CN110854734B - Method for replacing large yoke plate of strain insulator string of extra-high voltage direct current transmission line - Google Patents
Method for replacing large yoke plate of strain insulator string of extra-high voltage direct current transmission line Download PDFInfo
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- CN110854734B CN110854734B CN201911129906.2A CN201911129906A CN110854734B CN 110854734 B CN110854734 B CN 110854734B CN 201911129906 A CN201911129906 A CN 201911129906A CN 110854734 B CN110854734 B CN 110854734B
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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 discloses a method for replacing a large yoke plate of a strain insulator string of an extra-high voltage direct current transmission line, and relates to the technical field of power grid transmission line maintenance. The large yoke plate on the tension string of the extra-high voltage direct current transmission line bears the tension of the whole grade of conducting wire, the yoke plate is deformed due to short-time high load caused by heavy ice, heavy wind and the like, the bearing capacity is reduced, and the replacement is urgently needed. The main process of the method comprises the preparation work of entering a field; hanging a grounding wire; the installation construction is performed by a winching mill; the spacer and the small-size side grading ring are disassembled; arranging an anchor system and an insurance system; fixing the insulator and the wire end hardware string; removing the connection between the two connecting plates and the large connecting plate; the large yoke plate is removed and replaced; reinstalling the small-size side grading ring and recovering the sub-conductor spacer; dismantling the temporary anchoring system, the insurance system and the tackle pulley set; and (5) dismantling the working grounding wire and cleaning the field. The method is safe and reliable, can effectively realize the replacement of the large yoke plate of the strain insulator string of the ultra-high voltage direct current transmission line, and ensures the safe and stable operation of the power line.
Description
Technical Field
The invention relates to the technical field of power grid transmission line maintenance, in particular to a method for replacing a large yoke plate of a strain insulator string of an extra-high voltage direct current transmission line.
Background
At present, extra-high voltage direct current transmission lines are increasingly adopted for long-distance power grid transmission, and the stability of line operation has important significance for relieving power supply and demand contradictions and guaranteeing safe and reliable power supply. With the increase of the operation years of the line, the problems in the operation and maintenance of the ultra-high voltage direct current transmission line are more and more obvious, the pole tower structure, the window size, the number of split wires, the form of an insulator string and the like of the ultra-high voltage direct current transmission line have larger differences from the common transmission line in design, and no mature technology can be used for reference at home and abroad.
The yoke plate is a plate-shaped connecting hardware fitting which is used for connecting a plurality of insulator strings or assembling a plurality of stressed branches into a whole. The tension string upper connecting plate bears the tension of the whole grade of lead, and the property of the tension string upper connecting plate is related to the safe and stable operation of the line. Especially under environments such as high mountain heavy ice district, the icing phenomenon appears in the wire easily, because of wire horizontal suspension, during the wire ice-melt, the condition that drops when producing the wire and deicing easily, aggravate the unbalanced tension of wire, make the yoke plate have the short-term high load situation, other calamities such as strong wind also destroy the stress structure of yoke plate easily in addition, make yoke plate bearing load surpass its mechanical strength, lead to yoke plate bending deformation, the bearing capacity descends, can't satisfy the requirement of bearing capacity, urgent need is changed.
Disclosure of Invention
The technical problem to be solved and the technical task to be solved by the invention are to perfect and improve the prior technical scheme, and provide a method for replacing a large yoke plate of a strain insulator string of an extra-high voltage direct current transmission line, so as to ensure the safe and stable operation of a power line. Therefore, the invention adopts the following technical scheme.
A method for replacing a large yoke plate of a strain insulator string of an extra-high voltage direct current transmission line comprises the following steps:
1) before construction, site cleaning, construction appliance and safety measure arrangement are carried out around a construction tower;
2) respectively hanging working grounding wires on a front tension tower and a rear tension tower which are adjacent to the construction tower, and using a Dyneema rope as a string falling prevention safety rope;
3) arranging anchor piles before winching and entering a field;
4) hanging personal security lines by operators, leading out 1 operator, dismantling 4 spacers on the conductor, and hanging the spacers on 2 sub-conductors in the middle; another 1, hanging an insulation pulley from the ground wire top frame by an operator, and transferring the dismantled small-size side equalizing ring and the drainage spacer to the ground by using an insulation rope;
5) arranging adjacent anchor systems on the 2 middle sub-wires respectively, arranging the adjacent anchor systems on the other sub-wires after the systems are stressed, tightening all the adjacent anchor systems, removing the drainage wires, and binding the drainage wires on the rubber-coated rope by using ropes;
6) arranging a safety system on 4 sub-wires, wherein one end of the safety system is fixed on the cross arm, the other end of the safety system is fixed on the wire DB adjusting plate, and the other 2 sub-wires on the outer side are provided with a Dinima rope and connected with the cross arm to serve as safety ropes;
7) the safety system of the middle 4 sub-wires uses a Dyneema rope to reliably fix the four strings of insulators and the metal fittings at the wire ends every 0.4-0.8m away;
8) arranging a wire tightening double-wheel pulley group between the large yoke plate and the sub-conductor, placing a twisting mill, confirming that anchoring is reliable, slowly tightening the twisting mill, removing a connecting hardware fitting of the large yoke plate and the sub-conductor, loosening an insulator string, stressing a safety rope, installing two pairs of half-side clamps at 5-6 porcelain bottles at the conductor end, connecting the two pairs of clamps with the large yoke plate through V-shaped steel wire sleeves, tightening the V-shaped steel wire sleeves, and then removing the connection between the two yoke plates and the large yoke plate;
9) the turning tackle is hung in a V shape on the middle 2 sub-conductors, the large yoke plate is tied up with a lifting steel wire sleeve by a three-point lifting method, the tower leg turning tackle, the ground wire top frame tackle and the conductor turning tackle are utilized, the lifting steel wire rope is slowly tightened, the large yoke plate and the conductor connecting hardware are removed, the steel wire rope is slowly loosened, the removed damaged large yoke plate is hung down, then a new large yoke plate is hoisted, after the yoke plate is in place, the connection between the two yoke plates and the large yoke plate is recovered by utilizing the fixture and the V-shaped steel wire sleeve, the fixture and the V-shaped steel wire sleeve are removed, the steel wire rope is tightened by adopting a wire tightening double-wheel pulley set, the large yoke plate and the hardware of the sub-conductors are recovered, and the replacement of the large;
10) reinstalling a new small-size side grading ring, recovering the sub-conductor spacer, removing the oxide film of the drainage plate, smearing electric grease, recovering the drainage wire, and fastening one by using a torque wrench;
11) after all the replacement is finished, the temporary anchoring system, the insurance system and the tackle pulley set are dismantled;
12) and after the work is finished, the work grounding wires which are additionally hung before and after the work is dismantled, tools are arranged, and the field is cleaned.
The method can conveniently realize replacement of the strain insulator series-connected plate of the extra-high voltage direct current transmission line on the premise of ensuring safety, and effectively ensure safe and stable operation of the power line.
As a preferable technical means: in the step 4), fastening measures are required to be made for the spacer, and wiring inspection is carried out. Effectively improve the safety and avoid accidents.
As a preferable technical means: the temporary anchoring system is formed by connecting a 100kN aluminum alloy gourd, a GJ-238 x 25m rubber-coated rope, a DG10 shackle and a wire clamping device. The strength requirement of the temporary anchoring system can be realized, the safety is good, and the operation is convenient.
As a preferable technical means: the wire DB adjusting plate is formed by connecting a 100kN aluminum alloy gourd, a GJ-238 m rubber-coated rope and a DG10 in a shackle manner. The strength requirement of the wire DB adjusting plate can be met, the safety is good, and the operation is convenient.
As a preferable technical means: in the step 8), the anchoring rope is provided with an anti-slip structure, the winching and tightening adopt manpower, and the tail rope is pulled and ground for at least 2 persons. Can effectively prevent the reverse slip of anchor rope when the operation, promote the security.
As a preferable technical means: the V-shaped steel wire sleeve is formed by connecting phi 15 steel wire sleeves with 2, 30kN aluminum alloy calabash and DG4 in a shackle manner. The strength requirement of the V-shaped steel wire sleeve can be realized, the safety is good, and the operation is convenient.
As a preferable technical means: and step 10), before the torque wrench is fastened, the bolt penetration direction needs to be determined to be consistent with the original hardware fitting bolt penetration direction. The consistency of standardized operation specifications is ensured, the convenience of operation is realized, and the operation risk is reduced.
Has the advantages that: the method can conveniently realize replacement of the tension insulator series-connected plate of the extra-high voltage direct current transmission line on the premise of ensuring safety, effectively ensure safe and stable operation of the power line and ensure safe and convenient operation.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
FIG. 2 is a schematic view of the step 2 construction layout of the present invention.
In the figure: 1-anchor facing system; 2-an insurance system; 3-cross arm; 4-wire DB adjusting plate; 5, an insulator; 6-a traction plate; 7-a line-tightening double-wheel pulley block; 8-a fixture; 9-V type steel wire sleeve; 10-large yoke plate.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
As shown in fig. 1-2, a method for replacing a large yoke plate of a strain insulator string of an extra-high voltage direct current transmission line comprises the following steps:
1) before construction, cleaning a field around a construction tower, entering construction tools, making construction field fences on the field, obviously placing construction personnel, safety production marks and the like, paving color strip cloth on the field, and placing the construction tools and tools orderly for convenient use;
2) respectively hanging working grounding wires on a front tension tower and a rear tension tower which are adjacent to the construction tower, and using a phi 24 Dyneema rope as a string falling prevention safety rope;
3) arranging anchor piles before winching and entering a field;
4) the method comprises the following steps that (1) operators hang personal security wires, 1 operator goes out wires, 4 spacers on the wires are removed, 6 sub-wires are arranged, the spacers are hung on the 2 sub-wires in the middle respectively, fastening measures are made, wiring inspection is carried out, if special conditions happen, feedback reporting is needed immediately, 1 operator hangs an insulation pulley on a ground wire top frame, and the removed small-size side equalizing ring and drainage spacers are transmitted to the ground through an insulation rope;
5) respectively arranging temporary anchor systems 1 on the 2 sub-leads in the step 4, wherein the temporary anchor systems 1 are formed by connecting 100kN aluminum alloy hoists, GJ-238 m rubber-coated ropes, DG10 shackles and lead wire clamping devices, respectively arranging the temporary anchor systems 1 of the other 4 sub-leads after the system is stressed, tightening all the temporary anchor systems 1, removing drainage wires and binding the drainage wires on the rubber-coated ropes by using ropes;
6) 4 sub-wires in the middle are provided with a safety system 2, one end of the safety system 2 is fixed on the cross arm 3, the other end of the safety system is fixed on a wire DB adjusting plate 4, the wire DB adjusting plate 4 is formed by connecting a 100kN aluminum alloy hoist, GJ-238 m rubber coated ropes and DG10 in a shackle mode, and 2 sub-wires on two sides are provided with phi 24 Dynama ropes which are connected with the cross arm 3 to serve as safety ropes;
7) the four strings of insulators 5 and the metal fittings at the wire ends are reliably fixed by using phi 24 Dyneema ropes every 0.5m on the safety system 2 of the middle 4 sub-wires;
8) the large connecting plate 10 and the sub-conductor are arranged with an 80kN line-tightening double-wheel pulley group 7, the line-tightening double-wheel pulley group 7 walks 4 lines of rope grinding, winching is well placed, reliable anchoring is confirmed, people do not stand in front, the anchoring rope should have anti-skidding measures, the tail rope of the pulling and grinding is not less than 2 people, then the winching is slowly tightened, the connecting hardware fitting of the large connecting plate 10 and the sub-conductor is removed, then the large connecting plate is loosened, the insulator 5 strings are loosened, and the safety rope is stressed; installing two pairs of half-side fixtures 8 at 5-6 porcelain bottles at a lead end, connecting the two pairs of fixtures 8 with a large yoke plate 10 through a V-shaped steel wire sleeve 9, connecting the V-shaped steel wire sleeve 9 by using phi 15 steel wire sleeves star 2, 30kN aluminum alloy hoists and DG4 in a shackle manner, tightening the 30kN hoists, and then removing the connection between the two yoke plates and the large yoke plate 10;
9) a steering pulley is hung on the middle 2 sub-wires in a V shape, a hoisting steel wire sleeve is bound on the large yoke plate 10 by adopting a three-point hoisting method, a tower leg steering pulley, a ground wire top frame pulley and a wire steering pulley are utilized, a hoisting steel wire rope is slowly tightened, the large yoke plate 10 and a wire connecting fitting are dismantled, the steel wire rope is slowly loosened, the dismantled damaged large yoke plate is hoisted, a new large yoke plate 10 is hoisted, after the yoke plate is in place, the connection between the two yoke plates and the large yoke plate 10 is restored by utilizing a fixture 8 and a 30kN hoist, and the fixture 8 and the 30kN hoist are dismantled; the previous 80kN line tightening double-wheel pulley group 7 is adopted to tighten the steel wire rope, the large yoke plate 10 is restored to be connected with the hardware fitting of the sub-conductor, and the large yoke plate 10 is replaced;
10) reinstalling a new small-size side grading ring, recovering the sub-conductor spacer, removing an oxide film of the drainage plate, smearing electric grease, recovering the drainage wire, fastening one by using a torque wrench, and keeping the penetrating direction of the bolt consistent with that of the original hardware bolt;
11) after all the replacement is finished, the temporary anchoring system 1, the insurance system 2 and the tackle pulley set are dismantled;
12) and after the work is finished, the work grounding wires additionally hung before and after the work are detached, tools are arranged, the field is cleaned, personnel are evacuated, and the report is finished.
The method can conveniently realize replacement of the strain insulator 5 series plate of the extra-high voltage direct current transmission line on the premise of ensuring safety, and effectively ensure safe and stable operation of the power line.
The large headers in this example are LT type headers.
The method for replacing the large yoke plate of the strain insulator string of the extra-high voltage direct current transmission line shown in the figures 1-2 is a specific embodiment of the invention, has the outstanding substantive characteristics and obvious progress of the invention, and can modify the strain insulator string equivalently in the aspects of shape, structure and the like according to the practical use requirement and under the teaching of the invention, and the method is in the protection range of the scheme.
Claims (7)
1. A method for replacing a large yoke plate of a strain insulator string of an extra-high voltage direct current transmission line is characterized by comprising the following steps:
1) before construction, site cleaning, construction appliances and safety measures are arranged around a construction tower;
2) respectively hanging working grounding wires on a front tension tower and a rear tension tower which are adjacent to the construction tower, and using a Dyneema rope as a string falling prevention safety rope;
3) arranging anchor piles before winching and entering a field;
4) hanging personal security lines by operators, leading out 1 operator, dismantling 4 spacers on the conductor, and hanging the spacers on 2 sub-conductors in the middle; another 1, hanging an insulation pulley from the ground wire top frame by an operator, and transferring the dismantled small-size side equalizing ring and the drainage spacer to the ground by using an insulation rope;
5) arranging adjacent anchor systems (1) on the middle 2 sub-wires respectively, arranging the adjacent anchor systems (1) on the other sub-wires respectively after the systems are stressed, tightening all the adjacent anchor systems (1), removing the drainage wires, and binding the drainage wires on the rubber-coated rope by using ropes;
6) a safety system (2) is arranged on 4 sub-wires in the middle, one end of the safety system is fixed on the cross arm (3), the other end of the safety system is fixed on the wire DB adjusting plate (4), and 2 sub-wires on two sides are provided with a Dinima rope and connected with the cross arm (3) to be used as a safety rope;
7) the safety system (2) of the middle 4 sub-wires uses a Dyneema rope to reliably fix the four strings of insulator (5) large yoke plates (10) at a distance of 0.4-0.8 m;
8) arranging a wire tightening double-wheel pulley group (7) between a lead and a large yoke plate (10), placing a twisting mill, confirming that anchoring is reliable, slowly tightening the twisting mill, removing connecting fittings of the large yoke plate (10) and six sub-leads one by one to enable insulators (5) to be stringed with the large yoke plate (10) to be loose, stressing safety ropes, installing two pairs of half-side fixtures (8) at 5-6 porcelain bottles at the lead ends, connecting the two pairs of fixtures (8) with the large yoke plate (10) through V-shaped steel wire sleeves (9), tightening the V-shaped steel wire sleeves (9), and removing the connection between the two yoke plates and the large yoke plate (10);
9) the method comprises the following steps that a steering tackle is hung on a V shape on 2 middle sub-wires, a large yoke plate (10) is tied up with a hoisting steel wire sleeve by a three-point hoisting method, a tower leg steering tackle, a ground wire top frame tackle and the steering tackle at the position of the wires are utilized, a hoisting steel wire rope is slowly tightened, the large yoke plate (10) and the wire connecting hardware are removed, the steel wire rope is slowly loosened, the removed damaged large yoke plate is hung down, then a new large yoke plate (10) is hoisted, after the large yoke plate (10) is in place, the connection between the large yoke plate and the large yoke plate (10) is restored by using a fixture (8) and a V-shaped steel wire sleeve (9), the fixture (8) and the V-shaped steel wire sleeve (9) are removed, the steel wire rope is tightened by using a wire tightening double-wheel pulley tackle group (7), the hardware connection between the large yoke plate (10) and the sub-wires is;
10) reinstalling a new small-size side grading ring, recovering the sub-conductor spacer, removing the oxide film of the drainage plate, smearing electric grease, recovering the drainage wire, and fastening one by using a torque wrench;
11) after all the replacement is finished, the temporary anchoring system (1), the insurance system (2) and the tackle pulley set are dismantled;
12) and after the work is finished, the work grounding wires which are additionally hung before and after the work is dismantled, tools are arranged, and the field is cleaned.
2. The method for replacing the large yoke plate of the strain insulator string of the extra-high voltage direct current transmission line according to claim 1, characterized in that: in the step 4), fastening measures are required to be made for the spacer, and wiring inspection is carried out.
3. The method for replacing the large yoke plate of the strain insulator string of the extra-high voltage direct current transmission line according to claim 1, characterized in that: the temporary anchoring system (1) is formed by connecting a 100kN aluminum alloy gourd, a GJ-238 x 25m rubber-coated rope, a DG10 shackle and a wire clamping device.
4. The method for replacing the large yoke plate of the strain insulator string of the extra-high voltage direct current transmission line according to claim 1, characterized in that: the wire DB adjusting plate (4) is formed by connecting 100kN aluminum alloy hoists, GJ-238 m rubber-coated ropes and DG10 in a shackle manner.
5. The method for replacing the large yoke plate of the strain insulator string of the extra-high voltage direct current transmission line according to claim 1, characterized in that: in the step 8), the anchoring rope is provided with an anti-slip structure, the winching and tightening adopt manpower, and the tail rope is pulled and ground for at least 2 persons.
6. The method for replacing the large yoke plate of the strain insulator string of the extra-high voltage direct current transmission line according to claim 1, characterized in that: the V-shaped steel wire sleeve (9) is formed by connecting phi 15 steel wire sleeves with 2, 30kN aluminum alloy calabash and DG4 in a shackle manner.
7. The method for replacing the large yoke plate of the strain insulator string of the extra-high voltage direct current transmission line according to claim 1, characterized in that: and step 10), before the torque wrench is fastened, the bolt penetration direction needs to be determined to be consistent with the original hardware fitting bolt penetration direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911129906.2A CN110854734B (en) | 2019-11-18 | 2019-11-18 | Method for replacing large yoke plate of strain insulator string of extra-high voltage direct current transmission line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911129906.2A CN110854734B (en) | 2019-11-18 | 2019-11-18 | Method for replacing large yoke plate of strain insulator string of extra-high voltage direct current transmission line |
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| CN110854734A CN110854734A (en) | 2020-02-28 |
| CN110854734B true CN110854734B (en) | 2021-02-12 |
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| CN114221256B (en) * | 2021-12-01 | 2023-08-22 | 浙江省送变电工程有限公司 | Method for replacing large connecting plate of extra-high voltage multi-split conductor |
| CN114843939A (en) * | 2022-04-22 | 2022-08-02 | 广东电网能源发展有限公司 | Carbon fiber lead stringing construction method |
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| CN106410662A (en) * | 2016-09-13 | 2017-02-15 | 段宏 | Method for replacing two tension insulator strings of 220KV line in power failure |
| CN107240889B (en) * | 2017-06-29 | 2020-05-22 | 国网福建省电力有限公司 | Method for replacing long-distance multi-bundle conductor |
| CN107171249A (en) * | 2017-06-30 | 2017-09-15 | 国网福建省电力有限公司 | The mounting structure and replacement operation method of a kind of duplex strain insulator string |
| CN108462099B (en) * | 2018-02-27 | 2020-01-24 | 国家电网公司 | Method for replacing double-connection double-hanging-point suspension string insulator of +/-800 kV extra-high voltage line |
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