CN217086221U - Waterproof and fireproof thin steel wire armored power cable - Google Patents

Abstract

The utility model discloses a waterproof and fireproof thin steel wire armored power cable, which comprises a cable core, wherein the cable core is formed by twisting a plurality of wire cores, and each wire core comprises a conductor, a phlogopite tape, a semi-conductive water blocking tape and an insulating layer; and a high-temperature-resistant porcelain silicone rubber belt, an inner sheath, a galvanized low-carbon steel wire armor layer, a non-conductive water resistance belt and an outer sheath are sequentially arranged outside the cable core. The utility model discloses waterproof, fire-resistant thin steel wire armor power cable has solved the waterproof problem of current cable and cable during operation and has caused the electric current breakdown phenomenon because of the temperature is too big, and polyvinyl chloride inner sheath has better radial water-proof effects and good fire behavior simultaneously.

Description

Waterproof and fireproof thin steel wire armored power cable

Technical Field

The utility model relates to a field is wire and cable, a waterproof, fire-resistant thin steel wire armor power cable specifically says so, is applicable to 0.6/1kV low pressure power cable.

Background

The low-voltage power cable is generally used for transmitting and distributing electric energy, is commonly used for urban underground power grids, power station outgoing lines, power supply inside working condition enterprises, transmission lines under river and sea water and the like, but natural disasters frequently occur along with environmental deterioration, water and fire are frequent in recent years, and higher requirements are provided for the waterproof and fireproof performance of the cable.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a waterproof, fire-resistant thin steel wire armoured power cable, including the cable core, the cable core is twisted by many sinle silks and forms, the sinle silks include conductor, phlogopite area, semiconduction water-blocking tape and insulating layer, and the conductor periphery is wrapped a layer of phlogopite area, and the phlogopite area is wrapped the non-conductive water-blocking tape outward, and the non-conductive water-blocking tape extrudes the insulating layer outward; the conductor is formed by pressing and twisting a plurality of copper conductors; and a high-temperature-resistant ceramic silicon rubber belt, an inner sheath, a galvanized low-carbon steel wire armor layer, a non-conductive water resistance belt and an outer sheath are sequentially arranged outside the cable core.

Preferably, the conductor adopts the 2 nd compacted and stranded circular structure required by GB/T3956-.

Preferably, the insulating layer is made of cross-linked polyethylene insulating material.

Preferably, the cross section of each wire core is fan-shaped, the number of the wire cores is three, the three wire cores are identical in shape, and the angle of the fan-shaped wire cores is 120 degrees.

Preferably, the gap formed by the contact of the three fan-shaped wire cores is filled with the alkali-free glass fiber rope.

Preferably, the inner sheath is made of polyvinyl chloride.

Preferably, the outer sheath is made of flame-retardant polyethylene sheath material.

The utility model discloses waterproof, fire-resistant thin steel wire armoured power cable is equipped with conductor, fire-resistant band layer, semiconduction water-resistant layer, insulating layer, fire-resistant filling layer, high temperature ceramic silicon rubber layer, polyvinyl chloride inner sheath layer, thin steel wire armoured layer, non-resistance water layer and polyvinyl chloride oversheath layer from inside to outside in proper order, the utility model discloses waterproof, fire-resistant thin steel wire armoured power cable, novel structure, convenient operation through add semiconduction water-resistant layer and non-resistance water layer respectively outside on-line in-core and the cable core, get into the cable core when water, the water-resistant layer is through the effect that the great expansion ratio tamped the cable gap, prevents that the cable from vertically intaking to the conducting layer has fine balanced magnetic field, eliminates the effect of external magnetic field influence. The problem of current breakdown phenomenon is caused because of the temperature is too big when having solved current cable waterproof problem and cable work, and polyvinyl chloride inner sheath has better radial water-proof effects and good fire behavior simultaneously, and this waterproof, fire-resistant thin steel wire armoured power cable can keep steady operation in complicated natural condition and the environment that has great difference in height.

Drawings

The following detailed description is to be read in connection with the accompanying drawings and the detailed description:

fig. 1 is a schematic structural view of the waterproof, fire-resistant thin steel wire armored power cable of the present invention.

Fig. 2 is a partial enlarged view of the waterproof, fire-resistant thin steel wire armored power cable of the present invention.

In the figure: 1-conductor 2-aureosite tape 3-semiconductive water-blocking tape 4-insulating layer 5-high temperature resistant ceramic silicon rubber tape 6-inner sheath 7-galvanized low carbon steel wire armor layer, 8-non-conductive water-blocking tape 9-outer sheath 10-alkali-free glass wire rope.

Detailed Description

As shown in fig. 1 and 2, the utility model discloses a waterproof, fire-resistant thin steel wire armored power cable.

Firstly, selecting materials

(1) Conductor 1: the copper conductor is formed by pressing and twisting a plurality of copper conductors, and the surfaces of the conductors are required to be round, smooth and clean and have no burrs.

(2) Insulating layer 4: the crosslinked polyethylene insulating material is extruded, a linear molecular structure is changed into a three-dimensional reticular molecular structure in a warm water crosslinking mode, a thermoplastic material is changed into a thermosetting material, the working temperature is increased from 70 ℃ to 90 ℃, and the material performance is obviously improved. The material can not be decomposed and carbonized at the temperature of 200 ℃ or below, has high chemical stability, strong environmental stress cracking resistance, high mechanical strength and good safety, has the advantages of tensile strength and wear resistance, and has a thermal life of forty years.

Compared with common thermoplastic polyethylene, the cross-linked polyethylene has improved heat deformation resistance, mechanical property, environmental stress cracking resistance, heat aging resistance, chemical stability and solvent resistance, and reduced cold flow property. The long-term working temperature of the crosslinked polyethylene insulated cable can be increased to 90 ℃, and the instantaneous short-circuit temperature can reach 250 ℃.

(3) 2, a phlogopite tape: the polyester film tape covered on the surface of the phlogopite paper layer can increase the moisture resistance of the mica tape, and has the advantages of high tensile strength, high elastic coefficient, high compressive strength, high fire resistance, good flatness, difficult layering, acid and alkali resistance, corona resistance and the like.

(4) The semiconductive water-blocking tape 3: the material compounded by the polyester fiber non-manufacturing cloth and the high water absorption material has the characteristics of strong water resistance, heat resistance and chemical stability, strong hygroscopicity and large expansion rate, the thickness of the semi-conductive water-blocking tape is 0.9-2.1 mm, the single weight index is 200-280 g/square, the expansion is more than 14mm, the expansion speed is more than 7 mm/s/min, the tensile strength is 40N/cm, the longitudinal elongation is more than 12%, the surface resistance is less than 1500 omega, the volume resistivity is less than 1 x 106 ohm, the instantaneous heat resistance temperature is 230 ℃, the long-term heat resistance temperature is 90 ℃, the water content is less than 9 percent, the current breakdown phenomenon caused by too large temperature difference during the operation of the cable can be avoided, and the effective water resistance effect can be exerted.

(5) The alkali-free glass fiber cord 10 for filling is formed by twisting alkali-free glass fibers with the alkali content of less than 0.8%, and has the characteristics of high heat resistance and insulativity, high tensile property and small elongation.

(6) The high-temperature resistant ceramic silicon rubber belt 5 has the characteristics of excellent fire resistance, flame retardance, low smoke, no toxicity and the like, residues on the surface of the belt after combustion are a layer of hard ceramic shell, and the hard shell is not melted and does not drip in the fire situation and can pass a line integrity test of heating for 90min and cooling for 15min at the temperature of 950-1000 ℃ specified in GB/T19216.21-2003.

(7) The inner sheath 6 adopts polyvinyl chloride, uses polyvinyl chloride inner sheath not only to play the effect of protection cable core, still has certain radial waterproof ability, has obvious flame retardant efficiency meetting the conflagration.

(8) Galvanized low-carbon steel wire armor layer 7: the tensile strength can be enhanced to improve the mechanical strength of the cable, the anti-corrosion capability is improved, the magnetic shielding effect is good due to high magnetic permeability, and the cable can be used at low frequency and has prolonged service life.

(9) Non-conductive water resistance tape 8: the coated water-blocking tape is formed by compounding non-manufactured cloth, a thin film and a high water-absorbing material, has certain mechanical strength, is suitable for being used in re-cabling, has good repeatability and stable quality, cannot be layered or generate dust, has high expansion pressure and high speed compared with the common water-blocking tape, and has good compatibility with other materials.

(10) Outer sheath 9: the flame-retardant polyethylene sheath material is used, polyethylene is odorless and nontoxic, the hand feeling is similar to wax, and the flame-retardant polyethylene sheath material has excellent low-temperature resistance (the lowest use temperature can reach-100 to-70 ℃), the highest temperature in normal operation is 90 ℃, the chemical stability is good, and most of acid and alkali erosion resistance (acid with oxidation property cannot be resisted). Is insoluble in common solvents at room temperature, has low water absorption and excellent electrical insulation.

Secondly, the process scheme is as follows:

1. a conductor: the conductor is round, and the conductor adopts the 2 nd pressing and twisting round structure required by GB/T3956-. Stranded conductors do not allow for full core or full strand welding. The single wires in the stranded conductor allow welding, but the distance between two adjacent joints in the same layer is not less than 300mm, and the surface is smooth and has no burrs.

2. And (3) winding a conductor: a layer of phlogopite tape is wrapped on the periphery of the conductor, and the width and the thickness of the phlogopite tape are uniform without the defects of burrs, folds, damp dirt and the like. The thickness of the semi-conductive water-blocking tape is wrapped in a single-layer left-direction overlapping wrapping mode on the phlogopite tape and is not more than 2 mm.

3. Insulation: the nominal thickness of the insulation layer is a technological requirement value, the thinnest point of the insulation layer is not less than the nominal value multiplied by 90-0.1 mm, and the insulation layer is required to have smooth surface, no old glue, no scratch and other defects. Crosslinking with warm water after extrusion.

4. Color separation of the wire core adopts color belt color separation.

5. Filling: the filling of the small-section wire cores with the small sections of 35mm2 and below is preferably alkali-free glass fiber ropes, and the filling of the small-section wire cores with the sections of 50mm2 is preferably inorganic paper ropes.

6. High-temperature resistant ceramic silicon rubber belt: the width and the thickness of the strip are uniform, the surface of the strip is smooth, smooth and uniform, has no impurities, has no folds and has no other mechanical damage, the adjacent layers are lapped in an overlapping lapping mode in opposite directions, and the lapping rate is 20% -30% of the bandwidth. The lapping cover should be uniform.

7. Inner sheath of polyvinyl chloride: the low-density polyethylene sheath material is used, and an extruding lining mode is adopted, so that the surface is required to have no obvious scratch and old glue.

8. The steel wire armor should be inseparable, and the clearance between adjacent steel wire is minimum to guarantee that the total clearance of steel wire is not more than the diameter of a steel wire for the armor. The number of steel wires for armoring in the whole cable is consistent, if the steel wires are broken due to non-short meters, welding treatment is needed, welding spots are well treated, the defects of flash, burrs, sharp protrusions and the like are avoided, the outer diameter of the steel wire at the welding spot is not larger than the original nominal outer diameter of the steel wire, the distance between two adjacent welding spots is not smaller than 1m, and the whole strand of welding is not allowed to occur.

9. Non-conductive water resistance tape: the lapping adopts a non-conductive water tape, and the minimum lapping width is not less than 10% of the tape width. The width of the belting is allowed to have deviation of-10 to +15mm on the premise that the belting meets the cover overlapping rate. The surface after wrapping should not have the phenomenon such as wrinkling, turn-ups, hourglass package, flash joint or external diameter inhomogeneous, and the joint department should be firm.

10. The extruded outer sheath has smooth, homogeneous, round and compact wire body, no depression, burnt, angular, broken hole, node, bamboo joint, roughness, air hole and other demerits, and the printed mark is correct, continuous, clear and wear resistant. The out-of-roundness of the cable should be not more than 15% (out-of-roundness of the cable ═ cable maximum outer diameter-cable minimum outer diameter)/cable maximum outer diameter × 100%).

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (7)

1. The utility model provides a waterproof, fire-resistant thin steel wire armoured power cable, includes the cable core, and the cable core is formed its characterized in that by many sinle silks transposition: the wire core comprises a conductor (1), a phlogopite tape (2), a semi-conductive water-blocking tape (3) and an insulating layer (4), wherein the periphery of the conductor (1) is wrapped with the phlogopite tape (2), the semi-conductive water-blocking tape (3) is wrapped outside the phlogopite tape (2), and the insulating layer (4) is extruded outside the semi-conductive water-blocking tape (3); the conductor (1) is formed by tightly pressing and twisting a plurality of copper conductors; and a high-temperature resistant ceramic silicon rubber belt (5), an inner sheath (6), a galvanized low-carbon steel wire armor layer (7), a non-conductive water resistance belt (8) and an outer sheath (9) are sequentially arranged outside the cable core.

2. The waterproof, fire-resistant, fine-wire armored power cable of claim 1, wherein: the conductor (1) adopts a 2 nd compacted stranded circular structure required by GB/T3956-.

3. The waterproof, fire-resistant, fine-wire armored power cable of claim 1, wherein: the insulating layer (4) is made of a cross-linked polyethylene insulating material.

4. The waterproof, fire-resistant, fine-wire armored power cable of claim 1, wherein: the section of sinle silk is fan-shaped, the quantity of sinle silk is three, and three sinle silk's shape is the same, and its fan-shaped angle is 120 degrees.

5. The waterproof, fire-resistant, fine-wire armored power cable of claim 1, wherein: and a gap formed by the contact of the three fan-shaped wire cores is filled with an alkali-free glass fiber rope (10).

6. The waterproof, fire-resistant, thin-wire-armored power cable of claim 1, wherein: the inner sheath (6) is made of polyvinyl chloride.

7. The waterproof, fire-resistant, fine-wire armored power cable of claim 1, wherein: the outer sheath (9) is made of flame-retardant polyethylene sheath material.

Images