JP4762047B2 - Switchgear - Google Patents

Description

  The present invention relates to a switchgear used for power transmission / distribution and power reception equipment.

  As a conventional technique for realizing downsizing and cost reduction by devising the arrangement of a switch gear composed of a plurality of units such as a power receiving unit and a transformer unit, for example, a bus container for storing a bus is used. It shall have an opening through which the busbar can be drawn out on the five sides, the busbar BUS is pulled out in the left-right direction of the busbar container, a transformer unit is arranged above the busbar container, a power receiving unit is arranged below, and a rearward opening A gas-insulated switch in which other containers, busbar containers, and the like can be arranged in the section is disclosed (for example, see Patent Document 1).

JP 2004-215392 A (page 4, FIG. 6)

In the conventional gas-insulated switchgear shown in Patent Document 1, a bus container is disposed at the center in the vertical direction, and a unit container that houses a disconnector, a circuit breaker, a grounding switch, and the like above and below the bus container. Since it is arranged and configured as one unit, the installation area can be reduced. However, since the disconnecting switch, grounding switch, and circuit breaker are arranged in the vertical direction above and below the bus housed in the central bus container, the vertical direction becomes longer, so the overall height There was a problem that it became high.
In addition, when the device is not attached to the rear side of the busbar container, the space on the rear side of the busbar container cannot be used effectively, and the overall integration efficiency cannot be improved, so there is a problem that downsizing of the switchgear is limited. there were.

  The present invention has been made to solve the above problems, and an object of the present invention is to obtain a switchgear that can reduce the size of the container by reducing the size of the container.

  The switchgear according to the present invention includes a sealed container in which an insulating gas is sealed and a main circuit device is stored. In the segmented switchgear, a busbar connected to the main circuit device is disposed outside the central portion of the rear surface of the busbar connection chamber, and the busbar connection chamber has an indoor side of a mounting plate attached to the front opening. Two three-position disconnectors having three stop positions of on-off-grounding are attached symmetrically in the vertical direction, and the fixed-side terminal of the upper three-position disconnector and the upper equipment room The main circuit device, the fixed terminal of the three-position disconnector located below, and the main circuit device in the lower device chamber are connected to each other through a partition bushing penetrating through a partition wall that partitions each chamber. Connected to each input terminal of both three-position disconnectors The wire is connected through a bus bushing provided through the wall on the back side of the bus connection room, and each grounding terminal of both three-position disconnectors is an insulated terminal provided through the mounting plate. Is connected to.

According to the switchgear of the present invention, the upper equipment room, the busbar connection room, and the lower equipment room are arranged in the vertical direction, the busbars are arranged outside the central portion of the rear surface of the busbar connection room, and inside the busbar connection room. Two 3-position disconnectors are arranged symmetrically in the vertical direction, and the main circuit equipment in the upper equipment room and the main circuit equipment in the lower equipment room are connected to the bus line via each three-position disconnector. So
When the main circuit devices housed in the two device rooms are connected to a common bus, the height of the bus connection chamber can be reduced and the size can be reduced without increasing the installation area. For this reason, it is possible to reduce the thickness of the constituent members of the busbar connection chamber in which the insulating gas is pressurized and sealed, and to reduce the reinforcing members. Therefore, the entire switch gear can be reduced in size and weight, and the cost can be reduced.

Embodiment 1 FIG.
Hereinafter, a switchgear according to the present invention will be described with reference to the drawings.
1 is a side sectional view of a switchgear according to Embodiment 1. FIG. FIG. 2 is a single-line diagram showing an example of a power receiving facility to which the switch gear as shown in FIG. 1 is applied.
First, the configuration of the switch gear will be described with reference to FIG. One block divided by a dotted line in FIG. 2 represents one surface of the switch gear, and usually a plurality of switch gears are arranged in a row. In the leftmost block, power is received by two lines from the top and bottom of the figure. From the cable, the earthing switch ES, the disconnecting switch with grounding switch (3-position disconnecting switch) DS / ES, the circuit breaker CB, and the earthing switch The two lines are connected to a common bus at the center through the switch / breaker DS / ES, and connected to the adjacent switchgear transaction transformer VCT.
The present invention is for efficiently storing a main circuit device for two lines and a common connection bus as described above in a single switchgear, and in particular, a bus, a disconnector connected to the bus, and a ground switch. The arrangement of the vessel is devised.

Next, a specific configuration will be described with reference to FIG.
In the figure, the switch gear 1 includes a sealed container 3 in which a main circuit device is accommodated inside a housing 2. The sealed container 3 is filled with an insulating gas such as SF6, dry air, nitrogen, carbon dioxide. The inside of the sealed container 3 is divided into an upper device chamber 3a, a busbar connection chamber 3b, and a lower device chamber 3c in an airtight manner in the vertical direction. A bus 4 connected to the main circuit device is arranged in a direction perpendicular to the paper surface outside the central portion of the rear surface of the bus connecting chamber 3b. In the case of a three-phase bus, the three phases are arranged in one row up and down as shown.

  The upper device chamber 3 a has an opening on the front surface, and the opening is airtightly closed by the mounting plate 5. An insulating cylinder 7 housing the circuit breaker 6 is attached to the back side of the mounting plate 5, and a circuit breaker operating mechanism 8 is attached to the front side. The movable side of the circuit breaker 6 and the circuit breaker operating mechanism 8 are connected by an operation shaft 9 provided so as to penetrate the mounting plate 5 in an airtight manner, and the circuit breaker 6 is opened and closed by a drive operation of the circuit breaker operating mechanism 8. It is like that.

A cable bushing 10a is attached to the wall surface on the back of the upper device room 3a. The indoor side of the cable bushing 10a is connected to the fixed terminal of the circuit breaker 6 by a connecting conductor, and the cable head of the power cable 11 drawn from the floor surface side of the housing 2 is connected to the outdoor side. Further, a through-type current transformer 13 is provided through the outdoor portion of the cable bushing 10a.
The movable terminal of the circuit breaker 6 is connected via a flexible conductor and a connecting conductor to a partition bushing 14 that penetrates a partition wall that separates the upper device chamber 3a and the busbar connection chamber 3b and keeps both chambers airtight. Has been.

  Similarly to the upper equipment room 3a, the lower equipment room 3c is provided with a circuit breaker 6 in the room, a circuit breaker operating mechanism 8 is provided on the front side, and a cable bushing 10c is provided on the back side. A current transformer 13 is provided through the outside of the cable bushing 10c, and a cable head of the power cable 12 is connected thereto. The fixed terminal of the circuit breaker 6 is connected to the indoor side end of the cable bushing 10c, and the movable terminal is connected to the section bushing 14.

The main circuit device housed in the upper device chamber 3a and the lower device chamber 3c is shown by way of example only in the circuit breaker 6 in the figure, but as described in the connection diagram of FIG. 2, in addition to the circuit breaker, When the earthing switch ES and the 3-position disconnector DS / ES are accommodated, the inspection disconnecting device, the transformer, and the like are accommodated alone or in various combinations. In addition to being connected to the cable as shown, the main circuit device may be connected to the bus. The storage equipment varies depending on the specifications of the power distribution facility where the switchgear is installed.
The invention of the present embodiment is the structure of the busbar connection chamber 3b that connects the main circuit device and the busbar 4 housed in the upper device chamber 3a and the lower device chamber 3c, and the arrangement of the busbar connection chamber 3b and the busbar 4 Since there is a characteristic in the relationship, further description of the upper device chamber 3a and the lower device chamber 3c will be omitted.

Next, the busbar connection chamber 3b at the center of the sealed container 3 will be described.
The busbar connection chamber 3b has an opening hermetically closed by a detachable mounting plate 15 on the front side, and has three stop positions of on / off / grounding on the indoor side surface of the mounting plate 15. Two three-position disconnectors 16, 17 are attached symmetrically in the vertical direction. The upper three-position disconnector 16 is arranged with the fixed terminal 16a side, which is the rotation center of the blade, facing the partition wall side with the upper device chamber 3a, and the fixed terminal 16a and the incoming terminal 16b are attached to the mounting plate. It is being fixed to the insulation holder 18 which consists of a solid insulator attached to the 15 indoor side. Similarly, the lower three-position disconnector 17 is arranged with the fixed terminal 17a facing the partition wall side with the lower equipment chamber 3c, and the fixed terminal 17a and the incoming terminal 17b are fixed to the insulating holder 19. Has been.
In the case of three phases, three three-position disconnectors 16 and 17 are arranged at intervals with a predetermined insulation distance in the direction perpendicular to the drawing sheet.

The fixed side terminal 16 a of the three-position disconnector 16 is connected to the section bushing 14, and is connected to the movable terminal of the circuit breaker 6 in the upper device chamber 3 a via the section bushing 14.
Similarly, the fixed side terminal 17a of the lower three-position disconnector 17 and the movable terminal of the circuit breaker 6 in the lower equipment chamber 3c are connected via a section bushing 14 provided in the partition wall.

  The blades of the three-position disconnectors 16 and 17 are connected to a three-position disconnector operating mechanism 21 provided on the front side of the mounting plate 15 via an operating shaft 20 having a link mechanism. As a result, the operating shaft 20 is driven in the left-right direction in the figure, and the three-position disconnectors 16 and 17 are operated as on-off-grounding.

Next, the ground side terminals of the three-position disconnectors 16 and 17 will be described.
The ground-side terminal 16c of the upper three-position disconnector 16 is fixed to the indoor side end of three (three-phase) insulated terminals 22 that are airtightly provided through the mounting plate 15 for each phase. ing. The insulation terminal 22 has a center conductor at the center of the cylindrical insulation portion, and its outdoor end is grounded to a ground terminal (not shown).
On the other hand, the ground-side terminal 17c of the lower three-position disconnector 17 is fixed to three insulating support bases 23 provided on the indoor side of the mounting plate 15 for each phase. The ground-side terminal 16c of the upper three-position disconnector 16 and the ground-side terminal 17c of the lower three-position disconnector 17 are connected by a connection conductor 24 for each phase. With such a configuration, the number of insulated terminals can be reduced as compared with the case where the ground-side terminals 16c and 17c of both the three-position disconnectors 16 and 17 are led out to the outside by individual insulated terminals.
Contrary to the figure, the upper ground side terminal 16 c may be fixed to the insulating support base 23, and the lower ground side terminal 17 c may be fixed to the insulating terminal 22.

Next, the back side of the busbar connection chamber 3b will be described.
A bus bushing 25 is provided on the wall surface on the back side of the bus bar connection chamber 3b so as to penetrate the wall surface. FIG. 3 shows the bus bushing 25. In the figure, the bus bushings for three phases are displayed in a line in the vertical direction, but in reality, the three phases are shifted in the direction perpendicular to the paper with approximately the same spacing as the phases of the three-position disconnector. Arranged.
As shown in the figure, the bus bushing 25 includes a center conductor 26 and an insulating portion 27 provided so as to cover the outer periphery of the center conductor 26, and a flange portion 27 a of the insulating portion 27 is provided on the rear surface of the bus connection chamber 3 b. As a fixing means for fixing to the side wall surface, an embedded metal fitting 28 having an internal thread is embedded. The wall surface of the busbar connection chamber 3b is airtightly attached via an O-ring or the like, and the embedded metal fitting 28 is screwed and fixed.

The upper and lower entry terminals 16b, 17b of the three-position disconnectors 16, 17 are connected to each phase by a connection conductor 29, and the connection conductor 29 is connected to the indoor side end of the bus bushing 25 of the corresponding phase. It is connected. The outdoor end of the bus bushing 25 is connected to each phase of the bus 4.
When the bus 4 and the three-position disconnectors 16 and 17 configured in this way are viewed from the bus 4 side, the upper three-position disconnector 16 and the lower three-position disconnector 17 are located above and below the bus 4. The shape is symmetrically arranged.

Although the bus-line connection chamber 3b is configured as described above, another configuration example of the attachment portion of the ground-side terminal of the three-position disconnector is shown in FIG. Since the parts other than the ground side terminal mounting part are the same as those in FIG. 2, the same parts are denoted by the same reference numerals, and the description thereof will be omitted. As shown in the drawing, each contact portion between the ground-side terminal 16c of the upper three-position disconnector 16 and the ground-side terminal 17c of the lower three-position disconnector 17 has a rigid conductor portion 30 for each phase. The central portion of the conductor portion 30 is fixed to the indoor side end portion of the insulating terminal 22 provided for each phase at the approximate center of both the three-position disconnectors 16 and 17 of the mounting plate 15. It is what. That is, as compared with FIG. 2, the insulating support base 23 and the connection conductor 24 are omitted.
With this configuration, the distance between the two three-position disconnectors 16 and 17 can be reduced as compared with the case of FIG.

When a plurality of switch gears are arranged in a row, bus bar bushings protruding rearward from the bus bar connection chamber of each switch gear are connected and connected by bus bar 4.
The three-position disconnectors 16 and 17 can also be used as disconnectors or ground switches by using only the disconnector function side or the ground switch function side.

As described above, according to the switchgear of the present embodiment, the upper device chamber, the busbar connection chamber, and the lower device chamber of the sealed container are arranged in the vertical direction, and the busbar is disposed outside the central portion of the rear surface of the busbar connection chamber. Two three-position disconnectors are arranged symmetrically in the vertical direction inside the busbar connection chamber, and the fixed-side terminal of each three-position disconnector is connected to the adjacent equipment room via a section bushing provided on the partition wall. Since it is connected to the main circuit equipment, each incoming terminal is connected to the bus via the bus bushing, and each ground terminal is connected to the insulated terminal.
When connecting the main circuit devices stored in the two device rooms to a common bus, the bus is connected to the bus container as described in Patent Document 1, as compared with the case where the bus and disconnectors are stored side by side in the vertical direction. By providing outside the busbar connection chamber, the height of the busbar connection chamber can be reduced and the size can be reduced. For this reason, since the pressure applied to the container of the busbar connection chamber in which the insulating gas is sealed can be reduced, the thickness of the members constituting the container can be reduced, and the reinforcing members can be reduced. Therefore, the switch gear can be reduced in size and weight, and the cost can be reduced.

  In addition, at the connection between each ground side terminal and insulated terminal of both three position disconnectors, the ground side terminal of each phase of one three position disconnector is fixed to the indoor side end of the insulated terminal provided for each phase. The ground side terminal of each phase of the other 3-position disconnector is fixed to the insulating support provided on the interior side of the mounting plate, and the ground side terminals of both 3-position disconnectors are connected to each phase by connecting conductors. Therefore, the height of the busbar connection chamber can be reduced as compared with the case where the upper and lower ground terminals are connected to individual insulation terminals and led out of the room.

  Moreover, in the connection part of each ground side terminal of both 3 position disconnectors and an insulated terminal, the ground side terminal of both 3 position disconnectors is integrally formed for every phase, and the chamber of the insulated terminal provided for every phase Since it is fixed to the inner end, the distance between the three position disconnectors can be reduced compared to the above, so that the height of the busbar connection chamber can be further reduced and the switchgear can be made smaller. it can.

  Furthermore, since the bus bushing is configured to include a central conductor that electrically connects the incoming terminal and the bus, an insulating portion that is provided so as to cover the outer periphery of the central conductor, and a fixing means thereof, the bus The distance between each other can be reduced, and the switchgear can be miniaturized.

It is side surface sectional drawing of the switchgear by Embodiment 1 of this invention. It is a single line connection figure which shows an example of the power receiving installation with which the switchgear by Embodiment 1 of this invention is applied. It is a figure which shows the bus-bar bushing of the switchgear by Embodiment 1 of this invention. It is side surface sectional drawing which shows the other example of the bus-bar connection chamber of the switchgear by Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switchgear 2 Case 3 Sealed container 3a Upper equipment room 3b Busbar connection room 3c Lower equipment room 4 Busbars 5,15 Mounting plate 6 Circuit breaker 7 Insulating cylinder 8 Circuit breaker operation mechanism 9,20 Operation shaft 10a, 10c Cable bushing DESCRIPTION OF SYMBOLS 11, 12 Power cable 13 Current transformer 14 Section bushing 16, 17 3 position disconnector 16a, 17a Fixed side terminal 16b, 17b Incoming side terminal 16c, 17c Ground side terminal 18, 19 Insulation holder 21 3 Position disconnector operation mechanism 22 Insulation terminal 23 Insulation support base 24 Connection conductor 25 Bus bar bushing 26 Center conductor 27 Insulation part 27a Flange part 28 Embedded bracket (fixing means)
29 Connection conductor 30 Conductor part.

Claims (4)

In a switchgear comprising an airtight container in which an insulating gas is enclosed and in which a main circuit device is accommodated, and the inside of the airtight container is divided into an upper device room, a busbar connection chamber, and a lower device room in an airtight manner in the vertical direction,
A bus connected to the main circuit device is disposed outside the central portion of the rear surface of the bus connection chamber,
In the bus connection room, two three-position disconnectors having three stop positions of on / off / ground symmetrically in the vertical direction on the room-side surface of the mounting plate attached to the opening on the front side The fixed side terminal of the three-position disconnector located on the upper side and the main circuit device in the upper equipment room, and the fixed terminal of the three-position disconnector located on the lower side and the lower equipment room The main circuit device is connected to each other through a partition bushing penetrating through a partition wall that divides each of the chambers, and each entry terminal of the three-position disconnector and the bus are connected to the bus connection chamber. Connected to each other through a bus bushing provided through the rear wall, and each grounding terminal of each of the three-position disconnectors is connected to an insulating terminal provided through the mounting plate. A switchgear characterized by that.   2. The switchgear according to claim 1, wherein the ground-side terminal of each phase of one of the three-position disconnectors is provided for each phase in the connection portion between each ground-side terminal of each of the three-position disconnectors and the insulated terminal. The ground terminal of each phase of the other three-position disconnector is fixed to an insulating support provided on the interior side of the mounting plate, and the both three-position disconnectors are fixed to the indoor end of the insulated terminal. A switchgear characterized in that the ground side terminals are connected to each other by a connection conductor for each phase.   The switchgear according to claim 1, wherein the ground-side terminals of the three-position disconnectors are integrally formed for each phase in the connection portion between the ground-side terminals of the three-position disconnectors and the insulation terminal. A switchgear, wherein the switchgear is fixed to an indoor side end portion of the insulated terminal provided for each phase.   4. The switchgear according to claim 1, wherein the bus bushing covers a center conductor that electrically connects the entry-side terminal and the busbar and an outer periphery of the center conductor. And a fixing means for fixing the insulating part to the rear side wall surface of the bus bar connecting chamber.

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