CN201532808U

CN201532808U - Single-phase 27.5kV electric power cable of electrified railway

Info

Publication number: CN201532808U
Application number: CN2009203116907U
Authority: CN
Inventors: 张海涛; 陈沛云; 曲国安
Original assignee: QINGDAO HANHE CABLE CO Ltd
Current assignee: QINGDAO HANHE CABLE CO Ltd
Priority date: 2009-09-28
Filing date: 2009-09-28
Publication date: 2010-07-21
Anticipated expiration: 2019-09-28

Abstract

The utility model relates to a cable, in particular to a single-phase 27.5kV electric power cable of an electrified railway, which comprises a wire core, the outer side of which is sequentially wrapped with a metal shielding layer, an inner lining layer, a nonmagnetic metal wire armor layer and an outer sheath from inside to outside; the wire core sequentially comprises a conductor core, a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside; the conductor core is a cylindrical compression copper conductor; and the conductor shielding layer, the insulating layer and the insulating shielding layer are sequentially and closely covered on the surface of the conductor core in a co-extrusion way. The electric power cable meets the requirements of voltage endurance grade and grounding in an electrified railway system, and can effectively ensure the safe operation of the line. In addition, the product has simple structure, strong applicability, convenient construction and high reliability, thus being widely applied to a 27.5kV cable line of the electrified railway.

Description

The single-phase 27.5kV power cable of electric railway

Technical field

The utility model relates to a kind of cable, relates in particular to the power cable of the single-phase 27.5kV of a kind of electric railway.

Background technology

The particularity of present China electric railway 27.5kV single-phase (over the ground), voltage withstand class is equivalent to the requirement of withstand voltage of power system device 42kV, between 35kV and 66kV electrical voltage system grade, simultaneously the characteristics and the power department that change of single-phase direct ground connection working method of railway and short-term load (duty) is different greatly, causes the cable can not be general fully with 27.5kV equipment.

The utility model content

Technique effect of the present utility model can overcome above-mentioned defective, provides a kind of electric railway single-phase 27.5kV power cable, and it is simple in structure, and versatility is good.

For achieving the above object, the utility model adopts following technical scheme: it comprises core, the core outside is coated metal screen, inner covering, nonmagnetic metal silk armour and oversheath successively from inside to outside, core is followed successively by conductor cores, conductor shield, insulating barrier and insulation screen from inside to outside, conductor cores is the cylindrical copper conductor that presses, conductor shield, insulating barrier, the three-layer co-extruded conductor cores surface that closely is coated on successively of insulation screen.

Conductor wire core forms cylindrical conductor by the many stranded backs of pressing of copper single line, coating one in conductor thread core outside is the conductor shield of base-material with the polyolefin, and is that base-material is the crosslinked polyetylene insulated layer of crosslinking agent with the peroxide and is the insulation screen of base-material with the polyolefin with the low density polyethylene (LDPE).

Metal screen layer is formed around soft copper silk and copper strips by dredging, and is oppositely tightened by copper strips on the copper wire surface.Between metal screen layer and the core, the semiconductive lapping layer is set as resilient coating respectively between metal screen layer and the inner covering.Inner covering adopts PE or PVC material, and inner covering evenly closely is extruded in the semiconductive lapping layer surface in the metal screen layer outside.Nonmagnetic metal silk armour is closely arranged and is wrapped in inner covering outer surface, wrapped the tightening of nonmagnetic metal silk armour external application twining package tape.Oversheath evenly is coated on the outer lapping layer surface of armouring closely.Graphite material should evenly be smeared as semi-conductive layer in the oversheath outside.According to the requirement of environment for use, the utility model cable also can be made low-smoke non-halogen flame-retardant or low smoke and low halogen type.

The utility model provides a kind of can satisfy the 27.5kV power cable that uses in the electric railway, satisfies in the electric railway system cable voltage grade and grounding requirement, can guarantee the safe operation of circuit effectively.Product structure is simple in addition, applicability is strong, and easy construction, and reliability height can be widely used in the electric railway 27.5kV cable line.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is explained:

Fig. 1 is the utility model internal structure schematic diagram.

Embodiment

It comprises core cable over the ground of the present utility model, the core outside is coated metal screen 6, inner covering 7, nonmagnetic metal silk armour 8 and oversheath 10 successively from inside to outside, and core is followed successively by conductor cores 1, conductor shield 2, insulating barrier 3 and insulation screen 4 from inside to outside.

Conductor cores 1 is pressed stranded forming by the copper single line, and conductor shield 2, insulating barrier 3, insulation screen 4 are extruded jointly through three layers, and conductor shield 2 nominal thickness are 0.8mm, and thinnest part is not less than 80% of nominal value, and the insulation nominal thickness is 12mm; Insulating barrier 3 average thickness value are not less than nominal thickness, and the thinnest dot thickness of any place is not less than 90% of nominal value.

Metal screen layer 6 is formed around soft copper silk and copper strips by dredging, and is oppositely tightened by copper strips on the copper wire surface.Between metal screen layer 6 and the core, semiconductive lapping layer 5 is set as resilient coating respectively between metal screen layer 6 and the inner covering 7.Inner covering 7 evenly closely is extruded in the surface of the semiconductive lapping layer 5 in the metal screen layer outside.Nonmagnetic metal silk armouring is closely arranged for 8 layers and is wrapped in inner covering 7 outer surfaces, nonmagnetic metal silk armour 8 external application twining package tapes 9 wrapped tightening.Oversheath 10 evenly is coated on the surface of twining package tape 9 closely.Graphite material is evenly smeared as semi-conductive layer 11 in oversheath 10 outsides.

Semiconductive lapping layer 5 rates of putting up in the core outside are not less than 25%, and metal screen layer 6 adopts copper wire to dredge around form, and copper wire should be dredged on core, and pitch is no more than 10 times of pitch circle diameter, and keeps in touch with core all the time.Mean gap is not more than 4mm between the adjacent copper wire, and any two adjacent copper wire gaps are not more than 8mm.Copper wire is used the wide copper strips of the thick 30-40mm of 0.1mm outward and is oppositely tightened, and metal screen layer 6 sectional areas should satisfy the short circuit current requirement.Two semiconductive lapping layers 5 employing is insulated, temperature resistant grade is identical plastic tape or straps are wrapped, and the rate of putting up is not less than 25%.Inner covering 7 adopts PE or PVC material, nonmagnetic metal silk armour 8 adopts the nonmagnetic metal silk closely to be wrapped in outside the inner covering 7, can avoid excessive cable heating, the reduction current-carrying situation of causing of cable eddy current loss to take place, can bear certain short circuit current, and can bear certain pulling force, prevent to construct and when laying cable is caused damage, twining package tape 9 is two-layer twining package tape, and the rate of putting up is not less than 25%.

Oversheath 10 adopts PE or PVC material, nominal thickness is 3.0mm, the thinnest point is not less than nominal value 85%-0.1mm, evenly smearing graphite material outside the oversheath 10 is semi-conductive layer 11, conveniently be used for the sheath test, fire-retardant, low-smoke non-halogen flame-retardant, its inner covering 7 of low smoke and low halogen type cable and oversheath 10 adopt fire-retardant PE, flame-proof PVC or low smoke halogen-free flame-retardant polyolefin, the low smoke and low halogen polyolefine material, twining package tape 9 should adopt four layers of fire-retardant strap wrapped for category-A when fire-retardant, category-B is fire-retardant should to adopt two-layer fire-retardant strap wrapped, is used for satisfying burning grade and smoke density requirement.

Claims

1. single-phase 27.5kV power cable of electric railway, comprise core, the core outside is coated metal screen, inner covering, nonmagnetic metal silk armour and oversheath successively from inside to outside, it is characterized in that core is followed successively by conductor cores, conductor shield, insulating barrier and insulation screen from inside to outside, conductor cores is the cylindrical copper conductor that presses, conductor shield, insulating barrier, the three-layer co-extruded conductor cores surface that closely is coated on successively of insulation screen.

2. the single-phase 27.5kV power cable of electric railway according to claim 1 is characterized in that metal screen layer forms around soft copper silk and copper strips by dredging, and is oppositely tightened by copper strips on the copper wire surface.

3. the single-phase 27.5kV power cable of electric railway according to claim 1 and 2 is characterized in that between metal screen layer and the core, the semiconductive lapping layer is set as resilient coating respectively between metal screen layer and the inner covering.

4. the single-phase 27.5kV power cable of electric railway according to claim 3 is characterized in that inner covering evenly closely is extruded in the semiconductive lapping layer surface in the metal screen layer outside.

5. the single-phase 27.5kV power cable of electric railway according to claim 3 is characterized in that tight arrangement of nonmagnetic metal silk armour is wrapped in inner covering outer surface, wrapped the tightening of nonmagnetic metal silk armour external application twining package tape.

6. the single-phase 27.5kV power cable of electric railway according to claim 3 is characterized in that oversheath evenly closely is coated on the twining package tape surface.

7. the single-phase 27.5kV power cable of electric railway according to claim 6 is characterized in that evenly smearing graphite material as semi-conductive layer outside the oversheath.