RU2558386C2 - Spiral connecting clamp for wires with composite core - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: spiral connecting clamp consists of a protecting clamp 3, the conducting lay 4 winded on the branches 5, 6 of strands of spiral power wires which in turn are winded on the composite core 2. The branches 5, 6, and also the branches of the conducting lay 4 and the protecting clamp 3 are winded with a variable step and with the angle of lead α of spiral power wires, counted from the cross section of the clamp, perpendicular to the longitudinal axis x of the clamp, and varying according to the law α(x) = α₀[l+c_α(x/l)^k], where α₀ and c_α - design parameters of the clamp determined by its intended use, working load and physico-mechanical characteristics of the wire or the composite core, l - the working length of the clamp, while the parameter k pre-determining change of the angle of lead of wire spirals along the clamp length varies within k = 0.2÷3.0. The internal surface of branches 5, 6 is coated by abrasive layer with the size of grains 0.05÷0.5 mm, and the composite core 1 of wire or the core and the wire - with polymeric or polymeric and ceramic coating with the thickness 0.5÷1.5 mm. The strand of spiral wires is made from the material with the physico-mechanical characteristics close to physico-mechanical characteristics of material of the core and of the wire 1 itself or its composite core 2.

EFFECT: high operational reliability of the clamp which can be successfully used in overhead power transmission lines with composite wires and composite cores.

3 cl, 4 dwg

Description

The invention relates to the field of electric power industry, in particular to spiral connecting clamps for wires with a composite core, or simply for composite cores of overhead power lines.

Known electrical connector for splicing by crimping a steel-aluminum wire with a similar wire, containing a hollow metal sleeve of cylindrical shape, at least one clamp with a clearance inside the sleeve at a distance from its end face in the form of a cylindrical sleeve with longitudinal ribs protruding radially outward, having a cylindrical outer surface and evenly spaced around the circumference of the sleeve, the Central hole of which is designed to accommodate a steel core in it [1].

This connector relates to the traditional technique of connecting wires of overhead power lines, carried out by the method of compression. This method of connecting the wires of overhead power lines is characterized by considerable complexity because of the need to use crimping equipment, it is quite expensive in time and cost. Nowadays, connection clamps of simpler and more reliable structures, for example spiral connection clamps, are widely used.

A combined type clamp clamp is known, comprising a connector for connecting the steel part of the wires, conductive wire made in the form of spirals of aluminum wire, mounted on top of the connector and intended for connecting the aluminum part of the wires, power cable made in the form of spiral strands of steel wires, wound on top of the conductive wire, while the said connector is made in the form of a steel sleeve with a “push-button” pressed into it and released from both x ends by aluminum wire cores of wires to be connected [2].

This known clamp, characterized by acceptable operational reliability, is complicated in design due to the design of the connector in the form of a steel sleeve, which leads to a rise in the cost of the clamp manufacturing process, as well as its mounting on the line. As a result, such connecting clamps of the combined type have not found practical application in the electric power industry.

Also known is a connecting clamp for connecting wires of overhead power lines, consisting of a steel core and two or more aluminum wires, containing a connector made in the form of at least two strands of spiral wire, wound symmetrically on the core of the wire on both sides of its connection , and a conductive twist of strands of spiral wire, and the clamp is equipped with a tread-clamp designed to transmit the mechanical tension of the wire, as well as providing electrical circuit between the spirals, made in the form of at least two strands of spiral wire, glued and coated with an abrasive from the inner surface [3].

The aforementioned connection clamp is a spiral type clamp and contains structural elements (strands of spiral wires), which are also part of the proposed spiral connection clamp. However, the connection clamp in question is intended to connect only aluminum-steel wires and cannot be used to connect wires to a composite core or composite cores, since the core, connector and protector of this technical solution do not correspond to the new composite materials and devices in terms of their physical and mechanical characteristics and design .

The applicant set himself the task of developing a new design of a spiral connecting clamp for wires with a composite core or composite cores of overhead power lines, which would be characterized by high physical and mechanical characteristics, namely operational reliability, resistance to elevated temperatures, and high electric current carrying capacity. A positive technical result, which consists in ensuring the effective operation of spiral connecting clamps on overhead power lines with composite wires or wires with a composite core, is achieved due to a new set of design features of the proposed spiral connecting clamp for wires with a composite core, set forth in the following claims: “spiral connection clamp for wires with a composite core of overhead power lines, with consisting of a tread-retainer, conductive wound, wound on round or trapezoidal spiral wires glued to each other in cross-sectional shape or rods of composite, forming two or more spiral power strands, both branches of which are wound on the connected ends of wires or composite cores of wires with with a variable pitch and elevation angle α of the spiral wires counted from the cross section of the clamp perpendicular to the longitudinal axis x of the clamp and changing according to the following law: α (x) = α ₀ [1 + c _α (x / l) ^k ], where e l is the working length of the clamp, α ₀ and with _α are the design parameters of the clamp, determined by its purpose, work load and physico-mechanical characteristics of the wire or composite core, the parameter k, which determines the change in the angle of elevation of the spiral wires along the length of the clamp, varies within k = 0.2 ÷ 3.0, moreover, the strands of spiral wires are made of a material whose physical and mechanical characteristics are equivalent to the physical and mechanical characteristics of the material of the wires or their composite cores, and the inner surface of the spiral nanowires of said strands coated with a layer of abrasive grains with size selected in the range 0.05 ÷ 0.5 mm; the core of the wire or core made of composite material and the core have a polymer or polymer-ceramic coating, the thickness of which is 0.5 ÷ 1.5 mm; the variable pitch and the elevation angle of the turns of the conductive winding and the tread-clamp change according to the following law: α (x) = α ₀ [1 + s _a (x / l) ^k ], where l is the working length of the clamp, α ₀ and with _α - design parameters of the clamp, determined by its purpose, workload and physico-mechanical characteristics of the wire or composite core, parameter k, which determines the change in the angle of elevation of the spiral wires along the length of the clamp, varies between k = 0.2 ÷ 3.0.

The invention is illustrated by drawings, where figure 1 shows a General view of a spiral connecting clamp made in accordance with the present invention, a view perpendicular to the wires of an overhead power line; figure 2 separately shows the power spiral strands of the clamp in figure 1; figure 3 separately shows the conductive core of the clamp in figure 1; figure 4 separately shows the tread-clamp retainer in figure 1.

The inventive spiral connecting clamp for wires 1 with a composite core 2 overhead power lines consists of a tread-retainer 3, conductive coil 4, wound on two or more strands of spiral power wires. Branches 5, 6 strands of spiral power wires are wound onto a composite core 2. Spiral power wires of branches 5, 6 strands can be made round or trapezoidal and wound onto the connected ends of wires 1 or composite cores 2 of wires 1 with a variable pitch and angle of elevation α spiral power wires measured from the cross section of the clamp perpendicular to the longitudinal axis x of the clamp and changing according to the following law: α (x) = a ₀ [1 + c _α (x / l) ^k ], where α ₀ and c _α are design parameters clamps defined by its purpose reduction, working load, and physicomechanical characteristics of the wire or composite core, l is the working length of the clamp, the parameter k, which determines the change in the angle of elevation of wire spirals along the length of the clamp, varies within k = 0.2 ÷ 3.0.

The inner surface of branches 5, 6 of the spiral power wires of the strands is covered with a layer of abrasive with a precisely selected grain size in the range of 0.05 ÷ 0.5 mm, and the composite core 2 of wire 1 or composite core 2 and wire 1 with a polymer or polymer-ceramic coating, whose thickness is 0.5 ÷ 1.5 mm.

A strand of spiral wires is made of a material having physical and mechanical characteristics close to the physical and mechanical characteristics of the core material and the wire itself or its composite core.

Alternatively, the variable pitch and the angle of elevation of the turns of the conductive wire 4 and the tread-clamp 3 can also be changed according to the following law: α (x) = α ₀ [1 + c _α (x / l) ^k ], where l is the working length of the clamp , α ₀ and with _α - design parameters of the clamp, determined by its purpose, workload and physico-mechanical characteristics of the wire or composite core, parameter k, which determines the change in the angle of elevation of the spiral wires along the length of the clamp, varies within k = 0.2 ÷ 3 , 0.

The clamp is mounted by sequential left or right winding of branches 5, 6 of strands of spiral power wires on wire 1 or composite core 2 on both sides of their connection, and then by winding strands of conductive wire 4 and tread-lock 3 on spiral power wires.

The proposed spiral connecting clamp for wires with a composite core of overhead power lines due to the implementation of spiral power wires from a material similar in characteristics to the characteristics of composite materials from which wires with a composite core are made, winding spiral power wires, as well as turns of conductive winding and tread latch with a variable pitch and angle of elevation according to a precisely calculated mathematical law and other design features Xia high operational reliability and can be successfully used on overhead power lines of composite wires and the composite core.

Information sources

[1] Description of the invention to patent No. 5997355 “Electrical connector”, H01R 5/10 H02G 15/08, claimed 12.09.74, published 16.02.78.

[2] Description of the invention to patent No. 2272343 "Combination clamp connection type", H02R 1/10, published March 20, 2006.

[3] Application for the invention No. 96116241 "Connecting clamp", H01R 4/10, H02G 1/14, claimed 06.08.1996, published 10.11.1998.

[4] Description of the invention to copyright certificate No. 976820 “Connection clamp”, H01R 4/08, H01R 4/62, claimed 06/18/1979, published 11/15/1984.

[5] US Patent No. 3125630, 174-94, publication date 1964

[6] US Patent No. 3052750, 174-94, publication date 1962

Claims (3)

1. A spiral connecting clamp for wires with a composite core of overhead power lines, consisting of a tread-retainer and a conductive winding, wound on round or trapezoidal spiral wires glued to each other in cross-sectional shape or composite rods, forming two or more spiral power strands , both branches of which are wound on the connected ends of wires or composite cores of wires with a variable pitch and angle of elevation α of spiral wires, counted from the cross section clamp, perpendicular to the longitudinal axis x of the clamp, and changing according to the following law: α (x) = α ₀ [1 + c _α (x / l) ^k ], where l is the working length of the clamp, α ₀ and with _α are the design parameters clamp, determined by its purpose, workload and physico-mechanical characteristics of the wire or composite core, the parameter k, which determines the change in the angle of elevation α of the spiral wires along the length of the clamp, varies between k = 0.2 ÷ 3.0, and the strands of spiral wires are made from a material whose physical and mechanical characteristics are equivalent to physical and mechanical the characteristics of the material of the wires or their composite cores, and the inner surface of the spiral wires of the said strands is covered with a layer of abrasive with a grain size selected in the range of 0.05 ÷ 0.5 mm. 2. The clamp according to claim 1, in which the core of the wire or core and wire made of composite material have a polymer or polymer-ceramic coating, the thickness of which is 0.5 ÷ 1.5 mm. 3. The clamp according to claim 1, in which the variable pitch and the angle of elevation of the turns of the conductive wire and the tread-clamp change according to the following law: α (x) = α ₀ [1 + c _α (x / l) ^k ], where l - clamp working length, α ₀ and c _α are the design parameters of the clamp, determined by its purpose, work load and physicomechanical characteristics of the wire or composite core, parameter k, which determines the change in the angle of elevation of spiral wires along the length of the clamp, varies within k = 0, 2 ÷ 3.0.

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