JP2000350318A - Gas insulated grounding switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas insulated switchgear with a simple and small structure. SOLUTION: Main circuital conductors 1a, 1b, and 1c are supported in an insulated state in a metallic container 3. The main circuital conductors 1a, 1b, and 1c have movable-side contacts 5a, 5b, and 5c to be connected and disconnected with stationary-side contacts 4a, 4b, and 4c. The stationary-side contacters 4a, 4b, and 4c are supported in an insulated state by grounding conducts 10a, 10b, and 10c, and an insulating terminal 11 in the metallic container 3 and also drawn outside in an insulated state from the metallic container 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated ground switch used in a gas-insulated switchgear.

[0002]

In general, gas insulated switchgear, the insulating gas such as SF ₆ gas is sealed, and the main circuit conductor to a grounded metal container is housed, to ensure safety during maintenance and inspection work In addition, a grounding switch for grounding the main circuit conductor from outside is required. The earthing circuit of this earthing switch is insulated from the metal container and pulled out to the outside to measure the insulation resistance and contact resistance of the main circuit conductor and the switching characteristics of the circuit breaker and disconnector. Grounded.

FIGS. 7 and 8 show an example of such a conventional gas-insulated ground switch. 7 is a cross-sectional view of a main part of a conventional gas-insulated grounding switch, and FIG. 8 is a cross-sectional view of the gas-insulated grounding switch of FIG. 7 taken along line EE.

[0004] In FIG. 7 and FIG.
a, 1b and 1c are insulated and supported by a metal container 3 via an insulating spacer 2. The main circuit conductors 1a, 1b, 1c and the ground-side contact portions 4a, 4b, 4c respectively drive an operating device 7 in which ground blades 5a, 5b, 5c are attached to the outside of the metal container 3 via the insulation 6. It opens and closes by contacting and separating from the ground-side contact portions 4a, 4b, 4c.

[0005] Also, the ground-side contact portions 4a, 4b, 4c are:
The supporting member 8 and the insulating plate 9 insulate and support the metal container 3, and also include ground conductors 10 a, 10 b, and 10 c and a conductor (hereinafter, referred to as an insulating terminal) 1 embedded in an insulator.
It is drawn out insulated from the metal container 3 via 1a, 11b, 11c.

[0006]

However, in the conventional gas-insulated ground switch as described above, the ground-side contact portion 4 is not provided.
a, 4b, and 4c are insulated from the metal container 3 (the supporting member 8 and the insulating plate 9), and a conductor portion (the ground conductors 10a, 10b, and 10c) that is insulated and pulled out to the outside.
And the insulating terminals 11a, 11b, 11c) are separated from each other.
Since a space for accommodating them is required, and the metal container 3 is correspondingly large, it has been difficult to reduce the size of the grounding switch.

The present invention has been made in consideration of the above circumstances, and has as its object to provide a gas insulated switchgear having a simplified structure and a reduced size.

[0008]

According to a first aspect of the present invention, a main circuit conductor is insulated and supported by a metal container, and the main circuit conductor can be brought into contact with and separated from a fixed contact portion. In the gas-insulated grounding switch provided with the movable-side contact portion, the fixed-side contact portion is insulated and supported by the metal container with a ground conductor and an insulating terminal, and is insulated from the metal container and pulled out to the outside. It is characterized by the following.

According to the first aspect of the present invention, the fixed-side contact portion is insulated and supported by the metal container by the ground conductor and the insulating terminal, and is insulated from the metal container and pulled out to the outside. This eliminates the need for a support member that insulates and supports the fixed-side contact portion from the metal container, so that the structure can be simplified and the grounding switch can be downsized.

According to a second aspect of the present invention, in the gas insulated grounding switch according to the first aspect, the insulating terminal is formed by embedding a three-phase conductor in one insulator.

According to the second aspect of the present invention, the insulated terminal is formed by integrally embedding a three-phase external lead conductor in one insulator. Has been mounted, but can be mounted together at one place, and the grounding switch can be further reduced in size.

The invention described in claim 3 is the first or second invention.
In the gas insulated ground switch described above, the insulated terminal and the three-phase fixed-side contact portion are arranged on a straight line.

According to the third aspect of the present invention, the insulating terminal and the three-phase ground-side contact portion are arranged on a straight line,
The opening of the metal container for inserting these can be reduced, and the grounding switch can be reduced in size.

[0014] The invention according to claim 4 is the invention according to claim 1 or 3.
In the gas-insulated grounding switch described, the external dimensions of the three-phase fixed-side contact portions and the grounding conductor that supports and fixes them are
It is characterized in that it is formed in a size that can be inserted into an opening provided in the metal container.

According to the fourth aspect of the present invention, the external dimensions of the three-phase fixed-side contact portion on a straight line and the grounding conductor for supporting and fixing the fixed-side contact portion are formed to have a size that can be inserted into the opening provided in the metal container. Thus, after the three-phase fixed-side contact portion is assembled to the insulated terminal outside the metal container, it can be inserted from the opening provided in the metal container, and the assembling work is facilitated.

According to a fifth aspect of the present invention, in the gas insulated grounding switch of the third aspect, the position at which the insulating terminal is supported and fixed to the metal container drives the movable contact portion with respect to the circumferential direction of the metal container. It is characterized by being on the side opposite to the mounting position of the operating device to be operated.

According to the fifth aspect of the present invention, since the operating device for driving the grounding switch is disposed on the side opposite to the side where the insulating terminal is supported and fixed to the metal container, the operation of the insulating mounting portion and the grounding switch is performed. Since there is no interference with the mounting portion of the device, the arrangement configuration becomes easy.

According to a sixth aspect of the present invention, in the gas insulated grounding switch of the third aspect, the insulating terminal and the operating device for driving the movable contact portion are supported and fixed on the same side in the circumferential direction of the metal container. It is characterized by.

According to the present invention, the insulating terminal and the operating device for driving the grounding switch are arranged on the same side of the metal container, so that the insulating mounting portion of the metal container and the operating device for the grounding switch are arranged. The mounting part can be shared, the number of parts can be reduced, the maintenance space for manual operation of the earthing switch, and the measurement of insulation resistance, contact resistance measurement, switching characteristic measurement, etc. Since the maintenance space for separating the ground circuit can be shared by the mounting portion of the insulated terminal, the size of the entire gas insulated switchgear can be reduced.

The invention according to claim 7 is the invention according to claim 1 or 4.
In the gas insulated grounding switch described in the above, it is preferable that the
The ground conductor connected to the phase is formed in an L-shaped cross section,
It is characterized in that these grounding conductors are arranged in directions rotated by 90 ° from each other.

According to the seventh aspect of the present invention, the ground conductors connected to the two phases close to the insulating terminals are formed in an L-shaped cross section, and these ground conductors are arranged in a direction rotated by 90 ° with respect to each other. By increasing the bending strength, it is possible to endure the short-circuit electromagnetic force with the light-weight ground conductor.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is a sectional view showing a main part of a first embodiment of a gas insulated grounding switch according to the present invention, and FIG.
FIG. 2 is a sectional view taken along line AA of the gas insulated grounding switch of FIG. 1. In each drawing, the same parts as those in FIGS. 7 and 8 are denoted by the same reference numerals, and description thereof will be omitted.

In FIGS. 1 and 2, an opening 12 for mounting equipment is formed in the metal container 3, and the opening 12 is tightly closed by a cover plate 13. In the metal container 3, main circuit conductors 1a, 1b,
1c is positioned, and these main circuit conductors 1a, 1b, 1
c is insulated and supported by the metal container 3 via the insulating spacer 2. The main circuit conductors 1a, 1b, 1c and the ground-side contact portions 4a, 4b, 4c as the fixed-side contact portions are respectively connected to the grounding blades 5a, 5b, 5c as the movable-side contact portions via the insulating member 6. 3 is rotated by driving the operation device 7 attached to the outside, and the contact portions 4a, 4 on the ground side are rotated.
It opens and closes by coming into contact with and separating from b and 4c.

The ground-side contact portions 4a, 4b, 4c are insulated and supported by the metal container 3 by the grounding conductors 10a, 10b, 10c and insulating terminals 11 in which a three-phase conductor is embedded in an insulator. It is insulated from and pulled out to the outside. Here, when a short-time current flows through the ground circuit,
In order to prevent the ground conductors 10a, 10b, 10c from being deformed by the electromagnetic force, the insulating plate 9 is connected to the ground side contact portions 4a, 4b, 4b.
4c.

Next, the operation of the present embodiment will be described.

In this embodiment, the ground-side contact portions 4a, 4b,
4c is insulated and supported by the metal container 3 by the ground conductors 10a, 10b, 10c and the insulating terminals 11, and
By pulling it out from the metal container 3 as in the prior art, a supporting member for insulating and supporting the ground side contact portions 4a, 4b, 4c is not required, and the structure can be simplified, and the ground can be opened and closed. It is possible to reduce the size of the container.

That is, the three-phase ground-side contact portion 4 is connected to the one insulating terminal 11 via the ground conductors 10a, 10b, and 10c.
By supporting and fixing a, 4b, and 4c, a special support member is not required, the structure is simplified, and a gas-insulated grounding switch that is easy to assemble is obtained.

Further, by using a three-phase external lead conductor integrally embedded in one insulator as the insulating terminal 11, conventionally, the insulating terminal was attached to each of the three locations of the metal container 3. In the present embodiment, the grounding switch can be further reduced in size because the grounding switch can be mounted at one place.

[Second Embodiment] FIG. 3 is a sectional view showing a second embodiment of the gas-insulated grounding switch according to the present invention, and FIG.
(A), (B) and (C) are cross-sectional views taken along line BB in FIG. 3, cross-sectional views taken along line CC in FIG. 3, cross-sectional views taken along line DD in FIG. 3, and FIG. FIG. 4 is a perspective view showing a ground conductor of FIG.
FIG. 5 shows only the ground-side contact portions 4a, 4b, 4c and the ground conductors 10a, 10b, 10c, and other members are omitted.

In FIG. 3, the main circuit conductors 1a, 1b, 1
c is insulated and supported by the metal container 3 via the insulating spacer 2 similarly to the gas insulated ground switch of the first embodiment.
Main circuit conductors 1a, 1b, 1c and ground side contact portions 4a, 4
b and 4c are the ground blades 5a, 5b and 5c, respectively.
Is rotated by driving the operating device 7 attached to the outside of the metal container 3 via the insulating member 6 to rotate, and the ground-side contact portions 4a,
It is opened and closed by contacting and separating from 4b and 4c.

The three-phase ground-side contact portions 4a, 4b, 4c and the insulating terminal 11 insulated and supported by the metal container 3 are arranged in a straight line, as shown in FIGS. 4 (A) to 4 (C) and FIG. As shown, ground conductors 10 each formed in an L-shape
a, 10b, and 10c are integrally fixed. here,
In order to prevent the ground conductors 10a, 10b, 10c from being deformed by electromagnetic force when a short-time current flows through the ground circuit,
As shown in FIGS. 4A to 4C, the ground conductors 10a, 10b, and 10c are mechanically and integrally fixed via an insulating plate 9.

The three-phase ground contact portions 4a, 4b, 4
c and ground conductors 10a, 10
The external dimensions of b and 10c are formed so that they can be inserted into openings (not shown) provided in the metal container 3.

Further, in the present embodiment, the position where the insulating terminal 11 is supported and fixed to the metal container 3 is set at the position where the operating device 7 for driving the ground blades 5a, 5b, 5c in the circumferential direction of the metal container 3 is attached. On the other side.

In this embodiment, the cross-sectional shape of the ground conductor connected to the two phases near the insulating terminal 11 is formed in an L-shape, and these ground conductors are arranged in a direction rotated by 90 ° from each other.

As described above, according to this embodiment, the three-phase ground-side contact portions 4a, 4b, 4c and the insulating terminals 11 insulated and supported by the metal container 3 are arranged in a straight line.
The size of the opening for inserting the three-phase ground-side contact portions 4a, 4b, 4c and the insulating terminal 11 into the metal container 3 is determined by the first size.
The gas insulated grounding switch can be reduced in size, as compared with the embodiment.

Also, the three-phase ground-side contact portions 4 on a straight line
a, 4b, 4c and ground conductor 1 for supporting and fixing them
The three-phase ground-side contact portions 4a, 4b, 4c are insulated outside the metal container 3 by forming the outer dimensions of 0a, 10b, 10c such that they can be inserted into the openings provided in the metal container 3. After assembling to the terminal 11, it can be inserted from the opening provided in the metal container 3, and the assembling work becomes easy.

Further, the position where the insulating terminal 11 is supported and fixed to the metal container 3 is opposite to the portion where the operating device 7 for driving the movable-side contact portion is mounted in the circumferential direction of the metal container 3 so as to be insulated. Since the mounting portion of the terminal 11 and the mounting portion of the operating device 7 of the grounding switch do not interfere with each other, the arrangement and configuration are simplified.

In this embodiment, the ground conductors 10b and 10c connected to the two phases close to the insulating terminal 11 are formed in an L-shaped cross section, and
By arranging b and 10c in directions rotated by 90 ° with respect to each other, the bending strength can be increased, and the ground conductor whose weight is reduced can withstand a short-circuit electromagnetic force.

[Third Embodiment] FIG. 6 is a sectional view showing a third embodiment of the gas-insulated grounding switch according to the present invention. 6, in this embodiment, the insulating terminal 11 and the operating device 7 for driving the ground blades 5a, 5b, 5c are supported and fixed on the same side in the circumferential direction of the metal container 3. The other configuration is the same as that of the second embodiment, and a description thereof will be omitted.

As described above, according to the present embodiment, the insulating terminal 11 is arranged in the same direction as the operating device 7 with respect to the circumferential direction of the metal container 3. And the part to which the insulating terminal 11 is attached can be integrally formed, and the size of the gas insulated grounding switch can be reduced.

Further, it is possible to share the operation space of the operation device 7 and the work space for disconnecting the ground circuit at the insulating terminal 11 for the measurement of insulation resistance, contact resistance, and measurement of switching characteristics during maintenance and inspection work. From what you can do,
The size of the entire gas insulated switchgear can be reduced.

[0043]

As described above, according to the present invention,
The fixed-side contact portion is insulated and supported by the metal container with the ground conductor and the insulating terminal, and is insulated from the metal container and pulled out to simplify the structure and reduce the size of the ground switch. Becomes possible.

Further, by optimizing the arrangement relationship between the insulating terminals and the operating device, the size of the entire gas insulated switchgear can be reduced, and at the same time, the maintenance and inspection workability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of a gas insulated grounding switch according to the present invention.

FIG. 2 is a cross-sectional view of the gas insulated grounding switch of FIG. 1 taken along line AA.

FIG. 3 is a sectional view showing a second embodiment of the gas-insulated grounding switch according to the present invention.

4A, 4B, and 4C are cross-sectional views taken along line BB in FIG. 3, cross-sectional views taken along line CC in FIG. 3, and DD lines in FIG.
Sectional view by line.

FIG. 5 is a perspective view showing a ground conductor of FIG. 3;

FIG. 6 is a sectional view showing a third embodiment of the gas-insulated grounding switch according to the present invention.

FIG. 7 is a sectional view of a main part showing a conventional gas-insulated grounding switch.

FIG. 8 is a cross-sectional view of the gas insulated grounding switch of FIG. 7 taken along line EE.

[Explanation of symbols]

 1a, 1b, 1c Main circuit conductor 2 Insulating spacer 3 Metal container 4a, 4b, 4c Ground contact portion (fixed contact portion) 5a, 5b, 5c Ground blade (movable contact portion) 6 Insulating rod 7 Operating device 9 Insulation Plates 10a, 10b, 10c Ground conductor 11 Insulation terminal 12 Opening 13 Cover plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kofu Yasugahira 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture F-term (reference) 5G017 BB02 BB03

Claims (7)

[Claims] 1. A main circuit conductor is insulated and supported by a metal container,
In the gas insulated grounding switch provided with a movable contact portion that can be brought into contact with and separated from the fixed contact portion on the main circuit conductor, the fixed contact portion is insulated and supported by the metal container with a ground conductor and an insulating terminal. And a gas-insulated grounding switch insulated from the metal container and drawn out to the outside. 2. The gas insulated grounding switch according to claim 1, wherein the insulating terminal is formed by embedding a three-phase conductor in one insulator. 3. The gas insulated grounding switch according to claim 1, wherein the insulated terminal and the three-phase fixed-side contact portion are arranged in a straight line. 4. The gas-insulated grounding switch according to claim 1, wherein the three-phase fixed-side contact portions and the outer dimensions of the grounding conductor for supporting and fixing the three-side fixed contact portions can be inserted into an opening provided in the metal container. A gas-insulated grounding switch formed in a size. 5. The gas-insulated grounding switch according to claim 3, wherein a position for supporting and fixing the insulating terminal to the metal container is a mounting position of an operating device for driving a movable contact portion in a circumferential direction of the metal container. A gas-insulated grounding switch characterized by being on the opposite side of the above. 6. The gas insulated grounding switch according to claim 3, wherein the insulating terminal and the operating device for driving the movable contact portion are supported and fixed on the same side in the circumferential direction of the metal container. Ground switch. 7. The gas-insulated grounding switch according to claim 1, wherein grounding conductors connected to two phases close to the insulating terminal are formed in an L-shaped cross section, and these grounding conductors are rotated by 90 ° with respect to each other. A gas-insulated grounding switch, wherein the switch is disposed in a gas-insulated grounding switch.