WO2018036082A1 - 一种特高压直流穿墙套管 - Google Patents

一种特高压直流穿墙套管 Download PDF

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Publication number
WO2018036082A1
WO2018036082A1 PCT/CN2017/070401 CN2017070401W WO2018036082A1 WO 2018036082 A1 WO2018036082 A1 WO 2018036082A1 CN 2017070401 W CN2017070401 W CN 2017070401W WO 2018036082 A1 WO2018036082 A1 WO 2018036082A1
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electrode
bushing
wall
sub
insulating portion
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PCT/CN2017/070401
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English (en)
French (fr)
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虞育号
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江苏智达高压电气有限公司
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Publication of WO2018036082A1 publication Critical patent/WO2018036082A1/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
    • H01B17/56—Insulating bodies
    • H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
    • H01B17/583—Grommets; Bushings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin

Definitions

  • the invention relates to an ultra-high voltage bushing, in particular to a novel structure UHV DC wall bushing.
  • the DC through-wall bushings at home and abroad are made of rubber-impregnated paper capacitors, which are generally composed of two adhesive-impregnated paper capacitor sleeves, and the lower insulation is filled with SF6 gas insulation.
  • the casing has heavy weight, long production cycle and high price. Due to the uneven distribution of external voltage of the DC bushing, the casing manufacturer generally increases the dry arc distance of the outer insulation to solve the problem, which not only increases the cost of the product, but also increases the product. The difficulty of manufacturing.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an ultra-high voltage DC wall bushing, which has short production cycle, light weight, low manufacturing cost, high bending strength, and safe and reliable operation. Significantly improve electrical performance.
  • the ultra-high voltage DC through-wall bushing comprises: an insulating portion fixed to both sides of the grounding cylinder, a high-voltage electrode penetrating the insulating portion, and a grounding electrode fixed to the inner wall of the grounding cylinder,
  • the insulating portion has at least two adjacent sub-casings, and the adjacent sub-casings are integrally fixed by a transition plate, and the through-wall sleeve is internally disposed between the ground electrode and the high voltage electrode.
  • the middle electrode is fixed at two ends of the intermediate electrode by two transition plates, and the inner surface of the sub-casing is evenly wound around the enamel-resisting wire.
  • the present invention also has the following features:
  • the outer end of the insulating portion is provided with an end plate.
  • the surface of the sub-casing is attached with a silicone rubber umbrella cover.
  • the grounding cylinder is equipped with a final screen measuring terminal, a current transformer and a flange structure for mounting on the wall.
  • the sub-casing is made of FRP.
  • the sub-casing is glued and fixedly connected with the transition plate and the end plate.
  • the high voltage electrode is shorted to the upper end plate and the lower end plate, and the middle electrode is shorted to the upper end transition plate and the lower end transition plate.
  • the casing is filled with insulating gas.
  • the insulating gas is sulfur hexafluoride.
  • the insulating portion of the two ends of the invention is divided into two or more sub-casings, and the middle is connected by a transition plate.
  • the sub-casing material is made of glass reinforced plastic, and the outer surface is provided with a silicone rubber umbrella sleeve, so as to solve the uneven voltage of the outer surface caused by the sub-casing
  • the enamel electric resistance wire is evenly wound on the inner surface of the sub-casing. This enamel-coated electric resistance wire can make the surface resistance distribution of the sub-casing more uniform. When space charge occurs at the high pressure, it can be released by the enamel electric resistance wire, which greatly improves The PD performance of the product.
  • Each component directly adopts a plastic structure, which increases the overall strength of the product, shortens the production cycle, and reduces the weight (only the oil-paper capacitive wall-through One-quarter of the casing weight), reduced manufacturing costs, high flexural strength and safe and reliable operation.
  • the high voltage electrode acts as a jacket-loaded current-carrying conductor and is at a high potential.
  • the middle electrode and the transition plates at both ends are connected, and the three are equipotential, and the voltage at the intermediate electrode is about half of the voltage of the high voltage electrode by design calculation.
  • the ground electrode is connected to the grounding barrel and is at ground potential. Ensure the overall electrical performance of the bushing.
  • FIG. 1 is a schematic structural view of a UHV DC wall bushing according to the present invention.
  • the ultra-high voltage DC through-wall bushing of the embodiment includes: an insulating portion fixed to both sides of the grounding cylinder, a high-voltage electrode penetrating through the insulating portion, and a grounding electrode fixed to the inner wall of the grounding cylinder.
  • the grounding cylinder is equipped with a terminal measuring terminal, a current transformer and a flange structure for mounting on the wall.
  • the sleeve is sealed by the spring structure 7 and the seal to seal the end of the sleeve, and the sleeve is filled with SF6 insulating gas 10.
  • the outer end of the insulating portion is provided with an end plate.
  • the insulating part has two sub-sleeves: the upper insulating section and the lower insulating section, and the insulating upper section and the insulating lower section are fixed together by the transition plate. .
  • the upper surface of the insulation and the lower surface of the insulation are provided with a silicone rubber umbrella sleeve, and the inner surface of the insulation upper section and the inner surface of the insulation lower section are evenly wound around the enamel-resistance resistance wire, so that the surface resistance distribution of the outer insulation surface can be uniformly released, and the harmful space charge is released in time.
  • the inner wall of the wall bushing is provided with an intermediate electrode between the ground electrode and the high voltage electrode, and the two ends of the middle electrode are respectively fixed by two transition plates.
  • the upper insulating section and the lower insulating section are made of FRP material, and the end plate, the insulating upper section, the transition board, and the insulating lower section are fixedly connected.
  • the through-wall bushing of this example is provided with a shield ring at the outer end of the end plate.
  • the high voltage electrode 1 acts as a sleeve-loaded current-carrying conductor and is short-circuited to the end plate and is at a high potential.
  • the ground electrode 3 and the grounding cylinder 6 are connected to be at ground potential.
  • the intermediate electrode 2 is short-circuited with the transition plates at both ends, and the three are equipotential.
  • the present invention may have other embodiments.
  • the structure of the present invention is applied to an outer wall of an electric porcelain through-wall bushing, and any technical solution formed by equivalent replacement or equivalent transformation falls within the protection range required by the present invention.

Abstract

一种特高压直流穿墙套管，包括：固定于接地筒(6)两侧的绝缘部分，贯穿所述绝缘部分的高压电极(1)，和固定在接地筒(6)内壁的接地电极(3)，绝缘部分至少具有两个相邻的子套管，相邻子套管之间通过过渡板(4)固定为一体，穿墙套管内部设置有介于接地电极(3)和高压电极(1)之间的中间电极(2)，所述中间电极(2)的两端分别通过两个过渡板(4)固定。和传统直流穿墙套管相比，该套管具有生产周期短、重量轻、制造成本低、抗弯强度高、运行安全可靠和显著提高电气性能等优点。

Description

一种特高压直流穿墙套管 技术领域
本发明涉及一种特高压套管，具体的说是一种新型结构特高压直流穿墙套管。
背景技术
随着国民经济的发展，居民和工业用电量的激增，输送电线路电压等级向超高压和特高压方向发展，国内开始建设特高压1100kV交流输送电线路和±800kV直流输送线路，并规划建设±1100kV直流输送线路，因此和输送电线路相配套的特高压直流套管有广阔的市场前景。
现在国内外直流穿墙套管采用胶浸纸电容式，一般采用两根胶浸纸电容式套管联结组成，下绝缘处充SF6气体绝缘。这种套管重量重，生产周期长，价格高，直流套管由于外部电压分布不均匀，套管制造厂普遍增加外绝缘干弧距离来解决，这样不仅增加了产品的成本，也增加了产品的制造难度。
发明内容
本发明所要解决的技术问题是，克服现有技术的不足，提供一种特高压直流穿墙套管，该套管生产周期短、重量轻、制造成本低、抗弯强度高、运行安全可靠，显著提高电气性能。
为了解决以上技术问题，本发明提供的特高压直流穿墙套管，包括：固定于接地筒两侧的绝缘部分，贯穿所述绝缘部分的高压电极，和固定在接地筒内壁的接地电极，其特征在于：所述绝缘部分至少具有两个相邻的子套管，相邻子套管之间通过过渡板固定为一体，所述穿墙套管内部设置有介于接地电极和高压电极之间的中间电极，所述中间电极的两端分别通过两个过渡板固定，子套管内表面均匀缠绕漆包电阻丝。
为了进一步解决以上技术问题，本发明还具有如下特征：
1、所述绝缘部分外端设置有端板。
2、所述子套管表面附有硅橡胶伞套。
3、接地筒处装有末屏测量端子、电流互感器和用于安装在墙体的法兰结构。
4、所述子套管为玻璃钢材质。
5、所述子套管与过渡板和端板之间胶装固定连接。
6、高压电极与上端板和下端板短接，中间电极与上端过渡板和下端过渡板短接。
7、套管内充有绝缘气体。
8、所述绝缘气体为六氟化硫。
本发明两端绝缘部分分为两个或多个子套管，中间通过过渡板连接，子套管材质为玻璃钢，外表面附有硅橡胶伞套，为解决子套管导致的外表面电压不均匀情况，在子套管内表面均匀缠绕漆包电阻丝，这层漆包电阻丝可以使子套管表面电阻分布更加均匀，当高压处有空间电荷出现时，可以通过漆包电阻丝释放，大大提高产品的局放性能。各零部件直接采用胶装结构，增加了产品的整体强度，生产周期变短，重量变轻(仅为油纸电容式穿墙 套管重量的四分之一)，制造成本降低、抗弯强度高和运行安全可靠。
高压电极作为套管载压载流导体，处于高电位。中间电极和两端过渡板连接，三者等电位，通过设计计算，使中间电极处电压约为高压电极电压的一半。接地电极和接地筒连接，处于地电位。保证套管的整体电气性能。
附图说明
图1为本发明特高压直流穿墙套管结构示意图。
图中标号示意如下：
1-高压电极，2-中间电极，3-接地电极，4-过渡板，6-接地筒，7-弹簧结构，81-绝缘上节，82-绝缘下节，83-硅橡胶伞套，9-漆包电阻丝；10-绝缘气体，11-端板。
具体实施方式
下面结合实施例对本发明作进一步详细描述。但是本发明不限于所给出的例子。
如图1所示，本实施例特高压直流穿墙套管，包括：固定于接地筒两侧的绝缘部分，贯穿绝缘部分的高压电极，和固定在接地筒内壁的接地电极。接地筒处装有末屏测量端子、电流互感器和用于安装在墙体的法兰结构。套管通过弹簧结构7和密封件保证套管端部的密封，套管内充SF6绝缘气体10。绝缘部分外端设置有端板。以图中上方的绝缘部分为例(接地筒两侧绝缘结构相同)，绝缘部分具有两个子套管：绝缘上节和绝缘下节，绝缘上节和绝缘下节之间通过过渡板固定为一体。绝缘上节和绝缘下节表面附有硅橡胶伞套，绝缘上节和绝缘下节内表面均匀缠绕漆包电阻丝,可以均匀外绝缘表面电阻分布，及时释放有害空间电荷。穿墙套管内部设置有介于接地电极和高压电极之间的中间电极，中间电极的两端分别通过两个过渡板固定。本实施例中，绝缘上节和绝缘下节为玻璃钢材质，端板、绝缘上节、过渡板、绝缘下节胶装固定连接。如图所示，本例的穿墙套管在端板的外端设有屏蔽环。
高压电极1作为套管载压载流导体，与端板短接，处于高电位。接地电极3和接地筒6连接，处于地电位。中间电极2与两端的过渡板短接，三者等电位，通过设计计算，可以使电压约为高电压一半。保证套管的整体电气性能。
除上述实施例外，本发明还可以有其他实施方式。比如本发明结构运用在电瓷外绝缘穿墙套管，凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。

Claims (9)

  1. 一种特高压直流穿墙套管，包括：固定于接地筒两侧的绝缘部分，贯穿所述绝缘部分的高压电极，和固定在接地筒内壁的接地电极，其特征在于：所述绝缘部分至少具有两个相邻的子套管，相邻子套管之间通过过渡板固定为一体，所述穿墙套管内部设置有介于接地电极和高压电极之间的中间电极，所述中间电极的两端分别通过两个过渡板固定，子套管内表面均匀缠绕漆包电阻丝。
  2. 根据权利要求1所述的特高压直流穿墙套管，其特征在于：所述绝缘部分外端设置有端板。
  3. 根据权利要求1所述的特高压直流穿墙套管，其特征在于：所述子套管表面附有硅橡胶伞套。
  4. 根据权利要求1所述的特高压直流穿墙套管，其特征在于：接地筒处装有末屏测量端子、电流互感器和用于安装在墙体的法兰结构。
  5. 根据权利要求1所述的特高压直流穿墙套管，其特征在于：所述子套管为玻璃钢材质。
  6. 根据权利要求1所述的特高压直流穿墙套管，其特征在于：所述子套管与过渡板和端板之间胶装固定连接。
  7. 根据权利要求1所述的特高压直流穿墙套管，其特征在于：高压电极与上端板和下端板短接，中间电极与上端过渡板和下端过渡板短接。
  8. 根据权利要求1-7任一项所述的特高压直流穿墙套管，其特征在于：套管内充有绝缘气体。
  9. 根据权利要求8所述的特高压直流穿墙套管，其特征在于：所述绝缘气体为六氟化硫。
PCT/CN2017/070401 2016-08-22 2017-01-06 一种特高压直流穿墙套管 WO2018036082A1 (zh)

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WO2023045055A1 (zh) * 2021-09-22 2023-03-30 中国南方电网有限责任公司超高压输电公司检修试验中心 一种800kV柔性直流穿墙套管

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CN206116175U (zh) * 2016-08-22 2017-04-19 江苏智达高压电气有限公司 一种特高压直流变压器套管
CN106099794A (zh) * 2016-08-22 2016-11-09 江苏智达高压电气有限公司 一种特高压直流穿墙套管
CN106782940A (zh) * 2017-01-24 2017-05-31 江苏智达高压电气有限公司 一种电阻分压的高压直流套管
CN106940415B (zh) * 2017-02-07 2020-09-25 中国南方电网有限责任公司超高压输电公司检修试验中心 带有测量端子和末屏接地端子的电容性套管的检测系统
CN106771410B (zh) * 2017-02-27 2019-09-24 国网上海市电力公司 一种穿越式绝缘引线管
CN107342143A (zh) * 2017-08-08 2017-11-10 江苏智达高压电气有限公司 一种线绕电阻分压的直流变压器套管或穿墙套管
CN108152607B (zh) * 2017-12-28 2021-01-15 中国电力科学研究院有限公司 绝缘套管表面电荷测量装置及系统

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CN204559041U (zh) * 2015-05-14 2015-08-12 国家电网公司 高压复合绝缘穿墙套管
CN106099794A (zh) * 2016-08-22 2016-11-09 江苏智达高压电气有限公司 一种特高压直流穿墙套管
CN106205980A (zh) * 2016-08-22 2016-12-07 江苏智达高压电气有限公司 一种特高压交流变压器套管

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WO2023045055A1 (zh) * 2021-09-22 2023-03-30 中国南方电网有限责任公司超高压输电公司检修试验中心 一种800kV柔性直流穿墙套管

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