CN102480116A - Prefabricated joint for high-voltage direct-current cross-linked polyethylene cable - Google Patents
Prefabricated joint for high-voltage direct-current cross-linked polyethylene cable Download PDFInfo
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- CN102480116A CN102480116A CN2010105547721A CN201010554772A CN102480116A CN 102480116 A CN102480116 A CN 102480116A CN 2010105547721 A CN2010105547721 A CN 2010105547721A CN 201010554772 A CN201010554772 A CN 201010554772A CN 102480116 A CN102480116 A CN 102480116A
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- polyethylene cable
- stress cone
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- 229920003020 cross-linked polyethylene Polymers 0.000 title abstract description 10
- 239000004703 cross-linked polyethylene Substances 0.000 title abstract description 10
- 230000005684 electric field Effects 0.000 claims abstract description 26
- 238000009417 prefabrication Methods 0.000 claims description 33
- 239000004698 Polyethylene Substances 0.000 claims description 30
- -1 polyethylene Polymers 0.000 claims description 30
- 229920000573 polyethylene Polymers 0.000 claims description 30
- 238000009413 insulation Methods 0.000 claims description 25
- 229920002943 EPDM rubber Polymers 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 20
- 239000004065 semiconductor Substances 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 9
- 238000004513 sizing Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 12
- 238000009826 distribution Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000012212 insulator Substances 0.000 abstract 3
- 230000004888 barrier function Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention discloses a prefabricated joint for a high-voltage direct-current cross-linked polyethylene cable, belonging to the field of high-voltage direct-current power transmission of an electric system. The prefabricated joint comprises a high-voltage shielding layer, an external semi-conductive shielding layer and a reinforced insulator, wherein the external semi-conductive shielding layer is formed outside the high-voltage shielding layer; the reinforced insulator is clamped between the high-voltage shielding layer and the external semi-conductive shielding layer; an interface between the external semi-conductive shielding layer and the reinforced insulator is a stress cone; and the distance between the end part of the high-voltage shielding layer and the root part of the stress cone is an internal creeping distance. In the prefabricated joint for the high-voltage direct-current cross-linked polyethylene cable disclosed by the invention, electric field distribution is optimized, and the interface has sufficient safety margin; and the prefabricated joint has the advantages of light weight, small size, simple structure and the like, and has an important popularization value in the field of power transmission of high-voltage direct-current cross-linked polyethylene cables in electric systems.
Description
Technical field
The present invention relates to electric power system high-voltage dc transmission electrical domain; Relate in particular to a kind of joint of cooperation HVDC twisted polyethylene cable use of electric power system high-voltage dc transmission electrical domain, it is a kind of direct current twisted polyethylene cable prefabrication type joint of mesohigh grade.
Background technology
Since the 1st high voltage direct current transmission interconnection that connects between Gothland and the Sweden continent put into commercial operation in the world in 1954, high voltage dc transmission technology had obtained great development.But also there are a lot of shortcomings in traditional high voltage dc transmission technology: the investment of current conversion station is big, and the phase shift converter wiring is complicated, and is bulky, is prone to commutation failure takes place, and change of current voltage harmonic content is high.To the deficiency of conventional high-tension direct current transportation technology, ABB AB has researched and developed the flexible high pressure DC transmission system.Flexible high pressure direct current transportation technology is based on a kind of novel high-pressure direct current transportation technology that is applicable to the low capacity transmission of electricity of voltage source converter (VSC) and igbt (IGBT).From in March, 1997, the 1st flexible high pressure direct current transportation test macro---since the successful operation of Hellsjon-Grangesberg engineering, flexible high pressure direct current transportation technology has caused the extensive concern of various countries in the world.In succession in Australia, Denmark, states such as the U.S. have built up the flexible high pressure DC transmission engineering, and this has greatly promoted the development of flexible high pressure direct current transportation technology.
What the transmission line of flexible high pressure direct current transportation technology adopted is to be the plastic cable of insulation with the polymer.Crosslinked polyethylene (XLPE) is with its superior performance and the successful utilization on the high-voltage alternating cable and become the first-selection of direct current plastic cable insulating material.Yet; When crosslinked polyethylene insulation material is applied in high direct voltage following time, can be because fault in material, ionic dissociation; Electric charge injections etc. are former thereby at a large amount of space charge of insulating barrier accumulated inside; The existence of this space charge internal field in the insulating barrier that may greatly distort, and then cause the damage of insulating, finally cause cable system operation failure.The various countries scholar forms mechanism and braking measure and has done a large amount of work for the measurement of space electric charge in the research polymer, has obtained a lot of valuable cross-linking polyethylene materials prescriptions.
Electric cable accessories is stube cable and cable or cable and the indispensable element of other power equipments.Different with cable body is, there is the double hyer insulation medium in electric cable accessories in (comprising transition joint and terminal), and the existence of this interface accumulation space electric charge more easily.Space charge amount on the two-layered medium interface is mainly determined by the dielectric constant ratio and the difference between conductivity ratio of each layer insulating material; Difference is big more, and the space charge that then gathers is just big, otherwise; Both relatively near the time, the space charge that gathers is just little even eliminate.Under different temperatures different electric field intensity; The change in dielectric constant of material is very little; The dielectric constant ratio that is to say two kinds of materials is basic fixed, and marked change reaches the variation of several magnitude sometimes but conductivity of electrolyte materials is but along with the variation of temperature and electric field strength.The cable joint of ABB AB is between crosslinked polyethylene and ethylene propylene diene rubber, to add the stress control layer that one deck has nonlinear characteristic.This key-course guarantees that under different temperatures the dielectric constant ratio on two interfaces is consistent with conductivity ratio, thereby reduces the space charge at interface.Yet the difficulty of researching and developing such non-linear stress key-course is very big, and makes the structure complicated of direct current plastic cable joint.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and a kind of HVDC twisted polyethylene cable prefabrication type joint is provided, it has simple in structure, and volume is little, and the advantage that consumptive material is few is few with the space charge that accumulates on the cable interface.
The technical scheme that realizes above-mentioned purpose is: a kind of HVDC twisted polyethylene cable prefabrication type joint; Wherein, The employed electric pressure of described prefabrication type joint comprises the mesohigh grade; This prefabrication type joint comprises the high-tension shielding layer, is arranged at the outer out semiconductor layer of high-tension shielding layer, is located in the reinforced insulation between high-tension shielding layer and the out semiconductor layer; The interface of said out semiconductor layer and reinforced insulation is a stress cone, and said high-tension shielding layer end is interior creep distance to the distance of said stress cone root.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, semicircular structure is adopted in described high-tension shielding layer end, adopts EPDM semiconductive sizing material.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, described reinforced insulation adopts ethylene propylene diene monomer (EPDM) material.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, the tangential electric field strength that described interior creep distance place allows is 0.6kV/mm, design margin is 100%.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, described stress cone shape adopts full arc type structure.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, the stress cone shape of described full arc type structure meets Bezier three times, and starting point is the stress cone root, and terminal point is the stress cone end, and direction point is on camber line.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, the direction point on the described camber line is fixing point not.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, the stress cone length of described full arc type structure is foundation with actual measurement interface shape electric charge, concrete structure size and electric pressure.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, described out semiconductor layer adopts EPDM semiconductive sizing material.
Above-mentioned HVDC twisted polyethylene cable prefabrication type joint, wherein, the scope of described mesohigh electric pressure is that 10kV is to 150kV.
The invention has the beneficial effects as follows: the Electric Field Distribution in the HVDC twisted polyethylene cable prefabrication type joint among the present invention reaches optimum; The interface has enough margins of safety; And in light weight, volume is little; Simple in structure, have important promotional value in electric power system HVDC twisted polyethylene cable field of power transmission.
Description of drawings
Fig. 1 is the structural representation of HVDC twisted polyethylene cable prefabrication type joint of the present invention;
Fig. 2 is the conductivity map of ethylene propylene diene monomer (EPDM) material under different temperatures, different electric field intensity that is adopted;
Fig. 3 is stress cone shape figure;
Fig. 4 is crosslinked polyethylene and the interface shape charge pattern of ethylene propylene diene monomer (EPDM) material under design electric field strength;
Fig. 5 is preparation joint and the axial tangential of cable main insulation interface electric-field intensity distribution figure;
Fig. 6 is an axial electric field intensity distribution on the stress cone curve;
Fig. 7 is an electric field strength mould value distribution map on the stress cone curve.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
See also Fig. 1 to Fig. 7; A kind of HVDC twisted polyethylene cable prefabrication type joint of the present invention has been shown among the figure; The employed electric pressure of prefabrication type joint comprises the mesohigh grade; This prefabrication type joint comprises high-tension shielding layer 1, be arranged at the outer out semiconductor layer 5 of high-tension shielding layer 1, be located in the reinforced insulation 2 between high-tension shielding layer 1 and the out semiconductor layer 5; Out semiconductor layer 5 is a stress cone 4 with the interface of reinforced insulation 2, and high-tension shielding layer 1 end is interior creep distance 3 to the distance of stress cone 4 roots.
High-tension shielding layer 1 adopts EPDM semiconductive sizing material, and its conductivity is 2 * 10
-3S/m, high-tension shielding layer end semicircular in shape, thickness is 5mm, Design of length needs to guarantee that with reference to GB 14315-93 high-tension shielding layer 1 two ends and the cable main insulation lap of splice are all greater than 10mm;
Reinforced insulation 2 adopts ethylene propylene diene monomer (EPDM) material; Its glass transition temperature is about-43 ℃; Its conductivity under different temperatures, different electric field intensity is as shown in Figure 2, and its thickness is decided according to concrete electric pressure, and the average field intensity design load when normally moving is 3kV/mm; Can confirm suitably to amplify the thickness of reinforced insulation by electric pressure and average field intensity.
Stress taper 4 shapes adopt full arc type structure; Stress cone 4 shapes of full arc type structure meet Bezier three times, and starting point is the stress cone root, and terminal point is the stress cone end; Direction point is on camber line; Direction point is fixing point not, is benchmark to satisfy optimum Electric Field Distribution, and stress cone 4 length are foundation with actual measurement interface shape electric charge, concrete structure size and electric pressure.Stress cone 4 its length among the present invention are calculated according to formula (1):
In the formula, ε
1, ε
2Be respectively the dielectric constant of crosslinked polyethylene and ethylene propylene diene monomer (EPDM) material; U is the electric pressure of cable system; r
1, r
i, r
2Be respectively cable main insulation inside radius, double hyer insulation interface place's radius and transition joint reinforced insulation outer radius; ρ (r) is the space charge at diverse location point place in the insulating barrier; E
tTangential electric field strength value for the permission on stress cone 4 and the cable main insulation interface is 0.6kV/mm.
Out semiconductor layer 5 adopts EPDM semiconductive sizing material, and its conductivity is 2 * 10
-3S/m, its thickness are 3mm.
The scope of the mesohigh electric pressure among the present invention is that 10kV is to 150kV.
High-tension shielding layer 1 among the present invention, reinforced insulation 2, out semiconductor layer 5 according to the perfect mould of design at factory's single injection-molded, thereby creep distance 3 and stress cone 4 in forming.
To lift an embodiment below describes.
Be ± 30kV that the cable core sectional area is 300mm with the design fits electric pressure
2, main insulation thickness is that the joint that the cable of 4mm uses is example.
It is 2 * 10 that high-tension shielding layer 1 adopts conductivity
-3The EPDM semiconductive sizing material of S/m, end adopt semicircular structure, and thickness is 5mm, and length is according to GB 14315-93, and guarantee that high-tension shielding layer 1 and the cable main insulation lap of splice greater than 10mm, can confirm as 160mm.
Reinforced insulation 2 adopts conductivity ethylene propylene diene monomer (EPDM) material as shown in Figure 2, and its THICKNESS CALCULATION value is 30kV/3kV/mm=10mm, and for the purpose of conservative, its thickness is scalable to be 12mm.
B(t)＝P
0(1-t)
3+3P
1t(1-t)
2+3P
2t
2(1-t)+P
3t
3，t∈[0，1] (2)
In the formula, B (t) is a curve shape, and t is a parameter.Stress cone length is according to interface shape charge pattern shown in Figure 4, substitution formula (1), and can calculate stress cone length is 68mm.
It is 2 * 10 that out semiconductor layer 5 adopts conductivity
-3The EPDM semiconductive sizing material of S/m, thickness is 3mm.
Behind the global formation, preparation joint and the axial tangential of cable main insulation interface electric-field intensity distribution figure are as shown in Figure 5; The axial electric field intensity distribution is as shown in Figure 6 on the stress cone curve; Electric field strength mould value distribution map is as shown in Figure 7 on the stress cone curve.The Electric Field Distribution that satisfies condition is according to being: 1. preparation joint and the axial tangential of cable main insulation interface electric field strength value are no more than 1.5kV/mm near the high-tension shielding layer end; 2. stress cone and cable main insulation interface tangential electric field strength are no more than 0.6kV/mm, and relatively evenly; 3. the axial electric field intensity level is no more than 0.6kV/mm on the stress cone curve, and relatively evenly; 4. the electric field strength mould value of stress cone curve root is maximum, the trend that from the root to the end, tapers off, and the electric field strength mould value of stress cone root is no more than 3kV/mm.
That HVDC twisted polyethylene cable prefabrication type structure among the present invention has is in light weight, volume is little, insulating barrier Electric Field Distribution situation reaches optimum characteristics.
Claims (10)
1. HVDC twisted polyethylene cable prefabrication type joint; It is characterized in that; The employed electric pressure of described prefabrication type joint comprises the mesohigh grade; This prefabrication type joint comprises the high-tension shielding layer, is arranged at the outer out semiconductor layer of high-tension shielding layer, is located in the reinforced insulation between high-tension shielding layer and the out semiconductor layer; The interface of said out semiconductor layer and reinforced insulation is a stress cone, and said high-tension shielding layer end is interior creep distance to the distance of said stress cone root.
2. HVDC twisted polyethylene cable prefabrication type joint according to claim 1 is characterized in that, semicircular structure is adopted in described high-tension shielding layer end, adopts EPDM semiconductive sizing material.
3. HVDC twisted polyethylene cable prefabrication type joint according to claim 1 is characterized in that, described reinforced insulation adopts ethylene propylene diene monomer (EPDM) material.
4. HVDC twisted polyethylene cable prefabrication type joint according to claim 1 is characterized in that, the tangential electric field strength that described interior creep distance place allows is 0.6kV/mm, and design margin is 100%.
5. HVDC twisted polyethylene cable prefabrication type joint according to claim 1 is characterized in that, described stress cone shape adopts full arc type structure.
6. HVDC twisted polyethylene cable prefabrication type joint according to claim 5; It is characterized in that the stress cone shape of described full arc type structure meets Bezier three times, starting point is the stress cone root; Terminal point is the stress cone end, and direction point is on camber line.
7. HVDC twisted polyethylene cable prefabrication type joint according to claim 6 is characterized in that, the direction point on the described camber line is fixing point not.
8. HVDC twisted polyethylene cable prefabrication type joint according to claim 5 is characterized in that, the stress cone length of described full arc type structure is foundation with actual measurement interface shape electric charge, concrete structure size and electric pressure.
9. HVDC twisted polyethylene cable prefabrication type joint according to claim 1 is characterized in that, described out semiconductor layer adopts EPDM semiconductive sizing material.
10. HVDC twisted polyethylene cable prefabrication type joint according to claim 1 is characterized in that the scope of described mesohigh electric pressure is that 10kV is to 150kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105547721A CN102480116A (en) | 2010-11-23 | 2010-11-23 | Prefabricated joint for high-voltage direct-current cross-linked polyethylene cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105547721A CN102480116A (en) | 2010-11-23 | 2010-11-23 | Prefabricated joint for high-voltage direct-current cross-linked polyethylene cable |
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|---|---|
| CN102480116A true CN102480116A (en) | 2012-05-30 |
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|---|---|---|---|
| CN2010105547721A Pending CN102480116A (en) | 2010-11-23 | 2010-11-23 | Prefabricated joint for high-voltage direct-current cross-linked polyethylene cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782080A (en) * | 2019-01-08 | 2019-05-21 | 国网天津市电力公司电力科学研究院 | A kind of cable insulation space charge signal wireless transmission system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201075655Y (en) * | 2007-07-30 | 2008-06-18 | 北京国电四维电力技术有限公司 | Integral prefabricated type middle joint |
| JP2009100592A (en) * | 2007-10-18 | 2009-05-07 | Viscas Corp | Power cable joint |
| CN201383665Y (en) * | 2009-04-08 | 2010-01-13 | 温州天诚电力设备有限公司 | Elbow type cable connector |
-
2010
- 2010-11-23 CN CN2010105547721A patent/CN102480116A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201075655Y (en) * | 2007-07-30 | 2008-06-18 | 北京国电四维电力技术有限公司 | Integral prefabricated type middle joint |
| JP2009100592A (en) * | 2007-10-18 | 2009-05-07 | Viscas Corp | Power cable joint |
| CN201383665Y (en) * | 2009-04-08 | 2010-01-13 | 温州天诚电力设备有限公司 | Elbow type cable connector |
Non-Patent Citations (2)
| Title |
|---|
| 顾金: "柔性高压直流交联聚乙烯（XLPE）电缆及其附件的设计研究", 《中国优秀硕士学位论文全文数据库》, no. 11, 15 November 2010 (2010-11-15) * |
| 顾金等: "《高压直流XLPE电力电缆预制式接头的设计》", 《高电压技术》, vol. 35, no. 12, 31 December 2009 (2009-12-31), pages 3159 - 3163 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782080A (en) * | 2019-01-08 | 2019-05-21 | 国网天津市电力公司电力科学研究院 | A kind of cable insulation space charge signal wireless transmission system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI JIAOTONG UNIVERSITY SHANGHAI JIEJIN NEW E Free format text: FORMER OWNER: SHANGHAI JIAOTONG UNIVERSITY SHANGHAI JIEJIN NEW ELECTRIC MATERIAL CO., LTD. SHANGHAIHUAPU CABLE CO., LTD. Effective date: 20121022 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20121022 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant after: Shanghai Electric Power Corporation Applicant after: Shanghai Jiao Tong University Applicant after: Shanghai Jiejin Electric Power New Materials Co., Ltd. Applicant after: Shanghai Huapu Cable Co., Ltd. Applicant after: State Grid Corporation of China Address before: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant before: Shanghai Electric Power Corporation Applicant before: Shanghai Jiao Tong University Applicant before: Shanghai Jiejin Electric Power New Materials Co., Ltd. Applicant before: Shanghai Huapu Cable Co., Ltd. |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120530 |