JPH0613542Y2 - Gas insulated switchgear - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a gas-insulated switchgear installed in a substation of a 11/2 circuit breaker distribution system.

[Prior Art] As a circuit of a distribution substation with a double bus line configuration in which a cable or an overhead line is connected to two main bus lines via a circuit breaker, the main bus line and the second main bus line are arranged in series. The circuit of the 11/2 circuit breaker distribution system, which is connected by the switching circuit including the three circuit breakers, draws the load side line from the circuit between the adjacent circuit breakers through the cable head or the bushing. Are known.

Fig. 5 is a single line connection diagram showing the structure of each phase of the 11/2 circuit breaker power distribution system per line. In the same figure, BUS1 and B
US2 is the main and second main buses, CB1 to CB3 are the first to third circuit breakers, CHd1 and CHd2 are the first and second cable heads, respectively.
b1 and DSb2 are first and second busbar-side disconnectors provided between the circuit breakers CB1 and CB2 and the main buses BUS1 and BUS2, respectively, and DS11 and DS22 are between the cable head CHd1 and the circuit breaker CB1, respectively. The first and second line disconnectors, DS12 and DS21, provided between the cable head CHd2 and the circuit breaker CB3 are respectively between the cable head CHd1 and the circuit breaker CB2 and between the cable head CHd2 and the circuit breaker CB2. First and second provided in
Of the line breakers, CT11 and CT12, are first breaker current transformers CT21 and CT22 provided on both sides of the breaker CB1.
Is a second circuit breaker current transformer provided on both sides of the circuit breaker CB2, and CT31 and CT32 are third circuit breaker current transformers provided on both sides of the circuit breaker CB3, respectively.

Actually, other devices such as a grounding switch and a lightning arrester are appropriately provided, but FIG. 5 omits the illustration of these devices and shows only the basic configuration.

The configuration of one line of the gas insulated switchgear in the conventional substation adopting the 11/2 circuit breaker power distribution system is as shown in Fig. 6, and conventionally, the equipment constituting the circuit of Fig. 5 has independent gas. A series of devices DSb1, CT11, CB1, CT12, DS11, housed in separate containers forming a space, and arranged between main buses BUS1 and BUS2 arranged at a considerable distance.
CHd1, ... were arranged side by side in the same order as the single line diagram.

[Problems to be Solved by the Invention] As shown in FIG. 6, in the conventional gas insulated switchgear of the 11/2 circuit breaker power distribution system, the devices are arranged side by side as shown in the single-line connection diagram. There was a problem in that the distance between the main and sub bus lines of Kotsu Oto became long and the equipment became large in size, requiring a lot of installation space.

The object of the present invention is to connect a first main circuit breaker and a second main circuit breaker by connecting them via a switching circuit including first to third circuit breakers arranged in series. In the gas insulated switchgear of the 11/2 circuit breaker distribution system, wherein the first and second cable heads are connected to the circuit between the circuit breaker and the circuit between the second circuit breaker and the third circuit breaker, respectively. The aim is to downsize the device.

[Means for Solving Problems] In the present invention, the switching circuit includes a first unit A including a first circuit breaker and a first cable head, and a second unit A
The second unit B including the circuit breaker and the third unit C including the third circuit breaker and the second cable head are separately configured.

Each of the first to third units A to C has a structure in which the devices constituting the respective main circuits (circuits in which the main circuit current flows) are arranged along the same device arrangement plane in each unit. C to C are aligned in one direction with the respective device arrangement planes parallel to each other.

A connection between the first unit and the second unit and a second
The connection between the unit and the third unit is made by a connecting bus bar arranged on the back side of the unit.

The A main bus and the second main bus are placed next to each other on the front side of the unit in parallel with the parallel installation direction of the units, and the main main bus and the second main bus are connected to the first unit and the third unit, respectively. .

[Advantage of the Invention] As described above, the switching circuit for connecting the two main buses to the first and third units is divided into the first to third units and these units are arranged in parallel in one direction. Or, if the device is arranged adjacent to the front side of the third unit in the same direction as the side-by-side installation direction of the units, the devices forming the switching circuit are sequentially arranged between the main busbars of A and B with a considerable distance. The space in the direction perpendicular to the longitudinal direction of the main bus can be significantly reduced as compared with the conventional configuration.

In addition, as described above, the devices constituting the respective main circuits of the first to third units are arranged in the respective units along the same device arrangement plane, and the respective device arrangement planes are parallel to each other. By arranging the first to third units side by side, the distance between the units can be minimized to reduce the space in the longitudinal direction of the main bus.

Thus, according to the present invention, both the space in the longitudinal direction of the main bus bar and the space in the direction perpendicular to the longitudinal direction of the main bus bar can be reduced, so that the device can be downsized. The installation space for the 11/2 circuit breaker power distribution type gas-insulated switchgear can be greatly reduced compared to the conventional system.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show the construction of an embodiment of the present invention, and FIG. 1 is a construction explanatory view showing the construction of the first to third units and the connection between the units, and FIG. FIG. 4 is a top view showing the arrangement of units.

In the present embodiment, the electrical structure of each phase of the gas insulated switchgear per line is as shown in the single wire connection diagram of FIG. 5 already described.

In the present embodiment, the switching circuit for connecting between the main bus BUS1 and the second main bus BUS2 includes the first to third circuit breakers C.
First to third centering on B1 to CB3, respectively
The units A to C are divided into units, and these units A to C are arranged as shown in FIGS. 1 and 2.

As shown in FIG. 2, the first to third units A to C constitute a gas insulated switchgear for one line, and in this embodiment, a gas insulated switchgear GIS1 for four lines having the same configuration. ~ CIS4 is installed side by side,
These gas-insulated switchgear are connected by the main bus BUS1 and the second main bus BUS2. The configuration of each unit will be described below.

In this embodiment, the predetermined devices are collectively stored in the container of each element constituting each unit for three phases, but in the drawing, only one phase of the devices is abbreviated by a circuit symbol. is there.

Configuration of First Unit A As shown in the upper part of FIG. 1, the first unit A includes a first circuit breaker element E11, a first cable head element E12, and a first busbar side disconnector. Element E13
And a connecting busbar element E14.

The first circuit breaker element E11 is connected to the first circuit breaker CB1 in a vertical cylindrical first circuit breaker container 3 supported on a base 2 having a rectangular parallelepiped shape. The flowmeters CT11 and CT12 are stored for three phases. The upper part of the front side and the lower part of the back side of the container 3 are respectively stub 3a
And 3b are provided, and insulating spacers S11 and S12 are attached to these nozzle stubs 3a and 3b. One end of the circuit breaker CB1 is connected to the through conductor of the insulating spacer S11 via the connecting conductor 4, and the other end is connected to the through conductor of the insulating spacer S12 via the connecting conductor 5. Current transformer CT11
, And CT12 are mounted on the connecting conductors 4 and 5, respectively. The gantry 2 also serves as an operating device box, and the operating device of the circuit breaker CB1 is housed inside the gantry.

The first cable head element E12 is a cable head CHd1 in a vertically long cylindrical container 7 supported on a frame 6.
And the first line disconnector DS11 are housed in a container 7
The nozzle part 7a provided on the front side of the container is connected to the nozzle part 3b on the rear side of the container 3 via the insulating spacer S12.
A tube base 7b is provided on the upper rear side of the container 7,
The container 8 of the connecting busbar element E14 is connected to this nozzle part via an insulating spacer S13. Cable head C
Hd1 is attached to the bottom of the container 7 in an upright state, and its center conductor is connected to the through conductor of the insulating spacer S12 via the disconnector DS11.

The connecting busbar element E14 has a busbar conductor 9 housed in a cross-shaped container 8, and one end of the busbar conductor 9 is connected to the conductor connected to the central conductor of the cable head CHd1 through the through conductor of the insulating spacer S13.

The first busbar-side disconnector element E13 has an insulating spacer S
A bus-side disconnector DSb1 is housed together with a conductor 11 forming a part of the instep main bus BUS1 in a cross-shaped container 10 connected to a nozzle base 3a of the container 3 via a main bus BUS1. Is connected to one end of the circuit breaker CB1 through the disconnector DSb1 and the through conductor of the insulating spacer S11.

Configuration of Second Unit B The second unit B comprises a second circuit breaker element E21 and first and second current transformer elements E22 and E23, as shown in the central part of FIG. And first and second connection busbar disconnector elements E24 and E25.

The second circuit breaker element E21 is one in which the second circuit breaker CB2 is housed in a vertically long cylindrical container 21 supported on a frame 20 that also serves as an operator box, and a circuit breaker CB2 is contained in the frame 20. The operating devices of are stored.

The first and second current transformer elements E22 and E23 are arranged in tubular containers 22 and 23, respectively.
It contains the primary conductors 24 and 25 fitted with 22,
One ends of the containers 22 and 23 are connected to the nozzle parts 21a and 21b provided on the lower and upper portions of the back surface of the container 21 via insulating spacers S21 and S22, respectively. 1
Subsequent conductors 24 and 25 are insulating spacers S21 and S, respectively.
It is connected to one end and the other end of the circuit breaker CB2 via 22 through conductors.

First and second connecting busbar disconnector elements E24 and E25
Is a cross-shaped container 26 and 27 together with busbar conductors 28 and 29, respectively, and first and second line disconnectors DS12.
And DS21 are housed, and the containers 26 and 27 are connected to the other ends of the tubular containers 22 and 23, respectively, via insulating spacers S23 and S24. Bus conductors 28 and 29
Are disconnectors DS12 and DS21 and insulating spacer S23, respectively.
And through conductors of S24, are connected to the primary conductors 24 and 25.

Configuration of Third Unit C The third unit C comprises a third circuit breaker element E31,
It comprises a second cable head element E32, a second busbar-side disconnector element E33 and a connecting busbar element E34.

The third circuit breaker element E31 is a container 31 having a vertically long cylindrical shape supported on the pedestal 30 and containing the third circuit breaker CB3 and the current transformers CT31 and CT32.
31 and CT32 are mounted on conductors connected to one end and the other end of the circuit breaker CB3, respectively. The gantry 30 also serves as an operation device box, and the operation devices of the circuit breaker CB3 are housed therein.

The second cable head element E32 has a vertically elongated cylindrical container 33 supported on the pedestal 32, in which the second cable head CHd2 and the second line disconnector DS22 are housed. Pipe part 33 provided on the upper side
a is connected via an insulating spacer S31 to a nozzle part 31b provided on the upper portion on the back side of the container 31. The central conductor of the second cable head CHd2 is connected to the conductor equipped with the current transformer CT32 via the disconnector DS22 and the penetrating conductor of the insulating spacer S31.

The second busbar-side disconnector element E33 is one in which the conductor 35 forming the second busbar BUS2 and the second busbar-side disconnector DSb2 are housed in a cross-shaped container 34, and the container 34 has an insulating spacer S32 interposed therebetween. Abutment part 3 on the lower back side of the container 31
It is connected to 1a. The conductor 35 is connected to the conductor equipped with the current transformer CT31 via the disconnector DSb2 and the through conductor of the insulating spacer S32.

The connecting busbar element E34 has a busbar conductor 37 housed in a cruciform tubular container 36, and the container 36 is connected to an abutment portion 33b at the upper rear side of the container 33 via an insulating spacer S33. The busbar conductor 37 is connected to the conductor connected to the central conductor of the cable head CHd2 via the through conductor of the insulating spacer S33.

Each container of each unit has an airtight structure, and SF ₆ gas is sealed in each container at a predetermined pressure.

In the first to third units A to C, the devices forming the main circuit of each phase are arranged in the respective units along the same device arrangement plane (a plane parallel to the paper surface of FIG. 1). As shown in FIG. 2, the first to third units A to C having a structure are arranged in one direction with their respective device arrangement planes 01-02 parallel to each other.

As shown in FIG. 2, the space between the containers 10, 10 of the first busbar-side disconnector element E13 provided on the front side of the first unit A of the adjacent line is parallel to the unit. The instep main bus BUS1 that is connected through the extending tubular containers 40 and 41, and that extends in parallel to the juxtaposed direction of the units is configured by the conductors accommodated in these tubular containers and the conductor 11 accommodated in the container 10. ing.

Similarly, the container 3 of the second busbar side disconnector element E33 provided on the back side of the third unit C of the adjacent line.
4, 34 are connected to each other via tubular containers 42, 43 (see FIG. 1), and the conductors arranged in the tubular containers 42, 43 and the conductor 35 arranged in the container 34 form a unit. The second main bus BUS2 extending in the juxtaposed direction is configured.

In the present embodiment, the main and secondary main buses BUS1 and BUS2 are arranged vertically adjacent to each other on the front side of the unit, and the devices constituting the main circuit of each unit form a device array plane perpendicular to these main buses. Are arranged along.

Further, the container 8 of the connecting busbar element E14 provided on the back side of the first unit A of each line is provided with the insulating spacer S8 on the container 26 of the connecting busbar disconnecting switch element E24 provided on the back side of the second unit B. Connected through. Then, the busbar conductor 9 arranged in the container 8 and the busbar conductor 28 arranged in the container 26 are connected to each other through the penetrating conductor of the insulating spacer S8.
Connecting between the unit A and the second unit B of the first
The connecting bus BUS3 of is constructed.

Further, the container 27 of the second connection bus disconnector element E25 on the rear side of the second unit B of each line is the third unit C.
Is connected to the container 36 of the connecting busbar element E34 on the rear side of the via an insulating spacer S9. A busbar conductor 29 in the container 27 and a busbar conductor 37 in the container 36 are connected to each other via an insulating spacer S9, and the two busbar conductors 29 and 37 connect the second unit B and the third unit C. The second connection bus BUS4 is configured.

The gas insulated switchgear of the present invention and the conventional gas insulated switchgear of this type are schematically shown in three-dimensional arrangement as shown in FIGS. 3 and 4, respectively. Conventionally, as shown in Fig. 4, the equipment was placed between the main bus lines BUS1 and BUS2, which are spaced a considerable distance apart, in the order shown in the single-line diagram, so the space between the main bus lines is large. Became so big that it was unavoidable that the whole became large.

On the other hand, in the present invention, as shown in FIG.
The switching circuit for connecting the first and second main buses BUS1 and BUS2 is divided into the first to third units A to C, and these units are arranged in one direction and aligned, and the first and third main buses are set to the first to third units. Since the units are arranged next to each other on the front side of the units A to C in the same direction as the parallel arrangement direction of the units, the space in the direction perpendicular to the longitudinal direction of the main busbar is significantly larger than the conventional configuration. Can be reduced to.

In addition, as in the present invention, the devices constituting the main circuit of each unit are arranged along the same device arrangement plane in each unit, and the first to third units are arranged in parallel with each other. If the units are arranged side by side in a state, the distance between the units can be minimized to reduce the space in the longitudinal direction of the main bus.

Therefore, according to the present invention, both the space in the longitudinal direction of the main bus bar and the space in the direction perpendicular to the longitudinal direction of the main bus bar can be reduced, and the installation space of the device can be significantly reduced as compared with the conventional one. it can. If the installation space is reduced, the design and construction of the gas insulated switchgear can be facilitated when the gas insulated switchgear is stored in the building, and the construction cost can be reduced.

In the above embodiment, the first and second cable heads CHd1 and CHd2 are preferably provided so as to be aligned in a direction parallel to the busbars BUS1 and BUS2. If all cable heads are arranged in a straight line,
The design and construction of the cable pit provided on the base of the gas insulated switchgear can be facilitated.

Similarly, it is preferable that the first to third circuit breakers CB1 to CB3 are also provided so as to be aligned in a direction parallel to the bus lines BUS1 and BUS2. If all the circuit breakers are arranged in a straight line, the excess on the foundation of the gas-insulated switchgear becomes uniform, and the design and construction of the foundation can be facilitated.

As mentioned above, the two main buses BUS1 and BUS2 are arranged next to each other outside the unit, and the connecting bus BUS3
If the BUS4 and the BUS4 are arranged next to each other outside the unit, installation work and line extension work can be easily performed.

Like the first and third units of the above embodiment, when the current transformers are arranged in the circuit breaker container and attached to the conductors on both sides of the circuit breaker, the size of the unit in the direction perpendicular to the main busbar is reduced. can do.

In the above embodiment, the current transformers CT21 and CT22 of the second unit B are housed in the independent vessels 22 and 23, respectively, but these current transformers are the vessels of the second circuit breaker element E21. It may be arranged in 21. Further, in the above embodiment, the connection was made with a cable, but it is also possible to connect with an overhead line. In this case, the first and second cable heads CHd1 and CH
This can be dealt with by installing a bushing instead of d2.

[Effects of the Invention] As described above, according to the present invention, the switching circuit for connecting between the main busbars of the first and second shells is divided into the first to third units A to C, and these units are arranged side by side in one direction. In addition, the main and secondary main buses are arranged side by side on the front side of the first to third units in the same direction as the parallel installation direction of the units. The space in all directions can be reduced significantly. Further, the devices constituting the main circuit of each unit are arranged in the same unit along the same device arrangement plane, and the first to third units are arranged in parallel with the respective device arrangement planes in parallel. Since the configuration is adopted, the distance between the units can be minimized to reduce the space in the longitudinal direction of the main bus.

Therefore, according to the present invention, the space in the longitudinal direction of the main busbar and the space in the direction perpendicular to the longitudinal direction of the main busbar can be reduced together to miniaturize the device, and the installation space can be reduced. There is an advantage that the size can be greatly reduced compared to the conventional one.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing the constitution of each unit of the embodiment of the present invention and the connection relation between the units, and FIG. 2 is a top view showing the arrangement of the units of the same embodiment, FIGS. 3 and 4. 3 is an explanatory view schematically showing a three-dimensional arrangement of the devices of the embodiment of the present invention and the conventional example, and FIG. 5 is a target of the present invention.
Single wire connection diagram showing the basic configuration of each phase of the 1/2 circuit breaker power distribution type gas insulated switchgear, and Fig. 6 shows the configuration of the conventional 11/2 circuit breaker power distribution type gas insulated switchgear It is a figure. CB1 to CB3 ... First to third breakers, CHd1 and CHd2 ... First and second cable heads, CT11,
CT12, CT21, CT22, CT31, CT32 ... Current transformer,
DSb1 and DSb2 ... First and second busbar-side disconnectors, D
S11 ... first line disconnector, DS22 ... second line disconnector, DS21 and DS21 ... first and second line disconnector, BUS1 ... Ko main bus, BUS2 ... Otsu main bus.

Claims (1)

[Scope of utility model registration request] 1. A first circuit breaker and a second circuit breaker are connected by an opening / closing circuit including first to third circuit breakers arranged in series between the instep main bus and the second main bus. Circuit between and second
In the gas insulated switchgear of the 11/2 circuit breaker distribution system, wherein the first and second cable heads or bushings are connected to the circuit between the circuit breaker and the third circuit breaker, respectively, wherein the switching circuit is A first unit including the first circuit breaker and a first cable head or bushing; a second unit including a second circuit breaker; and a third circuit breaker and a second cable head or bushing It is configured by being divided into a third unit, and each of the first to third units has a structure in which devices constituting respective main circuits are arranged along the same device arrangement plane in each unit. , Arranged in one direction with the respective device arrangement planes in parallel with each other, arranged between the first unit and the second unit, and between the second unit and the third unit. Connecting busbars for connecting the respective units are arranged on the rear side of the unit, and the main and second main buses are arranged next to each other on the front side of the first to third units in parallel with the juxtaposed direction of the units. A gas-insulated switchgear, which is arranged and connected to each of the first unit and the third unit.