CN201984891U - Quakeproof power cable - Google Patents

Abstract

Earthquake-resistant power cables, including conductor, semi-conductive layer, conductor shielding layer, insulating layer, insulating shielding layer, copper tape shielding layer, elastomer filling, wrapping layer, isolation sleeve, thin round steel wire armor layer, thick round steel wire armor layer, copper conductor, isolation layer, outer sheath. It is characterized in that the conductor is wrapped with a layer of semi-conductive tape; the insulation material, filling material, isolation sheath material, and outer sheath material are all elastomeric polymers; the armor layer is armored by double-layer steel wire. The utility model has relatively large shear stiffness, bending stiffness, and damping ratio, and has obvious effects of resistance to shear force, bending moment, axial force, torque, etc., and has excellent anti-vibration and anti-vibration capabilities.

Description

Anti-seismic power cable

technical field

The utility model relates to a power cable, which is widely used in power systems with a rated voltage of 35kV and below, and belongs to the technical field of shockproof and shockproof cables.

Background technique

As the "artery vessel" of modern industrial construction - wire and cable, it has an indelible role in promoting society. There are various radiation methods of wires and cables, mainly overhead, through pipes, direct burial, and bridges. With the continuous progress of the society, people pay more attention to the urban environment, greening the urban environment and improving the quality of life. Therefore, people turn the "Skynet" overhead line into an underground pipeline transmission line to beautify the environment. Due to frequent large and small earthquakes in recent years, electrical equipment such as wires and cables will be damaged to varying degrees. The development of the national economy has also seriously affected the earthquake relief and post-earthquake reconstruction work. Therefore, it is very necessary to research and develop anti-seismic cables in order to reduce earthquake losses and improve the anti-seismic ability of transmission lines. Our company pays close attention to people's livelihood, adapts to the needs of social development, dares to challenge the peak of science and technology, and researches and develops an anti-seismic power cable. The cable has high transmission power, high safety factor, long service life, and especially has the ability of shock resistance and shock resistance.

Utility model content

The utility model provides an anti-seismic power cable. The product has the performance of resolving the internal force (shear force, bending moment, axial force, torque, etc.) or deformation (linear displacement, angular displacement) generated by the structure under the action of an earthquake. It is a cable product with shock resistance and shock resistance.

The utility model is realized through the following technical scheme: the conductor adopts the second type of copper conductor stipulated in GB/T 3956-2008; the conductor is wrapped with a layer of semi-conductive tape; the semi-conductive tape is fully dry three-layer co-extruded Conductor shielding layer, insulating layer, insulating shielding layer; the insulating shielding is overlapped and wrapped with a layer of copper tape to form a metal shielding layer; three metal shielding cores are twisted into a cable, and the gap between the cable cores is filled densely with vulcanized rubber strips; the outer core of the cable is wound A layer of reinforced non-woven fabric is wrapped to form the wrapping layer; a layer of isolation sleeve is extruded around the wrapping layer; a double-layer round steel wire armor layer is arranged outside the isolation sleeve, and the armor layer of thin round steel wire (steel wire diameter 0.8 ~ 2.5mm) Inside, the thick round steel wire (steel wire diameter 4.0~6.0mm) armor layer is outside, and there are four copper conductors of equal diameter in the outer steel wire to divide the thick round steel wire armor layer equally, and the inner and outer two armor layers are twisted in opposite directions . Two layers of reinforced non-woven fabrics are overlapped and wrapped around the armored layer to form an isolation layer, and the outer sheath of the elastic outer sheath is tightly extruded outside the isolation layer.

The beneficial effects of the utility model are: the utility model seismic power cable is designed according to the basic requirements of seismic design, introduces multiple seismic parameters, and selects cable materials that meet the performance through complex calculation and derivation, and is refined. The cable conductor is wrapped with a semi-conductive tape, which on the one hand plays a role in uniforming the electric field of the conductor, and on the other hand helps to eliminate the torsional force between the conductor and the insulation; the conductor shield and the insulation shield are made of cross-linked semi-conductive rubber, The insulation adopts ethylene-propylene rubber with good electrical insulation performance. After special treatment, the mechanical properties of ethylene-propylene rubber increase: the tensile strength before aging is ≥14N/mm ² , and the elongation at break is ≥280%. After 96h, 90℃ aging treatment , Tensile strength ≥ 12N/mm ² , elongation at break ≥ 240%, which improves the shear resistance, bending moment, axial force, torque and other effects of the insulated core. The cable is filled with vulcanized rubber strips, which acts as a shock-absorbing and damping device, and makes the stress on each point of the cable even. The isolation layer is made of polyurethane elastomer material, which reduces the elastic modulus of the cable and increases the section moment of inertia of the cable. Two layers of steel wire armor are used, the inner layer is made of thin steel wire, which makes the inner layer dense and elastic, and the outer layer is made of thick steel wire to improve the anti-pressure effect of the cable unit section. The armor layer composed of two layers in opposite directions has tensile strength. , Compression resistance, shear resistance, axial force resistance, eliminating cable deformation caused by line displacement and angular displacement. Adding four copper conductors in the outer layer increases the fault current capacity of the cable and reduces the eddy current loss of the cable to a certain extent. The outer sheath is made of polyurethane elastomer. After special processing, the mechanical properties of this material are greatly enhanced: the tensile strength before aging is ≥17N/mm ² , and the elongation at break is ≥500%. After 48h, 100℃ aging treatment, the tensile strength Strength ≥ 16N/mm ² , elongation at break ≥ 450%, play the role of shock absorption and damping, greatly increase the shear stiffness, bending stiffness, and damping ratio of the cable, and can withstand the instantaneous acceleration of 0.30g caused by the earthquake (Seismic fortification intensity is 8).

Description of drawings

Fig. 1 is a structural representation of the utility model.

In the figure: 1. Conductor, 2. Semi-conductive layer, 3. Conductor shielding layer, 4. Insulation layer, 5. Insulation shielding layer, 6. Copper tape shielding layer, 7. Elastomer filling, 8. Wrapping layer, 9 , isolation sleeve, 10, thin round steel wire armor layer, 11, thick round steel wire armor layer, 12, copper conductor, 13, isolation layer, 14, outer sheath.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and the embodiment of the 35kV earthquake-resistant power cable.

As shown in the figure: Conductor 1 is wrapped with a layer of semi-conductive tape 2; outside of semi-conductive tape 2 is a fully dry three-layer co-extruded conductor shielding layer 3, insulating layer 4, and insulating shielding layer 5; insulating shielding 5 is overlapped and wrapped A layer of copper tape forms the metal shielding layer 6; three metal shielding wire cores are twisted into a cable, and the gap between the cable cores is filled with vulcanized rubber strips 7; the cable core is wrapped with a layer of reinforced non-woven fabric to form the wrapping layer 8; Layer 8 is extruded with a layer of isolation sleeve 9; the isolation sleeve 9 is provided with a left-hand thin round steel wire (wire diameter 0.8-2.5mm) armor layer 10, and a right-hand thick round steel wire (steel wire diameter 0.8-2.5 mm) Diameter 4.0～6.0mm) armor layer 11, there are four copper conductors 12 of equal diameter in the thick round steel wire armor layer 11 to divide the thick round steel wire armor layer 11 equally. Two layers of reinforced non-woven fabrics are overlapped and wrapped around the armor layer to form an isolation layer 13, and an elastic outer sheath 14 is tightly extruded outside the isolation layer 13.

Claims (5)

1. antidetonation power cable comprises conductor, semi-conductive layer, conductor shield, insulating barrier, insulation screen, copper strips screen, elastomer-filled, lapping layer, separation sleeve, thin round steel wire armour, thick round steel wire armour, copper conductor, separator, oversheath.

2. it is characterized in that the outer wrapped one deck semi-conductive tape of conductor; Insulating material, packing material, separation sleeve material, jacket material are elastomer polymer; Armour adopts double wire armor.

3. according to right 1 described antidetonation power cable, it is characterized in that wrapped one deck semi-conductive tape on the described conductor.

4. according to right 1 described antidetonation power cable, it is characterized in that described insulating material adopts the second third rubber material, packing material adopts the rubber bar of sulfuration, and separation sleeve, oversheath are polyurethane elastomer material.

5. according to right 1 described antidetonation power cable, it is characterized in that described armour adopts double wire armor, the thin round steel wire armouring of internal layer, outer thick round steel wire armouring.

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