CN221352426U - High-low temperature-resistant crosslinked polyethylene insulated medium-high voltage power cable - Google Patents
High-low temperature-resistant crosslinked polyethylene insulated medium-high voltage power cable Download PDFInfo
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- CN221352426U CN221352426U CN202322917419.0U CN202322917419U CN221352426U CN 221352426 U CN221352426 U CN 221352426U CN 202322917419 U CN202322917419 U CN 202322917419U CN 221352426 U CN221352426 U CN 221352426U
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- layer
- low temperature
- crosslinked polyethylene
- voltage power
- power cable
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- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 24
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 24
- 239000000945 filler Substances 0.000 claims abstract description 12
- 239000003063 flame retardant Substances 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims abstract description 7
- 238000007906 compression Methods 0.000 claims abstract description 7
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920001971 elastomer Polymers 0.000 claims abstract description 6
- 239000006260 foam Substances 0.000 claims abstract description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000009954 braiding Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 claims description 3
- 229920002313 fluoropolymer Polymers 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 10
- 229920002725 thermoplastic elastomer Polymers 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009941 weaving Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model relates to the technical field of cables, in particular to a high-low temperature-resistant crosslinked polyethylene insulated medium-high voltage power cable, which comprises the following components: the cable comprises a plurality of conductive wire cores, a filling layer, an inner sheath, an armor layer, a buffer layer and an outer sheath which are arranged in a pairwise cutting way, wherein the conductive wire cores and the filling layer are wrapped by wrapping layers together to form a circular cross-section shape, and the buffer layer comprises a plurality of elastic supporting tubes which are uniformly distributed on the outer side of the inner sheath for a circle; the elastic supporting tube adopts the flame-retardant closed-cell sponge rubber tube, is light and soft, has good elasticity and flame retardance, can support the outer sheath, ensures the roundness of the section of the cable, simultaneously provides compression space for the low-temperature shrinkage of the outer sheath, avoids the cracking caused by the incapability of shrinkage of the outer sheath, improves the low-temperature cracking resistance of the cable, fills the phenolic foam heat-insulating filler strips in the elastic supporting tube, plays a heat-insulating role, reduces the influence of low temperature on the cable core, and avoids the cracking of the cable core.
Description
Technical Field
The utility model relates to the technical field of cables, in particular to a high-low temperature resistant crosslinked polyethylene insulated medium-high voltage power cable.
Background
The medium-high voltage power cable is mainly used for power transmission and distribution in the power system of each voltage level, wherein the medium-high voltage cable is mainly used as a distribution cable, and the high-voltage and ultrahigh-voltage cable is mainly used as a transmission cable. When the cable is in a low-temperature environment, the sheath and the insulating layer of the cable can crack, so that moisture invades the cable, the service life of the cable is prolonged, the insulativity of the cable is reduced, the cable cracks due to overlarge temperature difference, the conductor of the cable can generate heat when transmitting current, the cable core of the cable is higher in temperature, the cable temperature is sequentially reduced from the cable core to the outside, a temperature gradient is formed, and when the temperature of the external environment is too low, the temperature gradient is larger. At this time, the outer sheath of the cable is contracted inwards under the influence of low temperature, and compared with the outer side, the temperature in the cable is higher, the contraction rate generated by the influence of low temperature in the cable is smaller, so that the contraction of the outer sheath of the cable is restrained, and the outer sheath of the cable is cracked.
At present, in order to avoid cracking of the cable due to too low air temperature, the outer sheath is made of a material with good low temperature resistance, so that the shrinkage rate of the outer sheath in a low-temperature environment is reduced, and the cold resistance of the cable is improved.
Disclosure of utility model
In combination with the design and problems of the prior art crosslinked polyethylene insulated medium-high voltage power cable, according to a first aspect of the object of the present utility model, a high-low temperature resistant crosslinked polyethylene insulated medium-high voltage power cable is provided, comprising:
A plurality of conductive wire cores which are arranged in a pairwise cutting way;
A filling layer filled in gaps among the plurality of conductive wire cores, wherein the conductive wire cores and the filling layer are wrapped together by a wrapping layer to form a circular cross-section shape;
the inner sheath is extruded outside the wrapping layer;
the armor layer is coated on the outer side of the inner sheath;
the buffer layer is coated on the outer side of the armor layer;
the outer sheath is extruded outside the buffer layer;
The buffer layer comprises a plurality of elastic supporting tubes which are uniformly distributed on the periphery of the outer side of the armor layer, and can provide compression space for low-temperature shrinkage of the outer sheath;
The inside of the elastic supporting tube is filled with heat preservation filler strips.
Preferably, the elastic supporting tube is a flame-retardant closed-cell sponge rubber tube.
Preferably, the wall thickness of the elastic support tube is 2.0-2.5mm.
Preferably, the heat-insulating filler strips are phenolic foam strips.
Preferably, the inner sheath is made of ETFE fluoroplastic.
Preferably, the armor comprises a steel tape armor which is armored by a double layer metal tape and is wrapped with a left hand helical gap, the wrapping gap should not be greater than 50% of the metal tape width.
Preferably, the conductive wire core comprises a conductor, an insulating layer and a shielding layer, wherein the conductor is mutually twisted through a plurality of strands of wires and is extruded through the insulating layer to form a circular cross-section shape, and the shielding layer is coated on the outer side of the insulating layer.
Preferably, the insulating layer is a crosslinked polyethylene insulating layer.
Preferably, the shielding layer comprises an aluminum-plastic composite belt wrapping layer, and the wrapping coverage rate of the aluminum-plastic composite belt is more than 25%.
Preferably, the shielding layer further comprises a tinned copper wire braiding layer, the tinned copper wire braiding layer is coated on the outer side of the aluminum-plastic composite tape wrapping layer, the diameter of the tinned copper wire braiding layer is 0.12mm, and the braiding density is greater than 80%.
Compared with the prior art, the high-low temperature resistant crosslinked polyethylene insulated medium-high voltage power cable has the remarkable advantages that:
1. The high-low temperature-resistant crosslinked polyethylene insulated medium-high voltage power cable is characterized in that a buffer layer is arranged between an armor layer and an outer sheath, the buffer layer consists of a plurality of elastic support pipes which are uniformly distributed on the periphery of the outer side of the armor layer, and the elastic support pipes are flame-retardant closed-pore sponge rubber pipes, so that the cable is light and soft, has good elasticity and flame retardance, can support the outer sheath, ensures the roundness of the section of the cable, provides a compression space for low-temperature shrinkage of the outer sheath, avoids cracking caused by incapability of shrinkage of the outer sheath, and improves the low-temperature cracking resistance of the cable;
2. Meanwhile, the heat-insulating filler strips made of phenolic foam are filled in the elastic supporting tubes, so that the heat-insulating effect is achieved, the influence of low temperature on the cable core is reduced, and the cable core insulating layer is prevented from cracking.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the utility model will now be described, by way of example, with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a high-low temperature resistant crosslinked polyethylene insulated medium-high voltage power cable according to an embodiment of the utility model.
Fig. 2 is a schematic cross-sectional view of a high-low temperature resistant crosslinked polyethylene insulated medium-high voltage power cable according to an embodiment of the utility model.
Fig. 3 is a schematic structural view of an elastic support tube according to an embodiment of the present utility model.
In the above figures 1-3, the definition of the individual reference numerals is as follows:
1. A conductive wire core; 11. a conductor; 12. an insulating layer; 13. a shielding layer; 2. a filling layer; 3. wrapping the layer; 4. an inner sheath; 5. an armor layer; 6. a buffer layer; 61. an elastic support tube; 62. a heat-insulating filler strip; 7. an outer sheath.
Detailed Description
For a better understanding of the technical content of the present utility model, specific examples are set forth below, along with the accompanying drawings.
The crosslinked polyethylene insulated medium-high voltage power cable of the embodiment shown in fig. 1 comprises a conductive wire core 1, a filling layer 2, a wrapping layer 3, an inner sheath 4, an armor layer 5, a buffer layer 6 and an outer sheath 7.
Referring to fig. 1 and 2, the conductive wire core 1 includes a conductor 11, an insulating layer 12 and a shielding layer 13, wherein the conductor 11 is formed by twisting a plurality of oxygen-free copper wires, and is extruded by the insulating layer 12 to form a circular cross-section shape, and the shielding layer 13 is coated on the outer side of the insulating layer 12.
In an alternative embodiment, the insulating layer 12 is a crosslinked polyethylene insulating layer.
Further, the shielding layer 13 comprises an aluminum-plastic composite belt wrapping layer, the wrapping cover rate of the aluminum-plastic composite belt is larger than 25%, and the shielding layer has a good shielding effect and can play a role in blocking water.
Still further, shielding layer 13 still includes tinned copper wire weaving layer, and tinned copper wire weaving layer cladding is in the plastic-aluminum composite tape around the covering outside, and tinned copper wire diameter of tinned copper wire weaving layer is 0.12mm, and the weaving density is greater than 80%, further improves shielding effect.
As shown in fig. 1 and 2, the filling layer 2 is filled in the gaps among the plurality of conductive wire cores 1, the conductive wire cores 1 and the filling layer 2 are wrapped around the wrapping layer 3 together to form a circular cross-section shape, the gaps among the conductive wire cores 1 are supported by the filling layer 2, the roundness of the cross section of the cable is ensured, and insulation breakage caused by mutual extrusion of the conductive wire cores 1 is avoided.
In an alternative embodiment, the filling layer 2 is filled with glass fiber ropes, which can increase the tensile strength of the cable, while having good flame retardancy.
Further, the inner sheath 4 is extruded on the outer side of the wrapping layer 3, the inner sheath 4 is made of ETFE fluoroplastic, has good electrical insulation, high flame retardance and low smoke performance, the working temperature is between-65 ℃ and +150 ℃, the embrittlement temperature is as low as-100 ℃, and the electric power transmission requirement under electric power transmission and distribution is met.
As shown in fig. 1 and 2, the armor layer 5 is coated on the outer side of the inner sheath 4, the armor layer 5 comprises a steel tape armor layer, which can increase the compressive strength of the cable, the steel tape armor layer is armored by a double-layer metal tape and is wound by a left spiral gap, the winding gap should not be more than 50% of the width of the metal tape, and the gap of the inner metal tape should be covered by the part of the outer metal tape close to the middle, so that the steel tape armor layer can completely cover the inner sheath 4.
Further, the outer side of the armor layer 5 is provided with an outer sheath 7, the outer sheath 7 is formed by extrusion molding of a thermoplastic elastomer TPE, the thermoplastic elastomer TPE has high tearing strength and high friction resistance, and good protection is carried out on the cable, and meanwhile, the thermoplastic elastomer TPE also has good low-temperature flexibility, so that the outer sheath 7 is not easy to crack in a low-temperature environment.
However, the improvement of the cold resistance of the cable by changing the material is far from sufficient, and in actual use, the cable outer sheath is required to meet other performances such as chemical corrosion resistance, flame retardance, low smoke and no toxicity, and when materials for realizing the performances conflict, the cold resistance of the cable cannot be improved by the materials.
As shown in fig. 1 and 2, a buffer layer 6 is arranged between the armor layer 5 and the outer sheath 7, the buffer layer 6 comprises a plurality of elastic supporting tubes 61 uniformly distributed on the outer side of the armor layer 5 in a circle, and the tube walls of the elastic supporting tubes 61 can be compressed and have good elasticity.
Thus, when the outer sheath 7 is contracted inwards at low temperature, the elastic supporting tube 61 can provide a compression space for the low-temperature contraction of the outer sheath 7, so that the outer sheath 7 is prevented from cracking due to the incapability of contracting, and the low-temperature cracking resistance of the cable is improved.
In an alternative embodiment, the elastic support tube 61 is a flame-retardant closed-cell sponge rubber tube, which is light and soft, has good elasticity and flame retardance, can support the outer sheath 7, ensures the roundness of the section of the cable, has a wall thickness of 2.0-2.5mm, and preferably has a wall thickness of 2.5mm, so that a larger elastic compression space can be provided.
As shown in fig. 3, the inside of the elastic support tube 61 is filled with a heat-insulating filler strip 62, and the cable core is insulated by the heat-insulating filler strip 62, so that the influence of low temperature on the cable core is reduced.
In an alternative embodiment, the insulating filler strips 62 are phenolic foam fillers that provide good insulation while also providing good flame retardant properties, thereby improving the flame retardancy of the cable.
The above examples were combined: through set up buffer layer 6 between armor 5 and oversheath 7, buffer layer 6 comprises a plurality of evenly distributed in the elasticity stay tube 61 of armor 5 outside a week, and elasticity stay tube 61 adopts fire-retardant formula closed cell sponge rubber tube, its light in weight, softness, have good elasticity and fire-retardant type, can support oversheath 7, guarantee cable cross-section's roundness, provide compression space for oversheath 7's low temperature shrink simultaneously, avoid oversheath 7 unable shrink to take place the fracture, improve cable's low temperature cracking resistance, and through pack the heat preservation filler strip 62 that the material is phenolic foam in elasticity stay tube 61's inside, play the heat retaining effect, reduce the influence of low temperature to the cable core, avoid cable core insulating layer 12 fracture, promote cable's temperature resistance ability.
While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present utility model. Accordingly, the scope of the utility model is defined by the appended claims.
Claims (10)
1. A high and low temperature resistant crosslinked polyethylene insulated medium and high voltage power cable, comprising:
A plurality of conductive wire cores (1) which are arranged in a pairwise and cut mode;
A filling layer (2) filled in gaps among the plurality of conductive wire cores (1), wherein the conductive wire cores (1) and the filling layer (2) are wrapped together by a wrapping layer (3) to form a circular cross-sectional shape;
An inner sheath (4) extruded outside the wrapping layer (3);
An armor layer (5) which is coated on the outer side of the inner sheath (4);
a buffer layer (6) which is coated on the outer side of the armor layer (5);
An outer sheath (7) extruded outside the buffer layer (6);
The buffer layer (6) comprises a plurality of elastic supporting tubes (61) which are uniformly distributed on the periphery of the outer side of the armor layer (5) and can provide compression space for low-temperature shrinkage of the outer sheath (7);
The inside of the elastic supporting tube (61) is filled with heat-insulating filler strips (62).
2. The high-low temperature-resistant crosslinked polyethylene insulated medium-high voltage power cable according to claim 1, wherein the elastic supporting tube (61) is a flame-retardant closed-cell sponge rubber tube.
3. The high and low temperature resistant crosslinked polyethylene insulated medium and high voltage power cable according to claim 1, wherein the wall thickness of the elastic support tube (61) is 2.0-2.5mm.
4. The high and low temperature resistant crosslinked polyethylene insulated medium and high voltage power cable according to claim 1, wherein the insulating filler strips (62) are phenolic foam strips.
5. The high-low temperature resistant crosslinked polyethylene insulated medium-high voltage power cable according to claim 1, wherein the inner sheath (4) is made of ETFE fluoroplastic.
6. The high and low temperature resistant crosslinked polyethylene insulated medium and high voltage power cable according to claim 1, characterized in that the armor layer (5) comprises a steel tape armor layer which is armored by a double layer metal tape and is wound with a left hand spiral gap, the winding gap should not be more than 50% of the width of the metal tape.
7. The high-low temperature-resistant crosslinked polyethylene insulated medium-high voltage power cable according to any of claims 1-6, wherein the conductive wire core (1) comprises a conductor (11), an insulating layer (12) and a shielding layer (13), the conductor (11) is mutually twisted through a plurality of strands of wires and is extruded through the insulating layer (12) to form a circular cross-section shape, and the shielding layer (13) is coated on the outer side of the insulating layer (12).
8. The high and low temperature resistant crosslinked polyethylene insulated medium and high voltage power cable according to claim 7, wherein the insulating layer (12) is a crosslinked polyethylene insulating layer.
9. The high-low temperature-resistant crosslinked polyethylene insulated medium-high voltage power cable according to claim 7, wherein the shielding layer (13) comprises an aluminum-plastic composite tape wrapping layer, and the wrapping lap rate of the aluminum-plastic composite tape is more than 25%.
10. The high-low temperature-resistant crosslinked polyethylene insulated medium-high voltage power cable according to claim 9, wherein the shielding layer (13) further comprises a tinned copper wire braid, the tinned copper wire braid is coated on the outer side of the aluminum-plastic composite tape wrapping layer, the diameter of the tinned copper wire braid is 0.12mm, and the braiding density is more than 80%.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221352426U true CN221352426U (en) | 2024-07-16 |
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