CN110676798A - Conductive cone, cable terminal and cable intermediate joint - Google Patents

Conductive cone, cable terminal and cable intermediate joint Download PDF

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Publication number
CN110676798A
CN110676798A CN201910878787.4A CN201910878787A CN110676798A CN 110676798 A CN110676798 A CN 110676798A CN 201910878787 A CN201910878787 A CN 201910878787A CN 110676798 A CN110676798 A CN 110676798A
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CN
China
Prior art keywords
cable
conductive
cone
transparent
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910878787.4A
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Chinese (zh)
Inventor
罗艺
王海田
韩正一
周明瑜
尹立
周育桢
张翀
翟雪冰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
Yantai Power Supply Co of State Grid Shandong Electric Power Co Ltd
European Institute For Global Energy Internet
Original Assignee
State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
Yantai Power Supply Co of State Grid Shandong Electric Power Co Ltd
European Institute For Global Energy Internet
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Global Energy Interconnection Research Institute, Yantai Power Supply Co of State Grid Shandong Electric Power Co Ltd, European Institute For Global Energy Internet filed Critical State Grid Corp of China SGCC
Priority to CN201910878787.4A priority Critical patent/CN110676798A/en
Publication of CN110676798A publication Critical patent/CN110676798A/en
Pending legal-status Critical Current

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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays

Abstract

The invention relates to the technical field of power cable accessories, in particular to a conductive cone, a cable terminal and a cable intermediate joint. A conductive cone, comprising: the transparent conductive layer completely covers the first transparent insulator. The cable terminal comprises the conductive cone, and the conductive cone is sleeved at the joint of an insulating layer of a cable and a semi-conductive insulating shielding layer of the cable. The utility model provides a cable intermediate head, includes a pair of electrically conductive awl, it is a pair of electrically conductive awl sets up in opposite directions, electrically conductive awl cover is established at the junction of the insulating layer of cable and the semi-conductive insulating shield layer of cable, and a pair of cable conductor that is located cable joint center department passes through connection structure and fixes. The invention provides a conductive cone, a cable terminal and a cable intermediate joint which have wide application range and high partial discharge monitoring sensitivity.

Description

Conductive cone, cable terminal and cable intermediate joint
Technical Field
The invention relates to the technical field of power cable accessories, in particular to a conductive cone, a cable terminal and a cable intermediate joint.
Background
The interface between the stress cone of the cable accessory and the cable insulation is the weakest link in the cable accessory, and when the interface has defects or insufficient interface pressure, partial discharge is likely to occur at the interface under the action of an electric field. In order to optically measure the partial discharge phenomenon, at least one optical path is required to be arranged inside the cable accessory, wherein the optical path allows the partial discharge optical signal to penetrate through the stress cone and propagate outwards. At present, a method for realizing partial discharge measurement inside a stress cone by using a transparent insulating silicon rubber material is available, but a conductive cone of the method is made of a black non-transparent material, so that a partial light discharge line can only penetrate outwards through an optical path at a specific angle, an optical propagation path is longer, and the application range of the stress cone and the sensitivity of partial line defense monitoring are limited.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the optical propagation path of the conductive cone is long, the application range is limited, and the sensitivity is low, so as to provide a conductive cone, a cable terminal and a cable intermediate joint, which have the advantages of short optical propagation path, wide application range, and high sensitivity of partial discharge monitoring.
In order to solve the above technical problem, the present invention provides a conductive cone, including:
the transparent conductive layer completely covers the first transparent insulator.
The transparent conducting layer of the conducting cone is a transparent conducting oxide coating or a metal nanowire net.
The conductive cone, the transparent conductive oxide coating is SnO2、In2O3、ZnO、CdO、Ga2O3、ZnO－SnO2、ZnO－In2O3、In2O3－SnO2、CdO－SnO2、CdO－In2O3、MgIn2O4、GaInO3、CdSb2O6、Zn－In2O3－SnO2、CdO－In2O3－SnO2And ZnO-CdO-In2O3－SnO2Any of the coatings.
The metal nanowire net is any one of a silver nanowire net, a copper nanowire net, a gold nanowire net, a silver-plated nanowire net on the surface layer of a copper wire core and a silver-plated nanowire net on the surface layer of a nickel wire core.
The cable terminal comprises the conductive cone, and the conductive cone is sleeved at the joint of the insulating layer of the cable and the semi-conductive insulating shielding layer of the cable.
The cable terminal also comprises a second transparent insulator coated outside the conductive cone and the insulating layer of the cable, wherein an optical fiber is wound outside the second transparent insulator and used for receiving an optical signal generated by partial discharge at the joint of the conductive cone, the insulating layer of the cable and the semi-conductive insulating shielding layer of the cable.
And in the cable terminal, the optical fiber is arranged corresponding to the conductive cone.
The utility model also provides a cable intermediate head, including a pair of electrically conductive awl, it is a pair of electrically conductive awl sets up in opposite directions, electrically conductive awl cover is established at the junction of the insulating layer of cable and the semi-conductive insulating shield layer of cable, and a pair of cable conductor passes through connection structure and fixes.
The cable intermediate joint, connection structure is the conductor connecting pipe.
The cable intermediate head, still include by interior to outer cladding in proper order the outside transparent insulator of second of conductive cone, stress cone insulation shield and metallic shield layer, optic fibre sets up metallic shield with between the transparent insulator of second, and be close to the conductive cone sets up.
The technical scheme of the invention has the following advantages:
1. according to the conductive cone provided by the invention, the first transparent insulator in the conductive cone and the transparent conducting layer outside the conductive cone are arranged, so that an optical signal generated by partial discharge can directly penetrate through the first transparent insulator and the transparent conducting layer to be transmitted to an external signal processing unit, and the optical online monitoring of the partial discharge is realized.
2. According to the cable terminal provided by the invention, the optical fiber wound outside the second transparent insulator is arranged corresponding to the conductive cone, so that optical signals generated by partial discharge at the joint of the conductive cone, the insulating layer of the cable and the semi-conductive insulating shielding layer of the cable can be directly transmitted outwards and captured in time, the shortest transmission path of the optical signals is achieved, the attenuation in the transmission process is reduced, and the detection sensitivity is improved.
3. The cable intermediate joint provided by the invention has the advantages that the pair of conductive cones are oppositely arranged, and the optical fiber is arranged between the metal shielding layer and the second transparent insulator and is close to the conductive cones. The optical signals generated by partial discharge of the pair of conductive cones can be received by different optical fibers respectively, so that the detection efficiency and accuracy are further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a cross-sectional view of a conductive cone provided by the present invention;
FIG. 2 is a schematic view of a cable termination provided by the present invention;
fig. 3 is a schematic view of a cable intermediate joint provided by the present invention.
Description of reference numerals:
1-a first transparent insulator; 2-a transparent conductive layer; 3-a conductive cone; 4-straight part; 5-bending part; 6-insulation of the cable; 7-a semi-conductive insulating shield of the cable; 8-a second transparent insulator; 9-an optical fiber; 10-conductor connection pipe; 11-a high voltage electrode; 12-a cable conductor; 13-stress cone insulating shielding layer; 14-metallic shielding layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
One embodiment of the conductive cone shown in fig. 1 comprises a first transparent insulator 1 disposed inside and a transparent conductive layer 2 covering outside, wherein the transparent conductive layer 2 completely covers the first transparent insulator 1. The first transparent insulator 1 is made by pouring transparent silicone rubber into a mold, and then forming a transparent conductive layer 2 on the surface of the cured and molded transparent silicone rubber by means of spraying, for example. The first transparent insulator 1 and the transparent conductive layer 2 each include two parts, namely a straight part 4 and a bent part 5, and the bent part 5 extends towards the direction away from the axis of the conductive cone 3.
As a specific embodiment, the transparent conductive layer 2 is a transparent conductive oxide coating, such as SnO2、In2O3、ZnO、CdO、Ga2O3、ZnO－SnO2、ZnO－In2O3、In2O3－SnO2、CdO－SnO2、CdO－In2O3、MgIn2O4、GaInO3、CdSb2O6、Zn－In2O3－SnO2、CdO－In2O3－SnO2And ZnO-CdO-In2O3－SnO2Any of the coatings. The transparent conductive oxide coating is coated on the outside of the first transparent insulator 1 by a sputtering process.
Alternatively, the transparent conductive layer 2 may be a metal nanowire network, such as any one of a silver nanowire network, a copper nanowire network, a gold nanowire network, a copper wire core surface silver-plated nanowire network, and a nickel wire core surface silver-plated nanowire network. The transparent metal nanowire net covers the outside of the first transparent insulator 1 through a spraying process, then covers the transparent silicon rubber to fill the gap of the first transparent insulator, and meanwhile, the metal nanowire net part and the transparent silicon rubber part are well connected.
One embodiment of the cable termination shown in fig. 2 comprises a conductive cone 3, wherein the conductive cone 3 is sleeved at the joint of an insulating layer 6 of a cable and a semi-conductive insulating and shielding layer 7 of the cable, a stress cone insulating part made of transparent silicon rubber serving as a second transparent insulator 8 is further coated outside the conductive cone 3 and the insulating layer 6 of the cable, and an optical fiber 9 for receiving an optical signal generated by partial discharge at the joint of the conductive cone 3 and the insulating layer 6 of the cable and the semi-conductive insulating and shielding layer 7 of the cable is wound outside the second transparent insulator 8, because the cross section between the conductive cone 3 and the insulating layer 6 of the cable is the position where partial discharge is most likely to occur if defects exist in installation or design. Specifically, the optical fiber 9 is disposed corresponding to the conductive cone 3, that is, the optical fiber 9 is disposed at a shortest straight distance where an optical signal at a position where partial discharge is likely to occur is transmitted outward. One end of the optical fiber 9 is connected to a signal processing unit, which is required to be able to record the intensity, quantity and time point of the received light pulse and send the information to the equipment state on-line monitoring unit. The optical signal generated by the partial discharge sequentially passes through the transparent conductive cone and the transparent stress cone insulator along the straight line shortest distance, is received by the optical fiber 9 wound outside the transparent stress cone insulator and is transmitted to the signal processing unit, so that the optical online monitoring of the partial discharge of the cable accessory is realized.
One embodiment of the cable intermediate joint shown in fig. 3 includes a pair of conductive cones 3, the bent portions 5 of the pair of conductive cones 3 are disposed opposite to each other, the conductive cones 3 are sleeved on the connection portion of the insulating layer 6 of the cable and the semi-conductive insulating shielding layer 7 of the cable, and a pair of cable conductors 12 are fixed by a connection structure. The conductive cone 3 is sleeved at the joint of an insulating layer 6 of a cable and a semi-conductive insulating and shielding layer 7 of the cable, a stress cone insulating part made of transparent silicon rubber serving as a second transparent insulator 8 is further coated outside the conductive cone 3 and the insulating layer 6 of the cable, an optical fiber 9 is wound outside the second transparent insulator 8, and the optical fiber 9 is used for receiving optical signals generated by partial discharge at the joint of the conductive cone 3, the insulating layer 6 of the cable and the semi-conductive insulating and shielding layer 7 of the cable. Specifically, the connecting structure is a conductor connecting pipe 10 sleeved at the end of the insulating layer 6 of the cable. The high-voltage electrode 11 is sleeved on the periphery of the conductor connecting pipe 10, and the high-voltage electrode 11 is made of an opaque semi-conductive silicon rubber material. The conductive cone 3, the high voltage electrode 11, the second transparent insulator 8 and the stress cone insulating shield 13 are typically produced as a single unit by means of a mould and then mounted in place. A stress cone insulating and shielding layer 13 and a metal shielding layer 14 are sequentially coated outside the second transparent insulator 8 from inside to outside, and the stress cone insulating and shielding layer 13 is sleeved on the circumference of the second transparent insulator 8 and is not contacted with the semi-conductive insulating and shielding layer 7 of the cable; the metal shielding layer 14 forms a closed structure, is sleeved on the periphery of the stress cone insulating shielding layer 13, and is arranged in contact with the semi-conductive insulating shielding layer 7 of the cable. The optical fibers 9 are disposed between the metal shielding layer 14 and the second transparent insulator 8 and disposed near the conductive cone 3, and in this embodiment, the optical fibers 9 are disposed near the ends between the metal shielding layer 14 and the second transparent insulator 8, respectively.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A conductive cone, comprising:
the transparent conductive layer is characterized by comprising a first transparent insulator (1) arranged inside and a transparent conductive layer (2) covering the outside, wherein the transparent conductive layer (2) completely covers the first transparent insulator (1).
2. The cone according to claim 1, wherein the transparent conductive layer (2) is a transparent conductive oxide coating or a network of metal nanowires.
3. The cone of claim 2 wherein the transparent conductive oxide coating is SnO2、In2O3、ZnO、CdO、Ga2O3、ZnO－SnO2、ZnO－In2O3、In2O3－SnO2、CdO－SnO2、CdO－In2O3、MgIn2O4、GaInO3、CdSb2O6、Zn－In2O3－SnO2、CdO－In2O3－SnO2And ZnO-CdO-In2O3－SnO2Any of the coatings.
4. The conductive cone according to claim 2, wherein the metal nanowire mesh is any one of a silver nanowire mesh, a copper nanowire mesh, a gold nanowire mesh, a copper wire core surface layer silver-plated nanowire mesh, and a nickel wire core surface layer silver-plated nanowire mesh.
5. A cable termination, characterized in that it comprises a conductive cone according to any of claims 1 to 4, said conductive cone (3) being fitted around the junction between the insulating layer (6) of the cable and the semiconductive insulating shield (7) of the cable.
6. The cable termination according to claim 5, further comprising a second transparent insulator (8) covering the conductive cone (3) and the insulation (6) of the cable, an optical fiber (9) being wound outside the second transparent insulator (8), the optical fiber (9) being adapted to receive an optical signal generated by a partial discharge at the junction of the conductive cone (3) with the insulation (6) of the cable and the semi-conductive insulation shield (7) of the cable.
7. The cable termination according to claim 6, characterized in that the optical fibers (9) are arranged in correspondence of the conductive cones (3).
8. An intermediate joint of a cable, characterized by comprising a pair of conductive cones (3) as claimed in any one of claims 1 to 4, the pair of conductive cones (3) are arranged oppositely, the conductive cones (3) are sleeved at the joint of an insulating layer (6) of the cable and a semi-conductive insulating shielding layer (7) of the cable, and a pair of cable conductors (12) are fixed through a connecting structure.
9. The cable intermediate joint according to claim 8, characterized in that the connection structure is a conductor connection tube (10).
10. The cable intermediate joint according to claim 8, further comprising a second transparent insulator (8), a stress cone insulating and shielding layer (13) and a metal shielding layer (14) which are sequentially coated outside the conductive cone (3) from inside to outside, wherein the optical fiber (9) is arranged between the metal shielding layer (14) and the second transparent insulator (8) and is close to the conductive cone (3).
CN201910878787.4A 2019-09-17 2019-09-17 Conductive cone, cable terminal and cable intermediate joint Pending CN110676798A (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111431137A (en) * 2020-04-20 2020-07-17 深圳供电局有限公司 Cable intermediate joint
CN112946429A (en) * 2021-01-27 2021-06-11 云南电网有限责任公司电力科学研究院 Electromagnetic shielding box for GIS partial discharge optical detection device
CN113504442A (en) * 2021-07-14 2021-10-15 国网北京市电力公司 Coil-mounted high-voltage emergency repair cable detection device
IT202100012314A1 (en) * 2021-05-13 2022-11-13 Omnienergy S R L ELECTRIC JOINT FOR THE DETECTION OF PARTIAL DISCHARGES

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CN106229922A (en) * 2016-08-30 2016-12-14 江苏华强电力设备有限公司 A kind of second third insulate copper pipe bus transition joint adnexa
EP3109958A1 (en) * 2015-06-22 2016-12-28 Tyco Electronics Raychem GmbH Field control element for a high-voltage cable accessory and method of optically measuring partial discharges
CN206340936U (en) * 2016-08-30 2017-07-18 江苏华强电力设备有限公司 A kind of insulation of second third copper pipe bus transition joint annex
CN209168759U (en) * 2018-11-16 2019-07-26 顾氏纳米科技（浙江）有限公司 A kind of silver nanowires and transparent conductive oxide composite transparent conductive film

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Publication number Priority date Publication date Assignee Title
CN201075652Y (en) * 2007-07-30 2008-06-18 北京国电四维电力技术有限公司 Dry type prefabricated gas insulated terminal
CN102185274A (en) * 2011-01-04 2011-09-14 江苏远航电缆附件有限公司 110KV intermediate head and production process thereof
WO2016180396A1 (en) * 2015-05-12 2016-11-17 Iph Institut "Prüffeld Für Elektrische" Gmbh Set of high-voltage cables and method for producing a set of high-voltage cables
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CN106229922A (en) * 2016-08-30 2016-12-14 江苏华强电力设备有限公司 A kind of second third insulate copper pipe bus transition joint adnexa
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111431137A (en) * 2020-04-20 2020-07-17 深圳供电局有限公司 Cable intermediate joint
CN111431137B (en) * 2020-04-20 2021-12-21 深圳供电局有限公司 Cable intermediate joint
CN112946429A (en) * 2021-01-27 2021-06-11 云南电网有限责任公司电力科学研究院 Electromagnetic shielding box for GIS partial discharge optical detection device
IT202100012314A1 (en) * 2021-05-13 2022-11-13 Omnienergy S R L ELECTRIC JOINT FOR THE DETECTION OF PARTIAL DISCHARGES
CN113504442A (en) * 2021-07-14 2021-10-15 国网北京市电力公司 Coil-mounted high-voltage emergency repair cable detection device

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Application publication date: 20200110