RU2759263C1 - Branch clamp for connecting the main wire to the branch wire - Google Patents

Abstract

FIELD: electric power industry.SUBSTANCE: invention relates to the electric power industry; it can be used to branch wires of overhead power transmission lines from the main wire. A branch clamp is a T-shaped structure having at least one conductive winding, including at least one set of L-shaped conductive coils with one direction of winding, wound on a wire, and a set of L-shaped power coils that perform the function of a locking protector with the opposite direction of winding, wound on conductive coils. To reduce the weight of the branch clamp and improve its manufacturability, the clamp structure is made so that power coils of the locking protector protrude beyond the current-conducting winding with winding directly on the wire, while power coils of the locking protector have sections with different diameters in the places of winding on the current-conducting winding and at the ends outside the current-conducting winding when winding on the wire.EFFECT: technical result is obtaining the branch clamp for connecting the main wire to the branch wire.7 cl, 4 dwg

Description

The invention relates to the electric power industry, and can be used for branching wires of overhead power lines from the main wire.

Known branch clamp containing means for connecting the main and branch wires (RU 2559856C2, 08/20/2015). The clamp is a T-shaped structure made of at least two spiral L-shaped conductive wire strands. To ensure a tight permanent electrical contact and prevent slippage of the wires to be connected in the clamp, a protector-retainer is wound over the conductive wrap. The retainer protector is made of at least two spiral conductive wire strands of L-shape. The known design makes it possible to connect wires, both with the same and with different outer diameters. In this case, in order to equalize the diameters of the main and branch wires, an equalizing layer of conductive spirals or strands is pre-wound. Aligning strands can be present on the main and branch wires, or on one of them. The described design options have at least one conductive layer of L-shaped spirals and one layer, which is a protector-fixer of L-shaped spirals. Conductive braid can consist of both individual spirals and strands. The strand consists of several spirals obtained by gluing. The gluing of the spirals can be performed with an abrasive to increase the frictional forces between the mating sections of the clamp with the wire. The retainer protector can consist of both individual spirals and glued strands.

The analysis of the above described known variants of the technical solution according to the patent RU 2559856 showed that they contain spiral elements that can be eliminated, or their length can be significantly reduced.

The technical problem solved by the claimed invention is a decrease in material consumption and a decrease in the mass of the branch clamp while maintaining reliability during operation.

The claimed invention, like the closest analogue, is a branch clamp of a spiral type used to connect a main wire with a branch wire, while the clamp is a T-shaped structure having at least one conductive layer, including at least one set of L-shaped conductive spirals, with one winding direction, wound on the wire, and a set of L-shaped power spirals, performing the function of a protector-retainer with an opposite winding direction, wound on the conductive spirals. The spirals of the conductive strand and the protector-fixator can be collected in strands and glued with the application of abrasive materials.

To solve this technical problem, the claimed invention proposes an approach to the design of branch clamps, based on the use of spiral elements with stepped geometry. The technical problem is solved due to the fact that the L-shaped force spirals (or strands) of the protector-retainer are wound over the spirals (or strands) of the conductive layer with a transition at the ends directly to the main or branch wire. The power spirals (or strands) of the retainer protector along their length have a variable diameter - a stepped design, which is characterized as follows: in the part contacting with the spirals (or strands) of the conductive layer, the diameter of the power strands of the retainer protector is larger (calculated for the outer diameter of the spirals or strands of conductive strand), while outside the conductive strand, the inner diameter of the power strands of the protector-retainer corresponds to the outer diameter of the main or branch wire, and at the point of transition from the conductive layer to the corresponding wire, the diameter of the power coils (or strands) of the protector-retainer changes, as a result, their shape is like a step.

The technical result achieved in the manufacture and use of the claimed invention is that, other things being equal, the weight of the clamp is significantly reduced, and the manufacturability of the structure is improved. The concept of manufacturability of a structure includes the number of constituent elements, time for their manufacture, time for assembly of the entire structure, total material consumption, time for repairs during operation, etc. All of these components are undergoing a change in the direction of their reduction, which made it possible to make the design more technological. At the same time, a smoother transition in the change in bending stiffness from the middle of the connection to the periphery is provided, since the bending stiffness of the declared structure is greatest in the middle towards the periphery - to the ends, and the less the bending stiffness at the ends of the product differs from the bending stiffness of the wire itself, the longer the service life such a joint structure in the process of wind action.

The technical result, which is achieved by the claimed invention, consists in saving the metal of the power strands of the protector-retainer and spirals (or strands) of the conductive strand by reducing their length, weight while maintaining all the necessary performance properties of the clamp inherent in analogues known from the prior art. The required characteristics of the branch clamp provide a smoother transition in the change in bending stiffness from the middle of the connection of the main and branch wires to the periphery due to the transition of the power spirals (or strands) of the protector-retainer to the wire with a corresponding decrease in their inner diameter of winding, while winding the power strands of the protector of the retainer, made crosswise with respect to the spirals or strands of the conductive layer (i.e. in the opposite direction), further enhances this effect. Due to the proposed design, the power spirals (or strands) of the protector-retainer tightly press the spirals (or strands) of the conductive layer to the main and to the branch wire and, due to the stepwise reduction in the diameter of the power strands of the protector-retainer when switching to the corresponding wire, they reliably hold the conductive layer from moving relative to the wire, which makes it possible to reduce the length of the spirals (or strands) of the conductive layer, and also to reduce the length of the force spirals of the protector-retainer.

The fact that individual spirals of the conductive layer and / or protector-retainer can be assembled into strands and glued with the application of abrasive materials makes it possible to further reduce their length and material consumption, since such an arrangement further increases the friction force arising between the protector-retainer and the conductive poviv, as well as between the main and branch wires.

As a result, the reliability of the clamp operation is ensured when operating on overhead power lines.

The invention is illustrated by the following drawings.

FIG. 1. The design of the branch clamp according to the closest analogue. Connection of two wires of the same diameter (D ₁ = D ₂ ).

FIG. 2. The design of the branch clamp in accordance with the claimed invention. A branch terminal in the form of a stepped design, connecting two wires of the same diameter (D ₁ = D ₂ ).

FIG. 3. The design of the branch clamp according to the closest analogue. Connection of two wires of different diameters: D ₁ ≠ D ₂ .

FIG. 4. The design of the branch clamp in accordance with the claimed invention. Branch terminal in the form of a stepped design, connecting two wires of different diameters (D ₁ ≠ D ₂ ))

In the drawings, the numbers indicate:

1 - trunk wire;

2 - branch wire;

3 - conductive layer;

4 - protector-retainer;

5 - an equalizing layer of conductive spirals (strands) of wire.

The branch clip (see Fig. 1) for the main wire 1 and the branch wire 2 consists of at least one set of conductive spirals 3, which have an L-shaped shape, and a set of protector-retainer spirals 4, also having Г- figurative form. To ensure the total cross-section of the throughput area of the main wire 1, the number of sets of conductive strand 3 in the clamp can be more than one.

FIG. 4 schematically shows the design of the claimed branch clamp, in which the spirals of the protector-retainer 4 and the conductive strand 3 are made of spiral elements of the stepped type.

The conductive strand 3 and the protector-retainer 4 can consist of both individual spirals and strands. Strands of conductive strand 3 or protector-retainer 4 are formed from separate spirals, which are collected in strands and glued, in a particular case, with the application of abrasive materials, which additionally makes it possible to reduce their length, since such an implementation further increases the friction force arising between the protector - a clamp and a conductive layer, as well as between wires (main or branch) and a conductive layer.

Spirals or strands of conductive strand 3 are made of materials with low ohmic resistance. At one end, a spiral or a strand of conductive strand 3 is wound on the main wire 1, and at the other end - on the branch wire 2 (see Fig. 2).

Trunk 1 and branch 2 wires can have both the same outer diameter and different diameters D ₁ and D ₂ . In the second case, the spirals or strands of the conductive layer 3 will also represent a stepped L-shaped structure with a stepped change in diameter when changing from a main wire of one diameter D ₁ to a branch wire of a different diameter D2 (see Fig. 4).

FIG. 3 shows a structure characterizing the closest analogue, in which, to equalize the diameters of the main and branch wires, an equalizing conductive layer of spirals or strands is pre-wound. Aligning conductive strands can be present on the main or branch wires, or on both wires. In contrast to the closest analogue shown in FIG. 3, in which it is required to use a leveling layer, in the claimed invention due to the implementation of a conductive layer of a stepped structure, the leveling layer is not required, this function is performed by the step structure of the claimed invention.

In accordance with the claimed invention, a protector-retainer 4, made of spiral elements of a stepped structure, is wound over the conductive layer 3. The retainer protector 4 can consist of both individual spirals and strands formed by glued L-shaped spirals. The protector-retainer 4 creates the forces necessary to press the current-carrying spirals 3 to the main 1 and branch 2 wires and provides the required strength properties of the entire structure. The strands of the protector-retainer 4, depending on the strength requirements, can be glued with an abrasive in the particular case of execution, both in individual sections and along its entire length. At the ends, the protector-retainer 4 is mounted with one end on the main wire 1, and with the other end on the branch wire 2 outside the conductive layer 3.

The spirals of the protector-retainer 4 are made of steels with high ultimate tensile strength.

Each overlying layer of spirals of the claimed branch clamp has an opposite direction of winding with respect to the underlying layer. As a result, the manufactured structure consists of at least one conductive strand and one protector-retainer. The protector-retainer and the conductive layer have opposite directions of winding. The conductive strand has a stepped design for the case of branching wires of different diameters, and the protector-retainer always has a stepped design, since it is wound over the conductive strand, and passes to the wire at the ends.

In cases where it is necessary to connect two wires of significant cross-section, the conductive layer of the branch clamp is made in such a way that the total cross-section of the conductive layer is not less than the cross-section of the wire. If this cannot be done with one twist, then in this case it is necessary to use another conductive set of L-shaped spirals, which is wound over the first.

Claims (7)

1. A spiral-type clamp used to connect the main wire with a branch wire, which is a T-shaped structure, having at least one conductive set of L-shaped spirals with a constant outer diameter, with one direction of winding, wound on the main wire and branched wire, and a set of L-shaped power spirals in the form of a protector-retainer with the opposite direction of winding, wound on spirals or strands of a conductive layer, characterized in that the power spirals of a protector-retainer extend beyond the limits of a conductive layer with a winding directly on the wire, while the power spirals of the protector-retainer have sections with different diameters at the points of winding on the conductive layer and at the ends outside the conductive layer when winding onto the wire. 2. A clamp according to claim 1, characterized in that the spirals of the conductive layer are assembled in strands and glued in part or along the entire length, both with and without the application of an abrasive. 3. A clamp according to claim 1, characterized in that the power spirals of the protector-retainer are collected in strands and glued partially or along the entire length, both with and without the application of an abrasive. 4. A clamp according to claim 1, characterized in that the spirals or strands of the conductive strand have different outer diameters within the same spiral (strand). 5. The clamp according to claim. 1, characterized in that the number of conductive sets of L-shaped spirals (strands) can be more than one. 6. The clamp according to claim 1, characterized in that the number of power sets of L-shaped spirals (strands) in the form of a protector-retainer can be more than one. 7. The clamp according to claim. 1, characterized in that each overlying layer of the spirals of the conductive layer or protector-lock has an opposite direction of winding with respect to the underlying layer.

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