CN205230640U - Super high tension cable of fire -resistant high pressure - Google Patents

Abstract

The utility model belongs to the technical field of power cables, in particular to a single-core or three-core fire-resistant high-voltage ultra-high-voltage cable. A fire-resistant high-voltage and extra-high-voltage cable, including a cable insulated core, and the outside of the cable insulated core is sequentially covered with a buffer layer, an inorganic non-metallic refractory layer, an oxygen barrier layer, a metal layer, an outer sheath, and an outer semi-conductive layer. layer. Due to the multiple protection of the combination of refractory layer, oxygen barrier layer and metal layer, each layer can form an independent fire protection unit protection layer to ensure the normal power transmission of the insulated core of the cable main body and provide protection for life and property. The production method of this product is simple, with outstanding fire-resistant characteristics, mature technology, energy saving and environmental protection, and low cost. It is suitable for high-voltage and ultra-high-voltage transmission networks, especially large-capacity transmission lines for urban high-rise super-high-rise buildings and smelting plants to ensure the safety of life and property. middle.

Description

A fire-resistant high-voltage and extra-high-voltage cable

technical field

The utility model belongs to the technical field of power cables, in particular to a single-core or three-core fire-resistant high-voltage ultra-high-voltage cable.

Background technique

With the rapid development of my country's social economy, there are more and more people-intensive places such as subways, power plants, tunnels and other important engineering facilities and smart communities, large supermarkets, and high-rise buildings. In these large high-rise buildings, 10-220kV high-voltage and ultra-high-voltage XLPE insulated cables have been used. The transformer is set in the middle of the building floor, and the cable is laid in the shaft to connect with the transformer, and after the voltage is stepped down by the transformer, it supplies power to the relevant equipment. At present, there are only low-voltage fire-resistant cables, and there are no high-voltage and ultra-high-voltage fire-resistant cables of 66kV and above. In the future, with the construction of important projects and super-high-rise facilities, it is required that the project still need safe power supply within a certain period of time after the fire. Fire-resistant cables put forward higher requirements.

Utility model content

The purpose of the utility model is fundamentally to provide a single-core or three-core fire-resistant high-voltage ultra-high-voltage cable to meet the requirements of high-voltage and large-capacity power transmission.

In order to achieve the above object, the utility model adopts the following technical solutions:

A fire-resistant high-voltage and extra-high-voltage cable, including a cable insulated core, and the outside of the cable insulated core is sequentially covered with a buffer layer, an inorganic non-metallic refractory layer, an oxygen barrier layer, a metal layer, an outer sheath, and an outer semi-conductive layer. layer.

The insulated core of the cable is a single-core or three-core structure, and each insulated core of the cable is composed of a conductor, a conductor shielding layer, an insulating layer and an insulating shielding layer arranged sequentially from the inside to the outside, wherein a single core is a single As a whole, the three cores are composed of three wholes.

The buffer layer is wrapped or longitudinally wrapped on the cable insulation core, and its material is a buffer tape with semi-conductive and water-blocking functions, which is in close contact with the inorganic non-metal refractory layer and the insulation shielding layer in the cable insulation core .

The inorganic non-metal refractory layer is longitudinally wrapped or wrapped around the buffer layer, and its material is mica or ceramic cloth tape, and the outer surface is coated with a semi-conductive coating, which is in close contact with the buffer layer and the oxygen barrier layer.

The oxygen barrier layer is extruded outside the inorganic non-metal refractory layer, and its material is semi-conductive, highly flame-retardant polymer polyolefin, which is in close contact with the inorganic non-metal refractory layer and the metal layer to form a conductive whole.

The metal layer is extruded or longitudinally wrapped outside the oxygen barrier layer, and its material is copper, aluminum and its alloys. Its shape is corrugated or smooth and flat, and it is in close contact with the oxygen barrier layer and the outer sheath. The inner buffer layer, the inorganic non-metal refractory layer and the oxygen barrier layer constitute a conductor, and the four are closely connected and form a conductive whole by using semi-conductive materials.

The outer sheath is extruded outside the metal layer and made of polyvinyl chloride or polyethylene, and the outer semiconductive layer is extruded or coated on the surface of the outer sheath.

Compared with the prior art, the utility model has the following effects:

This type of cable achieves the fire protection requirements of high-voltage and extra-high-voltage cables by longitudinally wrapping or wrapping the refractory layer, extruding the oxygen barrier layer, extruding or longitudinally wrapping the metal layer on the outside of the insulated core, and due to the use of the refractory layer, oxygen barrier layer Combined with the metal layer for multiple protection, each layer can form an independent fire protection unit protection layer to ensure the normal power transmission of the insulated core of the cable main body and provide protection for life and property. The production method of this kind of product is simple, it has outstanding fire-resistant characteristics, and the process technology is mature, energy-saving and environmentally friendly, and low cost. It is suitable for high-voltage and ultra-high-voltage transmission networks, especially large-capacity power transmission in urban high-rise super high-rise buildings, smelting plants, etc. to ensure the safety of life and property. in line.

Description of drawings

Figure 1 is a schematic diagram of the cross-sectional structure of a single-core fire-resistant high-voltage and extra-high-voltage cable.

The reference signs in the figure are: 1-conductor, 2-conductor shielding layer, 3-insulation layer, 4-insulation shielding layer, 5-buffer layer, 6-inorganic non-metal refractory layer, 7-oxygen barrier layer, 8- Metal layer, 9-outer sheath, 10-outer semiconducting layer.

detailed description

Below in conjunction with accompanying drawing and example the utility model is described in detail.

A fire-resistant high-voltage and extra-high-voltage cable, as shown in Figure ¹ , is used in single-core high-voltage power cables in super high-rise buildings. From the inside to the outside, it is covered with a buffer layer 5 , an inorganic non-metal refractory layer 6 , an oxygen barrier layer 7 , a metal layer 8 , an outer sheath 9 and an outer semiconductive layer 10 . The insulated core of the cable is a single-core or three-core structure, and each insulated core of the cable is composed of a conductor 1, a conductor shielding layer 2, an insulating layer 3 and an insulating shielding layer 4 arranged sequentially from the inside to the outside; The buffer layer 5 is wrapped or longitudinally wrapped on the cable insulation core, and its material is a buffer tape with semi-conductive and water-blocking functions, which is in close contact with the inorganic non-metallic refractory layer 6 and the insulation shielding layer 4 in the cable insulation core ; The inorganic non-metal refractory layer 6 is vertically wrapped or wrapped around the buffer layer 5, and its material is mica or ceramic cloth tape, and the outer surface is coated with a semi-conductive coating, which is in close contact with the buffer layer 5 and the oxygen barrier layer 7 The oxygen barrier layer 7 is extruded outside the inorganic non-metal refractory layer 6, and its material is semi-conductive, highly flame-retardant polymer polyolefin, which is in close contact with the inorganic non-metal refractory layer 6 and the metal layer 8; The metal layer 8 is extruded or longitudinally wrapped outside the oxygen barrier layer 7, and its material is copper, aluminum and its alloys. Its shape is corrugated or smooth and flat, and it is in close contact with the oxygen barrier layer 7 and the outer sheath 9; The aforementioned outer sheath 9 is extruded on the outside of the metal layer 8 and made of polyvinyl chloride or polyethylene, and the outer semiconductive layer 10 is extruded or coated on the surface of the outer sheath 9 .

Claims (7)

1. A fire-resistant high-voltage and extra-high-voltage cable, comprising a cable insulated wire core, is characterized in that the outside of the cable insulated wire core is coated with a buffer layer (5), an inorganic non-metallic refractory layer (6), an oxygen barrier layer (7), metal layer (8), outer sheath (9) and outer semiconducting layer (10). 2. The fire-resistant high-voltage and extra-high-voltage cable according to claim 1, characterized in that, the cable insulated core is a single-core or three-core structure, and each cable insulated core is composed of conductors (1 ), conductor shielding layer (2), insulating layer (3) and insulating shielding layer (4). 3. The fire-resistant high-voltage and extra-high-voltage cable according to claim 2, characterized in that, the buffer layer (5) is wrapped or longitudinally wrapped on the cable insulation core, and its material is semi-conductive and water-blocking. The buffer tape is in close contact with the inorganic non-metal refractory layer (6) and the insulating shielding layer (4) in the cable insulating core. 4. The fire-resistant high-voltage and extra-high-voltage cable according to claim 1 or 2, characterized in that, the inorganic non-metallic fire-resistant layer (6) is wrapped longitudinally or wrapped around the buffer layer (5), and its material is mica or The ceramicized cloth tape has a semi-conductive coating on its outer surface and is in close contact with the buffer layer (5) and the oxygen barrier layer (7). 5. The fire-resistant high-voltage and extra-high-voltage cable according to claim 1 or 2, characterized in that, the oxygen barrier layer (7) is extruded outside the inorganic non-metallic fire-resistant layer (6), and its material is semi-conductive, high Flame-retardant polymer polyolefin is in close contact with the inorganic non-metal fire-resistant layer (6) and the metal layer (8). 6. The fire-resistant high-voltage and extra-high-voltage cable according to claim 1 or 2, characterized in that, the metal layer (8) is extruded or longitudinally wrapped outside the oxygen barrier layer (7), and its material is copper, aluminum and Its alloy, its shape is corrugated or smooth flat sleeve mode, is in close contact with the oxygen barrier layer (7) and the outer sheath (9). 7. The fire-resistant high-voltage and extra-high-voltage cable according to claim 1 or 2, characterized in that, the outer sheath (9) is extruded and wrapped outside the metal layer (8), and the material is polyvinyl chloride or polyethylene, and the outer sheath (9) is made of polyvinyl chloride or polyethylene. The semiconductive layer (10) is extruded or coated on the surface of the outer sheath (9).