WO2014044080A1 - 一种采用分体式同轴结构安装的标准电容器 - Google Patents

一种采用分体式同轴结构安装的标准电容器 Download PDF

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Publication number
WO2014044080A1
WO2014044080A1 PCT/CN2013/080267 CN2013080267W WO2014044080A1 WO 2014044080 A1 WO2014044080 A1 WO 2014044080A1 CN 2013080267 W CN2013080267 W CN 2013080267W WO 2014044080 A1 WO2014044080 A1 WO 2014044080A1
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Prior art keywords
electrode
assembly
voltage
low
voltage electrode
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PCT/CN2013/080267
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English (en)
French (fr)
Inventor
章述汉
袁建平
周峰
姜春阳
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Corp of China SGCC
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Corp of China SGCC
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Publication of WO2014044080A1 publication Critical patent/WO2014044080A1/zh
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/005—Electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/10—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/224—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/28—Tubular capacitors

Definitions

  • the invention relates to a standard capacitor installed by using a split coaxial structure, belonging to the technical field of electric power testing equipment, and particularly suitable for the field of high voltage precision measurement in a laboratory and field test. Background technique
  • Standard capacitors are used for high voltage equipment testing and verification and are a must-have standard equipment in high voltage laboratories.
  • the overall structure of the standard capacitor is mostly inverted structure, that is, the high and low voltage electrodes are at the upper end of the whole device.
  • the standard capacitor has a simple structure and is easy to implement.
  • due to the concentrated voltage at the top of the device the field strength of the insulated tube is severely distorted, and the field strength distribution is difficult to adjust, resulting in many high voltage capacitors having to be stepped down.
  • the corresponding vertical type (ie, the high and low voltage electrodes are at the lower end of the device) standard capacitors solve this problem. Because the vertical standard capacitors can place the high and low voltage electrodes in the bottom closed metal casing, the field strength is well solved. The problem of external insulation caused by the distortion of the bow I.
  • the structure of the high and low voltage electrodes and the shielding assembly and the mounting and fixing thereof are complicated, and the coaxiality of the high and low pressure electrodes is difficult to ensure, so that the corresponding parameters of the capacitor such as the voltage coefficient, the temperature coefficient and the pressure coefficient are large, which affects the performance.
  • the vertical standard capacitor is used to fix the low voltage electrode and the shield assembly to the outer casing through 8 fixing parts.
  • the installation structure because the machining accuracy of the barrel wall is difficult to control, and the installation is complicated at the same time, human error is introduced during the installation process, and it is difficult to ensure the coaxiality of the high and low voltage electrodes.
  • both the inflation and the temperature rise cause deformation of the cylinder wall, which causes the low-voltage electrode and the shield assembly to cause a change in capacitance, resulting in unstable capacitor performance. Therefore, it is necessary to design a new structure that is easy to install and effectively avoids the above problems.
  • the present invention proposes a standard capacitor mounted using a split coaxial structure to solve the above problems. Summary of the invention
  • the object of the present invention is to provide a standard coaxial capacitor mounted standard capacitor for the existing standard capacitor installation and structural deficiencies, and the device relies on mechanical finishing to control the coaxiality of components.
  • the coaxiality of the high voltage electrode and the low voltage electrode is improved, and the stability of the standard capacitor capacitance is ensured.
  • the technical solution adopted by the invention is: a standard capacitor installed in a split coaxial structure, which is a vertical structure in which a high-voltage electrode, a low-voltage electrode and a shield assembly are aligned by a central axis, and a split-type coaxial installation is performed.
  • the utility model is characterized in that: the bottom plate, the shell assembly, the electrode assembly, the high voltage sleeve, the conductive rod and the equalizing ring, the electrode assembly comprises an electrode fixing platform, a post insulator, a high voltage electrode, a low voltage electrode and a shielding assembly, the shell
  • the body assembly and the electrode fixing platform are installed at a center of the bottom plate
  • the low voltage electrode and the shielding assembly are fixed on the electrode fixing platform flange
  • the post insulator is installed at a center of the bottom plate of the electrode fixing platform.
  • the high voltage electrode is mounted at the center of the post insulator, which is mounted at the center of the housing assembly.
  • the standard coaxial capacitor mounted standard capacitor as described above is characterized in that: the housing assembly and the electrode assembly are installed in a split manner, and the two installations do not interfere with each other, and the electrode assembly is completely enclosed.
  • the standard coaxial capacitor mounted standard capacitor as described above is characterized in that: the electrode fixing platform bottom plate is centered and finished to machine a circular groove, and the post insulator is fixedly mounted in the groove to ensure the post insulator and the electrode.
  • the coaxiality of the fixed platform; the positioning hole on the flange of the electrode fixing platform ensures the coaxiality of the assembly of the low-voltage electrode and the shielding assembly with the electrode fixing platform.
  • the standard coaxial capacitor mounted standard capacitor as described above is characterized in that: the upper end surface of the post insulator has a projection which is assembled with the center hole of the high voltage electrode fixing mounting plate to ensure the coaxiality of the high voltage electrode mounting.
  • the invention has the beneficial effects that: the invention utilizes a split structure to separate the low-voltage electrode and the shielding assembly from the cylinder wall, thereby avoiding the change of the capacitance due to the deformation of the cylinder wall, lowering the temperature coefficient and the pressure coefficient, and installing the platform at the same time.
  • the upper parts are positioned by the central axis, which can effectively ensure the coaxiality of the high and low voltage electrode assembly and reduce the voltage coefficient.
  • the low-voltage electrode and the shielding component are mounted on the electrode fixing platform, and the installation is simple and easy, and the installation error caused by the electrode fixing component can be reduced, the installation precision is improved, and the coaxiality is ensured.
  • DRAWINGS BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing the overall structure of a standard capacitor mounted using a split coaxial structure according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing an electrode assembly and an electrode mounting platform of a standard capacitor of the present invention. detailed description
  • the markings in the figure indicate: 1 a bottom plate, 2 - electrode fixed platform, 3 - housing assembly, 4 high voltage bushing, 5 - equalizing ring, 6 - post insulator, 7 - low voltage electrode and shielding assembly, 8 - high voltage Electrode, 9-conductive rod, 10-electrode fixed platform bottom plate, 11-electrode fixed platform flange, 12-shield, 13-low voltage electrode, 14-insulation, 15-spring contact seat.
  • Figure 1 is an overall structural view of the present invention, and is a standard capacitor mounted in a split coaxial structure.
  • the device comprises a bottom plate 1, an electrode assembly (including an electrode fixing platform 2, a post insulator 6, a high voltage electrode 8, a low voltage electrode and a shielding assembly 7), a housing assembly 3, a high voltage bushing 4, a conductive rod 9 and a pressure equalizing ring 5 .
  • the housing assembly 3 and the electrode fixing platform 2 are mounted at the center of the bottom plate 1 by the principle of alignment of the central axis, the post insulator 6 is mounted at the center of the electrode fixing platform bottom plate 10, and the high voltage electrode 8 is mounted at the center of the post insulator 6, the low voltage electrode
  • the shield assembly 7 is mounted at the center of the electrode fixing platform 2, and the high voltage bushing 4 is mounted at the center of the housing assembly 3.
  • the housing assembly 3 and the electrode assembly are mounted in a split manner, and the two components are not interfered with each other, and the electrode assembly is completely enclosed in a gas chamber insulated by SF6 gas. Install all sub-assemblies separately, and then securely mount them with the bottom plate coaxially aligned.
  • the low voltage electrode and shield assembly 7 is attached to the electrode mounting platform flange 11.
  • the lower end of the post insulator 6 for supporting the high voltage electrode is fixed to the bottom plate 10 of the electrode fixing platform, and the upper end is fixed to the middle horizontal plate of the high voltage electrode 8.
  • the electrode fixing platform bottom plate 10 is centered and finished to machine a circular groove, and the post insulator 6 is fixedly mounted in the groove to ensure the post insulator 6 and the electrode fixing platform. 2 coaxiality. After the electrode fixing platform is welded, it is positioned by the central axis of the barrel body. The positioning hole on the electrode fixing platform flange 11 ensures the positional accuracy of the positioning hole, thereby improving the coaxiality of the low-voltage electrode and the shielding assembly 7 and the electrode fixing platform 2.
  • the low voltage electrode 13 is coaxially mounted on the shield member 12 via the insulating member 14, and the entire low voltage electrode and the shield member are mounted on the positioning holes of the electrode fixing platform flange 11.
  • the high voltage electrode 8 is fixed to the bottom plate of the electrode fixing platform 2 by a post insulator 6.
  • the upper end surface of the post insulator 6 has a projection which is assembled with the center hole of the high-voltage electrode 8 fixed mounting plate to ensure the coaxiality of the mounting of the high-voltage electrode 8.
  • each component is a coaxial structure, the central axis alignment can improve the controllability of assembly accuracy.
  • the low voltage electrode and the shield assembly are completely enclosed within the housing assembly 3 and have no direct assembly relationship with the housing assembly 3.
  • the capacitance is guaranteed to be unaffected by changes in gas pressure, ie the theoretical pressure coefficient is zero.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Abstract

本发明提供一种分体式同轴结构安装的标准电容器，其特征在于：由底板、壳体组件、电极组件、高压套管、导电杆及均压环组成，电极组件包括电极固定平台、支柱绝缘子、高压电极、低压电极及屏蔽组件，壳体组件与电极固定平台安装在底板的中心，低压电极及屏蔽组件固定在电极固定平台法兰上，支柱绝缘子安装在电极固定平台底板的中心，高压电极安装在支柱绝缘子中心，高压套管安装在壳体组件的中心。本发明利用分体式结构，将低压电极及屏蔽组件与筒壁分离，避免了由于筒壁的形变引起电容量的变化，降低温度系数和压力系数，同时安装平台上各部件均以中心轴定位加工，可有效保证高低压电极装配的同轴度，降低电压系数。

Description

一种采用分体式同轴结构安装的标准电容器 技术领域
本发明涉及一种采用分体式同轴结构安装的标准电容器，属于电力试验设备 技术领域， 特别适用于试验室及现场试验的高电压精密测量领域。 背景技术
标准电容器可用于高电压设备测试与检定工作，是高压实验室中必备的一种 标准设备。 目前标准电容器整体结构多为倒立式结构， 即高低压电极处于整台装 置上端， 该种标准电容器结构简单， 设计易实现。 但由于装置顶部电压集中，绝 缘筒外场强畸变严重，场强分布较难调整，致使很多高压电容器不得不降压工作。 而相应的正立式 （即高低压电极处于装置下端） 标准电容器恰恰解决了该问题， 由于正立式标准电容器可将高低压电极置于底部封闭金属壳体内，很好地解决了 由于场强畸变弓 I起的外绝缘问题。
但正立式结构中， 高低压电极、屏蔽组件结构及其安装固定较为复杂， 高低 压电极同轴度难以保证， 致使电容器相应参数如电压系数、温度系数、压力系数 较大， 影响其性能。 如在中国知网检索到的优秀硕士论文 《1200kV特高压正立 式标准电容器的研制》 中正立式标准电容器， 是将低压电极及屏蔽组件通过 8 根固定部件固定在外部壳体上， 该种安装结构， 由于筒壁的加工精度难以控制， 同时安装复杂， 安装过程中会引入人为误差， 很难保证高低压电极的同轴度。另 外， 充气和温升均会引起筒壁的形变， 会带动低压电极和屏蔽组件引起电容量的 变化， 致使电容器性能不稳定。 因此设计一种既方便安装， 又有效避免上述问题 的新结构十分必要。
有鉴于此，本发明提出一种采用分体式同轴结构安装的标准电容器， 以解决 上述问题。 发明内容
本发明的目的是：针对现有标准电容器安装及结构上的不足，提供一种分体 式同轴结构安装的标准电容器， 该装置依靠机械精加工控制零部件的同轴度，从 而提高了高压电极与低压电极安装的同轴度， 保证标准电容器电容量的稳定性。 本发明所采用的技术方案是： 一种分体式同轴结构安装的标准电容器， 是将 高压电极、低压电极及屏蔽组件采用中心轴对齐的原理， 进行分体式同轴安装的 正立式结构， 其特征在于： 由底板、 壳体组件、 电极组件、 高压套管、 导电杆及 均压环组成， 所述电极组件包括电极固定平台、 支柱绝缘子、 高压电极、 低压电 极及屏蔽组件，所述壳体组件与所述电极固定平台安装在所述底板的中心，所述 低压电极及屏蔽组件固定在所述电极固定平台法兰上，所述支柱绝缘子安装在所 述电极固定平台底板的中心，所述高压电极安装在支柱绝缘子中心，所述高压套 管安装在壳体组件的中心。
如上所述的分体式同轴结构安装的标准电容器，其特征在于： 所述壳体组件 与所述电极组件采用分体式安装， 两者安装互不干扰， 电极组件完全封闭在以
SF6气体绝缘的气室内。
如上所述的分体式同轴结构安装的标准电容器，其特征在于： 所述电极固定 平台底板以中心定位精加工一个圆形凹槽，支柱绝缘子固定安装在凹槽内，保证 了支柱绝缘子与电极固定平台的同轴度； 电极固定平台法兰上的定位孔，保证低 压电极及屏蔽组件与电极固定平台装配的同轴度。
如上所述的分体式同轴结构安装的标准电容器，其特征在于： 支柱绝缘子的 上端面有一凸起， 与高压电极固定安装板上的中心孔装配， 保证了高压电极安装 的同轴性。
本发明的有益效果是： 本发明利用一种分体式结构， 将低压电极及屏蔽组件 与筒壁分离，避免了由于筒壁的形变引起电容量的变化， 降低温度系数和压力系 数， 同时安装平台上各部件均以中心轴定位加工， 可有效保证高低压电极装配的 同轴度， 降低电压系数。与国内现有的正立式结构相比， 低压电极及屏蔽组件安 装在电极固定平台上，安装简单易行，同时可减小电极固定部件引起的安装误差， 提高安装精度， 保证了同轴度； 并且， 由于电极组件与壳体采用分体式安装，电 极不受壳体形变影响，保证了电容量不受气体压力变化的影响， 即理论压力系数 为 0。 附图说明 图 1是本发明实施例的采用分体式同轴结构安装的标准电容器的整体结构剖面 图。
图 2是本发明的标准电容器的电极组件及电极安装平台剖面图。 具体实施方式
为了更好地理解本发明， 下面结合实施例进一步阐明本发明的内容，但本发 明的内容不仅仅局限于下面的实施例。本领域技术人员可以对本发明作各种改动 或修改， 这些等价形式同样在本申请所列权利要求书限定范围之内。
图中的标记说明： 1一底板， 2—电极固定平台， 3—壳体组件， 4一高压套管， 5—均压环， 6—支柱绝缘子， 7—低压电极及屏蔽组件， 8—高压电极， 9一导电 杆， 10—电极固定平台底板， 11一电极固定平台法兰， 12—屏蔽件， 13—低压电 极， 14一绝缘件， 15—弹簧触指座。
图 1是本发明的整体结构图， 本发明是一种分体式同轴结构安装的标准电容 器。 该装置由底板 1、 电极组件 （包括电极固定平台 2、 支柱绝缘子 6、 高压电 极 8、 低压电极及屏蔽组件 7)、 壳体组件 3、 高压套管 4、 导电杆 9及均压环 5 组成。 以中心轴对齐的原理， 将壳体组件 3与电极固定平台 2安装在底板 1的中 心， 支柱绝缘子 6安装在电极固定平台底板 10的中心， 高压电极 8安装在支柱 绝缘子 6的中心，低压电极与屏蔽组件 7安装在电极固定平台 2的中心， 高压套 管 4安装在壳体组件 3的中心。这种以中心轴对齐， 层层叠加的分体式同轴结构 保证了安装精度， 提高了电容量的稳定性。
壳体组件 3与电极组件采用分体式安装， 两者安装互不干扰， 电极组件完全 封闭在以 SF6气体绝缘的气室内。 先将所有子组件分体安装， 再以底板同轴对 齐的方式固定安装。 低压电极及屏蔽组件 7固定在电极固定平台法兰 11上。 用 于支撑高压电极的支柱绝缘子 6下端固定于电极固定平台底板 10上， 上端固定 在高压电极 8中间横板上，安装时将壳体组件 3与固定电极组件的底板 1固定即 完成安装。
图 2是本发明的电极组件及电极安装平台剖面图，电极固定平台底板 10以中 心定位精加工一个圆形凹槽，支柱绝缘子 6固定安装在凹槽内，保证了支柱绝缘 子 6与电极固定平台 2的同轴度。电极固定平台焊接完毕后，以桶体中心轴定位， 加工电极固定平台法兰 11上的定位孔， 保证了定位孔的位置精度， 从而提高了 低压电极及屏蔽组件 7与电极固定平台 2装配的同轴度。
低压电极 13通过绝缘件 14同轴安装在屏蔽件 12上，整个低压电极及屏蔽组 件安装在电极固定平台法兰 11的定位孔上。 高压电极 8用一根支柱绝缘子 6固 定在电极固定平台 2的底板上。 支柱绝缘子 6的上端面有一凸起， 与高压电极 8 固定安装板上的中心孔装配， 保证了高压电极 8安装的同轴性。
由于各组件均为同轴结构，采用中心轴对齐的方式可提高了装配精度的可控 性。另外低压电极及屏蔽组件完全封闭在壳体组件 3内， 与壳体组件 3没有直接 的装配关系。 保证了电容量不受气体压力变化的影响， 即理论压力系数为 0。 本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。

Claims

权 利 要 求 书
1、 一种分体式同轴结构安装的标准电容器， 是将高压电极、 低压电极及屏 蔽组件采用中心轴对齐的原理，进行分体式同轴安装的正立式结构，其特征在于: 由底板、 壳体组件、 电极组件、 高压套管、 导电杆及均压环组成， 所述电极组件 包括电极固定平台、 支柱绝缘子、 高压电极、 低压电极及屏蔽组件， 所述壳体组 件与所述电极固定平台安装在所述底板的中心，所述低压电极及屏蔽组件固定在 所述电极固定平台法兰上， 所述支柱绝缘子安装在所述电极固定平台底板的中 心，所述高压电极安装在支柱绝缘子中心，所述高压套管安装在壳体组件的中心。
2、根据权利要求 1所述的分体式同轴结构安装的标准电容器，其特征在于: 所述壳体组件与所述电极组件采用分体式安装，两者安装互不干扰， 电极组件完 全封闭在以 SF6气体绝缘的气室内。
3、根据权利要求 1所述的分体式同轴结构安装的标准电容器，其特征在于: 所述电极固定平台底板以中心定位精加工一个圆形凹槽，支柱绝缘子固定安装在 凹槽内，保证了支柱绝缘子与电极固定平台的同轴度； 电极固定平台法兰上的定 位孔， 保证低压电极及屏蔽组件与电极固定平台装配的同轴度。
4、 根据权利要求 1所述的分体式同轴结构安装的标准电容器， 其特征在于： 支柱绝缘子的上端面有一凸起， 与高压电极固定安装板上的中心孔装配，保证了 高压电极安装的同轴性。
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