WO2020171743A1

WO2020171743A1 - Clamp for repairing overhead transmission line conductors and method for the installation thereof

Info

Publication number: WO2020171743A1
Application number: PCT/RU2020/050023
Authority: WO
Inventors: Арнольд Георгиевич ШАСТИН; Дмитрий Дмитриевич КАПЛИН; Арсен Рудольфович БАБАЯН
Original assignee: Общество С Ограниченной Ответственностью "Лаборатория Будущего" (Ооо "Лаборатория Будущего")
Priority date: 2019-02-20
Filing date: 2020-02-19
Publication date: 2020-08-27
Also published as: RU2717105C1

Abstract

A clamp for repairing overhead transmission line conductors comprises a saddle consisting of a U-shaped profile, and a casing. The length of the saddle is greater than the length of the casing. The casing is in the form of a hollow cylinder, a portion of which is removed in a segment corresponding to the diameter of a conductor. The saddle is inserted movably into the casing. The conductor is in contact with the internal surface of the saddle and with the internal surface of the casing. For this purpose, the centre of the circle of the base of the U is at a distance Δ from the centre of the external surface thereof, wherein Δ=(D-d)⁄2, where D is the external diameter of the U and d is the diameter of the conductor. Flattened surfaces for holding the saddle are formed on the portion of the saddle that protrudes beyond the casing. Transverse grooves are formed on the internal surface of the saddle. The conductor is enclosed in the clamp by rotation of the casing, and fixed in the clamp by pressing and/or by application of current-conducting, adhesively bonding or curable substances.

Description

CLAMP FOR REPAIR OF WIRES OF AIR POWER LINES AND METHOD OF ITS INSTALLATION

The group of inventions relates to the field of electric power engineering, namely to linear clamps intended for repair, in particular, steel-aluminum, aluminum or copper bare wires of overhead power lines (hereinafter referred to as overhead power lines), having damaged cores and mounted, in particular, by crimping (pressing). Technical solutions allow for both emergency repairs and routine maintenance of power lines.

During the operation of the overhead transmission line, various types of wire damage are noted, in particular, the unbraiding of the wire cores, damage to its surface under the influence of vibration vibrations, external forces, etc. Such damage can lead to both an increase in the resistance of the wire and a decrease in the efficiency of power transmission, as well as to the occurrence of serious emergencies. The claimed clamp and the method of its installation make it possible to eliminate the defects of the overhead transmission line, which in the future could provoke serious damage and emergency situations.

Currently, the repair of damaged or completely destroyed sections of overhead power transmission lines is carried out by installing special connecting clamps in the appropriate places, which fix the wire, preventing its further unraveling and / or damage with the restoration of the electrical conductivity of the section. Their use makes it possible to compensate for the increase in resistance that occurs when the wire cores are damaged.

A number of solutions are known from the prior art, using two halves of the pipe, intended for repairing damage, with their compression with a special tool. The connection of the half-pipes occurs due to the connection elements of the “thorn-groove” type of various shapes made on their contact surfaces.

For example, a pipe for repairing a power line is known [CN206992615U, prior. 05/12/2017, publ. 02/09/2018, H02G1 / 14, H02G1 / 16], each of the half-pipes of which contains a groove on one side and a tenon on the other, corresponding to each other.

Also known is the repair pipe for the power line [CN202121260U, prior. from 16.06.2011, publ. 01/18/2012, H01R4 / 20, H02G1 / 14, H02G7 / 00], the half-pipes of which are completely identical and contain at each end a groove and a tenon at the same time, such that the grooves of one pipe correspond to the tenon of the other.

Known repair clamp [RU2285991, prior. from 27.05.2005, publ. 20.10.2006, IPC (2006.01) H02G 7/08, H01R 4/20] in the form of two identical half-pipes from a special groove-shaped profile, on each of which there is a groove on one side, and on the other - a corresponding protrusion, which can be made different shapes from polyhedron to oval. During assembly, one of the half-pipes is installed on the overhead power line wire, and the second slides from above, while the protrusions enter their grooves and the clamp is assembled, forming a pipe, in the inner cavity of which the wire is located. Then press with hexagonal dies.

The known devices require, in order to ensure the connection provided for by their design, rather high accuracy when the half-pipes are positioned relative to each other during installation, which can be difficult when working at height.

Technical task and technical result

The technical problem to be solved by the group of inventions is the creation of a simple, constructive, in use and manufacture of a clamp that allows repair of overhead power lines. The design of mating the components of such a device should simplify its installation when carrying out work on overhead transmission lines, minimizing operations that can be difficult in such conditions.

The technical result achieved by the group of inventions is to simplify the design and reduce the complexity of manufacturing the clamp, simplify and speed up the operations for its installation on the wire, as well as improve the quality of fixing the damaged cores of the overhead transmission line wire.

The claimed repair clip for overhead power transmission lines contains a casing and a saddle made of an electrically conductive material, the saddle length exceeding the casing length. The saddle is made of a grooved profile, and the casing is made in the form of a hollow cylinder, a section of which is removed in a segment corresponding to the wire diameter. In this case, the saddle and the casing are made in such a way that the saddle with its outer surface can be inserted into the casing with the possibility of movement, and the wire placed in the saddle adheres to the inner surfaces of the saddle and the casing after turning the latter.

The coupling of the casing and the saddle occurs without the use of grooves of complex shape, which makes it possible to simplify the manufacture, as well as the installation of the clamp, while forming a means of reliable fixation of the damaged cores with compensation of electrical conductivity.

Adhesion of the wire to the inner surfaces of the saddle and the casing can be ensured by making a bulge at the bottom of the saddle groove. The size of the thickening is chosen such that the center of the gutter bottom circumference is spaced from the center of the circumference of the outer surface of the gutter by a value of Δ, which is (Δ = (D-d)) ⁄2, where D is the outer diameter of the gutter, d is the wire diameter.

For more convenient holding of the saddle during installation, at least one side of the saddle protruding beyond the casing is provided with flats.

On the inner surface of the saddle, transverse grooves are made, which, when installed using electrically conductive adhesives or curing substances (epoxy resins, sealants) filling the bottom of the gutter, when the wire is moved from the upper edge of the gutter to its bottom, they are forced into the upper part of the gutter, which makes it possible to distribute substances evenly, including improving the electrical contact between the wire and the casing.

The repair clamp installation method includes:

bringing the open clamp to the damaged section of the wire until the wire stops in the bottom of the saddle groove,

turning the casing until it closes the wire,

fixing the wire in the clamp.

The fixation of the wire in the clamp can be accomplished by mechanical crimping (crimping), either using conductive adhesives or curing agents, or a combination of mechanical crimping and adhesive or curing agents. When using the combined method of fixing the wire, the substances are applied to the inner surface of the casing and saddle before mechanical pressing, which must be performed before the substances solidify.

The essence of the solution is illustrated by the drawings, which show:

Figure 1

[fig. 1] - general view of the clamp before installation,

Figure 2

[fig. 2] - a sectional clip with an installed wire and an open casing,

Figure 3

[fig. 3] - a clip in section with an installed wire and a closed casing (after turning the casing),

Figure 4

[fig. 4] - general view of the clamp with a closed casing and an installed wire.

To confirm the possibility of a group of inventions implementing its purpose and achieving the claimed technical result, we will consider the options for their implementation.

The claimed repair clamp is a structure consisting of two elements, a saddle 1 and a casing 2, designed to mate with each other. To restore electrical conductivity when the clip is installed on the damaged wire 3, the clip elements are made of an electrically conductive material, mainly aluminum.

The inner element - the saddle 1 is made of a grooved profile, and its outer surface is in the form of a cylinder with an outer diameter less than the inner diameter of the casing 2. In this case, the outer diameter of the saddle 1 should be such that it is possible to install the saddle 1 inside the casing 2, as shown in fig. 1-4. The depth of the groove of the saddle 1 is made such that the inner surface of the casing 2, after its rotation, comes into contact with the wire 3 installed in the saddle 1 (see Fig. 3). Seat groove width 1 is determined by wire diameter 3.

The outer element - the casing 2 is a hollow cylinder, in which the metal is removed in the segment, the dimensions of which correspond to the diameter of the wire 3, that is, the length of the chord of the segment is made such that the wire 3 passes through the resulting hole in the casing 2. The casing 2 must have an inner diameter such so that the saddle 1 fits into the casing 2 tightly enough, but providing free movement both axially and rotationally (for example, with a sliding fit), and the upper surface of the wire 3 installed in the saddle 1, after turning the casing 2, must adhere to the inner surface cover 2.

That is, the saddle 1 and the casing 2 are made of such a shape and size so that the wire 3 installed in the clamp adheres both to the inner surfaces of the saddle 1 and to the inner surface of the casing 2 after its rotation.

To ensure the adherence of the wire 3 to the inner surfaces of the saddle 1 and casing 2, a thickening is made at the bottom of the groove of the saddle 1, due to which the wire 3 is displaced upward from the center of the circumference of the outer surface of the saddle 2. The thickening is made such that the center of the circumference of the bottom of the groove of the saddle 1 is spaced from the center the circumference of the outer surface of the seat groove 1 by the value Δ, which is calculated as: (Δ = (Dd)) ⁄2, where D is the outer diameter of the seat groove 1, d is the diameter of the wire 3. That is, the distance from the bottom of the seat groove 1 to the inner surface of the casing 2 in its closed state is equal to the diameter of the wire 3.

The tight fit of the wire 3 to the inner surfaces of the seat 1 and the casing 2 ensures the effectiveness of both its fixation in the clamp and the compensation of electrical conductivity. The tightness requirements can be reduced by using crimping (crimping) and / or joining the clamping elements with electrically conductive adhesives or curing agents (eg epoxy resins).

The length of the clamp is determined by the length of the missing cores on the damaged wire 3. In this case, the length of the saddle 1 is greater than the length of the casing 2, which increases the convenience of holding the saddle 1 of the clamp when mounting with a clamping tool during the rotation of the casing 2 to create full coverage.

To increase the stability of holding the clamp and, accordingly, to increase the reliability and simplify its installation on the sections of the saddle 1 protruding beyond the casing 2, flats 4 can be made. Placing a single pair of flats 4 on one of the edges of the saddle 1 can be sufficient when manually installing the clamp with gripping it from the side (one side).

If damage to the cores of the wires of overhead power lines is detected or their rupture, the clamp is installed on the damaged section of the wire as follows.

Before installation, the clamp enters the wire 3 in assembled form (see figure 1, 2). For this, the saddle 1 is inserted into the casing 2 and installed so that the cutout in the casing 2 is aligned with the groove of the saddle 1 in order to ensure the unimpeded passage of the wire 3 inside the clamp, that is, in the open form.

Before installing the clamp on wire 3, all cores that have come out of the wire, if possible, should be installed in place or cut off.

The clamp is brought to the damaged section of the wire 3 from below until the wire 3 stops in the bottom of the groove of the saddle 1. The saddle 1 is held using its protruding side parts, the casing 2 is rotated relative to the saddle 1 at an angle of 120-180 ° until the wire 3 is closed in the clamp.

Then, the wire 3 is fixed in the clamp to ensure stable fastening of the damaged cores and the entire wire bundle 3, which will subsequently allow for effective compensation of electrical conductivity.

Various fixing options are possible, including:

Traditional mechanical crimping (crimping) of wire 3 in the area with damaged cores for a better fit of the clamp and restoration of electrical conductivity.

Fixation of wire 3 with the use of conductive adhesives or curing substances (glue, epoxy resin, etc.) Substances are applied to the inner surface of the clamp and, during installation, are distributed along the wires of wire 3, ensuring the restoration of electrical conductivity in the damaged area and fixation of the unwoven wires. The grease prevents moisture from entering the space between the two parts, which improves the electrical properties and corrosion resistance of the wire repair site 3.

A combined method, involving the application of conductive substances, followed by mechanical crimping, which must be performed before the substance hardens (sets). Allows you to get the best result by combining the advantages of two methods of fixing the wire 3 in the clamp.

For effective fixing of the wire 3 in the clamp using adhesives or curing substances, grooves 5 can be made on the inner surface of the saddle 1 and / or casing 2, which help to distribute this substance over the clamp surface for better fixation on the damaged wire 3 and the most effective restoration of electrical conductivity. Preferably, the grooves 5 are made transverse on the inner surface of the saddle 1. When the wire 3 is installed, the adhesive or curing substances are forced up along the grooves 5, thereby pushing the excess glue into the upper part of the wire 3, covered by the casing 2, improving the contact between the casing 2 and the wire 3. And also the inner surface of the saddle 1 is lubricated when it is turned.

The use of additional methods for fixing the clamping elements (crimping and gluing) by compensating for the gaps will further simplify the manufacture of the clamp due to the reduced requirements for the accuracy of the fit of its elements.

Thus, the use of the clamp allows restoring the electrical conductivity of the line and ensuring the reliability of its operation due to the electrical conductivity of the clamp elements.

The claimed group of inventions makes it possible to simplify the operations of mounting a clamp on an overhead power line wire through the use of a simple and reliable clamp design. In particular, when the clamp is installed, the casing is rotated at an angle of no more than 180 ° relative to the seat. The use of a conductive clamp eliminates the increase in resistance resulting from damage to the cores. At the same time, the clamp is simple and easy to manufacture and install. The simple design and the absence of complex grooves make the saddle and shroud easy to mate with each other, making clamping easier and faster. At the same time, the form of mating the clamping elements allows you to create their stable connection with each other and reliably fix the wire.

Claims

A repair clip for wires of overhead power lines, containing a casing and a saddle made of an electrically conductive material, the saddle length being greater than the casing length, the saddle is made of a groove-shaped profile, and the casing is in the form of a hollow cylinder, a section of which is removed in a segment corresponding to the wire diameter, while the saddle and the casing are made in such a way that the saddle with its outer surface can be inserted into the casing with the possibility of movement, and the wire placed in the saddle adheres to the inner surfaces of the saddle and casing after the latter has been turned.
The clamp according to claim 1, characterized in that a thickening is made at the bottom of the saddle groove.
The clamp according to claim 2, characterized in that the thickening is made such that the center of the circumference of the bottom of the gutter is spaced from the center of the circumference of the outer surface of the gutter by the value Δ, which is (Δ = (Dd)) ⁄2, where D is the outer diameter of the gutter, d is wire diameter.
Clamp according to claim 1, characterized in that on at least one side of the seat protruding beyond the casing, flats are made.
The clamp according to claim 1, characterized in that transverse grooves are made on the inner surface of the seat.
A method for installing a repair clamp according to claim 1, including:

bringing the open clamp to the damaged section of the wire until the wire stops in the bottom of the saddle groove,

turning the casing until it closes the wire,

fixing the wire in the clamp.
The method according to claim 6, characterized in that mechanical crimping is performed to fix the wire.
The method according to claim 6 or claim 7, characterized in that conductive curing or adhesives are used to fix the wire.
The method according to claim 7, characterized in that prior to installation on the wire, conductive curing or adhesives are applied to the inner surface of the saddle and the casing, and mechanical pressing is performed before they harden.