CN202363162U - High voltage DC land cable - Google Patents
High voltage DC land cable Download PDFInfo
- Publication number
- CN202363162U CN202363162U CN2011204736463U CN201120473646U CN202363162U CN 202363162 U CN202363162 U CN 202363162U CN 2011204736463 U CN2011204736463 U CN 2011204736463U CN 201120473646 U CN201120473646 U CN 201120473646U CN 202363162 U CN202363162 U CN 202363162U
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- shielding layer
- semiconductor layer
- high voltage
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Abstract
Disclosed is a high voltage DC land cable, from inside to outside, comprising a conductor, an inner semiconduction shielding layer, an insulating layer, an outer semiconduction shielding layer, a radial watertight diaphragm, a vertical watertight diaphragm, and an outer jacket, wherein an auxiliary inner semiconduction shielding layer is formed via extrusion between the conductor and the inner semiconduction shielding layer; and an auxiliary outer semiconduction shielding layer is formed via extrusion between the outer semiconduction shielding layer and the radial watertight diaphragm. An auxiliary inner semiconduction shielding layer and an auxiliary outer semiconduction shielding layer are added to the high voltage DC land cable of the utility model, which have a flat and smooth surface, without stripping or powder phenomenon. In addition, the high voltage DC land cable can play a role in buffering, so the inner semi-conduction shielding layer is unlikely to be squeezed into the conductor in an insulating manner due to the extruding processing. Meanwhile, the high voltage DC land cable can prevent the burns of the outer semi-conduction shielding layer and the insulating layer resulting from the high temperature during the extruding process of the metal sheath and avoid the mechanical force damage during the ripple-compacting process. Moreover, the high voltage DC land cable effectively inhibits the generation of the space charge and leads out the current.
Description
Technical field
The utility model relates to the power cable field, specifically is a kind of HVDC overland cable.
Background technology
Along with the continuous expansion of electric power system, the continuous increase of transmitted power, transmission distance increases gradually, and ac transmission runs into some technical bottlenecks gradually, and adopting direct current transportation is to solve one of direction of technology of transmission of electricity difficulty.Direct current transportation than ac transmission have transfer efficiency height, line loss little, regulate electric current and change that the power direction of transfer is convenient, investment cost is few, length do not receive capacitance current restriction, can be used as two kinds of electrical networks tie, can reduce advantages such as short circuit current, corona radio interference between backbone and electrical network is little.There is multinomial research to confirm that the space charge in the crosslinked polyethylene is the main cause that causes the early stage failure of insulation of cable.Space charge injects in the dielectric, causes the material internal electric field distortion, and finally causes the puncture of material, and insulating material lost efficacy.Problems with space charge in the dielectric has become the restriction power cable to one of principal element of high electric field development.
It is the structure that the high-voltage alternating of generally acknowledging or direct current cables must have that semiconductive shielding layer must be arranged between conductor and insulation, insulation and external shield; Semiconductive shielding layer is vital one deck in the middle and high piezoelectric forces cable; Semiconductive shielding layer plays the effect of uniform electric field; Can reduce the electric stress in the insulating barrier; Prevent stranded conductor and insulating surface generation corona discharge, prevent when short circuit to cause because of conductor is overheated the damage of insulation, the long-time running experience shows that semiconductive shielding layer also has significant impact useful life to cable.
China utility model patent CN201975152U discloses a kind of HVDC overland cable, comprises conductor, inner semiconductor layer, insulating barrier, out semiconductor layer, radial resistivity water layer, vertical water blocking layer, sheath.The structure of the structure of this patent and high-voltage alternating cable is basic identical, and the inner semiconductor layer of this patent is the interior semiconductive polymeric material that individual layer is extruded, because the conductor of cable is a lay configuration; Have the slit between the single line, particularly the slit of its conductive surface of electric cable with large cross-section conductor is bigger, cable inner semiconductor layer, insulating barrier, when out semiconductor layer is extruded; For the inner tight that makes material, do not produce bubble; Need bigger pressure, under pressure, inner semiconductor layer even insulation can be clamp-oned in the conductor; Simultaneously; Even the rough inner semiconductor layer insulating barrier that also can abrade on stranded conductor surface causes hidden danger of quality or directly causes puncture, the surface irregularity of inner semiconductor layer and insulation or quilt are abraded, and also are main causes that produces space charge.The out semiconductor layer of this patent is surrounded with radial resistivity water layer outward, and radial resistivity water layer is a single face semiconductive waterstop, can play radially resistance effect, also can, avoid that high temperature in the metallic sheath extrusion is scalded and the mechanical force damage during corrugating.The heavy in section high-tension cable of prior art also often is employed in the conductor method of wrapped semi-conductive tape outward.Outside conductor wrapped semi-conductive tape or outside out semiconductor layer wrapped semiconductive waterstop; Though can prevent that semiconductive shielding layer and insulating barrier are squeezed or quilt is abraded; Improve the roundness of conductor and the smoothness of semiconductive shielding layer; But wrapped structure adopts overlapping wrapped mode, though smoothness makes moderate progress but still can not satisfy the requirement of HVDC overland cable.Simultaneously; No matter be the semi-conductive tape or the semiconductive waterstop of which kind of material; All be to be processed by base material and semiconductive dyestuff, processing back semiconductive dyestuff becomes solid-state, in the production process of transportation, keeping and the cable of semi-conductive tape or semiconductive waterstop; Even this solid-state as easy as rolling off a log peeling off becomes Powderedly, peels off or pulverous semiconductive material equally also can influence the smoothness of semiconductive shielding layer.
The utility model content
The utility model technical problem to be solved provides a kind of not only effective derived current, can also neutralize space charge, and stop space charge to shift to insulator, and the HVDC overland cable of good combination property.
The described a kind of HVDC overland cable of the utility model comprises conductor, inner semiconductor layer, insulating barrier, out semiconductor layer, radial resistivity water layer, vertical water blocking layer and outer jacket from inside to outside; Between conductor and inner semiconductor layer, be extruded with auxiliary inner semiconductor layer.
The 60%-80% that said auxiliary inner semiconductor layer thickness is inner semiconductor layer thickness.
The improvement of the utility model the most is extruded with auxiliary out semiconductor layer between out semiconductor layer and radial resistivity water layer.Auxiliary out semiconductor layer thickness is the 60%-80% of out semiconductor layer thickness.
In the utility model, in auxiliary inner semiconductor layer that extrudes formation and auxiliary out semiconductor layer, surfacing, smooth; Do not have and peel off or Powdered; Can also play cushioning effect, can inner semiconductor layer even insulation clamp-oned in the conductor because of extruding processing; The rough of stranded conductor surface can not abrade inner semiconductor layer or insulating barrier yet; Also can not make out semiconductor layer and insulating barrier because the high temperature in the metallic sheath extrusion is scalded and the mechanical force damage during corrugating, thereby the office of making puts and the occurrence probability that punctures reduces, and has effectively suppressed the generation of space charge.Though inner semiconductor layer and out semiconductor layer specific insulation are higher relatively, because auxiliary inner semiconductor layer and auxiliary out semiconductor layer have lower specific insulation, effective derived current.Inner semiconductor layer and out semiconductor layer adopt the ultra-smooth shielding material, and be smooth with the contact-making surface of insulating barrier, also effectively suppressed the generation of space charge.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Like Fig. 1; The HVDC overland cable comprises conductor 1, the auxiliary inner semiconductor layer 2 that extrudes, inner semiconductor layer 3, insulating barrier 4, out semiconductor layer 5, the auxiliary out semiconductor layer 6 that extrudes, radial resistivity water layer 7, vertical water blocking layer 8 and outer jacket 9 from inside to outside.
Auxiliary inner semiconductor layer of the utility model and auxiliary out semiconductor layer; Adopt identical semi-conductive shielding material; Should have lower specific insulation, 20 ℃ of specific insulation≤5 Ω cm, its thickness is respectively the 60%-80% of inner semiconductor layer and out semiconductor layer.
Inner semiconductor layer and outer half electric screen layer adopt the ultra-smooth semi-conductive shielding material, should have higher specific insulation, 20 ℃ of specific insulation 20-100 Ω cm, and its thickness is 0.6-2mm according to the cross-sectional area of conductor size.
Conductor adopts and forms copper stranded pressing of single line, and cross section is a circular configuration.
Insulating barrier adopts the HVDC overland cable to use cross-linked polyethylene insulating material, with inner semiconductor layer and the extrusion molding of out semiconductor layer one-time continuous.
Radial resistivity water layer forms by the imbibition band is wrapped, can adopt the imbibition band with semiconductive characteristic.
Vertically water blocking layer can be pressed into the metallic sheath such as lead cover, aluminium cover of corrugated form or the aluminium-plastic tape of vertical bag crimping after extruding for employing.
Outer jacket can be polyvinyl chloride or polyethylene continuous extrusion.
Above-mentioned these execution modes only are used to explain the utility model; But do not limit the scope of the utility model; After having read the utility model, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the utility model.
Claims (4)
1. a HVDC overland cable comprises conductor (1), inner semiconductor layer (3), insulating barrier (4), out semiconductor layer (5), radial resistivity water layer (7), vertical water blocking layer (8) and outer jacket (9) from inside to outside; It is characterized in that, between conductor and inner semiconductor layer, be extruded with auxiliary inner semiconductor layer (2).
2. HVDC overland cable according to claim 1 is characterized in that, auxiliary inner semiconductor layer (2) thickness is the 60%-80% of inner semiconductor layer thickness.
3. HVDC overland cable according to claim 1 and 2 is characterized in that, between out semiconductor layer and radial resistivity water layer, is extruded with auxiliary out semiconductor layer (6).
4. HVDC overland cable according to claim 3 is characterized in that, auxiliary out semiconductor layer (6) thickness is the 60%-80% of out semiconductor layer thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204736463U CN202363162U (en) | 2011-11-24 | 2011-11-24 | High voltage DC land cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204736463U CN202363162U (en) | 2011-11-24 | 2011-11-24 | High voltage DC land cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202363162U true CN202363162U (en) | 2012-08-01 |
Family
ID=46574331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204736463U Expired - Lifetime CN202363162U (en) | 2011-11-24 | 2011-11-24 | High voltage DC land cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202363162U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112885513A (en) * | 2019-11-29 | 2021-06-01 | 广州番禺电缆集团有限公司 | Submersible pump cable and production process thereof |
-
2011
- 2011-11-24 CN CN2011204736463U patent/CN202363162U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112885513A (en) * | 2019-11-29 | 2021-06-01 | 广州番禺电缆集团有限公司 | Submersible pump cable and production process thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120801 |
|
| CX01 | Expiry of patent term |