Grounding method for high-voltage overhead transmission line ground wire

Abstract

The application discloses a high-voltage overhead transmission line ground wire grounding method, which is used for realizing safe, rapid and simple equipment reliable grounding of a work area in contact ground wire work in transmission line maintenance work. The grounding end of a grounding rod is fixed on a tower to ensure good grounding, then an active clamp block is slid to open a wire clamp jaw, the wire clamp is rotated to make the wire clamp jaw face an easy-to-install direction, a locking nut is rotated to make a positioning pin out of a positioning groove, a fixing sleeve is rotated to make the wire clamp rotate in the direction of the locking bolt as an axis to reach an easy-to-install direction, the locking nut is rotated to make the positioning pin be clamped into the positioning groove of the locking sleeve, the wire clamp is placed on the overhead ground wire, the opening direction is adjusted to make the jaw be clamped on the overhead ground wire, after the wire clamp is clamped on the ground wire, the insulating tube is rotated, the universal nut drives the active wire clamp to move under the driving of the chain, and the wire clamp is clamped on the overhead ground wire.

Description

[0001] This application is a divisional application based on Chinese Patent No. 2018113431263, entitled "A Universal Grounding Rod for Overhead Transmission Lines", filed by the applicant on November 13, 2018. At least part of the original specification is incorporated herein by reference. Technical Field

[0002] This invention belongs to the field of power engineering technology, specifically relating to the grounding rod for overhead transmission lines and its usage method, and is mainly applicable to the use of grounding rods for high-voltage overhead transmission lines. Background Technology

[0003] The power industry is a fundamental industry and public utility supporting national economic and social development. With the rapid development of my country's national economy and the continuous improvement of people's living standards, the dependence on electricity is increasing. Therefore, power grid safety is crucial to the national economy and people's livelihood, and the safety of transmission lines is a vital guarantee for power grid safety. To ensure the safe and stable operation of transmission equipment, it is essential to strictly follow regulations to inspect and eliminate defects and potential hazards. For work involving the contact grounding of 500kV and above overhead transmission lines, effective grounding of the overhead grounding wire is a reliable technical means to ensure personal safety and prevent induced current accidents.

[0004] Currently, the widely used grounding short-circuit method in operations involves using a 10kV grounding rod instead of a traditional grounding rod. During use, the operator rotates the insulating tube to fix the grounding clamp to the insulated grounding wire. However, because this type of grounding rod clamp cannot rotate, it cannot guarantee that the insulating tube is perpendicular to the grounding wire. Furthermore, due to the presence of the grounding wire insulator, the insulating tube is at an angle to the grounding wire when the operator is working on the high-altitude crossarm, preventing the clamp from firmly gripping the grounding wire. This frequently results in poor contact between the clamp and the conductor, causing the clamp to slip off, or induced discharge between the conductor and the clamp, burning out the clamp and the grounding wire. Over prolonged operation, induced current can damage the clamp and even cause electric shock accidents. Therefore, it fails to ensure operational safety. In situations involving significant distances, operators need to extend beyond the crossarm, making the operation difficult and dangerous.

[0005] The above grounding methods are technically difficult, time-consuming, labor-intensive, and involve complex procedures, which seriously affect the work plan, reduce work efficiency, and cannot guarantee work safety. Summary of the Invention

[0006] The technical problem to be solved by this invention is to provide a grounding method for high-voltage overhead transmission lines, which enables the clamp to be firmly clamped to the ground wire, reduces the technical difficulty of grounding, improves work efficiency, and ensures operational safety.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A grounding method for a high-voltage overhead transmission line uses a grounding rod. The grounding rod includes an insulating tube, a connector fixed to the end of the insulating tube, a locking sleeve fixed to the connector, a fixed sleeve rotatably connected to the locking sleeve, a fixed clamp with a clamping jaw, a movable clamping block disposed within the clamping jaw, and a universal nut connected to the movable clamping block. The universal nut is rotatably connected to the fixed sleeve. The universal nut is driven to rotate by the insulating tube and drives the movable clamping block to move during rotation. The fixed sleeve has a horizontal part and a shaft connected to the horizontal part and extending axially towards the insulating tube. The universal nut moves through the horizontal part of the extension. The axial extension is connected to the locking sleeve by a locking bolt and a locking nut. When the locking nut is loosened, the fixing sleeve can rotate around the locking bolt. When the locking nut is tightened, the fixing sleeve and the locking sleeve are fixed. The connection between the axial extension and the locking sleeve is connected by a positioning pin. The locking sleeve has positioning grooves evenly distributed along the axial direction. By the engagement of the positioning pin with different positioning grooves on the locking sleeve, the fixing sleeve and the locking sleeve are fixed in different relative positions. The grounding rod also includes a chain connecting the insulating tube and the universal nut.

[0009] When using it, first fix the grounding end of the grounding rod to the iron tower to ensure good grounding, and then slide the movable clamp to open the clamp mouth;

[0010] Rotate the wire clamp so that the clamp jaws face the direction that is easy to install, and rotate the locking nut to disengage the locating pin from the locating groove;

[0011] Rotate the fixing sleeve to make the wire clamp rotate in the direction of the locking bolt as the axis, so as to achieve a position that is easy to install on site. Rotate the locking nut to make the positioning pin engage in the positioning groove on the locking sleeve.

[0012] Place the clamp on the overhead ground wire, adjust the opening direction so that the clamp is locked on the overhead ground wire. After the clamp is locked on the ground wire, rotate the insulating tube. Driven by the chain, the universal nut pushes the movable clamp to move until the clamp is locked on the overhead ground wire.

[0013] After the work is completed, rotate the insulating tube. Under the transmission action of the chain, the universal nut drives the movable clamp to move, so that the clamp clamped on the ground wire can be loosened until the clamp body can be removed from the overhead ground wire. Then remove the grounding terminal, and the whole work is completed.

[0014] The present invention adopts the above-mentioned technical solution. The wire clamp can rotate around the universal nut, and the fixed sleeve and the locking sleeve can also rotate relative to each other. When in use, the relative angle between the wire clamp and the insulating tube can be selected according to the distance and angle between the overhead ground wire and the crossarm at the work site. The wire clamp opening can be oriented in any direction, which meets the usage requirements of various work sites.

[0015] Therefore, a fast, effective, safe and reliable method for grounding the ground wire of high-voltage overhead transmission lines is provided to ensure the safe, rapid and convenient reliable grounding of equipment in the work area during transmission line maintenance operations, thus providing a reliable safety guarantee for maintenance operations.

[0016] Preferably, the two ends of the connector seat have a small-diameter cylindrical part and a large-diameter cylindrical part that are connected to each other, the locking sleeve is rotatably connected to the outside of the small-diameter cylindrical part, and the large-diameter cylindrical part is rotatably connected to the end of the insulating tube.

[0017] Preferably, the locking sleeve is fixed to the connector seat by a set screw.

[0018] Preferably, the large-diameter cylindrical portion is fixed to the insulating tube by an elastic cylindrical pin.

[0019] Preferably, the universal nut has a U-shaped clamp extending toward the head of the insulating tube, and a fixing bolt is connected between the two side walls of the U-shaped clamp. One end of the chain is connected to an elastic cylindrical pin, and the other end is connected to the fixing bolt.

[0020] Preferably, the insulating tube is connected to a rubber hand guard.

[0021] The specific technical solution of the present invention and its beneficial effects will be described in detail in the following specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

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

[0024] Figure 2 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0025] refer to Figure 1 and Figure 2 As shown, a universal grounding rod for an overhead transmission line includes an insulating tube 15, a connector seat 16 fixed to the end of the insulating tube, a locking sleeve 12 fixed to the connector seat 16, a fixed sleeve 4 rotatably connected to the locking sleeve 12, a fixed clamp 1 with a clamping opening, a movable clamping block 8 disposed in the clamping opening, and a universal nut 2 connected to the movable clamping block 8. The universal nut 2 is rotatably connected to the fixed sleeve 4. The universal nut 2 is driven to rotate by the insulating tube 15, and during rotation, the rotation is converted into linear movement through a threaded engagement structure, thereby driving the movable clamping block 8 to move, or to engage with the fixed clamp to lock the ground wire, or to loosen the ground wire. A circumferential positioning structure is provided between the locking sleeve 12 and the fixed sleeve 4 to fix the position after the locking sleeve 12 and the fixed sleeve 4 rotate relative to each other.

[0026] Under external force, the clamp can rotate around the universal nut 2, while the locking sleeve 12 and the fixing sleeve 4 can rotate relative to each other. Thus, through free rotation in two axes, the clamp opening can face any direction. During use, the relative angle between the fixing clamp 1 and the insulating tube 15 is selected according to the distance and angle between the overhead ground wire and the crossarm at the work site to meet the needs of all operating conditions. This invention features light weight, flexible operation, high work efficiency, wide applicability, easy portability, and high safety. It effectively reduces the labor intensity of operators, ensures personal and equipment safety, saves manpower and resources, and meets the usage requirements of various work sites. When the operator rotates the insulating tube 15, it drives the universal nut 2 to rotate, causing the movable clamp block 8 to move forward or backward, achieving the purpose of clamping or loosening the ground wire.

[0027] The fixing sleeve 4 has a horizontal portion and an axially extending portion connected to the horizontal portion and extending axially towards the insulating tube. The universal nut 2 movably passes through the horizontal portion. The circumferential positioning structure includes a locking bolt 6 and a locking nut 7. The axially extending portion is connected to the locking sleeve 12 via the locking bolt 6 and the locking nut 7. The tightness of the fixing sleeve 4 and the locking sleeve 12 can be adjusted by rotating the locking nut 7. Loosening the locking nut allows the fixing sleeve 4 to rotate around the locking bolt 6. Tightening the locking nut 7 fixes the fixing sleeve 4 and the locking sleeve 12, allowing them to achieve different relative positions. The locking nut 7 can be a wing nut for easy manual tightening or loosening.

[0028] The circumferential positioning structure also includes a positioning pin 5. The positioning pin 5 is connected to the connection between the axial extension and the locking sleeve 12. The locking sleeve 12 has positioning grooves evenly distributed along the axial direction. By the engagement of the positioning pin with different positioning grooves on the locking sleeve, the fixing sleeve 4 and the locking sleeve 12 are fixed at different relative positions.

[0029] The connector 16 has a small-diameter cylindrical portion and a large-diameter cylindrical portion connected at its two ends, respectively. The locking sleeve 12 is rotatably connected to the outside of the small-diameter cylindrical portion, and the large-diameter cylindrical portion is rotatably connected to the end of the insulating tube. The locking sleeve 12 and the connector 16 are fixed by a set screw 14. The position between the connector 16 and the locking sleeve 12 is adjusted by the set screw 14 on the locking sleeve 12 to ensure that the center of the connector 16 coincides with the center of the locking sleeve 12. The large-diameter cylindrical portion is fixed to the insulating tube 15 by a flexible cylindrical pin 10.

[0030] The universal grounding rod also includes a chain 13 connecting the insulating tube 15 and the universal nut 2. One end of the universal nut 2 has a U-shaped clamp extending towards the head of the insulating tube. A fixing bolt 11 is connected between the two side walls of the U-shaped clamp. One end of the chain is connected to the elastic cylindrical pin 10, and the other end is connected to the fixing bolt 11. The connection method of the chain 13 and the fixing bolt 11 ensures that the rotation of the insulating tube drives the universal nut to rotate, and also allows the fixing sleeve 4 to rotate around the locking bolt 6. In addition, the insulating tube 15 is connected to a rubber handguard 17 for the operator to grip.

[0031] In use, first fix the grounding end of the grounding rod to the tower to ensure good grounding. During use, the operator rotates the rubber handguard 17 to slide the movable clamp 8, opening the clamp jaws. Rotate the clamp so that the jaws face an easy-to-install direction. Rotate the locking nut 7 to disengage the positioning pin 5 from the positioning groove. Rotate the fixing sleeve 4 to rotate the clamp around the locking bolt 6 as an axis, achieving an easy-to-install position on site. Rotate the locking nut 7 to engage the positioning pin 5 in the positioning groove on the locking sleeve 12. The operator holds the rubber handguard 17 and places the clamp on the overhead ground wire, adjusting the opening direction so that the jaws are engaged on the overhead ground wire. After the clamp is engaged, rotate the insulating tube 15 through the rubber handguard 17. Driven by the chain 13, the universal nut 2 pushes the movable clamp 8 to move until the clamp is securely fastened to the overhead ground wire. After the work is completed, rotate the insulating tube 15 using the rubber handguard 17. Under the transmission action of the chain 13, the universal nut 2 drives the movable clamp 8 to move, loosening the clamp on the ground wire until the clamp body can be removed from the overhead ground wire. Then remove the grounding terminal, and the entire work is completed.

[0032] By adopting the above technical solution, the beneficial effects of the present invention are:

[0033] 1. This invention is easy to carry, lightweight, simple to operate, and has a wide range of applications;

[0034] 2. This invention designs a clamp rotation installation method to meet all overhead ground wire grounding situations involved in current production;

[0035] 3. This invention shortens operation time and reduces labor intensity;

[0036] 4. In terms of design and manufacturing, potential adverse situations during operation are avoided, enabling quick operation.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A method for grounding the ground wire of a high-voltage overhead transmission line, characterized in that, grounding is performed using a grounding rod, The grounding rod includes an insulating tube, a connector fixed to the end of the insulating tube, a locking sleeve fixed to the connector, a fixed sleeve rotatably connected to the locking sleeve, a fixed clamp with a clamping jaw, a movable clamping block disposed in the clamping jaw, and a universal nut connected to the movable clamping block. The universal nut is rotatably connected to the fixed sleeve. The universal nut is driven to rotate by the insulating tube and drives the movable clamping block to move when rotating. The fixed sleeve has a horizontal part and an axial extension part connected to the horizontal part and extending axially towards the insulating tube. The universal nut moves through the horizontal part. The axial extension part is connected to the locking sleeve by a locking bolt and a locking nut. After the locking nut is loosened, the fixed sleeve can rotate around the locking bolt. After the locking nut is tightened, the fixed sleeve and the locking sleeve are fixed. A positioning pin is connected at the connection between the axial extension part and the locking sleeve. The locking sleeve has positioning grooves evenly distributed along the axial direction. By the engagement of the positioning pin with different positioning grooves on the locking sleeve, the fixed sleeve and the locking sleeve are fixed in different relative positions. The grounding rod also includes a chain connecting the insulating tube and the universal nut. When using it, first fix the grounding end of the grounding rod to the iron tower to ensure good grounding, and then slide the movable clamp to open the clamp mouth; Rotate the wire clamp so that the clamp jaws face the direction that is easy to install, and rotate the locking nut to disengage the locating pin from the locating groove; Rotate the fixing sleeve to make the wire clamp rotate in the direction of the locking bolt as the axis, so as to achieve a position that is easy to install on site. Rotate the locking nut to make the positioning pin engage in the positioning groove on the locking sleeve. Place the clamp on the overhead ground wire, adjust the opening direction so that the clamp is locked on the overhead ground wire. After the clamp is locked on the ground wire, rotate the insulating tube. Driven by the chain, the universal nut pushes the movable clamp to move until the clamp is locked on the overhead ground wire. After the work is completed, rotate the insulating tube. Under the transmission action of the chain, the universal nut drives the movable clamp to move, so that the clamp clamped on the ground wire can be loosened until the clamp body can be removed from the overhead ground wire. Then remove the grounding terminal, and the whole work is completed.

2. The grounding method for a high-voltage overhead transmission line according to claim 1, characterized in that: The connector has a small-diameter cylindrical part and a large-diameter cylindrical part connected at both ends. The locking sleeve is rotatably connected to the outside of the small-diameter cylindrical part, and the large-diameter cylindrical part is rotatably connected to the end of the insulating tube.

3. The grounding method for a high-voltage overhead transmission line according to claim 2, characterized in that: The locking sleeve and the connector seat are fixed together by set screws.

4. The grounding method for a high-voltage overhead transmission line according to claim 2, characterized in that: The large-diameter cylindrical section is fixed to the insulating tube by a flexible cylindrical pin.

5. The grounding method for a high-voltage overhead transmission line according to claim 4, characterized in that: The universal nut is provided with a U-shaped clamp extending towards the head of the insulating tube. A fixing bolt is connected between the two side walls of the U-shaped clamp. One end of the chain is connected to an elastic cylindrical pin, and the other end is connected to the fixing bolt.

6. The grounding method for a high-voltage overhead transmission line according to claim 1, characterized in that: The insulating tube is connected to a rubber hand guard.

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