A method and system for sag-free observation of conductor tight line construction

Abstract

The present application relates to overhead transmission line conductor tension stringing construction technical field, specifically provides a kind of conductor tight line construction method and system of exempting from sag observation, comprising: after paying off, utilize pulley block to be hanged to the stringing of strain insulator and hardware on strain tower cross arm hanging empty, strain insulator string is anchored with conductor by hand winch, temporary anchor rope and wire clamp;Conductor is tensioned, until conductor sag value meets design requirement;Conductor tension anchoring, complete tight line construction procedure.The technical scheme provided by the present application, by adopting accurate mechanical theory and calculation principle, deduce and calculate the conductor (ground wire) sag value that conforms to actual situation, and then carry out tight line construction operation.

Description

Technical Field

[0001] The present invention relates to the technical field of overhead power transmission line conductor tension stringing construction, and in particular to a conductor tensioning construction method and system free of sag observation. Background Art

[0002] Tension payout of overhead transmission lines refers to a method of laying out conductors using construction equipment such as tractors, tensioners, and payout pulleys, allowing them to be elevated above the ground and away from obstacles. This method, along with subsequent operations such as tightening, hanging, and installing accessories, is collectively referred to as tension stringing. Wire tightening is a crucial step in overhead transmission line tension stringing and a crucial component of the tension stringing process.

[0003] After the tensioning is completed, the conductors are deployed on the transmission line towers. Wire tightening is required to ensure that the conductor sag meets the design and operating requirements. Wire tightening should be performed as soon as possible after the tensioning is completed. Wire tightening is usually achieved with the help of a wire tightening operation tower and an anchoring tower in conjunction with a temporary anchor wire. During the specific operation, the temporary anchor wire is fastened to the conductors through a wire clamp, pulley, shackle, and a motorized capstan or a lever hoist to pull the temporary anchor wire, thereby gradually tightening the conductors and ultimately meeting the design sag requirements. The main problems faced by wire tightening in the existing technology are:

[0004] (1) Sag measurement is a manual observation at a specific position under the tower using a theodolite or total station. It requires repeated communication between the line tightening personnel on the tower and the observation personnel under the tower, which makes the line tightening construction cumbersome.

[0005] (2) Since sag needs to be manually observed at a specific location, it is easily blocked by vegetation, obstacles, etc., especially in mountainous areas with complex terrain, where visibility conditions are poor and observation points are difficult to select.

[0006] (3) Manual observation of sag requires good meteorological conditions. Adverse meteorological conditions such as rain and fog will seriously affect the tightening operation. Summary of the Invention

[0007] In order to overcome the above-mentioned defects, the present invention proposes a conductor tightening construction method and system without sag observation.

[0008] In a first aspect, a conductor tightening construction method without sag observation is provided, the conductor tightening construction method without sag observation comprising:

[0009] After the laying of the wire is completed, the pulley group is used to hoist the tension insulator string and the hardware to the cross arm of the tension tower, and the tension insulator string is anchored to the conductor through the hand hoist, temporary anchor rope and wire clamp;

[0010] Tighten the conductor until the conductor sag value meets the design requirements;

[0011] The conductors are tightened and anchored to complete the tightening construction process.

[0012] Preferably, the wire gripper is used to measure the axial tension and spatial tilt angle during the wire tightening process.

[0013] Furthermore, the calculation formula of the conductor sag value is as follows:

[0014]

[0015] In the above formula, y is the conductor sag value, H is the horizontal tension of the overhead line, ω is the weight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point.

[0016] Furthermore, the calculation formula of the conductor sag value is as follows:

[0017]

[0018] In the above formula, y is the conductor sag value, g is the deadweight load ratio of the overhead line, σ is the horizontal stress of the overhead line, ω is the deadweight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point.

[0019] Furthermore, the calculation formula of the horizontal stress of the overhead line is as follows:

[0020]

[0021] In the above formula, H is the horizontal tension of the overhead line, and s is the cross-sectional area of ​​the overhead line.

[0022] Furthermore, the calculation formula for the horizontal tension of the overhead line is as follows:

[0023] H=F×sin(a)

[0024] In the above formula, F is the axial tension during the wire tightening process, and a is the spatial tilt angle during the wire tightening process.

[0025] In a second aspect, a conductor tightening construction system without sag observation is provided, the conductor tightening construction system without sag observation comprising:

[0026] An acquisition module is used to obtain the axial tension and spatial tilt angle of the wire during the wire tightening process collected by the wire clamp;

[0027] A first calculation module is used to calculate the horizontal tension of the overhead line based on the axial tension and the spatial tilt angle during the conductor tightening process;

[0028] The second calculation module is used to calculate the conductor sag value based on the horizontal tension of the overhead line.

[0029] Preferably, the first calculation module is specifically used to:

[0030] H=F×sin(a)

[0031] In the above formula, F is the axial tension during the wire tightening process, and a is the spatial tilt angle during the wire tightening process.

[0032] Furthermore, the second calculation module is specifically configured to:

[0033]

[0034] In the above formula, y is the conductor sag value, H is the horizontal tension of the overhead line, ω is the weight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point.

[0035] Furthermore, the second calculation module is specifically configured to:

[0036]

[0037] In the above formula, y is the conductor sag value, g is the deadweight load ratio of the overhead line, σ is the horizontal stress of the overhead line, ω is the deadweight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point.

[0038] Furthermore, the calculation formula of the horizontal stress of the overhead line is as follows:

[0039]

[0040] In the above formula, H is the horizontal tension of the overhead line, and s is the cross-sectional area of ​​the overhead line.

[0041] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0042] The present invention provides a method and system for conductor tightening construction that does not require sag observation, including: after the wire is laid out, the tension insulator string and hardware are hoisted to the crossarm of the tension tower by using a pulley block, and the tension insulator string is anchored to the conductor by using a hand winch, a temporary anchor rope, and a wire clamp; the conductor is tightened until the conductor sag value meets the design requirements; the conductor is tightened and anchored to complete the tightening construction process. The technical solution provided by the present invention, when used in conjunction with a conductor clamp with a real-time force measurement function and combined with the force analysis of the conductor during the tightening process, can cleverly calculate the horizontal tension of the conductor during the tightening process, and then calculate the conductor sag according to the sag calculation formula. It can be applied to the conductor sag calculation in the tension tightening construction process of overhead transmission lines of various specifications, and has a certain degree of versatility.

[0043] Furthermore, the technical solution provided by the present invention avoids the influence of complex weather conditions on sag observation during the traditional line tightening construction process, thereby reducing the difficulty of the line tightening construction and improving the efficiency of the line tightening construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a flow chart of the main steps of the conductor tightening construction method without sag observation according to an embodiment of the present invention;

[0045] Figure 2 Schematic diagram of the force acting on the connecting rod structure of the conductor clamp in the conductor tightening construction method without sag observation according to an embodiment of the present invention;

[0046] Figure 3 Schematic diagram of the force applied to the conductor portion in the conductor tightening construction method without sag observation according to an embodiment of the present invention;

[0047] Figure 4 Schematic diagram of a rotary force measurement structure in a conductor tightening construction method without sag observation according to an embodiment of the present invention;

[0048] Figure 5 2. Schematic diagram of an application scenario of a conductor tightening construction method without sag observation according to an embodiment of the present invention;

[0049] Figure 6 This is a main structural block diagram of a conductor tightening construction system without sag observation according to an embodiment of the present invention;

[0050] Among them, 1 is the pulley, 2 is the tension insulator string, 3 is the wire rope and tensioning pulley group, 4 is the hand hoist, 5 is the temporary anchor rope, and 6 is the force measuring function wire clamp. DETAILED DESCRIPTION

[0051] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0053] Example 1

[0054] See attached Figure 1 , Figure 1 This is a flow chart of the main steps of a conductor tightening construction method without sag observation according to an embodiment of the present invention. Figure 1 As shown, the conductor tightening construction method without sag observation in the embodiment of the present invention mainly includes the following steps:

[0055] Step S101: After the wire is laid out, the tension insulator string and hardware are hoisted onto the cross arm of the tension tower using a pulley block, and the tension insulator string is anchored to the conductor using a hand hoist, temporary anchor rope, and wire clamp;

[0056] Step S102: tighten the conductor until the conductor sag value meets the design requirements;

[0057] Step S103: tighten and anchor the wires, completing the tightening construction process.

[0058] Wherein, the wire clamp is used to measure the axial tension and spatial tilt angle during the wire tightening process.

[0059] In this embodiment, the horizontal tension of the wire during the tightening process is measured mainly with the help of a wire clamp with a force measuring function. The wireless tension sensor module integrated thereon can measure the axial tension of the wire during the tightening process in real time, and then further calculate the horizontal tension and vertical tension of the wire through the inclination sensor module integrated thereon. Due to the characteristics of the connecting rod structure of the translational wire clamp itself, there is an eccentric distance L between the axial tension of the force measuring pull ring and the axial tension of the wire. When the wire clamp is subjected to force, it will produce a certain tilt. The schematic diagram of its structural force is shown in the figure. Figure 2 As shown; when in a balanced state, the conductor will bend to a certain extent at the connection between the tightening section and the free section. The force diagram of the bent part of the conductor structure is shown in Figure 3 As shown, the axial friction force of the clamped conductor can be decomposed into the axial tension of the anchor wire and the deflection component 1 caused by eccentricity when the balance clamp is initially subjected to force. The axial tension of the conductor can be decomposed into horizontal tension and vertical tension of the conductor.

[0060] The derivation and calculation part based on the measured parameters and force values ​​is mainly based on the theoretical calculation of the conductor sag during the tightening process based on the catenary theory. The parameters of the catenary sag calculation model are as follows: Figure 4 As shown (taking the isolated gear hanging point height as an example). Figure 4 A and B are two suspension points at equal heights, and the arc AOB is the overhead line. Point A is the coordinate origin, fx is the conductor sag, and L is the line distance. The formula for calculating conductor sag using catenary theory is as follows:

[0061]

[0062] In the above formula, y is the conductor sag value, H is the horizontal tension of the overhead line, ω is the weight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point.

[0063] Alternatively, the calculation formula for the conductor sag value is as follows:

[0064]

[0065] In the above formula, y is the conductor sag value, g is the deadweight load ratio of the overhead line, σ is the horizontal stress of the overhead line, ω is the deadweight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point.

[0066] The calculation formula of the horizontal stress of the overhead line is as follows:

[0067]

[0068] In the above formula, H is the horizontal tension of the overhead line, and s is the cross-sectional area of ​​the overhead line.

[0069] Furthermore, the horizontal tension H of the overhead line is the horizontal tension of the conductor in the conductor force diagram, which can be calculated by the tension measured by the tension sensor in the force measuring function wire clamp and the spatial inclination angle. The calculation formula of the horizontal tension of the overhead line is as follows:

[0070] H=F×sin(a)

[0071] In the above formula, F is the axial tension during the wire tightening process, and a is the spatial tilt angle during the wire tightening process.

[0072] In an application scenario, such as Figure 5 As shown, the specific operation steps of the tightening construction of the present invention are as follows:

[0073] (1) After the wire is laid, the tension insulator string and hardware are hoisted to the cross arm of the tension tower using a pulley group. Before tightening the wire, the tension insulator string is anchored to the conductor (ground wire) using a hand hoist, temporary anchor rope and wire clamp;

[0074] (2) Tensioning rough adjustment: This process is mainly completed by the tensioning motorized capstan. The motorized capstan is connected to the guide pulley and the tensioning pulley group, and is connected to the conductor (ground wire) through a conductor clamp with force measurement capability. The conductor (ground wire) is tightened at the operating end. At the same time, the conductor (ground wire) sag value in this process is calculated according to the conductor (ground wire) tensioning construction method without sag observation, omitting the work step of repeatedly observing the sag allowance.

[0075] (3) Fine-tuning of the conductor (ground wire) tensioning. When the calculated conductor (ground wire) sag value is close to the design requirement, the conductor (ground wire) tensioning fine-tuning link is carried out. The tensioning fine-tuning is mainly completed with the help of a lever hoist. The conductor (ground wire) sag value of the process is calculated according to the conductor (ground wire) tensioning construction method without sag observation. When the sag value meets the design requirement, the tensioning is stopped.

[0076] (4) After the conductor (ground) wire is tightened and anchored, after completing the fine adjustment of the tightening, the conductor (ground) wire to be tightened is arranged through the wheel temporary anchor and the reverse temporary anchor to complete the tightening construction process.

[0077] Example 2

[0078] Based on the same inventive concept, the present invention also provides a conductor tightening construction system without sag observation, such as Figure 6 As shown, the sag observation-free conductor tightening construction system includes:

[0079] An acquisition module is used to obtain the axial tension and spatial tilt angle of the wire during the wire tightening process collected by the wire clamp;

[0080] A first calculation module is used to calculate the horizontal tension of the overhead line based on the axial tension and the spatial tilt angle during the conductor tightening process;

[0081] The second calculation module is used to calculate the conductor sag value based on the horizontal tension of the overhead line.

[0082] Preferably, the first calculation module is specifically used to:

[0083] H=F×sin(a)

[0084] In the above formula, F is the axial tension during the wire tightening process, and a is the spatial tilt angle during the wire tightening process.

[0085] Furthermore, the second calculation module is specifically configured to:

[0086]

[0087] In the above formula, y is the conductor sag value, H is the horizontal tension of the overhead line, ω is the weight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point.

[0088] Furthermore, the second calculation module is specifically configured to:

[0089]

[0090] In the above formula, y is the conductor sag value, g is the deadweight load ratio of the overhead line, σ is the horizontal stress of the overhead line, ω is the deadweight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point.

[0091] Furthermore, the calculation formula of the horizontal stress of the overhead line is as follows:

[0092]

[0093] In the above formula, H is the horizontal tension of the overhead line, and s is the cross-sectional area of ​​the overhead line.

[0094] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0095] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0096] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A conductor tightening construction method without sag observation, characterized in that: The method comprises: After the laying of the wire is completed, the pulley group is used to hoist the tension insulator string and the hardware to the cross arm of the tension tower, and the tension insulator string is anchored to the conductor through the hand hoist, temporary anchor rope and wire clamp; Tighten the conductor until the conductor sag value meets the design requirements; The conductor is tightened and anchored to complete the tightening construction process; The wire clamp is used to measure the axial tension and spatial tilt angle during the wire tightening process; The calculation formula of the conductor sag value is as follows: In the above formula, y is the conductor sag value, H is the horizontal tension of the overhead line, ω is the weight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point; Alternatively, the calculation formula for the conductor sag value is as follows: In the above formula, y is the conductor sag value, g is the deadweight load of the overhead line, σ is the horizontal stress of the overhead line, ω is the deadweight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point of the overhead line to the suspension point; The calculation formula of the horizontal stress of the overhead line is as follows: In the above formula, H is the horizontal tension of the overhead line, and s is the cross-sectional area of ​​the overhead line; The calculation formula for the horizontal tension of the overhead line is as follows: H=F×sin(a) In the above formula, F is the axial tension during the wire tightening process, and a is the spatial tilt angle during the wire tightening process.

2. A conductor tightening construction system without sag observation, characterized in that: The system comprises: An acquisition module is used to obtain the axial tension and spatial tilt angle of the wire during the wire tightening process collected by the wire clamp; A first calculation module is used to calculate the horizontal tension of the overhead line based on the axial tension and the spatial tilt angle during the conductor tightening process; A second calculation module is used to calculate the conductor sag value based on the horizontal tension of the overhead line; The wire clamp is used to measure the axial tension and spatial tilt angle during the wire tightening process; The first calculation module is specifically configured to: H=F×sin(a) In the above formula, F is the axial tension during the wire tightening process, and a is the spatial tilt angle during the wire tightening process; The second calculation module is specifically configured to: In the above formula, y is the conductor sag value, H is the horizontal tension of the overhead line, ω is the weight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point on the overhead line to the suspension point; Alternatively, the second calculation module is specifically configured to: In the above formula, y is the conductor sag value, g is the deadweight load of the overhead line, σ is the horizontal stress of the overhead line, ω is the deadweight per unit length of the overhead line, ch is the hyperbolic cosine function, l is the line distance, and x is the horizontal distance from any point of the overhead line to the suspension point; The calculation formula of the horizontal stress of the overhead line is as follows: In the above formula, H is the horizontal tension of the overhead line, and s is the cross-sectional area of ​​the overhead line.

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