JPH0610666Y2 - Gas insulation capacitor for three phases - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention is used in power facilities such as cubicles installed in places where disaster prevention measures are highly required, such as in buildings, underground malls and subways. A gas-insulated capacitor for phase use.

(B) Conventional technology In general, in gas-filled electrical equipment including this type of three-phase gas-insulated capacitor, the gas pressure of the insulating gas with which the gas is filled is high, which means that deformation of the container due to gas pressure is prevented. In most cases, a cylindrical container is used.

In order to obtain a required rating when manufacturing a normal capacitor, a configuration is known in which round-wound capacitor elements are assembled into a substantially rectangular parallelepiped shape, and a plurality of series-connected capacitor elements are connected in series and parallel to form an assembly.

In a three-phase gas-insulated capacitor, round-wound capacitor elements are assembled according to the required rating to form a substantially cylindrical assembly, and each assembly is separated from each other by a predetermined insulation distance, and A configuration is known in which a cylindrical container is housed in a cylindrical container at a predetermined insulation distance from the inner wall, the container is hermetically sealed and degassed, and then an insulating gas is filled.

(C) Problems to be solved by the invention However, when used in power equipment such as cubicles, the installation space for the three-phase gas-insulated capacitor is often a square, and a cylindrical container is used for installation. So space efficiency was poor. This was especially noticeable for cubicles, which are usually narrow in depth. Also, when three-phase gas-insulated capacitors are installed in parallel and the wiring for each phase is performed in the shortest distance, the wiring distance used for wiring may not satisfy the insulation distance corresponding to the working voltage. It was necessary to devise.

This invention was made in consideration of the above circumstances,
An object of the present invention is to provide a three-phase gas-insulated capacitor capable of reducing the outer shape of the container and effectively utilizing the space at the installation location.

(D) Means and Actions for Solving the Problems Thus, according to the present invention, a round rod body made of an insulating material is formed into a plurality of round wound capacitor elements having a cylindrical outer shape and a hollow core portion. A capacitor element body formed by inserting and connecting each of the round-wound capacitor elements in series, and a capacitor element body assembly in which the capacitor element bodies are brought into close contact with each other to form a substantially rectangular parallelepiped shape and the respective capacitor element bodies are connected in parallel. And a container having the shape of a rectangular parallelepiped in which three of the capacitor body assemblies are housed, and the inner wall surface is located at a portion separated from the outer peripheral surface of each capacitor body assembly by a constant insulation distance, and the capacitor body. There is provided a three-phase gas-insulated capacitor comprising an insulating gas filled in a container accommodating the assembly under pressure.

Therefore, the capacitor body assembly is easily housed in a rectangular parallelepiped-shaped container with the outer shape of the container set to the minimum required size and with a certain insulating distance from the inner wall surface of the container. Further, since the container has a rectangular parallelepiped shape, the efficiency of occupying the installation space when installing is improved.

(E) Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiment.

FIG. 1 is a diagram showing a schematic configuration of a three-phase gas-insulated capacitor in an embodiment of the present invention.

In the figure. Reference numeral 1 denotes a round-wound capacitor element, which is a so-called soft-core type capacitor, which is obtained by, for example, winding a polyethylene terephthalate film a large number of times, and has a hollow portion which is substantially a winding core portion and which has a cavity, and is formed by metal vapor deposition of, for example, a polypropylene film Two films are superposed and wound many times to form a cylindrical shape, both ends of the obtained cylindrical body are treated with metallikon, and lead wires are soldered to the metallikon part.

Reference numeral 2 denotes a capacitor element body, in which a round bar body 3 made of an insulating material is wound in a flat packing made of an elastic material such as rubber (not shown) in each cavity of each of the five round wound capacitor elements 1. It is formed by inserting it between the capacitor elements 1 and tightening both ends of the round bar 3 with, for example, nuts. The respective round-wound capacitor elements 1 are connected in series with each other. In this embodiment, as shown in FIG. 2, four capacitor element bodies 2 for one phase are in close contact with each other and are assembled into a substantially rectangular parallelepiped shape to form a capacitor element body assembly 4. The respective capacitor element bodies 2 are connected in parallel, and the lower ends of the respective capacitor element bodies 4 are connected to each other as a neutral point in the case of star connection. Although not shown, each capacitor body assembly 4 may be connected and fixed at its upper and lower ends with a channel-shaped copper plate for shielding. If the copper plate at the lower end is used with the channel inner surface facing upward, when unnecessary zinc particles adhered to the outer surface of the capacitor element 1 during the metallicon process fall from the capacitor element 1, they function as a tray to prevent unnecessary zinc particles from scattering. To do.

Reference numeral 5 denotes a rectangular parallelepiped-shaped container, on the inner bottom surface of which an insulating member 6 for laying insulation for the neutral point side connection is laid, and on the upper surface of this insulating member 6, there are three phases, that is, three capacitor element body assemblies. The body 4 is fixedly stored. The inner dimension of the container 5 may be such that the inner wall surface 5a and the capacitor body assembly 4 are separated from each other by a certain insulating distance determined by the applied voltage. Bushings 7 are erected in a row in the width direction of the container 5 at the upper part of the container 5, and the upper ends of the capacitor element assembly 4 are respectively provided with the bushings 7.
It is connected to the. When the bushing 7 is erected in this manner, when two or more three-phase gas-insulated capacitors are connected in parallel, the bushings corresponding to each other of the three-phase gas-insulated capacitors are connected to each other. It is possible to connect in a straight line.

Then, each capacitor element assembly 4 is placed in the container 5.
Is stored and fixed and degassed, and then an insulating gas 8 made of SF ₆ , for example, is filled in under pressure.

In the above embodiment, the capacitor body assembly 4 for one phase
The relationship between the size of the container and the size of the container 5 will be described.

First, the capacitor body 2 has a capacitance of C ₁ μF, and 2
The one that becomes nKVA by being connected in parallel is used. Therefore, in this embodiment, since four capacitor bodies 2 are connected in parallel, the capacity is 2 × nKVA.

As shown in FIG. 3, assuming that the outer diameter of the capacitor element 1 constituting the capacitor body 2 is d ₁ , the distance between the inner wall surface 5a of the container 5 and the capacitor body assembly 4 and the interphase distance are 1. , The inner dimension of the depth x width of the container 5 is (21 + 2
d ₁ ) × (41 + 6d ₁ ).

On the other hand, as shown in FIG. 4, three capacitor element bodies 20 are closely attached to each other and connected in parallel to form two
Consider the case of manufacturing a × nKVA capacitor.
In this case, the capacitance of one capacitor body 20 is C ₂ μ
If it is F, then C ₂ = 4/3 · C ₁ (μF) must be (1-1). Therefore, the outer diameter of the capacitor element forming the capacitor body 20 also becomes large. When the outer diameter of the capacitor element and _{d 2, C 1 = k (} d 1/2) 2 ...... (1-2) C 2 = k (d 2/2) 2 ...... (1-3) where k is It becomes a constant. (1-2) equation, and substituting the (1-3) equation (1-1) ^{_{equation, k (d 2/2)}} 2 = (4/3) · k (d 1/2) 2 Therefore, compared with the outer diameter of the capacitor element 1 in the embodiment, It will be twice as big. Therefore, in this case, the inner dimension of the depth x width of the container that stores this is In comparison with the above embodiment, the depth is about 0.15d ₁ ,
The width is increased by about 0.9 d ₁ .

As is clear from the above, the inside dimension of the container can be reduced by forming the capacitor element assembly into a substantially rectangular parallelepiped.

(F) Effect of the Invention According to this invention, a three-phase gas-insulated capacitor capable of reducing the shape of the container can be obtained by making the shape of the capacitor element assembly into a substantially rectangular parallelepiped. Further, since the shape of the container is a rectangular parallelepiped, space utilization efficiency is improved when the container is installed in a rectangular installation place such as a cubicle.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing the internal structure of the embodiment of the present invention viewed from the side, FIG. 2 is a structural explanatory view showing the internal structure of the same from above, and FIG. FIG. 4 is a schematic diagram of a plane configuration for explaining, and FIG. 4 is a view corresponding to FIG. 3 of a comparative example. 1 ... Round winding capacitor element, 2 ... Capacitor body, 3 ... Round bar body, 4 ... Capacitor body assembly, 5 ... Container, 8 ... Insulating gas.

Claims (1)

[Scope of utility model registration request] 1. A round rod body made of an insulating material is inserted into a plurality of round winding capacitor elements each having a cylindrical outer shape and having a cavity in a winding core, and each round winding capacitor element is connected in series. A capacitor element body, a capacitor element body assembly in which the capacitor element bodies are assembled in a substantially rectangular parallelepiped shape in close contact with each other and the respective capacitor element bodies are connected in parallel, and three capacitor element body assemblies are housed, Further, a rectangular parallelepiped-shaped container having an inner wall surface located at a portion separated from the outer peripheral surface of each capacitor element assembly by a constant insulation distance, and a container containing the capacitor element assembly is filled under pressure. A three-phase gas-insulated capacitor comprising an insulating gas.