CN110994461A - Method for preventing ice coating of power transmission line by improving paying-off tension and inhibiting torsion of lead - Google Patents
Method for preventing ice coating of power transmission line by improving paying-off tension and inhibiting torsion of lead Download PDFInfo
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- CN110994461A CN110994461A CN201911410474.2A CN201911410474A CN110994461A CN 110994461 A CN110994461 A CN 110994461A CN 201911410474 A CN201911410474 A CN 201911410474A CN 110994461 A CN110994461 A CN 110994461A
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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 preventing ice coating of a power transmission line by improving paying-off tension and inhibiting wire torsion, which comprises the following steps: s1, simulating the icing state of the power transmission line under different paying-off tensions, calculating the paying-off tension of the power transmission line with the minimum icing weight, and taking the paying-off tension as the predicted paying-off tension for inhibiting the torsion of a lead; s2, performing an ice coating experiment on the power transmission line under different paying-off tensions in the step S1, measuring the actual ice coating weight of the power transmission line, and screening out the paying-off tension of the power transmission line with the minimum actual ice coating weight as the actual measurement paying-off tension; and S3, performing difference value operation on the predicted pay-off tension and the actually measured pay-off tension, comparing the difference value with a set threshold value, and if the difference value is smaller than the set threshold value, taking the predicted pay-off tension as the pay-off tension for inhibiting the torsion of the power transmission line and arranging the power transmission line according to the pay-off tension.
Description
Technical Field
The invention relates to a method for preventing ice coating of a power transmission line, in particular to a method for preventing ice coating of a power transmission line, which improves paying-off tension and inhibits wire torsion.
Background
The ice coating of the transmission line seriously harms the safe operation of the power grid. The ice coating of the transmission conductor is a gradual change process, in the ice coating process, an ice layer grows on the windward side firstly, if the wind direction does not change rapidly, the ice coating thickness on the windward side is gradually increased, and when the ice coating on the windward side reaches a certain thickness, the ice coating weight of the conductor is enough to enable the conductor to be twisted, the conductor can be twisted; during the continuous ice coating process, the ice coating on the surface of the wire can continuously grow, and finally, circular or elliptical ice coating is formed on the wire. Generally, the ice coating of the small diameter wire is round, and the wire with the large diameter is oval. The ice coating of the transmission conductor exceeds the weight which can be borne by the conductor, so that the tower collapses, the ice coating of the transmission line seriously harms the safe operation of the power grid, and when the ice coating thickness exceeds a critical value, the tower collapses, the transmission line stops operating, thereby bringing great inconvenience to the production and the life of people while causing great economic loss.
Therefore, a new technical solution is needed.
Disclosure of Invention
In view of the above, the method for preventing the ice coating of the power transmission line by improving the paying-off tension and inhibiting the twisting of the lead provided by the invention can prevent the power transmission line from twisting in the ice coating process, so that the power transmission line forms unilateral non-uniform ice coating, and the ice coating falls off under the action of natural wind force, thereby effectively preventing the tower of the power transmission line from collapsing due to excessive ice coating on the power transmission line, ensuring the stable operation of the whole power grid system, and avoiding the production and life loss caused by the ice coating of the power transmission line to the society.
The invention provides a method for preventing ice coating of a power transmission line by improving paying-off tension and inhibiting wire torsion, which comprises the following steps:
s1, simulating the icing state of the power transmission line under different paying-off tensions, calculating the paying-off tension of the power transmission line with the minimum icing weight, and taking the paying-off tension as the predicted paying-off tension for inhibiting the torsion of a lead;
s2, performing an ice coating experiment on the power transmission line under different paying-off tensions in the step S1, measuring the actual ice coating weight of the power transmission line, and screening out the paying-off tension of the power transmission line with the minimum actual ice coating weight as the actual measurement paying-off tension;
and S3, performing difference value operation on the predicted paying-off tension and the actually measured paying-off tension, comparing the difference value with a set threshold value, and if the difference value is smaller than the set threshold value, taking the predicted paying-off tension as the paying-off tension for restraining the torsion of the power transmission line and arranging the power transmission line according to the paying-off tension.
Further, the method also includes step S4: when the power transmission line is arranged, the hydrophobic material is coated on the power transmission line.
Further, in step S1, in the simulation calculation, the wire of the power transmission line is set to have a diameter of 3mm and a length of 4.8m, and the wire is a steel wire.
Further, in step S1, the different tension includes 6N/mm2、8N/mm2、10N/mm2And 12N/mm2、14N/mm2。
Further, in step S2, in the ice coating experiment, when the pay-off tension is applied to the power transmission line, the set pay-off tension is applied in a manner of decreasing to increasing.
The invention has the beneficial effects that: according to the invention, the transmission line can not twist in the icing process, so that the transmission line forms unilateral non-uniform icing, and the icing falls off under the action of natural wind force, thereby effectively preventing the tower of the transmission line from collapsing due to excessive icing on the transmission line, ensuring the stable operation of the whole power grid system, and avoiding the production and life loss caused by the icing of the transmission line to the society.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic diagram of the force applied to the power transmission line before twisting due to ice coating.
Fig. 3 is a schematic view of the torsion stress of the power transmission conductor of the present invention when the power transmission conductor is completely coated with ice.
FIG. 4 is a schematic view of crescent-shaped ice coating according to the present invention.
Fig. 5 is a diagram of the relationship between the tower distance and the torsion angle of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings, in which:
the invention provides a method for preventing ice coating of a power transmission line by improving paying-off tension and inhibiting wire torsion, which comprises the following steps:
s1, simulating the icing state of the power transmission line under different paying-off tensions, calculating the paying-off tension of the power transmission line with the minimum icing weight, and taking the paying-off tension as the predicted paying-off tension for inhibiting the torsion of a lead; the method comprises the following steps that simulation of the icing state of the power transmission line is achieved through existing simulation software;
s2, performing an ice coating experiment on the power transmission line under different paying-off tensions in the step S1, measuring the actual ice coating weight of the power transmission line, and screening out the paying-off tension of the power transmission line with the minimum actual ice coating weight as the actual measurement paying-off tension;
and S3, performing difference value operation on the predicted pay-off tension and the actually-measured pay-off tension, comparing the difference value with a set threshold value, and if the difference value is smaller than the set threshold value, taking the predicted pay-off tension as the pay-off tension for inhibiting the torsion of the power transmission line and arranging the power transmission line according to the pay-off tension.
In this embodiment, the method further includes step S4: when the power transmission line is arranged, the hydrophobic material is coated on the power transmission line, and by the method, the moisture in the air can be effectively reduced from adhering to the power transmission line, so that the ice coating is reduced.
In this embodiment, in step S1, during the simulation calculation, the wire of the power transmission line is set to have a diameter of 3mm and a length of 4.8m, and the wire is a steel wire.
In step S1, the different tensions include 6N/mm2、8N/mm2、10N/mm2And 12N/mm2、14N/mm2. Wherein, the transmission conductor adopts a steel wire simulation conductor with the diameter of 3mm and the length of 4.8m, and the set five groups of paying-off tension values are respectively 6N/mm2、8N/mm2、10N/mm2、12N/mm2、14N/mm2According to the paying-off tension of the wire and the cross-sectional area of the wireThe relationship calculates the amount of tension at the two ends of the wire as follows:
TABLE 1 relationship between the paying-off tension and the tension of the conducting wire
| Group of | Magnitude of pulling force (N) | Paying-off tension (N/mm2) |
| 1 | 169.641 | 6 |
| 2 | 226.188 | 8 |
| 3 | 282.735 | 10 |
| 4 | 339.282 | 12 |
| 5 | 395.829 | 14 |
In this embodiment, in step S2, during the ice coating experiment, when the pay-off tension is applied to the power transmission line, the set pay-off tension is applied in a small-to-large manner, and in the manner, the characteristics of ice coating growth under different tensions can be known, which is beneficial to determining the pay-off tension.
In the process of wire icing, an ice layer grows on the windward side at first, and if the wind direction does not change rapidly, the thickness of ice coating on the windward side can be increased continuously. When the ice on the windward side reaches a certain thickness and the weight of the ice is enough to enable the wire to be twisted, the wire can be twisted; the ice coating on the surface of the lead can grow continuously due to the continuous twisting of the lead, and finally, the round or elliptical ice coating is formed on the lead. Generally, small diameter wires are round coated with ice, while large diameter wires are oval.
Based on the mechanism of ice coating formation of the power transmission line conductor, a method of improving the paying-off tension of the conductor and coating hydrophobic coating is provided, the conductor is prevented from being twisted to form cylindrical or elliptical ice coating in the ice coating growth process, ice coating formed on a rigid conductor is unilaterally non-uniform ice coating, and the bonding force of an ice coating layer is small under the action of the coating on the surface of the conductor, so that wing-shaped ice coating of the power transmission line conductor naturally falls off, and the purpose of preventing the power transmission line conductor from ice coating and snow accumulation disasters is achieved.
When the lead is eccentrically coated with ice, the lead is mainly acted by ice layer moment and anti-twisting moment and is a schematic diagram of the eccentric coated ice lead twisting. When M is1Greater than M2When the wire is twisted, the eccentric ice-coated wire is twisted. The incoming flow direction is basically unchanged, and uniform cylindrical ice coating is formed on the surface of the lead. When M is1Less than M2In time, the ice coating torque cannot make the ice coated conductor twist, and extremely uneven crescent or airfoil ice coating is formed on the surface. When M is1And M2When the actions of (1) are equal, the state is stable.
The torsional rigidity of a single conductor per unit length is the characteristic of the conductor and is only related to the material, the geometric characteristic and the structural parameter of the conductor. Can be expressed as:
K＝GJ (1)
wherein K is the torsional rigidity of the single conductor per unit length, and G is the torsional elastic modulus; j is the torsional polar moment of inertia.
Crescent-shaped icing is a typical ice-coating shape, as shown in fig. 3. The equivalent ice layer moment caused by the eccentric icing per unit length can be expressed as:
wherein M represents the weight of ice coating per unit length of wire, ρ0Is the standard ice coating density of 0.9g/cm3(ii) a b is the thickness of the ice coating; g is the acceleration of gravity; r is the radius of the eccentric ice coating.
The ice coating thickness was the same for all lines, assuming uniform ice coating over the entire length of the line. Taking the tower as a zero point and the pitch direction as an x axis, the torsion angle of the x position of the coordinate is
Wherein, thetaxIs the torsion angle of x from the tower, MxThe unit conductor icing mass at x and the conductor span l.
As can be seen from the formula (3): when the ice coating of the wires in the same span is uniform, the twisting angle of the ice layer is different along with the different positions of the towers. From fig. 5, it can be known that the farther away from the tower, the larger the twisting angle of the ice layer, but gradually approaches to saturation, and the maximum twisting angle value exists in the middle of the span; furthermore, the twist angle of the power conductor gradually increases as the thickness of the ice coating increases.
In this example, the temperature in the climatic laboratory was-2 ℃ to 0 ℃. The steel wire rope tensioner is used for adjusting the tension of a steel wire to a preset value, a manual icing experiment is carried out in a manual climate laboratory, the thickness of the steel wire icing is measured by a vernier caliper every 1h, and the obtained experimental data are as follows:
TABLE 2 Ice coating data per hour for five groups of power transmission conductors
| Time of day | Group 1 | Group 2 | |
Group 4 | Group 5 |
| 1h | 11.3/7.4 | 11.8/7.3 | 11.0/7.5 | 11.5/7.2 | 11.2/7.3 |
| 2h | 17.2/12.8 | 18.2/11.8 | 16.8/11.1 | 18.0/11.6 | 17.8/11.3 |
| 3h | 22.7/18.7 | 22.8/17.7 | 22.3/16.8 | 24.4/14.8 | 23.8/15.2 |
| 4h | 25.9/25.5 | 26.7/24.5 | 27.3/19.6 | 29.9/17.5 | 30.3/16.8 |
| 5h | 30.4/29.8 | 31.4/29.2 | 32.7/22.3 | 38.9/20.9 | 39.0/21.4 |
| 6h | 34.1/32.8 | 34.5/33.0 | 37.4/27.9 | 43.3/23.5 | 42.9/24.2 |
| 7h | 37.4/36.6 | 37.8/35.6 | 39.5/30.1 | 47.4/27.3 | 48.8/26.3 |
After 7 hours, the experiment was completed and groups 1 and 2 were iced in oval or round form and groups 3, 4, 5 were iced in airfoil form. Take off the icing on the steel wire, weigh the icing of iron wire with the weigher, reachd following data:
TABLE 3 icing data of five groups of power transmission conductors after 7 hours
| Group of | Group 1 | Group 2 | |
Group 4 | Group 5 |
| Ice weight kg/m | 0.934 | 0.916 | 0.824 | 0.635 | 0.612 |
The paying-off tension values of the transmission conductors of the groups 1 and 2 are small, and the transmission conductors are continuously twisted in the ice coating process to finally form round or elliptical uniform ice coating. The paying-off tension of the transmission conductors of the groups 3, 4 and 5 is large, and the conductors are not twisted in the ice coating process, so that unilateral non-uniform ice coating is formed.
The experimental result shows that the paying-off tension of the lead is small, and the lead is twisted in the ice coating process to form cylindrical ice or elliptic ice. The larger the paying-off tension of the lead is, the more difficult the lead is to twist, and finally the wing-shaped ice with uneven single side is formed. The paying-off tension of the lead is improved from 6N/mm2To 8N/mm2To 10N/mm2To 12N/mm2To 14N/mm2The ice coating amount of the lead per unit length is respectively reduced by 19.2%, 10.04%, 22.94% and 3.31%.
The wire is paid off from 10N/mm2Increased to 12N/mm2The ice coating amount of the lead can be obviously reduced.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. A method for preventing ice coating of a power transmission line by improving paying-off tension and inhibiting torsion of a lead is characterized by comprising the following steps: the method comprises the following steps:
s1, simulating the icing state of the power transmission line under different paying-off tensions, calculating the paying-off tension of the power transmission line with the minimum icing weight, and taking the paying-off tension as the predicted paying-off tension for inhibiting the torsion of a lead;
s2, performing an ice coating experiment on the power transmission line under different paying-off tensions in the step S1, measuring the actual ice coating weight of the power transmission line, and screening out the paying-off tension of the power transmission line with the minimum actual ice coating weight as the actual measurement paying-off tension;
and S3, performing difference value operation on the predicted paying-off tension and the actually measured paying-off tension, comparing the difference value with a set threshold value, and if the difference value is smaller than the set threshold value, taking the predicted paying-off tension as the paying-off tension for restraining the torsion of the power transmission line and arranging the power transmission line according to the paying-off tension.
2. The method for preventing the icing of the power transmission line by improving the paying-off tension and inhibiting the twisting of the lead according to claim 1 is characterized in that: further comprising step S4: when the power transmission line is arranged, the hydrophobic material is coated on the power transmission line.
3. The method for preventing the icing of the power transmission line by improving the paying-off tension and inhibiting the twisting of the lead according to claim 1 is characterized in that: in step S1, during the simulation calculation, the wire of the power transmission line is set to have a diameter of 3mm and a length of 4.8m, and the wire is a steel wire.
4. The method for preventing the icing of the power transmission line by improving the paying-off tension and inhibiting the twisting of the lead according to claim 1 is characterized in that: in step S1, the different tensions include 6N/mm2、8N/mm2、10N/mm2And 12N/mm2、14N/mm2。
5. The method for preventing the icing of the power transmission line by improving the paying-off tension and inhibiting the twisting of the lead according to claim 1 is characterized in that: in step S2, during the ice coating experiment, when the paying-off tension is applied to the power transmission line, the set paying-off tension is applied in a small-to-large manner.
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Citations (4)
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| CN102507123A (en) * | 2011-09-29 | 2012-06-20 | 中国电力科学研究院 | Test method used for transmission line ice coating disconnection |
| CN109374277A (en) * | 2018-11-22 | 2019-02-22 | 华北电力科学研究院有限责任公司 | The equivalent test device of conducting wire bias icing |
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- 2019-12-31 CN CN201911410474.2A patent/CN110994461B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008133716A1 (en) * | 2007-04-26 | 2008-11-06 | Singer Howard M | Methods, media, and devices for providing a package of assets |
| CN201191745Y (en) * | 2008-04-18 | 2009-02-04 | 上海电力线路器材有限公司 | Anti-bouncing rotary cable clip apparatus |
| CN102507123A (en) * | 2011-09-29 | 2012-06-20 | 中国电力科学研究院 | Test method used for transmission line ice coating disconnection |
| CN109374277A (en) * | 2018-11-22 | 2019-02-22 | 华北电力科学研究院有限责任公司 | The equivalent test device of conducting wire bias icing |
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