Device for replacing a whole string of tension insulators at the crossarm and conductor ends of a DC transmission line

Abstract

The present invention discloses a device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line, aiming to provide a device that can improve the working efficiency. It includes a cross arm end bracket and a conductor end bracket; the cross arm end bracket includes a first bracket body, a first pulley, and two first diagonal braces; the first bracket body includes an H-shaped first body, a connecting portion connected to the upper ends of both sides of the first body, two first support plates arranged vertically and symmetrically fixed to the upper ends of the connecting portion, and a plurality of first reinforcing bolts connecting the two first support plates; first supporting portions extending to the outside of the first body are arranged on both sides of the lower end of the first body, and the first supporting portions are provided with first bolts for connecting the cross arm end clamps of the tower; the first pulley is located between the two first support plates and connected to the two first support plates through a first rotating shaft; the two first diagonal braces are respectively located on both sides of both sides of the first body, and are respectively connected to both sides of the connecting portion through first screws.

Description

Technical Field

[0001] The invention relates to the technical field of power grid maintenance tools, and in particular to a device for replacing a whole string of tension insulators at a cross arm end and a conductor end of a direct current transmission line. Background Art

[0002] With the rapid development of the power industry, long-distance, large-capacity DC transmission technology has become a cutting-edge technology for power grids. At present, many DC ultra-high voltage transmission lines have been officially put into operation. In the daily operation and maintenance process, self-explosion of glass insulators and zero value of porcelain insulators are relatively common defects. However, due to the special characteristics of zinc rings on DC line insulators, it is difficult to arrange power outages for maintenance of DC transmission lines.

[0003] Although conventional fixtures are now available for replacement tools, in actual practice there are still disadvantages such as high labor intensity for operators, many requirements for operators, and high requirements for the skill level of operators. In order to meet the needs of the development of live operations on high-voltage DC transmission lines, according to the characteristics of high-voltage DC transmission line tension insulators and the "fixture for replacing a whole string of single pieces of tension insulators for ±500kV transmission lines" disclosed in Chinese Patent Publication No. 209526429U, it is very necessary to design a set of auxiliary tools for live replacement of DC transmission line tension insulator fixtures and their supporting tools.

[0004] The main reason is that when ground potential workers and equipotential workers work at high altitudes, there are the following working conditions:

[0005] (1) When working at height, ground potential workers need to bend over to release the first piece of the old insulator string; (2) When working at height, ground potential workers need to bend over to install the first piece of the new insulator string; (3) When working at height, equipotential workers need to bend over to release the last piece of the old insulator string; (4) When working at height, equipotential workers need to bend over to install the last piece of the new insulator string.

[0006] In the above-mentioned working conditions, due to the low installation height of the original lifting pulley, the operator needs to bend over to lift and move. The weight of the entire 500kV insulator string is about 1000kg. Even with a bottle support, it is difficult for a single person to lift the first and last piece of the insulator string at high altitude, and the work intensity is high. This greatly affects the efficiency of the entire insulator replacement work and the replacement operation time is long. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a device for replacing a whole string of tension insulators at the crossarm end and the conductor end of a DC transmission line, which can improve the efficiency of the replacement operation.

[0008] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0009] A device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line, comprising a cross arm end bracket connected to a fixture of a tower cross arm end when in use, and a conductor end bracket connected to a fixture of a tower conductor end when in use; the cross arm end bracket comprises a first bracket body, a first pulley, and two first diagonal braces; the first bracket body comprises an H-shaped first body, a connecting portion connected to the upper ends of both sides of the first body, two first support plates arranged vertically and symmetrically fixed to the upper ends of the connecting portion, and a plurality of first reinforcing bolts connecting the two first support plates; first supporting portions extending outwardly from the lower end of the first body are arranged on both sides, and the first supporting portions are provided with first bolts for connecting the fixture of the tower cross arm end; the first pulley is located between the two first support plates and connected to the two first support plates through a first rotating shaft; the two first diagonal braces are respectively located on both sides of both sides of the first body, and are respectively connected to both sides of the connecting portion through a first screw; the lower end of the first diagonal brace is provided with a second bolt for connecting the fixture of the tower cross arm end;

[0010] The wire end bracket includes a second bracket body, a second pulley, and two second diagonal braces; the second bracket body includes a second body in the shape of a strip, two second support plates arranged vertically and symmetrically fixed to the upper end of the second body, and a plurality of second reinforcing bolts connecting the two second support plates; second support parts extending outwardly from the lower end of the second body are arranged on both sides, and third bolts for connecting the wire end fixture of the wire tower are arranged on the second support parts; the second pulley is located between the two second support plates and is connected to the two second support plates through a second rotating shaft; the two second diagonal braces are respectively located on both sides of the two sides of the second body, and are respectively connected to the two sides of the second connecting part through a second screw; the lower end of the second diagonal brace is provided with a fourth bolt for connecting the wire end fixture of the wire tower;

[0011] Preferably, the cross arm end bracket also includes a first rib connecting the first body and the first supporting portion.

[0012] Preferably, the wire end bracket further includes a second rib connecting the second body and the second supporting portion.

[0013] Preferably, a weight-reducing hole is provided on the second body.

[0014] Preferably, the first body, the connecting portion and the first supporting plate are an integrated piece.

[0015] Preferably, the second body and the second support plate are an integral piece.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention can greatly improve the existing efficiency of replacing a whole string of tension insulators for DC transmission lines, simplify the operation steps, reduce the operation time of replacing a whole string of tension insulators, and reduce the risk of power grid operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic structural diagram of the cross arm end bracket in the present invention.

[0020] Figure 2 for Figure 1 Left view of .

[0021] Figure 3 It is a schematic structural diagram of the wire end bracket in the present invention.

[0022] Figure 4 for Figure 1 Left view of .

[0023] Figure 5 This is a schematic diagram of the connection between the cross arm end bracket and the existing tower cross arm end fixture.

[0024] Figure 6 It is a schematic diagram of the connection between the conductor end bracket and the existing tower conductor end fixture.

[0025] Figure 7 This is a three-dimensional diagram of the crossarm end bracket.

[0026] Figure 8 A three-dimensional view of the wire end bracket. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the following description, in order to clearly show the structure and working mode of the present invention, the drawings will be used as a reference and described with the help of many directional terms, but the words "front", "back", "left", "right", "up", "down" and so on should be understood as convenient terms, and should not be understood as restrictive terms.

[0028] Figure 1-8The device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line shown in the figure comprises a cross arm end bracket connected to a cross arm end fixture 30 of a tower when in use, and a conductor end bracket connected to a conductor end fixture 40 of a tower when in use;

[0029] The cross arm end bracket includes a first bracket body 1, a first pulley 2, and two first diagonal braces 3; the first bracket body 1 includes an H-shaped first body 4, a connecting portion 5 connected to the upper ends of both sides of the first body 4, two first support plates 6 arranged vertically and symmetrically fixed to the upper ends of the connecting portion 5, and two first reinforcing bolts 7 connecting the two first support plates 6. In this embodiment, the two first reinforcing bolts 7 are located at two opposite distal ends of the first support plate 6;

[0030] The first supporting parts 8 extending outward are arranged on both sides of the lower end of the first body 4, and the first supporting parts 8 are provided with first bolts 9 for connecting the clamps 30 of the cross arm end of the line tower; the first pulley 2 is located between the two first supporting plates 6 and connected to the two first supporting plates 6 through the first rotating shaft 10; the two first diagonal braces 3 are respectively located on both sides of the two sides of the first body 4, and are respectively connected to the two sides of the connecting part 5 through the first screw rods 11, and the angle of the first diagonal brace can be adjusted by loosening the first screw rods; the lower end of the first diagonal brace 3 is provided with a second bolt 12 for connecting the clamps 30 of the cross arm end of the line tower;

[0031] The wire end bracket includes a second bracket body 13, a second pulley 14, and two second diagonal braces 15; the second bracket body 13 includes a second body 16 in a strip shape, two second support plates 17 arranged vertically and symmetrically fixed to the upper end of the second body 16, and two second reinforcing bolts 18 connecting the two second support plates 17. In this embodiment, the two second reinforcing bolts 7 are located at two opposite distal ends of the second support plate;

[0032] The second body 16 is provided with second supporting parts 19 extending outwards thereof at both sides of the lower end thereof, and the second supporting parts 19 are provided with third bolts 20 for connecting the wire tower wire end fixture 40; the second pulley 14 is located between the two second supporting plates 17 and connected to the two second supporting plates 17 through the second rotating shaft 21; the two second diagonal braces 15 are respectively located on both sides of the second body 16, and are respectively connected to the two sides of the second connecting part 5 through the second screw rod 22; the lower end of the second diagonal brace 15 is provided with a fourth bolt 24 for connecting the wire tower wire end fixture 40;

[0033] In this embodiment, the cross arm end bracket further includes a first rib plate 25 connecting the first body 4 and the first support portion 8 to strengthen the connection strength between the first body 4 and the first support portion 8. The wire end bracket further includes a second rib plate 26 connecting the second body 16 and the second support portion 19 to strengthen the connection strength between the second body 16 and the second support portion 19.

[0034] In this embodiment, a weight-reducing hole 23 is provided on the second body 16 to reduce its own weight and facilitate operation.

[0035] In this embodiment, the first body 4, the connecting portion 5 and the first support plate 6 are an integrally formed one-piece. The second body 16 and the second support plate 17 are an integrally formed one-piece.

[0036] When the present invention is used, the wire end bracket and the cross arm end bracket are installed on the existing fixture. In the process of replacing the whole string of insulators, the insulators can be hoisted by the wire end bracket and the cross arm end bracket, and the operator does not need to bend over the insulator to operate, and does not need to lift the whole string of insulators. The ground electrician can lift the insulator to the installation position, which greatly reduces the labor intensity and technical difficulty of the operator. The present invention can also reduce the tools carried by the equal potential personnel and the intermediate potential personnel before entering the potential, reducing the labor intensity.

[0037] The hanging operation process of the whole string of old insulators to be replaced is as follows: After the conductor end bracket and the cross arm end bracket are firmly installed and the insulating ropes are installed, they are tied to the second insulators on the conductor side and the cross arm side respectively. The conductor side insulator is first removed, and under the control of the insulating rope on the cross arm end bracket, the whole string of insulators is slowly changed from a horizontal state to a naturally drooping state in cooperation with the insulating bottle support. Then the R pin of the cross arm side insulator is removed, and the insulating rope of the cross arm side bracket is applied to slightly lift the whole string of insulators until the insulator and the ball head hanging ring are not stressed, and then the whole string of insulators is withdrawn. At this time, the insulating ropes of the cross arm side and the conductor side bracket are simultaneously stressed to place the whole string of insulators steadily on the ground.

[0038] The lifting process of the whole string of new insulators to be replaced is as follows: the cross arm end bracket and the insulating rope of the wire end bracket are stressed at the same time to lift the whole string of insulators smoothly to the installation position. Due to the installation of the cross arm end bracket and the wire end bracket, the cross arm side of the whole string of insulators can be lifted to a height slightly higher than the installation position by 3-5 cm. At this time, it will be greatly convenient to connect the whole string of insulators with the ball head hanging ring on the cross arm side, and install the R pin. Then restore the whole string of insulators to the natural drooping state, and use the insulating bottle support rack and the insulating rope of the wire end bracket to pull the whole string of insulators to the installation position of the wire end. At this time, the equipotential electrician connects the bowl head hanging ring with the whole string of insulators and installs the M pin.

[0039] If the cross arm end bracket and the conductor end bracket are used in combination as a transfer tool, a non-conductive insulating rope can be installed on the first pulley and the second pulley.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. For those skilled in the art, any modification, equivalent replacement and improvement of the technical solutions or partial technical features recorded in the above specific embodiments within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line, characterized in that: The present invention relates to a method of making the tower crane have a plurality of horizontal arm brackets, each of which is connected to a plurality of horizontal arm brackets, each of which is connected to a plurality of horizontal arm brackets at a time. The method comprises: firstly, wherein the first arm bracket has a plurality of horizontal arm brackets, and the second arm brackets are connected to a plurality of horizontal arm brackets at a time. The method comprises: firstly, wherein the first arm bracket has a plurality of horizontal arm brackets, each of which is connected to a plurality of horizontal arm brackets at a time. The method comprises: The wire end bracket includes a second bracket body, a second pulley, and two second diagonal braces; the second bracket body includes a second body in the shape of a strip, two second support plates arranged vertically and symmetrically fixed to the upper end of the second body, and a plurality of second reinforcing bolts connecting the two second support plates; second support parts extending outwardly from the lower end of the second body are arranged on both sides, and third bolts for connecting the wire end fixture of the wire tower are arranged on the second support parts; the second pulley is located between the two second support plates and is connected to the two second support plates through a second rotating shaft; the two second diagonal braces are respectively located on both sides of the second body, and are respectively connected to the two sides of the second connecting part through a second screw; the lower end of the second diagonal brace is provided with a fourth bolt for connecting the wire end fixture of the wire tower; When in use, the conductor end bracket and the cross arm end bracket are installed on the existing fixture. During the replacement of the entire string of insulators, the insulators are hoisted through the conductor end bracket and the cross arm end bracket, and the ground electrician can hoist the insulator to the installation position; The hanging operation process of the old insulator to be replaced is as follows: after the conductor end bracket and the cross arm end bracket are firmly installed and the insulating rope is installed, they are tied to the second insulator on the conductor side and the cross arm side respectively. The conductor side insulator is first removed, and under the control of the insulating rope on the cross arm end bracket, the whole string of insulators is slowly changed from a horizontal state to a naturally drooping state in cooperation with the insulating bottle support rack; then the cross arm side insulator R pin is taken out, and the cross arm side bracket insulating rope is applied to slightly lift the whole string of insulators until the insulator and the ball head hanging ring are not stressed, and then the whole string of insulators is withdrawn; at this time, the insulating ropes of the cross arm side and conductor side brackets are simultaneously stressed to put the whole string of insulators steadily on the ground; The lifting process of the whole string of new insulators to be replaced is as follows: the cross arm end bracket and the insulating rope of the conductor end bracket are stressed at the same time to lift the whole string of insulators smoothly to the installation position. Due to the installation of the cross arm end bracket and the conductor end bracket, the cross arm side of the whole string of insulators is lifted to a height slightly higher than the installation position by 3-5 cm. At this time, the whole string of insulators is connected to the ball head hanging ring on the cross arm side, and the R pin is installed; then the whole string of insulators is restored to the natural drooping state, and the insulating bottle support rack is used in conjunction with the insulating rope of the conductor end bracket to pull the whole string of insulators to the conductor end installation position. At this time, the equipotential electrician connects the bowl head hanging ring to the whole string of insulators and installs the M pin; If the cross arm end bracket and the conductor end bracket are used in combination as a transfer tool, a non-conductive insulating rope is installed on the first pulley and the second pulley.

2. The device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line according to claim 1, characterized in that: The cross arm end bracket also includes a first rib connecting the first body and the first supporting portion.

3. The device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line according to claim 1 or 2, characterized in that: The wire end bracket also includes a second rib plate connecting the second body and the second supporting portion.

4. The device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line according to claim 1 or 2, characterized in that: The second body is provided with a weight-reducing hole.

5. The device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line according to claim 1 or 2, characterized in that: The first body, the connecting portion and the first supporting plate are an integrated piece.

6. The device for replacing a whole string of tension insulators at the cross arm end and the conductor end of a DC transmission line according to claim 1 or 2, characterized in that: The second body and the second supporting plate are an integrated piece.

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