What is pre-twisted wire? How to repair pre-twisted wire?

Release time:

2021-04-14

The pre-twisted wire is used for the connection fittings of overhead power conductor and power overhead optical cable terminal, suspension, joint, etc. Pre-twisted wire appeared in the United States as early as the 1940 s and 1950 s. The initial products were spiral protective lines for the protection of bare wire stress concentration positions and electric corrosion and arc burning positions. After years of development, pre-twisted wire fittings have been widely used in power transmission and distribution, optical fiber communications, electrified railways, cable television, construction, agriculture and other fields.

What is pre-twisted wire? How to repair pre-twisted wire?

Pre-stranded wire repair method

The repair process of damaged steel core aluminum conductor in 10kV line is mainly carried out in accordance with the relevant provisions of the Code for Construction and Acceptance of 35kV and below Overhead Power Line of Electrical Equipment Installation Engineering. According to the different degree of damage of the wire, the following repair processes are mainly used: No. 0 sandpaper polishing, winding repair, repair pipe repair, straight line connection pipe connection. From the point of view of the repair method, the use of 0# sand sanding and winding process to repair the wire is relatively short. However, these two methods can only cover the repair of steel-core aluminum wires with strength loss not exceeding 5% of the total tensile breaking force and cross-sectional area damage not exceeding 7% of the total cross-sectional area of the conductive part, which has considerable limitations. However, after the mixed short circuit of steel core aluminum wire occurs in reality, the damaged area of the wire is generally more than 7%. To this end, we have made statistics on the total amount of wire repair throughout the year. In the year, the number of failures with conductor damage area greater than 7% is 15, accounting for about 60% of the total number of failures. The repair of wires with a damaged area of more than 7% is mainly to repair the repair pipe and reconnect it with a straight-line connecting pipe after sawing. However, these two processes have higher requirements for tools and labor, and the construction process is relatively cumbersome, so the construction time is relatively long.

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