In the past construction of transmission lines with 66 kV and above transmission lines, individual conductors often encountered wear due to various causes during construction, and they need to be handled, causing inconvenience for construction. Based on the previous experiences in the construction of transmission lines, this paper summarizes the research and methods used in the anti-grinding measures for the construction of conductors.
The problem of wear on the conductors of transmission lines has often occurred in the line of more than 66 kV in the past. This problem is a key item in the acceptance inspection of the construction quality of the line and will affect the future operation of the line. Therefore, how to effectively avoid wire wear during the construction of transmission lines and ensure the quality of the wires is a subject that needs urgent research and solution. This article through the previous construction experience, the wire is prone to wear and anti-wear measures to make a summary.
1 Wire wear during handling and transportation
The wear and tear of the wire during loading and unloading and transportation are as follows:
1.1 The deformation of the wire spool, the loss of the spool plate, and the protection of the spool outside.
Take measures: appearance inspection before loading and unloading and transportation.
1.2 The spool rolls, flips, and collides with the surroundings in the transport vehicle.
Take measures: Add anchorage measures such as bedding under the bobbin during the transportation process to ensure that the bobbins cannot roll and flip freely, and ensure that the bobbins should stand upright and cannot be placed horizontally.
1.3 The method of hoisting wires during loading and unloading is improper.
Take measures: Lift the wire spools with a crane, lightly put them gently, and do not collide, and the length of the slings should be appropriate so that the axles are not deformed by the slings. Pay attention to whether the side plate of the spool is damaged and deal with it in time to prevent the wire from being damaged.
2 Wire wear during wire laying
The wire is prone to wear and tear in the process of tension release:
2.1 Wire and bobbin friction.
Take measures: During the line-out process, send special personnel to take care of the reels at any time, and find that there are friction conditions at any time to stop changing the direction of the reel or take measures such as soft pad lifting.
2.2 When the wire is changed to a shaft, the snake skin and the wire contact damage.
Take measures: Check the quality of snakeskin holsters before use to see if there are any hard objects that can easily scratch the wires and handle them gently.
2.3 In the process of putting the wire off, it is frictional with the crossover in the payoff gear.
Take measures: Before the tension release line construction, we must calculate the tension of the tensioning line to ensure that the distance between the crossover and the spanning frame can not be ensured in the case of friction calculation, such as: lifting the lower wire and other measures.
2.4 Conductor friction with traction ropes and guide ropes.
Take measures: Spread the wires, guiding ropes, and traction ropes to avoid friction, and arrange the order of exhibition. It is determined that the conductors are not exposed to the guide lanyards and the traction ropes, and the designated person will monitor the unloading process at each tower during the unloading process.
2.5 Traction board overturned, etc. Over-tension tower conductor wear.
Take measures: The height difference between the two sides of the tension tower is larger, and the double pulley should not be equally high. In order to ensure that the floats are always subjected to force, attention should be paid to their intention, positioning and the length of the steel cable sheaths, and the calculations should be carried out after calculation based on the height difference, span, tension and rotation angle. If the tension tower rises, one or two tackles may be hung upside down depending on the size of the corner. Put and tight line construction to adjust the tension of the wire to prevent impact, and strictly monitor the status of each file during the line-out process. Found money to check in detail the quality of the rotating connector, turning flexibility.
2.6 Lifting operation, the traction rope and the wire friction, the wire grinding, release the pressure wire rope, the wire in the trough when the wire jumped trough and other processes to wear the wire.
Take measures: The airlift should lift the remote wire first and lift it in order according to the position of the wire after being lifted off to prevent the poor collision between the pulling rope or the wire. Released to Xi'an press rope application soft rope and prevent the wire and pressure rope rubbing each other. When pressing before airlift, it should be cross-crossed to the ground according to the steps along the line, to minimize the length of the wire after-bearing line, so that the wire after the liftoff to maintain the safety of the ground Clearance distance.
2.7 The ground wire between the wire and the equipment and parts are worn.
Take measures: Use anti-grinding measures between the wires and tools, such as the anchor wire steel anchor, the anchor anchor steel wire rope, and the wire threader in the process of anchoring line.
2.8 Contact with the ground wear.
Measures shall be taken: Before the wire is laid on the ground, protection facilities such as color strip cloth, straw mat, and tarpaulin shall be laid on the ground. The protection wire shall not be in direct contact with the ground, and shall be provided with a bracket to allow it to leave the ground and be protected by special personnel.
3 Accessories Wire wear during installation
3.1 Wire lifting tools and wire wear.
Take measures: Use lifting ropes and hooks that have been glued, and the contact length between the hooks and the wires is greater than 50mm.
3.2 The conductor wears during installation of the spacer. During the installation of the spacer rod, the speed of the coaster should not be too fast. The speed should be steady and uniform. The speed of the brake should be used during the downhill course of the coaster. When overhanging the vertical line clamps, the two operators operate and pre-install the wire at the entrance and exit of the valve. Line hose.
Wire wear protection measures are a long-term research project developed with new technologies and new applications. With the current environment of excessive energy consumption and strained resources, our power transmission and transformation projects should adapt to the environment. Under the premise of understanding new science and new technologies, we must improve wire wear prevention measures to ensure construction quality and save resources.