JPS5915445B2 - gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas-insulated switchgear which is constructed in a container filled with an insulating gas and insulated from the container.

Gas-insulated switchgears use SF6 gas or the like as an insulating gas, and can be significantly smaller than air-insulated switchgears.

For this reason, they are often used in substations around cities.

Modern gas insulated switchgear is divided into two types.

One is that only the so-called switchgear such as circuit breakers, disconnectors, and earthing switches are gas-insulated, and the busbar is air-insulated.

The other type is a gas-insulated system including the bus bar.

Regardless of which method is adopted, when multiple feeder gas insulated switchgears are connected to a bus, the substation tends to be long in the axial direction of the bus, which limits the site shape and also As the number increases, the installation area will increase significantly.

In other words, in conventional devices of this kind, multiple sets of feeder gas insulated switchgears are arranged in the axial direction of the busbar, which are introduced and exited perpendicularly to the busbar. The insulation distance between the device's lead-in terminal bushings is polished and increases in the axial direction of the bus bar.

Further, in the case of a gas insulated bus bar, a predetermined distance must be maintained between each feeder gas insulated switchgear due to the mechanical strength of the container of the gas insulated bus bar, so that the I/i width increases in the axial direction of the bus bar.

FIG. 1 shows a part of a conventional circuit diagram in the direction of double busbars.

The first and second buses 1 and 2 are connected by two disconnectors 3 and 4, and the other end of the breaker 5, which has one end connected between the disconnectors, is connected to the other end of the breaker 6, forming a feeder switching device. There is.

A plurality of sets of this feeder opening/closing device are provided as necessary.

The configuration of a conventional gas insulated switchgear using such a system is shown in FIGS. 2 and 3.

FIG. 2 is a front view, in which gas insulated disconnectors 3 and 4 are connected to each of the three-phase gas insulated busbars 1.degree.

The disconnectors 3 and 4 are connected by a gas insulated conductor 7.

A horizontally arranged gas insulated disconnector 5 is connected to the disconnector 4 side, and a gas insulated disconnector 6 is further connected linearly and led out by a cable 8.

As can be seen from the plan view of FIG. 3, the feeder gas insulated switchgear configured in this manner has a phase-separated structure for each bus bar, and is arranged side by side along the axial direction of the gas insulated bus bars.

Therefore, if we look at it as a whole. It was long along the axial direction of the generatrix.

A piece of land constituting a substation cannot necessarily be secured with sufficient margin, and may not be large in the axial direction of the bus bar due to its configuration.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas insulated switchgear whose configuration is simplified by preventing the bus bar from increasing in the axial direction.

In the case of a double busbar configuration, the present invention arranges three sets of busbars in parallel on substantially the same plane, electrically connects two sets of the busbars, and arranges feeder gas insulated switchgear on both sides of these busbar devices. This is what I did.

Embodiments of the present invention will be described below with reference to the drawings.

4 and 5 are a front view and a plan view of the gas insulated switchgear corresponding to FIG. 1, and the same parts are given the same reference numerals and explained.

On the installation surface, three sets of gas insulated busbars 1 and 2 are arranged side by side on the same horizontal plane.

This gas insulated bus bar is constructed by arranging a conductor in a container filled with an insulating gas and insulated from the container.

Hereinafter, the bus line 1 will be referred to as the first bus line, and the bus line 2 will be referred to as the second bus line.

'The first bus line 1 is placed on both sides of the second bus line 2.

A gas insulated disconnector 3 is connected to the upper part of the upper busbar 1.

On the outside of the busbars 1 and 2, there is a gas breaker 5 arranged horizontally and connected to a gas insulated breaker 3, respectively.A gas insulated breaker 6 is connected to the end of this gas breaker 5, and the cable is further connected to the gas breaker 5. 8.

A gas insulated disconnector 4 is horizontally connected between the gas insulated disconnectors 3, and a bus bar 2 is arranged and connected between the gas insulated disconnectors 4 via a gas insulated connection conductor 10.

This gas insulated connection conductor 10 is. It has electrically connected connection parts in three directions, one connection part is connected to the gas insulated bus bar 2, and the other two connection parts are connected to gas insulated disconnectors 4, respectively.

The first and second bus lines 1 and 2 are on almost the same horizontal plane.

In other words, this embodiment has a configuration that is symmetrical about the gas insulated bus bar 2 in the conventional system.

As can be seen from the figure, two sets of feeder gas insulated switchgears of the same phase can be constructed approximately linearly by the gas insulated switchgears arranged on the left and right sides of each bus bar.

Moreover, since the gas insulated connecting conductor 10 can be shared in common, the configuration can be simplified compared to the conventional example in which all the gas insulated switchgears for feeders are arranged on one side of the bus bar.

11 is a gas insulated connection conductor for connection between the gas insulated disconnector 6 and the cable 8.

Further, as can be seen from FIG. 5 in particular, if the gas insulated switchgear located on the right side of each bus bar is also placed on the left side as in the past, the bus bar will need to have an axial length twice the length in the drawing.

Therefore, if the configuration of this embodiment is adopted, one set of bus bars shown in the drawing can be omitted.

Accordingly, the installation area in the axial direction of the generatrix can be reduced.

FIG. 6 is a three-phase connection diagram of the double bus system in this embodiment.

utVtW indicates each phase. When the first bus line 1 fails, the disconnect switch 3 is opened to continue operation, and when the second bus line fails, the disconnect switch 4 can be opened to continue the operation.

This is similar to the conventional example.

In the above embodiment, a frame for the gas circuit breaker 5 is required because the three-phase gas clear buses 1 and 2 are disposed on the installation surface side due to their weight and axial length.

Considering that the breaker is a device that requires inspection, it is desirable to place it near the installation surface.

An example that facilitates this inspection is shown below. FIG. 7 shows a front view, and by rotating the three sets of busbars 1, 2 and gas insulated disconnectors 3, 4 shown in FIG. It is abbreviated or omitted.

According to this embodiment, the inspection work of the gas breaker 5 can be easily performed without requiring work at a high place.

A further different embodiment is shown in FIG.

This embodiment is an example in which the bus bars 1 and 2 and the gas breaker 5, which are heavy objects, are both arranged near the installation surface.

In particular, when the bus bar is a three-phase waste type, it becomes a heavy object, so this embodiment is most suitable.

The configuration near the busbar is the same as the example in Fig. 4, and the gas
The connection configuration between the i-unit 5 and the upper bus line 1 is different.

The gas breaker 5 is usually a grounded tank type gas breaker.
It is connected to the upper busbar 1 side via a gas disconnection connection conductor 20 to a mounting flange formed above the end of the tank.

In all of the above embodiments, the first and second buses 1 and 2 are gas-insulated buses, but the same effect can be obtained even if they are air-insulated buses.

Especially for air insulated busbars. Since the gas insulated disconnector 3 and the busbar are connected by bushings, it is preferable that the gas insulated disconnector 5 be placed horizontally.

Next, by vertically arranging the gas tank 5,
An example in which the scale is also reduced in the direction in which the generatrix lines 1 and 2 are juxtaposed will be described.

9 and 10 are front views, respectively, and correspond to the circuit diagram of FIG. 6.

In the embodiment of FIG. 9, on both sides of each busbar 1.2.

The gas breaker 5 is arranged vertically.

A unit consisting of a gas insulation disconnector 3.4 and a bus bar 1.2 is connected to the lower terminal of the gas insulator 5.

Further, the upper terminal of the gas breaker 5 is connected to the gas insulated disconnector 6 and the cable 8 on the opposite side to the lower connection part.

However, if the gas injector 5 is arranged vertically, the lateral dimension can also be reduced, as can be seen from a comparison with FIG. 8 and the like.

The same effect can be obtained even if the unit located between the gas circuit breakers 5 is connected to the upper terminal of the gas circuit breaker 5, and the 1-gas insulation disconnector 6 is connected to the lower terminal of the gas circuit breaker 5.

However, in the embodiment shown in FIG. 9, it is troublesome to separate the gas breaker 5 from other equipment for inspection.

In other words, the gas breaker 5 is connected in the direction of separation from the bus bar 1 (
Since the cable 8 is connected to the left side in the figure,
This becomes an obstacle when attempting to inspect the gas breaker 5 by separating it from others.

The embodiment shown in FIG. 10 is an improvement on this.

This embodiment uses a vertically arranged gas breaker 5 similar to the embodiment shown in FIG.

A unit consisting of busbars 1 and 2 and gas insulated disconnectors 3 and 4 is connected above the gas-insulated circuit breaker 5 on the opposite side thereof.

Further, below the opposite side of the gas breaker 5, a cable 8 is connected/broken via a gas insulated disconnector 6.

According to this embodiment, the axial direction of the gas insulated switchgear can be further reduced/h.

Also, when inspecting the gas circuit breaker 5, move the gas circuit breaker 5 to the outside.

This can be done separately from other equipment.

In FIGS. 9 and 10, the gas breaker 5 and the gas insulated disconnector 6 are configured using separate containers, which is different from the embodiment shown in FIGS. 4 to 8, but the latter implementation is different from the embodiment shown in FIGS. In the example as well, the gas insulated disconnector 5 can be configured separately from the gas insulated disconnector 6, and the gas insulated disconnector 6 can be replaced in the position of the gas insulated connection conductor 11 in each embodiment.

Note that this disconnector 6 may be omitted depending on the difference between the line side and the power supply side.

In the above-described embodiments, it was mentioned earlier that the gas-insulated bus 1゜2 can be of the phase-separated type, but conversely, it is also possible to make the disconnector or breaker of the 3-phase-discharge type to match the bus. You can also do it.

In addition, in order to take advantage of the advantages of the embodiment of FIG. 10 in the embodiment of FIG.

At this time, the equipment on the busbar side gets in the way of the cable 8.

To avoid this, for example, the devices connected to the opposite side of the gas breaker 5 may be connected in slightly different directions above and below.

As explained above, the present invention adds one new gas insulated bus bar and configures the feeder gas insulated switchgear on both sides of these juxtaposed bus bars, so the installation area can be reduced in the axial direction of the bus bar. At the same time, the required length of the busbar can be shortened.

[Brief explanation of drawings]

~Figure 1 is a partial single-phase wiring diagram of one configuration example of a substation, Figures 2 and 3 are front and plan views of a conventional gas-insulated switchgear corresponding to Figure 1, and Figures 4 and 3 are 5 is a front view and a plan view showing an embodiment of the gas insulated switchgear of the present invention, FIG. 6 is a three-phase wiring diagram corresponding to FIGS. 4 and 5,
FIGS. 7 to 10 are front views showing other different embodiments of the present invention. Explanation of symbols, 1... Gas insulated bus bar, 2...
...Gas insulated bus bar, 3...Gas insulated disconnector, 4
...Gas insulated disconnector, 5...Gas breaker, 8...Cable.

Claims (1)

[Claims] 1. A gas insulated switchgear for a feeder, which has a plurality of gas insulated busbars arranged side by side on substantially the same horizontal plane, and has a gas insulator and a gas insulated disconnector, is arranged side by side in the axial direction of the gas insulated busbars, and In the system to be introduced, the gas insulated busbars include three sets of electrically identical busbars, a busbar located in the center and a busbar located on the left and right sides of the busbar FJ'! placed on the same horizontal plane,
Left and right gas insulated buses and feeder gas insulated switchgear are arranged symmetrically on both sides of the central gas insulated bus, and each feeder gas insulated switchgear is connected to two gas insulated buses 1 located at the center and left and right. A gas side edge switchgear characterized in that the corresponding feeder gas insulated switchgear is connected via a gas insulated connecting conductor.