CN108462099B - Method for replacing double-connection double-hanging-point suspension string insulator of +/-800 kV extra-high voltage line - Google Patents
Method for replacing double-connection double-hanging-point suspension string insulator of +/-800 kV extra-high voltage line Download PDFInfo
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- CN108462099B CN108462099B CN201810161157.0A CN201810161157A CN108462099B CN 108462099 B CN108462099 B CN 108462099B CN 201810161157 A CN201810161157 A CN 201810161157A CN 108462099 B CN108462099 B CN 108462099B
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- 239000012212 insulator Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000725 suspension Substances 0.000 title claims abstract description 10
- 238000004873 anchoring Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000004020 conductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000010355 oscillation Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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Abstract
The invention provides a method for replacing a +/-800 kV extra-high voltage line duplex double-hanging-point suspension string insulator, which comprises the steps of assembling a bypass stress system; installing a bypass stress system; anchoring the auxiliary hardware string tool on the cross arm side extension plate; tightening the bypass stressed system; after the bypass stress system is adjusted, the insulator string to be replaced is dismantled, and then the whole string is replaced on the ground; after the insulator string is replaced, adjusting a large-load mechanical tightener to loosen a bypass stress system, and dismantling the bypass stress system and an auxiliary hardware string tool; the invention can replace the damaged insulator string in the shortest time, and is convenient, rapid and safe.
Description
Technical Field
The invention relates to the field of electric power overhaul, in particular to a method for replacing a duplex double-hanging-point suspension string insulator of a +/-800 kV extra-high voltage line, which is particularly suitable for a +/-800 kV extra-high voltage eight-split conductor direct-current line.
Background
The +/-800 kV ultrahigh-voltage direct-current transmission line is one of 12 key power transmission channels determined by the national atmospheric pollution prevention action plan, is an important gripper for deeply promoting the construction of the shanghai temple energy chemical industry base, and has important practical significance for promoting the development of the whole-flag economic society.
The high-capacity electric power system of the +/-800 kV extra-high voltage transmission line has a decisive influence on the safety of the power grid when the power system is connected into the power grid, and once a power accident occurs, the power grid generates great fluctuation, oscillation and even cracking, so how to improve the power supply reliability and strengthen the operation maintenance technology adopts the live working technology to realize uninterrupted maintenance and realize uninterrupted continuous power supply, which becomes a problem to be solved, namely about 9.6 ~ 11 meters of the +/-800 kV composite insulator string, and an extra-high voltage electric field is formed from the insulator string to the surrounding space of a live wire, and a worker is in the electric field to change the linear insulator string in a live way.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for replacing a +/-800 kV extra-high voltage line duplex double-hanging-point suspension string insulator, which can replace a damaged insulator string in the fastest time and is convenient, rapid and safe.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention comprises the following steps:
a) assembling a bypass stress system, wherein the bypass stress system comprises a large cutter clamp fixed at a live wire yoke plate, a construction hanging hole plate fixed with a cross arm and a tensioning device arranged between the large cutter clamp and the construction hanging hole plate; the tensioning device comprises a first tensioning device and a second tensioning device which are identical in structure and symmetrically arranged; the first tensioning device comprises a hydraulic wire grip and a large-load mechanical wire grip fixedly connected with the lower end of a cylinder body of the hydraulic wire grip through an insulating pull rod; a groove is formed in the middle of the construction hanging hole plate; angle measuring rods are arranged at the same positions of the lower sides of the large-load mechanical tighteners of the first tensioning device and the second tensioning device in a hanging mode; a reference rod perpendicular to the high-load mechanical wire grip is fixedly arranged at the suspension point of the angle measuring rod of the second tensioning device;
b) the bypass stress system is lifted from the outer side of the replaced insulator string, is hung to a cross arm of an iron tower through a transmission insulating rope, a construction hanging hole plate is connected to a cross arm connecting point, and then the large knife clip is anchored on a connecting plate of an electrified wire;
c) anchoring the auxiliary hardware string tool on the cross arm side extension plate;
d) manually operating the large-load mechanical tighteners of the first tensioning device and the second tensioning device to quickly tighten a large residual force, and then finely adjusting the large residual force through the hydraulic tighteners of the first tensioning device and the second tensioning device until the angle measuring rod is overlapped with the reference rod; at the moment, the first tensioning device and the second tensioning device are completely stressed the same;
e) after the bypass stress system is adjusted, the insulator string to be replaced is dismantled, and then the whole string is replaced on the ground;
f) and after the insulator string is replaced, adjusting the large-load mechanical tightener to loosen the bypass stress system and remove the bypass stress system and the auxiliary hardware string tool.
Further, the large knife clip is of a hook-shaped structure and comprises two separated inserting plates A, an inserting plate B and a straight side plate C, and the large-load mechanical tightener of the first tensioning device is connected to the straight side plate C through a connector; the large-load mechanical tightener of the second tensioning device is connected to the inserting plate A through a connector; when the insulator string replacing device is installed, the distance between the first tensioning device and the insulator string to be replaced is equal to the distance between the second tensioning device and the insulator string to be replaced.
Furthermore, the insulating pull rod is of a high-strength filling foam multilayer pipe structure.
Further, supplementary gold utensil cluster instrument cross-section is the n type, including set up in the support connecting rod in the middle with the symmetry set up in support connecting rod both ends and with support connecting rod integrated into one piece's connector structure.
The invention has the following technical effects:
(1) the +/-800 kV extra-high voltage eight-split conductor direct-current circuit is different from the conventional six-split conductor, the conductor is JL1/G2A-1250/100, and the requirements on mechanical strength, insulating property and electric resistance are different; the mechanical strength, the insulating property and the point resistance of the device can meet the circuit requirements;
(2) the traditional maintenance and replacement tool is only provided with a bypass stress system, after the bypass stress system is installed, because the bypass stress system deviates from the stress point of the original insulator string to be replaced, as shown in figure 4, the insulator strings 1 and 2 bear tension before replacement, the stress points are A and B and are symmetrical about a lead, after the bypass stress system 1 replaces the insulator string to be replaced, namely the insulator string 2, the stress points are transferred from the point B to the point C, at the moment, the stress points are A and C, because the stress points A and C are not symmetrical, included angles can be generated on lines at two sides due to non-uniform stress, in order to avoid the situation, as shown in figure 5, the bypass stress system is arranged into two symmetrical groups of tensioning devices, namely a first tensioning device and a second tensioning device, and because an angle measuring rod and a reference rod are arranged, the first tensioning device and the second tensioning device can be ensured to be completely equal in stress, at the moment, the stress of the insulator string to be replaced can be transferred to a bypass stress system without changing, so that the leads on the two sides are kept in the original shape, and no included angle is generated;
(3) because the bypass stress system is provided with two symmetrical tensioning devices, the stress of the original insulator string to be replaced is divided into two groups of tensioning devices, the stress is reduced, and the service life is prolonged;
(4) compared with the traditional insulator replacing mode, the method has the advantages that an auxiliary hardware string tool is added, a bypass stress system is tightened, the insulator string is loosened, the insulator string is directly picked and falls to the ground, the hardware string is generally overlong and overweight in an extra-high voltage double-hanging-point circuit, however, when the insulator string is picked off, the hardware string on the cross arm side is opened and is in a free hanging state, when a new insulator string is replaced, the hardware string is quite difficult to return to a working position, the auxiliary hardware string tool is arranged, and the whole replacing method is particularly convenient, namely the hardware string is always in the working position;
(5) when the bypass stressed system is in an initial installation state, a large margin is quickly tightened by the manual mechanical tightener, and when the bypass is stressed, the hydraulic tightener is used for tightening, so that the stroke of the hydraulic tightener can be shortened, the volume and the weight are reduced, the working time is shortened, the device is reasonable in structure, the method is convenient and efficient, and the working efficiency is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of a bypass force system according to the present invention;
FIG. 2 is a schematic diagram of an auxiliary hardware string tool structure according to the present invention;
FIG. 3 is a schematic view of the present invention in use;
FIG. 4 is a schematic diagram of a conventional insulator string replacement;
FIG. 5 is a schematic representation of the insulator string replacement of the present invention;
FIG. 6 is a schematic view of the angle measuring rod and reference rod mounting structure.
In the drawings: 1-a hydraulic wire tightener; 2-insulating pull rod; 3-large load mechanical tightener; 4-an auxiliary hardware string tool; 4-1 supporting the connecting rod; 4-2 connector structure; 5-large knife clip; 6, constructing a hole hanging plate; 7-an angle measuring rod; 8-reference bar; 9-a groove; a-inserting plate A; b, inserting a board B; c-straight plate C; 10-insulator string 1; 11-insulator string 2; 12-traditional bypass force systems; 13-first tensioning means; 14-a second tensioning device; 15-conducting wire.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings.
As shown in fig. 1-3, the present invention comprises the steps of:
a) assembling a bypass stress system, wherein the bypass stress system comprises a large knife clip 5 fixed at a live wire yoke plate, a construction hanging hole plate 6 fixed with a cross arm and a tensioning device arranged between the large knife clip 5 and the construction hanging hole plate 6; the tensioning device comprises a first tensioning device and a second tensioning device which are identical in structure and symmetrically arranged; the first tensioning device 13 comprises a hydraulic wire grip 1 and a large-load mechanical wire grip 3 fixedly connected with the lower end of a cylinder body of the hydraulic wire grip 1 through an insulating pull rod 2; a groove 9 is formed in the middle of the construction hole hanging plate 6; as shown in fig. 6, an angle measuring rod 7 is suspended at the same position on the lower side of the heavy-load mechanical tightener 3 of the first tensioning device 13 and the second tensioning device, two end points of the angle measuring rod 7 and the heavy-load mechanical tightener 3 of the first tensioning device 13 and the second tensioning device can rotate relatively, and a reference rod 8 perpendicular to the heavy-load mechanical tightener 3 is fixedly arranged at the suspension point of the angle measuring rod 7 of the second tensioning device 14;
b) the bypass stress system is lifted from the outer side of the replaced insulator string, the bypass stress system is hung to a cross arm of an iron tower through a transmission insulating rope, a construction hole hanging plate 6 is connected to a cross arm connecting point, and then the large knife clip 5 is anchored on a connecting plate with an electric lead;
c) anchoring the auxiliary hardware string tool 4 on the cross arm side extension plate;
d) the large-load mechanical tightener 3 of the first tensioning device 13 and the second tensioning device 14 is manually operated to quickly tighten a large residual force, then the hydraulic tightener 1 of the first tensioning device 13 and the second tensioning device 14 is used for fine adjustment until the angle measuring rod 7 is overlapped with the reference rod 8, and at the moment, the leads 15 on the two sides can be kept in the original state without generating an included angle;
e) after the bypass stress system is adjusted, the insulator string to be replaced is dismantled, and then the whole string is replaced on the ground;
f) and after the insulator string is replaced, the large-load mechanical tightener 3 is adjusted to loosen the bypass stress system, and the bypass stress system and the auxiliary hardware string tool 4 are removed.
The large knife clip 5 is of a hook-shaped structure and comprises two separated inserting plates A, an inserting plate B and a straight side plate C, and the large-load mechanical tightener 3 of the first tightening device 13 is connected to the straight side plate C through a connector; the heavy load mechanical tightener 3 of the second tensioning device 14 is connected to the insert plate a through a connector.
The insulating pull rod 2 is of a high-strength filling foam multilayer pipe structure, is made of a patent product ZL 95245540.4' high-strength filling foam multilayer pipe, and has the functions of electrically isolating a live wire from an iron tower and lifting the live wire.
The section of the auxiliary hardware string tool 4 is n-shaped and comprises a support connecting rod 4-1 arranged in the middle and connector structures 4-2 which are symmetrically arranged at two ends of the support connecting rod 4-1 and are integrally formed with the support connecting rod 4-1.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To these
Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A method for replacing a +/-800 kV extra-high voltage line duplex double-hanging-point suspension string insulator is characterized by comprising the following steps:
a) assembling a bypass stress system, wherein the bypass stress system comprises a large knife clip (5) fixed at a live wire yoke plate, a construction hanging hole plate (6) fixed with a cross arm and a tensioning device arranged between the large knife clip (5) and the construction hanging hole plate (6); the tensioning device comprises a first tensioning device (13) and a second tensioning device (14) which are identical in structure and are symmetrically arranged; the first tensioning device (13) comprises a hydraulic wire grip (1) and a large-load mechanical wire grip (3) fixedly connected with the lower end of a cylinder body of the hydraulic wire grip (1) through an insulating pull rod (2); a groove (9) is formed in the middle of the construction hole hanging plate (6); an angle measuring rod (7) is arranged at the same position on the lower side of the large-load mechanical wire grip (3) of the first tensioning device (13) and the second tensioning device (14) in a hanging manner; a reference rod (8) perpendicular to the high-load mechanical wire grip (3) is fixedly arranged at the suspension point of the angle measuring rod (7) of the second tensioning device (14);
b) the bypass stress system is lifted from the outer side of the replaced insulator string, the bypass stress system is hung to a cross arm of an iron tower through a transmission insulating rope, a construction hole hanging plate (6) is connected to a cross arm connecting point, and then the large knife clip (5) is anchored on a connecting plate with an electric lead;
c) anchoring the auxiliary hardware string tool (4) on the cross arm side extension plate;
d) the large-load mechanical tightener (3) of the first tensioning device (13) and the second tensioning device (14) is manually operated to quickly tighten a large residual force, and then the hydraulic tightener (1) of the first tensioning device (13) and the second tensioning device (14) is used for fine adjustment until the angle measuring rod (7) is superposed with the reference rod (8);
e) after the bypass stress system is adjusted, the insulator string to be replaced is dismantled, and then the whole string is replaced on the ground;
f) after the insulator string is replaced, a large-load mechanical tightener (3) is adjusted to loosen a bypass stress system, and the bypass stress system and an auxiliary hardware string tool (4) are removed;
the insulating pull rod (2) is of a high-strength filling foam multilayer pipe structure;
the cross section of the auxiliary hardware fitting string tool (4) is n-shaped and comprises a support connecting rod (4-1) arranged in the middle and connector structures (4-2) symmetrically arranged at two ends of the support connecting rod (4-1) and integrally formed with the support connecting rod (4-1).
2. The method for replacing the duplex double-hanging-point suspension string insulator of the +/-800 kV extra-high voltage line according to claim 1, wherein the large knife clip (5) is of a hook-shaped structure and comprises two separated plug boards A and B and a straight side board C, and the large-load mechanical tightener (3) of the first tightening device (13) is connected to the straight side board C through a connector; and the heavy-load mechanical tightener (3) of the second tensioning device (14) is connected to the inserting plate A through a connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810161157.0A CN108462099B (en) | 2018-02-27 | 2018-02-27 | Method for replacing double-connection double-hanging-point suspension string insulator of +/-800 kV extra-high voltage line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810161157.0A CN108462099B (en) | 2018-02-27 | 2018-02-27 | Method for replacing double-connection double-hanging-point suspension string insulator of +/-800 kV extra-high voltage line |
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| Publication Number | Publication Date |
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| CN108462099A CN108462099A (en) | 2018-08-28 |
| CN108462099B true CN108462099B (en) | 2020-01-24 |
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| CN201810161157.0A Active CN108462099B (en) | 2018-02-27 | 2018-02-27 | Method for replacing double-connection double-hanging-point suspension string insulator of +/-800 kV extra-high voltage line |
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| CN110854734B (en) * | 2019-11-18 | 2021-02-12 | 浙江省送变电工程有限公司 | Method for replacing large yoke plate of strain insulator string of extra-high voltage direct current transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4073086B2 (en) * | 1998-08-10 | 2008-04-09 | 中部電力株式会社 | Insulator replacement device for double tension insulators |
| CN102545102B (en) * | 2012-02-24 | 2014-09-03 | 山西省电力公司检修分公司 | 1000-Kv tension-resistant horizontal insulator charged exchange device |
| CN203456796U (en) * | 2013-08-15 | 2014-02-26 | 国网浙江省电力公司杭州供电公司 | Broadsword fixture for replacing single insulator of duplex insulator string during power failure |
| CN105932599A (en) * | 2016-06-17 | 2016-09-07 | 国网湖南省电力公司带电作业中心 | Tool set capable of replacing insulator chain of ultra-high-voltage transmission line under electrified state and use method for tool set |
| CN205791227U (en) * | 2016-06-17 | 2016-12-07 | 国网湖南省电力公司带电作业中心 | Charged for replacement UHV transmission line insulator chain tool set |
| CN206506228U (en) * | 2016-09-23 | 2017-09-19 | 国家电网公司 | Extra-high voltage levels tetrad strain insulator side of wire isolator hot-line replacing instrument |
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