SU974483A1 - Device for tensioning wires of overhead power transmission line - Google Patents

Description

The invention relates to power engineering, in particular, to devices for tensioning wires of an overhead transmission line.

A device for tensioning the wires of an overhead transmission line is known, which contains a compensator made in the form of a spring and fixed between a support and a shaft of isolators 1.

The disadvantage of this device is that it uses a mechanical spring as a compensator, the characteristics of which change over time, and therefore requires periodic calibration. In addition, spring compensators are unreliable in operation and complex in design.

The closest in technical essence and the achieved result to the invention is a device for tensioning wires of an overhead transmission line, containing a compensator fixed between the support and the arm of insulators 2.

However, this device for tensioning wires can be used only on the extreme supports of the power line, as flexible

The plugs hinder the laying of loops into the next span, and the construction of loops of a special construction leads to an increase in the cost and complexity of the structure.

The aim of the invention is to reduce the cost and simplify the design.

The goal is achieved

10 in that in a device for tensioning wires of an overhead transmission line containing a compensator fixed between a support and a wire of insulators, the compensator is made in the form of sealed bellows filled with inert gas and installed inside the case between the flanges of movable rods, shells

20, there are coupling nuts, and in its side surfaces there are made longitudinal slits, in which guide screws, which are included in

25 flanges movable rods.

The drawing shows a device for tensioning wires, a general view.

The device comprises a housing 1 with longitudinal slits 2, in which

Claims (2)

0 the guide screws 3 are moved, screwed into the flanges 4 of the rods 5, the cap nuts are screwed onto the body 1, and between them and the flanges 5 of the rods 5 there are compensators in the form of bellows boxes 7, each of which consists of two silos of backgrounds 8 and 9 s lids 10. The internal cavity of the bellows boxes 7 is filled with an inert gas, such as nitrogen. The rods 5. also contain two threaded rods 11 with 12 lugs, locked with nuts 13 and secured with a nut 14, the device is fastened to one of the rods with a special structure, and the other to a power supply insulator, this does not cause any prep for the passage of the plume into the adjacent span. The device works as follows. In the installation mode, the wire is tightened in flight for a certain (calculated) pull. At the same time, the bellows boxes 7 are compressed to the calculated sizes, and v. 3 occupy a middle position in the longitudinal slots x 2 of the housing 1. Moreover, the tension in the span (T) is balanced by the force F determined by the pressure in the bellows box. As the ambient temperature rises, the wire in the span lengthens (sags), the tension in the span decreases and becomes equal to T T. At the same time, the gas temperature in bellows boxes increases, the force F increases, and f f F becomes. Thus, when the temperature rises, the balance of forces F and T is disturbed. (F becomes more T). This difference of forces leads to the fact that the bellows begin to open, moving the rods 5 moving inside the device. In the process of decompression of the bellows, the device is shortened by moving the movable rods, the wire stretches in tension, T pulls up, returning to the calculated pull T. At the same time, the volume occupied by the gas in the bellows increases, F decreases, returning to the value F, corresponding to the corresponding installation mode. Thus, the equality of forces F and T occurs again, but already at the new position of the moving rods 5 (the rod is retracted inwards. When the ambient temperature decreases), the wire shortens in the span (). At the same time, the temperature of the gas in the bellows decreases. F decreases (F, F). Thus, as the temperature decreases, the equilibrium of forces in the device also disrupts, but in the opposite direction (Tj becomes greater than Tj). This difference of forces leads to compression of the bellows boxes and moving rods 5 move out of the device the length of the device elongation of the device leads to a weakening of the wire, tension .Tf decreases, returning to the calculated tension T. When compressing the bellows F, 2 increases, returning to the value F, corresponding to the installation mode. however, the rods are pulled out at the same time. Thus, the wire tension in the span is constant, not dependent on the ambient temperature. The device can be made of various sizes (for different values of calculated gravity T) and different operating conditions With climatic regions). No gas is required when installing and operating the device (gas is pumped into the bellows under factory conditions). If the bellows is damaged, it is replaced or the entire tensioner is replaced. The device replacement technology is similar to the technology of replacing insulators in a tension cable and presents no difficulties. The invention The device for tensioning the wires of an electrical overhead line contains a compensator fixed between the support and a wire of insulators, characterized in that, in order to reduce the cost and simplify the design, the compensator is made in the form of sealed strong boxes filled with an inert gas and installed inside the case flanges of movable rods, with cap nuts on the end ends of the body, and in its side surfaces longitudinal cuts are made, in which they are fixed These are the guide screws included in the flanges of the movable rods. Sources of information taken into account in the examination 1. US patent number 2121478, cl. 174-40, 1938. 2. USSR author's certificate number 454627, cl. H 02 G 7/02, 1973.