Auxiliary equipment for measuring resistance of conducting loop of GIS device

Abstract

The utility model discloses a kind of auxiliary equipment for GIS equipment measurement conductive loop resistance, including screw rod, hexagonal head and terminal pole connected coaxially in turn, screw rod, hexagonal head and terminal pole are integrated structure, and integrated structure inside is equipped with continuous conductive inner column, the outer peripheral wall of conductive inner column is successively coated with conductive anticorrosive layer and oxidation-proof layer;Screw rod is used to be connected with the grounding bolt connection point of GIS equipment thread cooperation, to fix auxiliary equipment and lead through loop, terminal pole is used as the holding clamping end of GIS equipment conductive loop resistance measurement. Through the multilayer material structure of conductive inner column+conductive anticorrosive layer+oxidation-proof layer, in combination with high-precision threaded connection, make auxiliary equipment itself resistance stable and no oxidation, loose hidden danger, replace original grounding bolt as measurement reference, can effectively exclude the error introduced by grounding bolt oxidation, fastening not in place, when loop resistance is overproof, can directly locate fault as GIS equipment internal contact resistance problem, improve fault judgment accuracy.

Description

Technical Field

[0001] This utility model relates to the field of high voltage testing technology, specifically to an auxiliary device for measuring the resistance of conductive circuits in GIS equipment. Background Technology

[0002] In the field of high-voltage testing technology, GIS equipment is widely used in power systems due to its excellent performance. However, GIS equipment often suffers from problems such as insufficient insertion depth of internal conductive rods, oxide film or burrs on the contact surface, and insufficient pressure between disconnecting switch contacts, resulting in excessively high resistance in the conductive circuit of conductive connectors. When the circuit resistance is too high, the contacts will overheat severely under long-term operating current, which may cause local welding and affect the opening and closing of the switch. When a short-circuit current passes through, it will also damage the switching performance and dynamic and thermal stability of the switch. Therefore, accurate measurement and reasonable evaluation of the conductive circuit resistance of GIS equipment are crucial.

[0003] Currently, the measurement of conductive loop resistance in GIS equipment requires the use of the tightening bolts at the grounding lead of the grounding switch. The measurement range covers the contact resistance of the grounding bolts at the end, the resistance of the internal connecting wires, the internal contact resistance, and the contact resistance of the grounding bolts at the tail. Since the contact resistance is much greater than the connecting wire resistance, the loop resistance is mainly determined by the contact resistance at the end, internal, and tail, inevitably introducing errors in the contact resistance at the end and tail. Existing measurements typically use the DC voltage drop method, requiring workers to remove the grounding connector and then re-tighten the bolts as the measurement clamping point. However, the contact resistance at the end and tail is significantly affected by factors such as the tightness of the bolts and surface oxidation.

[0004] Although the probability of loop resistance exceeding the standard is low after the grounding bolts of the new equipment are fully tightened, in preventive testing, if the data exceeds the requirements of "DL / T596 Preventive Test Procedure for Power Equipment" that "the loop resistance shall not exceed 110% of the acceptance test value and shall not exceed the value specified in the product technical documents, and there shall be no significant difference between phases", problems such as oxidation of the grounding bolt surface and inadequate tightening will make it impossible to eliminate measurement errors, and thus make it impossible to accurately locate the fault location and judge the fault condition. At the same time, the existing measurement clamps do not have an anti-drop design, and the test clamps are prone to slippage when high current is applied, causing arcing and resulting in equipment damage or personal injury. There is still a significant need for improvement in the existing technology. Utility Model Content

[0005] This invention provides an auxiliary device for measuring the resistance of conductive circuits in GIS equipment, in order to solve the problem of data errors caused by surface oxidation and inadequate tightening of grounding bolts at both ends in existing GIS equipment.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment includes a screw, a hexagonal head and a terminal rod connected coaxially in sequence. The screw, hexagonal head and terminal rod are an integrated structure, and the integrated structure has continuous conductive inner columns inside. The outer periphery of the conductive inner column is successively covered with a conductive anti-corrosion layer and an anti-oxidation layer; the screw is used to connect with the grounding bolt of the GIS equipment to fix the auxiliary equipment and conduct the circuit; the terminal rod is used as the clamping end for measuring the resistance of the conductive circuit of the GIS equipment.

[0007] Furthermore, the screw, hexagonal head, and terminal rod are a coaxial, fixed, and non-removable integrated structure, with their centerlines coinciding.

[0008] Furthermore, the conductive anti-corrosion layer is a silver-plated layer that completely covers the outer peripheral wall of the conductive inner column, and the outer peripheral wall of the silver-plated layer is tightly attached to the inner wall of the screw, hexagonal head, and terminal rod.

[0009] Furthermore, the thickness of the silver plating layer is 18μm-22μm.

[0010] Furthermore, the anti-oxidation layer is a zirconium salt passivation layer that completely covers the outer periphery of the conductive anti-corrosion layer, and the zirconium salt passivation layer only covers the area of ​​the conductive anti-corrosion layer exposed to the external environment.

[0011] Furthermore, the thickness of the zirconium salt passivation layer is less than 3 nm.

[0012] Furthermore, the conductive inner pillar is made of copper.

[0013] Furthermore, the outer circumferential surface of the terminal rod is provided with a diamond-shaped knurled pattern extending along its axial direction. The diamond-shaped knurled pattern is a raised pattern structure integrally formed on the outer circumferential surface of the terminal rod.

[0014] Furthermore, it also includes a matching storage box, which has fixed slots corresponding to the auxiliary equipment itself.

[0015] Furthermore, the fixing position is a groove structure adapted to the shape of the auxiliary equipment body, and the inner wall of the groove is in clearance fit with the outer peripheral wall of the auxiliary equipment body.

[0016] This utility model has the following beneficial effects: The auxiliary equipment provided by this utility model for measuring the resistance of conductive circuits in GIS equipment, through a multi-layer material structure of conductive inner column + conductive anti-corrosion layer + anti-oxidation layer, combined with high-precision threaded connection, makes the resistance of the auxiliary equipment itself stable and free from oxidation and loosening risks. It replaces the original grounding bolt as the measurement reference, which can effectively eliminate the errors introduced by oxidation and improper tightening of the grounding bolt. When the circuit resistance exceeds the standard, it can directly locate the fault as an internal contact resistance problem of the GIS equipment, improving the accuracy of fault diagnosis. In addition, the diamond-shaped grid knurled texture of the terminal rod significantly increases the surface friction, completely solving the arcing problem caused by the test clip slipping during high current testing, avoiding equipment damage and personal injury. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial cross-sectional view of the conductive inner column in this utility model; Figure 3 This is a schematic diagram showing the connection between the grounding switch and auxiliary equipment in this utility model; Figures 1 to 3 The reference numerals in the attached figures are respectively: 1-screw, 2-hexagonal head, 3-terminal rod, 4-conductive inner post, 5-conductive anti-corrosion layer, 6-anti-oxidation layer. Detailed Implementation

[0018] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0019] like Figures 1 to 3 As shown, an auxiliary device for measuring the resistance of conductive circuits in GIS equipment includes a screw 1, a hexagonal head 2, and a terminal rod 3 connected coaxially in sequence. The screw 1, hexagonal head 2, and terminal rod 3 are an integrated structure, and the integrated structure has a continuous conductive inner column 4 inside. Specifically, the screw 1, hexagonal head 2, and terminal rod 3 are an integrated structure that is coaxially fixed and non-removable, and the centerlines of the three coincide.

[0020] The outer circumference of screw 1 is machined with high-precision threads conforming to the GB / T5782-2016 standard for hexagonal head bolts. This allows for precise thread engagement with the grounding bolt connection point of the GIS equipment. Tightening with a torque wrench ensures stable fixation between the auxiliary equipment and the GIS equipment, preventing poor contact due to loose connections. Furthermore, screw 1 serves as the connecting component between the auxiliary equipment and the GIS equipment's grounding circuit. Tightening it ensures continuity of the GIS equipment's grounding circuit and provides a path for subsequent current transmission, guaranteeing that current can be conducted from the GIS equipment's internal circuit to the auxiliary equipment during measurement.

[0021] The hexagonal head 2 adopts a polygonal (hexagonal) structure, providing a stable clamping point for the torque wrench. This facilitates the application of precise torque by workers when installing or disassembling auxiliary equipment, ensuring consistent tightness between the screw 1 and the connection point of the GIS equipment, and avoiding uneven tightening caused by manual operation.

[0022] Terminal rod 3 serves as a dedicated clamping end for measuring the resistance of conductive circuits in GIS equipment. It allows for direct clamping of the test clip, replacing the traditional temporary clamping method using grounding bolts, thus structurally defining the measurement reference point. The outer circumference of terminal rod 3 features a diamond-shaped knurled pattern extending along its axial direction. This diamond-shaped knurled pattern is an integrally formed raised texture structure on the outer circumference of terminal rod 3. By increasing surface friction, it prevents the test clip from slipping when a large current is applied, avoiding arcing caused by slippage, thereby protecting the equipment from damage and ensuring the personal safety of personnel.

[0023] The outer peripheral wall of the conductive inner column 4 is successively covered with a conductive anti-corrosion layer 5 and an anti-oxidation layer 6; the screw 1 is used to connect with the grounding bolt of the GIS equipment to fix the auxiliary equipment and conduct the circuit; the terminal rod 3 is used as the clamping end for measuring the resistance of the conductive circuit of the GIS equipment.

[0024] Among them, the conductive inner column 4 is made of copper. Copper is used as the base material and its excellent conductivity is utilized to serve as the core conductive path inside the auxiliary equipment. This ensures that the current can be transmitted unimpeded between the terminal rod 3, the hexagonal head 2, and the screw 1 during measurement, providing a basic guarantee for low-resistance transmission.

[0025] The conductive and anti-corrosion layer 5 is a silver-plated layer that completely covers the outer peripheral wall of the conductive inner column 4. The thickness of the silver-plated layer is 18μm-22μm, and the outer peripheral wall of the silver-plated layer is in close contact with the inner walls of the screw 1, hexagonal head 2, and terminal rod 3. Silver has better conductivity than copper, which can further reduce the resistance of the auxiliary equipment itself and improve the current transmission efficiency. The silver-plated layer has good corrosion resistance and can resist moisture, dust, and other impurities in the field measurement environment of GIS equipment, preventing the conductive inner column 4 from being corroded and causing a decrease in conductivity, thus extending the service life of the equipment.

[0026] The anti-oxidation layer 6 is a zirconium salt passivation layer that completely covers the outer periphery of the conductive anti-corrosion layer 5. The thickness of the zirconium salt passivation layer is less than 3 nm, and it only covers the area of ​​the conductive anti-corrosion layer 5 exposed to the external environment. The anti-oxidation layer 6 can effectively prevent the silver layer from oxidizing upon contact with air, avoiding increased contact resistance due to oxide film formation, and ensuring that the auxiliary equipment maintains low resistance characteristics even after long-term use. Due to its extremely thin thickness (less than 3 nm), it hardly affects the original conductivity of the silver plating layer and does not additionally increase contact resistance, thus meeting the requirements for high-precision measurement.

[0027] In addition, this application also includes a matching storage box, which has fixed slots corresponding to the auxiliary equipment body. Specifically, the complete set of auxiliary equipment includes five basic bolt sizes: M8, M10, M12, M14, and M16, with at least one pair of each size. This confines each specification of auxiliary equipment within its corresponding slot, preventing friction between the equipment due to shaking or collision during storage and handling, or direct friction with the inner wall of the storage box, thus preventing increased contact resistance caused by damage to the outer layer. Furthermore, the fixed slots are groove structures adapted to the shape of the auxiliary equipment body, with a clearance fit between the inner wall of the groove and the outer peripheral wall of the auxiliary equipment body. The clearance fit design of the groove-type fixed slots prevents the equipment from being too tight to be easily removed, and also prevents it from being too loose to cause shaking. When storing or retrieving the equipment, staff do not need to use additional tools; they can complete the operation manually, simplifying the storage management process. At the same time, because the equipment is always in an orderly and fixed state, it can reduce equipment damage caused by disordered storage (such as thread deformation and hexagonal head wear), reduce the cost of equipment maintenance or replacement, and extend the service life of the entire set of auxiliary equipment.

[0028] When using this assembly, after removing the grounding connector from the grounding switch of the GIS equipment, the operator uses a torque wrench to clamp the hexagonal head 2 of the auxiliary equipment, screws the screw 1 into the grounding bolt connection point of the GIS equipment, and tightens it. Simultaneously, the grounding connector is connected to the end of the screw 1, forming a closed circuit between the auxiliary equipment and the GIS equipment grounding loop (one auxiliary equipment of the same specification needs to be installed at each end of the same grounding loop of the GIS equipment to form two measurement points). When using the DC voltage drop method for measurement, the two test clamps of the test equipment clamp the terminal rods 3 of the auxiliary equipment at both ends, applying a 100A DC test current to the loop. The current path is: test clamp → terminal rod 3 → anti-oxidation layer 6 → conductive anti-corrosion layer 5 (silver plating) → conductive inner post 4 → screw 1 → GIS equipment grounding loop → other end screw 1 → other end conductive inner post 4 → other end conductive anti-corrosion layer 5 → other end anti-oxidation layer 6 → other end terminal rod 3 → other end test clamp, forming a complete closed circuit.

[0029] Because the auxiliary equipment adopts a high-precision thread + multi-layer low-resistance material design, its own resistance is <2μΩ, and there is no risk of oxidation or loosening. It can eliminate the contact resistance error caused by surface oxidation and inadequate tightening of traditional grounding bolts. The measurement data only reflects the resistance of the internal conductive loops of the GIS equipment (including the resistance of internal connecting wires and internal contact resistance). Staff can directly determine whether there is a problem of excessive loop resistance inside the GIS equipment based on the data, thus achieving accurate fault location.

[0030] Additionally, it should be noted that components not described in detail in this article are existing technologies.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An auxiliary device for measuring the resistance of conductive circuits in GIS equipment, characterized in that, It includes a screw (1), a hexagonal head (2) and a terminal rod (3) connected coaxially in sequence. The screw (1), hexagonal head (2) and terminal rod (3) are an integrated structure, and the integrated structure has a continuous conductive inner column (4) inside. The outer peripheral wall of the conductive inner column (4) is sequentially covered with a conductive anti-corrosion layer (5) and an anti-oxidation layer (6); the screw (1) is used to connect with the grounding bolt of the GIS equipment to fix the auxiliary equipment and conduct the circuit; the terminal rod (3) is used as the clamping end for measuring the resistance of the conductive circuit of the GIS equipment.

2. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 1, characterized in that, The screw (1), hexagonal head (2) and terminal rod (3) are an integrated structure that is coaxially fixed and non-removable, and their centerlines coincide.

3. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 1, characterized in that, The conductive anti-corrosion layer (5) is a silver-plated layer covering the outer peripheral wall of the conductive inner column (4), and the outer peripheral wall of the silver-plated layer is closely attached to the inner wall of the screw (1), hexagonal head (2), and terminal rod (3).

4. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 3, characterized in that, The thickness of the silver plating layer is 18μm-22μm.

5. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 1, characterized in that, The anti-oxidation layer (6) is a zirconium salt passivation layer that covers the outer periphery of the conductive anti-corrosion layer (5), and the zirconium salt passivation layer only covers the area of ​​the conductive anti-corrosion layer (5) exposed to the external environment.

6. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 5, characterized in that, The thickness of the zirconium salt passivation layer is less than 3 nm.

7. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 1, characterized in that, The conductive inner column (4) is made of copper.

8. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 1, characterized in that, The outer peripheral surface of the terminal rod (3) is provided with a diamond-shaped knurled pattern extending along its axial direction. The diamond-shaped knurled pattern is a raised pattern structure integrally formed on the outer peripheral surface of the terminal rod (3).

9. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 1, characterized in that, It also includes a matching storage box, which has a fixed slot corresponding to the auxiliary equipment body.

10. The auxiliary equipment for measuring the resistance of conductive circuits in GIS equipment according to claim 9, characterized in that, The fixed locking position is a groove structure adapted to the shape of the auxiliary equipment body, and the inner wall of the groove is in clearance fit with the outer peripheral wall of the auxiliary equipment body.

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