Device and system for measuring grounding current of end screen of high-voltage bushing

Abstract

A high-voltage bushing tap grounding current measuring device provided by the present invention comprises a conductive connecting rod, a housing and a grounding wire, the conductive connecting rod is provided with a connecting contact, the connecting contact is used for connecting a leading-out terminal, the connecting contact comprises a plurality of elastic clamping jaws, the elastic clamping jaws are distributed at equal intervals around the circumferential direction of the conductive connecting rod, and the elastic clamping jaws have free ends. The free end of the elastic clamping jaw is enclosed to form a clamping cavity which can be elastically opened and closed, and the leading-out terminal is clamped in the clamping cavity; the conductive connecting rod is sleeved with the cover shell, the cover shell is connected with the sleeve end screen, the cover shell is provided with a wire passing hole, a wire harness tightening assembly is arranged at the wire passing hole, and one end of the grounding wire penetrates through the wire passing hole and the wire harness tightening assembly to be connected with the conductive connecting rod. The high-voltage bushing tap grounding current measuring device disclosed by the invention can realize reliable connection of the leading-out terminal and ensure the stability of measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power technology, and particularly relates to a measuring device for the grounding current of the HV bushing end screen and a measuring system for the grounding current of the HV bushing end screen. Background Art

[0002] During the operation of power equipment, the accurate measurement of the grounding current of the bushing end screen is a key means to evaluate the insulation state of the HV bushing. In the related art, most measuring devices are connected to the lead terminal of the bushing end screen through mechanical contact means such as metal clamps to obtain the current signal in the grounding loop, and then analyze the insulation performance of the bushing. However, due to the long-term operation of power equipment under complex working conditions, factors such as mechanical vibration and temperature change will cause the contact resistance at the connection interface to fluctuate, which will not only introduce the problem of current signal amplitude distortion, but also may cause intermittent interruption of signal transmission, seriously affecting the continuity and accuracy of monitoring data. Summary of the Invention

[0003] The present invention is made based on the inventor's discovery and recognition of the following facts and problems:

[0004] During the measurement of the grounding current of the bushing end screen, the measuring device is tightly connected to the lead terminal of the bushing end screen through a metal clamp to obtain the current signal in the grounding loop. However, during the operation of power equipment, due to various reasons such as the operation of mechanical components, the action of wind force, and foundation settlement, the equipment itself will generate a certain degree of mechanical vibration. This vibration will be transmitted to the connection interface between the measuring device and the lead terminal of the bushing end screen, resulting in a change in the contact pressure, and further affecting the stability of the contact resistance. The fluctuation of the contact resistance will introduce the problem of current signal amplitude distortion, causing the measured current data to deviate from the actual value, thus affecting the accurate evaluation of the bushing insulation performance.

[0005] At the same time, a large amount of heat is generated during the operation of power equipment, resulting in a significant change in the temperature of the equipment itself and the surrounding environment. The change in temperature will cause the phenomenon of thermal expansion and contraction of metal materials, causing a slight deformation of the contact interface between the measuring device and the lead terminal of the bushing end screen, and further changing the size of the contact resistance. This fluctuation of the contact resistance caused by temperature change will also lead to the distortion of the current signal, affecting the accuracy of monitoring data.

[0006] What is more serious is that long-term mechanical vibration and temperature changes may also cause the connection interface to loosen or be damaged, causing intermittent interruption of signal transmission. Once the signal transmission is interrupted, the monitoring data will be missing or abnormal, seriously affecting the continuity and reliability of the monitoring data. This is undoubtedly a huge safety hazard for power systems that need to monitor the insulation status of bushings in real time and continuously. To this end, the present invention provides a high-voltage bushing end screen grounding current measurement device and a high-voltage bushing end screen grounding current measurement system, which can realize the reliable connection of the lead-out terminal and ensure the stability of the measurement.

[0007] The high-voltage bushing end screen grounding current measuring device provided by the embodiment of the present invention comprises a conductive connecting rod, a cover shell and a grounding wire, wherein the conductive connecting rod is provided with a connecting contact, wherein the connecting contact is used to connect the lead-out terminal, wherein the connecting contact comprises a plurality of elastic clamping claws, wherein the elastic clamping claws are equidistantly distributed around the circumference of the conductive connecting rod, and the elastic clamping claws have free ends, wherein the free ends of the elastic clamping claws enclose a clamping cavity that can be elastically opened and closed, and the lead-out terminal is clamped in the clamping cavity; the cover shell is sleeved on the outer side of the conductive connecting rod, wherein the cover shell is connected to the bushing end screen, wherein the cover shell is provided with a wire passing hole, wherein a wire harness tightening assembly is provided at the wire passing hole, and one end of the grounding wire passes through the wire passing hole and the wire harness tightening assembly to be connected to the conductive connecting rod.

[0008] In summary, the high-voltage bushing end screen grounding current measuring device provided in the embodiment of the present invention can realize reliable connection of the lead-out terminal through multiple elastic clamps, ensure the stability of the measurement, and facilitate quick disassembly and installation; and the wire harness tightening assembly not only prevents the safety hazards caused by loosening of the grounding wire, but also avoids damage to the line caused by excessive tension, thereby ensuring the safety and reliability of the measuring device in long-term operation.

[0009] In some embodiments, the wire harness tightening assembly includes a rubber sheath and an adhesive tape, the grounding wire is inserted into the rubber sheath, and the adhesive tape is wrapped around the outside of the rubber sheath and the grounding wire.

[0010] In some embodiments, the wire harness tightening assembly includes a screw sleeve and a plurality of elastic claws, the elastic claws are connected to the wire passing hole, and the plurality of elastic claws enclose a contraction cavity for the ground wire to pass through, the screw sleeve is threadedly sleeved on the outside of the elastic claw, and the screw sleeve is movable along the elastic claw to adjust the inner diameter of the contraction cavity.

[0011] In some embodiments, the elastic clamping claw is provided with anti-slip grooves, and the inner diameter of the clamping cavity is less than or equal to 0.8-0.9 times the outer diameter of the lead terminal.

[0012] In some embodiments, a groove is provided on the elastic clamping claw, and a strap is provided in the groove.

[0013] In some embodiments, the connecting contact further includes an elastic member disposed in the clamping cavity. One end of the elastic member is connected to the conductive connecting rod, and the other end of the elastic member abuts against the lead-out terminal.

[0014] In some embodiments, the housing includes a connected cover body and a base. An installation seat is provided on the bushing grading ring end screen, and the base is fixed to the installation seat by bolts.

[0015] In some embodiments, the conductive connecting rod is provided with a first hole and a second hole. The first hole is located at the end of the conductive connecting rod, and the second hole is located in the middle of the conductive connecting rod. Studs are provided on both the first hole and the second hole, and the studs are used to fix the grounding wire.

[0016] In addition, the high-voltage bushing grading ring end screen grounding current measurement system provided by the present invention includes the high-voltage bushing grading ring end screen grounding current measurement device and a current transformer described in any of the above embodiments. The current transformer is connected to the grounding wire, and the current transformer is used to upload current data to the background server in real time.

[0017] In some embodiments, the high-voltage bushing grading ring end screen grounding current measurement system further includes a grounding monitoring circuit. The monitoring circuit has an indicator light, and the indicator light is used to monitor the grounding status of the bushing grading ring end screen in real time. The indicator light has a constant-on state and an off state. In the constant-on state, it indicates good grounding, and in the off state, it indicates poor grounding. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of a high-voltage bushing grading ring end screen grounding current measurement device provided by an embodiment of the present invention.

[0019] Figure 2 is a three-dimensional schematic diagram of a connecting contact in a high-voltage bushing grading ring end screen grounding current measurement device provided by an embodiment of the present invention.

[0020] Figure 3 is a schematic internal structure diagram of a connecting contact in a high-voltage bushing grading ring end screen grounding current measurement device provided by an embodiment of the present invention.

[0021] Figure 4 is a schematic structural diagram of a wire harness tightening assembly in a high-voltage bushing grading ring end screen grounding current measurement device provided by an embodiment of the present invention.

[0022] Figure 5 is a schematic structural diagram of a wire harness tightening assembly in a high-voltage bushing grading ring end screen grounding current measurement device provided by another embodiment of the present invention.

[0023] Reference numerals: 100, high-voltage bushing end screen grounding current measuring device; 110, grounding wire; 200, bushing end screen; 210, lead-out terminal; 220, mounting seat;

[0024] 10. Conductive connecting rod; 11. First hole; 12. Second hole; 13. Stud;

[0025] 20. cover shell; 21. wire hole; 22. cover body; 23. base;

[0026] 30. Connecting contact; 31. Elastic clamping claw; 311. Free end; 312. Anti-slip pattern; 313. Groove; 32. Clamping cavity; 33. Elastic member;

[0027] 40. Wire harness tightening assembly; 41. Rubber sheath; 42. Adhesive tape; 43. Screw sleeve; 44. Elastic claw. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] like Figures 1 to 5 As shown, an embodiment of the present invention provides a high-voltage bushing end screen grounding current measuring device 100, which includes a conductive connecting rod 10, a cover shell 20 and a grounding wire 110. A connecting contact 30 is provided on the conductive connecting rod 10, and the connecting contact is used to connect the lead-out terminal 210. The connecting contact 30 includes a plurality of elastic clamping claws 31, and the elastic clamping claws 31 are equidistantly distributed around the circumference of the conductive connecting rod 10, and the elastic clamping claws 31 have free ends 311. The free ends 311 of the elastic clamping claws 31 enclose a clamping cavity 32 that can be elastically opened and closed, and the lead-out terminal 210 is clamped in the clamping cavity 32; the cover shell 20 is sleeved on the outer side of the conductive connecting rod 10, and the cover shell 20 is connected to the bushing end screen 200. The cover shell 20 is provided with a wire passing hole 21, and a wire harness tightening assembly 40 is provided at the wire passing hole 21. One end of the grounding wire 110 passes through the wire passing hole 21 and the wire harness tightening assembly 40 to be connected to the conductive connecting rod 10.

[0030] Specifically, the connecting contact 30 can achieve a stable connection with the lead-out terminal 210 of the high-voltage bushing end shield 200. A plurality of elastic clamping claws 31 are distributed in an equidistant manner along the circumference of the conductive connecting rod 10, ensuring a uniform distribution of the clamping force. Each elastic clamping claw 31 has a free end 311, which can naturally enclose a clamping cavity 32 that can be elastically opened and closed when not subject to external force, so that the lead-out terminal 210 can be easily clamped in the clamping cavity 32, and can maintain a good contact state even under complex working conditions such as vibration or temperature changes.

[0031] The housing 20 not only provides physical protection for the conductive connecting rod 10 and the connecting contact 30, preventing external environmental factors (such as moisture, dust, etc.) from interfering with or damaging the measurement circuit, but also realizes precise control of the tightness of the grounding wire 110 through the wire harness tightening assembly 40 at the wire passing hole 21. The wire harness tightening assembly 40 is arranged at the position of the wire passing hole 21 of the housing 20, which can adjust the tightness of the grounding wire 110 to ensure that the grounding wire 110 neither sways due to being too loose nor is damaged due to being too tight, thereby effectively improving the safety and stability of the entire measuring device.

[0032] In summary, the high-voltage bushing end screen grounding current measuring device provided by the embodiment of the present invention can achieve reliable connection of the lead-out terminal 210 through multiple elastic jaws 31, ensuring the stability of measurement, and is also convenient for quick disassembly and installation; moreover, the wire harness tightening assembly 40 not only prevents potential safety hazards caused by the loosening of the grounding wire 110, but also avoids wire damage caused by excessive tightness, thereby ensuring the safety and reliability of the measuring device during long-term operation.

[0033] As Figure 1 shown, in some embodiments, the housing 20 includes a connected cover body 22 and a base 23. An installation seat 220 is provided on the bushing end screen 200, and the base 23 is fixed to the installation seat 220 by bolts. Among them, the cover body 22 can play a role of covering and protecting, effectively preventing external sundries and dust from entering the interior, thereby providing effective protection for the conductive connecting rod 10. And the base 23 is the support structure of the housing 20, which can provide a stable installation foundation for the cover body 22, facilitating the installation of the cover body 22 onto the bushing end screen 200.

[0034] As Figure 3 shown, in this embodiment, the elastic jaw 31 is provided with anti-slip lines 312, and the inner diameter of the clamping cavity 32 is less than or equal to 0.8 - 0.9 times the outer diameter of the lead-out terminal 210. Specifically, the anti-slip lines 312 can increase the roughness of the contact surface, effectively improving the friction between the jaw and the lead-out terminal 210. Even under wet, oily or extreme temperature conditions, it can ensure a tight connection between the two, preventing poor contact or measurement errors caused by slippage. And the inner diameter of the clamping cavity 32 is set to be less than or equal to 0.8 - 0.9 times the outer diameter of the lead-out terminal 210, which not only ensures that the clamping cavity 32 can provide sufficient radial pressure when clamping, so that the lead-out terminal 210 is firmly fixed in the cavity, but also ensures that this pressure will not be too large, thus avoiding damage such as scratches or deformation on the surface of the lead-out terminal 210 due to excessive extrusion.

[0035] Further, the elastic jaw 31 is provided with a groove 313, and a strap is arranged in the groove 313. That is to say, when the lead-out terminal 210 is inserted into the clamping cavity 32, the strap can be wound into the groove 313 of the elastic jaw 31 to further fix the elastic jaw 31 and improve the connection stability of the lead-out terminal 210.

[0036] In some embodiments, the connection contact 30 further includes an elastic member 33. The elastic member 33 is arranged in the clamping cavity 32. One end of the elastic member 33 is connected to the conductive link 10, and the other end of the elastic member 33 abuts against the lead-out terminal 210. Specifically, the two ends of the elastic member 33 correspond to the conductive link 10 and the lead-out terminal 210, which can not only provide the necessary clamping force to ensure the close contact between the connection contact 30 and the lead-out terminal 210, thereby maintaining the stability and reliability of the electrical connection.

[0037] Further, the elastic member 33 can be a spring.

[0038] As Figure 4 shown, in some embodiments, the wire harness tightening assembly 40 includes a rubber sheath 41 and an adhesive tape 42. The grounding wire 110 is passed through the rubber sheath 41, and the adhesive tape 42 is wound around the outer sides of the rubber sheath 41 and the grounding wire 110. Among them, the rubber sheath 41 has excellent flexibility and wear resistance, which can provide a reliable protective layer for the grounding wire 110, thereby effectively preventing the grounding wire 110 from being eroded by the external environment, such as moisture, dust and oil stains, etc., and can also resist mechanical wear to a certain extent and extend the service life of the grounding wire 110. At the same time, the elasticity of the rubber sheath 41 can adapt to different diameters and bending degrees of the grounding wire 110 to ensure the smooth passage of the grounding wire 110 during the threading process.

[0039] The adhesive tape 42 is wound around the outer sides of the rubber sheath 41 and the grounding wire 110. The adhesive tape 42 has strong adhesion and weather resistance, which can firmly bind the rubber sheath 41 and the grounding wire 110 together to prevent them from loosening or falling off during use. In addition, the adhesive tape 42 also has a certain stretchability, which can adapt to the thermal expansion and contraction of the wire harness in different environments and keep the wire harness clean and beautiful. Optionally, the adhesive tape can be a tape.

[0040] As Figure 5 shown, in another embodiment, the wire harness tightening assembly 40 includes a screw sleeve 43 and a plurality of elastic claws 44. The elastic claws 44 are connected to the wire passing hole 21, and the plurality of elastic claws 44 enclose to form a contraction cavity for the grounding wire 110 to pass through. The screw sleeve 43 is sleeved on the outside of the elastic claws 44 through threads, and the screw sleeve 43 is movable along the elastic claws 44 to adjust the inner diameter of the contraction cavity.

[0041] Specifically, the elastic claws 44, as the key elements of the wire harness tightening assembly 40, are ingeniously connected at the wire passing hole 21. These elastic claws 44 have excellent elasticity and toughness, and can form an enclosed structure around the wire passing hole 21. Multiple elastic claws 44 are closely arranged together, and a contraction cavity is formed between them. This contraction cavity is a dedicated channel designed for the ground wire 110. Due to the elastic characteristics of the elastic claws 44, the inner diameter of the contraction cavity can be adjusted as needed to accommodate ground wires 110 of different diameters.

[0042] To achieve precise adjustment of the inner diameter of the contraction cavity, a screw sleeve 43 is sleeved outside the elastic claws 44. The screw sleeve 43 is threadedly connected to the elastic claws 44. This connection method not only ensures the firmness of the screw sleeve 43 on the elastic claws 44 but also enables the screw sleeve 43 to move along the axial direction of the elastic claws 44. When the inner diameter of the contraction cavity needs to be adjusted, simply rotate the screw sleeve 43. Rotating the screw sleeve 43 clockwise will cause the screw sleeve 43 to move towards the root of the elastic claws 44, thereby pressing the elastic claws 44 to contract inward and reducing the inner diameter of the contraction cavity; rotating the screw sleeve 43 counterclockwise will cause the screw sleeve 43 to move away from the root of the elastic claws 44, releasing the pressure on the elastic claws 44 and increasing the inner diameter of the contraction cavity.

[0043] This design with the cooperation of the screw sleeve 43 and the elastic claws 44 not only achieves flexible adaptation to the diameter of the ground wire 110 but also ensures the stability and reliability of the wire harness tightening assembly 40 during long-term use. Regardless of how the diameter of the ground wire 110 changes or how slightly the wire harness is displaced under external forces, the screw sleeve 43 and the elastic claws 44 can maintain a firm grip on the ground wire 110, preventing it from loosening or falling off.

[0044] In some embodiments, the conductive connecting rod 10 is provided with a first hole 11 and a second hole 12. The first hole 11 is located at the end of the conductive connecting rod 10, and the second hole 12 is located in the middle of the conductive connecting rod 10. Studs 13 are provided on both the first hole 11 and the second hole 12, and the studs 13 are used to fix the ground wire 110.

[0045] Specifically, both the first hole 11 and the second hole 12 can be used to fix the ground wire 110. The first hole 11 is provided at the end of the conductive connecting rod 10, which can facilitate direct and effective connection with an external grounding device or other components that need to be grounded. The second hole 12 is located in the middle area of the conductive connecting rod 10, enabling more overlap between the ground wire 110 and the conductive connecting rod 10, which helps to improve the connection stability and reduce the risk of poor contact between the ground wire and the conductive connecting rod 10.

[0046] It is worth mentioning that in practical applications, either the first hole 11 or the second hole 12 can be selected for use according to specific grounding requirements and scenarios to ensure a fixed and reliable electrical connection, increasing the flexibility and adaptability of the grounding system, making the entire grounding system more perfect, reliable and easy to maintain.

[0047] In addition, an embodiment of the present invention further provides a system for measuring the grounding current of the end screen of a high-voltage bushing, which includes the device for measuring the grounding current of the end screen of the high-voltage bushing provided in any of the above embodiments and a current transformer. The current transformer is connected to the grounding wire 110, and the current transformer is used to upload current data to the background server in real time.

[0048] Specifically, the device for measuring the grounding current of the end screen of the high-voltage bushing can be responsible for collecting the grounding current information of the end screen 200 of the high-voltage bushing, accurately capturing the changes in the grounding current, and providing a reliable basis for subsequent data analysis and processing. The current transformer is closely connected to the grounding wire 110. Through the principle of electromagnetic induction, the current signal in the grounding wire 110 is converted into an electrical signal that can be processed by the background server, ensuring the accuracy of the signal during the conversion process and providing an accurate data source for the data analysis of the background server.

[0049] More importantly, the current transformer can also upload the collected current data to the background server in real time by wired or wireless means. As the data processing and analysis center of the system, the background server can store, process and analyze the received current data, generate intuitive current change curves and reports, and provide real-time monitoring information and decision-making support for the operation and maintenance personnel.

[0050] Furthermore, the system for measuring the grounding current of the end screen of the high-voltage bushing further includes a grounding monitoring circuit. The monitoring circuit has an indicator light, and the indicator light is used to monitor the grounding status of the end screen 200 of the bushing in real time. The indicator light has a constant-on state and an off state. In the constant-on state, it indicates good grounding, and in the off state, it indicates poor grounding.

[0051] It should be noted that the implementation principle and the technical effects generated by the system for measuring the grounding current of the end screen of the high-voltage bushing provided in the embodiments of the present application are the same as those of the embodiments of the device for measuring the grounding current of the end screen of the high-voltage bushing described above. For a brief description, for the parts not mentioned in the system embodiments, reference may be made to the corresponding content in the embodiments of the device for measuring the grounding current of the end screen of the high-voltage bushing described above.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0054] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0056] In the present invention, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A measuring device for the grounding current of the grading ring of a high-voltage bushing, characterized in that, It includes a conductive connecting rod, a cover shell and a grounding wire, the conductive connecting rod is provided with a connecting contact, the connecting contact is used to connect the lead-out terminal, the connecting contact includes a plurality of elastic clamps, the elastic clamps are equidistantly distributed around the circumference of the conductive connecting rod, and the elastic clamps have free ends, the free ends of the elastic clamps enclose a clamping cavity that can be elastically opened and closed, and the lead-out terminal is clamped in the clamping cavity; the cover shell is sleeved on the outside of the conductive connecting rod, the cover shell is connected to the end screen of the bushing, the cover shell is provided with a wire passing hole, a wire harness tightening assembly is provided at the wire passing hole, one end of the grounding wire passes through the wire passing hole and the wire harness tightening assembly to be connected to the conductive connecting rod.

2. The grounding current measuring device for the grading ring of the high voltage bushing according to claim 1, wherein The wire harness tightening assembly comprises a rubber sheath and an adhesive tape, the grounding wire is inserted into the rubber sheath, and the adhesive tape is wound around the outer sides of the rubber sheath and the grounding wire.

3. The measuring device for the grounding current of the HV bushing grading capacitor according to claim 1, characterized in that The wire harness tightening assembly includes a screw sleeve and a plurality of elastic claws, wherein the elastic claws are connected to the wire passing hole, and the plurality of elastic claws enclose a contraction cavity for the ground wire to pass through, the screw sleeve is threadedly sleeved on the outer side of the elastic claw, and the screw sleeve can be moved along the elastic claw to adjust the inner diameter of the contraction cavity.

4. The measuring device for the grounding current of the HV bushing grading capacitor according to claim 1, wherein, The elastic clamping claw is provided with anti-slip patterns, and the inner diameter of the clamping cavity is less than or equal to 0.8-0.9 times the outer diameter of the lead terminal.

5. The grounding current measuring device for the grading ring of the high voltage bushing according to claim 1, characterized in that, The elastic clamping claw is provided with a groove, and a binding belt is arranged in the groove.

6. The grounding current measuring device for the grading ring of the high-voltage bushing according to claim 1, wherein The connecting contact further comprises an elastic member, which is arranged in the clamping cavity, one end of the elastic member is connected to the conductive connecting rod, and the other end of the elastic member abuts against the lead-out terminal.

7. The grounding current measuring device for the grading ring of the high-voltage bushing according to claim 1, wherein The cover shell comprises a cover body and a base connected to each other. A mounting seat is arranged on the casing end screen, and the base is fixed to the mounting seat by bolts.

8. The measuring device for the grounding current of the HV bushing grading capacitor according to claim 1, characterized in that, The conductive connecting rod is provided with a first hole and a second hole, wherein the first hole is located at the end of the conductive connecting rod, and the second hole is located in the middle of the conductive connecting rod. Both the first hole and the second hole are provided with studs, and the studs are used to fix the grounding wire.

9. A grounding current measurement system for the grading ring of a high-voltage bushing, characterized in that, It comprises the high-voltage bushing end screen grounding current measuring device and current transformer as described in any one of claims 1 to 6 above, wherein the current transformer is connected to the grounding wire, and the current transformer is used to upload the current data to the background server in real time.

10. The high-voltage bushing end screen grounding current measurement system according to claim 9, wherein It also includes a grounding monitoring circuit, which has an indicator light. The indicator light is used to monitor the grounding status of the casing end screen in real time. The indicator light has a normally on state and an off state. In the normally on state, it indicates that the grounding is good, and in the off state, it indicates that the grounding is poor.

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