RU2759422C1 - Clamp for repairing a ground wire and an overhead power line wire and method for installation thereof - Google Patents

Abstract

FIELD: electrical power engineering.SUBSTANCE: clamp for repairing a ground wire and an overhead power line wire comprises a casing, a seat, and mounting clamps, made of an electrically conductive material. The seat constitutes a chute with an insert, the outer radius whereof is equal to the inner radius of the chute. Longitudinal cuts are made in the casing and the seat at the points of installation of the mounting clamps, the length of the seat exceeds the length of the casing, the casing is made in the form of a hollow cylinder, a section whereof is removed in the segment corresponding to the diameter of the wire. The seat is made so as to be movably insertable in the casing by the outer surface thereof, and the wire placed in the seat adjoins the inner surfaces of the seat, insert and casing after rotation of the latter.EFFECT: increased strength of the repaired section of the wire.6 cl, 4 dwg

Description

The invention relates to the field of power engineering, namely to linear clamps intended for repair, in particular, steel-aluminum, aluminum or copper wires and ground wires of overhead power lines (hereinafter referred to as overhead power lines) with damaged cores. The invention allows for both emergency repairs and routine maintenance of overhead transmission lines.

During the operation of the overhead transmission line, damage to the ground wire and the steel core of the overhead transmission line wire occurs under the influence of corrosion, vibration vibrations and other external force effects, which can lead to serious accidents. The claimed clamp and the method of its installation allow eliminating the defects of the overhead transmission line, which in the future can 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 and strength of the section. Their use makes it possible to compensate for the increase in resistance that occurs when the wire cores are damaged, but cannot compensate for large losses of strength.

For example, from the prior art there is known a repair clamp for wires of overhead power lines, comprising a casing and a saddle made of an electrically conductive material, and the length of the saddle exceeds the length of the casing. 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. 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 adjoins the inner surfaces of the saddle and casing after turning the latter (RF patent No. 2717105, publ. 03/18/2020).

The disadvantage of the known device is the insufficient strength of the repaired section of the wire.

The technical result achieved by the group of inventions consists in increasing the strength of the repaired section of the wire.

The claimed technical result is achieved in that the clamp for repairing the ground wire and the wire of the overhead power line contains a casing made of electrically conductive material, a saddle and fastening clamps, the saddle is a groove with an insert, the outer radius of which is equal to the inner radius of the groove, longitudinal slots are made in the casing and saddle in the places where the fastening clamps are installed, the saddle length exceeds the length of the casing, the casing is made in the form of a hollow cylinder, the section of which is removed in a segment corresponding to the wire diameter. The saddle is made so that 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, insert and casing after turning the latter.

The casing, seat and clamping straps can be made of steel.

The saddle can have at least two inserts inserted one into the other.

In the insert, longitudinal slots can also be made in the places where the fastening clamps are installed.

, где D - наружный диаметр желоба седла, d - диаметр провода.The total thickness of the saddle and insert or of the saddle and inserts is such that the center of the circumference of the inner surface of the insert or insert having the smallest radius of the inserts is spaced from the center of the circumference of the outer surface of the saddle groove by Δ, which

, where D is the outer diameter of the saddle groove, d is the wire diameter.

The connection of the casing and the saddle occurs 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 the electrical conductivity and strength of the wire section.

A method of installing a clamp for repairing a ground wire and an overhead power line wire includes:

- bringing the open clamp to the damaged section of the wire until the wire stops at the bottom of the insert groove,

- turning the casing until it closes the wire,

- installation of fastening clamps on the casing and saddle.

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

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

- in Fig. 1 is a general view of the clamp before installation with an open casing;

- in Fig. 2 - a sectional clip with an installed wire and a closed casing, without clamps;

- in Fig. 3 - a sectional clip with an installed wire and a closed casing (after turning the casing), without clamps;

- in Fig. 4 is a general view of a clamp with a closed casing, clamps and a wire (ground wire) installed in it.

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 containing a casing 1, a saddle 2, which is a groove with an insert 3 intended for mating with each other. To restore electrical conductivity when the clip is installed on the damaged wire 4, the clip elements are made of an electrically conductive material, for example, steel.

, где D - наружный диаметр желоба седла, d - диаметр провода так, чтобы обеспечивать возможность установки седла 2 внутрь кожуха 1, как показано на фиг. 1-4. Глубина желоба седла 2 выполняется такой, чтобы внутренняя поверхность кожуха 1 после его поворота соприкасалась с установленным в седле 2 проводом 4 (см. фиг. 3). Ширина желоба седла 2 равна диаметру провода 4.The saddle 2 is made of a grooved profile, the outer surface of which is made in the form of a cylinder. The outer diameter of the groove of the seat 2 is made equal to the inner diameter of the casing 1, and the outer radius of the surface of the insert 3 is equal to the inner radius of the groove of the seat 2. If there is an additional insert (s) in the clamp, its outer radius is less than the inner radius of the insert 3, so that the additional insert can be placed in insert 3. Thus, the inner diameter of the casing 1 is equal to the sum of the wire diameter, the thickness of the insert (s) and the thickness of the seat. The cumulative thickness of the saddle and insert is such that the center of the circumference of the inner surface of the insert (the insert having the smallest radius of the inserts) is spaced from the center of the circumference of the outer surface of the saddle groove by Δ, which is

, where D is the outer diameter of the saddle groove, d is the wire diameter so as to make it possible to install the saddle 2 inside the casing 1, as shown in FIG. 1-4. The depth of the groove of the saddle 2 is made such that the inner surface of the casing 1, after its rotation, comes into contact with the wire 4 installed in the saddle 2 (see Fig. 3). The width of the groove of the seat 2 is equal to the diameter of the wire 4.

The casing 1 is a hollow cylinder, in which the metal is removed in the segment, the dimensions of which correspond to the diameter of the wire 4, that is, the length of the chord of the segment is made such that the wire 4 passes through the resulting hole in the casing 1. The casing 1 must have an inner diameter such that the seat 2 entered the casing 1 tightly enough, but at the same time ensuring free movement both axially and rotationally (for example, with a sliding fit), and the upper surface of the wire 4 installed in the saddle 2, after turning the casing 1, should adhere to the inner surface of the casing 1. That is, the saddle 2 and the casing 1 are made of such a shape and size so that the wire 4 installed in the clamp adjoins both the inner surfaces of the saddle 2 and the inner surface of the casing 1 after its rotation.

Thus, the saddle 2 and the insert 3 (inserts) form a thickening, due to which the wire 4 is displaced upward from the center of the circumference of the outer surface of the saddle 2, which ensures the adherence of the wire 4 to the inner surfaces of the casing 1, the seat 2 and the insert 3 (inserts).

The distance from the inner surface of the insert 3 (the insert having the smallest radius of the inserts) to the inner surface of the casing 1 in its closed state is equal to the diameter of the wire 4. Additional inserts are needed to ensure a snug fit of the wire 4 to the clamp.

The tight fit of the wire 4 to the inner surfaces and the casing 1, the saddle 2 and the insert 3 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 members 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 4. In this case, the length of the saddle 2 and insert 3 is greater than the length of the casing 1, which ensures that the saddle 2 of the clamp is retained during installation with the clamping tool during the rotation of the casing 1 to create full coverage of the wire.

Clamps 5 and slots 6 for them in casing 1, saddle 2 and insert 3 increase the clamping pressure on wire 4, which helps to keep the clamp on the wire, increasing the strength of the repaired area

If damage to the conductors of the overhead transmission lines is detected or their rupture, the installation of the clamp on the damaged section of the wire (ground wire) is carried out as follows.

Before installing the clamp on wire 4, all cores that come out of the wire 4 should, if possible, be installed in place or cut off.

Insert 3 or inserts (depending on the thickness of wire 4) are inserted into the saddle 2, and the saddle 2 - into the casing 1 and installed so that the cutout in the casing 1 is aligned with the groove of the saddle 2, and the insert 3 is in the groove of the saddle 2, so, to ensure the unhindered passage of the wire 4 inside the clamp (see Fig. 1, 2).

The clamp is brought to the damaged section of the wire 4 from below until the wire 4 stops in the bottom of the saddle groove 2. The saddle 2 is held using its lateral parts protruding beyond the casing 1, the casing 1 is rotated relative to the saddle 2 at an angle of 120-180 ° until the wire 4 is closed in the clamp.

Then, the wire 4 is fixed in the clamp to ensure stable fastening of the damaged cores and the entire wire bundle 4, which will subsequently allow for effective compensation of electrical conductivity.

Various fixing options are possible, including:

1. Traditional mechanical crimping (crimping) of wire 4 in the area with damaged cores for a better fit of the clamp and restoration of electrical conductivity.

2. Fixation of wire 4 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 conductors of wire 4, ensuring the restoration of electrical conductivity in the damaged area and fixation of unwoven conductors. The grease prevents moisture from penetrating into the space between the two parts, which improves the electrical properties and corrosion resistance of the wire repair site 4.

3. A combined method, involving the application of conductive substances, followed by mechanical pressing, which must be performed until the moment when the substance (lubricant) hardens (sets). Allows you to get the best result by combining the advantages of two methods of fixing the 4 wire in the clamp.

After turning the casing 1 at the ends of the casing 1 and the saddle 2, the clamps 5 are installed in the slots 6 and tightened.

The multi-layer saddle due to the presence of an insert (s) in it and the presence of longitudinal slots makes it possible to reduce the force required to tighten the clamps.

The use of additional methods of 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 a clamp allows you to restore the electrical conductivity of the line by making its elements from an electrically conductive material (steel, aluminum) and to ensure the reliability of the line by increasing the tensile and breaking strength of the wire.

The claimed group of inventions makes it possible to simplify the operations of mounting a clamp on a wire (ground wire) of an overhead power transmission line through the use of a simple and reliable clamp design. The use of a conductive clamp allows you to eliminate the increase in resistance that has occurred with damage to the cores. Moreover, the clamp is simple and easy to manufacture and install. The simple design and the absence of complex grooves make the shroud, seat and insert easy to mate with each other, making it easier and faster to install the clamp. The mating form of the clamping elements allows you to create a stable connection between them and securely fix the wire.

Claims (9)

1. Clamp for repairing ground wire and overhead power line wire, containing a casing made of electrically conductive material, a saddle and fastening clamps, the saddle is a groove with an insert, the outer radius of which is equal to the inner radius of the groove, longitudinal slots are made in the casing and saddle at the places where the fasteners are installed clamps, the length of the saddle exceeds the length of the casing, the casing is made in the form of a hollow cylinder, a section of which is removed in a segment corresponding to the diameter of the wire, while the saddle is made so that its outer surface can be inserted into the casing with the possibility of movement, and the wire placed in the saddle adjoins to the inner surfaces of the seat, insert and casing after turning the latter. 2. Clamp for repair of ground wire and overhead power line wire according to claim 1, characterized in that the casing, saddle and fastening clamps are made of steel. 3. A clamp for repairing a ground wire and an overhead power line wire according to claim 1, characterized in that the saddle has at least two inserts. 4. Clamp for repair of ground wire and overhead power line wire according to claim 1, characterized in that longitudinal slots are made in the insert in the places where the fastening clamps are installed. 5. Clamp for repairing ground wire and overhead power line wire according to any one of paragraphs. 1, 2, characterized in that the total thickness of the saddle and insert or saddle and inserts is such that the center of the circumference of the inner surface of the insert or insert having the smaller radius of the inserts is spaced from the center of the circumference of the outer surface of the saddle groove by Δ, which

, where D is the outer diameter of the saddle groove, d is the wire diameter. 6. The method for installing the clamp according to claim 1, including: - bringing the open clamp to the damaged section of the wire until the wire stops at the bottom of the insert groove, - turning the casing until it closes the wire, - installation of fastening clamps on the casing and saddle.

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