RU2645745C1 - Linear twist grip - Google Patents

Abstract

FIELD: power engineering; electricity.

SUBSTANCE: invention relates to the field of electric power industry, namely to linear spiral clamps intended for fastening, connecting and repairing uninsulated or insulated wires of overhead transmission lines. Linear spiral clamp for fixing, connecting and repairing uninsulated or insulated wires of overhead power lines is made of structural elements in the form of wire spirals, which wind on uninsulated or insulated wires from their outer surface, for example, in several layers. Wire spirals are made of non-magnetic austenitic steel with the following characteristics: non-magnetic steel has a relative magnetic permeability of not more than 10, and its temporary tensile strength is not less than 900 MPa.

EFFECT: performance of linear spiral clamps made of non-magnetic austenitic steel with the above characteristics makes it possible to significantly reduce power losses for magnetization reversal in uninsulated and insulated wires of overhead transmission lines.

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Description

The invention relates to the field of electric power, in particular to linear spiral clamps intended for fastening, connecting and repairing uninsulated or insulated wires of overhead power lines.

The practice of the widespread use of linear spiral fittings on overhead power lines revealed its significant drawback in terms of a sharp increase in the magnetization reversal power losses when it is fixed on uninsulated and insulated wire lines, which also leads to overheating and a decrease in their mechanical strength, and ultimately to a decrease bandwidth overhead power lines.

The authors set themselves the task of solving the problem of a significant reduction in the magnetization reversal power loss in uninsulated and insulated wires of overhead power lines with spiral tension, connecting and repair clamps. This positive technical result was achieved due to the combination of essential features of a linear spiral clamp, presented in the following claims: “linear spiral clamp for fastening, connecting and repairing uninsulated or insulated wires of overhead power lines, containing structural elements in the form of wire spirals covering uninsulated or insulated wire from the outer surface with one or more layers, with at least one layer above the aforementioned wire spirals are made of non-magnetic austenitic steel with a relative magnetic permeability of not more than 10, a temporary tensile strength of not less than 900 MPa.

The inventive linear spiral clamp (tension, connecting, repair or protector) for fastening, connecting and repairing uninsulated or insulated wires of overhead power lines is made of structural elements in the form of wire spirals that are wound on uninsulated or insulated wires from their outer surface, for example, several layers. Wire spirals are made of non-magnetic austenitic steel with certain characteristics, namely: non-magnetic steel has a relative magnetic permeability of not more than 10, and its temporary tensile strength is not less than 900 MPa. The implementation of structural elements (wire spirals) of linear spiral clamps of non-magnetic austenitic class steel with the above characteristics can significantly reduce the magnetization reversal power loss in uninsulated and insulated wires of overhead power lines, which virtually eliminates overheating of the wires during operation and ultimately helps increase throughput overhead power lines. The applicant conducted tests to determine the mechanical strength of the termination of the wire in the clamp and magnetization reversal, the results of which are presented in the following examples of implementation of the present invention.

Example 1

Permeability

Relative magnetic permeability of austenitic steels

μ / μ ₀ ≤10

μ = (1.26 ÷ 8.8) 10 ^-6 GN / m - austenitic steels

μ ₀ = 4π 10 ^-7

Relative magnetic permeability of ferritic steels μ / μ ₀ ≥100.

An example of reducing power losses and lowering the heating temperature of a wire when using spiral clamps made of austenitic and ferritic steels is given in the table.

Power losses when using a ferrite steel tension clamp are 2 times higher than the losses in the wire without clamps and with austenitic steel clamps

Example 2

The seal termination strength of a wire with a temporary tensile strength of less than 900 MPa is 0.85 of the tensile strength of the wire.

The termination strength of a tension clamp made of wire with a temporary tensile strength of more than 900 MPa is 0.98 of the breaking strength of the wire.

Information sources

[one]. Description of the invention to patent No. 2315408 "Spiral tension clamp", H02G 7/02, claimed August 30, 2006, published January 20, 2008.

[2]. Description of the invention to patent No. 2291535 "Spiral tension clamp", H02G 7/02, claimed 12.10.2005, published 10.01.2007.

[3]. Description of the invention to patent No. 2272346 "Spiral tension clamp", H02G 7/02, claimed July 29, 2004, published March 20, 2006.

[four]. The monthly production and technical journal "Electric Stations", No. 1, 1998, pp. 3-5, fig. 2.

[5]. USSR copyright certificate No. 1014083, H02G 7/02, dated 11.08.81

[6]. Description of the invention to patent No. 2035104 "Method for the manufacture of spiral-type tension clamps", H02G 1/04, published 05/10/95.

[7]. US patent No. 4791237, "Tension clamp", published 12/13/1988

[8]. French Patent No. 2215731, published 08/23/1974

[9]. Description of the invention to patent No. 2558386, H01R 4/10, claimed on 10.25.2013, published on 08/10/2015.

[10]. Description of the invention to patent No. 2272343, “Combination clamp of combined type”, H01R 4/10, H02G 1/14, claimed 03.08.2004, published 03.20.2006.

[eleven]. US patent No. 3125630, "Connection clamp", published 03/17/1964

Claims (1)

A linear spiral clamp for fastening, connecting and repairing uninsulated or insulated wires of overhead power lines, containing structural elements in the form of wire spirals covering an uninsulated or insulated wire with an outer surface in one or more layers, with at least one layer of the above-mentioned wire spirals non-magnetic austenitic steel with a relative magnetic permeability of not more than 10, a temporary tensile strength of not less than 900 MPa