Oversized-section hollow corrugated split conductor

Abstract

The invention discloses an oversized-section hollow corrugated split conductor, which is of a combined type hollow segmentation conductor structure. The center of the conductor is combined by multiple layers of conductor single-line layers; conductor strand block layers integrated by a plurality of corrugated conductor strand blocks are arranged out of the conductor single-line layers; insulated crepe paper is arranged between the conductor strand block layers and the self-supporting external conductor single-line layers. The Z-shaped or corrugated conductor single lines are of a stable self-supporting structure, no gaps are formed between the conductor single lines, and therefore, requirements on tighter connection between the conductor single lines can be met without compression. Strength is guaranteed by the hollow self-supporting structure, a metal spiral pipe, a drawing copper pipe or a supporting pipe made of plastic and the like are replaced a small gap exists between the hollow self-supporting structure and segmentation conductor strand blocks, and the flexibility of the whole conductor is not lowered. According to the hollow structure, the section of the conductor is utilized to a maximum degree, and adverse effects brought by a 'skin effect' are lowered to a larger extent.

Description

[0001] technical field [0002] The invention relates to the field of cable conductors, in particular to a hollow corrugated segmented conductor with a super large cross-section. Background technique [0003] 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 cro...

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Problems solved by technology

But for a larger cross-section, since the fan-shaped height and fan-shaped width are greater than 2 times 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 expressed by the penetration depth ), 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.

[0007] In order to increase the conductor cross-section, an improvement in the prior art is to adopt a hollow segmented conductor structure, including a supported spiral tube, and twist four-, five-, six-, and seven-split corrugated conductor strands outside the supported spiral tube In order to ensure a certain strength, the helical tube supported by the hollow segmented conductor of this structure often uses a metal helical tube (such as a stainless steel helical tube, a bronze helical tube, etc.), and different metal materials will increase line loss and cause uneven electric field

Even if the same material is used, there will be a gap between the spiral tube and the divided conductor strands, and poor contact will cause large heating resistance

However, copper tubes made of drawn tubes or plastics have low softness, which will reduce the softness of the entire conductor.

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