JPH0549144A - Vapor mist type gas-insulated electric device - Google Patents

Abstract

PURPOSE:To reduce the number of components, to enhance economy and to support a long conductor by shutting OFF fluid to be supported by liquid insulator solidified to the support, and forming a shut-off part for directly dropping to a bottom of a sealed vessel at the support. CONSTITUTION:An insulating support 4 has a runabout part 42A in which three supporting rods 42 extended from a supporting part 41 of a bus 3 to an inner wall of a sealed vessel 1 are once run about to the part 41 at the intermediate of the extension. The part 42A is formed as a shut-off part for shutting OFF fluid E composed of liquid insulator solidified on the surface of the support 4 without guiding directly to the inner wall of the vessel 1, and the insulator is dropped from the shut-off part directly to the bottom of the vessel 1 as denoted by D. Accordingly, even if vapor mistlike liquid insulator is solidified on the surface of the support 4, the solidified liquid droplet forms a fluid passage E to the part 42A, a passage leading to the inner wall of the vessel 1 is not formed, and an insulating breakdown strength can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vapor-mist type gas-insulated electric device preferably used for a gas-insulated bus bar constituting a main circuit for electric power.

[0002]

2. Description of the Related Art As a conventional device of this type, for example,
The one described in Japanese Utility Model Publication No. 2-3119 is known. Therefore, the vapor mist type gas insulated electrical equipment described in this publication will be described with reference to FIGS. In FIG. 10, 1 is a hermetic container for hermetically sealing an insulating gas, 2 is a vapor mist feeder for feeding a liquid insulator such as a vaporized mist-like halogenated hydrocarbon liquid into the hermetic container 1, and 3 is a hermetic container. Conductors (busbars) 4 constituting an electric device housed in 1 are insulating supports which support the busbars 3 and insulate the busbars 3 from the closed container 1. The insulating supports 4 are shown in FIG. As shown in the enlarged view, it has three support rods 32 extending radially from the support portion 31 of the bus bar 3. Further, 5 is a concentration measuring device for measuring the concentration of the vapor mist-like liquid insulator in the closed container 1. Furthermore,
The vapor mist feeder 2 is an atomizer including a tank 21 that stores a liquid insulator in a liquid state and a piezoelectric element that atomizes the liquid insulator contained in the tank 21 into a vapor mist state. 22 and a diffusing device 23 for diffusing the mist generated by the atomizer 22 into the closed container 1 as indicated by arrow A.

Further, in the vapor mist type gas-insulated electric equipment shown in FIG. 12, an insulating support 4 for supporting the bus bar 3 is formed in a disk shape, and the disk-shaped insulating support 4 defines an adjacent space. is doing. That is, in this vapor mist type gas-insulated electric device, the internal space of the long closed container 1 is divided into a plurality of disc-shaped insulating supports 4 and, as shown in FIG. It has a structure in which a plurality of are arranged in series. Therefore, in each space defined by the disk-shaped insulating support 4, the vapor mist feeding device 2
And the concentration measuring device 5 is individually arranged.

[0004]

However, as shown in FIG.
The conventional vapor-mist gas-insulated electrical equipment shown in FIG. 13 has the following problems.

That is, in the vapor mist type gas-insulated electric equipment shown in FIGS. 10 and 11, the vapor mist-like liquid insulator floating in the closed container 1 is condensed on the surface of the insulating support 4 to generate droplets. Then, the droplets form a liquid flow path indicated by E in FIG. 11 along the radial support rod of the insulating support 4 and reach the inner wall of the closed container 1, and further along the inner wall, the closed container 1 Stays at the bottom of the. When impurities are mixed in the liquid insulator flowing in the flow path, the impurities stay in the flow path of the support rod in a band shape and the dielectric strength is lowered, whereby the bus bar 3
Since there is a possibility that the insulation between the closed container 1 and the closed container 1 may be broken and a ground fault may be induced, it is necessary to regularly clean the closed container 1 in such a vapor mist type gas-insulated electric device.

Further, in the vapor mist type gas-insulated electric equipment, the diffusion region of the vapor mist-like liquid insulator, that is, the maintainable range of the dielectric strength is limited, and the length of the hermetically sealed container 1 is restricted to a certain value or less. Therefore, in the case of supporting the long bus bar 3, the individual closed spaces are arranged in series like the vapor mist type gas insulated electric equipment shown in FIG. 13, and the vapor mist feeding is performed in each of the independent closed spaces. The delivery apparatus 2 and the concentration measuring apparatus 5 had to be arranged, and the vapor mist type gas insulated electrical equipment supporting the long bus bar 3 was extremely uneconomical.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a vapor mist type gas-insulated electric device capable of suppressing a decrease in dielectric strength.

Another object of the present invention is to provide a vapor mist type gas-insulated electric device which can reduce the number of parts, is highly economical, and can support a long conductor.

[0009]

A vapor mist-type gas-insulated electric apparatus according to the first aspect of the present invention comprises an airtight container for sealing an insulating gas and a vapor mist-like liquid insulator supplied from a vapor mist feeder. In a vapor-mist type gas-insulated electric device including an electric device having a conductor housed in a closed container and an insulating support that supports the conductor of the electric device and insulates the conductor from the closed container. ,
The insulating support is formed with a blocking portion for blocking the liquid flow formed by the liquid insulator condensed on the insulating support and allowing the liquid flow to drop directly on the bottom of the closed container.

Further, the vapor mist type gas-insulated electric equipment of the second invention is a hermetically sealed container in which an insulating gas and a vapor mist-like liquid insulator supplied from a vapor mist feeder are hermetically sealed, and Vapor mist gas insulation provided with an electric device having a conductor housed in a housing and a disc-shaped or conical insulating support that supports the conductor of the electric device and insulates the conductor from the closed container. In an electric device, a communication means is provided for communicating between adjacent spaces partitioned by the insulating support, and a recovery means for recovering the liquid insulator accumulated at the bottom of the closed container to the vapor mist feeding device is provided. Is.

[0011]

According to the first aspect of the invention, even if the vapor mist-like liquid insulator is condensed on the surface of the insulating support, the condensed droplets form a liquid flow path up to the dropping guide portion. The liquid reaching the portion does not drop directly from the dripping guide portion to the bottom of the closed container to form a flow path reaching the inner wall of the closed container, and the dielectric strength can be improved.

According to the second aspect of the invention, if the vapor mist-like liquid insulator is fed from one vapor mist feeding device to one of the spaces partitioned into a plurality of spaces, the communicating means from this space is provided. If the liquid insulator diffuses to all the other spaces via the, and the diffusing liquid insulator condenses in each space and stays at the bottom, the remaining liquid insulator is then collected and sent to the vapor mist feeder through the recovery means. Can be recovered.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. In each of the drawings, FIG. 1 is a partially cutaway perspective view showing an embodiment of the vapor mist type gas insulated electrical equipment of the first invention, and FIG. 2 is a vapor mist type gas insulated electrical equipment shown in FIG. 3 is a front view showing the insulating support of FIG.
5 is a front view showing an insulating support used in the vapor mist type gas insulated electric equipment of another embodiment of the first invention, and FIG. 6 is one example of the vapor mist type gas insulated electric equipment of the second invention. 7 and 9 are sectional views showing another embodiment of the vapor mist type gas insulated electric equipment of the second invention.

First, an embodiment of the first invention will be described.

As shown in FIG. 1, the vapor mist-type gas-insulated electric apparatus of the present embodiment is a hermetically sealed container in which an insulating gas and a vapor mist-like liquid insulator fed from the vapor mist feeder 2 are sealed. 1, an electric device having a conductor (bus bar) 3 housed in the closed container 1, and an insulating support 4 that supports the bus bar 3 of the electric device and insulates the bus bar 3 from the closed container 1. It is equipped with. And
The vapor mist feeder 2 is an atomizer including a tank 21 that stores a liquid insulator in a liquid state and a piezoelectric element that atomizes the liquid insulator contained in the tank 21 into a vapor mist state. 22 and a diffusing device 23 for diffusing the mist generated by the atomizer 22 into the closed container 1 as indicated by arrow A.

As shown in the enlarged view of FIG. 2, the insulating support 4 has three support rods 42 extending from the support portion 41 of the bus bar 3 to the inner wall of the closed container 1. It has a detour section 42A that once detours to the support section 41 side at an intermediate portion of the extension. The bypass portion 42A is formed as a cutoff portion that cuts off the liquid flow E formed by the liquid insulator condensed on the surface of the insulating support 4 without directly guiding it to the inner wall of the closed container 1. An object is designed to drop directly at the bottom of the closed container 1 at this blocking portion as shown by D in FIG. Each support rod 42 has a circular cross section as shown in FIG.

Therefore, according to this embodiment, the insulating support 4
Even if a vapor mist-like liquid insulator condenses on the surface of
The condensed droplets form a flow path E of the liquid to the detour 42A, and the liquid reaching the detour 42A has the detour 42A.
Therefore, as shown in FIG. 2D, it is possible to improve the dielectric strength without directly forming a flow path reaching the inner wall of the closed container 1 by dropping it directly on the bottom of the closed container 1.

The insulating support 4 in the embodiment shown in FIG. 3 has a disc shape as shown in an enlarged view in the figure, and a support portion 41 for supporting the bus bar 3 is formed at the center of the disc. Further, a plurality of arcuate and rounded U-shaped through holes 43 which are vertically and horizontally symmetrically formed are provided around it. The through hole 43 is formed as a blocking portion for blocking the liquid flow formed by the liquid insulator condensed on the surface of the insulating support 4 without directly guiding it to the inner wall of the closed container 1. At this shutoff portion, as shown by D in the figure, the liquid is directly dropped onto the bottom of the closed container 1.
Therefore, also in this embodiment, it is possible to obtain the same effects as those of the above embodiment.

Further, the insulating support 4 in the embodiment shown in FIG. 4, as shown in an enlarged view in the figure, is composed of a spiral round bar having a support portion 41 for supporting the bus bar 3 as a center. A spiral round bar is formed as a blocking portion that blocks the liquid flow formed by the liquid insulator condensed on this surface without directly guiding it to the inner wall of the closed container 1. Therefore, also in this embodiment, it is possible to obtain the same effects as those of the above-mentioned embodiments.

Further, the insulating support 4 in the embodiment shown in FIG. 5 has a disc shape as shown in an enlarged view in the figure, and a support portion 41 for supporting the bus bar 3 is formed at the center of the disc. In addition, a substantially spiral through hole 43 is formed as a blocking portion in the periphery thereof. Therefore, also in this embodiment, it is possible to obtain the same effects as those of the above-mentioned embodiments.

Next, an embodiment of the second invention will be described.

The vapor mist type gas-insulated electric equipment of this embodiment is an improvement of the one for supporting the long bus bar 3 shown in FIGS. 12 and 13. As shown in FIG. Except that it is formed in a disc shape, it is configured according to each embodiment of the first invention. That is, in the vapor mist type gas insulated electric device of this embodiment, the elongated closed container 1 is divided into a plurality of supporting spaces by using a plurality of disk-shaped insulating supports 4.

As shown in FIG. 6, the insulating support 4 is provided with a communication hole 45 in its lower portion for communicating the adjacent spaces. Then, one vapor mist feeder 2 is arranged in the closed container 1, and the liquid insulator is vapor-mist-shaped into the space defined at one end of the closed container 1 by the vapor mist feeder 2. The vaporized mist-like liquid insulator thus fed is configured to diffuse into each defined space through the communication hole 45 of each insulating support 4 arranged in the closed container 1. ing. Needless to say, the vapor mist feeding device 2 includes a tank 21 that stores a liquid insulator in a liquid state, a mist that uses a piezoelectric element that atomizes the liquid insulator contained in the tank 21 into a vapor mist state, and the like. The atomizer 22 and the diffusing device 2 for diffusing the mist generated by the atomizer 22 into the closed container 1 as indicated by arrow A.
3 and 3.

At the bottom of the closed container 1 forming a defined space at the other end of the closed container 1, there is provided a recovery pipe 7 for recovering the liquid insulator retained in this part to the vapor mist feeding device 2. A closed container 1 is provided by this recovery pipe 7.
It is configured to circulate the liquid insulation retained therein.

Therefore, according to the present embodiment, of the space of the hermetic container 1 divided into a plurality of parts by the insulating support 4 from one vapor mist feeder 2 arranged at one end of the hermetic container 1. If a vapor mist-like liquid insulator is fed into the defining space at one end of the above, it will diffuse from this defining space to all other defining spaces via the communication holes 45 of each insulating support 4, If the diffused liquid insulator condenses in the defined space at the other end and stays at the bottom, the staying liquid insulator is collected by the vapor mist feeding device via the collecting pipe 7 to remove the liquid insulator. Can be used in circulation. In addition, according to the present embodiment, it is not necessary to provide one vapor mist feeding device 2 in each defined space as in the conventional case, and
It can be done with the vapor mist feeder 2 of the stand,
The number of parts can be reduced as compared with the conventional one, and an economical vapor mist type gas insulated electric device can be provided.

Further, the vapor mist type gas-insulated electric device shown in FIG. 7 is provided with a bypass pipe 8 for communicating adjacent spaces defined by the insulating support 4 as shown in FIG. Are formed in the same manner as in the above embodiment. Therefore, also in this embodiment, it is possible to obtain the same effects as those of the above-mentioned embodiments.

In the vapor mist type gas-insulated electric equipment shown in FIG. 8, a solenoid valve 9 is provided in the bypass pipe 8 in the embodiment shown in FIG. 7, and this solenoid valve 9 is used as a concentration measuring device. 5 and the control device 6 are configured to appropriately control the flow rate of the vapor mist-like liquid insulator diffused into each of the defined spaces. Except for this point, the vapor mist type gas insulated electrical equipment of this embodiment has the same configuration as that shown in FIG. Therefore, according to the present embodiment, it is possible to achieve the same effects as those of the above-mentioned embodiments, and, in addition, to control the flow rate of the vapor mist-like liquid insulating material to be fed to each of the compartments as necessary. can do.

As shown in FIG. 9, the vapor mist type gas-insulated electric equipment shown in FIG. 9 further includes a flow meter 10 on the bypass pipe 8 and the solenoid valve 9 in the embodiment shown in FIG. The valve 9 and the flow meter 10 are configured to appropriately control the flow rate of the vapor-mist-like liquid insulator diffused into each defined space by the concentration measuring device 5 and the control device 6. Except for this point, the vapor mist type gas insulated electrical equipment of this embodiment has the same configuration as that shown in FIG. Therefore, according to this embodiment, it is possible to achieve the same effects as those of the above-mentioned embodiments, and further, by integrating the information obtained from the flow meter 10, the vapor mist-like liquid insulation of each defined space is obtained. It is possible to estimate the residual amount of the substance, and consequently reduce the number of installation locations of the concentration measuring instrument 5.

The first aspect of the present invention is not limited to the above-described embodiments, but the point is that the liquid flow formed by the liquid insulator condensed on the insulating support is shut off and the bottom of the closed container is closed. The present invention includes all vapor mist-type gas-insulated electrical equipment in which a blocking portion for direct dropping is formed on an insulating support.

The second invention is also not limited to the above-mentioned embodiments, and the point is that a communication means for communicating the adjacent spaces defined by the insulating support is provided and the bottom of the closed container is provided. The present invention includes all vapor mist-type gas-insulated electrical equipment provided with a recovery means for recovering the liquid insulation accumulated in the above into the vapor mist feeder.

[0031]

As described above, according to the first aspect of the present invention, it is possible to provide a vapor mist type gas insulated electric device capable of suppressing a decrease in dielectric strength.

Further, according to the second invention, it is possible to provide a vapor mist type gas-insulated electric device which can reduce the number of parts, is highly economical, and can support a long conductor. ..

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a vapor mist type gas insulated electric device of the first invention.

FIG. 2 is a front view showing an insulating support of the vapor mist type gas insulated electric device shown in FIG.

FIG. 3 is a front view showing an insulating support used in a vapor mist type gas insulated electric device according to another embodiment of the first invention.

FIG. 4 is a front view showing an insulating support used in a vapor mist type gas insulated electric device according to still another embodiment of the first invention.

FIG. 5 is a front view showing an insulating support used in a vapor mist type gas insulated electric device according to still another embodiment of the first invention.

FIG. 6 is a cross-sectional view showing an embodiment of a vapor mist type gas insulated electric device of the second invention.

FIG. 7 is a cross-sectional view showing another embodiment of the vapor mist type gas insulated electric device of the second invention.

FIG. 8 is a cross-sectional view showing still another embodiment of the vapor mist type gas insulated electric device of the second invention.

FIG. 9 is a cross-sectional view showing still another embodiment of the vapor mist type gas insulated electric device of the second invention.

FIG. 10 is a partially cutaway perspective view showing an example of a conventional vapor mist type gas insulated electric device.

11 is a front view showing the insulating support of the vapor mist type gas insulated electric device shown in FIG.

FIG. 12 is a partially cutaway perspective view showing another example of the conventional vapor mist type gas insulated electric device.

13 is a cross-sectional view showing the entire vapor mist type gas insulated electric device shown in FIG.

[Explanation of symbols]

 1 Airtight Container 2 Vaper Mist Feeder 3 Bus Bar (Conductor) 4 Insulating Support 7 Recovery Pipe (Recovery Means) 42A Detour (Blocking Section) 43 Through Hole (Blocking Section) 45 Communication Hole (Communication Means)

Claims (2)

[Claims] 1. An electric appliance having an airtight container in which an insulating gas and a vapor mist-like liquid insulator fed from a vapor mist feeder are hermetically sealed, a conductor housed in the hermetic container, and In a vapor mist-type gas-insulated electric device supporting an electric conductor and having an insulating support for insulating between the conductor and the closed container, a liquid flow formed by the liquid insulator condensed on the insulating support is generated. A vapor mist-type gas-insulated electric device, characterized in that the insulating support is formed with a shut-off portion for shutting off and dropping directly onto the bottom of the closed container. 2. An electric device having an airtight container in which an insulating gas and a vapor mist-like liquid insulating material fed from a vapor mist feeding device are hermetically sealed, a conductor housed in the hermetically sealed container, and an electric device In a vapor-mist type gas-insulated electric device which is provided with a disk-shaped or conical insulating support which supports a conductor and insulates between the conductor and the closed container, the vapor-mist type gas-insulated electrical equipments are adjacent to each other and are partitioned by the insulating support A vapor-mist type gas-insulated electric device comprising: a communication means for communicating the space; and a recovery means for recovering the liquid insulation retained at the bottom of the closed container to a vapor mist feeding device.