CN201975152U

CN201975152U - High-voltage direct-current cable

Info

Publication number: CN201975152U
Application number: CN2011200763692U
Authority: CN
Inventors: 何维国; 周雁; 尹毅; 张宇; 江平开; 柳松; 杨玉智; 章铭杰; 彭嘉康; 陈守直
Original assignee: SHANGHAI HUAPU CABLE CO Ltd; Shanghai Jiejin Electric Power New Materials Co Ltd; Shanghai Jiaotong University; Shanghai Municipal Electric Power Co
Current assignee: SHANGHAI HUAPU CABLE CO Ltd; Shanghai Jiejin Electric Power New Materials Co Ltd; Shanghai Jiaotong University; Shanghai Municipal Electric Power Co
Priority date: 2011-03-22
Filing date: 2011-03-22
Publication date: 2011-09-14
Anticipated expiration: 2021-03-22

Abstract

The utility model discloses a high-voltage direct-current cable which comprises a copper conductor, an inner semi-conductive shielding layer, an insulating layer, an outer semi-conductive shielding layer, a copper strip shielding layer, a radial water blocking layer, a lognitudinal water blocking layer and a polyethylene sheath. The copper conductor is arranged in the center of the innermost layer of the high-voltage direct-current cable; the inner semi-conductive shielding layer is coated outside the copper conductor; the insulating layer is coated outside the inner semi-conductive shielding layer; the outer semi-conductive shielding layer is coated outside the insulating layer; the copper strip shielding layer is coated outside the outer semi-conductive shielding layer; the radial water blocking layer is coated outside the copper strip shielding layer; the lognitudinal water blocking layer is coated outside the radial water blocking layer; the polyethylene sheath is coated outside the lognitudinal water blocking layer; the insulating layer adopts cross-linked polyethylene (XLPE) and 1% magnesium hydroxide (MH), the generation of the space charge is inhibited, the maximum electric field strength around the cable is reduced, and the electrical condition for the safe operation of the high-voltage direct-current transmission is satisfied.

Description

High voltage direct current cable

Technical field

The utility model relates to a kind of direct current cables that is used for the high-voltage dc transmission electrical domain, is specifically related to a kind of high voltage direct current cable.

Background technology

High voltage direct current transmission is a technology of ABB AB's exploitation, is intended to improve the efficient of long distance power transmission.At present, the cable of developing in the general ABB AB of high-voltage dc transmission electrical domain.As shown in Figure 1, the high voltage direct current cable of ABB AB exploitation comprises and is arranged on the conductor 11 of penetralia as transferring electric power, this conductor 11 is adopted and is made of aluminum or copper, semi-conductor electricity screen 12, insulating barrier 13, outer semiconductor electric screen layer 14, metal screen layer 15, swellable tape layer 16, aluminum slice layer 17 and shell (sheath) 18 in being coated with successively from the inside to the outside outside conductor 11.Wherein, interior semi-conductor electricity screen 12 and outer semiconductor electric screen layer 14 adopt semi-conductive polymer to make, and insulating barrier 13 adopts crosslinked HVDC polymer to make, and metal screen layer 15 adopts copper strips, and shell 18 adopts polythene material to make.The average field-strength of the high voltage direct current cable control insulating barrier that ABB AB's design is produced is about 15kV/mm.

The utility model content

The utility model has illustrated a kind of high voltage direct current cable, can better suppress space charge and produce, and its insulating barrier has lower average field-strength, satisfies the electric condition of cable running safety.

For achieving the above object, the utility model discloses a kind of high voltage direct current cable, is characterized in, this cable comprises:

Copper conductor, this copper conductor are arranged on the innermost layer center of cable;

Inner semiconductor layer, this inner semiconductor layer are coated on outside the above-mentioned copper conductor;

Insulating barrier, this insulating barrier are coated on outside the above-mentioned inner semiconductor layer;

Out semiconductor layer, this out semiconductor layer are coated on outside the above-mentioned insulating barrier;

The copper strips screen, this copper strips screen is coated on outside the above-mentioned out semiconductor layer;

Vertical water blocking layer, this vertical water blocking layer is coated on outside the above-mentioned copper strips screen;

Radial resistivity water layer, this radial resistivity water layer overlay on outside above-mentioned vertical water blocking layer; And

Pe sheath, this pe sheath is coated on outside the above-mentioned radial resistivity water layer.

Above-mentioned inner semiconductor layer and out semiconductor layer adopt semi-conductive polymer to make.

Above-mentioned insulating barrier adopts crosslinked polyethylene and nano magnesia to be mixed and made into.

Above-mentioned vertical water blocking layer adopts wrapped single face waterstop outside described copper strips screen.

Above-mentioned radial resistivity water layer adopts the aluminium-plastic tape that is coated in the described pe sheath.

A kind of high voltage direct current cable of the utility model explanation is compared with prior art, its advantage is, insulating barrier of the present utility model adopts crosslinked polyethylene (XLPE) and nano magnesia (MH) to be mixed and made into, can suppress the generation of space charge well, make the maximum field intensity of the utility model cable be lower than the average field-strength of the high voltage direct current cable of prior art, satisfy the electric condition of high voltage direct current transmission security operation.

Description of drawings

Fig. 1 is the structural representation of the high voltage direct current cable of prior art;

Fig. 2 is the structural representation of the utility model high voltage direct current cable;

Fig. 3 is the distribution map of the electric field of the insulating barrier of the utility model high voltage direct current cable.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described.

As shown in Figure 2, the utility model discloses a kind of high voltage direct current cable, this voltage cable grade is 30kV, and single cored structure, nominal cross are 300mm ²The center of cable is provided with copper conductor 21; closely be coated with 8 layers of protective layer or screen outside copper conductor 21, it is followed successively by inner semiconductor layer 22, insulating barrier 23, out semiconductor layer 24, copper strips screen 25, vertical water blocking layer 26, radial resistivity water layer 27 and pe sheath 28 from the inside to the outside.

Copper conductor 21 is arranged on the penetralia of cable, and it adopts the stranded copper core that presses that is made of copper.Copper conductor 21 adopts circle to press lay configuration, and performance meets the regulation of GB/T3956.This copper conductor 21 that presses after stranded requires intact broken string and pine burst phenomenon, and surface requirements is bright and clean, rounding, no greasy dirt, burr, sharp edge etc., and the single line in the gummed conductor allows welding, and weld requires to repair smooth.

Inner semiconductor layer 22 closely is coated on outside the copper conductor 21, and it adopts the semiconductive polymer material, is peelable material not.This inner semiconductor layer 22 requires to extrude, and smooth surface, even, rounding require no wedge angle, crackle, particle, abrasive vestige.Its nominal thickness is 0.8mm, and average thickness is not less than 0.6mm(technology controlling and process average thickness 0.7mm).

Insulating barrier 23 closely is coated on outside the inner semiconductor layer 22, and it adopts cross-linking polyethylene materials, also can adopt crosslinked polyethylene (XLPE) and 1% nano magnesia (MH) composite material.This insulating barrier 23 meets evenly, the burnt grain of free from admixture, nothing, imperforate requirement.The average thickness of insulating barrier 23 is not less than the nominal value 4.0mm(technology controlling and process average thickness 4.15mm of regulation), the thinnest dot thickness of insulating barrier 23 is not less than the 90%mm of nominal value.As shown in Figure 3, adopt the generation of the insulating barrier 23 energy good restraining space charges of XLPE+1%MH material, as seen from the figure, maximum electric field strength is about about 12.5kV/mm, is lower than the average field-strength (this average field-strength is about 15kV/mm) of the direct current cables insulating barrier of prior art.

Out semiconductor layer 24 is extruded in insulating barrier 23 surfaces equably, and it adopts the semiconductive polymer material, is peelable material not, and to extrude the type insulation shielding material be peelable material if adopt.These out semiconductor layer 24 smooth surfaces, require no wedge angle, crackle, particle, burn or abrasive vestige.Its nominal thickness 0.8mm, average thickness are not less than 0.6mm(technology controlling and process average thickness 0.7mm).

Copper strips screen 25 closely is coated on outside the out semiconductor layer 24.It adopts copper wire to dredge around structure, shielding cross section 25mm ², design joint back 44/0.85mm.Copper wire shielding by left-hand dredge around the soft copper silk forms, its surface is thin around tightening (copper strips specification position 10*0.12mm) with reverse copper strips.The mean gap of adjacent copper wire is not more than 8mm.

Also wrapped one deck single face semiconductive waterstop in copper strips screen 25, semiconductive waterstop thickness in monolayer is 0.3mm.The semiconductive waterstop adopts overlapping wrapped, and Duplication is controlled between 10% ~ 20%.

Vertically water blocking layer 26 is closely wrapped on copper strips screen 25 surfaces for one deck single face insulation waterstop.Vertical water blocking layer 26 thickness 0.2mm.It adopts overlapping wrapped, and Duplication is controlled between 10% ~ 20%.When vertical water blocking layer 26 was wrapped, vertically water blocking layer 26 was provided with the one side of water-proofing powder towards copper strips screen 25.

Radial resistivity water layer 27 closely is coated on outside vertical water blocking layer 26, in the pe sheath 28.It adopts the layer of aluminum plastic composite strip, and the two-sided aluminium/plastic composite strip of nominal thickness 0.3, overlapping width are 5-10mm.

Pe sheath 28 closely is coated on outside the radial resistivity water layer 27.It adopts low-shrinkage double-peak high-density polytene material, and the nominal thickness 2.1mm of sheath, average thickness should be not less than specified minimum value (technology controlling and process average thickness 2.21mm), and its thinnest part thickness is not less than the 85%-0.1 of minimum value.These pe sheath 28 surface requirements roundings, thickness are even, the defective of surperficial free from admixture, burnt grain, pore, and its section requires no macroscopic pore.Extruding of this sheath need be tight, smooth, continuous.

Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be conspicuous.Therefore, protection range of the present utility model should be limited to the appended claims.

Claims

1. a high voltage direct current cable is characterized in that, this cable comprises:

Copper conductor (21), this copper conductor (21) is arranged on the cable innermost layer;

Inner semiconductor layer (22), this inner semiconductor layer (22) are coated on outside the described copper conductor (21);

Insulating barrier (23), this insulating barrier (23) are coated on outside the described inner semiconductor layer (22);

Out semiconductor layer (24), this out semiconductor layer (24) are coated on outside the described insulating barrier (23);

Copper strips screen (25), this copper strips screen (25) is coated on outside the described out semiconductor layer (24);

Vertical water blocking layer (26), this vertical water blocking layer (26) is coated on outside the described copper strips screen (25);

Radial resistivity water layer (27), this radial resistivity water layer (27) are coated on outside described vertical water blocking layer (26); And, pe sheath (28), this pe sheath (28) is coated on outside the described radial resistivity water layer (27).

2. high voltage direct current cable as claimed in claim is characterized in that, described inner semiconductor layer (22) and out semiconductor layer (24) adopt semi-conductive polymer to make.

3. high voltage direct current cable as claimed in claim is characterized in that, described insulating barrier (23) adopts crosslinked polyethylene and nano magnesia to be mixed and made into.

4. high voltage direct current cable as claimed in claim is characterized in that, described vertical water blocking layer (26) adopts wrapped single face waterstop outside described copper strips screen (25).

5. high voltage direct current cable as claimed in claim is characterized in that, described radial resistivity water layer (27) adopts the aluminium-plastic tape that is coated in the described pe sheath (28).