JPH0611163B2 - Gas insulated switchgear - Google Patents

Description

The present invention relates to the construction of a gas insulated switchgear.

The gas-insulated switchgear eliminates the exposure of the power-supply section by storing the power-supply section conductor in a metal airtight container filled with an insulating medium such as SF ₆ gas. It is made compact by reducing the required insulation distance. In general, since the closed container is set to the ground potential, the constituent devices can be arranged extremely close to each other in terms of electrical insulation. Further, by adopting a three-dimensional structure, the attachment area occupied by the switchgear can be significantly reduced.

However, this type of switchgear is subject to structural limitations from another aspect. In other words, each component requires maintenance and inspection, which requires a structure that facilitates maintenance and inspection and a space for maintenance and inspection. Even if the reliability of each component is improved, a large current such as a short-circuit current must be cut or turned off, and the breaker must be configured to be regularly inspected or capable of responding to an abnormality.

By the way, in important systems in substations, etc.
A configuration corresponding to FIGS. 4 to 4 is adopted. CB in the figure
A chopstick and a disconnector are shown, and a DS is a disconnector.

FIG. 5 shows a gas-insulated switchgear generally used corresponding to the electric circuit of FIG.

At the upper end of the vertically arranged shiya disconnector CB ₂ , the disconnector DS
_The upper electric circuit 3 constituting ₂₃ is connected substantially horizontally, and the cable 5 is insulated and led out via the cable head 4. The main bus 1 is connected via a disconnector DS ₂₁ to the lower end of the CB ₂ and the main bus 2 is connected via a disconnector DS ₂₂ .

Such a gas-insulated switchgear is small in size due to its three-dimensional structure and has excellent seismic resistance because the main buses 1 and 2 which are heavy objects are on the attachment surface side. Furthermore, since the shingle breaker CB ₂ is arranged on one side of the main busbar and connects the equipment connected to the shinkai breaker on the main busbar side, the shinshi breaker is a passage formed on the front surface thereof. Or it can be easily inspected from the inspection space. It also has many other advantages.

Despite these advantages, this type of configuration is not applied to the ring bus type gas-insulated switchgear shown in FIG.

An object of the present invention is to provide a gas-insulated switchgear having a reduced installation area and a short length of a connecting bus line.

The gas-insulated switchgear of the present invention includes a first vertical circuit breaker between a first circuit and a second vertical circuit breaker between a second circuit, and a fourth vertical circuit breaker between a second circuit and a third vertical circuit breaker. The first and second upper busbars are respectively connected to the first circuit of the circuit breaker, and the second circuit of the first vertical circuit breaker and the first circuit of the fourth vertical circuit breaker and the second circuit of the fourth circuit breaker are connected. Other than connecting the first electric circuit of the vertical circuit breaker and the second electric circuit of the third vertical circuit breaker by the third and fourth lower bus lines, respectively, other connecting bus lines (21 in FIG. 6). ) Is not required, the installation area of the gas-insulated switchgear can be reduced by this amount, the length of the connecting bus line can be shortened, and the electrical resistance can be lowered.

Details will be described below with reference to embodiments of the drawings.

As can be seen from FIG. 6, the vertical combs and breakers CB ₁₄ are linearly juxtaposed. For this reason, inspection of the break and breaker can be performed from one side.

The busbars supported on the attached surface are busbars 1a and 1b provided on the axis close to the shank and the breaker, and a busbar 2 juxtaposed on another axis.
It consists of and. Bus bar 1a connects between the breaker and the breakers CB ₁ and CB ₂ , and bus bar 1b connects between the breaker and the breakers CB ₃ and CB ₄ ,
The busbar 2 connects between the breaker and the breakers CB ₁ and CB ₄ . The cables 18 used as the insulation and derivation means for exchanging electric power between each sushi and the breaker are respectively provided at the positions shown in the drawings, but may be at other positions as long as they are electrically compatible. It can also be bushing.

As can be seen from the figure, one unit is constructed around one unit and a breaker, and the entire unit is constructed from four units.

Each unit is as shown in FIGS. 7 to 10, and the advantages of the standard configuration shown in FIG.

FIG. 7 is a Yunitsuto having to and disconnection device CB _1, vertical-type and or the upper path of the cross-sectional unit CB ₁ is connected to the bus 2 via a disconnecting switch DS _11, whereas the lower path is disconnectors DS ₁₂ It is connected to the bus bar 1a via. A cable 18 is connected to the bus bar 2 via a cable head 17.

As shown in FIG. 8, the end of the busbar 1a is connected to the lower electric circuit of the CB ₂ via a disconnector DS ₂₁ and is also connected to a cable 18 via a cable head 17.
On the other hand, the upper electric circuit is connected to one end of the bus bar 16 via a disconnector DS ₂₂ . The busbar 16 is located above the busbar 1a and extends in the same direction. The other end of the busbar 16 is connected to the upper electric path of the CB ₃ in FIG. 9 via the disconnector DS ₃₂ . The lower electric circuit of the breaker CB ₃ is connected to the bus 1b via the disconnector DS ₃₁ . This bus bar 1b is the bus bar 1a
On the same axis as the above, the breaker CB ₂ and CB ₃ are divided so that their ends are opposed to each other.

As shown in FIG. 10, the other end of the bus bar 1b is connected to the CB ₃ and C breakers.
It is connected to the lower end of a bus bar 21 which is raised almost vertically between B ₄ . In this example, the busbar 21 is as if branched from the busbar 1b, but the busbar 21 can be obtained by bending the end of the busbar 1b upward. The upper end of the bus bar 21 is connected to the upper electrical circuit of the breaker and the breaker CB ₄ via a disconnector DS ₄₂ , and is also connected to a cable 18 via a cable head 17. The lower electric circuit of the Shinya disconnector CB ₄ is the disconnector DS
It is connected to the bus 2 via ₄₁ . In this way, the electric circuit of FIG. 4 is completed.

As can be seen from the above description, each unit is constructed based on the standard configuration shown in FIG. 5, and its advantages, for example, maintenance and inspection of each sill and disconnector, and attachment of the busbar 2 having a large axial length. It inherits the support, etc.

FIGS. 11 to 15 show a gas-insulated switchgear according to another embodiment, in which all the busbars can be configured to extend in the same direction without using the busbar 21 of FIG. The same parts as those in the previous example are designated by the same reference numerals.

As can be seen from FIG. 11 which is a plan view, the gas-insulated switchgear of this embodiment has a configuration closer to that of FIG. 5 than the previous embodiment. Circuit breaker C placed in a closed container containing gas
To connect between B ₁ and CB ₂ are bus 1a, CB ₂
And a bus 16 to connect the CB _3, CB ₃ and C
It is the bus bar 1b that connects between B ₄ and CB ₄ and CB ₁
The spaces are connected by a bus 2.

The unit of the circuit breaker CB ₁ is as shown in FIG. 12, the lower electric line 30 is connected to the bus bar 2 supported on the attached surface via the disconnector DS ₁₁ , and the upper electric line 31 is connected to the bus line 1a via the disconnector DS _12. It is connected. The busbar 1a is located almost directly above the busbar 2, but may be displaced.

The other end of the bus 1a that the bus 2 extending in the same direction are connected through a disconnector DS ₂₁ upward path 31 of the circuit breaker CB ₂ in FIG. 13. The lower electric circuit 30 of the circuit breaker CB ₂ is connected to one end of the bus bar 16 via a circuit breaker DS ₂₂ .
The bus bar 16 is supported on the attached surface and extends in the same direction as the juxtaposed direction of the circuit breakers, and the other end is connected to the lower electric circuit 30 of the circuit breaker CB ₃ shown in FIG. 15 via a circuit breaker DS _32. There is. Therefore, the bus bar 16 passes through the unit of the adjacent circuit breaker CB ₄ as shown in FIG.

The upper circuit 31 of the circuit breaker CB ₃ of FIG.
It is connected to the bus 1b via the S _31. The bus bar 1b is on the same axis as the bus bar 1a, and the other end is connected to the upper electric circuit 31 of the circuit breaker CB ₄ of FIG. 14 via a disconnector DS ₄₂ . The lower electric circuit 30 of the circuit breaker CB _{4 is} a circuit breaker D.
It is connected to the above-mentioned bus 2 via S ₄₁ .

Furthermore, the above-mentioned first and fourth vertical breakers CB _{1 to} CB ₄
The connection will be described with reference to FIGS. 11 to 15.

The first vertical circuit breaker CB ₁ and the third vertical circuit breaker CB ₃ are arranged at both ends, and are housed in the first electric path 31, the second electric path 32, and the second container 33 on the upper and lower sides.

The second vertical circuit breaker CB ₂ and the fourth vertical circuit breaker CB ₄ are arranged between the first vertical circuit breaker CB ₁ and the third vertical circuit breaker CB _3, and the first vertical circuit breaker CB 4 and the fourth vertical circuit breaker CB ₄ are arranged on the upper and lower sides. 2 electric circuit 30 and 1st electric circuit 3
1 is arranged.

Between the first electric circuit 31 of the first vertical circuit breaker CB ₁ and the second electric circuit 30 of the second vertical circuit breaker CB ₂ and the fourth vertical circuit breaker CB _4.
Second electric circuit 30 and first electric circuit 31 of the third vertical circuit breaker CB ₃ .
Between the first and second upper busbars 1A and 1B, respectively.
Connecting container 3 connected at both sides and accommodated on both upper side buses 1a and 1B
Reference numeral 4 connects between both containers 32 and 33.

Between the second electric circuit 30 of the first vertical circuit breaker CB ₁ and the first electric circuit 31 of the fourth vertical circuit breaker CB ₄ and the first of the second vertical circuit breaker
The electric line 31 and the second electric line 30 of the third vertical breaker CB ₃ are connected by third and fourth lower busbars 2 and 16, respectively.
First and second lower busbar containers 3 accommodating both lower busbars 2 and 16
Reference numerals 5 and 36 connect between the containers 32 and 33.

In this way, according to the configuration of FIG. 11, the first and second upper busbars 1A and 1B are directly connected to the upper electric paths 30 and 31 of CB _{1 to} CB ₄ , respectively. and fourth lower busbar 2A, in the 2B, the vertical breaker _CB 1 to CB ₄
Since the lower electric lines 30 and 31 are directly connected, the installation area of the gas insulated switchgear can be reduced by the amount that the electric line 21 and the container in FIG. 6 are not required. In addition, the third lower busbar 2 is provided between the vertical circuit breakers CB ₁ and CB ₄ , and the fourth lower busbar 16 is provided between the vertical circuit breakers CB ₂ and CB ₄ , respectively.
Although the circuit breakers are connected to each other, the third and fourth circuit breakers in FIG.
Since the bus bar corresponding to the lower bus bar connects between the four circuit breakers, the lower bus bar connection of the present invention can connect one less circuit breaker than that in FIG. 6, so that the length can be shortened. ,
There is an advantage that the electric resistance can be reduced.

[Brief description of drawings]

1 to 4 are different electric circuit diagrams of the switchgear, FIG. 5 is a front view showing one unit of a known gas-insulated switchgear, and FIG. 6 is a gas-insulated switchgear according to an embodiment of the present invention. 7 is a plan view of FIG. 7, and FIG. 7 to FIG.
-VII, VIII-VIII, IX-IX and XX sectional views, FIG. 11 is a plan view of a gas insulated switchgear according to another embodiment of the present invention, FIGS. The figure shows XI in Fig. 11.
It is sectional drawing which followed the I-XII line, the XIII-XIII line, and the XIV-XIV line. 1a, 1b, 2, 16, 21 ... Busbar, CB ...
Shiya disconnector, DS ... disconnector.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Amano 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubun Plant, Hitachi, Ltd. (72) Inventor Yoriyuki Aiko 1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Inside the Hitachi Kokubun Plant (72) Inventor Hitoshi Kayaba 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Hitachi Kokubun Plant (72) Inventor Ken Takahashi 1-chome Marunouchi, Chiyoda-ku, Tokyo No. 5 No. 1 within Hitachi, Ltd. (56) Reference JP-A-57-193911 (JP, A) JP-A-57-211915 (JP, A)

Claims (1)

[Claims] 1. At least four first and fourth circuit breakers are connected in a ring shape by first and second electric circuits, and these circuit breakers are provided.
In the one in which the electric circuit is housed in a gas-containing closed container, each of the first and fourth circuit breakers is arranged vertically, and both ends of the vertical circuit breaker are connected to the first circuit and the second circuit, Connecting the first electric line and the second electric line, connecting the first electric line and the second electric line to the provided cable head and busbar, arranging the first vertical circuit breaker and the third vertical circuit breaker at both ends, and The first and second electric circuits are arranged on the upper side and the lower side, and the second vertical circuit breaker and the fourth vertical circuit breaker are arranged between the first vertical circuit breaker and the third vertical circuit breaker, The second electric circuit and the first electric circuit are arranged on the upper side and the lower side, respectively, and between the first electric circuit of the first vertical circuit breaker and the second electric circuit of the second vertical circuit breaker and the fourth electric circuit of the fourth vertical circuit breaker. The second electric circuit and the first electric circuit of the third vertical circuit breaker are connected by the first and second upper busbars, respectively, and the second electric circuit of the first vertical circuit breaker and the first electric circuit of the fourth vertical circuit breaker are connected. 1 train Gas insulation, characterized in that the third and fourth lower busbars are respectively connected between the circuit and the first circuit of the second vertical circuit breaker and the second circuit of the third vertical circuit breaker. Switchgear.