CN209691473U

CN209691473U - A kind of lower shrinkage type single-core medium-voltage power cable

Info

Publication number: CN209691473U
Application number: CN201920752133.2U
Authority: CN
Inventors: 李亮; 邱东春; 范瑾; 狄洪杰
Original assignee: Jiangsu Shangshang Cable Group Co Ltd
Current assignee: Jiangsu Shangshang Cable Group Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2019-11-26
Anticipated expiration: 2029-05-23

Abstract

A kind of lower shrinkage type single-core medium-voltage power cable, the copper wires dredge winding layer successively wrapped up including from-inner-to-outer outside core and core, copper strip layer, nonwoven layer, liner layer, the first low-smoke non-halogen flame-retardant belt, inner restrictive coating, the second low-smoke non-halogen flame-retardant belt and external sheath layer；The core is made of conductor wrapping layer, insulating layer and the insulation screen that from-inner-to-outer outside conductor and conductor successively wraps up；Copper wires dredge winding layer is dredged around outside insulation screen；The copper strips for constituting copper strip layer is overlapped outside copper wire, and lapping direction is opposite with the lapping direction of copper wires dredge winding layer；Nonwoven layer is made of outside copper strip layer nonwoven fabric belts；Liner layer is coated on outside non-woven fabrics.This power cable has good telescopicing performance, while using a variety of shielding measures, with the external electromagnetic radiation of insulated conductor.

Description

A kind of lower shrinkage type single-core medium-voltage power cable

Technical field

The utility model belongs to field of cable technology, specifically a kind of lower shrinkage type single-core medium-voltage power cable.

Background technique

In the prior art, the important technology index of the cable of communication system or coordinative composition of equipments have the thermal contraction performance of cable with And shielding properties.The jacket shrinkage rate in the biggish environment of the temperature difference how is reduced, guarantee its normal power supply and takes into account cable Electric property, be the technical issues that need to address.

Summary of the invention

Purpose of utility model: a kind of low-shrinkage and the good power cable of shield effectiveness are provided.

Technical solution: a kind of lower shrinkage type single-core medium-voltage power cable, including from-inner-to-outer is successively outside core and core The copper wires dredge winding layer 8 of package, copper strip layer 7, nonwoven layer 6, liner layer 5, the first low-smoke non-halogen flame-retardant belt 4, inner restrictive coating 3, Second low-smoke non-halogen flame-retardant belt 2 and external sheath layer 1；

Conductor wrapping layer 11 that the core is successively wrapped up by from-inner-to-outer outside conductor 12 and conductor, 10 and of insulating layer Insulation screen 9 is constituted；

Copper wires dredge winding layer 8 is dredged around outside insulation screen 9；The copper strips overlapping for constituting copper strip layer 7 is dredged around copper wire Outside winding layer 8, and lapping direction is opposite with the lapping direction of copper wires dredge winding layer；

Nonwoven layer 6 is made of outside copper strip layer 7 nonwoven fabric belts；

Liner layer 5 is coated on outside nonwoven layer 6；

First low-smoke non-halogen flame-retardant belt 4 is made of outside liner layer 5 the first low-smoke non-halogen flame-retardant band；

Second low-smoke non-halogen flame-retardant belt 2 is made of outside inner restrictive coating 3 the second low-smoke non-halogen flame-retardant band；

The inner restrictive coating and external sheath layer are all that (fire-retardant ST can be used in polythene PE protective cover material₇PE material) constitute Restrictive coating.

Further, the nominal thickness of the inner restrictive coating and external sheath layer is all for 2.5mm, and thinnest point is not less than nominal 90%.

Further, the conductor 12 is the twisted copper conductor for pressing composition of bare copper wire that 19 diameters are 2.62mm.

Further, conductor wrapping layer 11 is outside conductor 12, using semiconductive nylon tape, the most thin and thick of conductor wrapping layer Degree is not less than 0.75mm.

Further, the insulation screen 9 uses semi-conductive insulation shield material, is extruded in outside insulating layer 10；

The average thickness of insulating layer is not less than 10.5mm, and most thin thickness is not less than 9.98mm；

Insulation screen is peelable type, and insulation screen most thin thickness is not less than 0.80mm, the bias of insulation screen Degree is not more than 8%.

Further, copper wires dredge winding layer 8 is dredged around around insulation screen 9, constitutes the single copper wire section of copper wires dredge winding layer Product is not less than 35mm², the mean gap of adjacent copper wire is no more than 4mm.

The average overlap rate of copper strip layer is not less than 20%, and minimum overlap rate is not less than 5%.

Further, liner layer 5 is to extrude inner lining material (PVC material that fire-retardant ST2 can be used) in the outer structure of nonwoven layer 6 At liner layer nominal thickness is not less than 0.92mm；

Nonwoven layer is constituted by the non-woven fabrics of one layer of nominal thickness 0.2mm is wrapped, and average overlap rate is not less than 15%.

Further, the nominal thickness 0.2mm of the first and second low-smoke non-halogen flame-retardant belt；First and second low-smoke non-halogen flame-retardant The average overlap rate of the twining package tape of belt is all not less than 15%.

This power cable has good telescopicing performance, while using a variety of shielding measures, with the external electricity of insulated conductor Magnetic radiation.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model.

In figure: external sheath layer 1, the second low-smoke non-halogen flame-retardant belt 2, inner restrictive coating 3, the first low-smoke non-halogen flame-retardant belt 4, Liner layer 5, nonwoven layer 6, copper strip layer 7, copper wires dredge winding layer 8, insulation screen 9, insulating layer 10, conductor wrapping layer 11, conductor 12。

Specific embodiment

Technical solutions of the utility model are described in detail with reference to the accompanying drawing, but the protection scope of the utility model It is not limited to the embodiment.

As shown in Figure 1, a kind of lower shrinkage type single-core medium-voltage power cable, including outside core and core, from-inner-to-outer is successively The copper wires dredge winding layer 8 of package, copper strip layer 7, nonwoven layer 6, liner layer 5, the first low-smoke non-halogen flame-retardant belt 4, inner restrictive coating 3, Second low-smoke non-halogen flame-retardant belt 2 and external sheath layer 1；

Liner layer 5 is coated on outside nonwoven layer 6；

The inner restrictive coating and external sheath layer are all the restrictive coatings that lower shrinkage protective cover material is constituted.

In this example, conductor 12 presses circular copper conductors using 2 classes, is that the bare copper wire that 19 diameters are 2.62mm is twisted The bare copper conductor arrived.

Conductor shield 11 is extruded by cross-linking type semiconductive shieldin material and is constituted.

Insulating layer 10 and insulation screen 9 form the insulated part of cable, and insulation is using crosslinked polyetylene insulated, nominal thickness Degree is 10.5mm, and average thickness is not less than nominal thickness, and thinnest part thickness is not less than the 95% of nominal thickness value.Insulation eccentricity degree ≤ 8%.Insulation shielding uses peelable type, thinnest point >=0.80mm.The electric insulation when major function of insulating layer 10 is made With guaranteeing to be not in distortion or deep fades when signal code passes through conductor propagation.Meeting structure size requirement and electrical property In the case where energy, thickness of insulating layer should be thin as far as possible, to reduce the outside diameter of cable, reduces the consumption of other materials, i.e. reduction product Cost.

It is dredged using copper wire and is reversely overlapped wrapped composition metallic shield, copper wire sectional area >=35mm around+copper strip surface², reversely It is overlapped the copper strips of wrapped one layer of nominal thickness 0.15mm, the average overlap rate between copper strips should be not less than 20% nominal value, minimum Overlap rate should be not less than 5%, and the non-woven fabrics of wrapped one layer of nominal thickness 0.2mm is overlapped outside metallic shield, and average overlap rate is not small In 15%.

Liner layer 5 uses high fire-retardance ST₂PVC sheath material, liner layer are overlapped the low of wrapped one layer of nominal thickness 0.2mm outside Cigarette halogen-free flameproof band.Sheath uses fire-retardant ST using the double-deck uniform thickness₇PE protective cover material, nominal thickness 2.5mm, thinnest point is not Less than nominal 90%, the low-smoke non-halogen flame-retardant band of wrapped one layer of 0.2mm is overlapped between two layers of sheath, average overlap rate is not less than 15%.

After testing, the performance parameter of this cable is as follows:

(1) insulation heat extends: 200 DEG C, 15min, 0.2N/mm²Condition, maximum elongation rate is less than or equal to 175% under load (65%), maximum permanent elongation is less than or equal to 15% (0%) after cooling.130 DEG C, under the conditions of 1h, insulation thermal contraction is less than etc. In 4% (2%).

(2) mechanical performance before and after insulation ag(e)ing: tensile strength is not less than 12.5Mpa (23.1Mpa) before aging, extension at break Rate is not less than 200% (550%)；135 DEG C, after 168h aging, variation in tensile strength ± 25% (+10%) of maximum, fracture is stretched Maximum ± 25% (- 7%) of long rate change rate.

(3) mechanical performance before and after sheath aging: tensile strength is not less than 12.5Mpa (12.9Mpa) before aging, extension at break Rate is not less than 300% (370%)；110 DEG C, after 240h aging, elongation at break is not less than 300% (350%)；Sheath is anti-to be opened Split pass the test；Under 80 DEG C, 5h, 5 times cycling conditions, it is less than or equal to 3% (1%).

(4) bunchy combustion experiment (B class) is tested: carbonization height is not more than 2.5m (1.2m).

Claims

1. a kind of lower shrinkage type single-core medium-voltage power cable, it is characterised in that: successively including from-inner-to-outer outside core and core The copper wires dredge winding layer (8) of package, copper strip layer (7), nonwoven layer (6), liner layer (5), the first low-smoke non-halogen flame-retardant belt (4), Inner restrictive coating (3), the second low-smoke non-halogen flame-retardant belt (2) and external sheath layer (1)；

Conductor wrapping layer (11) that the core is successively wrapped up by the outer from-inner-to-outer of conductor (12) and conductor, insulating layer (10) and Insulation screen (9) is constituted；

Copper wires dredge winding layer (8) dredge around around insulation screen (9) outside；The copper strips for constituting copper strip layer (7) is overlapped around copper wire Dredge winding layer (8) outside, and lapping direction is opposite with the lapping direction of copper wires dredge winding layer；

Nonwoven layer (6) is to be made of outside nonwoven fabric belts around copper strip layer (7)；

Liner layer (5) is coated on nonwoven layer (6) outside；

First low-smoke non-halogen flame-retardant belt (4) is to be made of outside the first low-smoke non-halogen flame-retardant band around liner layer (5)；

Second low-smoke non-halogen flame-retardant belt (2) is to be made of outside the second low-smoke non-halogen flame-retardant band around inner restrictive coating (3)；

The inner restrictive coating and external sheath layer are all the restrictive coatings that polythene PE protective cover material is constituted.

2. lower shrinkage type single-core medium-voltage power cable according to claim 1, it is characterised in that: the inner restrictive coating and outer The nominal thickness of restrictive coating is all for 2.5mm, and thinnest point is not less than nominal 90%.

3. lower shrinkage type single-core medium-voltage power cable according to claim 1, it is characterised in that: the conductor (12) is ten The twisted copper conductor for pressing composition of the bare copper wire that nine diameters are 2.62mm.

4. lower shrinkage type single-core medium-voltage power cable according to claim 1, it is characterised in that: conductor wrapping layer (11) around Packet conductor (12) outside, the most thin thickness of conductor wrapping layer is not less than 0.75mm；

Conductor wrapping layer uses the wrapped composition of semiconductive nylon tape.

5. lower shrinkage type single-core medium-voltage power cable according to claim 1, it is characterised in that: the insulation screen It (9) is to extrude semi-conductive insulation shield material to constitute outside in insulating layer (10)；

Insulation screen is peelable type, and insulation screen most thin thickness is not less than 0.80mm, and the degree of eccentricity of insulation screen is not Greater than 8%.

6. lower shrinkage type single-core medium-voltage power cable according to claim 1, it is characterised in that: copper wires dredge winding layer (8) is dredged Around around insulation screen (9), the single copper wire sectional area of copper wires dredge winding layer is constituted not less than 35mm², adjacent copper wire it is flat Equal gap is no more than 4mm；

7. lower shrinkage type single-core medium-voltage power cable according to claim 1, it is characterised in that: liner layer (5) is to extrude Inner lining material is constituted outside in nonwoven layer (6)；Liner layer nominal thickness is not less than 0.92mm；

8. lower shrinkage type single-core medium-voltage power cable according to claim 1, it is characterised in that: the first and second low cigarette The nominal thickness 0.2mm of halogen-free flameproof belt；The average overlap rate of the twining package tape of first and second low-smoke non-halogen flame-retardant belt is not small In 15%.