CN206075912U - A kind of anti-water tree midium voltage cable - Google Patents

Abstract

This utility model provides a kind of anti-water tree midium voltage cable, including the cable core of the insulated wire cores composition no less than, the insulated wire cores include conductor from the inside to the outside successively, conductor shield, insulating barrier and insulation screen, the conductor is that the multiply for adding water-proofing powder presses copper conductor, the material of the conductor shield and insulation screen is the polyethylene semiconductive shieldin material containing 30% ethylene ethyl acrylate, the material of the insulating barrier is the montmorillonite crosslinked polyethylene of addition 1%, it is coated with water blocking layer and oversheath outside the cable core successively, it is packed layer between the insulated wire cores and cable core.This utility model waterproof tree cable is applied to long-term humidity, in rainy environment, can effectively slow down the invasion of moisture content, suppresses the generation of water tree, increases cable life；Low cost, processing technology are simple, lightweight, it is easy to laying installation, are with a wide range of applications.

Description

A kind of anti-water tree midium voltage cable

Technical field

This utility model belongs to technical field of electric wires and cables, especially a kind of anti-water tree medium-pressure power cable.

Background technology

At present, the midium voltage cable overwhelming majority for being used in the range of China is crosslinked polyetylene insulated power cable, due to crosslinking The outstanding electric and mechanical performance of polyethylene, low cost, technical maturity, in midium voltage cable field, possess the status do not replaced, But act of god and anthropic factor are excluded, crosslinked polyethylene midium voltage cable easily, in the presence of water and electricity, generates water tree, enters One step punctures, and terminates the life-span of cable.So, the invasion for suppressing moisture and the water resistant tree for improving cross-linked poly-ethylene cable material generate Ability is particularly important for midium voltage cable service life is extended.America and Europe, the method applied in this regard by Japan and other countries, technology Reach its maturity, and China is relatively fewer in the research and development energy input by water resistant tree field, and be applied to middle piezoelectricity on this basis The technology of cable actual production is just less.

Utility model content

The technical problems to be solved in the utility model is to provide a kind of anti-water tree midium voltage cable, can suppress water tree generation and Growth, extends the service life of cable.

To reach above-mentioned purpose, the technological means that this utility model is adopted for：A kind of anti-water tree midium voltage cable, including it is many The cable core of the insulated wire cores composition of Yu Yigen, the insulated wire cores include conductor, conductor shield, insulating barrier from the inside to the outside successively And insulation screen, the conductor is that the multiply for adding water-proofing powder presses copper conductor, the conductor shield and insulation shielding The material of layer is the polyethylene semiconductive shieldin material containing 30% ethylene-ethylacrylate, and the material of the insulating barrier is to add The montmorillonite crosslinked polyethylene for plus 1%, is coated with water blocking layer and oversheath, the insulated wire cores and cable core successively outside the cable core Between be packed layer.

Further, the material of the packed layer is waterproofing rope.

Further, the material of the water blocking layer is polyethylene.

Further, the thickness of the water blocking layer is not less than 2mm.

Further, the material of the oversheath is polrvinyl chloride.

The beneficial effects of the utility model are：A kind of anti-water tree medium-pressure power cable that this utility model is provided, in knot There is on structure excellent longitudinal, radial water-resisting ability, when moisture is longitudinally invaded, water-proofing powder and waterproofing rope can be anti-with water in time Should, expand, the infiltration passage of final obstruction water；Polyethylene water blocking layer then can be in the infiltration for radially effectively preventing moisture.It is used exhausted Edge layer material and semiconductive shieldin material play the role of extremely strong suppression water tree and generate and grow；Weatherability flexibility polychlorostyrene used The different environmental changes of the wide adaptation of ethylene energy.The service life of cable can be extended, it is cost-effective, meet it is most it is rainy, The use requirement of the Code in Hazardous Special Locations such as humidity, excellent product performance, and good economic and social benefit can be produced.

Description of the drawings

Fig. 1 is structural representation of the present utility model；

In figure：Conductor 1；Water-proofing powder 2；Conductor shield 3；Insulating barrier 4；Insulation screen 5；Waterproofing rope 6；Water blocking layer 7； Oversheath 8.

Structure of the present utility model is further described in detail below in conjunction with the drawings and the specific embodiments.

Specific embodiment

As shown in figure 1, the structural representation of a kind of anti-water tree medium-pressure power cable provided for this utility model, including by The cable core of many insulated wire cores compositions, the insulated wire cores include conductor 1 and are extruded in the conductor screen of 1 outer surface of conductor successively Layer 3, insulating barrier 4 and insulation screen 5 are covered, the conductor 1 presses copper conductor for the multiply of addition water-proofing powder 2, and conductive surface should Bright and clean, impulse- free robustness, water-proofing powder should be dried and add uniform；The conductor shield 3 and insulation screen 5 are containing 30% second The Low Density Polyethylene semiconductive shieldin material of alkene-ethyl acrylate (EEA), with traditional ethene-vinyl acetate semi-conductive screen Material is compared, and with higher heat stability, outstanding mechanical performance, 5 outer bundle copper strips of insulation screen is wrapped；The insulating barrier 4 to add the cross-linked polyethylene insulating material of 1% montmorillonite (MMT), and the montmorillonite of nano-scale can be uniformly dispersed in crosslinking and gather In ethylene matrix, and serve as nucleator effect promote heterogeneous nucleation, reduce crystal size, increase amount of crystals, so as to reach To the effect for suppressing water tree.

It is coated with polyethylene water blocking layer 7 and polrvinyl chloride oversheath 8, the insulated wire cores and cable core outside the cable core successively Between be packed layer 6, the material of packed layer 6 is waterproofing rope, and waterproofing rope should keep drying, and stranding is shaped, extrudes polyethylene resistance Water layer 7 its thickness should be not less than 2mm；Oversheath 8 is weatherability flexible PVC material, can preferably adapt to the change of environment.

A kind of anti-water tree medium-pressure power cable of this utility model patent relative humidity more than 65% environment in compared to Its dielectric loss of pressure cable in common is substantially reduced, its sample after the immersion 72h of water, in stripping of insulatin layer its conductor shielding Surface is dry, is expected to increase by 20 years service life of cable after technique practical application.

Claims (5)

1. a kind of anti-water tree midium voltage cable, including the cable core of the insulated wire cores composition no less than, it is characterised in that：It is described exhausted Edge core includes conductor (1), conductor shield (3), insulating barrier (4) and insulation screen (5) from the inside to the outside successively, described to lead Body (1) for add water-proofing powder (2) multiply press copper conductor, the conductor shield (3) and insulation screen (5) material it is equal It is the polyethylene semiconductive shieldin material containing 30% ethylene-ethylacrylate, the material of the insulating barrier (4) is addition 1% Montmorillonite crosslinked polyethylene, is coated with water blocking layer (7) and oversheath (8), the insulated wire cores and cable core successively outside the cable core Between be packed layer (6).

2. a kind of anti-water tree midium voltage cable according to claim 1, it is characterised in that：The material of the packed layer (6) is Waterproofing rope.

3. a kind of anti-water tree midium voltage cable according to claim 1, it is characterised in that：The material of the water blocking layer (7) is Polyethylene.

4. a kind of anti-water tree midium voltage cable according to claim 3, it is characterised in that：The thickness of the water blocking layer (7) is not Less than 2mm.

5. a kind of anti-water tree midium voltage cable according to claim 1, it is characterised in that：The material of the oversheath (8) is Weatherability polyvinyl chloride.