Live line measurement device for overhead line

Abstract

The invention relates to the technical field of overhead lines, and discloses a live line measuring device for an overhead line, an electricity measuring clamp comprises a first clamp and a second clamp, the lower ends of the first clamp and the second clamp are rotatably connected, and a measuring circuit is arranged in the first clamp; the reversing assembly comprises a rotary input part and a rotary output part, the rotary output part is in transmission connection with the second clamp, the top of the insulating rod is in transmission connection with the rotary input part, the insulating rod rotates to make the inner edge of the galvanic clamp abut against the overhead line to be detected, and the rotating force of the insulating rod and the counterforce of abutting form acting force and counterforce. The acting force and the counter-acting force drive the reversing assembly to work, so that the first clamp and the second clamp are closed; the counter-acting force is directly transmitted by the tension of the overhead line to be measured, the overhead line is less stressed, transmission is not needed in the insulating rod, and the diameter can be reduced under the same strength.

Description

Technical Field

[0001] This invention relates to the technical field of overhead lines, and in particular to a live-line measuring device for overhead lines. Background Technology

[0002] In power grid operations, conventional measurement methods require personnel to be in close contact with overhead power lines to perform measurements. However, this is very inconvenient when working on medium and high voltage overhead lines, as personnel are not allowed to get too close to the overhead lines. Personnel must wear professional live-line work protective clothing and use a lift vehicle to reach the designated position before measurements can be taken. This process is cumbersome and inefficient.

[0003] Existing solutions involve connecting an insulating rod below the clamp meter to increase working height and enable ground operations. However, a satisfactory solution for ensuring the overhead line is within the clamp's range remains elusive. One approach, as disclosed in prior art (CN214503742U), involves a portable high-voltage clamp meter. This meter uses two clamps to form a locking jaw. Applying an upward force forces the overhead line into the jaw, and after data collection, it is pulled out downwards against resistance. This exerts a force perpendicular to the overhead line's direction, and the component of this force along the line's direction generates significant tensile force, potentially damaging the line. Another approach uses a sleeve with a conductive structure running from the bottom to the top of the insulating rod. Maintaining the length and strength of the insulating rod results in a thicker sleeve, making operation inconvenient.

[0004] Therefore, how to reduce the stress on overhead lines and reduce the size of measuring tools while facilitating measurement has become an urgent technical problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to reduce the stress on the cable and reduce the size of the measuring tool while facilitating measurement.

[0006] To solve the above-mentioned technical problems, the present invention provides a live-line measuring device for overhead lines, comprising: an insulating rod (13); a commutation assembly (12), the commutation assembly (12) including a rotary input component (121) and a rotary output component (122) connected by transmission, the rotary input component (121) being fixedly connected to the top end of the insulating rod; and a current-testing clamp (11), the current-testing clamp (11) including a first clamp (111) and a second clamp (112), the lower ends of the first clamp (111) and the second clamp (112) being... The first clamp (111) is provided with a measuring circuit, and the second clamp (112) is connected to the rotating output component (122). Rotating the insulating rod (13) drives the rotating input component (121) to rotate, thereby driving the rotating output component (122) to rotate, so that the first clamp (111) and the second clamp (112) swing away from each other or move closer to each other. The measuring circuit is used to measure the electrical parameters of the overhead line under test when the first clamp (111) and the second clamp (112) are closed.

[0007] In one embodiment, both the first clamp and the second clamp are provided with notches. When the first clamp and the second clamp are closed, the notches form a circular hole. When the first clamp and the second clamp are opened, they form an opening. The circular hole is used to accommodate the overhead line to be tested.

[0008] In one embodiment, the rotary input component includes a lead screw and a lead screw nut, and the rotary output component includes a first connecting rod and a second connecting rod. The first clamp and the second clamp are rotatably connected via a pivot. The pivot is rotatably connected to the top of the lead screw, which rotates along a horizontal plane and engages with the lead screw nut. One end of the first connecting rod is hinged to the lead screw nut, and the other end of the first connecting rod is hinged to the middle of the first clamp. One end of the second connecting rod is hinged to the lead screw nut, and the other end of the second connecting rod is hinged to the middle of the second clamp. An insulating rod is used to drive the lead screw to rotate, causing the lead screw nut to move up and down, so that the lead screw nut drives the first connecting rod and the second connecting rod to swing around the pivot, thereby driving the first clamp and the second clamp to open and close.

[0009] In one embodiment, the reversing assembly further includes a housing, which is fixedly connected to the first clamp. The rotary input component is a worm gear, and the rotary output component is a worm wheel. The worm wheel is fixedly connected to the bottom of the second clamp. The first clamp and the second clamp are rotatably connected via a pivot. The axis of the worm wheel is coaxial with the pivot connection. The worm gear is rotatably connected to the housing. An insulating rod is used to drive the worm gear to rotate, and the worm gear is used to drive the worm wheel to rotate, causing the second clamp to swing with the rotation of the worm wheel, thereby opening and closing the first clamp and the second clamp.

[0010] In one embodiment, the top of the insulating rod is threadedly connected to the rotary input component; the live measuring device also includes an operating head, which includes a main rod with a branch rod fixed on it, and the main rod and the branch rod are at a preset angle; when the rotary input component is removed from the top of the insulating rod, the main rod is threadedly connected to the top of the insulating rod, and the main rod and the branch rod are used to operate the disconnecting switch.

[0011] In one embodiment, the insulating rod includes a plurality of sub-rods connected in sequence by threads.

[0012] In one embodiment, a threaded sleeve is provided at the threaded connection between the insulating rod and the rotary input component or at the threaded connection between the two sub-rods. The threaded sleeve contains a set bolt and is used to reinforce the threaded connection.

[0013] In one embodiment, the measurement circuit includes an indicator light and a buzzer, which are used to indicate whether the overhead line under test is energized.

[0014] In one embodiment, the thickness of the first clamp and the second clamp is greater than or equal to the diameter of the circular hole.

[0015] In one embodiment, the end of the insulating rod is provided with an anti-slip rubber sleeve.

[0016] Compared with the prior art, the live-line measuring device for overhead lines according to an embodiment of the present invention has the following advantages: A rotational force (i.e., action force) is applied to the insulating rod. This rotational force causes the entire live measuring device, including the clamp, to rotate, bringing the inner edge of the clamp into contact with the overhead line. The overhead line then generates a reaction force. This action and reaction force activates the commutation assembly, driving the first and second clamps to close for measurement. Twisting in the opposite direction opens the clamp. The twisting force is unlikely to cause displacement at the overhead line, resulting in less tension on the line and thus reducing stress on the line. Furthermore, no other components need to be placed inside the insulating rod, eliminating concerns about internal space and allowing for a reduction in the rod's diameter. This facilitates measurement while reducing stress on the overhead line and minimizing the size of the measuring tool. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the structure of a live-line measuring device for overhead lines, as exemplarily shown in an embodiment of the present invention.

[0018] Figure 2 This is a partial schematic diagram A of a live-line measuring device for overhead lines, as exemplarily shown in an embodiment of the present invention.

[0019] Figure 3 This is another partial schematic diagram A of a live measuring device for overhead lines, as exemplarily shown in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of a current-measuring clamp for an overhead line energizing device, as exemplarily shown in an embodiment of the present invention.

[0021] Figure 5 This is a partial schematic diagram (B) of an embodiment of the present invention, illustrating a live-line measuring device for overhead lines.

[0022] Figure label: 1. Live measuring device; 11. Test clamp; 12. Reversing assembly; 13. Insulating rod; 14. Operating head; 111. First clamp; 112. Second clamp; 113. Corner transition structure; 114. Round hole; 115. Opening; 116. Indicator light; 117. Buzzer; 121. Rotary input component; 122. Rotary output component; 131. Sub-rod; 132. Threaded sleeve; 133. Anti-slip rubber sleeve; 141. Main rod; 142. Branch rod; 1211. Lead screw; 1212. Lead screw nut; 1213. Housing; 1214. Worm gear; 1221. First connecting rod; 1222. Second connecting rod; 1223. Worm wheel; 1321. Set bolt. Detailed Implementation

[0023] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0024] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0025] It is understood that the term "corner transition structure" in this application is used to refer to a rounded corner structure or a chamfered corner structure.

[0026] In power grid operations, conventional measurement methods require personnel to be in close proximity to overhead lines to conduct measurements. However, this method is extremely unsuitable for medium- and high-voltage overhead lines. Close contact with these lines is prohibited, and workers must wear specialized live-line working protective suits and use a lift vehicle to reach a designated height for measurements. This process is not only cumbersome but also inefficient.

[0027] The mainstream solution is to connect an insulating rod below the clamp meter to enable remote ground operation by raising the working height. However, there is still no ideal solution for how to conveniently bring overhead lines into the clamp measurement range.

[0028] There are two main approaches to existing technologies: one is exemplified by the portable high-voltage clamp-on power meter disclosed in CN214503742U, which uses two clamps to form a locking jaw. During operation, upward force is applied to forcibly clamp the overhead line in, and after measurement, it needs to be pulled out downwards against resistance. This process applies a force perpendicular to the overhead line's direction, and the component of this force along the line's direction can create significant tensile force, easily causing damage to the overhead line. The other approach uses a sleeve structure, with a conductive mechanism extending from the bottom to the top of the insulating rod inside. Because the insulating rod needs to balance length and strength, the sleeve is relatively thick, resulting in poor operational flexibility.

[0029] like Figure 1 As shown in the preferred embodiment of the present invention, a live measuring device 1 for overhead lines may be provided. The live measuring device 1 may include a current measuring clamp 11, a commutation assembly 12 and an insulating rod 13.

[0030] The commutation assembly 12 includes a rotary input component 121 and a rotary output component 122 connected by a transmission. The rotary input component 121 is fixedly connected to the top end of the insulating rod. The test clamp 11 includes a first clamp 111 and a second clamp 112. The lower ends of the first clamp 111 and the second clamp 112 are rotatably connected. The first clamp 111 is provided with a measuring circuit. The second clamp 112 is connected to the rotary output component 122. Rotating the insulating rod 13 drives the rotary input component 121 to rotate, thereby driving the rotary output component 122 to rotate, so that the first clamp 111 and the second clamp 112 swing away from each other or move closer to each other. The measuring circuit is used to measure the electrical parameters of the overhead line under test when the first clamp 111 and the second clamp 112 are closed.

[0031] By applying a rotational force (action force) to the insulating rod 13, the current-testing clamp 11 rotates as a whole, causing the inner edge of the current-testing clamp 11 to come into contact with the overhead line, forming a dynamic balance between action and reaction forces. This design subjects the overhead line to a local torque and the entire overhead line to tension, effectively avoiding the damage to the overhead line caused by displacement due to vertical tension and resulting in huge component forces, which is a problem in traditional solutions, and significantly reducing the stress on the overhead line.

[0032] The measuring tool employs a rotatable insulating rod 13 structure, which is a single structure requiring no other auxiliary components, thus minimizing the diameter of the measuring tool. If a hollow structure is used, there are no internal parts, allowing for a relatively thick wall while maintaining a smaller diameter. If a solid structure is used, the diameter of the insulating rod 13 can be significantly reduced while maintaining structural strength.

[0033] Furthermore, the closing and opening operations of the test clamp 11 are achieved by utilizing the characteristic that the twisting force is unlikely to cause displacement at the overhead line under test. This feature avoids the risk of displacement of the overhead line under test caused by the need for manual force application in traditional solutions, making the operation process more stable and reliable.

[0034] In existing technologies, the insulating rod 13 needs to cooperate with other components that generate relative movement, thus requiring simultaneous control of the components that generate relative displacement, resulting in low accuracy and efficiency. In contrast, the insulating rod 13 in this application is a single unit, eliminating the need for separate operation, removing concerns about accuracy, and making it more convenient to operate.

[0035] In this application, both the first clamp 111 and the second clamp 112 are provided with notches. When the first clamp 111 and the second clamp 112 are closed, the notches form a circular hole 114. When the first clamp 111 and the second clamp 112 are opened, they form an opening 115. The circular hole 114 is used to accommodate the overhead line to be tested.

[0036] In a further embodiment, a first clamp 111 and a second clamp 112 with an arc-shaped structure can also be used, with the upper ends in complete contact when the first clamp 111 and the second clamp 112 are closed.

[0037] In one embodiment of this application, the rotary input component 121 includes a lead screw 1211 and a lead screw nut 1212, and the rotary output component 122 includes a first connecting rod 1221 and a second connecting rod 1222. The first clamp 111 and the second clamp 112 are rotatably connected by a pivot, which is rotatably connected to the top of the lead screw 1211. The lead screw 1211 rotates along a horizontal plane and engages with the lead screw nut 1212. One end of the first connecting rod 1221 is hinged to the lead screw nut 1212. The other end of the first connecting rod 1221 is hinged to the middle of the first clamp 111. One end of the second connecting rod 1222 is hinged to the lead screw nut 1212, and the other end of the second connecting rod 1222 is hinged to the middle of the second clamp 112. The insulating rod 13 is used to drive the lead screw 1211 to rotate, causing the lead screw nut 1212 to move up and down, so that the lead screw nut 1212 drives the first connecting rod 1221 and the second connecting rod 1222 to swing around the pivot, thereby driving the first clamp 111 and the second clamp 112 to open and close.

[0038] The linear transmission of the lead screw nut 1212 directly drives the up-and-down movement of the first connecting rod 1221 and the second connecting rod 1222, eliminating the need for additional complex transmission components and significantly reducing the overall size of the measuring tool. This design avoids the bulkiness of traditional sleeve structures, and through the linkage between the lead screw 1211 and the pivot, it achieves precise opening and closing of the jaws, effectively reducing the tool size while ensuring measurement accuracy.

[0039] To improve stability, the first link 1221 and the second link 1222 can be arranged in an alternating manner. This alternating arrangement eliminates dead points, preventing the link structure from jamming and thus avoiding excessive compressive stress that could cause the link to yield, thereby extending its service life.

[0040] It is understood that the "middle part of the first clamp 111" and the "middle part of the second clamp 112" in this application are used to distinguish them from the pivot connection at the bottom. A gap between these points and the pivot connection is necessary to generate rotational force. The "middle part of the first clamp 111" and the "middle part of the second clamp 112" can refer to any position between the top and the bottom, and are not intended to limit the position to 50%. They can be adjusted according to the actual required size and transmission efficiency, and the adjusted solution also falls within the protection scope of this application.

[0041] In another embodiment of this application, as an alternative to the above embodiment, the reversing assembly 12 further includes a housing 1213, which is fixedly connected to the first clamp 111. The rotary input component 121 is a worm gear 1214, and the rotary output component 122 is a worm wheel 1223. The worm wheel 1223 is fixedly connected to the bottom of the second clamp 112. The first clamp 111 and the second clamp 112 are rotatably connected by a pivot. The axis of the worm wheel 1223 is coaxial with the pivot connection. The worm gear 1214 is rotatably connected to the housing 1213. The insulating rod 13 is used to drive the worm gear 1214 to rotate, and the worm gear 1214 is used to drive the worm wheel 1223 to rotate, so that the second clamp 112 swings with the rotation of the worm wheel 1223, thereby opening and closing the first clamp 111 and the second clamp 112.

[0042] The meshing transmission characteristics of the worm gear 1214 and worm wheel 1223 ensure that the rotational input force (such as the rotation of the insulating rod 13) can be efficiently converted into driving torque. At the same time, through the linkage between the worm wheel 1223 and the second clamp 112, the swing drive of the second clamp 112 is realized, making the closing action of the first clamp 111 and the second clamp 112 precise and controllable. This design can maintain a high-precision opening and closing response even under complex working conditions (such as the dynamic deformation of the overhead line under test).

[0043] The self-locking characteristics of the worm gear 1214 and worm wheel 1223 ensure that the jaws can close stably under the action of rotational input force, thus improving safety.

[0044] It is understandable that the worm gear 1223 can be directly fixed at the second tooth, or the assembly distance and transmission ratio can be adjusted by means of other structures (such as gears).

[0045] Before and after the measurement operation, there are situations where it is necessary to switch the power on and off. Therefore, in one embodiment of this application, the top of the insulating rod 13 is threadedly connected to the rotary input component 121. The live measuring device 1 also includes an operating head 14, which includes a main rod 141 and a branch rod 142 fixed on the main rod 141. The main rod 141 and the branch rod 142 are at a preset angle. When the rotary input component 121 is removed from the top of the insulating rod 13, the main rod 141 is threadedly connected to the top of the insulating rod 13. The main rod 141 and the branch rod 142 are used to operate the isolating switch.

[0046] By introducing the operating head 14, the branch 142 structure of the operating head 14 can generate an upward or downward force, so it can be used to operate the disconnecting switch. Since it is set above the insulating rod 13, there is no need to consider insulation issues.

[0047] Furthermore, due to the presence of the insulating rod 13, there is no need to reduce the strength of the operating head 14 for the sake of insulation. Even if the operating head 14 is made of conductive metal material, it will not cause leakage problems.

[0048] In one embodiment, the insulating rod 13 includes a plurality of sub-rods 131 connected in sequence by threads.

[0049] The insulating rod 13 is configured as a threaded connection assembly structure, which makes the length of the insulating rod 13 adjustable. By increasing or decreasing the number of sub-rods 131 or adjusting the thread engagement length between sub-rods 131, it can be adapted to the length requirements of different working scenarios, making it highly versatile.

[0050] After disassembly, the sub-rod 131 is small in size and light in weight, making it easy to store and transport, thus solving the problem of inconvenience in carrying the integral insulating rod 13. Furthermore, the threaded connection structure is mature, making disassembly and assembly convenient. If any section of the sub-rod 131 is damaged in the future, it can be replaced individually, reducing maintenance costs.

[0051] In another embodiment of this application, a threaded sleeve 132 is provided at the threaded connection between the insulating rod 13 and the rotary input component 121 or at the threaded connection between the two sub-rods 131. The threaded sleeve 132 has a set bolt 1321 inside it and is used to reinforce the threaded connection.

[0052] The set bolt 1321 tightens against the threaded mating surface, forming an additional fixing force, effectively suppressing thread loosening caused by vibration and repeated stress during use, and ensuring operational safety. At the same time, the threaded sleeve 132 wraps around the connection, preventing external impacts and wear from directly affecting the threads of the rod 131 or the rotary input component 121, thus extending the service life of the threads.

[0053] Understandably, to facilitate quick disassembly, the set bolt 1321 can be a hand-tightening nut with anti-slip texture, which improves the practicality of the live measuring device 1.

[0054] In one embodiment of this application, the diameter of the threaded connection of the sub-rod 131 at the threaded connection is larger than the diameter of other parts of the sub-rod 131. The increased diameter increases the amount of material used at the connection, improves the tensile strength and torque limit, and can adapt to higher intensity operating loads.

[0055] The local thickening design makes force transmission smoother, avoids stress concentration at the beginning of the thread, and further enhances the structural stability of the connection.

[0056] The combination of these embodiments retains the core advantages of adjustable length and portability, while the inherent shortcomings of threaded connections being prone to loosening and lacking strength are solved through reinforced and thickened designs, making them both easy to use and durable.

[0057] In one embodiment, the measurement circuit includes an indicator light 116 and a buzzer 117, which are used to indicate whether the overhead line under test is energized. The indicator light 116 and the buzzer 117 form a dual indication mode of visual and auditory perception, which can quickly obtain the energized status of the overhead line under test even in complex environments such as strong light and noise, and avoid misjudgment.

[0058] Moreover, no additional voltage testing tools are needed; live-line testing can be completed simultaneously before measurement, reducing work steps and improving overall efficiency.

[0059] In one embodiment, the thickness of the first clamp 111 and the second clamp 112 is greater than or equal to the diameter of the circular hole 114. Because the thickness is greater than the diameter of the circular hole 114, the first clamp 111 and the second clamp 112 have a longer lever arm at the edge of the overhead line to be tested. When the torque transmitted from the insulating rod 13 remains unchanged, since the surface pressure is inversely proportional to the lever arm, the lever arm becomes longer and the surface pressure becomes smaller, which reduces the damage to the cable sheath.

[0060] The increased thickness of the clamp body extends the force arm, reducing surface pressure while maintaining the same torque. Furthermore, a corner transition structure 113 can be added at the edge of the circular hole, increasing the contact surface. These two elements work together to significantly reduce the likelihood of damage to the sheath of the overhead line under test. While protecting the overhead line, the effective contact between the clamp body and the line remains unchanged, ensuring the accuracy of the measurement data. The corner transition structure 113 can be a rounded corner or a chamfer.

[0061] In one embodiment of this application, an anti-slip rubber sleeve 133 is provided at the end of the insulating rod 13. The anti-slip rubber sleeve 133 increases the friction between the hand and the insulating rod 13, effectively preventing the insulating rod 13 from shaking or falling off due to slippage during operation, thus avoiding operational errors. The rubber sleeve is made of soft material, which can relieve hand fatigue from prolonged holding and improve the ease of operation. The anti-slip rubber sleeve 133 also has a certain degree of insulation, which can further isolate the potential current conduction between the hand and the end of the insulating rod 13, supplementing safety protection.

[0062] This invention provides a high-precision live-line testing device driven by rotational force. Its operation is as follows: A rotary input component 121 (taking a lead screw 1211 and nut structure as an example) is installed at the top of the insulating rod 13. The operator applies torque by rotating the insulating rod 13, causing the lead screw 1211 to rotate. The lead screw and nut 1212 drive the first connecting rod 1221 and the second connecting rod 1222 to move up and down, thereby driving the opening and closing of the first clamp 111 and the second clamp 112. The threaded connection between the lead screw 1211 of the rotary input component 121 and the insulating rod 13 is reinforced by a threaded sleeve 132 to ensure structural stability. The branch 142 structure of the operating head 14 is located above the insulating rod 13 and can generate a vertical force for operating the disconnecting switch, avoiding insulation problems. The closing and opening of the testing clamp 11 is precisely controlled through linkage, and the rotational force is efficiently converted into driving torque through the worm gear 1214 and worm wheel 1223 transmission, achieving high-precision response. The measuring circuit integrates indicator light 116 and buzzer 117 to provide real-time feedback on the energized status of the overhead line under test, improving work efficiency. Anti-slip rubber sleeves 133 enhance the friction between the hand and the insulating rod 13, preventing wobbling and slippage, balancing safety and convenience. The entire device adopts a detachable sub-rod 131 structure; the length can be adjusted by increasing or decreasing the number of sub-rods 131 or adjusting the thread engagement length, combining versatility and portability. Furthermore, the threaded reinforcement and thickening design improves connection strength, solving the problems of loose threads and insufficient strength in traditional solutions.

[0063] This technology achieves multi-dimensional optimization through structural innovation: the rotational force-driven linkage design significantly reduces operational complexity and improves operational stability. The reinforced and thickened design at the threaded connection effectively enhances structural durability, meeting the demands of high-intensity operations. The integrated measurement circuitry and anti-slip rubber sleeve 133 balance safety and practicality, reducing operational steps and improving efficiency. The rotatable insulating rod 13 structure avoids the bulkiness of traditional sleeves, while its hollow / solid structure allows for flexible size adjustment to meet the needs of different scenarios.

[0064] The technical benefits are reflected in: achieving high-precision, low-error closed-loop control, avoiding the risk of displacement of the overhead line under test caused by manual force application in traditional solutions; improving equipment versatility through an adjustable length design, overcoming the limitations of traditional fixed devices; significantly improving the reliability of threaded connections and extending service life through a reinforced structure; reducing operation steps and improving overall efficiency through an integrated design; and combining anti-slip rubber sleeve 133 with insulation functions to enhance operational safety. This solution achieves a balance between lightweight, portability, safety, and durability while ensuring measurement accuracy, making it suitable for high-voltage overhead line testing scenarios and possessing significant technical advantages and practical application value.

[0065] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A live-line measuring device for overhead lines, characterized in that The utility model relates to an electric parameter measuring device for overhead line, which comprises: an insulating rod (13); a reversing assembly (12) comprising a transmission-connected rotary input (121) and a rotary output (122), the rotary input (121) being fixedly connected with the top end of the insulating rod; a test clamp (11) comprising a first clamp (111) and a second clamp (112), the lower ends of the first clamp (111) and the second clamp (112) being pivotally connected, a measuring circuit being arranged in the first clamp (111), the second clamp (112) being connected with the rotary output (122); rotating the insulating rod (13) drives the rotary input (121) to rotate, thereby driving the rotary output (122) to rotate, so that the first clamp (111) and the second clamp (112) swing away from or close to each other, and the measuring circuit is used for measuring the electric parameters of the overhead line to be measured when the first clamp (111) and the second clamp (112) are closed.

2. The device for measuring electric charge according to claim 1, characterized in that, The first clamp (111) and the second clamp (112) are each provided with a notch, the notches form a circular hole (114) when the first clamp (111) and the second clamp (112) are closed, and the first clamp (111) and the second clamp (112) form an opening (115) when they are opened, and the circular hole (114) is used for accommodating the overhead line to be measured.

3. The device of claim 1, wherein, The rotary input (121) comprises a screw rod (1211) and a screw nut (1212), the rotary output (122) comprises a first connecting rod (1221) and a second connecting rod (1222), the first clamp (111) and the second clamp (112) are pivotally connected through a pivot; the pivot is pivotally connected with the top of the screw rod (1211), the screw rod (1211) rotates along the horizontal plane, and the screw rod (1211) cooperates with the screw nut (1212); one end of the first connecting rod (1221) is hingedly connected with the screw nut (1212), the other end of the first connecting rod (1221) is hingedly connected with the middle part of the first clamp (111), one end of the second connecting rod (1222) is hingedly connected with the screw nut (1212), and the other end of the second connecting rod (1222) is hingedly connected with the middle part of the second clamp (112); the insulating rod (13) drives the screw rod (1211) to rotate, thereby driving the screw nut (1212) to move up and down, and the screw nut (1212) drives the first connecting rod (1221) and the second connecting rod (1222) to swing around the pivot, so as to drive the first clamp (111) and the second clamp (112) to open and close.

4. The device of claim 1, wherein, The reversing assembly (12) further includes a housing (1213), which is fixedly connected to the first clamp (111). The rotary input component (121) is a worm (1214), and the rotary output component (122) is a worm wheel (1223). The worm wheel (1223) is fixedly connected to the bottom of the second clamp (112). The first clamp (111) and the second clamp (112) are rotatably connected by a pivot. The axis of the worm wheel (1223) is coaxial with the pivot. The worm (1214) is rotatably connected to the housing (1213). The insulating rod (13) is used to drive the worm (1214) to rotate, and the worm (1214) is used to drive the worm wheel (1223) to rotate, so that the second clamp (112) swings with the rotation of the worm wheel (1223), so that the first clamp (111) and the second clamp (112) open and close.

5. The device of claim 1, wherein, The top of the insulating rod (13) is threadedly connected to the rotary input component (121); The live measuring device (1) further includes an operating head (14), the operating head (14) includes a main rod (141), a branch rod (142) is fixed on the main rod (141), and the main rod (141) and the branch rod (142) are at a preset angle; When the rotary input (121) is removed from the top of the insulating rod (13), the main rod (141) is threaded to the top of the insulating rod (13), and the main rod (141) and the branch rod (142) are used to operate the disconnecting switch.

6. The device of claim 5, wherein, The insulating rod (13) includes a plurality of sub-rods (131) connected in sequence by threads.

7. The device of claim 6, wherein the device is configured to measure the charge of the object by, A threaded sleeve (132) is provided at the threaded connection between the insulating rod (13) and the rotary input component (121) or at the threaded connection between the two sub-rods (131). The threaded sleeve (132) contains a set bolt (1321) and is used to reinforce the threaded connection.

8. The device of claim 1, wherein, The measuring circuit includes an indicator light (116) and a buzzer (117), which are used to indicate whether the overhead line under test is energized.

9. The device of claim 2, wherein, The thickness of the first clamp (111) and the second clamp (112) is greater than or equal to the diameter of the circular hole (114).

10. The device of claim 1, wherein, The end of the insulating rod (13) is provided with an anti-slip rubber sleeve (133).

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