power transmission line operation and maintenance personnel is greatly reduced, and the safe operation level of the power transmission line is improved.

Description

Technical Field

[0001] This application relates to the field of grounding resistance monitoring technology, and in particular to a data acquisition system for grounding resistance of transmission line towers based on Beidou technology. Background Technology

[0002] The grounding of high-voltage transmission line towers is closely related to the safe operation of transmission lines during lightning strikes, especially in the summer when lightning is frequent. The grounding resistance of high-voltage transmission line towers can effectively guide the lightning current on the overhead lightning arrester, thereby protecting the safety of the insulators and preventing insulator flashover and faults caused by lightning strikes, thus improving the safe operation level of high-voltage transmission lines. Lightning strikes on high-voltage transmission lines include direct lightning strikes and induced lightning strikes. Because lightning current is rapidly released and possesses high energy, it needs to be quickly connected to the tower through the lightning arrester to conduct the enormous energy of the lightning impulse current to the ground, preventing the insulator strings from being affected. Due to the rapid energy release of the lightning impulse current, there are high requirements for the grounding resistance of high-voltage transmission line towers; that is, the grounding resistance of the transmission line towers cannot be too high. If the tower grounding resistance is too high, a very high voltage will be induced in the grounding resistance at the moment the lightning impulse current of tens to hundreds of kA is released, which will also cause flashover of the insulator strings. Therefore, it is necessary to regularly measure the grounding resistance of high-voltage transmission line towers to ensure that it meets the relevant national and enterprise standards. However, due to factors such as personnel patrolling the lines in central and western my country and the impact of extreme weather conditions on transmission lines, such testing is difficult. Furthermore, existing technologies use the three-electrode method to measure grounding resistance, which requires manually disconnecting the grounding lead from the tower and reconnecting it after measurement. This manual disconnection and reconnection method is unsuitable for automatic online monitoring. Therefore, this invention provides a method for monitoring the grounding resistance of transmission lines based on BeiDou technology. Summary of the Invention

[0003] This application proposes a data acquisition system for grounding resistance of transmission line towers based on BeiDou technology, which has the advantage of automatically monitoring the grounding resistance value, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this application adopts the following technical solution: a data acquisition system for grounding resistance of transmission line towers based on Beidou technology, comprising: a Beidou monitoring station, measuring electrodes, grounding down conductors and grounding resistance, wherein the Beidou monitoring station is equipped with a control device, and a lead wire connection device is provided between the grounding down conductors and the grounding resistance, and the measuring electrodes include voltage electrodes and current electrodes;

[0005] The Beidou monitoring station is used for power supply to realize online monitoring of the grounding resistance of high-voltage transmission line towers;

[0006] The measuring electrode is installed at the grounding resistance of the transmission line tower, and the power supply and detection signal circuit of the measuring electrode are connected to the Beidou monitoring station via wired connection.

[0007] Furthermore, the grounding down conductor includes an upper conductor and a lower conductor, both of which are cylindrical. The top of the upper conductor is connected to the tower, and the lower part of the upper conductor has an inclined cross-section. The upper part of the lower conductor also has an inclined cross-section. The lower part of the lower conductor is connected to a grounding resistor, which is buried underground.

[0008] Furthermore, the measuring electrode includes two lines, one of which connects the measuring electrode to the upper line via a wire, and the other of which connects the measuring electrode to the lower line via a wire. A first line switch and a second line switch are respectively connected to the two lines.

[0009] Furthermore, the lead wire connection device is located between the upper and lower wires. One end of the inclined cross-section of both the upper and lower wires extends into the lead wire connection device. The lead wire connection device includes a protective housing. A magnetic shielding box is installed inside the protective housing. A fixed first electromagnet and a movable second electromagnet are horizontally arranged inside the magnetic shielding box. The first and second electromagnets are horizontally opposite each other. A rotary motor is connected to the end of the second electromagnet away from the first electromagnet. The drive end of the rotary motor extends out of the magnetic shielding box and is connected to a contact head. The contact head is located between the inclined cross-sections of the upper and lower wires. The wires of the first and second electromagnets are connected to a control device, and an external switch is provided on the wires.

[0010] Furthermore, the contact head is frustum-shaped, has at least four sides, and the sides of the contact head are inclined surfaces. The contact head includes a conductive surface and a polished surface. The conductive surface is at least one set, and the set of conductive surfaces is symmetrical with respect to the center of the contact head. The polished surface is at least one set, and the set of polished surfaces is symmetrical with respect to the center of the contact head. The inclination angles of the conductive surface and the polished surface are consistent with the inclination angles of the inclined tangent surfaces of the upper end line and the lower end line. The contact head is a conductor.

[0011] Furthermore, the lead-connection device is internally equipped with a lightning triggering component, which includes a magnet, a first induction winding, a second induction winding, and a winding switch. The upper wire passes through the middle of the magnet. The first and second induction windings are both wound on the magnet. The magnet and the first induction winding are respectively connected to the coils of the first and second electromagnets. A winding switch is provided on the connection lines between the magnet and the first electromagnet, and between the first induction winding and the second electromagnet.

[0012] Furthermore, the contact head is provided with a piezoelectric wafer located at the conductive surface, the piezoelectric wafer is connected to the control device, and the interior of the contact head is provided with an insulating protective layer located at the piezoelectric wafer.

[0013] Furthermore, the control device is equipped with an online grounding resistance monitoring system. The online grounding resistance monitoring system periodically issues detection commands to the control device, and the relevant data is transmitted back to the online grounding resistance monitoring system for data processing.

[0014] Furthermore, the online grounding resistance monitoring system performs a secondary retest of the monitoring results, following these steps:

[0015] If the detected grounding resistance data exceeds the specified range, a second test is performed. If the test result is within the normal grounding resistance range, it is sent to the transmission line operation and maintenance personnel for archiving via a short message. If the second test result is still abnormal, an abnormal test result alarm message is sent through the BeiDou fusion system, prompting the operation and maintenance personnel to handle the grounding resistance in a timely manner.

[0016] Furthermore, it also includes an online monitoring and control system for lightning impulse current, which automatically monitors the lightning impulse current at the grounding electrode, using the following method:

[0017] If the monitoring voltage signal of the lightning impulse current exceeds the set threshold, the lightning current signal will be recorded and uploaded to the online grounding resistance monitoring system, and then sent to the transmission line operation and maintenance personnel via short message through the Beidou fusion system.

[0018] 1. This application provides a data acquisition system for grounding resistance of transmission line towers based on Beidou technology. By periodically and automatically collecting grounding resistance data of transmission line towers and measuring lightning impulse current at thresholds, it eliminates the need for maintenance personnel to conduct on-site inspections, greatly reducing the workload of transmission line maintenance personnel and improving the safe operation level of transmission lines.

[0019] 2. This application provides a data acquisition system for grounding resistance of transmission line towers based on Beidou technology. By designing the grounding down conductor as a two-section structure with an upper and lower end wire, and using a contact head to connect the upper and lower end wires, the contact head moves relative to the upper and lower end wires through the attraction and repulsion forces of the magnetic shielding box and the first electromagnet. In conjunction with a rotating motor, the polished surface of the contact head is rotated to contact the upper and lower end wires, thereby polishing the inclined cut surfaces of the upper and lower end wires, reducing the corrosion of the inclined cut surfaces of the upper and lower end wires, thereby reducing the contact impedance between the contact head and the upper and lower end wires, which is beneficial to the dispersion of lightning current to the ground.

[0020] 3. This application provides a data acquisition system for grounding resistance of transmission line towers based on Beidou technology. By using a magnet to induce current in the second induction winding using the magnetic field induced by lightning current, the induced current is then led to the first and second electromagnets. By reasonably setting the current direction of the first and second electromagnets, the first electromagnet repels the second electromagnet, causing the contact head to move towards the side of the grounding lead, increasing the contact pressure between the conductive surface and the upper and lower leads, thereby increasing the contact area between the conductive surface and the upper and lower leads, and further reducing the contact impedance between the contact head and the grounding lead. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0022] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the lead wire connection device of the present invention;

[0025] Figure 3 This is a side view of the contact head of the present invention;

[0026] Figure 4 This is a flowchart of the grounding resistance monitoring process of the present invention;

[0027] Figure 5 This is a flowchart of the lightning impulse current monitoring process of the present invention.

[0028] In the diagram: 1. Measuring electrode; 101. First circuit switch; 102. Second circuit switch; 2. Control device; 3. Grounding lead; 301. Upper wire; 302. Lower wire; 4. Grounding resistor; 5. Lead connection device; 501. Protective enclosure; 502. Magnetic shielding box; 503. First electromagnet; 504. Second electromagnet; 505. External power switch; 6. Contact head; 601. Conductive surface; 602. Polished surface; 7. Rotary motor; 8. Lightning triggering component; 801. Magnet; 802. First induction winding; 803. Second induction winding; 804. Winding switch; 9. Piezoelectric crystal. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] Example 1

[0031] Please see Figure 1 A data acquisition system for grounding resistance of transmission line towers based on Beidou technology includes: a Beidou monitoring station, a control device 2, a grounding down conductor 3 and a grounding resistor 4. The Beidou monitoring station is equipped with a measuring electrode 1, and a lead wire connection device 5 is provided between the grounding down conductor 3 and the grounding resistor 4. The measuring electrode 1 includes a voltage electrode and a current electrode.

[0032] The Beidou monitoring station is used for power supply to realize online monitoring of the grounding resistance of high-voltage transmission line towers;

[0033] Measuring electrode 1 is installed at the grounding resistance 4 of the transmission line tower. The power supply and detection signal circuit of measuring electrode 1 are connected to the Beidou monitoring station via wired connection.

[0034] The measuring electrode 1 is equipped with an online grounding resistance monitoring system. The online grounding resistance monitoring system periodically issues detection commands to the measuring electrode 1, and the relevant data is transmitted back to the online grounding resistance monitoring system for data processing.

[0035] The grounding down conductor 3 includes an upper conductor 301 and a lower conductor 302, both of which are cylindrical. In the prior art, the grounding down conductor 3 can be flat or cylindrical and its shape is easily variable. However, in this application, the grounding down conductor 3 is made into a cylindrical shape and has high rigidity. This application is more suitable for pile foundation towers. Pile foundation towers do not have grounding down conductors; instead, the pile foundation of the tower is directly connected to the grounding resistor 4 and then wrapped together with concrete. However, this directly leads to the problem that the grounding down conductor 3 cannot be disconnected, so the resistance value of the grounding resistor 4 cannot be measured using the three-electrode method. The result value measured using the clamp meter method has a large error. Therefore, in this application, the grounding down conductor 3 is designed as a two-section structure with an upper conductor 301 and a lower conductor 302, and connected using a lead wire connection device 5. Therefore, the top of the upper line 301 is connected to the tower, the lower end of the upper line 301 is an inclined section, the upper end of the lower line 302 is also an inclined section, and the lower end of the lower line 302 is connected to the grounding resistor 4, which is buried underground.

[0036] See appendix Figure 1The measuring electrode 1 includes two lines. One line connects the measuring electrode 1 to the upper line 301 via a wire, and the other line connects the measuring electrode 1 to the lower line 302 via a wire. A first circuit switch 101 and a second circuit switch 102 are connected to the two lines respectively. When the first circuit switch 101 is closed and the second circuit switch 102 is open, the measuring electrode 1 can measure the resistance between the upper line 301 and the grounding resistor 4, including the resistance at the connection between the upper line 301 and the lower line 302. When the first circuit switch 101 is open and the second circuit switch 102 is closed, only the resistance of the grounding resistor 4 is measured.

[0037] The lead wire connection device 5 is located between the upper end wire 301 and the lower end wire 302. The lead wire connection device 5 includes a protective housing 501. One end of the inclined cross-section of both the upper end wire 301 and the lower end wire 302 extends into the lead wire connection device 5. A magnetic shielding box 502 is installed inside the protective housing 501. A first electromagnet 503 and a second electromagnet 504 are horizontally arranged inside the magnetic shielding box 502, facing each other horizontally. A rotary motor 7 is connected to the end of the second electromagnet 504 furthest from the first electromagnet 503. The drive end of the rotary motor 7 extends out of the magnetic shielding box 502 and is connected to a contact head 6. The contact head 6 is located between the inclined cross-sections of the upper end wire 301 and the lower end wire 302. Figure 2 As can be seen, the contact head 6 is connected between the upper wire 301 and the lower wire 302, and the lightning current or detection current flows through the upper wire 301, the contact head 6, and the lower wire 302. The wires of the first electromagnet 503 and the second electromagnet 504 are connected to the measuring electrode 1, and an external switch 505 is provided on the wires. In this application, by controlling the direction and magnitude of the current to the first electromagnet 503 and the second electromagnet 504 in the control box, the relative positions of the second electromagnet 504 and the first electromagnet 503 can be controlled respectively. The first electromagnet 503 is fixed inside the magnetic shielding box 502, and the second electromagnet 504 moves in the magnetic shielding box 502. When the current flowing through the first electromagnet 503 and the second electromagnet 504 causes the induced magnetic fields generated by the first electromagnet 503 and the second electromagnet 504 to be opposite in direction, the first electromagnet 503 and the second electromagnet 504 repel each other, thereby causing the second electromagnet 504 to move to the outside of the magnetic shielding box 502. The second electromagnet 504 pushes the contact head 6 to move along the inclined cross-section of the upper end line 301 and the lower end line 302 through the rotary motor 7, thereby increasing the contact pressure between the contact head 6 and the upper end line 301 and the lower end line 302. See Appendix Figure 2 and attached Figure 3The contact head 6 is frustum-shaped and has at least four sides. The contact head 6 includes a conductive surface 601 and a polished surface 602. There is at least one set of conductive surfaces 601, and the set of conductive surfaces 601 is symmetrical with respect to the center of the contact head 6. There is at least one set of polished surfaces 602, and the set of polished surfaces 602 is symmetrical with respect to the center of the contact head 6. The inclination angles of the conductive surfaces 601 and the polished surfaces 602 are consistent with the inclination angles of the inclined cross-sections of the upper end line 301 and the lower end line 302. The contact head 6 is a conductor. Because the surfaces of the upper wire 301, lower wire 302, and contact head 6 are rough, when the contact pressure increases, the contact area between the conductive surface 601 and the upper wire 301 and lower wire 302 also increases accordingly, thereby reducing the contact impedance between the conductive surface 601 and the upper wire 301 and lower wire 302, which is beneficial for the lightning current to dissipate from the upper wire 301, contact head 6, lower wire 302, and grounding resistance 4 to the ground.

[0038] The function of the rotary motor 7 is to drive the contact head 6 to rotate, so that the contact surface between the contact head 6 and the upper end line 301 and the lower end line 302 can switch between the conductive surface 601 and the polishing surface 602. The polishing surface 602 is provided with polishing points. When the polishing surface 602 contacts the inclined cut surfaces of the upper end line 301 and the lower end line 302, and by controlling the direction of the current of the first electromagnet 503 and the second electromagnet 504, the contact head 6 can be moved, so that the polishing surface 602 contacts the inclined cut surfaces of the upper end line 301 and the lower end line 302 intermittently, thereby polishing the inclined cut surfaces of the upper end line 301 and the lower end line 302. Since a part of the upper end line 301 and the lower end line 302 are located in the ground, their corrosion is relatively faster than that of the contact head 6. Therefore, it is necessary to polish the upper end line 301 and the lower end line 302 to reduce the impedance of the contact surface, which is conducive to the flow of lightning current.

[0039] See appendix Figure 2The lead-connection device 5 is equipped with a lightning triggering component 8. The lightning triggering component 8 includes a magnet 801, a first induction winding 802, a second induction winding 803, and a winding switch 804. The upper wire 301 passes through the middle of the magnet 801. The first induction winding 802 and the second induction winding 803 are both wound on the magnet 801. The magnet 801 and the first induction winding 802 are respectively connected to the first electromagnet 503 and the second electromagnet 504. The winding switch 804 is provided on the connection line between the magnet 801 and the first electromagnet 503 and between the first induction winding 802 and the second electromagnet 504. When lightning current flows from the upper end of the upper wire 301 to the lower end, a clockwise magnetic field is generated on the magnet 801. Since the first induction winding 802 and the second induction winding 803 have the same winding direction, induced currents in the same direction are induced in the first induction winding 802 and the second induction winding 803. The induced currents in the first induction winding 802 and the second induction winding 803 are connected to the magnet 503 and the second electromagnet 504 respectively through wires and a closed winding switch 804. Furthermore, by adjusting the wiring direction, the first... The current directions of the coils of the first electromagnet 503 and the second electromagnet 504 are opposite, which makes the induced magnetic fields generated by the first electromagnet 503 and the second electromagnet 504 have opposite directions. The first electromagnet 503 repels the second electromagnet 504. The second electromagnet 504 pushes the contact head 6 to move towards the upper end line 301 and the lower end line 302 through the rotary motor 7, thereby increasing the contact pressure between the conductive surface 601 and the inclined cut surface of the upper end line 301 and the lower end line 302, thereby increasing the contact area and reducing the contact resistance.

[0040] See appendix Figure 2 A piezoelectric crystal 9 is positioned at the conductive surface 601 in the contact head 6, and is separated from the contact head by an insulating layer (not shown in the figure). The piezoelectric crystal 9 is used to detect the contact pressure between the conductive surface 601 and the upper end line 301 and the lower end line 302, and is connected to the measuring electrode 1. If the contact pressure of the piezoelectric crystal 9 is within the normal range, but the resistance value measured in the connection line between the upper end line 301 and the measuring electrode 1 is abnormal, while the resistance value measured in the connection line between the lower end line 302 and the measuring electrode 1 is normal, it indicates that the contact impedance of the upper end line 301, the contact head 6, and the lower end line 302 is abnormal, indicating that these three are damaged and need to be replaced. In this application, when detecting the grounding resistance 4, it is also necessary to detect the contact impedance between the contact head 6 and the upper end line 301 and the lower end line 302.

[0041] Example 2

[0042] Please see Figure 4 The online grounding resistance monitoring system performs a secondary retest of the monitoring results, following these steps:

[0043] If the detected grounding resistance data exceeds the specified range, a second test is performed. If the test result is within the normal grounding resistance range, it is sent to the transmission line operation and maintenance personnel for archiving via a short message. If the second test result is still abnormal, an abnormal test result alarm message is sent through the BeiDou fusion system, prompting the operation and maintenance personnel to handle the grounding resistance in a timely manner.

[0044] Example 3

[0045] Please see Figure 5 It also includes an online monitoring and control system for lightning impulse current, which automatically monitors the lightning impulse current at the grounding electrode, using the following method:

[0046] If the monitoring voltage signal of the lightning impulse current exceeds the set threshold, the lightning current signal will be recorded and uploaded to the online grounding resistance monitoring system, and then sent to the transmission line operation and maintenance personnel via short message through the Beidou fusion system.

Claims

1. A data acquisition system for grounding resistance of transmission line towers based on BeiDou technology, comprising: The Beidou monitoring station, measuring electrode (1), grounding lead (3) and grounding resistor (4) are characterized in that the Beidou monitoring station is equipped with a control device (2), a lead wire connection device (5) is provided between the grounding lead (3) and the grounding resistor (4), and the measuring electrode (1) includes a voltage electrode and a current electrode; The Beidou monitoring station is used for power supply to realize online monitoring of the grounding resistance of high-voltage transmission line towers; The measuring electrode (1) is installed at the grounding resistance (4) of the transmission line tower. The power supply and detection signal circuit of the measuring electrode (1) are connected to the Beidou monitoring station via wired connection. The grounding lead (3) includes an upper lead (301) and a lower lead (302). The top of the upper lead (301) is connected to the tower, and the lower part of the lower lead (302) is connected to the grounding resistor (4). The lead wire connection device (5) is located between the upper end wire (301) and the lower end wire (302). One end of the inclined cross-section of the upper end wire (301) and the lower end wire (302) extends into the lead wire connection device (5). The lead wire connection device (5) includes a protective housing (501). A magnetic shielding box (502) is provided inside the protective housing (501). A fixed first electromagnet (503) and a movable second electromagnet (504) are horizontally arranged inside the magnetic shielding box (502). The first electromagnet (503) The first electromagnet (503) and the second electromagnet (504) are horizontally opposite each other. The end of the second electromagnet (504) away from the first electromagnet (503) is connected to a rotary motor (7). The drive end of the rotary motor (7) extends out of the magnetic shielding box (502) and is connected to a contact head (6). The contact head (6) is located between the inclined sections of the upper end line (301) and the lower end line (302). The wires of the first electromagnet (503) and the second electromagnet (504) are connected to the control device (2), and an external switch (505) is provided on the wires. The contact head (6) is frustum-shaped, and has at least four sides, with the sides of the contact head (6) being inclined surfaces. The contact head (6) includes a conductive surface (601) and a polished surface (602). The conductive surface (601) is at least one set, and the conductive surface (601) of one set is symmetrical with respect to the center of the contact head (6). The polished surface (602) is at least one set, and the polished surface (602) of one set is symmetrical with respect to the center of the contact head (6). The inclination angles of the conductive surface (601) and the polished surface (602) are consistent with the inclination angles of the inclined cross-sections of the upper end line (301) and the lower end line (302). The contact head (6) is a conductor.

2. The data acquisition system for grounding resistance of transmission line towers based on BeiDou technology according to claim 1, characterized in that, The upper end line (301) and the lower end line (302) are cylindrical. The lower part of the upper end line (301) is an inclined cross-section, and the upper part of the lower end line (302) is also an inclined cross-section. The grounding resistor (4) is buried underground.

3. The data acquisition system for grounding resistance of transmission line towers based on BeiDou technology according to claim 2, characterized in that, The measuring electrode (1) includes two lines. One line connects the measuring electrode (1) to the upper line (301) via a wire, and the other line connects the measuring electrode (1) to the lower line (302) via a wire. A first line switch (101) and a second line switch (102) are connected to the two lines respectively.

4. The data acquisition system for grounding resistance of transmission line towers based on BeiDou technology according to claim 1, characterized in that, The lead wire connection device (5) is equipped with a lightning triggering component (8). The lightning triggering component (8) includes a magnet (801), a first induction winding (802), a second induction winding (803), and a winding switch (804). The upper wire (301) passes through the middle of the magnet (801). The first induction winding (802) and the second induction winding (803) are both wound on the magnet (801). The magnet (801) and the first induction winding (802) are respectively connected to the coils of the first electromagnet (503) and the second electromagnet (504). The winding switch (804) is provided on the connection line between the magnet (801) and the first electromagnet (503) and between the first induction winding (802) and the second electromagnet (504).

5. A data acquisition system for grounding resistance of transmission line towers based on BeiDou technology according to claim 1, characterized in that, The contact head (6) is provided with a piezoelectric wafer (9) located on the conductive surface (601). The piezoelectric wafer (9) is connected to the control device (2). The contact head (6) is provided with an insulating protective layer located on the piezoelectric wafer (9).

6. A data acquisition system for grounding resistance of transmission line towers based on BeiDou technology according to claim 1, characterized in that, The control device (2) is equipped with an online grounding resistance monitoring system. The online grounding resistance monitoring system periodically issues detection commands to the control device (2), and the relevant data is transmitted back to the online grounding resistance monitoring system for data processing.

7. A data acquisition system for grounding resistance of transmission line towers based on BeiDou technology according to claim 6, characterized in that, The online grounding resistance monitoring system performs a secondary retest of the monitoring results, following these steps: If the detected grounding resistance data exceeds the specified range, a second test will be conducted. If the test result is within the normal grounding resistance range, it will be sent to the transmission line operation and maintenance personnel for archiving via a short message. If the second test result is still abnormal, an alarm message for abnormal test result will be sent through the Beidou fusion system, and the operation and maintenance personnel will be prompted to deal with the grounding resistance in a timely manner.

8. A data acquisition system for grounding resistance of transmission line towers based on BeiDou technology according to claim 6, characterized in that, It also includes an online monitoring and control system for lightning impulse current, which automatically monitors the lightning impulse current at the grounding electrode, using the following method: If the monitoring voltage signal of the lightning impulse current exceeds the set threshold, the lightning current signal will be recorded and uploaded to the online grounding resistance monitoring system, and then sent to the transmission line operation and maintenance personnel via short message through the Beidou fusion system.

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