High-voltage tower grounding resistance detection terminal free of wire removal

Abstract

The invention relates to the technical field of tower power transmission and transformation operation and maintenance, in particular to a high-voltage tower grounding resistance wire-removal-free detection terminal which comprises a detection mainframe box and four current transformers associated with the detection mainframe box. The current transformer comprises a handle portion, a positioning jaw and a functional jaw, the positioning jaw and the functional jaw are arranged on the handle portion, iron cores and windings are embedded in the positioning jaw and the functional jaw, the positioning jaw is fixedly assembled on the handle portion, the functional jaw is assembled on the handle portion in a sliding mode, and when the positioning jaw and the functional jaw are closed, the outline of an inner cavity of the positioning jaw and the functional jaw is in a kidney round shape. The functional jaw is positioned on one parallel section of the outline of the inner cavity; when the functional jaw is far away from the positioning jaw, a notch is formed in the outline of the inner cavity, and the narrower functional jaw can penetrate between the flat iron and the tower angle iron or the cement base; through-core connection and detection can be carried out on the tightly attached flat iron downlead, the device can also be matched with a cylindrical downlead, and airflow cleaning is carried out on the exposed position of the iron core before the jaw is closed each time.

Description

Technical Field

[0001] This invention relates to the field of power transmission and transformation operation and maintenance technology, specifically a high-voltage tower grounding resistance detection terminal that does not require disconnection. Background Technology

[0002] In power supply systems, the grounding device of high-voltage transmission towers is a key device to ensure lightning protection and safe operation of the lines. The resistance value of the grounding device must be measured regularly to assess its condition. Traditional measurement methods (such as the three-electrode method) require disconnecting the grounding down conductor and connecting it to the grounding electrode before testing. This operation is cumbersome, time-consuming, and labor-intensive. Furthermore, frequent disassembly and assembly of nuts can easily damage the zinc plating of the nuts. Additionally, the use of anti-theft nuts can lead to the problem of not being able to disassemble and assemble them on-site.

[0003] In recent years, grounding resistance testing technology without disconnection (or "clamp meter method") has been developed. This method uses a clamp-on current transformer to clamp the grounding down conductor of the tower and measures the power frequency or specific frequency current discharged to the ground through the tower body and overhead lightning protection wire, thereby calculating the grounding resistance. This achieves rapid measurement without disconnecting the grounding down conductor. However, when this technology is applied to the measurement of grounding down conductors of transmission towers, several special technical problems that have not been effectively solved for a long time have been encountered: the measurement space is severely limited. The grounding down conductor of transmission towers is usually a flat iron with a rectangular cross section. For mechanical stability, one side is often tightly attached to or welded to the angle steel of the tower leg. The existing symmetrical opening and closing clamp-on current transformer requires more space than the gap between the flat iron and the angle steel when the jaws are open, which makes it impossible for the jaws of the transformer to be inserted from the side and surround the conductor, making the measurement impossible. Summary of the Invention

[0004] This invention provides a high-voltage tower grounding resistance detection terminal that does not require wire removal. It can perform through-core connection and detection on tightly attached flat iron down conductors, and can also be adapted to cylindrical down conductors. Furthermore, it can perform airflow flushing on the exposed part of the iron core before each closing of the clamp.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A high-voltage tower grounding resistance detection terminal that does not require disconnection of wires, comprising: The main unit chassis and its four associated current transformers are tested. Each current transformer includes a handle and a positioning jaw and a functional jaw. Both the positioning jaw and the functional jaw are fitted with an iron core and windings. The positioning jaw is fixedly mounted on the handle, and the functional jaw is slidably mounted on the handle. When the positioning jaw and the functional jaw are closed, their inner cavity contours are oval. The functional jaw is located on one parallel segment of the inner cavity contour. When the functional jaw moves away from the positioning jaw, a gap appears in the inner cavity contour, and the narrower functional jaw can penetrate between the flat iron and the tower angle iron or cement base. A control structure is installed inside the handle to drive the functional jaw away from or towards the positioning jaw.

[0006] Optionally, on the parallel segment of the inner cavity contour, the inner wall of the positioning jaw is designed with an active magnetic pad that can slide along the direction perpendicular to the parallel segment. A passive magnetic pad is embedded in the functional jaw. The exposed arc surface of the passive magnetic pad does not exceed the plane of the inner cavity wall of the functional jaw. An elastic structure is installed in the positioning jaw to make the arc-shaped outer wall of the active magnetic pad slightly protrude from its inner cavity wall plane.

[0007] Optionally, the elastic structure includes a limiting groove formed on the parallel section of the positioning jaws, the active magnetic pad is slidably assembled in the limiting groove, and a plurality of elastic silicone bodies are fixedly installed between the active magnetic pad and the inner wall of the limiting groove, the elastic silicone bodies being columnar in design.

[0008] Optionally, the functional jaws are fixedly mounted with a first reinforcing rib, which is slidably mounted on the handle. The first reinforcing rib has multiple air jet holes, which are wider inside and narrower outside, with the narrow opening of the air jet hole facing the exposed end of the core on the functional jaws. The first reinforcing rib has an air distribution chamber, and the handle is designed with a built-in follow-up air source that inputs positive pressure air into the air distribution chamber.

[0009] Optionally, the control structure includes a trigger that rotates inside the handle, the trigger having a travel groove inside, an assembly rod hinged in the travel groove, a base fixedly installed on the outer wall of the first reinforcing rib, and the free end of the assembly rod forming a hinge relationship with the base. When the trigger rotates, the first reinforcing rib can be controlled to move away from or closer to the positioning jaws through the assembly rod.

[0010] Optionally, the built-in follow-up air source includes: a second reinforcing rib fixedly installed on the outer wall of the positioning jaws, the second reinforcing rib being fixedly installed inside the handle; a corrugated airbag, with end caps fixedly installed at both ends of the corrugated airbag, the two end caps being fixedly connected to the outer wall of the second reinforcing rib and the outer wall of the base, respectively; a flow channel opened inside the first reinforcing rib, the two ends of the flow channel being connected to the inside of the corrugated airbag and the inside of the air distribution chamber, respectively; a one-way air inlet is opened on the corrugated airbag, and the corrugated airbag is configured to output gas unidirectionally to the flow channel.

[0011] Optionally, the handle is rotatably connected to a rotating shaft, the trigger is fixedly mounted on the outer wall of the rotating shaft, the trigger has a recessed groove, the recessed groove surrounds the outside of the rotating shaft, and a torsion spring is fixedly installed between the bottom of the recessed groove and the inner wall of the handle, the torsion spring is fitted on the outside of the rotating shaft and is designed to be coaxial.

[0012] Optionally, the four current transformers are connected to the detection host box via cables of equal length. The detection host box also has a set of voltage transformers that can measure the coupling voltage between the transmission tower and the ground.

[0013] Optionally, the detection terminal further includes a signal processing unit built into the detection host chassis, which is configured to perform the following steps: receiving and synchronously acquiring the current signals of four current transformers; vector superimposing the four current signals to obtain the total leakage current; receiving the voltage value measured by the voltage transformer; and calculating the grounding resistance value of the tower using the volt-ampere method based on the total leakage current and voltage value.

[0014] This invention provides a high-voltage tower grounding resistance detection terminal that does not require disconnection, which has the following advantages compared to the prior art: I. The asymmetrical sliding structure of the positioning jaw and the functional jaw enables non-invasive current detection of flat iron leads installed in close proximity within extremely confined spaces without the need for wire removal. This invention decomposes the complete measuring jaw into a fixed positioning jaw and a sliding functional jaw. The functional jaw is designed on a key parallel segment of the oval magnetic circuit. When it is controlled to move away from the positioning jaw, it does not open symmetrically as in traditional designs, but instead creates a directional, narrowed notch on the magnetic circuit contour. This allows the tip of the functional jaw to be directly inserted into the narrow gap between the flat iron and the attached object. After its tip passes through the gap, the flat iron body can smoothly enter the pre-measurement position through the notch, and then drive the functional jaw to close, thus re-forming a complete oval high-permeability magnetic circuit designed to optimize flat iron measurement with the positioning jaw.

[0015] Second, the coordinated operation of the active and passive magnetic pads driven by the elastic structure enables a single detection terminal to perform high-precision, adaptive, and compatible measurements on grounding leads with two completely different cross-sectional shapes: rectangular flat iron and cylindrical cable.

[0016] Third, through the coordination of the corrugated airbag, flow channel, air distribution chamber, and air jet hole, when the operator squeezes the trigger to open the jaws, the corrugated airbag is stretched, its volume increases, and external air is drawn in through the one-way valve; when the trigger is released, and the jaws are ready to close under the action of the return spring, the corrugated airbag is compressed, becoming a high-pressure air source. The compressed air is transported to the air distribution chamber through the flow channel, and finally ejected at high speed from the air jet hole, which is wider on the inside and narrower on the outside, pointing towards the core mating surface; ensuring that each closure is a tight contact between the two clean core surfaces. Attached Figure Description

[0017] Figure 1 This refers to the construction drawings for flat iron and pole angle steel or cement base in the existing technology; Figure 2 This is a schematic diagram of the external three-dimensional structure of the current transformer in this invention; Figure 3 For the present invention Figure 2 Top view; Figure 4 This is a schematic diagram of the control structure in this invention; Figure 5 This is a schematic diagram showing the separation of the positioning jaws and the functional jaws in this invention; Figure 6 This is a schematic diagram of the assembly of the positioning jaws and the functional jaws in this invention; Figure 7 For the present invention Figure 6 The right view; Figure 8 For the present invention along Figure 6 Sectional view at point AA; Figure 9 This is a three-dimensional structural diagram of the assembly of the present invention; Figure 10 The circuit diagram of the double-T filter provided in this specification.

[0018] In the diagram: 1. Handle; 2. Positioning jaws; 3. Functional jaws; 4. First reinforcing rib; 5. Trigger; 6. Second reinforcing rib; 7. Stroke groove; 8. Assembly rod; 9. Corrugated airbag; 11. Rotating shaft; 12. Active magnetic guide pad; 13. Passive magnetic guide pad; 14. Flow channel; 15. Air jet; 16. Elastic silicone body; 17. Air distribution chamber; 18. Testing main unit box. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 10 This invention provides a technical solution: a high-voltage tower grounding resistance detection terminal that does not require disconnection, comprising: The main unit 18 and its four associated current transformers are tested. The current transformers include: a handle 1 and a positioning jaw 2 and a functional jaw 3 thereon. The positioning jaw 2 and the functional jaw 3 are both fitted with iron cores and windings. The positioning jaw 2 is fixedly mounted on the handle 1, and the functional jaw 3 is slidably mounted on the handle 1. When the positioning jaw 2 and the functional jaw 3 are closed, their inner cavity contours are oval. The functional jaw 3 is located on one of the parallel segments of the inner cavity contours. When the functional jaw 3 moves away from the positioning jaw 2, a gap appears in the inner cavity contours, and the narrower functional jaw 3 can penetrate between the flat iron and the tower angle iron or cement base. The handle 1 is equipped with a control structure for driving the functional jaw 3 away from or towards the positioning jaw 2.

[0021] In existing technology, the space required for the jaws to open is larger than the gap between the flat iron and the angle iron, causing the current transformer's jaws to be unable to engage and surround the conductor from the side, thus preventing measurement. Please refer to [link to relevant documentation]. Figure 1The existing technology, which involves the construction drawing of flat iron grounding down conductors, faces challenges during construction. Due to the non-uniqueness of cement bases or tower angle steel, flat irons cannot be prefabricated in batches with preset angles. During on-site bending, effective fit is difficult, leaving gaps between the flat iron and the angle steel or cement base. These gaps are insufficient for the clamps of current transformers to pass through, necessitating excavation or forceful prying during implementation. This is time-consuming, labor-intensive, and affects grounding operation. Furthermore, the only alternative is to unlock the bolts and disconnect the wire for inspection, wasting considerable time on disassembly and reassembly. In this invention, by designing the cooperation between the positioning jaw 2 and the functional jaw 3, when the positioning jaw 2 and the functional jaw 3 are closed, they can form an oval profile that facilitates current detection of the flat iron grounding lead. By designing the functional jaw 3 as a parallel segment, when the functional jaw 3 is away from the positioning jaw 2, one end of the functional jaw 3, that is, the insertion end, is narrower than the jaws of the prior art. This makes it easier for the functional jaw 3 to pass through the gap between the flat iron and the angle steel or cement base. Even if it cannot pass through smoothly, its impact or interference on the grounding lead will be reduced. At a minimum, after passing through the gap, the flat iron can enter through the notch in the inner cavity contour. At this time, the functional jaw 3 and the positioning jaw 2 form a closed oval contour, thereby improving the sensitivity and accuracy of the detection. Specifically, the cross-sectional characteristic of the flat iron is that the width is much larger than the thickness. When the current flows along the length of the flat iron, the annular magnetic field it generates also mainly spreads around the width. The long side of the oval iron core provides a near-perfect, large-area parallel contact surface for the width of the flat iron. When the width of the flat iron is close to the long side, most of the magnetic lines of force generated by the current in the flat iron can be... The magnetic flux enters the core almost vertically and efficiently, and is effectively collected, maximizing the effective magnetic coupling surface contact. Secondly, the magnetic reluctance of the air is extremely high, and the short side of the oval arc naturally transitions to the long side on the other side, forming a complete magnetic circuit. When the flat iron is placed in it, the average distance between the inner wall of the core and the surface of the flat iron is minimized, especially in the critical long side contact area, thereby optimizing the magnetic flux path. With the cooperation of the above structures, it is possible to measure the grounding resistance of the transmission tower without removing the grounding lead nut, and it is also possible to test the grounding lead of the flat iron that is in close contact with the ground.

[0022] In a preferred embodiment, the inner wall of the positioning jaw 2 is designed with an active magnetic pad 12 that can slide along a direction perpendicular to the parallel segment, located on a parallel segment of the inner cavity contour. A passive magnetic pad 13 is embedded in the functional jaw 3, and the exposed arc surface of the passive magnetic pad 13 does not exceed the plane of the inner cavity wall of the functional jaw 3. An elastic structure is installed inside the positioning jaw 2 to make the arc-shaped outer wall of the active magnetic pad 12 slightly protrude from its inner cavity wall plane. Please refer to 4 to 5. Figure 8In this embodiment, the distance between the active magnetic pad 12 and the passive magnetic pad 13 is less than the thickness of the flat iron, so that it can be used to detect specific flat irons. When the positioning jaws 2 and the functional jaws 3 are closed, the flat iron will compress the active magnetic pad 12 backward, allowing the active magnetic pad 12 to fully retract. By design, the arc-shaped outer wall of the active magnetic pad 12 can be flush with or not exceed the inner cavity wall plane, so that the specific flat iron can be stabilized in a unique position, ensuring the consistency of the magnetic circuit state. Secondly, and more importantly, by designing the cooperation between the active magnetic pad 12 and the passive magnetic pad 13, it is also possible to detect cylindrical grounding leads. When measuring a round wire, the cable forces the active magnetic pad 12 backward, compressing the elastic structure, and the arc-shaped surface of the active magnetic pad 12... The elastic structure provides adaptive bonding force to ensure good magnetic contact. Due to the backlash space, round wires of different diameters can be well accommodated. In detail, in the oval iron core, magnetic lines of force flow along the iron core ring. The parallel section is the main channel for magnetic flux conduction, with the longest path and the greatest impact. The arc-shaped edge mainly plays a conductive role. When measuring round cables, magnetic lines of force need to start from the cable, pass through the air gap and enter the iron core. Placing the active magnetic guide pad 12 on the inside of the long side can shorten the air section path most directly and effectively, reducing the magnetic resistance of the entire circuit. With the help of the elastic structure, the inner arc surface of the active magnetic guide pad 12 tightly wraps the surface of the cable, transforming the original large air gap into a multi-layer tight magnetic connection from the cable to the active magnetic guide pad 12 to the iron core, which also ensures the detection sensitivity and accuracy of the cylindrical grounding lead.

[0023] Based on the embodiment of the magnetically conductive pad, the elastic structure includes a limiting groove formed on the parallel section of the positioning jaw 2. The active magnetically conductive pad 12 is slidably assembled in the limiting groove, and a plurality of elastic silicone bodies 16 are fixedly installed between the active magnetically conductive pad 12 and the inner wall of the limiting groove. The elastic silicone bodies 16 are columnar in design. Please refer to [link to relevant documentation]. Figure 8 The elastic silicone body 16 not only provides support but also provides uniform and stable reset pressure, ensuring that the active magnetic pad 12 can closely fit the surface of round cables of different diameters within a certain range.

[0024] In a preferred embodiment, the functional jaws 3 are fixedly mounted with a first reinforcing rib 4, which is slidably mounted on the handle 1. The first reinforcing rib 4 has multiple air jet holes 15, which are wider inside and narrower outside, with the narrow opening of the air jet holes 15 facing the exposed end of the core on the functional jaws 3. An air distribution chamber 17 is formed within the first reinforcing rib 4, and the handle 1 is designed with a built-in follow-up air source for inputting positive pressure air into the air distribution chamber 17. (See [link to previous embodiment]). Figure 8The enlarged view shows that during the insertion of the functional jaw 3, it inevitably comes into contact with pollutants or interference from the field, such as dry substances like iron filings, sand, and dust. If these interfering substances appear on the core mating surface, it will lead to poor physical bonding between the two cores, introducing an unstable additional air gap in the magnetic circuit, causing the subsequent current ratio to drift, especially affecting the accuracy of small current measurements. In this embodiment, the built-in follow-up air source provides positive pressure air to the air distribution chamber 17, allowing the air to be delivered to the air jet hole 15 under positive pressure. The air jet hole 15 is used to flush the exposed part of the core with airflow, blowing away these dry pollutants and ensuring that the core is in a clean and tight state every time it is closed, so that the current transformer can be used more effectively, especially in mountainous or dry working environments.

[0025] Furthermore, the control structure includes a trigger 5 that rotates inside the handle 1. The trigger 5 has a travel groove 7 inside, and an assembly rod 8 is hinged within the travel groove 7. A base is fixedly mounted on the outer wall of the first reinforcing rib 4. The free end of the assembly rod 8 is hinged to the base. When the trigger 5 rotates, the assembly rod 8 can control the first reinforcing rib 4 to move away from or closer to the positioning jaws 2. Please refer to [link to relevant documentation]. Figure 4 In this embodiment, the mounting rod 8 serves as a transmission link. During the rotation of the trigger 5, the mounting rod 8 can drive the first reinforcing rib 4 to move outward, thereby controlling the movement of the functional jaws 3 away. The trigger 5 is also easy to control. The operator only needs to hold the trigger 5 with their hand. When the functional jaws 3 need to be opened, they can squeeze it tightly. The movement of the functional jaws 3 away is controlled by controlling the depth of the trigger 5. It is simple and efficient.

[0026] An embodiment of a built-in follow-up air source is provided. The built-in follow-up air source includes: a second reinforcing rib 6 fixedly installed on the outer wall of the positioning jaw 2, the second reinforcing rib 6 being fixedly installed inside the handle 1; a corrugated airbag 9, with end caps fixedly installed at both ends of the corrugated airbag 9, the two end caps being fixedly connected to the outer wall of the second reinforcing rib 6 and the outer wall of the base, respectively; a flow channel 14 opened inside the first reinforcing rib 4, the two ends of the flow channel 14 communicating with the interior of the corrugated airbag 9 and the interior of the air distribution chamber 17, respectively; a one-way air inlet is opened on the corrugated airbag 9, and the corrugated airbag 9 is configured to output gas unidirectionally to the flow channel 14. Please refer to [link to relevant documentation]. Figure 3 and Figure 8In this embodiment, when the functional jaw 3 moves away from the positioning jaw 2, the first reinforcing rib 4 will simultaneously drive the end cap of the corrugated airbag 9 to move, thereby changing the internal volume of the corrugated airbag 9. The change in volume generates a change in pressure, and a pressure difference appears between the internal pressure and the external pressure, thus completing the air supply or intake. When the first reinforcing rib 4 moves away, that is, when the jaws open, the volume of the corrugated airbag 9 increases and it draws in air. When the functional jaw 3 resets, the volume of the corrugated airbag 9 is compressed, which causes the gas in the corrugated airbag 9 to be transported to the air distribution chamber 17 through the flow channel 14 and output to the exposed part of the iron core through the jet hole 15, thereby cleaning the interfering objects before closing.

[0027] Furthermore, a rotating shaft 11 is rotatably connected inside the handle 1. A trigger 5 is fixedly mounted on the outer wall of the rotating shaft 11. A recessed groove is formed on the trigger 5, surrounding the outside of the rotating shaft 11. A torsion spring is fixedly installed between the bottom of the recessed groove and the inner wall of the handle 1. The torsion spring is fitted onto the outside of the rotating shaft 11 and is designed coaxially. (See also...) Figure 4 In this embodiment, the function is to reset. When the trigger 5 is screwed in, the torsion spring will twist to accumulate elastic potential energy, thereby providing power for the reset and closure of the functional jaw 3. At the same time, it ensures the closure quality of the functional jaw 3 and the positioning jaw 2 and avoids interference from external contaminants.

[0028] In summary, furthermore, the four current transformers are connected to the detection host box 18 via cables of equal length. The detection host box 18 also has a set of voltage transformers, which can measure the coupling voltage between the transmission tower and the ground.

[0029] Furthermore, the detection terminal also includes: The signal processing unit built into the detection host chassis 18 is configured to perform the following steps: The system receives and synchronously acquires current signals from four current transformers; it then performs vector superposition of the four current signals to obtain the total leakage current; it also receives the voltage value measured by the voltage transformer; based on the total leakage current and voltage value, the current transformer also has a built-in filter circuit to filter out high-order harmonic interference signals from the transmission tower, obtaining the effective voltage and current values. With the addition of a digital filtering algorithm, the measurement accuracy is further improved. The voltage-to-current ratio is obtained using the voltmeter-ammeter method, from which the grounding resistance value of the tower can be calculated.

[0030] Please see Figure 9 and Figure 10In this embodiment, the cable length of each set of current transformers is about 15 meters, ensuring that when the detection host box 18 is placed at the center of the four tower legs, one end of the current transformer cable is inserted into the detection host box 18, and the other end of the four high-precision current transformers are installed through the flat iron grounding down conductor of the transmission tower. The main purpose of the current transformer is to measure the current value from the induced current on the overhead lightning protection line of the tower to the current value discharged into the ground by the tower itself. This current passes through the flat iron grounding down conductor. At this time, the measured current values ​​on the four current transformers installed on the grounding down conductor are integrated and accumulated to obtain the current calibration value in the time domain system. Then, the coupling voltage value between the transmission tower and the ground soil is measured by the voltage transformer. The voltage-current ratio is obtained by using the volt-ampere method, and the grounding resistance value of the tower can be calculated.

[0031] Secondly Figure 10 This is a circuit diagram for a 1kHz dual-T stage filter used to remove high-order harmonic interference signals from transmission towers.

[0032] By utilizing the above-mentioned structures, it is possible to perform through-type connection and inspection of tightly attached flat iron down conductors, while also adapting to cylindrical down conductors. Furthermore, it is possible to perform airflow flushing of the exposed part of the iron core before each closing of the jaws.

[0033] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the specification and drawings can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage tower grounding resistance detection terminal that does not require disconnection, characterized in that: include: Test the main unit (18) and its four associated current transformers; The current transformer includes: The handle (1) and its positioning jaws (2) and functional jaws (3) are fitted with iron cores and windings. The positioning jaws (2) are fixedly mounted on the handle (1), and the functional jaws (3) are slidably mounted on the handle (1). When the positioning jaws (2) and functional jaws (3) are closed, their inner cavity contours are oval. The functional jaw (3) is located on one of the parallel segments of the inner cavity contour; When the functional jaw (3) is far away from the positioning jaw (2), a notch appears in the inner cavity contour, and the narrower functional jaw (3) can penetrate between the flat iron and the tower angle iron or cement base; The handle (1) is equipped with a control structure for driving the functional jaws (3) away from or closer to the positioning jaws (2).

2. The high-voltage tower grounding resistance detection terminal without disconnection as described in claim 1, characterized in that: Located on the parallel segment of the inner cavity contour, the inner cavity wall of the positioning jaw (2) is designed with an active magnetic pad (12) that can slide along the direction perpendicular to the parallel segment. The functional jaw (3) is fitted with a passive magnetic pad (13). The exposed arc surface of the passive magnetic pad (13) does not exceed the plane of the inner cavity wall of the functional jaw (3). The positioning jaw (2) is equipped with an elastic structure that makes the arc-shaped outer wall of the active magnetic pad (12) slightly protrude from the plane of its inner cavity wall.

3. The high-voltage tower grounding resistance detection terminal without disconnection as described in claim 2, characterized in that: The elastic structure includes a limiting groove opened on the parallel section of the positioning jaw (2), the active magnetic pad (12) is slidably assembled in the limiting groove, and a plurality of elastic silicone bodies (16) are fixedly installed between the active magnetic pad (12) and the inner wall of the limiting groove. The elastic silicone bodies (16) are columnar designs.

4. The high-voltage tower grounding resistance detection terminal without disconnection as described in claim 1, characterized in that: The functional jaw (3) is fixedly installed with a first reinforcing rib (4), which is slidably installed on the handle (1). The first reinforcing rib (4) has multiple air jet holes (15), which are wider inside and narrower outside, and the narrow opening of the air jet hole (15) faces the exposed end of the iron core on the functional jaw (3). The first reinforcing rib (4) has a gas distribution chamber (17), and the handle (1) is designed with a built-in follow-up air source that inputs positive pressure air into the gas distribution chamber (17).

5. The high-voltage tower grounding resistance detection terminal without disconnection as described in claim 4, characterized in that: The control structure includes a trigger (5) that rotates inside the handle (1). The trigger (5) has a stroke groove (7) inside, and an assembly rod (8) is hinged in the stroke groove (7). A base is fixedly installed on the outer wall of the first reinforcing rib (4). The free end of the assembly rod (8) is hinged to the base. When the trigger (5) rotates, the first reinforcing rib (4) can be controlled to move away from or closer to the positioning jaws (2) through the assembly rod (8).

6. The high-voltage tower grounding resistance detection terminal without disconnection as described in claim 5, characterized in that: The built-in follow-up air source includes: A second reinforcing rib (6) is fixedly installed on the outer wall of the positioning jaw (2), and the second reinforcing rib (6) is fixedly installed inside the handle (1); A corrugated airbag (9) is provided with end caps fixedly installed at both ends of the corrugated airbag (9), and the two end caps are respectively fixedly connected to the outer wall of the second reinforcing rib (6) and the outer wall of the base. A flow channel (14) is formed inside the first reinforcing rib (4), and the two ends of the flow channel (14) are respectively connected to the inside of the corrugated airbag (9) and the inside of the air distribution chamber (17); The corrugated airbag (9) has a one-way air inlet, and the corrugated airbag (9) is configured to output gas through a one-way flow channel (14).

7. The high-voltage tower grounding resistance detection terminal without disconnection as described in claim 5, characterized in that: The handle (1) is rotatably connected to a rotating shaft (11). The trigger (5) is fixedly installed on the outer wall of the rotating shaft (11). A recessed groove is provided on the trigger (5). The recessed groove surrounds the outside of the rotating shaft (11). A torsion spring is fixedly installed between the bottom of the recessed groove and the inner wall of the handle (1). The torsion spring is fitted on the outside of the rotating shaft (11) and is designed to be coaxial.

8. The high-voltage tower grounding resistance detection terminal without disconnection according to any one of claims 1-7, characterized in that: The four current transformers are connected to the detection host box (18) via cables of equal length. The detection host box (18) also has a set of voltage transformers that can measure the coupling voltage between the transmission tower and the ground.

9. The high-voltage tower grounding resistance detection terminal without disconnection as described in claim 8, characterized in that: The detection terminal also includes: The signal processing unit built into the detection host chassis (18) is configured to perform the following steps: Receive and synchronously acquire the current signals from four current transformers; The total leakage current is obtained by vector superposition of the four current signals; Receive the voltage value measured by the voltage transformer; Based on the total discharge current and voltage values, the grounding resistance value of the tower is calculated using the volt-ampere method.

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