CN208538537U - A kind of large capacity high reliability medium-and-high voltage fire - Google Patents

Abstract

The utility model relates to a kind of large capacity high reliability medium-and-high voltage fires, belong to electrical equipment technical field.A kind of large capacity high reliability medium-and-high voltage fire, it from inside to outside successively include cable core, ceramic fibre strip, dustless mineral wool rope filled layer, steel-tape armouring layer and high fire-retardance sheath, cable core includes five mutually twisted conductors, conductor includes four mutually twisted core wires, the outer surface of core wire is enclosed with crosslinked polyetylene insulated layer, the outer surface of conductor is enclosed with refractory inorganic short fiber layers, and the gap between core wire is filled with the first polycrystalline alumina fiber filled layer.The large capacity high reliability medium-and-high voltage fire capacity of the utility model is big and passes through the common protection of ceramic fibre strip, dustless mineral wool rope filled layer, steel-tape armouring layer and high fire-retardance sheath; when there is fire; the insulating layer for reaching core wire only softens; the effect of oxygenolysis is not generated, guarantees that cable can work normally at the appointed time when fire.

Description

A kind of large capacity high reliability medium-and-high voltage fire

Technical field

The utility model relates to a kind of large capacity high reliability medium-and-high voltage fires, belong to electrical equipment technical field.

Background technique

The development process of China's fire-resisting cable is rather tortuous, just there is arguement since noun, design and relief department by this Class product is named as " fireproof cable ", and manufacturing sector is then named as " fire-resisting cable ", and the complete term of IEC standard should be " in fire The cable of route integrality is burnt and required to keep under the conditions of flame ".Such noun is too long, over time " fire-resisting cable " at Term accustomed to using, but " fire resisting " and " fire prevention " battle are unfinished so far.Regardless of word, when about flame regulation, burning Between and route is completely equal requires, be only the substantive issue of fire-resisting cable, the simulation test of limitation only relatively, really occurs Any cable can guarantee safe operation when fire, need with more realistic test method.

High voltage, large capacity and high reliability are the directions of current power cable technology development.There are many electric wire electricity in foreign countries Cable manufacturing enterprise proposes to study crosslinked polyetylene insulated high pressure (6kV or more) fireproof power cable, domestic such as Hebei Renqiu Cable, Li Hua group of Shanghai Walsin, Guilin international cable and cable isoelectric line cable enterprise of rattan storehouse China indicate friendship on the net Join polyethylene insulation high pressure fireproof power cable, but there was only 1kV and following fire-resisting cable kind through knowing.

Presently used fire-resisting cable voltage class is all in 1kV and hereinafter, there are two types of its forms: the first is using conductor Upper wrapped mica tape flame retardant coating, in kindling, insulating layer continues to keep under high temperature (750~1000 DEG C) after burning using mica tape 90 minutes insulation performances can continue to remain powered on 90 minutes or more after realizing that fire occurs, and evacuate convenient for personnel, property；Second Kind is using copper core copper sheath magnesium oxide insulating cable, which uses mineral oxide magnesium, in kindling, magnesium oxide insulated It will not be burned out.

The crosslinked polyetylene insulated high voltage flame resistant cable of 6~35kV determines its by the electric parameter that it runs under high pressure Structure will manufacture high voltage flame resistant cable, cannot take the mode of wrapped fire-resistant isinglass belt on conductor, and copper core copper can not be taken to protect Cover magnesium oxide insulated form.

Utility model content

The technical problems to be solved in the utility model is, in view of the shortcomings of the prior art, proposing in a kind of capacity high reliability High voltage flame resistant cable.

The technical solution that the utility model proposes to solve above-mentioned technical problem is: a kind of large capacity high reliability mesohigh Fire-resisting cable successively includes cable core, ceramic fibre strip, dustless mineral wool rope filled layer, steel-tape armouring layer and high fire-retardance from inside to outside Sheath, cable core include five mutually twisted conductors, and conductor includes four mutually twisted core wires, and the outer surface of core wire is enclosed with Crosslinked polyetylene insulated layer, the outer surface of conductor are enclosed with refractory inorganic short fiber layers, and the gap between core wire is filled with first Polycrystalline alumina fiber filled layer.

The improvement of above-mentioned technical proposal is: the gap between conductor is filled with the second polycrystalline alumina fiber filled layer.

The improvement of above-mentioned technical proposal is: the crosslinked polyetylene insulated layer of the outer surface of core wire package with a thickness of 300- 950μm。

The improvement of above-mentioned technical proposal is: the refractory inorganic short fiber layers of the outer surface of conductor package with a thickness of 0.1- 1mm。

The improvement of above-mentioned technical proposal is: ceramic fibre strip with a thickness of 0.1-2mm.

The improvement of above-mentioned technical proposal is: refractory inorganic short fiber layers are polycrystalline alumina fiber.

The improvement of above-mentioned technical proposal is: refractory inorganic short fiber layers are polycrystalline mullite fibre.

The improvement of above-mentioned technical proposal is: high fire-retardance sheath is the corrosion-resistant mud polyolefin sheath layer of fire-retardant Halogen.

The beneficial effect of the utility model by adopting the above technical scheme is:

(1) cable core of the large capacity high reliability medium-and-high voltage fire of the utility model includes five and mutually twisted leads Body, conductor include four mutually twisted core wires, and the outer surface of core wire is enclosed with crosslinked polyetylene insulated layer, the outer surface of conductor Refractory inorganic short fiber layers are enclosed with, the gap between core wire is filled with the first polycrystalline alumina fiber filled layer, passes through five Core wire made from conductor ensure that the capacity of cable, and pass through crosslinked polyetylene insulated layer, refractory inorganic short fiber layers and The cooperation of one polycrystalline alumina fiber filled layer, plays excellent insulation performance, ensure that the reliability of cable, relative to biography System cable, reliability promote 50 or more percent；

(2) the large capacity high reliability medium-and-high voltage fire of the utility model passes through ceramic fibre strip, dustless mineral wool rope The common protection of filled layer, steel-tape armouring layer and high fire-retardance sheath, when there is fire, the high temperature that 750~1000 DEG C of Exterior cable Can be reduced to by passing to cable core by 250~350 DEG C, while being obstructed the oxygen in air and cannot be invaded insulating layer, to reach core wire Insulating layer only softens (crosslinked polyethylene will not melt), does not generate the effect of oxygenolysis, guarantees that cable is in regulation when fire It is interior to work normally；

(3) gap between the core wire of the large capacity high reliability medium-and-high voltage fire of the utility model is filled with first Polycrystalline alumina fiber filled layer, the gap between conductor are filled with the second polycrystalline alumina fiber filled layer, such material exists It will not be hardened, become fragile under high temperature, still be able to maintain good flexibility and elasticity, therefore cable flexible relative, good bending property；

(4) outer surface of the conductor of the large capacity high reliability medium-and-high voltage fire of the utility model be enclosed with fire resisting without Machine short fiber layers, refractory inorganic short fiber layers are polycrystalline alumina fiber or polycrystalline mullite fibre, they can be long-term 1320~1600 DEG C of heatproof, substantially increase the fire resistance of cable.

Detailed description of the invention

The utility model is described in further detail with reference to the accompanying drawing:

Fig. 1 is the structural schematic diagram of the utility model embodiment large capacity high reliability medium-and-high voltage fire；

Fig. 2 is the structural schematic diagram of the conductor of the utility model embodiment large capacity high reliability medium-and-high voltage fire；

Wherein: 1- high fire-retardance sheath, 2- steel-tape armouring layer, the dustless mineral wool rope filled layer of 3-, 4- ceramic fibre strip, 5- second Polycrystalline alumina fiber filled layer, 6- cable core, 7- conductor, 8- refractory inorganic short fiber layers, the first polycrystalline alumina fiber of 9- are filled out Fill layer, 10- core wire, the crosslinked polyetylene insulated layer of 11-.

Specific embodiment

Embodiment

The large capacity high reliability medium-and-high voltage fire of the present embodiment successively includes from inside to outside as illustrated in fig. 1 and 2 Cable core 6, ceramic fibre strip 4, dustless mineral wool rope filled layer 3,2 layers of steel-tape armouring and high fire-retardance sheath 1, cable core 6 include five phases Mutually twisted conductor 7, conductor 7 include four mutually twisted core wires 10, and it is exhausted that the outer surface of core wire 10 is enclosed with crosslinked polyethylene Edge layer 11, the outer surface of conductor 7 are enclosed with refractory inorganic short fiber layers 8, and the gap between core wire 10 is filled with the first polycrystalline oxygen Change aluminum fiber filled layer 9.

Gap between the conductor 7 of the large capacity high reliability medium-and-high voltage fire of the present embodiment is filled with the second polycrystalline Alumina fibre filled layer 5.Core wire 10 outer surface package crosslinked polyetylene insulated layer 11 with a thickness of 300-950 μm.It leads Body 7 outer surface package refractory inorganic short fiber layers 8 with a thickness of 0.1-1mm.Ceramic fibre strip 4 with a thickness of 0.1-2mm. Refractory inorganic short fiber layers 8 are polycrystalline alumina fiber or polycrystalline mullite fibre.High fire-retardance sheath 1 is fire-retardant Halogen corrosion resistant Lose mud polyolefin sheath layer.

Wherein the first polycrystalline alumina fiber filled layer 9 and the second polycrystalline alumina fiber filled layer 5 are contained using aluminium oxide The polycrystalline alumina fiber (AL2O32SiO22H2O) of amount >=95%, such material will not be hardened at high temperature, become fragile, still It is able to maintain good flexibility and elasticity, therefore cable flexible relative, good bending property.

Wherein refractory inorganic staple fiber 8, the mainly polycrystalline alumina fiber (AL2O3 of alumina content >=95% 2SiO22H2O) or the polycrystalline mullite fibre of aluminium oxide and total silica content >=99%, they can long-term heatproof 1320~1600 DEG C.

The cable core of the large capacity high reliability medium-and-high voltage fire of the present embodiment includes five mutually twisted conductors, is led Body includes four mutually twisted core wires, and the outer surface of core wire is enclosed with crosslinked polyetylene insulated layer, the outer surface package of conductor There are refractory inorganic short fiber layers, the gap between core wire is filled with the first polycrystalline alumina fiber filled layer, passes through five conductors Core wire obtained ensure that the capacity of cable, and pass through crosslinked polyetylene insulated layer, refractory inorganic short fiber layers and more than first The cooperation of crystal alumina fiber filled layer, plays excellent insulation performance, ensure that the reliability of cable, relative to traditional electricity Cable, reliability promote 50 or more percent.

The large capacity high reliability medium-and-high voltage fire of the present embodiment is filled by ceramic fibre strip, dustless mineral wool rope The common protection of layer, steel-tape armouring layer and high fire-retardance sheath, when there is fire, the high temperature that 750~1000 DEG C of Exterior cable is passed to Cable core can be reduced to 250~350 DEG C, while obstructing the oxygen in air and cannot invade insulating layer, to reach the insulation of core wire Layer only softening (crosslinked polyethylene will not melt), does not generate the effect of oxygenolysis, guarantees that cable is at the appointed time when fire It can work normally.

Gap between the core wire of the large capacity high reliability medium-and-high voltage fire of the present embodiment is filled with the first polycrystalline Alumina fibre filled layer, the gap between conductor are filled with the second polycrystalline alumina fiber filled layer, such material is in high temperature Under will not be hardened, become fragile, be still able to maintain good flexibility and elasticity, therefore cable flexible relative, good bending property.

It is short that the outer surface of the conductor of the large capacity high reliability medium-and-high voltage fire of the present embodiment is enclosed with refractory inorganic Fibrous layer, refractory inorganic short fiber layers are polycrystalline alumina fiber or polycrystalline mullite fibre, they can long-term heatproof 1320~1600 DEG C, substantially increase the fire resistance of cable.

The utility model is not limited to the above embodiment.All technical solutions formed using equivalent replacement, all fall within this reality With the protection scope of novel requirement.

Claims (8)

1. a kind of large capacity high reliability medium-and-high voltage fire, it is characterised in that: from inside to outside successively include cable core, ceramics fibre Band, dustless mineral wool rope filled layer, steel-tape armouring layer and high fire-retardance sheath are tieed up, the cable core includes five mutually twisted conductors, The conductor includes four mutually twisted core wires, and the outer surface of the core wire is enclosed with crosslinked polyetylene insulated layer, described to lead The outer surface of body is enclosed with refractory inorganic short fiber layers, and the gap between the core wire is filled out filled with the first polycrystalline alumina fiber Fill layer.

2. large capacity high reliability medium-and-high voltage fire according to claim 1, it is characterised in that: between the conductor Gap be filled with the second polycrystalline alumina fiber filled layer.

3. large capacity high reliability medium-and-high voltage fire according to claim 2, it is characterised in that: outside the core wire Surface package crosslinked polyetylene insulated layer with a thickness of 300-950 μm.

4. large capacity high reliability medium-and-high voltage fire according to claim 3, it is characterised in that: outside the conductor Surface package refractory inorganic short fiber layers with a thickness of 0.1-1mm.

5. large capacity high reliability medium-and-high voltage fire according to claim 4, it is characterised in that: the ceramic fibre Band with a thickness of 0.1-2mm.

6. large capacity high reliability medium-and-high voltage fire according to claim 5, it is characterised in that: the refractory inorganic Short fiber layers are polycrystalline alumina fiber.

7. large capacity high reliability medium-and-high voltage fire according to claim 5, it is characterised in that: the refractory inorganic Short fiber layers are polycrystalline mullite fibre.

8. large capacity high reliability medium-and-high voltage fire according to claim 6 or 7, it is characterised in that: the high resistant Combustion sheath is the corrosion-resistant mud polyolefin sheath layer of fire-retardant Halogen.