CN218730001U - Small-section bending-resistant medium-voltage power cable - Google Patents
Small-section bending-resistant medium-voltage power cable Download PDFInfo
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- CN218730001U CN218730001U CN202222870902.3U CN202222870902U CN218730001U CN 218730001 U CN218730001 U CN 218730001U CN 202222870902 U CN202222870902 U CN 202222870902U CN 218730001 U CN218730001 U CN 218730001U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Abstract
A small-section bending-resistant medium-voltage power cable comprises a conductor, wherein a first wrapping layer, a composite insulating layer, a second wrapping layer, a composite shielding layer and an outer sheath are wrapped outside the conductor from inside to outside; the conductor is a category 5 tin-plated copper conductor; the conductor is formed by layering and stranding a plurality of tinned copper monofilaments from inside to outside, and the stranding pitch diameter ratio of the tinned copper monofilaments at the outermost layer ranges from 12 to 14 times; the ratio of the twisted pitch diameter of the tin-plated copper monofilament of the inner layer is 16-23; the twisting directions of the tinned copper monofilaments of adjacent layers are opposite; the first wrapping layer is formed by overlapping and wrapping polyimide tapes, and the wrapping direction is opposite to the twisting direction of the tin-plated copper monofilament on the outermost layer; the composite insulating layer is composed of a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside; the second wrapping layer is formed by overlapping and wrapping a semi-conductive nylon belt; the composite shielding layer consists of a copper-plastic composite tape wrapping layer and a tinned copper wire braided layer from inside to outside; the outer sheath is made of polyethylene-nitrile rubber composite sheath material.
Description
Technical Field
The utility model belongs to the technical field of the medium voltage power cable technique and specifically relates to a medium voltage power cable who is applicable to rated voltage 6/10kV belongs to cable technical field.
Background
The power cable is mainly used for transmitting and distributing electric energy. In some special environments, the low-voltage power cable is limited by the low-voltage power cable, so that electromagnetic interference generated to the outside cannot be effectively reduced, and meanwhile, when the low-voltage power cable is bent, an electric field of the low-voltage power cable cannot be homogenized.
SUMMERY OF THE UTILITY MODEL
The size of a conductor of the small-section cable needs to meet the requirement of electric energy transmission, and the small-section cable needs to start from a protective structure outside the conductor to meet various protective functions and performance requirements of the conductor, so that the small-section cable needs to be thin in thickness and resistant to winding. Meanwhile, the conductor itself needs to further improve the performance of the conductor such as resistance to winding and the like under the condition of meeting the requirement of a power transmission function. The negative influence between the newly designed conductor and its outer shielding is also eliminated as much as possible in the cable as a whole product.
To the above problem, the utility model discloses middling pressure power cable forces on in the lectotype of the material of cable structure design and oversheath, improves cable bending property and increases the wearability and the impact resistance of cable, reaches bend radius and is 6 times of cable radius, does benefit to the installation in the special equipment, increases the interference killing feature of cable simultaneously.
The technical scheme adopted for solving the technical problems is as follows:
a small-section bending-resistant medium-voltage power cable comprises a section area less than or equal to 6mm 2 The conductor is characterized in that a first wrapping layer, a composite insulating layer, a second wrapping layer, a composite shielding layer and an outer sheath are wrapped outside the conductor from inside to outside; the outer diameter range of the cable is 13.0-17.0 mm;
the conductor is a category 5 tin-plated copper conductor; the conductor is formed by layering and stranding a plurality of tinned copper monofilaments from inside to outside, and the stranding pitch diameter ratio of the tinned copper monofilaments at the outermost layer ranges from 12 to 14 times; the ratio of the twisted pitch diameter of the tinned copper monofilament of the inner layer is 16-23; the twisting directions of the tinned copper monofilaments of adjacent layers are opposite;
the first wrapping layer is formed by overlapping and wrapping polyimide tapes, the wrapping direction is opposite to the twisting direction of the tin-plated copper monofilament on the outermost layer, the width of each polyimide tape is 10-15 mm, and the wrapping and covering rate is not less than 25%;
the composite insulating layer is composed of a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside;
the second wrapping layer is formed by overlapping and wrapping a semi-conductive nylon tape, and the wrapping and covering rate is not less than 25%;
the composite shielding layer consists of a copper-plastic composite tape wrapping layer and a tinned copper wire braided layer from inside to outside;
the outer sheath is a thermoplastic sheath formed by polyethylene-nitrile rubber composite sheath materials.
The medium-voltage power cable with the structure adopts the 5-type tin-plated copper conductor to increase the flexibility on the premise of meeting the basic requirements of cable electrical performance and the like. The copper-plastic composite belt and the tinned copper wire composite shield is used for replacing a copper belt shield to increase the flexibility of the copper belt shield and reduce air gaps during bending. The bending property and the wear resistance of the cable are improved by adopting the polyethylene-nitrile rubber compound thermoplastic sheath material.
Because the sheath of the cable is a thermoplastic sheath, heating the cable prior to installation of the cable can cause the cable to become more flexible.
The structural design of the power cable enables the outer diameter range of the cable to be controlled within 13.0-17.0 mm.
Advantageous effects
After the technical scheme is adopted, the utility model discloses following beneficial effect has:
(1) The conductor adopts 5 types of tin-plated copper, so that the bending performance of the conductor is improved, the conductor after tin plating also has oxidation resistance, and the service life of the cable is prolonged.
(2) The composite shielding structure is used, the structure can achieve 100% of shielding effect, the cable is softer, and air gaps generated when the cable is laid and bent are reduced, so that partial discharge is caused.
(3) The low-smoke halogen-free flame-retardant EPR insulating layer and the polyethylene-nitrile rubber compound thermoplastic sheath enable the cable structure to be softer, the minimum bending radius can reach 6 times of the outer diameter of the cable, the cable is easier to bend, and the cable is more convenient and suitable for bending and laying environments.
Drawings
Fig. 1 is a schematic radial cross-sectional view of the cable of this example.
In the figure: conductor 1, first around covering 2, composite insulation layer 3, second around covering 4, composite shielding layer 5, oversheath 6.
Detailed Description
As shown in figure 1, the small-section bending-resistant medium-voltage power cable comprises a section area less than or equal to 6mm 2 The conductor 1 is coated with a first wrapping layer 2, a composite insulating layer 3 and a second wrapping layer from inside to outside the conductor 1,A second wrapping layer 4, a composite shielding layer 5 and an outer sheath 6; the outer diameter of the cable ranges from 13.0 mm to 17.0mm.
the first wrapping layer 2 is formed by overlapping and wrapping polyimide tapes, the wrapping direction is opposite to the twisting direction of the tin-plated copper monofilament on the outermost layer, the width of each polyimide tape is 10-15 mm, and the wrapping overlapping rate is not less than 25%;
the composite insulating layer 3 is composed of a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside;
the second wrapping layer 5 is formed by overlapping and wrapping a semi-conductive nylon tape, and the wrapping and covering rate is not less than 25%;
the composite shielding layer 6 consists of a copper-plastic composite tape wrapping layer and a tinned copper wire braided layer from inside to outside;
the outer sheath 6 is a thermoplastic sheath made of polyethylene-nitrile rubber composite sheath material.
In the cable structure, the conductor adopts a 5-class tin-plated copper conductor, so that the cable has excellent bending performance, the conductor can be prevented from being oxidized, and the service life of the cable is prolonged; the insulating layer is made of EPR insulating materials, so that the cable is softer, and the insulating bending resistance is improved; the shielding layer adopts double-layer shielding, the bending property of the cable is improved, the sheath adopts a polyethylene-nitrile rubber compound thermoplastic sheath, and the sheath material has unique bending property and wear resistance.
In this example:
the cross-sectional area of the conductor is 4mm 2 ～6mm 2 (ii) a The conductor monofilament has a diameter of 0.193mm.
The stranding direction of the tin-plated copper monofilament on the outermost layer in the conductor is the left direction, and the overlapping wrapping direction of the polyimide belt of the first wrapping layer is the right direction.
The conductor shielding layer, the insulating layer and the insulating shielding layer are of a three-layer co-extrusion structure;
the conductor shielding layer is composed of 35kV semi-conductive inner shielding material (Dow, brand: HFDA-0587 BK); the nominal thickness of the conductor shield layer is 0.8mm;
the insulating layer is made of insulating material (EPR insulating material, brand: XJ-30 HB); the nominal thickness of the insulating layer is 3.4mm, and the thickness of the thinnest point is not less than 90-0.1 mm of the nominal value;
the insulation shielding layer is made of insulation shielding material (brand: XP-30 HB); the nominal thickness of the insulating shield layer is 0.8mm.
The width of the semiconductive nylon tape of the second wrapped package was 15mm.
The thickness of the copper-plastic composite belt is 0.05mm, and the thickness of the copper foil of the copper-plastic composite belt is 0.030-0.035 mm; the lapping and covering rate of the copper-plastic composite tape is not less than 15%; the diameter of the tinned copper wire braid is 0.25mm, and the braiding density is not less than 80-82%.
The thickness of the outer sheath is 1.4mm.
The outer sheath is a thermoplastic sheath composed of polyethylene-nitrile rubber compound (optional sheath material brand: HR 357). The material is mainly polyethylene, the nitrile rubber is used as a compound of a reinforcing agent, and the nitrile rubber is added, so that the plasticity and the elasticity of the cable can be improved, the wear resistance and the impact resistance of the cable can be improved, the elasticity and the flexibility of the cable can be improved, and the bending times of the cable can be greatly improved.
The shielding layer of the cable consists of a copper-plastic composite belt and a tinned copper wire composite shield. This structure has had concurrently replaced the tin-plated copper shielding, and for the tin-plated copper strips, this shielding structure can realize the effect of full shielding, compares in tin-plated copper strips shielding structure, and this composite shield layer makes the cable softer, reduces the air gap that the cable produced when laying the bending.
After the scheme is adopted, the minimum bending radius of the medium-voltage power cable can reach 6 times of the outer diameter of the cable, the bending performance is greatly improved, and the interference viewing capability and the electric field homogenizing capability are enhanced. And simultaneously meets the basic requirements of electrical and mechanical properties.
The power cable of this example has been subjected to the following tests, with the results of the tests being acceptable.
The cable has excellent softness, the bending radius is not less than 6D (D is the diameter of the cable), and the mechanical properties of the insulation and the sheath meet the relevant requirements of tables 15 and 18 in GB/T12706-2020.
The anti-interference performance is good, and the shielding inhibition coefficient is not more than 0.05.
Has excellent electrical performance, and 3.5U is applied between the core and the shield 0 And (5) the kV alternating voltage is tested for 5min, and the cable is not broken down.
The cable has good flame retardant property, and the carbonization height of the cable is not more than 1.5m according to GB/T18380 flame retardant B type bundled combustion test.
Claims (7)
1. A small-section bending-resistant medium-voltage power cable comprises a section area less than or equal to 6mm 2 The conductor is characterized in that a first wrapping layer, a composite insulating layer, a second wrapping layer, a composite shielding layer and an outer sheath are wrapped outside the conductor from inside to outside; the outer diameter range of the cable is 13.0-17.0 mm;
the conductor is a category 5 tin-plated copper conductor; the conductor is formed by layering and stranding a plurality of tinned copper monofilaments from inside to outside, and the stranding pitch diameter ratio of the tinned copper monofilaments at the outermost layer ranges from 12 to 14 times; the ratio of the twisted pitch diameter of the tin-plated copper monofilament of the inner layer is 16-23; the twisting directions of the tinned copper monofilaments of adjacent layers are opposite;
the first wrapping layer is formed by overlapping and wrapping polyimide belts, the wrapping direction is opposite to the twisting direction of the tin-plated copper monofilament on the outermost layer, the width of the polyimide belts is 10-15 mm, and the wrapping overlapping rate is not less than 25%;
the composite insulating layer is composed of a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside;
the second wrapping layer is formed by overlapping and wrapping a semi-conductive nylon tape, and the wrapping and covering rate is not less than 25%;
the composite shielding layer consists of a copper-plastic composite tape wrapping layer and a tinned copper wire braided layer from inside to outside;
the outer sheath is a thermoplastic sheath formed by polyethylene-nitrile rubber composite sheath materials.
2. A small-section, flex-resistant medium-voltage power cable according to claim 1, characterized in that the cross-section of the conductor is 4mm 2 ～6mm 2 (ii) a The conductor monofilament has a diameter of 0.193mm.
3. The small-section deflection-resistant medium-voltage power cable as claimed in claim 1, wherein the stranding direction of the tin-plated copper monofilaments on the outermost layer of the conductor is the left direction, and the overlapping lapping direction of the polyimide tape of the first lapping layer is the right direction.
4. The small-section flex-resistant medium-voltage power cable according to claim 1, wherein the conductor shielding layer, the insulating layer and the insulating shielding layer are of a three-layer co-extrusion structure;
the conductor shielding layer is composed of 35kV semi-conductive inner shielding material; the nominal thickness of the conductor shield layer is 0.8mm;
the insulating layer is made of insulating materials; the nominal thickness of the insulating layer is 3.4mm, and the thickness of the thinnest point is not less than 90-0.1 mm of the nominal value;
the insulation shielding layer is made of insulation shielding materials; the nominal thickness of the insulating shield layer is 0.8mm.
5. A small-section, flex-tolerant medium voltage power cable according to claim 1, characterized in that the width of the semiconductive nylon tape of the second covering is 15mm.
6. The small-section bending-resistant medium-voltage power cable as claimed in claim 1, wherein the thickness of the copper-plastic composite belt is 0.05mm, and the thickness of the copper foil of the copper-plastic composite belt is 0.030-0.035 mm; the lapping and covering rate of the copper-plastic composite tape is not less than 15%;
the diameter of the tinned copper wire braid is 0.25mm, and the braiding density is not less than 80-82%.
7. A small-section, flex-resistant medium-voltage power cable according to claim 1, characterized in that the thickness of the outer sheath is 1.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222870902.3U CN218730001U (en) | 2022-10-30 | 2022-10-30 | Small-section bending-resistant medium-voltage power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222870902.3U CN218730001U (en) | 2022-10-30 | 2022-10-30 | Small-section bending-resistant medium-voltage power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218730001U true CN218730001U (en) | 2023-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222870902.3U Active CN218730001U (en) | 2022-10-30 | 2022-10-30 | Small-section bending-resistant medium-voltage power cable |
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| Country | Link |
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| CN (1) | CN218730001U (en) |
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- 2022-10-30 CN CN202222870902.3U patent/CN218730001U/en active Active
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