RU2723435C1 - Tension clamp - Google Patents

Abstract

FIELD: electric power engineering.SUBSTANCE: invention relates to the field of electric power engineering and can be used as tension clamps of aluminium and steel-aluminium non-insulated wires intended for transmission of electric power via overhead power transmission line. Design of the tension clamp consists of a casing made of nonmagnetic material, including aluminium or aluminium-based alloy, tightening bolts located in cylindrical holes of the casing, and a die. Tightening bolts are "hidden" to entire height in upper housing. Length of holes for bolts is determined by length of bolt plus value of its displacement depending on diameter of wire.EFFECT: technical result of the invention is use of non-magnetic materials when making the clamping body, clamping dies, protection of bolts and nuts, which allowed to avoid losses on remagnetization and crown as minimum in 4 times.1 cl, 3 dwg

Description

The invention relates to the field of electric power and can be used as tension clamps for fastening aluminum and steel-aluminum, non-insulated wires to the anchor-angle supports intended for transmitting electric energy through an overhead power line.

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. It has a design that more deforms the wire when it goes into a loop. It cannot be used for wires with a large cross section of the steel core.

Known tension clamp (see the description of the patent for the invention RU 2334328, H02G 7/00; published: September 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 of this tension clamp can be attributed to the complexity of the design, which increases the complexity in the assembly and disassembly of injection molds, which entails an increase in costs and cost in the manufacture of such clamps. The tension clamp does not have a fixing fixture, a coaxial line of the main tensile force, which relieves stress from the aluminum housing of the tension clamp.

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 disadvantage of this technical solution is the multi-operation, the complexity in the assembly of the tension clamp. Difficulty in manufacturing tooling, as well as in the assembly and disassembly of injection molds. In accordance with STO 56947007-29.120.10.061-2010 (STO FSK) “Tension fittings for high-voltage lines. Technical requirements ”, according to clause 7.2.2., The clamps must be with 2-3 or more dies, this condition is not observed in the case of the tension clamp. In the presence of only one clamping die.

The objective of the invention is the creation of a tension clamp for fastening aluminum, steel-aluminum bare wires with a diameter in the range of 16 ÷ 32 mm, which solves the following problems in the manufacture and operation of tension clamps overhead power lines:

- the proposed design can significantly reduce the metal consumption and the complexity of the costs associated with the manufacture of foundry equipment, and reducing the cost of the tension clamp;

- 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;

- reduce losses on magnetization reversal at least 4 times;

- the proposed design of the tension clamp provides a stable wire termination strength (at least 90% of the tensile strength of the wire).

The essence of the claimed invention is as follows.

The proposed design of the tension clamp for attaching the wires of overhead power lines, comprising a housing with a profiled groove made of non-magnetic material, aluminum or an aluminum-based alloy, U-shaped tightening bolts located in the cylindrical holes of the housing, pressure dies with a profiled groove on the bottom surface dies, also made of non-magnetic aluminum material or an aluminum-based alloy. At the same time, the tightening bolts are “hidden” to the full height in the housing, and the nut is screwed on the outside of the clamp. 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. The proposed design of the tension clamp is designed to work with wires with a diameter in the range of 16 ÷ 32 mm.

The use of non-magnetic materials in the manufacture of the clamp housing and dies made it possible to escape from magnetization reversal losses and corona.

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 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, not less than 90% of the tensile strength of the wire.

A positive factor is that the magnet loss is significantly reduced due to the fact that the U-shaped bolt is “hidden” in the housing.

This is justified by the fact that in older designs in a tension clamp, (Fig. 2) a U-shaped bolt covers the pressure housing, the magnetization reversal losses increase significantly, since the field strength is inversely proportional to the square of the distance R.

In our case (Fig. 3), this distance is set by a long die, which reduces the distance, the magnetization reversal losses are reduced by at least 4 times due to the reduction of the square of the distance.

In Russian standards, it is not justified to use bolt tension clamps on wires with a cross section of more than 240 mm ² , whereas bolt clamps up to 600 mm ² are widely used in the world. The proposed new design of the tension clamp is quite suitable for the operation of wires with a cross section up to 600 mm ² .

The installation of this clamp is carried out using hand tools (wrenches) without the use of hydraulic presses (manual mechanical), due to this, the human factor that is present when crimping tension clamps of known designs is eliminated. It should be noted that a large amount of equipment is involved in pressure testing, which increases the number of operations and does not exclude the human factor.

The invention is illustrated in the drawing, where in FIG. 1 shows a view of the proposed tension clamp. The proposed tension clamp for attaching aluminum, steel-aluminum, bare wires to the anchor-angle supports of the overhead power line, consists of a housing 1 with a profiled groove, finger 2; tightening bolts 3 with a U-shaped clamping plate with a profiled groove on the bottom of the plate 4.

In this case, the tightening bolts with a U-shape are recessed to the entire height in the housing, 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.

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 attaching the wires of overhead power lines, is distinguished by its simplicity of design, minimal costs for mounting, assembling and disassembling the clamp, and a significant reduction in the cost of manufacturing injection equipment. The use of non-magnetic materials, aluminum or an aluminum-based alloy in the manufacture of the clamp housing, dies, the design of the tension clamp, allows to reduce the magnetization reversal losses and the crown by at least 4 times. It has stable wire termination strength, not less than 90% of the tensile strength of the wire.

Claims (1)

A tension clamp for overhead power line wires, comprising a housing with a profiled groove, pressure dies with a profiled groove on the bottom surface of the die, U-shaped tightening bolts, characterized in that the housing, the pressure dies are made of non-magnetic material, including aluminum or aluminum-based alloy, U-shaped tightening bolts “hidden” to the full height in the upper case, the length of the holes in the case for the bolts is determined by the length of the bolt plus its displacement depending on the diameter of the wire.

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