WO2016090824A1 - 一种不填充绝缘介质的电容型电缆终端 - Google Patents

一种不填充绝缘介质的电容型电缆终端 Download PDF

Info

Publication number
WO2016090824A1
WO2016090824A1 PCT/CN2015/077894 CN2015077894W WO2016090824A1 WO 2016090824 A1 WO2016090824 A1 WO 2016090824A1 CN 2015077894 W CN2015077894 W CN 2015077894W WO 2016090824 A1 WO2016090824 A1 WO 2016090824A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
capacitive
screen
insulating
insulating sleeve
Prior art date
Application number
PCT/CN2015/077894
Other languages
English (en)
French (fr)
Inventor
王欢
Original Assignee
北京瑞恒新源投资有限公司
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 北京瑞恒新源投资有限公司 filed Critical 北京瑞恒新源投资有限公司
Publication of WO2016090824A1 publication Critical patent/WO2016090824A1/zh

Links

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
    • H02G15/072—Cable terminating boxes, frames or other structures with devices for relieving electrical stress of the condenser type

Definitions

  • a capacitive cable terminal that is not filled with an insulating medium belongs to the field of high-voltage electrical appliances and can be used as a cable terminal for outdoor, indoor, and GIS parts that are packed with solid insulation.
  • Typical cable terminations include stress cones that improve the stress concentration at the root end of the cable end, insulation sleeves (which may be porcelain sleeves or resin sleeves), and insulating media (liquid or gas) that fill the interior space.
  • the role of the stress cone is to improve the electric field strength at the root of the cable and reduce the stress concentration;
  • the function of the insulating sleeve is to contain the stress cone and the insulating medium, and to support the cable termination head and increase the creepage distance, the upper end of the insulating sleeve
  • the flange is fixed at the end of the cable conductor, and the lower flange of the root of the insulating sleeve is fixed at the ground of the cable sheath.
  • the end of the insulating sleeve is at a high potential, the root is at ground potential, and the electric field strength at each internal point is high, and discharge (including breakdown, flashover or partial discharge) is easily generated in the air gap between the sleeve and the cable.
  • discharge including breakdown, flashover or partial discharge
  • the insulation is damaged, so it is necessary to fill the insulating medium to ensure the insulation strength and reduce the partial discharge to the standard, so as to ensure safety in long-term operation.
  • the existing product must be filled with an insulating medium to improve the dielectric strength and reduce the partial discharge.
  • the patent is provided on the inner wall of the insulating sleeve (or in the insulation adjacent to the inner wall) extending from the upper flange (conductive end) to a metal equipotential screen or semi-conductive equivalent of the top surface of the stress sleeve.
  • the screen and the cable core (conductor) form a high-voltage equipotential chamber.
  • the end of the insulating sleeve has an upper flange connected to the lead core and the terminal, and the root of the insulating sleeve has a lower flange connected to the grounding layer of the cable and the grounding portion of the stress sleeve, and the inner surface of the lower part of the insulating sleeve is tightly pressed against the side of the stress sleeve Pick up.
  • the grounding screen linked with the lower flange is also disposed on the outermost layer of the insulating sleeve, and is waiting for A plurality of capacitive screens insulated from each other are disposed in the insulating layer between the bit screen and the grounding screen.
  • the upper and lower edges of the capacitive screen are stepped back along the outer surface of the insulating sleeve and the contact surface of the insulating sleeve and the stress sleeve toward the ground side.
  • this group of capacitive screens is to control the voltage of the outer surface of the insulating sleeve by the principle of capacitance partial pressure, so that the potential distribution is uniform, and the creeping discharge voltage is increased, thereby increasing the flashover voltage.
  • the voltage distribution of the tight contact surface of the stress sleeve and the insulating sleeve is controlled to prevent flashover along the contact surface of the insulating sleeve and the stress sleeve.
  • This set of capacitive screens disposed in an insulating sleeve is another key technology of this patent.
  • a capacitor type cable terminal not filled with an insulating medium comprises a conductive rod 1, a stress sleeve 2, a capacitive insulating sleeve 5 having an upper flange 3 and a ground flange 4, and a capacitive insulating sleeve 5 is tightly crimped to the stress sleeve 2, characterized in that: the high-voltage isolating screen 6 which is embedded in the inner surface of the capacitive insulating sleeve 5 and extends from the upper flange 3 to the top surface of the stress sleeve 2 and the cable conductive core 7 constitutes a High-voltage equipotential warehouse 8, the electric field strength in the warehouse is zero, and a set of capacitive screens 9 insulated from each other are embedded in the insulating layer of the capacitive insulating sleeve except the high-voltage parity screen 6, and the outermost grounding screen 10 is Lower flange connection, along the insulation sleeve The outer surface
  • the present invention has the following advantages:
  • the assembly gap between the capacitor-type insulating sleeve and the cable is in the high-voltage equipotential warehouse. It does not need to be filled with insulating medium, and it will not cause leakage. It is not only energy-saving, environmentally friendly, but also safe and reliable.
  • the potential gradient of the contact surface of the stress sleeve and the capacitive insulating sleeve and the outer surface are controlled, so that the potential gradients of the inner and outer insulation are relatively uniform, which not only improves the electrical endurance of the cable terminal, The creeping discharge voltage is further increased, thereby increasing the flashover voltage and prolonging the service life of the cable terminal.
  • the length of the equal-length screen of the capacitor cable terminal can be appropriately adjusted, or the length of the cable guide wire can be lengthened by a length of conductor, thereby solving the practical installation problems such as insufficient cable length and limited installation space.
  • FIG. 1 Schematic diagram of a capacitor cable termination structure without filling an insulating medium
  • a capacitive insulating sleeve 5 having an upper flange 3 (for example, an aluminum alloy) and a ground flange 4 (for example, an aluminum alloy) (for example, surrounded by epoxy glass)
  • the capacitive insulating sleeve 5 and the stress sleeve 2 should be tightly crimped, and the inner surface of the capacitive insulating sleeve 5 is extended from the upper flange to the stress sleeve 2
  • the top surface of the high-voltage isolating screen 6 for example, laid in the insulating layer with a metal foil or a semi-conductive strip
  • the cable conductive core 7 form a high-pressure equal position chamber 8 (essentially an air chamber)
  • a capacitive insulating sleeve 5 layers of insulation are also embedded in each other
  • the capacitive screen 9 of the edge for example, laid with a metal foil
  • the cable sheath After arriving at the site, the cable sheath should be stripped off (with the length of the capacitor cable terminal), the semi-conductive layer of the cable should be removed, and the conductive rod 1 should be crimped at the end, and then the capacitor cable not filled with the insulating medium should be used.
  • the terminal set is on the cable that peels off the outer skin and then the flange is fixed to the frame.

Landscapes

  • Cable Accessories (AREA)
  • Insulating Bodies (AREA)

Abstract

一种不填充绝缘介质的电容型电缆终端，属于高压电器领域，主要解决电缆终端绝缘套筒内部不充填绝缘介质的技术难题。该电容型电缆终端包括：镶嵌于电容型绝缘套筒（5）内表面的由上法兰（3）延伸至应力套（2）顶面的高压等位屏（6）与电缆导电芯（7）构成的高压等位仓（8），仓内电场强度为零，不需填充绝缘介质，电容型绝缘套筒（5）的绝缘层内还嵌有的一组彼此绝缘的电容屏（9），最外层的接地屏（10）与下法兰（4）连接。该电缆终端不填充绝缘介质，解决了漏油和漏气的难题，节能、环保、安全、可靠，由于一组电容屏设置在绝缘套筒中，提高了电缆终端的绝缘水平和寿命。

Description

一种不填充绝缘介质的电容型电缆终端 技术领域
一种不填充绝缘介质的电容型电缆终端属于高压电器领域，可用作挤包固体绝缘的户外、户内、以及GIS等部位的电缆终端。
背景技术
一般电缆终端包括改善电缆终端根部应力集中的应力锥，绝缘套筒(可能是瓷套或树脂套筒)，以及充满内部空间的绝缘介质(液体或气体)。应力锥的作用是改善电缆根部电场强度，减小应力集中；绝缘套筒的作用是包容应力锥和绝缘介质，并支撑电缆终端头和增加外爬电距离，绝缘套筒的端部的上法兰固定在电缆导体的端部，绝缘套筒根部的下法兰固定在电缆外皮的接地处。但由于绝缘套筒端部处于高电位，根部处于地电位，内部各点电场强度都较高，套筒与电缆间的空气间隙中很容易产生放电(包括击穿，闪络或局部放电)，而使得绝缘损坏，所以必须充填绝缘介质，才能保证绝缘强度并使局部放电量降低到标准之下，才能在长期运行中保证安全。
在现场安装电缆终端时填充绝缘介质是很麻烦的一件事，不仅要保证清洁的环境，还需要使用较多的设备和较复杂的工艺，而且运行后绝缘介质可能会造成渗漏，如果漏油可能造成火灾，如果运行后的SF6气体发生渗漏，还可能造成环境污染或人员中毒，甚至造成爆炸，威胁到人身安全和设备的安全。本专利的目的是发明一种不填充绝缘介质的电容型电缆终端，能够更方便、高效进行现场安装，并安全、可靠的运行，为此，特提出本发明专利。
发明内容
由于绝缘套筒内各点电位不同，而且绝缘套筒与电缆装配时不可避免有空气间隙，所以现有产品必须充填绝缘介质用以提高绝缘强度和降低局部放电量。 为免充绝缘介质，本专利设置在绝缘套筒内壁(或镶嵌在紧邻内壁的绝缘中)从上法兰处(导电端)延伸到应力套顶面的一金属等位屏或半导电等位屏，与电缆芯(导体)之间构成一个高压等位仓，在此空腔内各点电位相同，但电场强度为零，因此不需填充绝缘介质，绝缘套筒与电缆之间出现空隙也不会造成放电。这延伸的等位屏虽然短路掉绝缘套筒内表面的大部分绝缘，但剩下的一部分表面绝缘与应力套紧密配合仍可以承担导体与接地体之间的电压。这延伸的等位屏与导体之间构成的高压等位仓是这一专利的主要技术关键。
绝缘套筒的端部有上法兰与导芯及端子连接，绝缘套筒的根部有下法兰与电缆接地层及应力套接地部分连接，绝缘套筒下部的内表面与应力套侧面紧密压接。除上述在绝缘套筒的内表面或最接近内表面的绝缘中设置延伸的等位屏与导体连接外，还在绝缘套筒的最外层设置与下法兰链接的接地屏，并在等位屏与接地屏间的绝缘层中设置若干个彼此绝缘的电容屏。这组电容屏的上、下边缘分别沿着绝缘套筒的外表面及绝缘套筒与应力套的接触面向接地侧呈阶梯式退缩。这组电容屏的目的在于，利用电容分压的原理控制绝缘套筒的外表面电压，使电位分布均匀，提高沿面放电电压，从而提高污闪电压。同时控制应力套与绝缘套筒的紧密接触面的电压分布，防止沿绝缘套筒与应力套接触面闪络。这一组设置在绝缘套筒中的电容屏是本专利的另一关键技术。
按照本发明所提供的一种不填充绝缘介质的电容型电缆终端，包括导电杆1、应力套2，具有上法兰3和接地法兰4的电容型绝缘套筒5，电容型绝缘套筒5与应力套2紧密压接，其特征在于：镶嵌于电容型绝缘套筒5内表面的由上法兰3处延伸至应力套2顶面的高压等位屏6与电缆导电芯7构成一高压等位仓8，仓内电场强度为零，除高压等位屏6外电容型绝缘套筒的绝缘层内还嵌有的一组彼此绝缘的电容屏9，最外层的接地屏10与下法兰连接，沿着绝缘套 筒5的外表面以及沿着绝缘套筒5与应力套2的接触面，电容屏9的上、下边缘均向下法兰侧呈阶梯式退缩。
与现有技术相比，本发明具有以下优点：
1电容型绝缘套筒与电缆的装配间隙处于高压等位仓内，不必充填绝缘介质，更不会造成渗漏，不仅节能、环保，而且安全、可靠。
2现场安装施工非常便捷、高效，高压等位仓部位的电缆绝缘表面不必打磨光滑，节省了很多时间。
3由于多个电容屏的存在，控制了应力套与电容型绝缘套筒接触面以及外表面的电位梯度，使内、外绝缘的电位梯度都比较均匀，不仅提高了电缆终端的耐电强度，更提高了沿面放电电压，从而提高了污闪电压，也延长了电缆终端的使用寿命。
4可以根据实际的现场条件，可以适当调整电容型电缆终端等位屏的长度，或者利用一段导体加长电缆导芯，从而解决电缆不够长和安装空间有限等实际安装问题。
附图说明
图1不填充绝缘介质的电容型电缆终端结构示意图
具体实施方式
如图1所示，本专利制作时，将具有上法兰3(例如，铝合金)和接地法兰4(例如，铝合金)的电容型绝缘套筒5(例如，由环氧玻璃丝包绕)与应力套2(例如，硅橡胶制作)组装一起，电容型绝缘套筒5与应力套2应紧密压接，镶嵌于电容型绝缘套筒5内表面的由上法兰延伸至应力套2的顶面的高压等位屏6(例如，用金属箔或半导电带敷设在绝缘层中)与电缆导电芯7构成一高压等位仓8(实质是一空气腔)，电容型绝缘套筒5的绝缘层内还嵌有一组彼此绝 缘的电容屏9(例如，用金属箔或半导电带敷设)，这些电容屏的上边缘及下边缘分别沿着电容型绝缘套筒5的外表面及沿着电容型绝缘套筒5与应力套2的接触面向接地侧呈阶梯式退缩。
到现场后，应将一段电缆(与电容型电缆终端头长度配合)剥掉电缆外皮，去掉电缆的半导电层，且端部压接导电杆1，然后将此不填充绝缘介质的电容型电缆终端套装在剥掉外皮的电缆上，再将法兰固定在构架上。

Claims (10)

  1. 一种不填充绝缘介质的电容型电缆终端，包括导电杆(1)、应力套(2)及装有上法兰(3)和下法兰(4)的电容型绝缘套筒(5)，电容型绝缘套筒(5)与应力套(2)紧密压接，其特征在于：镶嵌于电容型绝缘套筒(5)内表面的由上法兰(3)延伸至应力套(2)顶面的高压等位屏(6)与电缆导电芯(7)构成一高压等位仓(8)，仓内电场强度为零，除高压等位屏(6)外，电容型绝缘套筒(5)的绝缘层内还嵌有的一组彼此绝缘的电容屏(9)，最外层的接地屏(10)与下法兰连接，沿着电容型绝缘套筒(5)的外表面以及沿着电容型绝缘套筒(5)与应力套(2)的接触面，电容屏(9)的上、下边缘均向下法兰侧呈阶梯式退缩。
  2. 如权利要求1所述的不填充绝缘介质的电容型电缆终端，其特征在于：电容型绝缘套筒(5)可以是环氧玻璃钢或其他热固性绝缘材料制成，其外形可以是锥形或圆筒形。
  3. 如权利要求1所述的不填充绝缘介质的电容型电缆终端，其特征在于：设置在电容型绝缘套筒内的一组金属或半导电材料的电容屏，是在制作绝缘套筒的过程中被敷设或固定在其中且彼此绝缘，沿着绝缘套筒(5)的外表面以及沿着绝缘套筒(5)与应力套(2)的接触面电容屏(9)的上、下边缘均向下法兰侧呈阶梯式退缩。
  4. 一种新型的不填充绝缘介质的电缆终端头，包括导电杆(1)，应力套(2)，具有上法兰(3)和接地法兰(4)的电容型绝缘套筒(5)，电容型绝缘套筒(5)与应力套(2)紧密压接，其特征在于：镶嵌于电容型绝缘套筒(5)内表面的由上法兰(3)延伸至应力套(2)顶面的高压等位屏(6)与电缆导电芯(7)构成一高压等位仓(8)，仓内电场强度为零。
  5. 一种不填充绝缘介质的电容型电缆终端，包括导电杆(1)、应力套(2)及装有上法兰(3)和下法兰(4)的电容型绝缘套筒(5)，电容型绝缘套筒(5)与应力套(2)紧密压接，其特征在于：设置于电容型绝缘套筒(5)内表面的高压等位屏(6)与电缆导电芯(7)构成一高压等位仓(8)，高压等位仓(8)内电场强度为零。
  6. 根据权利要求5所述的不填充绝缘介质的电容型电缆终端，其特征在于：所述的高压等位屏(6)由上法兰(3)延伸至应力套(2)顶面。
  7. 根据权利要求5所述的不填充绝缘介质的电容型电缆终端，其特征在于：高压等位仓(8)内各点电位相同。
  8. 根据权利要求5-7任一所述的不填充绝缘介质的电容型电缆终端，其特征在于：所述的电容型绝缘套筒(5)的绝缘层内还嵌有的一组彼此绝缘的电容屏(9)，并且所述的高压等位屏(6)位于这组电容屏(9)与电缆导电芯(7)之间。
  9. 根据权利要求8所述的不填充绝缘介质的电容型电缆终端，其特征在于：这组电容屏(9)的最外层的接地屏(10)与下法兰连接，这组电容屏(9)的上、下边缘均向下法兰侧呈阶梯式退缩。
  10. 如权利要求8所述的不填充绝缘介质的电容型电缆终端，其特征在于：这组电容屏(9)由金属或半导电材料制成，在制作电容型绝缘套筒(5)的过程中被敷设或固定在其中且彼此绝缘；高压等位屏(6)为金属等位屏或半导电等位屏，可用金属箔或半导电带敷设在电容型绝缘套筒(5)的绝缘层中。
PCT/CN2015/077894 2014-12-08 2015-04-30 一种不填充绝缘介质的电容型电缆终端 WO2016090824A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410743483.4 2014-12-08
CN201410743483.4A CN105743053B (zh) 2014-12-08 2014-12-08 一种不填充绝缘介质的电容型电缆终端

Publications (1)

Publication Number Publication Date
WO2016090824A1 true WO2016090824A1 (zh) 2016-06-16

Family

ID=56106560

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/077894 WO2016090824A1 (zh) 2014-12-08 2015-04-30 一种不填充绝缘介质的电容型电缆终端

Country Status (2)

Country Link
CN (1) CN105743053B (zh)
WO (1) WO2016090824A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106483413A (zh) * 2016-12-05 2017-03-08 浙江舟山海洋输电研究院有限公司 高压直流电缆全干式简易测试终端
CN110265959A (zh) * 2019-06-25 2019-09-20 北京瑞恒新源投资有限公司 大电容量的电缆终端

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106469594B (zh) * 2015-08-19 2018-05-29 北京天威瑞恒高压套管有限公司 变压器套管
CN111327013B (zh) * 2018-12-14 2021-06-04 香港浩岳国际有限公司 电缆终端
CN113131432B (zh) * 2020-01-14 2023-03-14 香港浩岳国际有限公司 防爆的插拔式电容型电缆户外终端及制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19945148A1 (de) * 1999-09-21 2001-03-22 Detlef Jegust Endverschuß mit Stützfunktion
CN1710766A (zh) * 2004-06-16 2005-12-21 王日新 一种预制干式电容型电缆终端
CN103532081A (zh) * 2013-09-20 2014-01-22 天津沃尔法电力设备有限公司 架空线用的应力锥式与电容式复合绝缘型高压电缆终端

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210563C3 (de) * 1982-03-23 1986-02-20 Felten & Guilleaume Energietechnik GmbH, 5000 Köln Endverschluß für Hochspannungskabel verschiedenen Aufbaues
JP2003189454A (ja) * 2001-12-19 2003-07-04 Mitsubishi Cable Ind Ltd コンデンサコーン
CN2582240Y (zh) * 2002-11-01 2003-10-22 许建国 干式预制式电容型电缆终端
CN201340770Y (zh) * 2008-11-28 2009-11-04 天水长城开关厂有限公司 穿墙套管
CN201877772U (zh) * 2010-12-07 2011-06-22 长沙电缆附件有限公司 电气化铁路用套管式终端
CN202473432U (zh) * 2012-03-01 2012-10-03 上海旭然电器有限公司 防止闪络放电的绝缘子

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19945148A1 (de) * 1999-09-21 2001-03-22 Detlef Jegust Endverschuß mit Stützfunktion
CN1710766A (zh) * 2004-06-16 2005-12-21 王日新 一种预制干式电容型电缆终端
CN103532081A (zh) * 2013-09-20 2014-01-22 天津沃尔法电力设备有限公司 架空线用的应力锥式与电容式复合绝缘型高压电缆终端

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106483413A (zh) * 2016-12-05 2017-03-08 浙江舟山海洋输电研究院有限公司 高压直流电缆全干式简易测试终端
CN110265959A (zh) * 2019-06-25 2019-09-20 北京瑞恒新源投资有限公司 大电容量的电缆终端

Also Published As

Publication number Publication date
CN105743053A (zh) 2016-07-06
CN105743053B (zh) 2019-02-05

Similar Documents

Publication Publication Date Title
WO2016090824A1 (zh) 一种不填充绝缘介质的电容型电缆终端
CN102906955B (zh) 高压直流电缆终端装置
CN103038965A (zh) 高压直流电缆终端装置
CN104952562A (zh) 用于10kV输电线路的防雷防冰针式复合绝缘子
CN106469594B (zh) 变压器套管
CN205050651U (zh) 高压套管和绝缘母线
CN202584884U (zh) 绝缘屏蔽式管形母线
CN206712441U (zh) 一种110kV充油户外电缆终端
CN100449653C (zh) 带衬层的高压绝缘芯体
CN203337770U (zh) 电缆耐压试验装置
CN203573757U (zh) 一种具有避雷功能的支撑组件
CN105825914A (zh) 一种新型复合硅橡胶固体绝缘母线
CN105469958A (zh) 一种大电流胶浸纤维干式电容型变压器套管
CN209545119U (zh) 电缆终端
CN106997798A (zh) 免填充的电容式绝缘高压电气设备
CN206022653U (zh) 一种套管泄露电流信号提取的末屏接地装置
CN2497415Y (zh) 干式高压电流互感器
CN209015854U (zh) 提高电压互感器大n端绝缘水平的电缆引线结构
CN204167022U (zh) 一种高压穿墙套管
CN204732237U (zh) 用于10kV输电线路的防雷防冰针式复合绝缘子
CN204155678U (zh) 一种瓷式高压套管
CN207268981U (zh) 一种新型结构气体绝缘变压器套管
CN105428135A (zh) 隔离开关
CN202167806U (zh) 带电流互感器一体式硅油固化全干式穿墙套管
CN204167834U (zh) 一种高压穿墙套管的户外部分

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15868400

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 12/10/2017)

122 Ep: pct application non-entry in european phase

Ref document number: 15868400

Country of ref document: EP

Kind code of ref document: A1