CN101414495A - Composite power cable - Google Patents
Composite power cable Download PDFInfo
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- CN101414495A CN101414495A CNA2007100472500A CN200710047250A CN101414495A CN 101414495 A CN101414495 A CN 101414495A CN A2007100472500 A CNA2007100472500 A CN A2007100472500A CN 200710047250 A CN200710047250 A CN 200710047250A CN 101414495 A CN101414495 A CN 101414495A
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- power cable
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Abstract
A composite power cable sequentially comprises a conductor shielding layer, an insulating layer, an insulating layer shielding layer, a metal shielding layer and a sheath from a center conductor of the cable to the outside. The inside of the metal shielding layer and the outside of the insulating layer shielding layer are provided with two or more than two thin metal conductors which are parallel to a cable axis or are axially wound with an insulation protection layer. The composite power cable can be used in an online detection method of partial discharge of cables, and can reduce the influence of background noise and external interference noise on detection signals.
Description
Technical field
The present invention relates to cable, particularly a kind of composite power cable that is used to carry high pressure/extra-high voltage, 35 kilovolts to 500 kilovolts of electric pressures exchange or direct current.Composite power cable of the present invention is a kind of electromagnetic pulse or electromagnetic special cable that effective detection streamer partial discharge produces that be suitable for.
Background technology
In recent years,, caused supply of electric power very nervous, and caused a new round electric power investment construction climax, particularly crosslinked polyethylene (being designated hereinafter simply as XLPE) extra-high-tension cable and in the underground electrical network in city, be extensive use of because China's economy grows continuously and fast.
Both at home and abroad operating experience and achievement in research show: the early stage deterioration of XLPE power cable performance or depend on that the electric branch shape of XLPE dielectric is aging useful life to a great extent, and measurement of partial discharge is one of effective ways of quantitative analysis electric branch shape degradation, be that electric branch causes initial stage, the about 0.1pC (pC=10 of its partial discharge quantity
-12Coulomb) when electric branch developed into the dielectric breakdown critical condition, its partial discharge quantity reached about 1000pC.Therefore, it is in time to find potential faults that the partial discharge of cable insulation is carried out online detection, prediction service life, the important means of guarantee power cable safe and reliable operation.The XLPE cable measurement of partial discharge adopts the IEC60270 method more, but the measurement frequency band of this method is lower, arrives in the hundreds of kHz scope tens usually, is subject to the influence of ambient interferences, poor anti jamming capability.Up to now, the method that is used for the XLPE cable Partial Discharge Detection both at home and abroad has a lot; But because the XLPE cable local discharge signal is faint, waveform is complicated and changeable, very easily flooded, so the difficulty of research and development cable local discharge online measuring technique is maximum in all cable insulation online measuring techniques by background noise and outside electromagnetic interference noise.Therefore, exist sufficient reason to seek the relevant composite power cable of a kind of cable local discharge online test method, to reduce the influence of background noise and external interference noise to detection signal.
Summary of the invention
The objective of the invention is for the cable local discharge online test method provides a kind of composite power cable, to reduce the influence of background noise and external interference noise detection signal.
For achieving the above object, technical solution of the present invention is as follows:
A kind of composite power cable; comprise successively from the inside to the outside: center conductor, conductor shielding layer, insulating barrier; insulation shielding layer, metal shielding layer and crust; be characterized between described insulation shielding layer and metal shielding layer, being provided with the metal thin wire of the tape insulation protective layer more than two or two; be parallel to composite power cable axle or axially winding, in the total length of cable, distribute.
The conductor of the metal thin wire of described tape insulation protective layer is that the alloy of main component is made by copper, aluminium, steel or with them.
The metal thin wire quantity of described tape insulation protective layer is two, with the center symmetrical distribution of cable conductor.
The metal thin wire quantity of described tape insulation protective layer is three, and with the center symmetrical distribution of cable conductor, in the cross section of cable, any two lines with the conductor geometric center in them are 120 degree.
The metal thin wire quantity of described tape insulation protective layer is four, with the central shaft symmetrical distribution of cable conductor.In the cross section of cable, two lines with the conductor geometric center that close in them are 90 degree.
Technique effect of the present invention:
The metal thin wire of composite power cable of the present invention can go out pulse current by inductive coupling in the pulse electromagnetic environment that the inner partial discharge of this cable produces.Metal thin wire energy scattering electromagnetic wave, meanwhile the electromagnetism wave energy causes electric current in the metal thin wire.Hence one can see that, placed metal thin wire in the electromagnetic pulse environment that the power cable partial discharge causes, can go out pulse current by inductive coupling, this inductive impulse electric current is a kind of attenuated oscillation, the reason that this phenomenon occurs mainly is to cause the electric charge accumulation owing to electric current on the lead flows, the field that the electric charge accumulation forms causes electric current, such cyclic process, simultaneous irradiation of electromagnetic waves again.
The present invention places the metal thin wire that is parallel to cable axle or the axial tape insulation protective layer that twines more than two or two in metal shielding layer inboard, the insulation shielding layer outside of high pressure/ultrahigh voltage power cable; have small curvature radius, do not destroy the insulation in the cable.The metal thin wire of these tape insulation protective layers adds cable as the sensing element of detection streamer partial discharge in the manufacture process of cable.At the erection stage of cable, they are drawn from the joint of cable.In the operation phase of cable, electromagnetic pulse or ripple that the inner partial discharge of cable produces can produce induced voltage between the leading-out end of the metal thin wire of these tape insulation protective layers.These metal thin wires, by suitable wiring, can with an electrical signal detection and processing unit, constitute the means of a cable local discharge horizontal detection.Our experiments show that, when electromagnetic pulse that produces when the inner partial discharge of cable or electromagnetic wave, can on the metal thin wire of these tape insulation protective layers, go out pulse current by inductive coupling, by electrical signal detection and processing unit, can the detection streamer local discharging level.
Description of drawings
Fig. 1 is the cutaway view of composite power cable embodiment 1 of the present invention.
Fig. 2 is the cutaway view of the metal thin wire of tape insulation protective layer in the composite power cable of the present invention.
Fig. 3 is the cutaway view of composite power cable embodiment 2 of the present invention.
Fig. 4 is the cutaway view of composite power cable embodiment 3 of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
Embodiment 1
Fig. 1 is the cutaway view of composite power cable embodiment 1 of the present invention.As seen from the figure; this composite power cable comprises center conductor 1, conductor shielding layer 2, insulating barrier 3, insulation shielding layer 4, metal shielding layer 5 and crust 6, and the metal thin wire 10 that places the tape insulation protective layer in described metal shielding layer 5 inboards, these insulation shielding layer 4 outsides.
Center conductor 1 will be transferred to electric equipment from the electric current guiding of transformer station, and when high pressure was applied to this center conductor 1, conductor shielding layer 2 and insulation shielding layer 4 played the effect that prevents that high electric field from assembling.In addition, insulating barrier 3 prevents dielectric breakdown.
Consult Fig. 2; the metal thin wire 10 of this tape insulation protective layer is made of plain conductor 11 and insulating protective layer 12; the metal thin wire 10 of two tape insulation protective layers is symmetrically distributed between described insulation shielding layer 4 of cable and the metal shielding layer 5 with the geometric center of described composite power cable, and along the longitudinal extension of cable.
Metal shielding layer 5 can be made by aluminium sheath, copper sheath, stainless steel sheath or lead sheath etc.Especially preferred is corrugated aluminium sheath or lead sheath.In addition, crust 6 forms such as plastic materials such as polyethylene by extruding on metal shielding layer 5.
Fig. 3 is the cutaway view of composite power cable embodiment 2 of the present invention.This embodiment is similar to embodiment 1; be that cable comprises center conductor 1, conductor shielding layer 2, insulating barrier 3, insulation shielding layer 4, metal shielding layer 5 and crust 6, and the metal thin wire 10 that places the tape insulation protective layer between this insulation shielding layer and this metal shielding layer.Compare with embodiment 1, specifically, the metal thin wire 10 of three tape insulation protective layers is arranged in the present embodiment, be symmetrically distributed with the cable geometric center, 120 degree of being separated by between the metal thin wire 10 of any two tape insulation protective layers, and along the longitudinal extension of cable.
Fig. 4 is the cutaway view of composite power cable embodiment 3 of the present invention.This embodiment is similar with embodiment 2 to embodiment 1; be that cable comprises center conductor 1, conductor shielding layer 2, insulating barrier 3, insulation shielding layer 4, metal shielding layer 5 and crust 6, and the metal thin wire 10 that places the tape insulation protective layer between this insulation shielding layer and this metal shielding layer.Characteristics are totally four of metal thin wires of tape insulation protective layer, and the metal thin wire 10 of four tape insulation protective layers is symmetrically distributed with the cable geometric center, 90 degree of being separated by between the metal thin wire of adjacent two tape insulation protective layers, and along the longitudinal extension of cable.
Show that through on probation composite power cable of the present invention can be cable local discharge and is provided at the line detecting method use, can reduce the influence to detection signal of background noise and external interference noise.
Claims (7)
1, a kind of composite power cable; comprise successively from the inside to the outside: center conductor, conductor shielding layer, insulating barrier; insulation shielding layer, metal shielding layer and crust; it is characterized in that between described insulation shielding layer and metal shielding layer, being provided with the metal thin wire of the tape insulation protective layer more than two or two; be parallel to composite power cable axle or axially winding, in the total length of cable, distribute.
2, composite power cable according to claim 1 is characterized in that the conductor of the metal thin wire of described tape insulation protective layer is that the alloy of main component is made by copper, aluminium, steel or with them.
3, composite power cable according to claim 1 is characterized in that the metal thin wire quantity of described tape insulation protective layer is two, with the center symmetrical distribution of cable conductor.
4, composite power cable according to claim 1; the metal thin wire quantity that it is characterized in that described tape insulation protective layer is three; center with cable conductor is symmetrically distributed, and in the cross section of cable, any two lines with the conductor geometric center in them are 120 degree.
5, composite power cable according to claim 1; the metal thin wire quantity that it is characterized in that described tape insulation protective layer is four; central shaft with cable conductor is symmetrically distributed, and in the cross section of cable, two lines with the conductor geometric center that close in them are 90 degree.
6, according to each described composite power cable of claim 1 to 5, it is characterized in that described metal shielding layer (5) is made of aluminium sheath, copper sheath, stainless steel sheath or lead sheath,
7, composite power cable according to claim 6 is characterized in that described metal shielding layer (5) is corrugated aluminium sheath or lead sheath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710047250A CN101414495B (en) | 2007-10-19 | 2007-10-19 | Composite power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710047250A CN101414495B (en) | 2007-10-19 | 2007-10-19 | Composite power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101414495A true CN101414495A (en) | 2009-04-22 |
| CN101414495B CN101414495B (en) | 2010-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710047250A Active CN101414495B (en) | 2007-10-19 | 2007-10-19 | Composite power cable |
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| CN (1) | CN101414495B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103035329A (en) * | 2012-11-26 | 2013-04-10 | 晶锋集团股份有限公司 | Anti-interference composite wire cable |
| CN103779016A (en) * | 2014-01-16 | 2014-05-07 | 安徽国华电缆集团有限公司 | Anti-interference power cable |
| CN109920601A (en) * | 2019-03-22 | 2019-06-21 | 广西电网有限责任公司桂林供电局 | A kind of power cable suitable for Partial Discharge Detection positioning |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3474189A (en) * | 1967-12-22 | 1969-10-21 | Anaconda Wire & Cable Co | Electric power cable |
| US5527995A (en) * | 1994-08-03 | 1996-06-18 | The Okonite Company | Cable for conducting energy |
| CN1293575C (en) * | 2001-04-20 | 2007-01-03 | 河北宝丰线缆有限公司 | 35 KV XLPE insulating low-smoke halogen-free class A flame=retardent power cable |
| CN200941321Y (en) * | 2006-08-29 | 2007-08-29 | 张凤林 | Shielded monitoring insulated power cable for mine |
-
2007
- 2007-10-19 CN CN200710047250A patent/CN101414495B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103035329A (en) * | 2012-11-26 | 2013-04-10 | 晶锋集团股份有限公司 | Anti-interference composite wire cable |
| CN103779016A (en) * | 2014-01-16 | 2014-05-07 | 安徽国华电缆集团有限公司 | Anti-interference power cable |
| CN109920601A (en) * | 2019-03-22 | 2019-06-21 | 广西电网有限责任公司桂林供电局 | A kind of power cable suitable for Partial Discharge Detection positioning |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101414495B (en) | 2010-05-19 |
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Application publication date: 20090422 Assignee: Pinghu Bohui Communication Technology Co., Ltd. Assignor: Shanghai Bohui Communication Technology Co., Ltd. Contract record no.: 2013310000028 Denomination of invention: Application of composite power cable outdoor terminal with optical fiber arranged in center of conductor Granted publication date: 20100519 License type: Exclusive License Record date: 20130401 |
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Owner name: PINGHU BOHUI COMMUNICATION TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SHANGHAI BOHUI COMMUNICATION TECHNOLOGY CO., LTD. Effective date: 20130613 |
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Free format text: CORRECT: ADDRESS; FROM: 201204 PUDONG NEW AREA, SHANGHAI TO: 314299 JIAXING, ZHEJIANG PROVINCE |
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Effective date of registration: 20130613 Address after: 314299, Pinghu Jiaxing Economic Development Zone, Zhejiang Province, 988 emerging two road, the first floor of the first floor of the north side of the building Patentee after: Pinghu Bohui Communication Technology Co., Ltd. Address before: 201204 Shanghai city Pudong New Area road 289 Lane No. 3 in 5 Patentee before: Shanghai Bohui Communication Technology Co., Ltd. |