Multistage torsion puncture wire clamp and cable connection construction method applying the same

Abstract

The invention discloses a multistage torsion puncture wire clamp and a cable connection construction method applying the same, and aims to provide a multistage torsion puncture wire clamp and a cableconnection construction method applying the same, which can connect and splice insulated wires, can ensure connection reliability of normal-temperature environment and low-temperature environment installation, effectively reduces a fault rate of a traditional puncture wire clamp, brings convenience to a distribution network and improves safe reliability. The multistage torsion puncture wire clampincludes an insulating upper shell, an insulating lower shell and a connecting screw connecting the insulating upper shell and the insulating lower shell, the upper end of the connecting screw is provided with a moment nut assembly in threaded connection, the moment nut assembly includes an upper moment nut, a middle moment nut and a lower moment nut distributed in sequence from top to bottom, theuncapping torque of the middle moment nut is larger than that of the upper moment nut, and the uncapping torque of the lower moment nut is larger than that of the middle moment nut.

Description

technical field [0001] The invention relates to the field of power cable connection, in particular to a multi-stage torsion puncture clamp and a cable connection construction method using the puncture clamp. Background technique [0002] The application of piercing clamps brings convenience and speed to the construction, operation and maintenance, and maintenance of overhead insulated conductors; but at the same time, it also brings overheating defects or even failures to the main line of the distribution network. The use of piercing clips has been adjusted from the original use of the whole line to the use of branch lines only, so as to reduce the failure rate. So where are the defects of the puncture clip? [0003] First of all, let us understand the working method of the piercing clamp. The insulation piercing clamp uses the torque of the torque nut to squeeze the insulating upper shell and the insulating lower shell, and pushes the piercing blade of the insulating upper...

AI Technical Summary

Problems solved by technology

[0012] The temperature of the actual construction environment of the puncture wire clip is high or low, and the puncture wire clip installed in summer can almost meet the requirements; and when the puncture wire clip is constructed in a low-temperature construction environment in winter, due to the low temperature, the outer layer of the insulated wire is insulated. The skin will become very hard, and the hardness of the insulating layer will reach the highest point. The increase in the hardness of the insulating layer will increase the extrusion force between the needle and the insulating layer, but the uncapping torque will remain unchanged (unified and constant during design and manufacture), then The contact force between the puncture blade and the wire contact point will inevitably decrease {cap removal torque (→constant)=extrusion force (↑increase)+contact force (↓decrease)}; The installation process of the wire clip will lead to a decrease in the contact force of the wire clip. The smaller the contact force is, the less the contact force will cause the needle to penetrate the wire in place, resulting in an increase in the contact resistance of the connection point. The larger the resistance, the easier it is to heat up, which poses a safety hazard.

[0013] To sum up, we can find that the main reason for the overheating and failure of the piercing wire clip is that the unreasonable setting of the uncapping torque is not considered due to the temperature change of the external environment during on-site construction.

The puncture clips installed in summer can almost meet the requirements, and the puncture clips installed in winter are prone to failure due to improper puncture

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