CN208521680U

CN208521680U - Water resistant tree power cable with cross-linked polyethylene insulation is pressed in one kind

Info

Publication number: CN208521680U
Application number: CN201821358374.0U
Authority: CN
Inventors: 董柯; 李斌; 凌国桢
Original assignee: Jiangsu Shangshang Cable Group Co Ltd
Current assignee: Jiangsu Shangshang Cable Group Co Ltd
Priority date: 2018-08-22
Filing date: 2018-08-22
Publication date: 2019-02-19
Anticipated expiration: 2028-08-22

Abstract

The utility model discloses water resistant tree power cable with cross-linked polyethylene insulation, including round compact conductor, semiconductive conductor shield, the crosslinked polyetylene insulated layer of water resistant tree, semi-conductive insulation shield layer, metal wire shielding layer and oversheath are pressed in one kind；Semiconductive conductor shield is coated on the periphery of round compact conductor；The crosslinked polyetylene insulated layer of water resistant tree is coated on the periphery of semiconductive conductor shield；Semi-conductive insulation shield layer is coated on the periphery of the crosslinked polyetylene insulated layer of water resistant tree；Metal wire shielding layer surrounds the periphery that semi-conductive insulation shield layer is arranged in；Oversheath is coated on the periphery of semi-conductive insulation shield layer；The wire of metal wire shielding layer is in oversheath.For the power cable using water resistant tree cross-linked polyethylene insulating material as insulation, proof voltage is horizontal high, is not likely to produce insulated water tree branch in During Process of Long-term Operation.

Description

Water resistant tree power cable with cross-linked polyethylene insulation is pressed in one kind

Technical field

The utility model belongs to field of cable technology, specifically a kind of middle crosslinked polyetylene insulated electric power electricity of pressure water resistant tree Cable.

Background technique

Traditional medium-pressure power cable is for a long time in wet condition using water tree is also easy to produce, and the service life of cable is significantly It reduces, loss greatly increases.

Summary of the invention

Purpose of utility model: providing one kind can use in wet condition for a long time, and be not likely to produce the electric power of water tree Cable.

Technical solution: middle pressure water resistant tree power cable with cross-linked polyethylene insulation described in the utility model, including it is round tight Press conductor, semiconductive conductor shield, the crosslinked polyetylene insulated layer of water resistant tree, semi-conductive insulation shield layer, metal wire shielding layer And oversheath；Semiconductive conductor shield is coated on the periphery of round compact conductor；The crosslinked polyetylene insulated layer packet of water resistant tree Overlay on the periphery of semiconductive conductor shield；Semi-conductive insulation shield layer is coated on the outer of the crosslinked polyetylene insulated layer of water resistant tree It encloses；Metal wire shielding layer surrounds the periphery that semi-conductive insulation shield layer is arranged in；Oversheath is coated on semi-conductive insulation shield layer Periphery；The wire of metal wire shielding layer is in oversheath.

Further, the structural parameters of round compact conductor are as follows: the structural parameters of round compact conductor are as follows: nominal section 53.49mm²Round compact conductor D.C. resistance less than 0.551 Ω/km, outer diameter is nominally 9.5mm；Nominal section 33.62mm² Round compact conductor D.C. resistance less than 0.872 Ω/km, outer diameter is nominally 7.4mm；Nominal section 107.2mm²Circle it is tight Conductor DC resistance is pressed to be not more than 0.274 Ω/km, outer diameter is nominally 13.4mm.

Further, the thinnest part thickness of semiconductive conductor shield is not less than 0.30mm.

Further, the thickness range of the crosslinked polyetylene insulated layer of water resistant tree is 5.33~6.35mm.

Further, the thickness range of semi-conductive insulation shield layer is 0.76~1.52mm.

Further, the wire of metal wire shielding layer is 6 around the twisted lay ratio range of semi-conductive insulation shield layer ~10 times, the filament diameter of wire is 1.63mm.

Further, the thickness range of oversheath is 1.14~2.03mm.

The utility model compared with prior art, the beneficial effect is that: use the cross-linked polyethylene insulating material conduct of water resistant tree Insulation, proof voltage is horizontal high, and longtime running operating temperature reaches 90 DEG C, insulation water is not likely to produce in cable During Process of Long-term Operation Branch greatly improves the service life of cable, reduces loss, and harmless recoverable, has environmental protection characteristic, polyvinyl resin Abundance, facilitates acquisition, and processing cost is low；Semiconductive conductor shield, the crosslinked polyetylene insulated layer of water resistant tree, half of cable Conductive insulation screen is the production of three-layer co-extruded formula, and three-layer co-extruded formula production ensure that the cleanliness of cable insulation, reduce insulation In impurity, stomata, guarantee the long-term running validity of cable insulation.

Detailed description of the invention

Fig. 1 is the cross-section of cable structural schematic diagram of the utility model.

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.

Embodiment 1:

As shown in Figure 1, middle pressure water resistant tree power cable with cross-linked polyethylene insulation described in the utility model includes: round tight Press conductor 1, semiconductive conductor shield 2, the crosslinked polyetylene insulated layer 3 of water resistant tree, semi-conductive insulation shield layer 4, wire screen Cover layer 5 and oversheath 6；Semiconductive conductor shield 2 is coated on the periphery of round compact conductor 1；Water resistant tree crosslinked polyethylene Insulating layer 3 is coated on the periphery of semiconductive conductor shield 2；Semi-conductive insulation shield layer 4 is coated on water resistant tree crosslinked polyethylene The periphery of insulating layer 3；Metal wire shielding layer 5 surrounds the periphery that semi-conductive insulation shield layer 4 is arranged in；Oversheath 6 is coated on half The periphery of conductive insulation screen 4；The wire of metal wire shielding layer 5 is in oversheath 6.Round compact conductor 1, semiconductive The crosslinked polyetylene insulated layer 3 of conductor shield 2, water resistant tree and semi-conductive insulation shield layer 4 collectively form insulated wire cores.

Further, the structural parameters of round compact conductor 1 are as follows: the structural parameters of round compact conductor 1 are as follows: nominal section 53.49mm²1 D.C. resistance of round compact conductor less than 0.551 Ω/km, outer diameter is nominally 9.5mm；Nominal section 33.62mm² 1 D.C. resistance of round compact conductor less than 0.872 Ω/km, outer diameter is nominally 7.4mm；Nominal section 107.2mm²Circle 1 D.C. resistance of compact conductor is not more than 0.274 Ω/km, and outer diameter is nominally 13.4mm；Meet ICEA S-94-649 standard regulation.

Further, the thinnest part thickness of semiconductive conductor shield 2 is not less than 0.30mm.

Further, the thickness range of the crosslinked polyetylene insulated layer 3 of water resistant tree is 5.33~6.35mm.

Further, the thickness range of semi-conductive insulation shield layer 4 is 0.76~1.52mm.

Further, the wire of metal wire shielding layer 5 is around the twisted lay ratio range of semi-conductive insulation shield layer 4 6~10 times, the filament diameter of wire is 1.63mm.

Further, the thickness range of oversheath 6 is 1.14~2.03mm.

Conductor shielding, insulation shielding are semiconductive shieldin materials, and insulation is water resistant tree cross-linked polyethylene insulating material, harmless to return It receives and utilizes；Longtime running operating temperature reaches 90 DEG C；Proof voltage is horizontal high, is not likely to produce insulation water in cable During Process of Long-term Operation Branch greatly improves the service life of cable, reduces loss；Polyvinyl resin abundance, facilitates acquisition, and processing cost is low.

Semiconductive conductor shield, the crosslinked polyetylene insulated layer of water resistant tree and semi-conductive insulation shield layer are three-layer co-extruded knots Structure, which is wrapped in outside conductor, constitutes insulated wire cores.

After testing, the Specifeca tion speeification of this cable is as follows:

1, conductor running temperature: conductor longtime running maximum temperature is no more than 90 DEG C, and (longest continues 5s) does not surpass when short-circuit Cross 250 DEG C.

2, AC voltage test: the ac test voltage of original application should be not more than the specified alternating voltage of subject cable, The duration of AC voltage test should be 5min, and insulation does not puncture.

3, partial discharge test: it is no it is any be more than statement sensitivity (5pC or more excellent) can measuring electricity.

4, accelerate water tree test: all conductor shielding/insulator interfaces need to carry out acceleration water tree experimental performance detection in 360 days； All insulation/insulation shielding interface must satisfy the acceleration water tree experimental performance detection of test in 120 days, as a result need to meet ICEA The related request of S-94-649.

5, insulating impurities, Ferroxyl test: by the spiral on the cable of appropriate length or in some other convenient methods Cutting obtains 20 continuously by conductor shielding, the thin slice of insulation and insulation shielding composition.Thin slice 25mils (0.64mm) is thick. Blade is sharp, and the sheet thickness of generation will uniformly, and surface wants smooth.Insulating impurities quantity, pore opening need to meet ICEA S- The related request of 94-649.

6, protrusion, micropore inspection: if the contact surface of extruded insulation shielding and insulation is cylindrical, extension cannot is embedded in Insulation is more than 5mils (0.127mm), insertion extruded insulation protrusion of the shielding more than 7mils (0.180mm) with irregularly；Insulation Interface between extruded insulation shielding is without any micropore greater than 5mils (0.127mm).

7, external screen disbonded test: the pulling force for removing insulation shielding from insulation at room temperature will be between 13.4N and 107N. At -10 DEG C to 40 DEG C of temperature, insulation shielding will be easily peeled off, and not have the residue that cannot be removed after slightly wiping on insulating surface Conductive material.

8, environmental stress resistance is tested: three general 1.5 inches (38.1mm) for being derived from sample are long, and 0.5 inch (12.7mm) The sample of width, 0.125 inch of (3.18mm) thickness will be from the material overmolded for being envisaged for squeezing out.The temperature of mold sample will be reduced to Any suitable value.General 0.75 inch (19.0mm) length is cut with blade, 0.020 to 0.025 inch (0.51 arrives 0.64mm) deep crack, is located at one of them 1.5 inches of centre of surface divided by 0.5 inch (38.1mm is divided by 12.7mm).

Crack will outside when sample is bent, and sample will be placed on length 200mm, in the developmental tube of outer diameter 32mm.Add Add anti-cracking agent so that sample is completely covered.The developmental tube of suitable closure will be placed on 50 DEG C ± 1 DEG C by the way of such as packet foil cork Baking oven in 48 hours.At the end of this stage, sample will be removed, and allow to drop to room temperature, and check cracking situation.

9, resistance to solar radiation test: the top and bottom of 5 samples will be mounted on xenon arc irradiation and water spray exposure device Rack on, exposure duration will be 1000 hours.Prepare 5 samples, carries out tension and elongation rate test.Respective average value is wanted The value of 5 tensile strength and elongation that are obtained according to sample calculates.These average values will be divided by 5 of the acquisition of unaged sample The equivalent average value of tensile strength and elongation values.If not maintaining tensile strength or elongation after exposure in 1000 hours 75% or more retention rate, then material is not resistance to solar radiation.

As described above, although the utility model has been indicated and described referring to specific preferred embodiment, it must not It is construed to the limitation to the utility model itself.In the spirit and scope for not departing from the utility model that appended claims define Under the premise of, it can various changes can be made in the form and details to it.

Claims

1. pressing water resistant tree power cable with cross-linked polyethylene insulation in one kind, it is characterised in that: including round compact conductor (1), half Electric conductor shielded layer (2), the crosslinked polyetylene insulated layer of water resistant tree (3), semi-conductive insulation shield layer (4), metal wire shielding layer (5) and oversheath (6)；Semiconductive conductor shield (2) is coated on the periphery of round compact conductor (1)；The crosslinking of water resistant tree is poly- Ethylene insulating layer (3) is coated on the periphery of semiconductive conductor shield (2)；Semi-conductive insulation shield layer (4) is coated on water resistant tree The periphery of crosslinked polyetylene insulated layer (3)；Metal wire shielding layer (5) surrounds setting in the periphery of semi-conductive insulation shield layer (4)； Oversheath (6) is coated on the periphery of semi-conductive insulation shield layer (4)；The wire of metal wire shielding layer (5) is embedded in oversheath (6) It is interior.

2. middle pressure water resistant tree power cable with cross-linked polyethylene insulation according to claim 1, it is characterised in that: circle is pressed The structural parameters of conductor (1) are as follows: nominal section 53.49mm²Round compact conductor (1) D.C. resistance less than 0.551 Ω/km, Outer diameter is nominally 9.5mm；Nominal section 33.62mm²Round compact conductor (1) D.C. resistance less than 0.872 Ω/km, outer diameter It is nominally 7.4mm；Nominal section 107.2mm²Round compact conductor (1) D.C. resistance be not more than 0.274 Ω/km, outer diameter mark Referred to as 13.4mm.

3. middle pressure water resistant tree power cable with cross-linked polyethylene insulation according to claim 1, it is characterised in that: semiconductive is led The thinnest part thickness of body shielded layer (2) is not less than 0.30mm.

4. middle pressure water resistant tree power cable with cross-linked polyethylene insulation according to claim 1, it is characterised in that: water resistant tree is handed over The thickness range for joining polyethylene layer (3) is 5.33~6.35mm.

5. middle pressure water resistant tree power cable with cross-linked polyethylene insulation according to claim 1, it is characterised in that: semiconductive is exhausted The thickness range of edge shielded layer (4) is 0.76~1.52mm.

6. middle pressure water resistant tree power cable with cross-linked polyethylene insulation according to claim 1, it is characterised in that: wire screen Covering twisted lay ratio range of the wire of layer (5) around semi-conductive insulation shield layer (4) is 6~10 times, the monofilament of wire Diameter is 1.63mm.

7. middle pressure water resistant tree power cable with cross-linked polyethylene insulation according to claim 1, it is characterised in that: oversheath (6) thickness range is 1.14~2.03mm.