JPH04105505A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To prevent deterioration of insulation by filling adhesive insulator in a bottom or a recess formed in the bottom of a vessel of a gas insulated apparatus sealed with insulation gas and containing charging conductor, and collecting a foreign matter generated in the vessel. CONSTITUTION:Charging conductors 35, 36 are inserted into a vessel 34 through insulating spacers 38, 39. An opening 40 directly above the vessel 34 is opened, a detachable conductor 37 is removed, inspected, maintained or replaced, and again mounted. A recess 41 protruding externally is formed directly under the conductor 37, and adhesive insulator 42 is filled therein. The entire bottom of a vessel 43 in which a bus 47 is passed is coated with adhesive insulator 46. Thus, a foreign matter generated in the vessel is collected to prevent deterioration of insulating performance to improve reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Field of Industrial Application) The present invention relates to a gas insulated switchgear, and particularly to an improvement in a technique for trapping foreign matter mixed into a container thereof.

(Prior Art) Generally, when assembling a gas insulated switchgear, great care is taken to prevent foreign matter such as metal pieces from getting into the container. Foreign matter mixed into the container causes random movement between the high-voltage part and the container due to the operating voltage, triggering insulation breakdown and causing a significant drop in insulation performance, such as ground faults. This is because there is fear. However, it is impossible to completely prevent foreign matter from entering during actual assembly.

In addition, in particular, gas-insulated switches such as disconnectors have their contacts housed in a container filled with insulating gas, and are opened and closed by operating the contacts. During such opening and closing, dust such as metal pieces and arc products are generated at the contact portions that are mechanically connected and separated.

In particular, when the gas insulated switch is placed horizontally as shown in FIG. 6, dust and the like accumulate on the insulating spacer, resulting in a decrease in dielectric strength (insulating performance).

Furthermore, in the detachable bus bar, foreign matter is likely to be generated at the detachable portion when the detachable conductor is attached or detached, and foreign matter is also likely to be mixed in from the outside through the working opening.

To address this inconvenience, as shown in Figure 6, a dedicated foreign matter collection section is provided inside the container as a means of capturing foreign matter such as dust and arc products in the container. Methods have been proposed to avoid this deterioration in insulation performance.

That is, in the gas insulated switch 1 shown in FIG.
A fixed side electrode 3 and a movable side electrode 4 are horizontally arranged to face each other in a container 2 filled with an insulating gas and at a ground potential. The space between the fixed electrode 3 and the movable electrode 4 is opened and closed by a movable contact 5 that operates horizontally while sliding with respect to the picture electrode section. Further, the fixed side electrode 3 is connected to an insulating spacer 6 provided on the right end surface of the container 2.
Supported by On the other hand, the movable electrode 4 is supported by a conductor 8 established on an insulating spacer 7 provided horizontally on the lower left side of the container 2 .

Note that the movable contactor 5 is fixed to one end of an operating rod 9 inserted into the movable side electrode 4, and this operating rod 9
The other end is pulled out from the left end surface of the container 2 and is connected to the operating mechanism 10.
It is connected to the operating device 11 via. That is, the operating force from the operating device 11 is transmitted to the movable contact 5 via the operating mechanism 10 and the operating rod 9, and the movable contact 5 is driven.

Directly below between the fixed electrode 3 and the movable electrode 4 of the container 2, a foreign matter collection space (a foreign matter collection section ) 14 are formed. In this case, metal disk 1
As shown in FIG. 7, the many holes 13a provided in 3 are elongated holes extending in the same direction. Further, the metal disk 13 is supported by a support fitting 15 at approximately the same height as the original bottom of the container 2, and is maintained at the same ground potential as the container 2.

As described above, the foreign matter collection space 14 formed by the metal disk 13 and the branch pipe portion 12 is maintained in a low electric field. As a result, foreign matter 16 such as dust and arc products that repeatedly undergo complicated random movements due to the operating voltage can be trapped in the gap between the metal disk 13 and the branch pipe section 12 or in the hole 13a provided in the metal disk 13.
This prevents foreign matter from entering the foreign matter collection space 14 and returning to the main body space of the container 2, that is, the space containing high voltage parts such as the fixed electrode 3 and the movable electrode 4.

(Problems to be Solved by the Invention) However, the conventional gas insulated switchgear configured as described above has the following drawbacks.

In other words, if the foreign object 16 that moves in a complicated manner falls onto the surface of the metal disc 13 other than the hole 13a, it will collide with the metal disc 13, be repelled, and fall back onto the fixed electrode. Since the foreign matter 16 flies toward high voltage parts such as the movable electrode 4 and the foreign matter 16, it is impossible to completely capture the foreign matter 16. Therefore, in the end, a certain amount of foreign matter remains in the space containing the high voltage section, that is, the gas space that is involved in insulation performance, and it has not been possible to reliably prevent the insulation performance from deteriorating.

In addition, if the foreign object 16 is simply captured in the foreign object collection space 14 with a low electric field, there is a risk that the captured foreign object 16 will fly out into the main body space again due to the operation vibration of the switch, etc.
In order to prevent this, it was necessary to increase the depth H of the branch pipe portion 12. When the depth H of the branch pipe section 12 is increased in this way, the protrusion dimension of the branch pipe section 12 from the bottom of the container 2 becomes large, so that it is necessary to secure various necessary spaces such as an inspection passage. For these reasons, the gas insulated switchgear has the drawback of increasing its size as a whole.

The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to be able to reliably capture foreign matter generated or mixed into a container without increasing the size of the device. By making it possible to reliably maintain the trapped foreign matter without returning it to the gas space inside the container, which affects the insulation performance, a highly reliable gas-insulated switch with excellent insulation performance can be achieved. The purpose is to provide equipment.

[Structure of the Invention] (Means for Solving the Problems) A gas insulated switchgear according to the present invention stores a conductor of a live part inside a container and is filled with an insulating gas. The container is characterized by being filled with an adhesive insulator, or by forming a recess at the bottom of the container, and filling the recess with an adhesive insulator.

In this case, it is desirable that the bottom of the container or the recess formed in the bottom of the container be filled with the adhesive insulator to a depth of several millimeters to several tens of millimeters. Furthermore, it is desirable to use a gel-like insulator as the adhesive insulator.

Furthermore, the recess formed in the bottom of the container must be located almost directly below a pair of electrodes that constitute a disconnector or a grounding switch, or almost directly below a detachable conductor that constitutes a detachable bus bar. is desirable.

(Function) In the gas insulated switchgear of the present invention having the above configuration, the adhesive insulator filled in the bottom of the container or the recess formed in the bottom of the container reliably removes foreign matter generated inside the container. Furthermore, the trapped foreign matter can be maintained in the trapped state without being returned to the gas space within the container that is involved in the insulation performance, so the insulation performance will not be degraded.

In this case, the filling depth of the adhesive insulator is several mm to several tens of mm.
A depth of 0 mm is sufficient, so even if the bottom of the container is filled with adhesive insulating material, or even if a recess is provided at the bottom of the container and filled with adhesive insulating material, the space inside the container can be reduced. There is no need to narrow the space, and therefore there is no need to increase the size of the device.

Furthermore, when a gel-like insulator such as silicone gel is used as the adhesive insulator, the viscosity can be freely changed and the initial viscosity can be maintained for a long period of time. By selecting the optimal adhesiveness for trapping foreign matter, foreign matter can be captured more reliably and insulation performance can be improved.

Furthermore, since the pair of electrodes constituting the disconnector or the earthing switch and the detachable conductor constituting the detachable bus bar are susceptible to foreign matter due to their functions, the bottom of the container almost directly below these electrodes or the detachable conductor If a recess is formed in the recess and filled with an adhesive insulator, foreign matter can be captured more efficiently.

(Example) An example of the gas insulated switchgear according to the present invention will be described below.
This will be explained in detail with reference to FIG.

In the gas insulated switch 17 shown in FIG. 1, a fixed electrode 19 and a movable electrode 20 are housed horizontally and face each other in a container 18 filled with an insulating gas and having a ground potential. .

A movable contact 21 is arranged inside the movable electrode 20 so as to be horizontally movable. This movable contactor 21 moves horizontally while sliding with respect to the movable side electrode 20,
This fixed side electrode 1 is inserted into and removed from the fixed side electrode 19.
9, thereby opening and closing the gas insulated switch 17.

Further, the fixed side electrode 19 is insulated and supported by an insulating spacer 22 provided on the right end surface of the container 18, and is connected to a conductor 23 of an adjacent device (not shown) via this insulating spacer 22. .

On the other hand, the movable side electrode 20 is supported by a conductor 25 established in an insulating spacer 24 provided horizontally on the lower left surface of the container 18, and is connected to an adjacent (not shown) via the conductor 25 and the insulating spacer 24. It is connected to the equipment conductor 26.

The movable contactor 21 is fixed to one end of an operating rod 27 inserted into the movable electrode 20, and the other end of the operating rod 27 is pulled out from the left end surface of the container 18 to operate the operating mechanism 28. It is connected to the operating device 29 via the controller. That is, the operating force from this operating bag W29 is applied to the operating mechanism 2.
8 and the operating rod 27 to the movable contact 21, so that the movable contact 21 is driven.

According to the present invention, a recess 30 protruding to the outside is located directly below the fixed electrode 19 and the movable electrode 20 of the container 18.
is provided and filled with an adhesive insulator 31 to catch fallen foreign objects 32.

Note that as the adhesive insulator 31 filled in the recess 30, for example, a gel-like insulator can be used, and in particular, it has the above-mentioned advantages, that is, the viscosity can be freely changed, and it can be used for a long period of time. It is desirable to use silicone gel, which has the advantage of being able to maintain its initial viscosity over a period of time.

Next, the operation of this embodiment as described above will be explained.

That is, when the gas insulated switch 17 shown in FIG. It falls into the recess 30. In this case, since the recess 30 is filled with the adhesive insulator 31, the fallen foreign object 32 adheres to the adhesive insulator 31, is adhesively captured, and is held in a trapped state by its adhesive force. . That is, since it is impossible for the foreign matter 32 once captured to move from the adhesive insulator 31 to the gas space again and scatter, the foreign matter 32 in the gas space can be efficiently and reliably captured.

In addition, in this embodiment, a recess 30 is provided directly below the opening/closing part where foreign matter is likely to occur, that is, between the fixed electrode 19 and the movable electrode 20 of the container 18, and the adhesive insulator 31
Because it is filled with , foreign matter can be captured more efficiently.

As a result, the foreign matter 32 is moved between the high voltage section and the container 1 due to the operating voltage.
It is possible to prevent dielectric breakdown caused by flying between 8 and 8.

Further, since the foreign matter 32 does not move or accumulate on the insulating spacer 24, the dielectric strength of the insulating spacer 24 can be maintained well, and ground faults due to creepage breakdown of the insulating spacer 24 can be prevented.

As described above, in this embodiment, the gas insulated switch 1
The insulation performance of No. 7 can be significantly improved compared to the conventional method. As a result, when designing insulation, equipment dimensions can be determined based on the assumption that foreign objects can be completely captured, so the container dimensions can be significantly reduced compared to conventional methods by preventing foreign objects from flying inside the container. can be converted into Furthermore, since the foreign matter 32 is captured by the adhesive force of the adhesive insulator 31, the depth H of the recess 30 of the container 17 is a dimension sufficient to fill the adhesive insulator 31, more specifically, mm to number 1
Since it is possible to make it extremely shallow at 0 mm, the protrusion of this part to the outside of the container is, compared to the diameter of the container.
is rarely a problem.

Therefore, compared to the prior art in which the branch pipe portion 12 largely protrudes, it is easier to secure various necessary spaces such as an inspection passage, and it can also contribute to downsizing the entire gas insulated switchgear.

On the other hand, when silicone gel is used as the adhesive insulator 31 in this embodiment, the viscosity can be freely adjusted and the initial viscosity can be maintained for a long period of time, so that foreign particles By adjusting the viscosity to be optimal for trapping No. 32, foreign matter can be trapped more reliably and insulation performance can be improved.

In addition, regarding the characteristics of such silicon gel,
Some explanation will be added using Table 1 on the next page.

That is, silicon gel is a material that hardens into a gel-like state after about 16 hours by mixing two types of liquids, liquid A and liquid B, and is a fluid liquid at the beginning of mixing. If it is injected into a container and filled while it has fluidity, it will harden and become a gel.

Further, the viscosity of the silicone gel can be freely changed by changing the mixing ratio of liquid A and liquid B.

(Leaving space below) Table 1 - General characteristics of silicone gel Therefore, in this example, when using this silicone gel as the adhesive insulator 31, the viscosity of the silicone gel is the optimum viscosity for trapping the foreign matter 32. By mixing liquid A and liquid B at a mixing ratio such that the mixture has fluidity, the mixture is injected and filled into the recess 30 inside the container 18, and then hardens into a gel. At this point, the silicone gel has a viscosity that is optimal for trapping the foreign matter 32, and this viscosity is maintained over a long period of time, so it can prevent the foreign matter 32 that is generated during many opening and closing operations over a long period of time. Can be captured reliably. Therefore, even after many opening and closing operations, the original insulation performance between the high voltage section and the container 18 is maintained well over a long period of time.

In the above embodiment, the present invention was applied to a gas insulated switch among gas insulated switchgears, but the present invention is not limited to a gas insulated transformer. As shown in the figure, similar excellent effects can be obtained even when applied to a detachable bus bar.

In the removable busbar 33 shown in FIG.
．． 36 and a detachable conductor 37 that connects them are housed horizontally. In this case, the conductors 35, 36 on both sides are
They are insulated and supported by insulating spacers 38 and 39 provided on the left and right end surfaces of the container, respectively. Also,
Immediately above the removable conductor 37 of the container 34 is an opening for removing the removable conductor 37 from the conductor 35.36 and taking it out to the outside, or inserting the removable conductor 37 from the outside and connecting it between the conductors 35.36. 40 are provided.

A recess 41 protruding to the outside is provided directly below the removable conductor 37 of the container 34, and is filled with an adhesive insulator 42.

Also in the embodiment of FIG. 2 having the above configuration,
Exactly the same effects as in the previous embodiment can be obtained. That is, it is possible to reliably capture foreign matter generated or mixed inside the container 34, and the captured foreign matter is left in the trapped state without returning it to the gas space that is involved in the insulation performance within the container. Since it can be maintained, insulation performance can be improved. In particular, in this embodiment, a recess 41 is provided directly under the removable part where foreign matter is likely to be generated or mixed in, that is, the removable conductor 37 of the container 34, and is filled with an adhesive insulator 42, making it more efficient. It can capture foreign objects. In the embodiment shown in FIG.
corresponds to the action of

Further, the present invention can also be applied to ordinary busbars and other equipment, and similarly excellent effects can be obtained. In particular, when applied to a normal bus bar, it is also possible to fill the bottom of the container with the adhesive insulator as it is without providing the four parts.

For example, even in a simple bus bar, if consideration is given to the possibility that foreign matter may remain inside the conductor and fall into the gas due to operational vibrations, etc., a cylindrical container 4 as shown in FIGS.
The adhesive insulator 46 is spread over the entire length between the insulating spacers 44 and 45 at the bottom of 3 to a depth D1, specifically, several meters.
An embodiment in which the thickness is filled from m to 10-odd mm can be considered. In addition,
47 in FIGS. 3 and 4 is a conductor. In this embodiment as well, the same effects as in each of the above-described embodiments can be obtained.

Further, as shown in FIG. 5, a conductor 48 branched into a T-shape
In the T-shaped branched container 49 containing
Branch portion 50 and insulating spacer 51 at the bottom of container 49
．． Similar effects can be obtained by similarly filling the space between the adhesive insulator 52 and the adhesive insulator 53. In addition, 54 in FIG. 5 is an insulating spacer provided at the end of the branch part 51.

Furthermore, the present invention is not limited to the above embodiments, and for example, it is also possible to use materials other than silicone gel as the adhesive insulator.

[Effects of the Invention] As explained above, in the present invention, the bottom of the container is filled with an adhesive insulator, or a recess is formed in the bottom of the container, and the recess is filled with an adhesive insulator. This makes it possible to reliably capture foreign matter generated or mixed into the container by adhering it to the adhesive insulator, without increasing the size of the device, and to prevent the captured foreign matter from affecting the insulation performance of the container. Since the captured state can be reliably maintained without being returned to the gas space where the gas is stored, it is possible to provide a highly reliable gas insulated switchgear with excellent insulation performance.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a gas insulated switch according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a detachable busbar of another embodiment according to the present invention, and FIG. FIG. 4 is a sectional view taken along the arrow I in FIG. 3; FIG. 5 is a sectional view showing the generatrix of still another embodiment of the invention. . FIG. 6 is a sectional view showing an example of a conventional gas insulated switch;
7 is a plan view showing a metal disc in the gas insulated switch of FIG. 6. FIG. DESCRIPTION OF SYMBOLS 1... Gas insulated switch, 2... Container, 3... Fixed side electrode, 4... Movable side electrode, 5... Movable contact, 6
, 7... Insulating spacer, 8... Conductor, 9... Operating rod, 10... Operating mechanism, 11... Operating device, 1
2... Branch pipe portion, 13... Metal disc, 13a...
Hole, 14... Foreign matter collection space, 15... Support metal fitting, 1
6...Foreign object. 17... Gas insulated switch, 18... Container, 19...
- Fixed side electrode, 20... Movable side electrode, 21... Movable contact, 22.24-1. Insulating spacer, 23, 25.
26... Conductor, 27... Operating rod, 28... Operating mechanism, 29... Operating device, 30... Recess, 31...
...Adhesive insulator, 32...Foreign object. 33...Detachable busbar, 34...Container, 35.36...
・Conductor, 37... Detachable conductor, 38. 39... Insulating spacer, 40... Opening, 41... Recess, 42...
・Adhesive insulator. 43... Container, 44.45... Insulating spacer, 46
...Adhesive insulator, 47...Conductor. 48... Conductor, 49... Container, 50... Branch part,
51°52.54...Insulating spacer, 53...Adhesive insulator.

Claims (1)

[Claims] In a gas insulated switchgear in which a conductor of a live part is housed inside a container and is filled with an insulating gas, the bottom of the container is filled with an adhesive insulator, or a recess is formed in the bottom of the container. A gas insulated switchgear characterized in that a recess is filled with an adhesive insulator.