Ultra-large-section fanlike split conductor

Abstract

The invention discloses an ultra-large-section fanlike split conductor. A conductor center is formed by integrating multiple split fanlike conductor strand blocks, and conductor single line layers are twisted outside the whole integrated split fanlike conductor strand blocks; insulating crepe paper for isolation is arranged between the integrated split fanlike conductor strand blocks and the twisted conductor single line layers. The ultra-large-section fanlike split conductor has the advantages that the production technology difficulty is lowered, the compressing coefficient is large, the compactness is high, the structure is stable, the skin effect is little, and carrying capacity is large.

Description

technical field [0001] The invention relates to the field of cable conductors, in particular to a fan-shaped segmented conductor with a super large cross-section. 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 th...

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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; secondly, power cables often require that the conductors must be compacted conductors to increase the filling factor of the conductors, reduce the outer diameter, reduce the gap between conductors, and prevent moisture from infiltrating; to make the conductors more tightly connected, Some problems caused by looseness are avoided. 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

Because of the above reasons, it is often necessary to use metal strips (such as steel strips, bronze strips, etc.) or other strips to fasten the fan-shaped conductor strands after they are assembled. However, this fastening method increases the production cost and the surface is not smooth. , also reduces the softness of the conductor, and it is easy to generate a gap between the conductor and the shielding layer when the conductor is bent, which reduces the insulation performance, and the metal strip can also cause uneven electric field and increase line loss

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