JPH0126242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas-insulated switchgear in which various types of switches are constructed in a sealed container filled with an insulating gas, and particularly to a gas-insulated switchgear having an air-insulated double bus bar.

Gas-insulated switchgear consists of a switch such as a disconnector or a shield switch in a container filled with insulating gas.By using insulating gas, it can be used as an air-insulated switchgear. It is possible to make the structure significantly smaller in comparison. As the insulating gas, SF ₆ gas, which has excellent insulating properties, is generally used.

However, gas-insulated switchgears tend to be more expensive than conventional air-insulated switchgears. This is because a container filled with an insulating gas and an insulating support means to be supported within the container are required. Therefore, in this type of switchgear,
Efforts are being made to reduce the number of containers. We are also considering a switchgear that partially uses air insulation. For example, it is considered that the main bus bar is air-insulated, the switchgear is gas-insulated, and the two are connected by bushings.

An object of the present invention is to provide a gas-insulated switchgear in which the connection busbars and the disconnectors can be easily maintained and inspected by properly arranging the connection busbars and the disconnectors at each end of the connection busbars arranged in parallel. It is in.

The present invention uses an air-insulated main bus, the other parts are gas-insulated, and the two are connected by bushings. The unit on the power transmission line side and the unit on the transformer side are integrally constructed. In these complex configuration switchgears, the breaker is arranged in a straight line. Since the main structure is arranged along the straight line and the three phases are arranged side by side, the space between the phases can be used without waste, and maintenance and inspection can be performed from this space.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 is a perspective view of a gas-insulated switchgear, and the main busbar of the air-insulated type is not shown. 3
Since they have the same configuration, only one arbitrary phase will be explained.

Three bushings 1, 2, and 3 are established on the same straight line. The bushing 1 at the end is connected to a power transmission line. The other bushings 2 and 3 are each connected to a double main bus bar (not shown).
The double main busbars are arranged parallel to the phase direction of the gas insulated switchgear. Looking at gas insulated switchgear,
Its main configuration is on the straight line of arrangement of the bushings. A power transmission line side disconnector 4 is disposed between the bushings 1 and 2, and a connection bus bar 5 is provided between the bushings 2 and 3. Each bushing 1-3
The lower containers constitute disconnectors 6, 7, and 8, respectively. One end of the disconnector 6 is connected to a power transmission line, and the other end is connected to one end of the disconnector 4. One end of the disconnector 7 is connected to the other end of the disconnector 4 and one end of the connection bus bar 5, and the other end is connected to one main bus bar via the bushing 2. Further, one end of the disconnector 8 is connected to the other end of the connecting bus 5, and the other end is connected to the other main bus through the bushing 3.
These constitute a feeder unit on the power transmission line side of the circuit. The remaining parts constitute the feeder unit on the transformer 9 side.
The circuit is the same as the power transmission line side. The circuit is the first
The arrangement is as shown in FIG. 2 in accordance with the arrangement shown in the figure.

Next, the feeder unit on the transformer 9 side will be explained. Disconnectors 10 and 11 are juxtaposed to the sides of the disconnectors 7 and 8, respectively. 2 disconnectors 1
0 and 11 are connected by a connecting bus bar 12 that is substantially parallel to the connecting bus bar 5. Double disconnector 1
The other ends of 0 and 11 are connecting bus bars 13 and 14, respectively.
are connected to the main bus bar via bushings 2 and 3, respectively. Transformer side disconnector 15
are arranged on the straight line in which the bushings 1 to 3 are arranged. One end of this sheath disconnector 15 is connected to the connection bus 12 by an L-shaped connection bus 16 . The other end of the disconnector 15 is connected to the transformer 9. Lightning arresters 17 and 18 are connected to both ends of these integrated gas-insulated switchgear.
In particular, the lightning arrester 18 is connected to the transformer 9 using a connection bus 19 whose level has been changed.

In such a configuration, a particularly notable configuration is that the arrangement lines of the connection bus bar 12 and the sheath disconnector 15 have been changed. In order to standardize the equipment, it is important to arrange the breaker 15 on the same straight line as the connection bus 12. However, in this configuration, the bow breaker 15 is arranged on a different axis from the connection bus bar 12, that is, on the straight line in which the bushings 1 to 3 are arranged. This can reduce the installation area in both directions. In other words, the breaker 15
If the connecting bus bar 12 and the connecting bus bar 12 are arranged on the same straight line, the operating device 20 of the shield breaker 15, including the operating device 20, will protrude further in the phase direction, and if space is secured between the phase devices, the size will increase considerably in the phase direction. I end up. Another option is to configure the operating device 20 on the back side of the breaker 15, but if the breaker 4 of the same phase
Otherwise, it becomes impossible to operate the operating device from the passage on the same side, and a great deal of effort is required for maintenance and inspection.

However, the present embodiment described above does not have any of the above-mentioned drawbacks. Maintenance and inspection of the disconnector or operating device can be carried out from the space on one side.

In this embodiment, the connection to the power transmission line is made directly by bushing, but it may also be made via a gas insulated bus bar (GIB). On the other hand, a cable can also be used in place of the connection bus bar 19 on the transformer side. Further, although all the disconnectors are configured in a vertical container, a horizontal configuration may also be used.
The alignment straight line may be shifted. Of course, in the best embodiment, the bushings 1 to 3 and the sheath breakers 4 and 15 are arranged on the same straight line.

As explained above, the present invention connects a connection bus bar with bushings established at the end by arranging a power transmission line side cutter and disconnector on the arrangement line on one side, and A transformer side breaker is placed on the line, and this breaker is connected via an L-shaped connection bus to the other connection bus that is placed in parallel with the connection bus that established the bushing, and connects the pair of bushings and each side and disconnector were placed on the same straight line, so
Maintenance and inspection of the connecting busbar, transmission line side, and transformer side shields and disconnectors can be easily performed, and the space to the side of each shield and disconnector can be effectively used as a place for repair and replacement work. A gas insulated switchgear is obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a gas insulated switchgear according to an embodiment of the present invention, and FIG. 2 is a circuit diagram modified to correspond to the configuration of FIG. 1. 1 to 3...Butsing, 4...Shiya disconnection, 5...
... Connection bus bar, 7, 8, 10, 11 ... Disconnector,
9...Transformer, 15...Shin breaker, 16...L type connection bus bar.

Claims (1)

[Claims] 1 Disconnectors are provided at both ends of each connection bus bar arranged in parallel, and the above disconnectors are connected in a circular manner by a connection busbar, and one end of each is connected to a double main busbar of air insulation type. , has a pair of bushings whose other ends are connected to the connection busbar via a disconnector, and each bushing and disconnector connected to the transmission line and the transformer, respectively, is connected to each end of the connection busbar. , Bushings are established at each end of one of the connection busbars to face each other, and the connection busbar with the bushings has a power transmission line side cutter and disconnector on one side of the connection busbar. At the same time, a transformer-side bow disconnector is placed on the other side's arrangement line, and the transformer-side bow disconnector is placed in parallel with the connecting bus bar on which the bushing has been established. via an L-type connection bus, and connect to the above 1.
A gas insulated switchgear characterized in that a pair of bushings and a disconnector are arranged on the same straight line.