JP2003125505A - Gas insulated disconnecting switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductor arrangement better suited for miniaturization, without deteriorating the insulation characteristics related to requirement for further miniaturization of the gas insulated disconnecting switch, although isosceles triangular arrangement and equilateral triangular arrangement are mainly adopted for conductor arrangement in a grounding tank, in a gas insulated disconnecting switch of three-phase package type. SOLUTION: The internal conductor of an insulating spacer adopts an equilateral triangular arrangement, with the arrangement of a conductive part in an internal equipment unit of the gas insulated disconnecting switch adopting the isosceles triangular arrangement, and connecting both the arrangements by a conductor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated disconnector, and more particularly to a three-phase collective type gas-insulated disconnector connected to a gas-insulated busbar.

[0002]

2. Description of the Related Art In an electric power system equipped with power transmission and transformation equipment, a gas insulation disconnector has been widely used in recent years for the purpose of downsizing of equipment and improvement of insulation reliability. The gas insulation disconnector is designed to insulate by pressurizing and enclosing an inert insulation gas such as SF6 gas in a metal grounding tank together with the main body of the equipment. There are various components such as gas-insulated busbars, gas-insulated circuit breakers, and gas-insulated disconnectors as the component elements that make up the gas-insulated disconnector, and these components are connected via an insulating spacer according to a prescribed bus-bar connection method. A gas insulation disconnector is constructed by connecting and assembling.

The gas insulation disconnecting switch is not only one in which the equipment main body is housed in the grounding tank for each phase, but also a three-phase collective type gas insulation disconnecting disconnection device in which the equipment main body is housed in the grounding tank collectively in three phases. is there. Among them, a conventional three-phase collective type gas insulated disconnector provided at a branch connection portion between a gas insulated busbar and a branch line will be described with reference to FIG.

A cylindrical movable side contact portion 3 inside a grounded tank 1 containing an insulating gas, and a movable contactor which moves in the movable side contact portion 3 while maintaining electrical contact with the movable side contact portion 3. 4 and a fixed contactor 2 that faces the movable contactor 4 and contacts and separates from the movable contactor 4. The movable contact portion 3 is a conductor 7
a, 7b and the inner conductor 20 of the insulating spacers 6a, 6b
It is electrically connected to a gas-insulated bus bar (not shown) installed adjacent to the ground tank 1 via a and 20b. Further, the fixed contactor 2 includes the conductor 14 and the inner conductor 20c of the insulating spacer 6c.
It is electrically connected to a gas insulation circuit breaker (not shown) installed adjacent to the grounding tank 1 or a gas insulation bus bar connected to the gas insulation circuit breaker via the. The insulating spacer 6 is provided in the ground tank 1.
It is sealed by a, 6b and 6c.

Here, in the case of the conventional three-phase batch type gas insulation disconnecting switch, as shown in FIG. 3B, the conductor is bridged, the insulation distance is secured at the intersection, and the insulation structure is arranged and assembled. For the sake of simplicity, the conductors 7a, 7b, 1 connected to the inner conductors 20a, 20b of the insulating spacer, the movable side contact portion 3, and the fixed contactor 2 are used.
In each case, three conductors were arranged in an isosceles triangle. Further, the disconnector contact portion is also arranged in an isosceles triangular arrangement.

FIG. 4 schematically shows an intersection of conductors in a general isosceles triangle arrangement. The minimum interphase insulation distance 15 between the conductors 18a, 18b, 18c arranged in an isosceles triangle,
The distance between the conductors 18a, 18b, 18c and the ground tank 1,
That is, the tank diameter design dimension 17a of the grounded tank 1 is determined by the insulation distance 16 from the ground.

On the other hand, an equilateral triangular arrangement is also considered as a conductor arrangement of the three-phase batch type gas insulation disconnecting switch. FIG. 5 schematically shows a crossing portion of conductors in a case of arranging a general equilateral triangle. The required distance of insulation 15 is ensured by deforming the conductor's strut and intersection so that the portion of the conductor approaching other conductors is recessed, thereby ensuring the insulation distance at the straight portion of the conductor. The ground tank diameter 17b is smaller than the ground tank diameter 17a in the isosceles triangle arrangement.
Can be shortened for compactness. In general, such an equilateral triangle arrangement is applied to a long busbar portion or the like.

[0008]

In recent years, the landing space has been restricted due to difficulty in land acquisition, and this has led to a demand for further downsizing of the gas-insulated disconnecting switch. However, in the case of the three-phase collective type gas insulated disconnecting switch shown in FIG. 3, since the movable contactor 4 moves in the movable side contact portion 3 which is also a conductor, the movable side contact portion which is a conductor. 3 cannot be recessed too much as shown in FIG. Therefore, in order to secure a sufficient insulation distance at the contact portion, the isosceles triangle arrangement must be adopted as the arrangement, and accordingly, the conductors 7a, 7b, 14 and the insulating spacers 6a, 6b, 6 are arranged.
The internal conductors 20a, 20b, 20c of c are also arranged in an isosceles triangle, and as a result, the tank diameter of the adjacent device also becomes large, and as a result, there is a limit to downsizing the gas insulation disconnector. An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a gas-insulated disconnector in which the size of the gas-insulated switchgear is further reduced.

[0009]

According to a first aspect of the present invention, there is provided a gas-insulated disconnecting switch, the grounding tank containing an insulating gas, the main body of an internal device housed in the grounding tank, and the inside of the grounding tank. A three-phase collective type gas insulated disconnector comprising a conductive part of a device body and an insulating spacer having an inner conductor for connecting the conductive part to another gas-insulated device installed adjacent to the ground tank, wherein the internal device The conductive portion is arranged in an isosceles triangle, and the inner conductor of the insulating spacer is arranged in an equilateral triangle.

According to the present invention, the conductive parts of the internal equipment are arranged in an isosceles triangle arrangement and the insulation distance is maintained, while the inner conductors of the insulating spacers are arranged in an equilateral triangle construction so that adjacent equipment can be made compact. Therefore, it is possible to reduce the size of the gas insulation disconnector.

The invention of a gas-insulated disconnector according to claim 2 of the present invention is directed to a grounding tank filled with an insulating gas, a movable-side contact portion of the disconnector provided in the grounding tank, and this movable-side contact. A movable contact that moves while maintaining electrical contact with a fixed part, a fixed contact that faces the movable contact and contacts and separates from the movable contact, and the grounding tank and other internal equipment installed adjacent to this. In a three-phase batch type gas insulation disconnector which is composed of an insulating spacer that is connected to a gas insulation device and has an internal conductor, and a conductor that connects the fixed side contact portion or the movable contact and the internal conductor of the insulating spacer, , The contact part of each phase consisting of fixed contacts is an isosceles triangle arrangement,
The inner conductors of the insulating spacer are arranged in an equilateral triangle.

According to the present invention, the contact portion of the disconnecting switch is arranged in an isosceles triangle arrangement and the insulation distance is maintained, and the inner conductor of the insulating spacer is arranged in an equilateral triangle arrangement so that adjacent equipment can be made compact. Therefore, it is possible to reduce the size of the gas insulation disconnector.

According to a third aspect of the present invention, there is provided a gas insulated disconnector according to the second aspect, wherein the movable side contact portion, the movable side contact portion, and the inner conductor of the insulating spacer are provided. The connecting conductor is integrated with the movable contact. According to the present invention, since the movable contact portion and the conductor are integrated, the high electric field portion of the mounting portion is eliminated, the insulation reliability is improved, and the number of parts is reduced.

According to a fourth aspect of the present invention, in the gas insulated disconnector of the present invention, in the gas insulated disconnector according to the second aspect, the shield diameter of the movable contact portion is larger than the shield diameter of the fixed contact. Characterized by being small.

According to the present invention, in view of the insulation design of the contact portion of the disconnector, the movable side of the fixed contact has a large shield diameter which greatly affects the insulation characteristic against the re-ignition arc when the forward small current is interrupted. The shield diameter of the contact portion can be reduced.

According to a fifth aspect of the present invention, there is provided the gas insulated disconnector according to the second aspect, wherein the opening / closing mechanism for driving the movable contact comprises a movable side contact portion and an insulating spacer. It is characterized in that it is provided in the grounding tank on the bottom side of the isosceles triangular arrangement of the conductors connecting to the internal conductors. According to the present invention, since the opening / closing mechanism is provided on the bottom side of the isosceles triangle arrangement of the conductors in the ground tank, the space becomes large, so that the opening / closing mechanism can be made compact.

According to a sixth aspect of the present invention, there is provided the gas insulated disconnecting switch according to the second aspect, wherein the insulating spacer is a cone-shaped spacer, and the convex side of the insulating spacer faces the adjacent device side. It is characterized in that it is configured in.

According to the present invention, the gas space in the grounded tank can be made large, so that the heat capacity can be increased and the temperature rise at the time of passing a steady current can be suppressed, and the conductor between each contact portion and the spacer can be suppressed. You can also secure a space to transform the.

According to a seventh aspect of the present invention, there is provided a gas-insulated disconnecting switch according to the second aspect, wherein in the gas-insulating disconnecting switch according to the second aspect, the conductor connecting the movable side contact portion or the fixed side contactor and the insulating spacer is an isosceles side. It is characterized in that the fixed side contact part of the grounding switch is provided on the conductor on the bottom side in a triangular arrangement, and the movable side contacting part of the grounding switch is housed in the same grounding tank. According to the present invention, the movable contact portion of the ground switch or the fixed contact can be provided in a large space on the bottom side opposite to the apex of the isosceles triangle.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a gas insulation disconnector according to the present invention will be described below with reference to the drawings. Figure 1
[FIG. 3] is a cross-sectional view showing the first embodiment of the present invention and is a view showing a case where the present invention is applied to a gas insulation disconnector. Cylindrical movable side contact part 3 inside grounding tank 1 containing insulating gas
And a finger-shaped movable contactor 4 that moves in the cylinder of the movable side contact part 3 while maintaining electrical contact with the movable side contact part 3, and a fixed contact that faces the movable contactor 4 and is separated from it. The child 2 is provided for three phases. The movable-side contact portion 3 is the inner conductor 2 of the conductors 7a and 7b and the insulating spacers 6a and 6b.
It is connected to a gas-insulated bus bar (not shown) installed adjacent to the ground tank 1 via 0a and 20b. Further, the fixed contactor 2 is connected via the conductor 14 and the inner conductor 20c of the insulating spacer 6c to a gas insulation breaker (not shown) that is also adjacently installed, or a gas insulation busbar connected to the same. 8 is a shield for the movable side contact portion, 9 is a shield for the fixed contact 2,
10 open / close mechanism.

In such a gas insulation disconnector, the inner conductors 20a, 20b of the insulation spacers 6a, 6b, 6c,
20c is provided on the insulating spacers 6a, 6b, 6c in an equilateral triangular arrangement as shown in FIG. 1 (b), and the contact portions are arranged in an isosceles triangular arrangement as shown in FIG. 1 (c).

Therefore, the conductors 7a and 7b connecting the movable contact portion 3 and the internal conductors 20a and 20b of the insulating spacers 6a and 6b, and the fixed contact 2 and the insulating spacer 6c.
Most of the conductors 14 connecting the inner conductors 20c are arranged in an isosceles triangle, but the insulating spacers 6a, 6b, 6c are arranged.
The portion that is closer to is curved and formed so as to form an equilateral triangle arrangement. The conductor 7b connecting the movable contact portion 3 and the inner conductor 20b of the insulating spacer 6b is the movable contact portion 3b.
The diameter of the shield 8 of the movable contact portion 3 is smaller than the diameter of the shield 9 of the fixed contact 2.

An opening / closing mechanism 10 for driving the movable contactor 4 of the disconnector is provided in the lower portion of the ground tank 1.
The conductors 7a and 7b connecting the movable contact portion 3 and the insulating spacers 6a and 6b are arranged in an isosceles triangle having an apex on the insulating spacer 6c side so that the distance to the opening / closing mechanism 10 becomes large. A finger-shaped spacer connecting portion 11 is provided at a connecting portion between the conductor 7a and the insulating spacer 6a, and the movable-side contact portion 3 is arranged in an isosceles triangle having a vertex on the insulating spacer 6b side in plan view. . As a result, the conductor 14 that connects the fixed contact 2 and the internal conductor 20C of the insulating spacer 6c is also arranged in an isosceles triangle having an apex on the insulating spacer 6b side. Further, the fixed side contact portion 12 of the ground switch is provided on the bottom side of the triangular arrangement of the conductor 14,
The movable side contact portion 13 of the earthing switch is housed in the same earthing tank 1 as the disconnector, and the movable contactor 19 of the earthing switch 19 is provided.
Is a blade type.

According to the first embodiment of the present invention as described above, since the contact portion composed of the fixed contact 2 and the movable side contact portion 3 is arranged in an isosceles triangle, the interphase insulation distance is sufficiently maintained. be able to. Insulating spacers 6a, 6b, 6
Since the internal conductors 20a, 20b, 20c of c are arranged in an equilateral triangle, the conductors of the equipment adjacent to the gas-insulated busbar can also be arranged in an equilateral triangle, which can be compactly constructed and the gas-insulated disconnector can be downsized. You can

The conventional movable contact portion 3 and the conductors 7a, 7
The mounting part of b was a high electric field part and sometimes became the weakest point part on insulation, but since the movable side contact part 3 and the conductors 7a and 7b were integrated, the number of parts was reduced and the high electric field part of the mounting part was eliminated. Insulation reliability can be improved.

The fixed contactor 2 and the movable side contact portion 3 must be designed to be insulated so that there is no ground fault due to the re-ignition arc when the disconnector is advanced and the small current is interrupted in addition to the electrostatic field. Since the diameter of the shield portion of the fixed contactor 2 is more effective than the diameter of the shield 8 of the movable contact portion 3, the diameter of the movable shield 8 should be smaller than that of the fixed shield 9. You can Therefore, the movable contact portion 3 can be made small and lightweight. In addition, the movable side contact portion 3
It becomes easier to secure the inter-phase insulation distance and the disconnector can be configured compactly. The conductors 7a and 7b connecting the movable side contact portion 3 and the insulating spacers 6a and 6b are provided with the opening / closing mechanism 10
Since it is connected to the movable side contact portion 3 in an isosceles triangle arrangement such that the distance between the opening and closing mechanism portion 10 in the grounding tank 1 is large, the insulation distance from the opening and closing mechanism portion 10 is increased. Easy to take and insulation strength is improved.

In addition, the movable side contact portion 3 has an insulating spacer 6b.
Since they are arranged in an isosceles triangle having a vertex on the side, the length of the conductor between the movable-side contact portion 3 and the spacer connecting portion 11 can be made large. The spacer contact portion 11 has a finger-like fitting contact, and the conductor 7a has a structure to be inserted into the contact portion 11, and it is necessary to secure a straight portion for that portion, and since the conductor length of that portion can be made large, a ground tank The conductors 7a and 7b and the movable side contact portion 3 can be efficiently provided in the unit 1, and the disconnector can be made compact.

When the grounding switch is provided in the grounding tank 1 of the disconnector, the movable contact portion 13 of the grounding switch can be provided in a large space on the bottom side opposite to the apex of the isosceles triangle, which is compact. It is possible to provide a disconnecting switch with a grounding switch. When the movable contactor 19 of the earthing switch is structured to open and close between the contact portions 12 and 13 by the linear movement, the opening / closing mechanism of the earthing switch is enlarged by the amount of the linear movement, branching to the earthing tank 1 or a separate case or the like. However, the movable contact 19 of the grounding switch is made into a blade type that rotates from the movable side contact part 13 to enter and leave the fixed side contact part 12, thereby opening and closing the grounding switch. The mechanism portion can be downsized, and the movable side contact portion 13 of the grounding switch can be arranged without the need to provide a branch or a separate case in the grounding tank 1.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a sectional view showing a second embodiment of the present invention. A cylindrical movable side contact part 3 in a grounding tank 1 in which an insulating gas is sealed, and a finger-shaped movable contactor that moves in the cylinder of the movable side contact part 3 while maintaining electrical contact with the movable side contact part 3. 4 and a fixed contactor 2 that faces the movable contactor 4 and contacts and separates from the movable contactor 4. The movable contact portion 3 is connected to a gas-insulated bus bar (not shown) adjacent to the ground tank 1 via the conductor 7a and the inner conductor 20a of the cone-shaped insulating spacer 6a. Further, the fixed contactor 2 is connected via a conductor 14 and an inner conductor 20c of the insulating spacer 6c to a gas insulation breaker (not shown) installed adjacent to the ground tank 1 or a gas insulation busbar connected thereto.

In such a gas insulation disconnector, the inner conductors of the insulating spacers 6a and 6c are provided in the insulating spacers 6a and 6c in an equilateral triangle arrangement as shown in FIG. 2 (b).
As shown in FIG. 2C, the contact portion on the disconnector side is arranged in an isosceles triangle arrangement. A conductor 7a connecting the movable side contact portion 3 and the inner conductor 20a of the insulating spacer 6a.
Is integrated with the movable-side contact portion 3, and the diameter of the shield 8 of the movable-side contact portion 3 is smaller than the diameter of the shield 9 of the fixed contactor 2. Further, an opening / closing mechanism 10 for driving the movable contact 4 is provided in the lower portion of the ground tank 1, and the movable side contact portion 3 and the inner conductor 20 of the insulating spacer 6a are provided.
The conductor 7a connected to a is connected to the movable contact portion 3 in an isosceles triangular arrangement having an apex on the insulating spacer 6c side so that the distance to the opening / closing mechanism 10 becomes large.

Further, the insulating spacer 6c is constructed so that the cone-shaped convex surface side faces the adjacent device side, that is, the outside of the ground tank 1. Furthermore, the movable side contact portion 3, the fixed contact 2, and the inner conductors 20a of the insulating spacers 6a and 6c,
The conductors 7a and 14 connecting to 20c are arranged in an isosceles triangle, and the fixed side contact portions 12 and 15 of the ground switch are provided on the conductors 7a and 14, respectively, and the movable side contact portion 1 of the ground switch 1 is provided.
3 and 16 are housed in the same grounding tank 1 as the disconnecting switch, and the movable contactor 19 of the grounding switch of the movable side contact portion 13 is a blade type.

According to the second embodiment of the present invention as described above, in addition to the function and effect obtained in the first embodiment, the disconnection is achieved by making the adjacent device side of the insulating spacer 6c the convex side. Since the gas space in the vessel can be made large, the heat capacity can be increased and the temperature rise can be suppressed when a steady current is applied. Further, a space for deforming the conductor 14 between the fixed contactor 2 and the insulating spacer 6c can be secured, and the gas insulating disconnector can be configured compactly. Further, when the grounding switch is provided in the grounding tank 1 of the disconnector, the movable contact portions 13, 16 of the grounding switch are provided in a large space on the bottom side opposite to the apex of the isosceles triangle of the conductors 7a, 14. It is possible to provide a compact disconnecting switch with a grounding switch. When the movable contactor 19 of the earthing switch is structured to open and close between the contact portions 12 and 13 by the linear movement, the opening / closing mechanism of the earthing switch is enlarged by the amount of the linear movement, branching to the earthing tank 1 or a separate case or the like. However, the movable contact 19 of the grounding switch is made into a blade type that rotates from the movable side contact part 13 to enter and leave the fixed side contact part 12, thereby opening and closing the grounding switch. The mechanism portion can be downsized, and the movable side contact portion 13 of the grounding switch can be arranged without the need to provide a branch or a separate case in the grounding tank 1.

[0033]

As described above, according to the present invention, the grounding tank filled with the insulating gas, the main body of the internal equipment housed in the grounding tank, the conductive part of the main body of the internal equipment, and the conductive part. In a three-phase batch type gas insulated disconnector consisting of an insulating spacer having an inner conductor connected to another gas-insulated device installed adjacent to the ground tank, the conductive part of the internal device is an isosceles triangle arrangement, Since the inner conductors of the insulating spacers are arranged in an equilateral triangle, it is possible to provide a gas-insulated disconnector which further reduces the size of the gas-insulated switchgear.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a gas insulation disconnector according to a first embodiment of the present invention, in which (a) is a cross-sectional view, (b), (c).
Is a diagram schematically showing a conductor intersection, and (b) is FIG. 1 (a).
Is a view seen in the directions of arrows A, B, and C, and (c) is a view obtained by cutting FIG. 1 (a) along the lines DD and EE and looking in the directions of the arrows, respectively.

FIG. 2 is a diagram showing a configuration of a gas insulation disconnector according to a second embodiment of the present invention, in which (a) is a cross-sectional view, (b), (c).
Is a diagram schematically showing a conductor intersection, and (b) is FIG. 1 (a).
In the direction of arrows A and B, (c) is C- of FIG. 1 (a).
The figure which cut | disconnected along the C line and the D-D line, and each saw in the arrow direction.

FIG. 3 is a diagram showing a configuration of a conventional gas insulated disconnector,
1A is a cross-sectional view, FIG. 1B is a diagram schematically showing conductor crossing portions, and FIG. 1A is a diagram viewed in the directions of arrows A and B.

FIG. 4 is a diagram schematically showing a conductor orthogonal portion of a conventional isosceles triangle arrangement.

FIG. 5 is a view schematically showing a conventional conductor orthogonal portion arranged in an equilateral triangle.

[Explanation of symbols]

1 ... Ground tank, 2 ... Fixed contact, 3 ... Movable side contact part,
4 ... Movable contactor, 6a, 6b, 6c ... Insulating spacer, 7
a, 7b ... conductor, 8, 9 ... shield, 10 ... opening / closing mechanism section, 11 ... spacer connecting section, 14 ... conductor.

Claims (7)

[Claims] 1. A grounding tank filled with an insulating gas, an internal equipment main body housed in the grounding tank, a conductive part of the internal equipment main body, and another electrically conductive part installed adjacent to the grounding tank. In a three-phase batch type gas insulated disconnector consisting of an insulating spacer having an internal conductor connected to a gas-insulated device, the conductive part of the internal device is arranged in an isosceles triangle, and the internal conductor of the insulating spacer is arranged in an equilateral triangle. A gas-insulated disconnecting switch characterized by the above. 2. A grounding tank filled with an insulating gas, a movable side contact part of a disconnector provided in the grounding tank, and a movable contactor that moves while maintaining electrical contact with the movable side contact part. A fixed contact facing the movable contact and coming in contact with and separated from the movable contact; an insulating spacer having an inner conductor for connecting the ground tank and the internal device to another gas-insulated device installed adjacent thereto; In the three-phase batch type gas insulated disconnector consisting of the fixed side contact part or the conductor connecting the movable contactor and the inner conductor of the insulating spacer,
A gas-insulated disconnecting switch characterized in that the contact portion of each phase composed of a fixed contact is arranged in an isosceles triangle, and the arrangement of the inner conductor of the insulating spacer is arranged in an equilateral triangle. 3. The gas-insulated disconnector according to claim 2, wherein the movable contact portion and a conductor connecting the movable contact portion and the inner conductor of the insulating spacer are integrated with the movable contact portion. . 4. The gas insulated disconnector according to claim 2, wherein the diameter of the shield of the movable contact portion is smaller than the diameter of the shield of the fixed contact. 5. An opening / closing mechanism for driving the movable contact is provided in a grounding tank on the bottom side of an isosceles triangular arrangement of a conductor connecting a movable side contact portion and an inner conductor of an insulating spacer. The gas insulated disconnecting switch according to claim 2, which is characterized in that. 6. The insulating spacer is a cone-shaped spacer,
The gas insulation disconnector according to claim 1 or 2, wherein the convex surface side is configured to face the adjacent device side. 7. The conductor for connecting the movable side contact portion or the fixed side contactor and the insulating spacer is arranged in an isosceles triangle, and the conductor is provided with a fixed side contact portion of a ground switch on the bottom side thereof.
The gas-insulated disconnecting switch according to claim 1, wherein the movable-side contact portion of the earthing switch is housed in the same earthing tank.