Environment-friendly water blocking conductor for power cable

Abstract

The invention discloses an environment-friendly water blocking conductor for a power cable. The water blocking conductor comprises a single wire, wherein multiple layers are twisted to form the single wire, and a piece of water blocking paper is longitudinally wrapped on each layer of the single wire. One-time pressing or layer-by-layer pressing is conducted on the twisted single wire. The single wire is regularly twisted or irregularly twisted. The single wire is simply regularly twisted or compositely irregularly twisted. The single wire is twisted to form a circular guide wire twisting structure, a sector conductor structure, a shaped wire structure with shaped wires arranged on the outer layer or on multiple layers, and a divided conductor structure. The number of central guide wires of the circular guide wire twisting structure ranges from one to five. The water blocking paper is longitudinally wrapped on each layer of the single wire, in the twisting process and the subsequent machining process, even when the water blocking paper is broken, a gap between the layers of the single wire can still be fully filled with the water blocking paper, water blocking is continuous, even and reliable, water can be effectively prevented from conducting longitudinal immersing along conductors, the service life of the cable and the reliability of electric running are ensured.

Description

technical field [0001] The invention relates to the field of power cables, in particular to an environment-friendly water-blocking conductor for power cables. Background technique [0002] Moisture intrusion is often the main reason why power cables, especially medium and high voltage power cables, are damaged and their service life is affected. The way of water intrusion is mainly to invade the cable from the cable sheath and the end of the cable, causing oxidation and corrosion of the conductor, thereby affecting the electrical performance of the cable, and even abnormal disconnection accidents. [0003] The fill factor is the ratio of the actual conductor area of ​​the core to the cross-sectional area of ​​the core outline. It is a parameter to measure the conductor gap of the core. The smaller the fill factor, the larger the conductor gap and the easier it is for water to infiltrate. The conductors of power cables are divided into regular stranding and irregular str...

AI Technical Summary

Problems solved by technology

However, in order to facilitate filling and not excessively increase the conductor cross-section, the water-blocking yarn requires a smaller outer diameter, and its strength is lower. In the case of twisting, especially in the case of high-speed twisting to meet the requirements of the production schedule, the shear force generated , traction, the water-blocking yarn is easy to pull, which affects the production progress and the filling effect is poor; while the water-blocking paste and water-blocking powder are in use, the filling process is troublesome and difficult to control, and there will be uneven or missing filling. Viscous paste and dust have great pollution to the environment and operators, which also limits its use

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