JPH07231524A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To provide a GIS comprising power supply side buses and load side buses arranged vertically in parallel on the same side of a VCT in which the connection bus in each connection duct is arranged rationally. CONSTITUTION:In a GIS where power supply side buses 21 and load side buses 22 are arranged vertically in parallel on the same side of a VCT 1, a bus connection duct 28 is disposed between the VCT and both buses. A VCT connection duct 29 connecting the bus connection duct and the VCT is disposed above the VCT and a bus being connected reciprocally with the current transformer of the VCT is constituted of a coaxial bus 31, 34, 39 in each connection duct. Since a coaxial bus is employed, arrangement of the connection bus can be rationalized and the required space can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear (hereinafter referred to as "GIS") provided with a transformer for electric power supply and demand meters (hereinafter referred to as "VCT").

[0002]

2. Description of the Related Art In GIS equipped with VCT, a GIS in which the busbars are laid out in a rational manner has already been proposed (Japanese Patent Application No. 3-198466). The outline of this GIS will be described with reference to the drawings. 6 is a single line connection diagram of GIS, FIG. 7 is a plan view of GIS, FIG. 8 is a front view, and FIG. 9 is a side view seen from the line S--S of FIG.

Each of the two power receiving units 2 including the bushing 3, the disconnector 4, the circuit breaker 5, and the disconnector 4 is VC
It is arranged on both sides of T1 and is connected to VCT1 through the lower pipe line 15. In addition, two systems of transformer units 7 including a transformer 8, a circuit breaker 5, and a disconnector 4 are arranged on both sides of the VCT 1 one by one, and are connected to the VCT 1 through an upper conduit 14. The upper pipe line 14 and the lower pipe line 15 are arranged on the same side of the VCT 1 and vertically in parallel.

In this GIS, the power supply side busbar and the load side busbar are arranged on the same side and vertically in parallel with respect to the VCT1, so that the installation area can be greatly reduced and wasteful space is eliminated. Moreover, the inspection inspection route can be simplified and shortened, and the inspection inspection work can be rationalized.

[0005]

However, the above-mentioned G
In the IS, regarding the connecting busbars between each busbar conduit and the VCT, the connecting busbars of the two phases among the three phases must be routed from the power source side busbar to the load side busbar via the VCT. For this reason, the busbars for two phases of the three phases are arranged to reciprocate in the busbar connecting pipe and the VCT connecting pipe, and the arrangement of the connecting busbars becomes complicated.

According to the present invention, a GI in which a bus bar on the power supply side and a bus bar on the load side are arranged on the same side and vertically above and below the VCT.
In S, the purpose is to rationally arrange the connecting buses in the GIS.

[0007]

In order to achieve the above object, the present invention provides a GIS in which a power supply side busbar and a load side busbar are arranged on the same side of a VCT and in parallel vertically.
A busbar connecting conduit is provided between the VCT and the two busbars,
A VCT connection conduit for connecting between the busbar connection conduit and the VCT is disposed on the VCT, and a busbar that is reciprocally connected to the current transformer of the VCT in each of the connection conduits is a coaxial busbar. It consists of.

[0008]

Since the connecting busbars that are reciprocally arranged from the power source side busbars and the load side busbars to the VCT are configured by coaxial busbars,
Since the connecting busbar has a compact structure and the number of connecting busbars arranged inside each connecting pipeline is reduced, the space inside each connecting pipeline can be reduced.

[0009]

Embodiments of the present invention will be described with reference to the drawings. The overall arrangement of the GIS in this embodiment is shown in FIGS.
Is almost the same as that shown in. 1 is an S-S of FIG.
It is a figure which shows the part seen from the line, and a part of the pipe line is cut away to show the inside. 2 is a diagram showing an outline of the connection relationship in FIG.

Among the bus lines arranged vertically in parallel, the power supply side bus bar 21 is housed in the upper pipe line 14 and the load side bus bar 22 is stored in the lower pipe line 15. Of these bus lines, the lower line 15 has a structure having a disconnector 23. It should be noted that which structure of the bus line 14 or 15 is to be adopted is arbitrary. Each bus 2
1, 22 are introduced into the busbar connecting conduit 28 via the connecting conductors 26, 27 of the insulating spacers 24, 25, respectively.
Two of the three phases of the bus introduced into the bus connecting line 28 are connected from the power supply side bus 21 to the load side bus 22 via the current transformer in the VCT 1. The remaining one phase is branched and connected from the power source side bus 21 to the load side bus 22 and VCT1. The connection between the busbar connecting line 28 and the VCT1 is made through a VCT connecting line 29 arranged above the VCT1.

Bus line connecting line 28 to VCT connecting line 29
Out of the three-phase busbars drawn to the two-phase busbars 31, 32
Is composed of coaxial buses. The remaining one-phase bus bar 33 is composed of a normal bus bar. Further, the connecting busbars in the VCT connecting conduit 29 are also constructed in the same manner, and the two-phase coaxial busbars 34 and 35 and the normal busbar 36 are arranged horizontally and the two-phase coaxial busbars 37 and 38 are arranged vertically. And a normal bus bar 39. The busbar connection conduit 28 and the VCT connection conduit 29 are connected to each other via the coaxial connection conductors 42 and 43 and the connection conductor 44 provided in the insulating spacer 41.

In the busbar connecting conduit 28, the two phases of the power source side busbar 21 are connected to the outer busbars of the coaxial busbars 31 and 32. The one that has passed through the current transformer in the VCT 1 from this outer bus returns as the inner bus of the same coaxial bus 31, 32. The inner busbar and the load-side busbar 22 are connected by busbars 51 and 52. The remaining one phase of the power source side bus 21 is branched to the VCT 1 and the bus 53 by the normal conductor 33 and connected to the load side bus 22.

As described above, since the connecting bus bar which is arranged to reciprocate from the power source side bus bar 21 and the load side bus bar 22 to the VCT 1 is constituted by the coaxial bus bar, the connecting bus bar has a compact structure, and further, each connecting pipeline. Since the number of connecting buses arranged inside 28 and 29 is reduced, the space inside each connecting conduit 28 and 29 can be reduced.

Further, the busbar connecting conduit 28 is provided with ground switches 54 and 55 at both upper and lower ends. The upper grounding switch 54 includes the outer conductors of the coaxial buses 31, 32 and the conductor 33.
By being connected to the power supply side bus 21, the grounding switch is connected. Further, the grounding switch 55 on the lower side is connected to the busbars 51 to 53 so that the load-side busbar 22 is
It becomes a grounding switch connected to.

According to this embodiment, the ground switches 54, 55
Bus line connecting pipeline 2 without separately providing a place to install
8 can be arranged. In addition, the bus connecting line 28
Since they can be arranged at the upper and lower ends, their attachment and inspection work can be easily performed. Next, the structure of the coaxial bus and its connecting structure will be described.

FIG. 3 is an enlarged cross-sectional view of a part of the coaxial bus 31 in which the tip of the coaxial bus 31 is connected in the bus line connecting pipe 28. In the figure, the coaxial bus bar 31 is formed by an outer bus bar 61 and an inner bus bar 62, and an insulating spacer (not shown) is interposed between the two. Then, at the tip portion, the tip of the inner bus bar 62 is retracted inward from the tip of the outer bus bar 61.

A bus bar 63 introduced from the power supply side bus bar 21.
Are connected to each other by bolts with their ends abutted with the ends of the outer bus bar 61. An opening 64 is formed in the lower part of the outer busbar 61 and is connected to the inner busbar 62 by a bolt 6
5 is drawn out from this opening 64. A connecting portion 66 is provided at the tip of the conductor 65. A contact 67 is provided inside the connecting portion 66, and the busbar 52 connected to the load side busbar 22 is detachably connected. Further, a busbar 68 connected to the ground switch 54 is connected to the outer side busbar 61 at its upper side surface.

FIG. 4 is an enlarged partial cross-sectional view of the connecting portion between the coaxial connecting conductor 42 of the insulating spacer 41 and the coaxial bus 31 between the busbar connecting conduit 28 and the VCT connecting conduit 29. . The coaxial connecting conductor 42 provided on the insulating spacer 41 is composed of an outer conductor 71, an inner conductor 72, and an insulator 73 interposed therebetween. A contactor 74 is attached to the tip of the inner conductor 72. When connecting the coaxial bus 31 and the coaxial connecting conductor 42, the tip of the coaxial bus 31 is butted against the tip of the coaxial connecting conductor 42. As a result, the tip of the inner busbar 62 of the coaxial busbar 31 engages with the contactor 74 and is connected to the inner conductor 72. Also, the outer bus bar 6
1 is fixed and connected to the outer conductor 71 by a bolt 75.

FIG. 5 is an enlarged partial cross-sectional view of a connecting portion between the horizontally arranged coaxial bus 34 and the vertically arranged coaxial bus 37 in the VCT connection conduit 29. The vertical coaxial bus bar 37 is composed of an outer bus bar 81, an inner bus bar 82, and an insulator 83 interposed therebetween, and at the tip thereof, the inner bus bar 82 is configured to project from the outer bus bar 81.

Also, the horizontal coaxial bus 34 and the outer bus 84 are
And an inner busbar 85, and an insulator (not shown) keeps a distance between them. The connecting pieces 86 are attached to both side surfaces of the tip of the outer bus bar 84, and the first contact portion 87 is attached to the tip by bolts. The first contact portion 87 is formed in an annular shape so that the outer busbar 81 of the vertical coaxial busbar 37 can be inserted into the center hole, and a plurality of contacts 88 pressed toward the center thereof are attached. ing.

The inner busbar 85 has a connecting piece 9 at its tip.
1 is fixed by a bolt, and the connecting piece 91 is an outer busbar 84.
The second contact portion 92 is attached to the second contact portion 92 with a bolt by being bent upward at a position protruding from the tip end of the. The second contact portion 92 is also the first
Like the contact portion 87, it is formed in an annular shape so that the outer busbar 82 of the vertical coaxial busbar 37 can be inserted into its center hole, and the plurality of contacts 9 pressed toward the center thereof.
3 is attached. The second contact portion 92 is arranged above the first contact portion 87 via the insulator 94 and with their central axes aligned.

A horizontal coaxial bus 34 and a vertical coaxial bus 37
At the time of connection, the tip of the vertical coaxial bus 37 is inserted into the first and second contact portions 87, 92 attached to the tip of the horizontal coaxial bus 34. As a result, the outer busbar 81 of the vertical coaxial busbar 37 is connected to the first contact portion 87, and is connected to the outer busbar 84 of the horizontal coaxial busbar 34. Also,
The inner busbar 82 of the vertical coaxial busbar 37 has a second contact portion 92.
And the inner busbar 85 of the horizontal coaxial busbar 34.

As shown in FIGS. 3 to 5, the connecting portion of the coaxial bus can be made compact. that's all,
Although the embodiments of the present invention have been described, the present invention
Various modifications are possible within the scope described in the claims. For example, the vertical relationship between the power source side bus line and the load side bus line can be reversed from that in the above embodiment. This replacement can be easily performed by partially changing the connection part inside the VCT.

[0024]

According to the present invention, in the GIS in which the power supply side busbar and the load side busbar are arranged on the same side and vertically in parallel with respect to the VCT, the connection busbars in each connection pipeline are rationalized. Can be placed at.

[Brief description of drawings]

1 is a side view of a GIS according to an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram of FIG.

FIG. 3 is a side view showing details of the coaxial bus bar in FIG. 1.

FIG. 4 is a side view showing details of a connection conductor of the insulating spacer of FIG.

5 is a side view showing details of a connecting portion between the coaxial buses of FIG. 1. FIG.

FIG. 6 is a single line connection diagram of a conventional GIS.

FIG. 7 is a plan view of a conventional GIS.

FIG. 8 is a front view of FIG.

9 is a side view seen from the line S-S in FIG. 7.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... VCT 14 ... Upper pipeline 15 ... Lower pipeline 21 ... Power source side bus 22 ... Load side bus 23 ... Disconnector 24, 25, 41 ... Insulation spacer 26, 27, 44 ... Connecting conductor 28 ... Bus connecting line 29 ... VCT connection conduit 31, 32, 34, 35, 37, 38 ... Coaxial bus 33, 36, 39, 51, 52, 53, 63, 68 ... Bus 42, 43 ... Coaxial connection conductor 54, 55 ... Ground switch 61, 71, 81, 84 ... Outer busbars 62, 72, 82, 85 ... Inner busbars 65 ... Conductors 66, 87, 92 ... Contact portions

Claims (1)

[Claims] 1. A gas-insulated switchgear in which a power supply side busbar and a load side busbar are arranged on the same side and in parallel vertically with respect to a power supply / demand instrument transformer current transformer, wherein the power supply / demand instrument transformer is provided. A busbar connecting pipe is arranged between the current transformer and the two busbars, and the busbar connecting pipe and the transformer transformer for electric power supply and demand are provided on the transformer transformer for electric power supply and demand. A transformer current transformer connection pipeline for electricity supply and demand instrument for connecting
A gas-insulated switchgear, wherein a busbar that is reciprocally connected to the current transformer of the power transformer for a power supply and demand instrument is constituted by a coaxial busbar in each of the connection pipelines.