CN108666963B - Electric field stress control method of special silicone rubber for 220kV cable terminal accessories - Google Patents
Electric field stress control method of special silicone rubber for 220kV cable terminal accessories Download PDFInfo
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- CN108666963B CN108666963B CN201810442853.9A CN201810442853A CN108666963B CN 108666963 B CN108666963 B CN 108666963B CN 201810442853 A CN201810442853 A CN 201810442853A CN 108666963 B CN108666963 B CN 108666963B
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- electric field
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- 230000005684 electric field Effects 0.000 title claims abstract description 16
- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000004945 silicone rubber Substances 0.000 title claims abstract description 9
- 238000009826 distribution Methods 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 4
- 229920001971 elastomer Polymers 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- -1 aluminum silver Chemical compound 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- YCKOAAUKSGOOJH-UHFFFAOYSA-N copper silver Chemical compound [Cu].[Ag].[Ag] YCKOAAUKSGOOJH-UHFFFAOYSA-N 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/06—Cable terminating boxes, frames or other structures
- H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
- H02G15/068—Cable terminating boxes, frames or other structures with devices for relieving electrical stress connected to the cable shield only
Landscapes
- Cable Accessories (AREA)
Abstract
本发明涉及一种220kV电缆终端附件的特种硅橡胶电场应力控制方法，该控制方法通过喇叭型应力锥的控制来实现，所述应力锥包括导电部以及与导电部同轴设置的绝缘部，所述的导电部设置有中心孔，在该导电部的从前至后包括依次连接的第一圆弧段、第一圆柱段、第二圆弧段、第二圆柱段、第三圆弧段、第三圆柱段、圆锥段、第四圆柱段和第四弧形段；所述中心孔的前部设置有第五弧形段，后部形成喇叭口状，该喇叭口的扩口端接近所述的第四弧形段；该导电部由导电硅橡胶制成。本发明的优点是：将电缆外屏蔽切断处的集中电场均匀分布，其绝缘结构设计合理，基本不受外界因素影响，稳定性较好。
The invention relates to a special silicone rubber electric field stress control method for 220kV cable terminal accessories. The control method is realized by the control of a horn-shaped stress cone. The stress cone includes a conductive part and an insulating part arranged coaxially with the conductive part. The conductive part is provided with a central hole, and the conductive part includes a first circular arc segment, a first cylindrical segment, a second circular arc segment, a second cylindrical segment, a third circular arc segment, a first circular arc segment, a Three cylindrical sections, a conical section, a fourth cylindrical section and a fourth arc section; the front part of the central hole is provided with a fifth arc section, and the rear part is shaped like a bell mouth, and the flared end of the bell mouth The fourth arc segment; the conductive part is made of conductive silicone rubber. The advantages of the invention are that the concentrated electric field at the cut-off place of the outer shield of the cable is evenly distributed, the design of the insulation structure is reasonable, it is basically not affected by external factors, and the stability is good.
Description
Technical Field
The invention relates to a special silicon rubber electric field stress control method for 220kV cable terminal accessories.
Background
Due to the need to cut off the metal sheath, the shielding layer and the insulating layer in the manufacture of the XLPE power cable accessory with the voltage class of 220kV, the change of the geometry and the cross section of the continuous part of the conductor, and the difference of the dielectric coefficient and the thickness of the supplementary insulation and the additional insulation and the insulation material of the cable body, the electric field distribution at the cable accessory is greatly changed compared with the cable body.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a special silicon rubber electric field stress control method for 220kV cable terminal accessories, and the technical scheme of the invention is as follows:
the control method is realized by controlling a horn-shaped stress cone, the stress cone comprises a conductive part and an insulating part coaxially arranged with the conductive part, the conductive part is provided with a center hole, and the conductive part comprises a first arc section, a first cylindrical section, a second arc section, a second cylindrical section, a third arc section, a third cylindrical section, a cone section, a fourth cylindrical section and a fourth arc section which are sequentially connected from front to back; the front part of the central hole is provided with a fifth arc-shaped section, the rear part of the central hole is in a bell mouth shape, and the flared end of the bell mouth is close to the fourth arc-shaped section; the conductive portion is made of conductive silicone rubber.
And the insulating part is provided with a slot for accommodating the fourth cylindrical section and the fourth arc-shaped section.
The diameter of the central hole is 60mm, the length of the central hole is 113.5mm, the radiuses of the first arc-shaped section, the second arc-shaped section, the third arc-shaped section and the fifth arc-shaped section are all 3.5mm, the wall thickness of the first cylindrical section is 15mm, and the length of the first cylindrical section is 30 mm; the length of the second cylindrical section is 14mm, and the axial lengths of the second arc-shaped section and the third arc-shaped section are both 6 mm; the conductive part has an overall length of 190 mm.
The invention has the advantages that: the concentrated electric field at the cut-off position of the outer shielding of the cable is uniformly distributed, the insulating structure is reasonable in design, the cable is basically not influenced by external factors, and the stability is good.
Drawings
Fig. 1 is a schematic view of the main structure of the present invention.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Referring to fig. 1, the invention relates to a special silicon rubber electric field stress control method of a 220kV cable terminal accessory, which is realized by controlling a horn-shaped stress cone, wherein the stress cone comprises a conductive part and an insulating part (not shown) coaxially arranged with the conductive part, the conductive part is provided with a central hole 10, and the conductive part comprises a first arc section 1, a first cylindrical section 2, a second arc section 3, a second cylindrical section 4, a third arc section 9, a third cylindrical section, a conical section 5, a fourth cylindrical section 6 and a fourth arc section 7 which are sequentially connected from front to back; the front part of the central hole 10 is provided with a fifth arc-shaped section 11, the rear part of the central hole forms a bell mouth shape, and the flared end of the bell mouth 8 is close to the fourth arc-shaped section 7; the conductive portion is made of conductive silicone rubber.
And the insulating part is provided with a slot for accommodating the fourth cylindrical section 6 and the fourth arc-shaped section 7.
The diameter of the central hole is 60mm, the length of the central hole is 113.5mm, the radiuses of the first arc-shaped section, the second arc-shaped section, the third arc-shaped section and the fifth arc-shaped section are all 3.5mm, the wall thickness of the first cylindrical section is 15mm, and the length of the first cylindrical section is 30 mm; the length of the second cylindrical section is 14mm, and the axial lengths of the second arc-shaped section and the third arc-shaped section are both 6 mm; the conductive part has an overall length of 190 mm.
When the cable is applied, the cable is fixed at the cut-off position of the cable arranging accessory, the center hole (the end far away from the bell mouth) of the conductive part faces the cut-off position of the cable, the center hole is sleeved outside the exposed shielding layer, and the insulating part is sleeved outside the insulating layer which is exposed at the cut-off position and wrapped outside the core wire. According to the invention, the cut-off part of the insulating and shielding layer of the power cable is extended, so that the zero potential forms a horn shape, and the electric field distribution of the insulating and shielding layer is improved.
The stress cone is not installed, the electric field distribution at the shielding fracture of the cable is very uneven, all the electric field stress distribution is completely concentrated at the shielding fracture, and the power cable is very easy to break down if the power cable directly runs in the state. After the invention is installed, the electric field stress 8 is distributed very uniformly, and the power cable can normally run in the state.
The conductive part 1 is made of conductive silicone rubber (prior art), and its high elasticity makes the accessory better fit the surface of the core insulation layer of the cable and form a permanent vacuum on the interface, ensuring the electrical properties of the interface. The conductive silicone rubber is a common shielding material, is a novel modified polymer material which is prepared by filling fine conductive particles (such as one of aluminum silver plating, copper silver plating, carbon black, pure silver and graphite) in the silicone rubber, and has excellent electrical property and shielding property and good physical and mechanical properties. The network structure of the polymer chain formed after crosslinking provides physical and mechanical properties with rubber characteristics, such as rebound resilience, compression performance and the like; the three-dimensional conductive network formed by the close packing of the conductive particles within the rubber network provides the electrical and shielding properties required for the product.
Claims (2)
- The special silicon rubber electric field stress control method of the 1.220kV cable terminal accessory is characterized in that the control method is realized by controlling a horn-shaped stress cone, the stress cone comprises a conductive part and an insulating part coaxially arranged with the conductive part, the conductive part is provided with a center hole, and the conductive part comprises a first arc section, a first cylindrical section, a second arc section, a second cylindrical section, a third arc section, a third cylindrical section, a cone section, a fourth cylindrical section and a fourth arc section which are sequentially connected from front to back; the front part of the central hole is provided with a fifth arc-shaped section, the rear part of the central hole is in a bell mouth shape, and the flared end of the bell mouth is close to the fourth arc-shaped section; the conductive part is made of conductive silicon rubber; when the stress cone is applied, the stress cone is fixed at the cut-off position of the cable-arranging accessory, a center hole of a conductive part at one end far away from the horn mouth faces the cut-off position of the cable, the center hole is sleeved outside the exposed shielding layer, and the insulating part is sleeved outside the insulating layer which is exposed at the cut-off position and wraps the outer side of the core wire; extending the cut part of the insulating and shielding layer of the power cable to enable the zero potential to form a horn shape, and improving the electric field distribution of the insulating and shielding layer; the diameter of the central hole is 60mm, the length of the central hole is 113.5mm, the radiuses of the first arc-shaped section, the second arc-shaped section, the third arc-shaped section and the fifth arc-shaped section are all 3.5mm, the wall thickness of the first cylindrical section is 15mm, and the length of the first cylindrical section is 30 mm; the length of the second cylindrical section is 14mm, and the axial lengths of the second arc-shaped section and the third arc-shaped section are both 6 mm; the conductive part has an overall length of 190 mm.
- 2. The special silicone rubber electric field stress control method for the 220kV cable terminal accessory according to claim 1, wherein the insulating part is provided with a slot for accommodating a fourth cylindrical section and a fourth arc-shaped section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810442853.9A CN108666963B (en) | 2018-05-10 | 2018-05-10 | Electric field stress control method of special silicone rubber for 220kV cable terminal accessories |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810442853.9A CN108666963B (en) | 2018-05-10 | 2018-05-10 | Electric field stress control method of special silicone rubber for 220kV cable terminal accessories |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108666963A CN108666963A (en) | 2018-10-16 |
| CN108666963B true CN108666963B (en) | 2021-06-15 |
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ID=63778220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810442853.9A Active CN108666963B (en) | 2018-05-10 | 2018-05-10 | Electric field stress control method of special silicone rubber for 220kV cable terminal accessories |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108666963B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202917936U (en) * | 2012-11-26 | 2013-05-01 | 广东吉熙安电缆附件有限公司 | High voltage crosslinked cable oil charge terminal |
| CN207339229U (en) * | 2017-06-13 | 2018-05-08 | 镇江丹高电力科技有限公司 | A kind of stress cone for cable connection |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3860741A (en) * | 1974-01-18 | 1975-01-14 | Thomas & Betts Corp | Stress cone |
| DE2643197C2 (en) * | 1976-09-22 | 1978-07-20 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Process, silicone rubber compound and mold wetting solution for the production of SiUkongununi moldings |
| DE2951729A1 (en) * | 1979-12-20 | 1981-07-02 | Siemens AG, 1000 Berlin und 8000 München | Cable end fitting with elastic insulator body - has metal outer housing and hollow elastomeric body with cylindrical and conical portions |
| JP3198964B2 (en) * | 1997-02-26 | 2001-08-13 | 日立電線株式会社 | Cable head or power cable termination |
| CN2593430Y (en) * | 2002-10-25 | 2003-12-17 | 上海三原电缆附件公司 | EPDM rubber stress cone |
| CN2757397Y (en) * | 2004-02-13 | 2006-02-08 | 深圳市沃尔核材股份有限公司 | Cold contract cable middle joint |
| CN201829912U (en) * | 2010-10-29 | 2011-05-11 | 江苏远航电缆附件有限公司 | Stress cone for 10kV silicone rubber cable accessories |
| CN202474790U (en) * | 2012-03-30 | 2012-10-03 | 长园电力技术有限公司 | Prefabricated intermediate joint for cable |
| CN205081445U (en) * | 2015-09-06 | 2016-03-09 | 科耐特电缆附件股份有限公司 | Brand -new graphite alkene stress cone for cable accessories |
| CN205622188U (en) * | 2016-04-27 | 2016-10-05 | 广东阿尔派新材料股份有限公司 | GIS terminal insulation sealing structure |
-
2018
- 2018-05-10 CN CN201810442853.9A patent/CN108666963B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202917936U (en) * | 2012-11-26 | 2013-05-01 | 广东吉熙安电缆附件有限公司 | High voltage crosslinked cable oil charge terminal |
| CN207339229U (en) * | 2017-06-13 | 2018-05-08 | 镇江丹高电力科技有限公司 | A kind of stress cone for cable connection |
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| Publication number | Publication date |
|---|---|
| CN108666963A (en) | 2018-10-16 |
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