RU2717105C1 - Clamp for repair of wires of overhead transmission lines and method for installation thereof - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: group of inventions can be used for repair of high-voltage power transmission line wires with damages of strands and simplifies manufacturing, design of clamp, simplifies and speeds up assembly. Clamp contains a saddle and a casing made of an electrically conductive material; at that, the saddle length exceeds the casing length. Seat is made of chute-shaped profile, and casing in form of hollow cylinder, section of which is removed in segment corresponding to diameter of wire. Said seat is fitted in casing to displace therein. Wire should be able to contact both inner surface of seat and inner surface of jacket. Clamping method includes bringing the clamp to the wire until its rest in the bottom of the chute of the seat, turning the casing before closing the wire and fixing the wire in the clamp. Crimping is used for fixation or current-conducting gluing or hardening substances are applied, or these methods are combined.

EFFECT: invention provides faster clamp installation on wire and higher quality of wires fixation.

9 cl, 4 dwg

Description

The group of inventions relates to the field of electric power industry, namely to linear clamps intended for repairing, in particular, steel-aluminum, aluminum or copper uninsulated wires of overhead power transmission lines (hereinafter - VLEP) having damaged cores and mounted in particular by crimping (pressing). Technical solutions make it possible to carry out both emergency repairs and routine maintenance of power lines.

During the operation of the high-voltage transmission line, various types of wire damage are noted, in particular, the strands of the wire are weaved, damage to its surface under the influence of vibrational vibrations, external forces, etc. Such damage can lead to both increased wire resistance and reduced power transmission efficiency, as well as serious emergency situations. The inventive clamp and the method of its installation can eliminate defects VLEP, which in the future could provoke serious damage and emergency situations.

Currently, repair of damaged or completely destroyed sections of VLEP wires is carried out by installing special connecting clamps in appropriate places that fix the wire, preventing its further unwinding and / or damage with the restoration of the electrical conductivity of the section. Their use allows you 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 that use two halves of a pipe designed to repair damage, with their compression with a special tool. The connection of the half-pipes occurs due to the various form of thorn-groove connecting elements made on their contact surfaces.

For example, a pipe for repairing a power line is known [CN 206992615 U, prior. 05/12/2017, publ. 02/09/2018, H02G 1/14, H02G 1/16], each of which half-pipes contains a groove on one side and a spike on the other, corresponding to each other.

A repair pipe for a power line is also known [CN 202121260 U, prior. from 06/16/2011, publ. 01/18/2012, H01R 4/20, H02G 1/14, H02G 7/00], the half tubes of which are completely identical and contain at each end a groove and a spike at the same time, such that the grooves of one pipe correspond to the spike of the other.

Known repair clamp [RU 2285991, prior. from 05.27.2005, publ. 10.20.2006, IPC (2006.01) H02G 7/08, H01R 4/20] in the form of two identical half-pipes from a special groove-like profile, on each of which a groove is made on one side and a corresponding protrusion on the other, which can be made different shapes from polyhedron to oval. During assembly, one of the half-pipes is installed on the VLEP wire, and the second slides on top, 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 produce pressing with hexagonal dies.

Known devices require to ensure the connection provided by their design with fairly high accuracy when placing the half-pipes relative to each other during installation, which can be difficult when working at heights.

The technical problem to which the group of inventions is directed is the creation of a simple constructively, in use and manufacture of a clamp, which allows repair of high-voltage power lines. The design of the pairing of the components of such a device should simplify its installation when carrying out work on high-voltage lines, minimizing operations that, under such conditions, can be difficult.

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 of installing it on the wire, as well as improve the quality of fixation of damaged core wires of the high-voltage power lines.

The inventive repair clamp for wires VLEP contains made of an electrically conductive material, a casing and a saddle, and the length of the saddle exceeds the length of the casing. The saddle is made of a groove-like profile, and the casing is in the form of a hollow cylinder, a portion of which is removed in a segment corresponding to the diameter of the wire. In this case, the saddle and the casing are made such that the saddle with its outer surface can be inserted into the casing with the possibility of movement, and the wire located in the saddle is adjacent to the inner surfaces of the saddle and the casing after the rotation of the latter.

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

, где D - наружный диаметр желоба, d - диаметр провода.The contact of the wire to the inner surfaces of the saddle and the casing can be ensured by performing thickening at the bottom of the groove of the saddle. The magnitude of the thickening is chosen such that the center of the circumference of the bottom of the gutter is separated from the center of the circumference of the outer surface of the gutter by a value of Δ, which is

Where D - diameter of the outer trough, d - wire diameter.

For more convenient retention of the saddle during installation on at least one side, flats are made on the portion of the saddle protruding beyond the casing.

Transverse grooves are made on the inner surface of the saddle, which when installed using electrically conductive adhesives or curable substances (epoxy resins, sealants) filling the bottom of the gutter, while moving the wire from the upper edge of the gutter to its bottom, are displaced to the upper part of the gutter, which allows distributing substances evenly, including improving electrical contact between the wire and the casing.

A method for installing a repair clamp includes:

- summing the open clamp to the damaged section of the wire until it stops in the bottom of the groove of the saddle,

- rotation of the casing until it closes the wire,

- fixing the wire in the clamp.

Fixation of the wire in the clamp can be performed by mechanical crimping (compression) or using conductive adhesive or curable substances, or a combination of mechanical crimping and adhesive or curable substances. When using the combined method of fixing the wires of a substance, it is applied to the inner surface of the casing and saddle before mechanical crimping, which must be done before the substances solidify.

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

- in FIG. 1 - General view of the clamp before installation,

- in FIG. 2 - sectional clip with installed wire and open casing,

- in FIG. 3 - sectional clip with installed wire and closed casing (after turning the casing),

- in FIG. 4 is a general view of a clamp with a closed casing and an installed wire.

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

The inventive repair clamp is a structure consisting of two elements, a seat 1 and a casing 2, designed to interface with each other. To restore electrical conductivity when installing the clamp on the damaged wire 3, the clamp elements are made of electrically conductive material, mainly aluminum.

The inner element - the seat 1 is made of a groove-like 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 must 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 such that the inner surface of the casing 2 after its rotation is in contact with the wire 3 installed in the saddle 1 (see Fig. 3). The width of the groove of the saddle 1 is determined by the diameter of the wire 3.

The external element - the casing 2 is a hollow cylinder in which 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 so that the wire 3 passes through the hole in the casing 2. The casing 2 must have an inner diameter such so that the saddle 1 enters the casing 2 sufficiently tightly, but providing free movement both along the axis and rotational (for example, with a slip fit), and the upper surface of the wire 3 installed in the saddle 1, after turning the casing 2 should rest It is the inner surface of the housing 2.

That is, the saddle 1 and the casing 2 are made in such a shape and size that the wire 3 installed in the clamp abuts both the inner surfaces of the saddle 1 and the inner surface of the casing 2 after turning it.

, где D - наружный диаметр желоба седла 1, d - диаметр провода 3. То есть расстояние от дна желоба седла 1 до внутренней поверхности кожуха 2 в закрытом его состоянии равно диаметру провода 3.To ensure that the wire 3 adheres to the inner surfaces of the saddle 1 and the casing 2, a thickening is made at the bottom of the groove of the saddle 1, due to which the wire 3 is shifted upward from the center of the circumference of the outer surface of the saddle 2. The thickening is made so 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 groove of the saddle 1 by Δ, which is calculated as:

Where D - diameter of the outer seat trough 1, d - diameter of the wire 3. That is, the distance from the bottom of the saddle 1 to the trough internal surface of the housing 2 in its closed state is equal to the diameter of the wires 3.

The tight fit of the wire 3 to the inner surfaces of the saddle 1 and the casing 2 ensures the effectiveness of both its fixation in the clamp and the compensation of electrical conductivity. Density requirements can be reduced by using crimping (crimping) and / or joining the clamping elements with electrically conductive adhesives or curable materials (e.g., epoxies).

The clamp length is determined by the length of the missing cores on the damaged wire 3. At the same time, 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 rotation of the casing 2 to create full coverage.

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

Upon detection of damage to the conductors of the VLEP wires or their rupture, the clamp is mounted on the damaged section of the wire as follows.

Before installation, the clamp enters the wire 3 in assembled form (see Fig. 1, 2). To do this, the saddle 1 is inserted into the casing 2 and set so that the cutout in the casing 2 is aligned with the groove of the saddle 1 to ensure unhindered passage of the wire 3 into the clamp, that is, in the open form.

Before installing the clamp on wire 3, all veins emerging from wire 3 should, if possible, be put in place or cut.

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

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

Various fixation options are possible, including:

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

2. Fixation of wire 3 with the use of conductive adhesives or curable substances (glue, epoxy resin, etc.). The substances are applied to the inner surface of the clamp and, when installed, are distributed over the conductors of wire 3, ensuring the restoration of electrical conductivity in the damaged area and the fixation of braided wires. The lubrication prevents the penetration of moisture into the space between the two parts, which improves the electrical properties and corrosion resistance of the repair site of the wire 3.

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

To effectively fix the wire 3 in the clamp using adhesive or curable substances on the inner surface of the saddle 1 and / or the casing 2, grooves 5 can be made to facilitate the distribution of this substance over the surface of the clamp for its 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 seat 1. When installing the wire 3, adhesive or curable substances are forced upward in the grooves 5, thereby pushing excess glue into the upper part of the wire 3, closed by the casing 2, improving the contact between the casing 2 and the wire 3. And also lubricates the inner surface of the seat 1 when it is rotated.

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

Thus, the use of the clamp allows you to restore the electrical conductivity of the line and ensure the reliability of its operation due to the electrical conductivity of the clamp elements.

The claimed group of inventions allows to simplify the installation of the clamp on the wire VLEP through the use of a simple and reliable design of the clamp. In particular, when installing the clamp, the casing is rotated by an angle of not more than 180 ° relative to the saddle. The use of a conductive clamp eliminates the increase in resistance that has occurred with core damage. At the same time, the clamp is simple and convenient to manufacture and install. Due to the simple design and the absence of grooves of complex shape, the saddle and the casing are easily mated with each other, which allows to simplify and speed up the installation of the clamp. Moreover, the form of pairing of the clamping elements allows you to create a stable connection between them and securely fix the wire.

Claims (12)

1. A repair clamp for wires of overhead power lines, comprising a casing and a seat made of an electrically conductive material, the seat being longer than the casing, the saddle is made of a groove-shaped profile, and the casing is in the form of a hollow cylinder, a portion of which is removed in a segment corresponding to the diameter of the wire, the saddle and the casing are made such that the saddle with its outer surface can be inserted into the casing with the possibility of movement, and the wire located in the saddle is adjacent to the inner surfaces of the saddle and the casing after the last turn. 2. The clamp according to claim 1, characterized in that a thickening is made at the bottom of the saddle groove. 3. 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 separated from the center of the circumference of the outer surface of the gutter by Δ, which

Where D - diameter of the outer trough, d - wire diameter. 4. The clamp according to claim 1, characterized in that at least on one side flats are made on the portion of the saddle protruding beyond the casing. 5. The clamp according to claim 1, characterized in that the transverse grooves are made on the inner surface of the saddle. 6. The installation method of the repair clamp according to claim 1, including: - summing the open clamp to the damaged section of the wire until it stops in the bottom of the groove of the saddle, - rotation of the casing until it closes the wire, - fixing the wire in the clamp. 7. The method according to p. 6, characterized in that for fixing the wires perform mechanical crimping. 8. The method according to any one of paragraphs. 6 or 7, characterized in that for fixing the wires using conductive cured or adhesive. 9. The method according to p. 7, characterized in that prior to installation on the wire on the inner surface of the seat and the casing conductive cured or adhesive substances are applied, and mechanical crimping is carried out before they harden.

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