Water-resistant super-large section combined segmental conductor

Abstract

The invention provides a water-resistant super-large section combined segmental conductor. The center of the conductor is formed by multiple segmental sector conductor strand block sets which are identical in the size and the section shape, and a sector strand block water-resistant layer is arranged outside each sector conductor strand block. Water-resistant ropes are filled in the center gaps behind the multiple sector conductor strand block sets. Multiple segmental corrugated conductor strand blocks are arranged outside the sector strand block water-resistant layer in an integration way. Finally a water-resistant layer is arranged outside the segmental corrugated conductor strand blocks. The section of the segmental corrugated conductor strand blocks is greater than that of the segmental sector conductor strand blocks for 3%-8%. The water-resistant layers are arranged outside the sector strand block conductors, and the water-resistant layer is arranged inside and outside the strand block conductors and the gaps of the sets so that the whole conductor is protected by the water-resistant layer, and the conductor is enabled to have high water resistance function without influencing the electrical performance of the cable or even the abnormal disconnection accident due to oxidation and corrosion of the conductor caused by water penetration.

Description

technical field [0001] The invention relates to the field of cable conductors, in particular to a water-blocking super large cross-section combined split conductor. Background technique [0002] With the rapid growth of China's economy and the further acceleration of industrialization and urbanization, the requirements for the construction of infrastructure such as urban power grids are increasing. Cities in developed regions and provincial capitals have required the use of underground power cables to transmit electric energy in urban centers. At the same time, electricity is the premise and foundation of the development of the national economy. With the rapid development of the national economy, the demand for electricity has increased sharply, the capacity of the grid has increased sharply, and the power of motors has increased. ) transmission direction development. In order to increase the carrying capacity of the cable, the method of increasing the cross section of the ...

AI Technical Summary

Problems solved by technology

But for a larger cross-section, since the sector height and sector width are greater than twice the penetration depth (the skin effect is formed due to the attenuation of the field quantity inside the conductor, the attenuation speed of the field quantity in the conductor can be determined by the penetration depth d representation), so the segmentation effect is no longer obvious

At the same time, there are many problems and disadvantages in the production process of this method of dividing the conductor: first, when the section of the fan-shaped conductor strand is too large, the difficulty of the production process increases, the characteristic requirements of the tooling mold and equipment, and the stability of the conductor structure and bending characteristics cannot meet the requirements; increase the number of splits to reduce the section of the fan-shaped conductor strands, the fan angle is too small, and the processing difficulty also increases; second, the power cable often requires that the conductor must be a compact conductor to increase the fill factor of the wire. Reduce the outer diameter, reduce the gap between conductors, prevent moisture from infiltrating; make the connection between conductors tighter, and avoid some problems caused by loosening. The contact surface is enlarged, the conductivity is enhanced, and the heating resistance caused by poor contact is avoided; while the fan-shaped conductor strands are fan-shaped compactly pressed, and the shape of each layer is different. When the cross-section of the strands is too large, the difficulty of compacting increases.

The third is that the insulating paper between the fan-shaped conductor strands cannot withstand deformation. During processing, the conductor must be pre-twisted and then wrapped with paper to become a pre-twisted insulating wire, and then assembled

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; , the insulation layer will produce "water branches", which will accelerate the electrical aging of the cable, cause cable breakdown accidents, and reduce the service life of the cable

Images