RU2276827C1 - Device for protecting conductors of overhead power transmission lines in multiroller suspensions against mechanical wear - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: proposed device that can be used to protect conductors of overhead power transmission lines in multiroller suspensions at crossings through natural obstacle, such as water areas, mountain gorges, and the like, against fatigue wear is set of spirals of standard zinc-plated or aluminum alloy wires; wire spiral layers are different in length, hardness, and direction of coiling; for instance, hardness of internal layer is lower than that of external one but its length is greater than that of the latter by 100 - 1500 mm, and also if internal layer has left-hand direction of coiling, then that of external one is right-hand. Wire hardness of internal layer is higher then or, as a last resort, equal to that of external lay of wires but at the same time it is lower than hardness of external-layer wires of proposed device. This device provides for protecting conductors in multiroller suspensions at crossings of overhead power transmission lines against wear and at the same time it can be used to replace sleeves of multiroller suspensions worn out after long-time service of overhead power transmission line crossings to such extent that damage to aluminum lays of wires takes place.

EFFECT: enlarged functional capabilities of device.

3 cl, 2 dwg

Description

The invention relates to the field of electric power industry, in particular to devices for protection against wear of wires in multi-roller suspensions at transitions of overhead power lines through natural obstacles (water spaces, gorges, etc.).

A device of this purpose is known, for example, a protective protector for hardware loops of descents from flexible busbars of high-voltage substations, designed to prevent fatigue damage to loops as a result of swings and vibrations, made in the form of a set of wire spirals of a given length and pitch [1].

The design of this tread is designed solely to reduce the level of bending stresses resulting from the wind, causing a strong sway of the loops and, as a result, rapid wear of the wire (hollow wires of the type PA). The design of the tread includes tape bandages, locks, screen half-sleeves and other elements and is not intended for installation on a wire in multi-roller suspensions.

A protector for overhead power lines is also known, designed to protect the wire from vibration and vibrations at the points of exit from the connecting clamp, made in the form of a set of wire spirals with a given step length, wound at the installation location of the connecting clamp and adjacent sections of the wire [2] .

This protector has a number of significant drawbacks: it is primarily complex in design, which is a body of revolution with a series of alternating broadening and narrowing of a set of wire spirals, and the spirals are displaced relative to each other and wound with a pass of several turns. The tread design does not allow its use in multi-roller suspensions.

The closest technical solution to the proposed one is a device for protection against wear of wires of overhead power lines in multi-roller suspensions at transitions through natural obstacles, containing a garland of insulators with a multi-roller suspension suspended from it through reinforcement and a means that prevents damage to wires in a multi-roller suspension. The tool that prevents damage to the wires in the multi-roller suspension is made in the form of a guide beam mounted on roller clips in the suspension, with supporting clips attached to it for securing the wires. This design is extremely complex and very time consuming. In addition, when it is used in multi-roller suspensions at the crossings of overhead power lines, there is a danger that under heavy loads (and at the crossings they always arise), the guide beam will not be able to move freely along its roller cages and will work just like a normal blind clamp, deviating under the action of loads together with a supporting garland.

The authors set themselves the specific technical task to develop a device of such a design that would be able to provide reliable protection of the wire against wear in multi-roller suspensions and in areas adjacent to the suspension of the wire of an overhead power transmission line; in this case, the proposed device should surpass the known technical solutions of a similar purpose in its characteristics, which is achieved by a set of essential distinguishing features of the new device, which is fixed in the claims, namely: “a device for protection against wear of wires of overhead power lines in multi-roller suspensions at transitions through natural obstacles containing a garland of insulators with multi-roller suspension suspended to it through reinforcement and means her damaged wires in the multiroll suspension; the tool that prevents damage to the wires in the multi-roller suspension is made in the form of a set of strands of wire spirals of a given pitch and diameter wound on the protected wire at the installation location of the multi-roller suspension and on adjacent sections of the wire, while this set is made multilayer, consisting of at least , of two layers: the inner layer of strands of wire spirals wound on a wire, and the outer layer of strands of wire spirals wound on top of the internal strands, and the direction of winding the wire spi the alley changes from layer to layer in the opposite way so that if the direction of winding the wire spirals of the inner layer of strands is left, then the direction of winding the wire spirals of the next layer of strands is right, etc., and the length of the layers of wire spirals in the strands decreases by 100 ÷ 1500 mm in the direction from the inner layer of the strands to the outer layer; wire spirals in different layers are made of materials of different hardness so that the hardness of the material of the wire spirals of the inner layer is less than the hardness of the material of the wire spirals of the outer layer; the hardness of the wire spirals of the inner layer of strands is greater than or equal to the hardness of the wires of the outer coil of the wire on which the device is installed, but less than the hardness of the wire spirals of the outer layer of strands.

The invention is illustrated by drawings, where figure 1 shows a device made according to the present invention and mounted on a wire in a multi-roll suspension; figure 2 shows the same device on the wire in a schematic enlarged view.

The proposed device for protecting wires 1 is mounted in multi-roller suspensions 2 at the crossings of overhead power lines through water barriers and mountain gorges. Multi-roller suspensions 2 through standard fittings 3 and insulator strings (not shown) are attached to the supports of overhead power lines. The device is equipped with a tool that prevents damage to the wires 1 in multi-roll suspensions 2, which consists of several layers (at least two) of wire strands wound on wire 1; for example, the outer layer 4 and the inner layer 5. The outer layer 4 is shorter than the inner layer 5 by 100 ÷ 1500 mm. As a material for the manufacture of wire spirals, standard galvanized steel wire or aluminum alloy wire is used. In this case, the hardnesses of the wires of the inner and outer layers 4, 5 are different from each other, in particular, the hardness of the wire spirals of the inner layer 5 is less than the hardness of the wire spirals of the outer layer 4. The hardness of the inner layer 5 is chosen to be equal to or slightly higher than the hardness of the wires of the external layer of wire 1, but less hardness of the material of the wire spirals of the outer layer 4. The inner layer 5 is wound directly on the wire 1, and subsequent layers (outer 4, etc.) are wound on the previous layers with the reverse direction of winding about in relative order layer on which the next layer is wound.

The device operates on an overhead power line as follows.

When installing the device, the inner layer 5 of lower hardness is laid on the surface of the wire 1; then, an outer layer 4 of greater hardness, for example, of galvanized steel wire, is mounted on this layer. The use of a multilayer device increases the total diameter of the wire 1 and provides a large contact area of the device with the rollers of the suspension 2. As a result of the crushing forces between the device and the wires of the upper winding of wire 1, they mutually indent, leading to an increase in the contact area. The tests showed that after, for example, 150 cycles of rolling wire 1 with the claimed device along the suspension rollers 2, there were practically no significant changes in the diameter of the device horizontally and vertically, since there was an equilibrium between the cutting force and the total contact area. On the surface of the wires of the device from the side where the wires contacted the rollers, no signs of wear were observed. On the surface of the brooks of the suspension rollers 2, slight traces of indentation from the outer layer 4 of the device with a depth of about 0.2 mm were visible. On the outer surface of the inner layer 5 of the device, practically no traces of the introduction of wires from the outer layer 4 of the device were observed. Additionally, comparative comparative tensile tests of undeformed and artificially deformed wires showed that the depth of indentation of the wires into each other, and in the proposed embodiment this is no more than a few tenths of a millimeter, does not actually affect the amount of destructive force of the wire.

The claimed device provides reliable fixation of wire spirals relative to the wire, resulting in:

- eliminates the possibility of abrasive wear of wire wires;

- there are no local kinks in the wire;

- a long service life of the wire is achieved, since the spiral-type device has a bending stiffness comparable to the bending stiffness of the wire itself and bends around the perimeter of the rollers;

- the conductivity of the wire is completely restored within the multi-roller suspension;

- eliminates the accumulation of moisture between the wire and the device and, accordingly, the risk of corrosion is reduced.

Elektrosetstroyproekt CJSC has launched mass production of devices of the proposed type.

Information sources

1. Patent of the Russian Federation No. 2189682, class H 02 G 7/14 dated November 16, 2000, published September 20, 2002 Bull. No. 26.

2. Patent of the Russian Federation No. 2168825, class H 02 G 7/14 dated December 15, 1999, published on May 10, 2001, Bull. No. 13.

3. Patent of the Russian Federation No. 2040094, class H 02 G 7/05 of 03/23/1993, published on 07/20/1995, Bull. No. 20.

Claims (3)

1. Device for protecting against wear of wires of overhead power lines in multi-roller suspensions at crossings over natural obstacles, comprising a garland of insulators with multi-roller suspension suspended from it through reinforcement and a means for preventing damage to wires in a multi-roller suspension, characterized in that the means for preventing damage to wires in multi-roll suspension, made in the form of a set of strands of wire spirals of a given step and diameter, wound on a protected wire at the installation site of an oval suspension and on adjacent sections of wire, wherein said set is multilayer, consisting of at least two layers: an inner layer of strands of wire spirals wound on a wire, and an outer layer of strands of wire spirals wound on top of internal strands, the direction of winding the wire spirals changes from layer to layer in the opposite way, so that if the direction of winding the wire spirals of the inner layer of strands is left, then the direction of winding the wire spirals of the next layer of strands right, etc., and the length of the layers of wire spirals in the strands decreases by 100 ÷ 1500 mm in the direction from the inner layer of the strands to the outer layer. 2. The device according to claim 1, characterized in that the wire spirals in different layers are made of materials of different hardness so that the hardness of the material of the wire spirals of the inner layer is less than the hardness of the material of the wire spirals of the outer layer. 3. The device according to claim 1, characterized in that the hardness of the wire spirals of the inner layer of strands is greater than or equal to the hardness of the wires of the outer coil of the wire on which the device is installed, but less than the hardness of the wire spirals of the outer layer of strands.

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