CA2823132C - Maintenance tool used for direct current transmission line - Google Patents

Maintenance tool used for direct current transmission line Download PDF

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Publication number
CA2823132C
CA2823132C CA 2823132 CA2823132A CA2823132C CA 2823132 C CA2823132 C CA 2823132C CA 2823132 CA2823132 CA 2823132 CA 2823132 A CA2823132 A CA 2823132A CA 2823132 C CA2823132 C CA 2823132C
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CA
Canada
Prior art keywords
clamp
string
plate
wire
insulator
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA 2823132
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French (fr)
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CA2823132A1 (en
Inventor
Shufeng Kang
Mingxu ZHANG
Fengxiang SHI
Xuebin Wang
Juxuan JIAO
Zhi Gao
Zhongsheng LI
Sanping GENG
Yongjie SU
Jian Li
Jun Wang
Boyan YAO
Ming Chen
Qifeng SONG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Maintenance Branch of State Grid Hebei Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Maintenance Branch of State Grid Hebei Electric Power Co Ltd
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Publication date
Priority to CN2010106100039A priority Critical patent/CN102136695B/en
Priority to CN201010610003.9 priority
Application filed by State Grid Corp of China SGCC, Maintenance Branch of State Grid Hebei Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to PCT/CN2011/083172 priority patent/WO2012088986A1/en
Publication of CA2823132A1 publication Critical patent/CA2823132A1/en
Application granted granted Critical
Publication of CA2823132C publication Critical patent/CA2823132C/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/02Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
    • H02G1/04Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching

Abstract

A maintenance tool used for a direct current transmission line comprises fixtures and a tensioning device, wherein the fixtures are installed at the two sides of insulators, and the tensioning device is connected between the fixtures. The fixture comprises a clamp (1) on a V type string , a clamp (2) on a cross arm, a single string clamp (3), a knife-like clamp, a closed clamp and a wire terminal fixture, and the fixture is made of TC4 titanium alloy. The maintenance tool has the advantages of sensible structure, high integral strength and load-carrying capacity, small volume, low weight and reliable operation.

Description

MAINTENANCE TOOL USED FOR
DIRECT CURRENT TRANSMISSION LINE
FIELD OF THE INVENTION
[00011 The present application relates to the field of electric power, and particularly to a maintenance tool for the direct current transmission line.
BACKGROUND OF THE INVENTION
[00021 As the power grid construction of China is improved increasingly, the extra high voltage transmission line becomes the backbone of the power grid frame of China, which also has a higher requirement on the maintenance work. Especially, as the 660kV grade of direct current transmission line is firstly applied in China, in order to ensure the normal operation of the transmission line and that troubles found during the operation of the transmission line can be solved timely, to thereby ensure the safe operation of the direct current transmission line, it is necessary to develop a set of tools for the maintenance of the transmission line in operation.
[00031 One of the primary contents of the maintenance work of the transmission line is to repair and replace an insulator. Most high voltage transmission lines are supported on the crossarm via an insulator which plays a fundamental role of supporting the wire and preventing the current from returning to the ground in the aerial transmission lines. The 660kV
ultrahigh voltage direct current transmission line, compared with the extra high voltage and ultrahigh voltage transmission lines in operation currently, employs a different material, for example, the wire is the aluminum conductor steel reinforced of 4xJ11G3A-1000145mm2, and the distance between the electrodes of the wire is 18m. The linear insulator is a V-type composite insulator which has a length of 8.5m in the light polluted area and 9.2m in the heavy polluted area. And the tension insulator string is a 5501(14 double porcelain insulators in parallel.
Influenced by the length of the string of the insulators and the electric clearance, the tower head for carrying the insulators and the transmission lines has a large size, and affected by the project, the vertical load of the lines increases accordingly, which causes the change of the tension, the length and the like, thereby has a higher requirement on the replacement of the insulator in aspects such as the tension and the length. At present, maintenance tools for the transmission line at a voltage grade below 500kV have been more perfect, however, due to the increase of the voltage grade, the diameter of the transmission line and the length of the insulator string are increased. Thus the maintenance tools have been far from the requirements for the replacement.
SUMMARY OF THE INVENTION
[0004] The technical problem to be solved by the present application is to provide a maintenance tool for a direct current transmission line.
[0005] In view of this, it is provided according to the present application the following technical solutions.
[0006] A maintenance tool for a direct current transmission line including a clamping device configured to be clamped at two sides of an insulator string and a tension device connected between the clamping device. The clamping device mainly includes a V-string upper clamp, a crossarm upper clamp, a single string clamp, a knife-like clamp, a closed clamp and a wire end clamp. The single string clamp, the wire end clamp, and the closed clamp are made of a TC4 titanium alloy material, and the tension device is a mechanical transmission screw rod.
[0007] When replacing a V type single insulator string, the V type single insulator string is replaced by a combination of the V-string upper clamp, the crossarm upper clamp, the single string clamp and two tension devices. The V-string upper clamp is fixedly connected to a fitting-hanging point angle steel at a side of a tower body; the crossarm upper clamp is fixedly connected to a crossarm wrapper plate; the single string clamp is fixedly connected to a V-string yoke plate; and the tension devices are connected between the V-string upper clamp and the single string clamp and between the crossarm upper clamp and the single string clamp, respectively.
[0008] When replacing double insulator strings, the double insulator strings are replaced by a combination of the V-string upper clamp, the crossarm upper clamp, the knife-like clamp and two tension devices. The V-string upper clamp is fixedly connected to the fitting-hanging point angle steel at a side of the tower body; the crossarm upper clamp is fixedly connected to the crossarm wrapper plate; the knife-like clamp is mounted on the V-string yoke plate; and the tension devices are connected between the V-string upper clamp and the knife-like clamp and between the crossarm upper clamp and the knife-like clamp, respectively.
[0009] When replacing a single insulator or multiple insulators in the middle portion, or a long rod insulator, two closed clamps and two tension devices are used. The closed clamps are mounted on steel covers of an insulator, and the tension devices are connected between the two closed clamps.
. =

[00101 When replacing a first insulator at a crossarm end, the first insulator is replaced by a cooperation of a crossarm end clamp, the closed clamp and two tension devices.
The single string clamp is fixedly connected to a towing plate, the closed clainp is sleeved on a steel cover of the insulator, and the tension devices are connected between the single string clamp and the closed clamp.
[0011] When replacing a first insulator at a wire end, the first insulator is replaced by a cooperation of the wire end clamp, the closed clamp and two tension devices.
The wire end clamp is fixedly connected to a wire end yoke plate, the closed clamp is sleeved on a steel cover of the insulator, and the tension devices are connected between the wire end clamp and the closed clamp.
[0012] The structure of the V-string upper clamp is that, the V-string upper clamp includes a V-string upper plate and a V-string lower plate located at two sides of the fitting-hanging point angle steel at the side of the tower body. An inner end face of the V-string upper plate is provided with a clamping groove I corresponded to the fitting-hanging point angle steel at the side of the tower body, and an outer end face of the V-string lower plate is articulated with a steel connector I, while the other end of the steel connector I is provided with a pin hole for connecting the tension device. Two ends of the V-string upper plate are connected with two ends of the V-string lower plate via bolts.
[0013] The structure of the crossarm upper clamp is that, the crossarm upper clamp includes a crossarm upper clamp main body and a steel connector II articulated with the crossarm upper clamp for connecting the tension device. The crossarm upper clamp main body is provided with a bolt hole corresponded to a connecting hole of the crossarm wrapper plate. , 100141 The structure of the single string clamp is that the single string clamp includes a single string clamp main body, and each of two sides of the single string clamp main body is provided with a wing plate. An end of the wing plate is provided with a pin hole for connecting the tension device. An insert plate with a clamping groove II is fixedly connected to a lower portion of the main body, and a lower end portion of the insert plate is provided, at a position corresponded to that of the connecting hole on the V-string yoke plate, with a pin hole.
[0015] The structure of the crossarm end clamp is that the crossarm end clamp includes a crossarm end clamp main body, and each of two sides of the crossarm end clamp main body is provided with a wing plate. An end of the wing plate is provided with a pin hole for connecting the tension device. An insert plate with a clamping groove II is fixedly connected at a lower portion of the main body, and a lower end portion of the insert plate is provided, at a position corresponded to that of a connecting hole on a towing plate, with a pin hole.
[0016] The structure of the knife-like clamp is that a handle end of the knife-like clamp is provided with a pin hole for connecting the tension device, and a head end of the knife-like clamp is provided with a clamping groove II for clamping a wire end yoke plate. The head end and two side walls of the clamping groove III are configured to have a bend shape.
[0017] The structure of the closed clamp is that the closed clamp includes a closed clamp main body and an upper cover arranged on the closed clamp main body. One end of the upper cover is movably connected with the closed clamp main body via a pin shaft, and the other end of the = 10 upper cover is fixedly connected with the closed clamp main body via a bolt. A through hole for receiving an insulator is formed between the closed clamp main body and the upper cover. Each of two end portions of the main body is provided with a pin hole for connecting the tension device. An inner side of the pin hole is provided with a lifting device for lifting the insulator. The lifting device is a support fixed on the closed clamp main body, and the support is provided with a pulley wheel for hanging cables.
[0018] The structure of the wire end clamp is that the wire end clamp includes a wire end clamp main body and a plate turning clamp arranged on the wire end clamp main body.
One end of the plate turning clamp is movably connected with the wire end clamp main body via a pin shaft, and the other end thereof is fixedly connected with the wire end clamp main body via a bolt. A
through hole for receiving a wire end yoke plate is formed between the wire end clamp main body and the plate turning clamp. Each of the wire end clamp main body and the plate turning clamp is provided, at a position corresponded to that of a nut on the wire end yoke plate, with a hole. Each of two end portions of the wire end clamp main body is movably connected with a steel connector III for connecting the tension device.
[0019] The improvement of the tension device lies in that: the tension device includes a mechanical transmission screw rod and a hydraulic device connected to one end of the mechanical transmission screw rod via a locating pin or an insulation pulling rod.
[0020] With the above technical solutions, the present application has the following technical progresses.
[0021] Based on characters of the direct current transmission line such as the tower-shaped structure, the hanging manner of the insulator string and parameters of the earth wire, the present application provides a maintenance tool configured for the 660kV direct current transmission line and used in case of an outage. The maintenance tool according to the present application can be used to replace the V type single insulator string, the double insulator strings, the long rod insulator, or the like at the same time, and has advantages such as a proper structure, a high overall strength, a small volume, a light weight and a reliable operation, thereby providing a reliable guarantee for the safe commissioning as well as the routine maintenance after the commissioning of the 660kV direct current transmission line.
[0022] The arrangement of the lifting device on the closed clamp enables the operator to lift a heavy long rod insulator during the replacing operation of the long rod insulator, which reduces the labor intensity and increases the working efficiency of the operator. The tension device is configured to be a composition of the mechanical transmission screw rod and the hydraulic device for shortening or enlarging idle strokes of the clamps, which overcomes the disadvantages that the hydraulic transmission system has a slow transmission speed when being used for transmitting a large mechanical load, and reduces the working time of the operator when working high above the ground. Besides, the structure has a function of mutual protection, that is, when one of the transmission mechanisms fails, the normal work of the other transmission mechanism would not be influenced, thereby the operation reliability is greatly improved. Further, since the tension device is assembled from separate structures, when the tension device is in idle, the separate structures may be stored separately, thereby facilitating the replacement and the maintenance.
BRIEF DESCRIPTION OF THE DRAWrNGS
[0023] Figure 1 is a structural schematic view of a V-string upper clamp according to the present application;
[0024] Figure 2 is a structural schematic view of a crossarm upper clamp according to the present application;
[0025] Figure 3 is a front view of a single string clamp according to the present application;
[0026] Figure 4 is a structural schematic view of a knife-like clamp according to the present application;
[0027] Figure 5 is a top view of Figure 4;
[0028] Figure 6 is a structural schematic view of a closed clamp according to the present application;
[0029] Figure 7 is a structural schematic view of a wire end clamp according to the present application;
[0030] Figure 8 is a bottom view of Figure 7;
[0031] Figure 9 is a connecting relationship diagram for replacing a V type single insulator string according to the present application;
[0032] Figure 10 is a connecting relationship diagram for replacing an inner string of a double insulator strings according to the present application;
[0033] Figure 11 is a connecting relationship diagram for replacing an outer string of a double insulator strings according to the present application;
[0034] Figure 12 is a connecting relationship diagram for replacing a long rod insulator according to the present application;
[0035] Figure 13 is a connecting relationship diagram for replacing a first insulator at a wire end according to the present application, and [0036] Figure 14 is a connecting relationship diagram for replacing a first insulator at a crossarm end according to the present application.
[0037] Reference numbers in the figures:
1. V-string upper clamp, 11. V-string upper plate, 12. V-string lower plate, 13. steel connector I, = 14. clamping groove I, 2. crossarm upper clamp, 21. crossarm upper clamp main body, = 22. steel connector II, 3. single string clamp, 31. single string clamp main body, 32. wing plate, 33. clamping groove II, 34. insert plate, 4. knife-like clamp, 41. clatnping groove III, 5. closed clamp, 51. closed clamp main body, 52. upper cover, 53. support, 54. pulley wheel, 7. wire end clamp, 71. wire end clamp main body, 72. plate turning clamp, 73. steel connector III, 81. wire end yoke plate, 82. crossarm wrapper plate, 83. towing plate, 84. mechanical transmission screw rod, 85. hydraulic device, 86. insulation pulling rod, 87. V-string yoke plate.
DETAILED DESCRIPTION
[0038] The present application will be illustrated in detail hereinafter in conjunction with the accompanying drawings and the embodiments.
[0039] A maintenance tool for the direct current transmission line includes a clamping device and a tension device. The clamping device is configured to be clamped at two sides of an insulator string, and the tension device is configured to be connected between the clamping device. The clamping device includes a V-string upper clamp 1, a crossarm upper clamp 2, a single string clamp 3, a knife-like clamp 4, a closed clamp 5, and a wire end clamp 7, among which the single string clamp, the wire end clamp and the closed clamp are made of a TC4 titanium alloy material which has characters such as a high strength, a good plasticity, a light weight, a small volume and a high load bearing capacity, and facilitates working high above the ground.
[0040] The V-string upper clamp 1 is fixedly connected on a fitting-hanging point angle steel at a side of a tower body, and the structure thereof is shown in Figure 1. The V-string upper clamp includes a V-string upper plate 11, a V-string lower plate 12, and a steel connector I 13. The fitting-hanging point angle steel at the side of the tower body is located between the V-string upper plate 11 and the V-string lower plate 12. The inner end face of the V-string upper plate 11 is provided with a clamping groove I corresponded to the fitting-hanging point angle steel at the side of the tower body. An outer end face of the V-string lower plate 12 is articulated with the steel connector I 13. The other end of the steel connector I is provided with a pin hole for connecting the tension device. Two ends of the V-string upper plate are connected with two ends of the V-string lower plate via bolts.
[0041] The crossarm upper clamp 2 is fixedly connected on a crossarm wrapper plate 82, and the structure of the crossarm upper clamp is shown in Figure 2. The crossarm upper clamp includes a crossarm upper clamp main body 21 and a steel connector II 22 movably connected with the crossarm upper clamp main body 21. The crossarm upper clamp includes two triangular aluminum alloy plates which are arranged corresponded to each other, and the steel connector II
is located between the two triangular ahnninum alloy plates. One end of the steel connector II is movably connected with one corner of each of the two triangular aluminum alloy plates via a pin shaft. Each triangular aluminum alloy plate is provided with a pin hole corresponded to a connecting hole on the crossarm wrapper plate. When connecting the elements, the crossarm wrapper plate is inserted between the two triangular aluminum alloy plates, and is connected with the triangular aluminum alloy plates via bolts which are fixed in the pin holes.
[0042] The single string clamp 3 is fixedly connected on a V-string yoke plate 87 or a towing plate 83, and the structure of the single string clamp is shown in Figure 3.
The single string clamp 3 includes a single string clamp main body 31, a wing plate 32 and an insert plate 34. Both sides of the single string clamp main body 31 are provided with wing plates 32. An end portion of the =
wing plate is provided with a pin hole for connecting the tension device. The insert plate 34 is = fixedly connected at a lower portion of the single string clamp main body 31, and a lower portion of the insert plate 34 is formed with a clamping groove II 33. A lower end portion of the insert plate is provided, at a position corresponded to that of the connecting hole on the V-string yoke plate or the towing plate, with a pin hole, thereby two insulator strings of the single V-string may be replaced simultaneously.
[0043] The knife-like clamp 4 is fixedly connected to the V-string yoke plate 87, and the structure of the knife-like clamp is shown in Figure 4 and Figure 5. The handle end of the knife-like clamp 4 is provided with a pin hole for connecting the tension device, and the head end of the knife-like clamp is provided with a clamping groove III for clamping a wire end yoke plate.
The head end portion and two side walls of the clamping groove III have a bend shape. To use the knife-like clamp, the V-string yoke plate 87 is inserted in the clamping groove III, and the bends at the head end portion are hooked to the bolt on the V-string yoke plate;
meanwhile, a pulling force opposite to the direction of the force exerted on the bolt is applied to the handle end of the knife-like clamp, thereby the knife-like clamp is fixedly connected with the V-string yoke plate.
[0044] The closed clamp 5 is sleeved on a steel cover of an insulator, and the structure of the closed clamp is shown in Figure 6. The closed clamp includes a closed clamp main body 51 and an upper cover 52 arranged on the closed clamp main body. One end of the upper cover is movably connected with the closed clamp main body via a pin shaft, and the other end of the upper cover is fixedly connected with the closed clamp main body via a bolt. A
through hole for receiving an insulator is formed between the closed clamp main body and the upper cover. Each of two end portions of the main body is provided with a pin hole for connecting the tension device. An inner side of the pin hole is provided with a lifting device for lifting the insulator. The lifting device is a support 53 fixed on the closed clamp main body, and the support is provided with a pulley wheel 54 for hanging a cable.
[0045] The wire end clamp 7 is fixedly connected on a wire end yoke plate 81, as shown in Figure 7 and Figure 8. The wire end clamp includes a wire end clamp main body 71 and a plate turning clamp 72. The plate turning clamp 72 is arranged on the wire end clamp main body. One end of the plate turning clamp is movably connected with the wire end clamp main body 71 via a pin shaft, and the other end thereof is fixedly connected with the wire end clamp main body via a bolt. A through hole for receiving the wire end yoke plate is formed between the wire end clamp main body and the plate turning clamp. Each of the wire end clamp main body 71 and the plate turning clamp 72 is provided, at a position corresponded to that of the nut on the wire end yoke plate, with a hole. Each of the two end portions of the wire end clamp main body 71 is movably connected with a steel connector III 73 for connecting the tension de'Vice.
100461 The tension device is connected between the V-string upper clamp and the single string clamp as well as between the crossarm upper clamp and the single string clamp.
The tension device is a combination of a mechanical transmission screw rod 84 and a hydraulic device 85, and the mechanical transmission screw rod is connected to the hydraulic device via an insulation pulling rod 86.
First Embodiment 100471 In a case that the present application is provided for replacing a V
type single insulator string on a 660kV direct current transmission line, a combination of the V-string upper clamp 1, the crossarm upper clamp 2, the single string clamp 3 and two tension devices is used, as shown in Figure 9.
[0048] The insert plate 34, having the clamping groove II 33, of the single string clamp 3 is firstly connected on the V-string yoke plate 87, such that the connecting hole on the V-string yoke plate 87 is aligned with the pin holes of the single string clamp 3, and then a bolt is passed through the pin holes, thereby fixedly connecting the single string clamp 3 on the V-string yoke plate 87.
[0049] The fitting-hanging point angle steel at the side of the tower body side is located between the V-string upper plate 11 and the V-string lower plate 12, such that the vertical end of the angle steel is clamped in the clamping groove I of the V-string upper plate 11. And then the two ends of the V-string upper plate 11 are fixedly connected with the two ends of the V-string lower plate 12 via bolts.
[0050] The crossarm wrapper plate is inserted between the two triangular aluminum alloy plates of the crossarm upper clamp 2, such that pin holes on the aluminum alloy plates are corresponded to the connecting hole of the crossarm wrapper plate. Then a bolt is inserted in the pin holes and the connecting hole such that the crossarm upper clamp is fixedly connected to the crossarm wrapper plate.
[00511 Next, the assembling of the first tension device follows. In particular, one end of the hydraulic device 85 is movably connected to an end of the steel connector I
13, having a pin hole, of the V-string upper clamp 1 via a pin shaft, the other end of the hydraulic device 85 is fixedly connected to one end of the mechanical transmission screw rod 84 via the insulation pulling rod, and the other end of the mechanical transmission screw rod 84 is movably connected with one pin hole of the single string clamp 3 via a pin shaft. Then, the second tension device is assembled similarly. One end of the hydraulic device 85 is movably connected to an end of the steel connector II 22, having a pin hole, of the crossarm upper clamp 2 via a pin shaft, the other end of the hydraulic device 85 is fixedly connected with one end of the mechanical transmission screw rod 84 via the insulation pulling rod, and the other end of the mechanical transmission screw rod 84 is movably connected with the other pin hole of the single string clamp 3 via a pin shaft.
[0052] After the connecting operation is finished, the screw rod is tightened or the hydraulic device is actuated such that the V-string upper clamp, the crossarm upper clamp and the single string clamp are tensioned with respect to each other, allowing the inner string insulator being relaxed and no tension being applied thereon. Thereby the V type single insulator string may be replaced.
Second Embodiment = [0053] While replacing the double insulator strings on a 660kV direct current transmission line with the present application, different compositions are made based on the inner string or the outer string to be replaced.
[0054] While replacing the inner string of the double insulator strings, a combination of the V-string upper clamp 1, the knife-like clamp 4 and the tension device is used, as shown in Figure 10. Firstly, the V-string yoke plate 87 is inserted into the clamping groove III of the knife-like clamp 4, and the bend at the head end portion is hooked to the bolt on the V-string yoke plate.
Meanwhile, a pulling force which is opposite to the direction of the force exerted on the bolt is applied to the handle end of the knife-like clamp, to thereby fixedly connecting the knife-like clamp with the V-string yoke plate.
[0055] The V-string upper clamp 1 and the fitting-hanging point angle steel at the side of the tower boy are connected in the same manner as that in the first embodiment.
[0056] Then assembling the tension device. One end of the hydraulic device 85 is movably connected to an end of the steel connector I 13, having a pin hole, of the V-string upper clamp 1 = via a pin shaft, the other end of the hydraulic device 85 is fixedly connected to one end of the mechanical transmission screw rod 84 via the insulation pulling rod, and the other end of the mechanical transmission screw rod 84 is movably connected to the pin hole of the handle end of the knife-like clamp via a pin shaft.
[0057] After the connecting operation is finished, the screw rod is tightened or the hydraulic device is actuated such that the V-string upper clamp and the knife-like clamp are tensioned, =
allowing the inner string insulator being relaxed and no tension force being applied thereon.
Thereby the inner string may be replaced.
[0058] While replacing the outer string of the double insulator strings, a combination of the crossarm upper clamp 2, the knife-like clamp 4 and a tension device is used, as shown in Figure 11. Firstly, the V-string yoke plate 87 is inserted into the clamping groove III of the knife-like clamp 4, and the bend at the head end portion is hooked to the bolt on the V-string yoke plate.
Meanwhile, a pulling force which is opposite to the direction of the force exerted on the bolt is applied to the handle end of the knife-like clamp, to thereby fixedly connecting the knife-like clamp with the V-string yoke plate.
[0059] The crossarm upper clamp 2 and the crossarm wrapper plate 82 are connected in the same manner as that in the first embodiment.
[0060] Then one end of the hydraulic device 85 is movably connected to an end of the steel connector II 22, having a pin hole, of the crossann upper clamp 2 via a pin shaft, the other end of the hydraulic device 85 is fixedly connected to one end of the mechanical transmission screw rod 84 via the insulation pulling rod, and the other end of the mechanical transmission screw rod 84 is movably connected to the pin hole at the handle end of the knife-like clamp via a pin shaft.
[0061] After the connecting operation is finished, the screw rod is tightened or the hydraulic device is actuated such that the crossarm upper clamp and the knife-like clamp are tensioned, allowing the outer string insulator being relaxed and no tension force being applied thereon.
Thereby the outer string may be replaced.
Third Embodiment [0062] A single insulator or multiple insulators in the middle portion, or a long rod insulator on a 660kV direct current transmission line may be replaced simply by two closed clamps 5 and two tension devices according to the present application, as shown in Figure 12.
The upper cover of each closed clamp 52 is opened such that it is rotated, about a pin shaft, to one side of the closed clamp main body. Then the two closed clamps are mounted on the steel covers at the two ends of the insulator, respectively, and then each upper cover is covered to its original position and is fixedly connected with the closed clamp main body via a bolt. Thereby the closed clamps are fixedly connected on the insulator.
[0063] Then the mechanical transmission screw rods and the hydraulic devices of the two tension devices are respectively connected to the pin holes at two ends of each closed clamp 5, and then the insulation pulling rod 86 is connected between the mechanical transmission screw rod and the hydraulic device, such that the insulator can be tensioned in a case that the insulator is long.
[0064] After the connecting operation is finished, the screw rod is tightened or the hydraulic device is actuated such that the closed clamps are tensioned, allowing the insulator being relaxed and no tension force being applied thereon. Thereby the insulator may be replaced.
[0065] In a case that the insulator is heavy, the lifting device on the closed clamp may be used to lift the insulator, which saves the labor cost and improves the safety of the operation.
Fourth Embodiment = [0066] A first insulator at the wire end on a 660kV direct current transmission line is replaced with the cooperation of the wire end clamp 7, the closed clamp 5 and the tension device = according to the present application, as shown in Figure 13. The differences between the present embodiment and the third embodiment lie in that, one closed clamp is clamped on the steel cover of the first insulator at the wire end; then the plate turning clamp 72 of the wire end clamp 7 is rotated around the pin shaft to one side of the wire end clamp main body 71, and the wire end yoke plate is clamped between the main body and the plate turning clamp of the wire end clamp 7 such that the nut on the wire end yoke plate is clamped into the bolt hole of the wire end clamp.
And then the other end of the plate turning clamp is fixedly connected with the wire end clamp main body via a bolt.
Fifth Embodiment = 20 [0067] According to the present application, a first insulator at a crossarm side on a 660kV
direct current transmission line may be replaced by the cooperation of the crossarm end clamp, the closed clamp and the tension device, as shown in Figure 14. The differences between the present embodiment and the fourth embodiment lie in that, one closed clamp is clamped on the steel cover of the first insulator at the crossarm end. Then the towing plate is clamped in the clamping groove 11 of the crossarm end clamp. And then the single string clamp is fixedly connected to the towing plate via a bolt.

Claims (8)

1. A maintenance tool for a direct current transmission line, comprising a clamping device configured to be clamped at two sides of an insulator string and a tension device connected between the clamping device, wherein the clamping device comprise: a V-string upper clamp (1), a crossarm upper clamp (2), a single string clamp (3), a knife-like clamp (4), a closed clamp (5) and a wire end clamp (7), and the single string clamp, the wire end clamp and the closed clamp are made of a TC4 titanium alloy material; and the tension device is a mechanical transmission screw rod;
when replacing a V type single insulator string, the V type single insulator string is replaced by a combination of the V-string upper clamp, the crossarm upper clamp, the single string clamp and two tension devices, wherein the V-string upper clamp (1) is fixedly connected to a fitting-hanging point angle steel at a side of a tower body; the crossarm upper clamp (2) is fixedly connected to a crossarm wrapper plate; the single string clamp (3) is fixedly connected to a V-string yoke plate; and the tension devices are connected between the V-string upper clamp and the single string clamp and between the crossarm upper clamp and the single string clamp, respectively;
when replacing double insulator strings, the double insulator strings are replaced by a combination of the V-string upper clamp, the crossarm upper clamp, the knife-like clamp and two tension devices, wherein the V-string upper clamp (1) is fixedly connected to the fitting-hanging point angle steel at a tower body side; the crossarm upper clamp (2) is fixedly connected to the crossarm wrapper plate; the knife-like clamp (4) is mounted on the V-string yoke plate; and the tension devices are connected between the V-string upper clamp and the knife-like clamp and between the crossarm upper clamp and the knife-like clamp, respectively;
when replacing a single insulator or multiple insulators in the middle portion, or a long rod insulator, two closed clamps and two tension devices are used, wherein the closed clamps (5) are mounted on steel covers of an insulator; and the tension devices are connected between the two closed clamps;
when replacing a first insulator at a crossarm end, the first insulator is replaced by a cooperation of a crossarm end clamp, the closed clamp and two tension devices, wherein the single string clamp (3) is fixedly connected to a towing plate; the closed clamp (5) is sleeved on a steel cover of an insulator; and the tension devices are connected between the single string clamp and the closed clamp; and when replacing a first insulator at a wire end, the first insulator is replaced by a cooperation of the wire end clamp, the closed clamp and two tension devices, wherein the wire end clamp (7) is fixedly connected to a wire end yoke plate; the closed clamp (5) is sleeved on a steel cover of the insulator; and the tension devices are connected between the wire end clamp and the closed clamp.
2. The maintenance tool for the direct current transmission line according to claim 1, wherein the V-string upper clamp (1) comprises a V-string upper plate (11) and a V-string lower plate (12) located at two sides of the fitting-hanging point angle steel at the side of the tower body, wherein an inner end face of the V-string upper plate (11) is provided with a clamping groove I
(14) corresponded to the fitting-hanging point angle steel at the side of the tower body; and an outer end face of the V-string lower plate (12) is articulated with a steel connector I (13), while the other end of the steel connector I is provided with a pin hole for connecting the tension device;
and two ends of the V-string upper plate are connected with two ends of the V-string lower plate via bolts.
3. The maintenance tool for the direct current transmission line according to claim 1, wherein the crossarm upper clamp (2) comprises a crossarm upper clamp main body (21) and a steel connector II (22) articulated with the crossarm upper clamp main body (21) for connecting the tension device, and the crossarm upper clamp main body is provided with a bolt hole corresponded to a connecting hole of the crossarm wrapper plate.
4. The maintenance tool for the direct current transmission line according to claim 1, wherein the single string clamp (3) comprises a single string clamp main body (31), and each of two sides of the single string clamp main body is provided with a wing plate (32), wherein an end of the wing plate is provided with a pin hole for connecting the tension device; and an insert plate (34) with a clamping groove II (33) is fixedly connected to a lower portion of the main body, and a lower end portion of the insert plate is provided, at a position corresponded to that of the connecting hole on the V-string yoke plate, with a pin hole.
5. The maintenance tool for the direct current transmission line according to claim 1, wherein a handle end of the knife-like clamp (4) is provided with a pin hole for connecting the tension device, a head end of the knife-like clamp is provided with a clamping groove III (41) for clamping a wire end yoke plate, and the head end and two side walls of the clamping groove III
are configured to have a bend shape.
6. The maintenance tool for the direct current transmission line according to claim 1, wherein the closed clamp (5) comprises a closed clamp main body (51) and an upper cover (52) arranged on the closed clamp main body, wherein one end of the upper cover is moveably connected with the closed clamp main body via a pin shaft, and the other end of the upper cover is fixedly connected with the closed clamp main body via a bolt; a through hole for receiving an insulator is formed between the closed clamp main body and the upper cover;
and each of two end portions of the main bodY is provided with a pin hole for connecting the tension device, an inner side of the pin hole is provided with a lifting device for lifting the insulator, the lifting device is a support (53) fixed on the closed clamp main body, and the support is provided with a pulley wheel (54) for hanging cables.
7. The maintenance tool for the direct current transmission line according to claim 1, wherein the wire end clamp (7) comprises a wire end clamp main body (71) and a plate turning clamp (72) arranged on the wire end clamp main body, and wherein one end of the plate turning clamp is movably connected with the wire end clamp main body (71) via a pin shaft, and the other end of the plate turning clamp is fixedly connected with the wire end clamp main body via a bolt; a through hole for receiving a wire end yoke plate is formed between the wire end clamp main body and the plate turning clamp; each of the wire end clamp main body (71) and the plate turning clamp (72) is provided, at a position corresponded to that of a nut on the wire end yoke plate, with a hole; and each of two end portions of the wire end clamp main body (71) is movably connected with a steel connector III (73) for connecting the tension device.
8. The maintenance tool for the direct current transmission line according to any one of claims 1 to 7, wherein the tension device includes a mechanical transmission screw rod and a hydraulic device connected to one end of the mechanical transmission screw rod.
CA 2823132 2010-12-28 2011-11-29 Maintenance tool used for direct current transmission line Expired - Fee Related CA2823132C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2010106100039A CN102136695B (en) 2010-12-28 2010-12-28 Overhauling tool used for +/-660kV direct-current transmission line
CN201010610003.9 2010-12-28
PCT/CN2011/083172 WO2012088986A1 (en) 2010-12-28 2011-11-29 Maintenance tool used for direct current transmission line

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CA2823132C true CA2823132C (en) 2014-11-25

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Publication number Priority date Publication date Assignee Title
CN202014055U (en) * 2010-12-28 2011-10-19 河北省电力公司超高压输变电分公司 Overhauling device of V-shaped double-string insulator for +-660KV direct current transmission line
CN202014054U (en) * 2010-12-28 2011-10-19 河北省电力公司超高压输变电分公司 Overhaul tool for dead end insulator on +/- 660kV DC power transmission line
CN102136695B (en) * 2010-12-28 2012-11-28 河北省电力公司超高压输变电分公司 Overhauling tool used for +/-660kV direct-current transmission line
CN103618251A (en) * 2013-11-27 2014-03-05 国家电网公司 Technology for electrified overhaul of +-800kV ultrahigh voltage direct-current transmission line
JP6590704B2 (en) * 2016-01-12 2019-10-16 株式会社中電工 Tip tool connection structure
CN111725737A (en) * 2020-07-07 2020-09-29 国网湖南省电力有限公司 Device and method for live replacement of extra-high voltage direct current v-type duplex composite insulator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3557311B2 (en) * 1996-05-30 2004-08-25 中部電力株式会社 Replacement method of V-suspended insulator and tool used in the method
JP4073086B2 (en) * 1998-08-10 2008-04-09 中部電力株式会社 Insulator replacement device for double tension insulators
CN101174761B (en) * 2007-10-30 2010-06-23 重庆市电力公司超高压局 High-voltage power line tension insulator string forward spin live-wire altering method
CN101651308B (en) * 2009-08-12 2011-05-11 安徽送变电工程公司 Tension resistant four-serial string whole composite insulator replacing device
CN201629516U (en) * 2009-12-15 2010-11-10 湖北省电力公司超高压输变电公司 Three-connected extension-resisting clamp for extra HVDC transmission line
CN201584701U (en) * 2009-12-15 2010-09-15 云南电网公司大理供电局 Tool for replacing 'V' string insulator of 220kV line in live state
CN102136695B (en) * 2010-12-28 2012-11-28 河北省电力公司超高压输变电分公司 Overhauling tool used for +/-660kV direct-current transmission line

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CN102136695B (en) 2012-11-28

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