RU193723U1 - Tension clamp - Google Patents

Abstract

The utility model relates to the field of electric power industry and can be used as tension clamps for attaching aluminum and steel-aluminum, bare wires, as well as insulated wires intended for transmission of electric energy via overhead power transmission lines of 6-110 kV overhead lines to anchor-angle supports. The tension clamp consists of a body with a profiled groove and a pressure die with a profiled groove on the bottom of the die. Profiling the gutter is made in the form of a wave with a radius of peaks and troughs varying in the range R = (3 ÷ 7) mm, the height of the wave profile varies in the range H = (7 ÷ 10) mm, the profile step varies in the range T = (9 ÷ 14 ) mm. The body and pressure plate are made of non-magnetic material - aluminum or an alloy based on aluminum. The tightening bolts located in the cylindrical holes of the housing and the die, the bolt heads are recessed to their full height in the upper part of the pressure die. The length of the holes for the bolts is determined by the length of the bolt plus the amount of its movement, depending on the diameter of the wire. In this case, the tension clamp is designed to work with wires with a diameter of ∅12.2 ÷ 15.4 mm. The technical result of the utility model is the tension clamp, which is distinguished by the elementary design, and as a result, the minimum cost of installation, assembly and disassembly of the clamp, a significant reduction in costs manufacturing of injection equipment, stable wire termination strength (95% of the nominal amount of tensile wire). The use of non-magnetic materials in the manufacture of the housing and the clamping die of the clamp, the protection of the bolt heads, made it possible to escape from magnetization reversal losses at least twice.

Description

The utility model relates to the field of electric power and can be used as tension clamps for attaching aluminum and steel-aluminum bare wires to insulated-angle supports, as well as insulated wires, designed to transmit electric energy through an overhead power transmission line of 6-110 kV overhead lines.

Known tension clamp (see description of patent for invention RU 2138109, H02G 1/04; H02G 7/02; published: 09/20/1999). The invention relates to the field of electric power and can be used to capture and tension wires and lightning protection cables of overhead power lines.

The disadvantages of this tension clamp include difficulties in assembly. Requires more complex operations for direct installation on a power line. Has the design of a deforming wire when it goes into a loop. It cannot be used for wires with a large cross section of a steel core.

Known tension clamp (see the description of the patent for the invention RU 2334328, H02G 7/00; published: 09/20/2008, Bull. No. 26). The invention relates to the field of electric power and can be used to capture and tension wires and lightning protection cables of overhead power lines.

The main disadvantages include difficult to manufacture foundry equipment. The tension clamp does not have a fixing fixture, the coaxial line of the main tensile force, which relieves stress from the aluminum housing of the tension clamp. Increased complexity in the assembly and disassembly of injection molds.

Known tension clamp (see the description of the patent for the invention No. 1735955, H02G 7/02, published: 04.17.1987) The invention relates to the field of electric power overhead power lines.

This clamp in its design relates to wedge type clamps.

This clamp has the following disadvantages, the difficulties associated with providing the required force in the process of clamping the wire, the exact calculation of the parameters of the jamming element, the clamping elements of the clamping body (wedge shape, jamming angle, the dimensions of the ledge under the clamping elements, the geometric correspondence of the conical cavity of the clamping housing with the horizontal part of the longitudinal the groove of the jamming element along which the clamping of the wire passes).

Known Tension clamp (see the description of patent for invention No. 1117755, H02G 7/02, publ. 07.10.84) The invention relates to the field of electric power overhead power lines, and in particular to the design of tension clamps for attaching wires of overhead power lines of various classes.

The disadvantages of this model include the large metal consumption and the complexity of manufacturing, due to the complex shape of the body and the die with convex-concave shaped grooves, multi-element clamping due to the use of several (at least two) U-shaped bolts. The complexity, multi-operation and inconvenience of mounting the clamp on the line, it is necessary to carry out such preliminary operations as disassembling the tension clamp, its subsequent assembly and tightening a relatively large number of tightening bolt clamp connections.

Known tension clamp (see the description of the patent for the invention RU 2360344, H02G 7/02; published: 06/27/2009, Bull. No. 18). The invention relates to the field of electric power and can be used to capture and tension wires and lightning protection cables of overhead power lines.

The disadvantages of this model include the following, the complexity of mounting the wire, the absence of a special eyelet to simplify installation work, the relative clamping force of the wire. Due to the fact that the distance between the holes is made at a sufficiently large distance, in this regard, it is necessary to increase the metal consumption for the manufacture of the pressure die. A large mass relative to the claimed utility model, which increases the intensity and complexity of costs.

The objective of the claimed utility model is the creation of a tension clamp for fastening aluminum, steel-aluminum, bare wires, as well as insulated wires with a diameter of 12.2 ÷ 15.4 mm, which solves the following problems in the manufacture and operation of tension clamps overhead transmission lines VL 6-110 kV

- the proposed design of the housing and the clamping die, can significantly reduce the complexity, costs associated with the manufacture of foundry equipment, reducing the cost of the tension clamp and maintenance during production;

- to provide a simple, reliable installation of a tension clamp of a new design with minimal costs;

- elimination of the possibility of mechanical wear of the wire due to its friction against the clamp body by reducing static and dynamic loads in the area of the wire attachment;

- to reduce losses on magnetization reversal, at least twice;

- the proposed design of the tension clamp provides stable wire termination strength (at least 95% of the tensile strength of the wire)

The essence of the claimed utility model is as follows.

The proposed design of the tension clamp for attaching aluminum, steel-aluminum, bare wires, as well as insulated wires to the anchor-angle supports of the overhead power line, comprising a housing with a profiled groove, a pressure die with a profiled groove on the bottom of the die made of non-magnetic material, aluminum or alloy based on aluminum. Profiling the gutter is made in the form of a wave with a radius of peaks and troughs varying in the range R = (3 ÷ 7) mm, the height of the wave profile varies in the range H = (7 ÷ 10) mm, the profile step varies in the range T = (9 ÷ 14 ) mm. The tightening bolts are located in the cylindrical holes of the housing and the die. In this case, the heads of the tightening bolts are recessed to the full height in the upper part of the pressure die. The length of the holes for the bolts is determined by the length of the bolt plus the magnitude of its movement, depending on the diameter of the wire. In this case, the tension clamp is designed to work with wires with a diameter of ∅12.2 ÷ 15.4 mm. The use of non-magnetic materials in the manufacture of the clamp housing, the pressure plate, and the protection of the bolt head made it possible to avoid at least two times the magnetization reversal loss.

The proposed design of the tension clamp significantly reduces the complexity of manufacturing foundry equipment and maintenance in the production process. The claimed tension clamp for attaching the wires of overhead power lines is distinguished by its elementary design, minimal costs for mounting, assembling and disassembling the clamp, and a significant reduction in the cost of manufacturing injection equipment. It has stable wire termination strength (at least 95% of the tensile strength of the wire).

The installation of this clamp is carried out using hand tools (wrenches), which can greatly simplify the installation work, excluding the use of both hydraulic presses and manual mechanical presses for crimping wires with tension clamps of known designs. It should be noted that when crimping the wires, equipment is involved that increases the number of operations when installing the tension clamp.

The essence of the utility model is illustrated by the following drawings. The proposed design of the tension clamp (Fig. 1) consists of a housing 1, with a profiled groove, a pressure plate 2 with a profiled groove on the bottom of the die, the housing and the die are made of non-magnetic material, aluminum or an aluminum-based alloy, finger 3 for attachment to an insulating pendants made of high-carbon steel with galvanized coating on the outer surface of the finger, tightening bolts 4 located in the cylindrical holes of the housing and die. In this case, the bolt heads are recessed in the upper part of the die. On (Fig. 2) shows a General view of the proposed tension clamp.

The proposed design of the tension clamp significantly reduce the complexity of manufacturing foundry equipment and maintenance in the production process. The claimed tension clamp for fastening the wires of overhead power lines is distinguished by its elementary design, minimal costs for mounting, assembling and disassembling the clamp, and a significant reduction in the cost of manufacturing injection tools. The use of non-magnetic materials in the manufacture of the clamp housing and the pressure plate allowed avoiding the magnetization reversal losses at least twice. Provides stable wire termination strength (at least 95% of wire breaking strength).

At the moment, it has no structural analogues, both on the domestic and foreign markets and is preparing for industrial production for pilot production.

Claims (4)

1. A tension clamp for wires of an overhead power transmission line, comprising a housing with a profiled groove and a pressure die with a profiled groove, characterized in that the clamp housing and the pressure die are made of non-magnetic aluminum material, profiling the groove is made in the form of a wave with a radius of peaks and troughs, varying in the range R = (3 ÷ 7) mm, the height of the wave profile varies in the range H = (7 ÷ 10) mm, the profile step varies in the range T = (9 ÷ 14) mm, while the heads of the tightening bolts are recessed to the full height upper part when imnoy dies, the length of bolt holes defined by the length of the bolt plus the magnitude of its displacement depending on the wire diameter. 2. The tension clamp according to claim 1, characterized in that the clamp housing and the clamping bar are made of non-magnetic material, an alloy based on aluminum. 3. The tension clamp according to claim 1, characterized in that the profiling of the gutter is trapezoidal in shape, the radii of rounding of the vertices of the trapezoid vary in the range R = (2 ÷ 4) mm. 4. The tension clamp according to claim 1, characterized in that the profiling of the gutter is rectangular, the radii of rounding of the vertices of the rectangle vary in the range R = (2 ÷ 4) mm.

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