WO2020119270A1 - 电容装置及其制造方法和电容式电压互感器 - Google Patents

电容装置及其制造方法和电容式电压互感器 Download PDF

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Publication number
WO2020119270A1
WO2020119270A1 PCT/CN2019/112942 CN2019112942W WO2020119270A1 WO 2020119270 A1 WO2020119270 A1 WO 2020119270A1 CN 2019112942 W CN2019112942 W CN 2019112942W WO 2020119270 A1 WO2020119270 A1 WO 2020119270A1
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expander
capacitor device
manufacturing
cover plate
hole
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PCT/CN2019/112942
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English (en)
French (fr)
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赵含
信建伟
王凤婷
赵莹
杨晓静
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西安西电电力电容器有限责任公司
中国西电电气股份有限公司
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Publication of WO2020119270A1 publication Critical patent/WO2020119270A1/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
    • H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
    • H01G13/003—Apparatus or processes for encapsulating capacitors

Definitions

  • the invention relates to the technical field of high-voltage electric power, in particular to a capacitor device and a method for manufacturing the same, and a capacitive voltage transformer provided with the capacitor device.
  • CVT Capacitance type voltage transformer
  • CVT Capacitance type voltage transformer
  • the CVT includes two parts: a capacitor device and an electromagnetic device.
  • the main structure of the capacitor device includes a barrel-shaped casing and a cover plate, as well as a capacitor core, insulating oil, and an expander provided in the barrel-shaped casing.
  • the expander is generally an elastic sealing element. When the volume of the insulating oil in the capacitor device changes due to temperature changes, the expander can play a role in pressure compensation. According to the different positions of the expander in the barrel casing, it is divided into an internal expander and an external expander. The internal expander is in a slightly expanded state when installed in the capacitor device to ensure that the internal pressure of the capacitor device is a slightly positive pressure.
  • Vacuum treatment is a drying process.
  • the pressure inside the device is lower than atmospheric pressure to achieve the purpose of dehydration and exhaust.
  • the expander is installed in the capacitor device in advance, the built-in expander is likely to burst due to the strong pressure difference; if the expander is installed after the vacuum process, it is necessary to vacuum After processing, the cover plate of the capacitor device is disassembled, the expander is installed, the cover plate and the barrel-shaped housing are assembled, and the manufacturing process is cumbersome.
  • the object of the present invention is to provide a capacitor device and a method for manufacturing the same, and a capacitive voltage transformer provided with the capacitor device.
  • an expander may be installed first, and then disposable Complete vacuum, oil injection, pressure and other technological processes, less processing procedures, and not easy to damage the expander.
  • the present invention provides the following technical solutions:
  • a method for manufacturing a capacitor device includes the following steps:
  • a closed space is formed by the inner wall of the barrel-shaped shell, the inner wall of the cover plate and the outer wall of the expander, wherein the cover plate covers the opening at the top end of the barrel-shaped shell, and the expander is provided in the barrel-shaped shell Inside the housing and connected to the cover plate, and the expander is provided with a first through hole for connecting the internal space of the expander to the outside of the device, at this time: the expander is a closing element and is located Naturally without expansion and contraction, the internal air pressure is atmospheric pressure; or, the expander is in a contracted state, and its internal air is partially discharged or completely discharged through the first through hole to close the first through hole to form a closing element;
  • the expander is provided with a first through hole for connecting the internal space of the expander to the outside of the device, and the first through hole connects the The expander closure constitutes the closure element.
  • the expander includes an elastic body and an assembly table, one end of the assembly table is connected to the top end of the expander, and the other end is connected to the cover plate, and, the The assembly table is provided with the first through hole for connecting the internal space of the elastic body to the outside of the device.
  • the assembly table and the cover plate are screwed together.
  • the cover plate is provided with a second through hole communicating with the enclosed space for vacuuming and oiling into the enclosed space, the second The through hole closes the closed space through the second plug.
  • the barrel-shaped housing includes a bottom and a sleeve, and the sleeve is a porcelain sleeve or a composite silicone rubber sleeve.
  • the expander is a bellows type expander.
  • a capacitor device is manufactured by the above capacitor device manufacturing method.
  • a capacitive voltage transformer The capacitive device in the capacitive voltage transformer is the capacitive device as described above.
  • the capacitor device includes an expander.
  • the expander Before the vacuum treatment of the capacitor device, the expander is in a natural non-stretching state (or a contracted state closed after the gas is discharged); during the vacuum process, the gas in the enclosed space composed of the barrel-shaped casing, the cover plate and the expander It is drawn out and exhibits negative pressure, which causes the expander to expand.
  • the final expansion elongation is small, which can avoid excessive expansion and bursting. Damage;
  • the expander is provided with a first through hole, so that the inside of the housing can be slightly positively pressurized by air, without having to repeatedly disassemble and assemble the capacitor device.
  • the expander can be installed in the barrel-shaped housing in advance, and then the vacuum, oil injection, and pressure processing processes are completed at one time. In the process, it is not necessary to disassemble the capacitor device or remove the expander. There are fewer processing procedures and lower processing costs.
  • FIG. 1 is a schematic diagram of an assembly structure of a barrel-shaped casing, a cover plate and an expander in a capacitor device provided by an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a state structure of a capacitor device according to an embodiment of the present invention during vacuum processing
  • FIG. 3 is a schematic diagram of a state structure of a capacitor device according to an embodiment of the present invention during an oil injection process
  • FIG. 4 is a schematic diagram of a state structure of a capacitor device according to an embodiment of the present invention during a pressing process.
  • the invention discloses a capacitor device and its manufacturing process, and a capacitor voltage transformer provided with the capacitor device.
  • an expander In the manufacturing process of the capacitor device, an expander can be installed first, and then vacuuming, oil injection, etc. There are few processing procedures such as pressing and other process treatments, and it is not easy to damage the expander.
  • FIG. 1 is a schematic diagram of an assembly structure of a barrel casing, a cover plate and an expander in a capacitor device according to an embodiment of the present invention
  • FIG. 2 is a vacuum processing of the capacitor device according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of the state structure of the capacitor device provided in the embodiment of the present invention during the oil injection process
  • FIG. 4 is a schematic diagram of the state structure of the capacitor device provided in the embodiment of the present invention during the suppression process.
  • the first embodiment of the present invention provides a manufacturing process of a capacitive device, which can be used in a capacitive voltage transformer.
  • the manufacturing process of the capacitor device includes the following steps:
  • the expander 2 is a closed element, and is in a natural state without expansion and contraction, and its internal air pressure is atmospheric pressure;
  • Vacuuming the above enclosed space (the purpose is to dehydrate and dry).
  • the expander 2 expands, where "vacuuming” specifically refers to, 1 extracting a predetermined amount of gas to make the enclosed space There is a negative pressure in the interior (that is, the volume of the extracted gas is not less than 0.5 liters), or 2 after the gas in the enclosed space is extracted to reach the preset negative pressure value (that is, the pressure value in the enclosed space is not high after treatment) At 10kPa), or 3 when the gas in the enclosed space is evacuated, the staff will automatically control when to end the evacuation according to the actual situation;
  • the expander 2 Before vacuum treatment, the expander 2 has a flat structure under normal atmospheric pressure and naturally unstretched state, with no expansion or slight expansion. At this time, the length of the expander 2 is H1, see FIG. 1;
  • the expander 2 expands and stretches due to external negative pressure. At this time, the maximum stretching length of the expander 2 is H2, see FIG. 2;
  • the length of the expander 2 is H3, see FIG. 3;
  • the capacitor device has an expander 2 built-in.
  • the expander 2 Before the vacuum treatment, the expander 2 is in a natural non-stretching state (or a contracted state closed after the gas is discharged); during the vacuum treatment, the enclosed space formed by the barrel-shaped housing 1, the cover plate 3, and the expander 2 The gas is drawn out and assumes a negative pressure, which causes the expander 2 to expand.
  • the final expansion elongation is small, which can avoid its expansion due to expansion. Excessive and rupture damage;
  • the expander 2 is provided with a first through hole 4, so that the inside of the housing 1 can be in a slightly positive pressure state by inflating, without having to repeatedly disassemble and assemble the capacitor device.
  • the expander 2 can be installed in the barrel-shaped housing 1 in advance, and then the process processes of vacuuming, oil injection, and pressing are completed at one time, without disassembling the capacitor device or removing the expansion during the process
  • the device 2 has fewer processing steps and lower processing cost.
  • the present invention also provides a second embodiment.
  • the second embodiment provides a manufacturing process of a capacitive device, which can be used in a capacitive voltage transformer. Only step 1) in the manufacturing process of the capacitor device is different from step 1) in the first embodiment. Other steps, working principles and beneficial effects are the same as those in the first embodiment, and will not be repeated here.
  • Step 1) of the manufacturing process of the capacitor device provided by the second embodiment of the present invention is specifically as follows:
  • the expander 2 is a closing element, because its internal gas is partially discharged or completely discharged through the first through hole 4 and then closes the first through hole 4, thereby being in a contracted state.
  • the expander 2 is provided with a first through hole 4 for connecting the internal space of the expander 2 to the outside of the device.
  • the expander 2 is also provided with The first plug 6 adapted to the hole 4, when the first plug 6 is separated from the first through hole 4, the internal space of the expander 2 communicates with the outside of the device (ie atmospheric pressure or other external air pressure), the first plug 6 closes the first Through hole 4 the expander 2 is a closing element.
  • the cover plate 3 is provided with a second through hole 5 communicating with the above-mentioned closed space for vacuuming and oil injection into the closed space, and the cover plate 3 is also equipped with a second through hole 5 adapted When the second plug 7 is separated from the second through hole 5, the above-mentioned closed space formed by the inner wall of the barrel-shaped casing 1, the inner wall of the cover plate 3 and the outer wall of the expander 2 is not closed, the second When the plug 7 closes the second through hole 5, the closed space is closed.
  • the barrel-shaped housing 1 is generally composed of a bottom plate 11 and a sleeve 12.
  • the sleeve 12 is preferably a porcelain sleeve or a composite silicone rubber sleeve; the expander 2
  • the bellows type expander can be used. However, it is not limited to this, and those skilled in the art may implement it according to actual needs.
  • the first through hole 4 provided on the expander 2 is located at the connection between the cover plate 3 and the expander 2.
  • the expander 2 includes an elastic body 21 and an assembly table 22.
  • One end of the assembly table 22 is connected to the top end of the elastic body 21, and the other end is connected to the cover plate 3 (preferably screw connection), and the first through hole 4 is provided on the assembly table 22.
  • the third embodiment of the present invention provides a capacitor device, which can be used in a capacitive voltage transformer.
  • the capacitor device is a capacitor device manufactured through the above-described capacitor device manufacturing process.
  • the fourth embodiment of the present invention also provides a capacitive voltage transformer.
  • the capacitive device in the capacitive voltage transformer is the capacitive device as described above.

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

Abstract

一种电容装置及其制造方法，以及一种设置有该电容装置的电容式电压互感器。该电容装置制造方法为：由桶型壳体（1）的内壁、盖板（3）的内壁和膨胀器（2）的外壁构成封闭空间，其中，盖板（3）覆盖在桶型壳体（1）的顶端开口处，膨胀器（2）设置有第一通孔（4）且设置在桶型壳体（1）内与盖板（3）连接，此时，膨胀器（2）为封闭元件，且处于自然无伸缩状态，或处于挤出部分气体或全部气体后的收缩状态；对封闭空间做抽真空处理；向封闭空间内注油后封闭该封闭空间；向膨胀器（2）内打气，以令上述封闭空间中的压力达到预设正压力值，然后封闭膨胀器（2）构成封闭元件。该电容装置制造过程中，可先安装膨胀器（2），然后一次性完成抽真空、注油、打压等工艺处理过程，加工工序较少，不易损坏膨胀器（2）。

Description

电容装置及其制造方法和电容式电压互感器 技术领域
本发明涉及高压电力技术领域，特别涉及一种电容装置及其制造方法和一种设置有该电容装置的电容式电压互感器。
背景技术
CVT(Capacitance type voltage transformer，电容式电压互感器)因其良好的绝缘性能和较高的稳定可靠性被广泛使用。例如，在高压电力系统中，由于系统控制、继电保护、测量等需要，会在系统中大量使用高压CVT。
CVT包括电容装置和电磁装置两大部分，电容装置主要结构包括桶型壳体和盖板，以及设置在桶型壳体内的电容心子、绝缘油和膨胀器。膨胀器一般为弹性封闭元件，当电容装置内的绝缘油因温度变化而发生体积变化时，膨胀器可起到压力补偿的作用。根据膨胀器在桶型壳体内的不同位置，分为内置式膨胀器和外置式膨胀器，内置式膨胀器安装到电容装置内时为微膨胀状态，以保证电容装置内部压力为微正压。
在CVT生产过程中，电容装置往往需要做抽真空处理。抽真空处理是一种干燥工艺，处理过程中，装置内部的压力低于大气压力，以达到脱水排气的目的。
在电容装置抽真空处理过程中，若预先将膨胀器安装在电容装置内，则由于强大的压力差容易导致内置式膨胀器炸裂；若抽真空处理之后，再安装膨胀器，则需要在抽真空处理后拆开电容装置的盖板、安装膨胀器、组装盖板和桶型壳体，其制造过程繁琐。
因此，如何对设置有内置式膨胀器的电容装置进行抽真空处理以及如何安装膨胀器，是本领域技术人员亟待解决的技术问题。
发明内容
有鉴于此，本发明的目的在于提供一种电容装置及其制造方法，以及一种设置有该电容装置的电容式电压互感器，在电容装置制造过程中，可先安装膨胀器，然后一次性完成抽真空、注油、打压等工艺处理过程，加工工序较少，且不易损坏膨胀器。
为实现上述目的，本发明提供如下技术方案：
一种电容装置制造方法，包括如下步骤：
由桶型壳体的内壁、盖板的内壁和膨胀器的外壁构成封闭空间，其中，所述盖板覆盖在所述桶型壳体的顶端开口处，所述膨胀器设置在所述桶型壳体内且与所述盖板连接，并且，所述膨胀器上设置有用于将所述膨胀器的内部空间连通装置外部的第一通孔，此时：所述膨胀器为封闭元件，且处于自然无伸缩状态，其内部气压为大气压；或者，所述膨胀器处于收缩状态，其内部气体通过所述第一通孔被部分排出或全部排出后封闭所述第一通孔，构成封闭元件；
对所述封闭空间做抽真空处理；
向所述封闭空间内注油后封闭所述封闭空间；
向所述膨胀器内打气，以令所述封闭空间中的压力达到预设正压力值，然后封闭所述膨胀器构成封闭元件。
优选地，在上述电容装置制造方法中，所述膨胀器上设置有用于将所述膨胀器的内部空间连通装置外部的第一通孔，所述第一通孔通过第一堵头将所述膨胀器封闭构成所述封闭元件。
优选地，在上述电容装置制造方法中，所述膨胀器包括弹性体和装配台，所述装配台的一端与所述膨胀器的顶端连接，另一端与所述盖板连接，并且，所述装配台上设置有用于将所述弹性体的内部空间连通装置外部的所述第一通孔。
优选地，在上述电容装置制造方法中，所述装配台与所述盖板之间螺纹连接。
优选地，在上述电容装置制造方法中，所述盖板上设置有与所述封闭空间连通的第二通孔，用于向所述封闭空间内做抽真空处理和注油处理，所述第二通孔通过第二堵头将所述封闭空间进行封闭。
优选地，在上述电容装置制造方法中，所述桶型壳体包括底部和套筒，所述套筒为瓷套或复合硅橡胶套管。
优选地，在上述电容装置制造方法中，所述膨胀器为波纹管式膨胀器。
一种电容装置，所述电容装置为通过上述电容装置制造方法制造而成的电容装置。
一种电容式电压互感器，所述电容式电压互感器中的电容装置为如上文中所述的电容装置。
从上述技术方案可以看出，本发明提供的电容装置及其制造方法以及设置有该电容装置的电容式电压互感器中，电容装置内置膨胀器。该电容装置在做真空处理前，膨胀器处于自然无伸缩状态(或排出气体后封闭的收缩状态)；真空处理过程中，由桶型壳体、盖板和膨胀器构成的封闭空间内的气体被抽出而呈现负压，导致膨胀器发 生膨胀，但是，相对于现有技术中初始状态为膨胀状态的膨胀器而言，其最终达到的膨胀伸长量较小，能够避免其膨胀过量而炸裂损坏；此外，由于膨胀器上设置有第一通孔，从而能够通过打气的方式令壳体内呈微正压状态，不必对电容装置进行重复拆装。
从而，该电容装置在制造过程中，可以提前将膨胀器安装在桶型壳体内，然后一次完成抽真空、注油、打压等工艺处理过程，过程中不用拆开电容装置或拆下膨胀器，其加工工序较少，加工成本较低。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的电容装置中的桶型壳体、盖板和膨胀器的组装结构示意图；
图2为本发明实施例提供的电容装置在真空处理过程中的状态结构示意图；
图3为本发明实施例提供的电容装置在注油处理过程中的状态结构示意图；
图4为本发明实施例提供的电容装置在打压处理过程中的状态结构示意图。
具体实施方式
本发明公开了一种电容装置及其制造过程，以及一种设置有该电容装置的电容式电压互感器，在电容装置制造过程中，可先安装膨胀器，然后一次性完成抽真空、注油、打压等工艺处理过程，加工工序较少，且不易损坏膨胀器。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图1至图4，图1为本发明实施例提供的电容装置中的桶型壳体、盖板和膨胀器的组装结构示意图，图2为本发明实施例提供的电容装置在真空处理过程中的状态结构示意图，图3为本发明实施例提供的电容装置在注油处理过程中的状态结构 示意图，图4为本发明实施例提供的电容装置在打压处理过程中的状态结构示意图。
本发明第一实施例提供了一种电容装置制造过程，该电容装置可用在电容式电压互感器中。该电容装置制造过程包括如下步骤：
1)组装桶型壳体1、盖板3和膨胀器2，其中，膨胀器2上设置有用于将膨胀器2的内部空间连通装置外部的第一通孔4，盖板3覆盖在桶型壳体1的顶端开口处，膨胀器2设置在桶型壳体1内且与盖板3连接，从而由桶型壳体1的内壁、盖板3的内壁和膨胀器2的外壁构成封闭空间，此时：膨胀器2为封闭元件，且处于自然无伸缩状态，其内部气压为大气压；
2)对上述封闭空间做抽真空处理(目的是脱水干燥)，处理过程中，膨胀器2发生膨胀，其中，“抽真空处理”具体是指，①抽出预设量的气体而令该封闭空间内呈负压状态(即被抽出的气体体积不少于0.5升)，或者②抽出该封闭空间内的气体后使其达到预设负压值(即处理后该封闭空间内达到压力值不高于10kPa)，或者③抽出该封闭空间内的气体时，由工作人员根据实际情况自行控制何时结束抽真空动作；
3)向上述封闭空间内注油(即绝缘油)，此时，膨胀器2由于自身弹力而收缩，完成注油之后，封闭该封闭空间；
4)向膨胀器2内打气，以令上述封闭空间中的压力达到预设正压力值(即电容装置内部初始压力为0.01Mpa～0.5Mpa之间)，一般为微正压状态)，然后封闭膨胀器2构成封闭元件。
其中：
真空处理前，膨胀器2在正常大气压和自然无伸缩状态下为扁平结构，无膨胀或微膨胀，此时膨胀器2的长度为H1，可参见图1；
真空处理时，膨胀器2由于外部负压而膨胀拉伸，此时膨胀器2的最大拉伸长度为H2，可参见图2；
对电容装置内部进行注油处理后，膨胀器2的长度为H3，可参见图3；
最后向膨胀器2内打气，调整膨胀器2的伸缩量，以调整电容装置内部压力达到0.01Mpa～0.5Mpa之间的微正压状态，调整后，膨胀器2的长度为H4，可参见图4。
其中，H1≤H3＜H4＜H2。
从上述技术方案可以看出，本发明第一实施例提供的电容装置制造过程中，电容装置内置膨胀器2。在做真空处理前，膨胀器2处于自然无伸缩状态(或排出气体后封闭的收缩状态)；真空处理过程中，由桶型壳体1、盖板3和膨胀器2构成的封闭 空间内的气体被抽出而呈现负压，导致膨胀器2发生膨胀，但是，相对于现有技术中初始状态为膨胀状态的膨胀器而言，其最终达到的膨胀伸长量较小，能够避免其由于膨胀过量而炸裂损坏；此外，由于膨胀器2上设置有第一通孔4，从而能够通过打气的方式令壳体1内呈微正压状态，不必对电容装置进行重复拆装。
从而，该电容装置在制造过程中，可以提前将膨胀器2安装在桶型壳体1内，然后一次完成抽真空、注油、打压等工艺处理过程，过程中不用拆开电容装置或拆下膨胀器2，其加工工序较少，加工成本较低。
此外，本发明还提供了第二实施例，第二实施例提供了一种电容装置制造过程，该电容装置可用在电容式电压互感器中。该电容装置制造过程中仅步骤1)与第一实施例中的步骤1)不同，其它步骤、工作原理以及有益效果同第一实施例，本文在此不再赘述。
本发明第二实施例提供的电容装置制造过程的步骤1)，具体为：
1)组装桶型壳体1、盖板3和膨胀器2，其中，膨胀器2上设置有用于将膨胀器2的内部空间连通装置外部的第一通孔4，盖板3覆盖在桶型壳体1的顶端开口处，膨胀器2设置在桶型壳体1内且与盖板3连接，从而由桶型壳体1的内壁、盖板3的内壁和膨胀器2的外壁构成封闭空间，此时：膨胀器2为封闭元件，因其内部气体通过第一通孔4被部分排出或全部排出后封闭第一通孔4，从而处于收缩状态。
具体地，如图1所示，在上述实施例中，膨胀器2上设置有用于将膨胀器2的内部空间连通装置外部的第一通孔4，膨胀器2上还配备有与第一通孔4适配的第一堵头6，第一堵头6与第一通孔4分离时膨胀器2的内部空间连通装置外部(即大气压或其它外气压)，第一堵头6封闭第一通孔4时膨胀器2为封闭元件。
并且，盖板3上设置有与上述封闭空间连通的第二通孔5，用于向封闭空间内做抽真空处理和注油处理，盖板3上还配备有与第二通孔5适配的第二堵头7，第二堵头7与第二通孔5分离时，由桶型壳体1的内壁、盖板3的内壁和膨胀器2的外壁构成的上述封闭空间不封闭，第二堵头7封闭第二通孔5时，该封闭空间封闭。
具体地，如图1所示，在上述实施例中，上述桶型壳体1一般由底板11和套筒12构成，该套筒12优选采用瓷套或复合硅橡胶套管；上述膨胀器2可选用波纹管式膨胀器。但并不局限于此，本领域技术人员可根据实际需要进行具体实施。
优选地，如图2所示，上述膨胀器2上设置的第一通孔4，位于盖板3和膨胀器2的连接处。具体地，膨胀器2包括弹性体21和装配台22。装配台22的一端与弹性 体21的顶端连接，另一端与盖板3连接(优选为螺纹连接)，第一通孔4设置在装配台22上。
综上，本发明第三实施例提供了一种电容装置，可用在电容式电压互感器中。该电容装置为通过上文中所述电容装置制造过程制造而成的电容装置。
此外，本发明第四实施例还提供了一种电容式电压互感器，该电容式电压互感器中的电容装置为如上文中所述的电容装置。
最后，还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (9)

  1. 一种电容装置制造方法，其特征在于，包括如下步骤：
    由桶型壳体(1)的内壁、盖板(3)的内壁和膨胀器(2)的外壁构成封闭空间，其中，所述盖板(3)覆盖在所述桶型壳体(1)的顶端开口处，所述膨胀器(2)设置在所述桶型壳体(1)内且与所述盖板(3)连接，并且，所述膨胀器(2)上设置有用于将所述膨胀器(2)的内部空间连通该电容装置外部且可封闭的第一通孔(4)，此时，所述膨胀器(2)为封闭元件，且处于自然无伸缩状态，其内部气压为大气压；或者，所述膨胀器(2)为处于收缩状态的封闭元件，因其内部气体通过所述第一通孔(4)被部分排出或全部排出后封闭所述第一通孔(4)；
    对所述封闭空间做抽真空处理；
    向所述封闭空间内注油后封闭所述封闭空间；
    向所述膨胀器(2)内打气，以令所述封闭空间中的压力达到0.01Mpa～0.5Mpa之间的预设正压力值，然后封闭所述膨胀器(2)构成封闭元件。
  2. 根据权利要求1所述的电容装置制造方法，其特征在于，所述第一通孔(4)通过第一堵头(6)将所述膨胀器(2)封闭构成所述封闭元件。
  3. 根据权利要求2所述的电容装置制造方法，其特征在于，所述膨胀器(2)包括弹性体(21)和装配台(22)，所述装配台(22)的一端与所述膨胀器(2)的顶端连接，另一端与所述盖板(3)连接，并且，所述装配台(22)上设置有用于将所述弹性体(21)的内部空间连通该电容装置外部的所述第一通孔(4)。
  4. 根据权利要求3所述的电容装置制造方法，其特征在于，所述装配台(22)与所述盖板(3)之间螺纹连接。
  5. 根据权利要求1所述的电容装置制造方法，其特征在于，所述盖板(3)上设置有与所述封闭空间连通的第二通孔(5)，用于向所述封闭空间内做抽真空处理和注油处理，所述第二通孔(5)通过第二堵头(7)将所述封闭空间进行封闭。
  6. 根据权利要求1至5任一项所述的电容装置制造方法，其特征在于，所述桶型壳体(1)包括底板(11)和套筒(12)，所述套筒(12)为瓷套或复合硅橡胶套管。
  7. 根据权利要求1至5任一项所述的电容装置制造方法，其特征在于，所述膨胀器(2)为波纹管式膨胀器。
  8. 一种电容装置，其特征在于，所述电容装置为通过上述权利要求1至7任一 项所述的电容装置制造方法制造而成的电容装置。
  9. 一种电容式电压互感器，其特征在于，所述电容式电压互感器中的电容装置为如权利要求8所述的电容装置。
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