WO2013086774A1 - 一种特高压直流穿墙套管及其屏蔽结构 - Google Patents

一种特高压直流穿墙套管及其屏蔽结构 Download PDF

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Publication number
WO2013086774A1
WO2013086774A1 PCT/CN2012/000897 CN2012000897W WO2013086774A1 WO 2013086774 A1 WO2013086774 A1 WO 2013086774A1 CN 2012000897 W CN2012000897 W CN 2012000897W WO 2013086774 A1 WO2013086774 A1 WO 2013086774A1
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WIPO (PCT)
Prior art keywords
flared
cylinder
shielding
sleeve
annular
Prior art date
Application number
PCT/CN2012/000897
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English (en)
French (fr)
Inventor
李绍军
韩国辉
王小焕
朱志豪
赵芳帅
柴影辉
杨继春
司小闯
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平高集团有限公司
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Publication of WO2013086774A1 publication Critical patent/WO2013086774A1/zh

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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
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields

Definitions

  • the invention relates to a UHV DC wall bushing in an UHV power facility, and to a shielding structure for an UHV wall bushing.
  • UHV wall bushings mostly adopt a shielding structure composed of two coaxially sleeved shielding cylinders, and axial or radial support is used between the two shielding cylinders, wherein, when radial support is used, The distance between the two shielding cylinders is small, so the radial support will cause the electric field in the through-wall sleeve to abruptly change at the radial support setting, thereby causing the local electric field strength in the through-wall casing to be excessive;
  • the connection structure of the insulating rod and the two sleeves for axial support will affect the distribution of the electric field in the through-wall sleeve, so that the electric field distribution in the through-wall sleeve is not uniform, and thus the specific electric field in the through-wall sleeve The strength is too large.
  • the invention provides a shielding structure for an ultra-high voltage direct current wall bushing, which aims to solve the problem that the connection structure of the shielding cylinder and the insulating rod for axial support in the prior art affects the electric field distribution in the through-wall bushing.
  • the utility model relates to a shielding structure for an ultra-high voltage direct current wall bushing, which comprises an inner shielding tube and an outer shielding tube which are coaxially sleeved, one end of the inner shielding tube protrudes from one end of the outer shielding tube, and the outer shielding tube is close to the inner shielding tube
  • the opening at one end of the projecting end is a flared opening, and the edge of the flared opening has an annular flap which is hooked back to the small end thereof, and the annular turn edge is fixed between the small end of the flared opening
  • the opening of the opening faces the same direction, and the horn-shaped sleeve has an annular
  • the insulating rod is fixed on the annular fixing plate by a screw provided on the annular fixing plate and a correspondingly threaded hole in the insert provided at the end of the insulating rod.
  • the insulating rod is correspondingly processed by a screw which is screwed on the edge of the flared sleeve and an insert provided at the end of the insulating rod
  • the threaded holes are fixed to the rim of the flared sleeve.
  • the openings of the ends of the inner shield cylinder and the outer shield cylinder are all flared openings.
  • the invention also provides an ultra-high pressure wall bushing equipped with the shielding structure, the technical scheme of the UHV wall bushing is as follows - an UHV wall bushing, comprising a wall through the wall and through the wall a shielding structure disposed in the cylinder body, the shielding structure comprises a coaxially sleeved inner shielding cylinder and an outer shielding cylinder, one end of the inner shielding cylinder protrudes from one end of the outer shielding cylinder, and the outer shielding cylinder is adjacent to the inner shielding cylinder
  • the opening at one end of the protruding end is a flared opening, and the edge of the flared opening has an annular flap that is hooked back toward the small end thereof, and the annular flap is provided with an outer shield between the small end of the flared opening
  • the annular fixing plate is wrapped by the annular lap of the edge of the outer shielding cylinder, and the other end of the supporting column is fixed to the horn sleeve through the gap between the annular rim of the horn casing and the outer circumference of the horn casing
  • the rim of the tube is wrapped by a circular flap along the rim of the flared sleeve.
  • the inner shielding cylinder and the outer shielding cylinder are at least two, and all the inner shielding cylinder and the outer shielding cylinder are coaxially sleeved.
  • the insulating rod is fixed on the annular fixing plate by a screw provided on the annular fixing plate and a correspondingly threaded hole in the insert provided at the end of the insulating rod.
  • the insulating rod is fixed to the edge of the stalk sleeve by a screw provided on the rim of the horn sleeve and a correspondingly threaded hole in the insert provided at the end of the insulating rod.
  • the openings of the ends of the inner shield cylinder and the outer shield cylinder are all flared openings.
  • One end of the insulating rod for axial support in the present invention is wrapped by an annular turn edge of the horn of the flared opening at the end of the outer shield cylinder, and the other end is provided by the edge of the horn-shaped sleeve fixed on the outer circumference of the inner shield cylinder
  • the ring-turning edge wraps the connecting structure of the insulating rod and the shielding tube to form an annular shielding structure. In use, since both ends of the insulating rod are wrapped, the connection structure of the insulating rod and the shielding tube is prevented from affecting the wall sleeve.
  • Figure 1 is a schematic structural view of an embodiment of the present invention
  • 2 is a schematic view showing the connection structure between the inner and outer shielding cylinders of FIG. 1.
  • Embodiment of the shielding structure for the UHV DC wall bushing of the present invention As shown in FIG. 1 and FIG. 2, the shielding structure is mainly provided by the inner shielding cylinder 1, the outer shielding cylinder 2 and the inner and outer shielding tubes 1, 2.
  • the insulating rod 5 functions as an axial support, and an insert 4 is embedded at each end of the insulating rod 5.
  • the inner shield cylinder 1 and the outer shield cylinder 2 are coaxially sleeved together, and one end of the inner shield cylinder 1 is shielded from the outer shield One end of 2 protrudes, and the end openings of the inner and outer shielding cylinders 1, 2 are all flared openings, and the inner shielding cylinder is adjacent to one end of the flared sleeve 6, and the edge of the flared opening has a ring hooked back to the small end thereof.
  • the gusset, the annular gusset of the rim of the outer shield cylinder 2 and the small end of the flared opening are provided with an annular fixing plate 3 fixed to the outer circumference of the outer shield cylinder 2.
  • the outer circumference of the end portion of the inner shield cylinder 1 projecting from one end of the outer shield cylinder 2 is fixed with a flared opening corresponding to the corresponding end of the outer shield cylinder 2.
  • the flared sleeve 6, that is, the opening of the flared opening of the flared sleeve 6 faces the same as the opening of the flared opening of the corresponding end of the outer shield cylinder 2, and also has a small end hook on the edge of the flared sleeve 6
  • the looped turn edge has a certain gap between the annular turn and the outer circumference of the flared sleeve 6.
  • the insulating rod 5 is disposed between the outer shielding tube 2 and the horn-like sleeve 6, and the axis of the insulating rod 5 is parallel to the axis of the outer shielding tube 2, and one end of the insulating rod 5 passes through the horn-like opening of the corresponding end of the outer shielding tube 2.
  • the through hole formed in the annular lap is fixed on the annular fixing plate 3, and the other end is fixed to the horn casing 6 through the gap between the annular rim of the horn casing 6 and the outer circumference of the horn casing 6.
  • the edges of the annular fixing plate 3 and the flared sleeve 6 are fixedly connected to the insert 4 in the insulating rod 5 by screws which are screwed on the two. Meanwhile, one end of the insulating rod 5 is wrapped by the annular turn edge of the horn of the flared opening at the end of the outer shield cylinder 2, and the other end is turned by the edge of the horn of the horn-shaped sleeve 6 fixed on the outer circumference of the inner shield cylinder 1. The wrapping is carried out to avoid the problem that the connection structure between the insulating rod 5 and the inner and outer shielding cylinders 1, 2 affects the electric field distribution in the through-wall casing during use.
  • the above axial support structures are connected to each other.
  • the two ends of the insulating rod are respectively fixed on the annular fixing plate and the horn casing by screws.
  • the two ends of the insulating rod may also be riveted to the annular fixing plate and the horn casing respectively. On the edge.
  • the through-wall bushing mainly comprises a through-wall pipe body and a shielding structure, wherein the shielding structure is in the interior of the through-wall cylinder body, and the specific structure and components of the shielding structure The connection relationship between them has been explained in the above embodiment, and therefore will not be described in detail in the present invention.
  • the shielding structure is mainly composed of an inner shielding cylinder and an outer shielding cylinder.
  • the shielding structure may also be composed of more than two shielding cylinders, wherein the connection relationship between the adjacent two shielding cylinders is The connection relationship with the inner and outer shielding cylinders is the same.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)

Abstract

一种特高压直流穿墙套管及其屏蔽结构，该屏蔽结构包括同轴套设的内屏蔽筒（1）和外屏蔽筒（2），外屏蔽筒的一端为喇叭状开口，喇叭状开口的边沿具有环形翻沿，喇叭状开口的小端的外周上固定有环形固定板（3）；内屏蔽筒的外周上固定有喇叭状套筒（6），喇叭状套筒的边沿也具有环形翻沿；屏蔽结构还包括轴向设置的支撑柱（5），支撑柱一端固定在环形固定板上，另一端固定在喇叭状套筒的边沿上。使用时，支撑柱的一端被外屏蔽筒的喇叭状开口的环形翻沿包裹，另一端被喇叭状套筒的环形翻沿包裹，由于支撑柱与屏蔽筒的连接结构均处于环形屏蔽结构之内，避免了支撑柱与屏蔽筒的连接结构影响穿墙套管内的电场分布。

Description

一种特高压直流穿墙套管及其屏蔽结构 技术领域
本发明涉及特高压电力设施中一种特高压直流穿墙套管， 同时还涉及一种特高压穿墙套 管用屏蔽结构。
背景技术
目前， 特高压穿墙套管多采用由两个同轴套设的屏蔽筒构成的屏蔽结构， 两个屏蔽筒之 间采用轴向或径向的支撑， 其中， 在采用径向支撑时， 由于两个屏蔽筒之间的距离小， 因此 径向支撑会导致穿墙套筒中的电场于径向支撑设置处会发生突变， 从而造成穿墙套管内局部 电场强度过大； 而在采用轴向支撑时， 用于轴向支撑的绝缘棒与两个套筒的连接结构会影响 穿墙套筒内电场的分布， 使得穿墙套筒内电场分布不均匀， 进而使得穿墙套筒内具体电场强 度过大。
发明内容
本发明提出了一种特高压直流穿墙套管用屏蔽结构， 旨在解决现有技术中屏蔽筒和用于 轴向支撑的绝缘棒的连接结构会影响穿墙套管内电场分布的问题。
该特高压直流穿墙套管用屏蔽结构的技术方案如下：
一种特高压直流穿墙套管用屏蔽结构， 包括同轴套设的内屏蔽筒和外屏蔽筒， 内屏蔽筒 的一端从外屏蔽筒的一端伸出， 所述外屏蔽筒于靠近内屏蔽筒的伸出端的一端的开口为喇叭 状开口， 所述喇叭状开口的边沿具有向其小端勾回的环形翻沿， 所述环形翻沿与喇叭状的开 口的小端之间设置有固定在外屏蔽筒的外周上的环形固定板； 所述内屏蔽筒于伸出端的外周 上固定有喇叭状套筒， 所述喇叭状套管的喇叭状开口的开口朝向与内屏蔽筒的对应端的喇叭 状开口的开口朝向相同， 喇叭状套筒于远离内屏蔽筒的边沿具有向喇叭状套筒的小端勾回的 环形翻沿， 所述环形翻沿与喇叭状套管的外周之间具有间隙； 所述屏蔽结构还包括于喇叭状 套筒与外屏蔽筒之间设置的与外屏蔽筒的轴线平行布设的支撑柱， 所述支撑柱的一端穿过外 屏蔽筒的边沿上开设的通孔固定在环形固定板上， 并被外屏蔽筒的边沿具有的环形翻沿包 裹， 支撑柱的另一端穿过喇叭状套管的环形翻沿与喇叭状套管的外周之间的间隙固定在喇叭 状套管的边沿上， 并被喇叭状套管的边沿具有的环形翻沿包裹。
所述绝缘棒通过环形固定板上旋设的螺钉和绝缘棒端部设置的嵌件中对应加工的螺紋孔 固定在环形固定板上。
所述绝缘棒通过喇叭状套筒的边沿上旋设的螺钉和绝缘棒端部设置的嵌件中对应加工的 螺纹孔固定在喇叭状套筒的边沿上。
所述内屏蔽筒和外屏蔽筒的端部的开口均为喇叭状开口。
本发明还提供了一种装设有该屏蔽结构的特高压穿墙套管， 该特高压穿墙套管的技术方 案如下- 一种特高压穿墙套管， 包括穿墙筒体和穿墙筒体内设置的屏蔽结构， 所述屏蔽结构包括 同轴套设的内屏蔽筒和外屏蔽筒， 内屏蔽筒的一端从外屏蔽筒的一端伸出， 所述外屏蔽筒于 靠近内屏蔽筒的伸出端的一端的开口为喇叭状开口， 所述喇叭状开口的边沿具有向其小端勾 回的环形翻沿， 所述环形翻沿与喇叭状的开口的小端之间设置有固定在外屏蔽筒的外周上的 环形固定板； 所述内屏蔽筒于伸出端的外周上固定有喇叭状套筒， 所述喇叭状套管的喇叭状 开口的开口朝向与内屏蔽筒的对应端的喇叭状开口的开口朝向相同， 喇叭状套筒于远离内屏 蔽筒的边沿具有向喇叭状套筒的小端勾回的环形翻沿， 所述环形翻沿与喇叭状套管的外周之 间具有间隙； 所述屏蔽结构还包括于喇叭状套筒与外屏蔽筒之间设置的与外屏蔽筒的轴线平 行布设的支撑柱， 所述支撑柱的一端穿过外屏蔽筒的边沿上开设的通孔固定在环形固定板 上， 并被外屏蔽筒的边沿具有的环形翻沿包裹， 支撑柱的另一端穿过喇叭状套管的环形翻沿 与喇叭状套管的外周之间的间隙固定在喇叭状套管的边沿上， 并被喇叭状套管的边沿具有的 环形翻沿包裹。
所述内屏蔽筒和外屏蔽筒为至少两个， 且所有内屏蔽筒和外屏蔽筒同轴套设。
所述绝缘棒通过环形固定板上旋设的螺钉和绝缘棒端部设置的嵌件中对应加工的螺紋孔 固定在环形固定板上。
所述绝缘棒通过喇叭状套筒的边沿上旋设的螺钉和绝缘棒端部设置的嵌件中对应加工的 螺纹孔固定在瘌叭状套筒的边沿上。
所述内屏蔽筒和外屏蔽筒的端部的开口均为喇叭状开口。
本发明中用于轴向支撑的绝缘棒的一端被外屏蔽筒端部的喇叭状开口的边沿具有的环形 翻沿包裹， 另一端被内屏蔽筒的外周上固定的喇叭状套筒的边沿具有的环形翻沿包裹， 使绝 缘棒与屏蔽筒的连接结构构成环形屏蔽结构， 在使用时， 由于绝缘棒的两端均被包裹， 因此 避免了绝缘棒与屏蔽筒的连接结构影响穿墙套筒内电场分布的问题， 从而提高了穿墙套管的 整体质量， 延长了穿墙套管的使用寿命， 减少了穿墙套筒在使用过程中发生事故的概率。 同 时， 由于该屏蔽结构中， 绝缘棒的结构简单、 容易加工， 从而降低了屏蔽结构的制造成本。 附图说明
图 1是本发明的实施例的结构示意图； 图 2是图 1中内外屏蔽筒之间的连接结构示意图。
具体实施方式
本发明的特高压直流穿墙套管用屏蔽结构的实施例： 如图 1和图 2所示， 该屏蔽结构主 要由内屏蔽筒 1， 外屏蔽筒 2和内外屏蔽管 1， 2之间设置的起到轴向支撑作用的绝缘棒 5构 成， 绝缘棒 5两端各嵌一个嵌件 4， 内屏蔽筒 1和外屏蔽筒 2同轴套设一起， 并且内屏蔽筒 1 的一端从外屏蔽筒 2 的一端伸出， 内外屏蔽筒 1， 2 的端部开口均为喇叭状开口， 在内屏 蔽筒靠近喇叭状套管 6的一端， 其喇叭状开口的边沿具有向其小端勾回的环形翻沿， 外屏蔽 筒 2的边沿的环形翻沿与喇叭状开口的小端之间设置有固定在外屏蔽筒 2的外周上的环形固 定板 3。 同时， 在内屏蔽筒 1的从外屏蔽筒 2的一端伸出的端部的外周 （也就是在外屏蔽筒 2的伸出端） 上固定有与外屏蔽筒 2的对应端的喇叭状开口相应的喇叭状套管 6， 即喇叭状 套管 6的喇叭状开口的开口朝向与外屏蔽筒 2的对应端的喇叭状开口的开口朝向相同， 在喇 叭状套管 6的边沿也具有向其小端勾回的环形翻沿， 该环形翻沿与喇叭状套管 6的外周之 间具有一定的间隙。 而绝缘棒 5就设置在外屏蔽筒 2与喇叭状套管 6之间， 并且绝缘棒 5的 轴线与外屏蔽筒 2的轴线平行， 绝缘棒 5的一端通过外屏蔽筒 2的对应端的喇叭状开口的环 形翻沿上开设的通孔固定在环形固定板 3上， 另一端穿过喇叭状套管 6的环形翻沿与喇叭状 套管 6的外周之间的间隙固定在喇叭状套管 6的边沿上， 而环形固定板 3和喇叭状套管 6的 边沿分别通过两者上旋设的螺钉与绝缘棒 5中的嵌件 4固定连接。 同时， 绝缘棒 5的一端被 外屏蔽筒 2端部的喇叭状开口的边沿具有的环形翻沿包裹， 另一端被内屏蔽筒 1的外周上固 定的喇叭状套管 6的边沿具有的环形翻沿包裹， 从而避免了在使用过程中， 绝缘棒 5与内外 屏蔽筒 1, 2的连接处的连接结构影响穿墙套管内电场分布的问题。
在上述实施例中， 屏蔽筒为两个， 在其他实施例中， 屏蔽筒也可以多于两个， 但是所有 屏蔽筒之间应当同轴套设在一起， 相邻两个屏蔽筒之间通过上述轴向支撑结构相互连接。
在上述实施例中， 绝缘棒的两端分别通过螺钉固定在环形固定板和喇叭状套管上， 在其 他实施例中， 绝缘棒的两端也可以分别铆接在环形固定板和喇叭状套管的边沿上。
本发明的特高压穿墙套管的实施例： 该穿墙套管主要有穿墙管体和屏蔽结构构成， 其中 屏蔽结构处于穿墙筒体的内部， 而屏蔽结构的具体构成和各组成部件之间的连接关系已经在 上述实施例中说明， 因此在本发明中不再详述。
在上述实施例中， 屏蔽结构主要由内屏蔽筒和外屏蔽筒构成， 在其他实施例中， 屏蔽结构也 可以多于两个的屏蔽筒构成， 其中相邻两个屏蔽筒之间的连接关系与内外屏蔽筒之间的连接 关系相同。

Claims

1. 一种特高压直流穿墙套管用屏蔽结构，包括同轴套设的内屏蔽筒和外屏蔽筒, 内屏蔽筒的一端从外屏蔽筒的一端伸出，其特征在于：所述外屏蔽筒于靠近内屏 蔽筒的伸出端的一端的开口为喇叭状开口，所述喇叭状开口的边沿具有向其小端 勾回的环形翻沿，所述环形翻沿与喇叭状的开口的小端之间设置有固定在外屏蔽 筒的外周上的环形固定板； 所述内屏蔽筒于伸出端的外周上固定有喇叭状套筒， 所述喇叭状套管的喇叭状开口的开口朝向与内屏蔽筒的对应端的喇叭状开口的 开口朝向相同，喇叭状套筒于远离内屏蔽筒的边沿具有向喇叭状套筒的小端勾回 的环形翻沿，所述环形翻沿与喇叭状套管的外周之间具有间隙；所述屏蔽结构还 包括于喇叭状套筒与外屏蔽筒之间设置的与外屏蔽筒的轴线平行布设的支撑柱， 所述支撑柱的一端穿过外屏蔽筒的边沿上开设的通孔固定在环形固定板上，并被 外屏蔽筒的边沿具有的环形翻沿包裹，支撑柱的另一端穿过喇叭状套管的环形翻 沿与喇叭状套管的外周之间的间隙固定在喇叭状套管的边沿上，并被喇叭状套管 的边沿具有的环形翻沿包裹。
2. 根据权利要求 1所述的特高压直流穿墙套管用屏蔽结构， 其特征在于： 所述 绝缘棒通过环形固定板上旋设的螺钉和绝缘棒端部设置的嵌件中对应加工的螺 紋孔固定在环形固定板上。
3. 根据权利要求 1所述的特高压直流穿墙套管用屏蔽结构， 其特征在于： 所述 绝缘棒通过喇叭状套筒的边沿上旋设的螺钉和绝缘棒端部设置的嵌件中对应加 工的螺紋孔固定在喇叭状套筒的边沿上。
4. 根据权利要求 1或 2或 3所述的特高压直流穿墙套管用屏蔽结构， 其特征在 于： 所述内屏蔽筒和外屏蔽筒的端部的开口均为喇叭状开口。
5. 一种装设有权利要求 1所述的屏蔽结构的特高压穿墙套管， 包括穿墙筒体和 穿墙筒体内设置的屏蔽结构， 所述屏蔽结构包括同轴套设的内屏蔽筒和外屏蔽 筒， 内屏蔽筒的一端从外屏蔽筒的一端伸出， 其特征在于： 所述外屏蔽筒于靠近 内屏蔽筒的伸出端的一端的开口为喇叭状开口，所述喇叭状开口的边沿具有向其 小端勾回的环形翻沿，所述环形翻沿与喇叭状的开口的小端之间设置有固定在外 屏蔽筒的外周上的环形固定板；所述内屏蔽筒于伸出端的外周上固定有喇叭状套 筒，所述喇叭状套管的喇叭状开口的开口朝向与内屏蔽筒的对应端的喇叭状开口 的开口朝向相同，喇叭状套筒于远离内屏蔽筒的边沿具有向喇叭状套筒的小端勾 回的环形翻沿，所述环形翻沿与喇叭状套管的外周之间具有间隙； 所述屏蔽结构 还包括于喇叭状套筒与外屏蔽筒之间设置的与外屏蔽筒的轴线平行布设的支撑 柱， 所述支撑柱的一端穿过外屏蔽筒的边沿上开设的通孔固定在环形固定板上， 并被外屏蔽筒的边沿具有的环形翻沿包裹，支撑柱的另一端穿过喇叭状套管的环 形翻沿与喇叭状套管的外周之间的间隙固定在喇叭状套管的边沿上，并被喇叭状 套管的边沿具有的环形翻包裹。
6. 根据权利要求 5所述的特高压直流穿墙套管，其特征在于：所述内屏蔽筒和 / 或外屏蔽筒为至少两个， 且所有内屏蔽筒和外屏蔽筒同轴套设。
7. 根据权利要求 5所述的特高压直流穿墙套管， 其特征在于： 所述绝缘棒通过 环形固定板上旋设的螺钉和绝缘棒端部设置的嵌件中对应加工的螺紋孔固定在 环形固定板上。
8. 根据权利要求 5所述的特高压直流穿墙套管， 其特征在于： 所述绝缘棒通过 喇叭状套筒的边沿上旋设的螺钉和绝缘棒端部设置的嵌件中对应加工的螺纹孔 固定在喇叭状套筒的边沿上。
9. 根据权利要求 5至 8任意一项所述的特高压直流穿墙套管， 其特征在于： 所 述内屏蔽筒和外屏蔽筒的端部的开口均为喇叭状开口。
PCT/CN2012/000897 2011-12-15 2012-06-30 一种特高压直流穿墙套管及其屏蔽结构 WO2013086774A1 (zh)

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