JPS6338925B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas insulated switchgear, and in particular to the construction of a main bus bar.

With the recent increase in electricity demand, high-power transmission line networks have been installed, and the transmission line voltage has reached 500KV class.

Due to the high voltage and large capacity, the equipment that makes up the switchgear becomes large and heavy. Therefore, sufficient consideration must be given to the maintenance and earthquake resistance of each piece of equipment.

For gas-insulated switchgear that uses _SF6 gas as the insulating medium, the best configuration to meet the above requirements is to configure the main bus near the ground and place the gas shields and disconnectors horizontally. . The height of gas insulated switchgear can be kept extremely low by arranging gas shields and disconnectors horizontally, but the overall height is The height will be determined. For this reason,
It is necessary to configure this section low.

In this regard, the conventional configuration shown in FIGS. 1 and 2 will be explained.

One end of the horizontally arranged gas shield and disconnector 1 is connected to an insulation lead-out means 2 such as a pushing or cable, and the other end is connected to a main bus 3. This main bus 3 exemplifies a double bus system, and three-phase separated busses U ₁ , V ₁ , W ₁ , U ₂ , V ₂ , W ₂ are attached in parallel near the ground. Disconnectors 4 and 5 are connected between the main busbars 3 and the gas shield switch 1, respectively. It was a system in which the child moved up and down.

Therefore, the height of the disconnectors 4 and 5 determines the overall height. In addition, in order to reduce the number of frames, equipment connected between the gas shield breaker 1 and the A bus line U ₁ and between the A and A main bus lines U ₁ and U ₂ , such as disconnectors 4 and 5, connection conductors, and current transformers for meters, are installed. The vessels, etc. are mainly supported by the main buses U ₁ and U ₂ . This is highly effective in reducing the number of frames, which was the initial objective. However, this meant making the main bus container unnecessarily strong. In other words, as shown in Fig. 2, the bus _W2 consists of a straight bus pipe a and a branch pipe b extending upward at right angles to the bus pipe a. Stress concentration occurs at the connection part of branch pipe b. Therefore, the busbar tube a must be designed and manufactured to withstand this, and the busbar tube a becomes thicker and more expensive than the required pressure vessel.

A gas insulated switchgear which has been improved in this respect has been previously proposed and is shown in FIGS. 3 to 6.

FIG. 3 shows a phase separation configuration. This is a cross-section of only the U phase. The main busbar of the phase-separated configuration is arranged parallel to the attached surface as in Fig. 1, but the sealed container is the disconnector container 1 as seen in Fig. 4.
3a, 13b and dedicated containers 23a, 23b. In addition, between both containers, there is a bellows 2 if necessary.
0 is connected. The right end of the dedicated container 23a is connected to the lower left end of the disconnector container 13b via the insulating spacer 21, and the lower right end of the disconnector container 13b is connected to the dedicated container 23b via the insulating spacer 22 and the bellows 20. Each container 23a,
The bus conductors 10 within 13b and 23b are arranged linearly. In this way, the bus line _U2 is constructed using the sealed containers 13a, 13b of the disconnector 5 and the internal space thereof. Now, looking at the disconnector 5, it is made airtight by the disconnector container 13b, the insulating spacers 21 and 22, and the insulating spacer 26 shown in FIG. 3. The dedicated containers 23a, 23b may be supported and fixed to the attached surface by support legs, respectively, or may be supported and fixed to the attached surface by the disconnector containers 13a, 13b.

In a disconnector container 13 fixed to an attached surface, a stator 11 is fixed to a bus conductor 10 as shown in FIG. It is configured.
This movable element 12 is connected to one terminal of the gas shield and disconnector 1 via a conductor 19, and is electrically connected to the movable element of the disconnector 4. The configurations of the first bus U ₁ on which the bus conductor 17 is arranged and the disconnector 4 are the same as the configurations of the second bus U ₂ and the disconnector 5 described above. Bellows 15 and 18 are provided between the disconnectors 4 and 5 and the gas shield and disconnector 1 as required.

According to this configuration, the main bus bar can be constructed from a simple tubular sealed container 23a, 23b, and there is no need to form a branch part as shown in FIG. becomes easier. Moreover, the heights of the disconnectors 4 and 5 can be made lower than in the case of FIG. 1, and at the same time, the height of the gas cylinder and disconnector 1 can be suppressed. Moreover, disconnector container 1
3 and 16 are self-supporting types, so their weights are not added to the main busbar.

FIG. 5 shows the disconnector container 13, and the connection part 50 with the dedicated container 23 for the bus line _U2 is shown below.
51, and has a connecting portion 52 with the connecting conductor 14 shown in FIG. 3 above. This connecting portion 52 is conductive in a direction perpendicular to the connecting portions 50 and 51.

FIG. 6 shows the disconnector container 16, and the fifth
In addition to the configuration of the disconnector container 13 shown in the figure, a connecting portion 53 is added.
is added, and this connection part 53 is connected to the connection part 52
It is formed on the same axis as the

If the one shown in FIG. 6 is used as the disconnector container 13 and the connecting portion 53 is sealed with an end cap, only one type of disconnector container is required.

Configuring the disconnector containers 13 and 16 for the disconnector independently of the busbar tube of the main busbar means that the dedicated container 23 can be prepared according to manufacturing and transportation conveniences.

In the above-mentioned improved gas insulated switchgear, the present invention aims to provide a gas insulated switchgear having a simpler main bus configuration, in which the container of the main bus is replaced with a dedicated container having a linear configuration, and a main bus having a substantially vertical main body. This configuration is constructed by connecting in series with a disconnector container having a main bus container of the same phase, and one insulating spacer is provided between the disconnector containers in the main bus container of the same phase.

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

Fig. 7 shows the present invention applied to a bidirectional pull-out system in which feeder units are arranged on both sides of the main bus bar.Since the feeder unit has the same structure as Fig. 3, the explanation of this unit will be omitted. ing. The difference from the system shown in FIG. 3 will become clear by comparing the configuration of the main bus shown in FIG. 4.

In the example shown in FIG. 7, each phase has the same configuration, so the U phase will be explained.

The main bus line has a first bus line _U1 and a second bus line _U2 , which are provided in parallel at the same level. Each bus bar U ₁ and U ₂ are connected to disconnector containers 13 and 1, respectively.
6' and 16, 13'. Focusing on the configuration between each bus bar U ₁ , U ₂ and the gas shield disconnector, the gas shield disconnector 1U, 1U' and the disconnector containers 13, 13', 16, 16' are fixed to the attached surface, and the other The connecting conductors 14, 14', etc. are supported by these main devices. The dedicated container 23 constituting the main bus bar may be supported at one end by the disconnector container 13, 16', or may be supported by independently provided support legs.

As you can see from this figure, the main busbar does not form a branch pipe above the busbar pipe and connect a disconnector container to the branch pipe as in the past, but instead has a disconnector container and a container dedicated to the main busbar. Since they are connected in series to form the main bus tube, the disconnector containers for each phase can have the same structure regardless of the axial length of the main bus tube or the distance between the phases.

In addition, one of the features of this embodiment is that a system is adopted in which the gas shields, disconnectors 1U, 1U', etc. that make up the feeder unit are arranged on both sides of the main bus bar. The point is that the configurations represented by are brought closer together. The disconnector containers 13, 16' are
The connecting portions 50 and 51 shown in FIGS. 5 and 6 are connected to each other with an insulating spacer interposed therebetween, as will be described later. In the conventional configuration, the disconnector and the connecting conductor 1
Because a load such as 4 was applied to the bus tube, it was not possible to configure the branch tube close to the bus tube due to strength reasons. However, according to this embodiment, since each disconnector can be made independent, a close arrangement is possible. This point will be further explained with reference to FIG. A connecting portion 50 formed on the opposing portions of the disconnector containers 13, 13',
51 are directly connected via one insulating spacer 80. In other words, there is no container dedicated to the main bus bar interposed between the disconnector containers. Therefore, the two disconnector containers 13, 13' can be disposed close to each other to form a configuration as shown in FIG. 7. Additionally, this configuration can reduce the number of insulating spacers and simplify the configuration of the main bus bar. This effect can also be obtained with a configuration as shown in FIG. This example is applied to a general system in which feeders are arranged for each three phases in a bidirectional drawer as shown in Fig. 7, and as in the case of Fig. 8, one plate is placed between the disconnector containers 13 and 13'. Only insulating spacers 80 are provided. Since the main bus bar dedicated container 23 is connected between the disconnector containers, the axial length of the main bus conductor 10 becomes long, and it may be difficult to support it. This point is the same in the embodiment shown in FIG. 8, but it can be solved by supporting the conductor 10 midway with a columnar insulator such as a supporting insulator.

In the above embodiment, an example in which the main bus bar is configured as a phase-separated type has been described, but it can also be applied to a three-phase integrated type. In addition, the above example is 2
Although the explanation has been given using a multi-bus system as an example, it can also be applied to a single-bus system. It is also possible to apply the system to a system in which the opening/closing unit is arranged only on one side of the main bus bar, a system in which the switching unit is arranged for each three phases, and the like.

As explained above, in the present invention, the load of the disconnector is not applied to the dedicated container constituting the main busbar, so the main busbar is not required to have unnecessarily high strength. In addition, since the disconnector is a self-supporting type and is supported and fixed to the attached surface, the disconnector can be arranged close to the main busbar in the axial direction. In addition, the configuration of the main bus bar can be simplified by providing only one insulating spacer for the two disconnector containers.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional gas insulated switchgear, Fig. 2 is a side view taken from the - line in Fig. 1, Fig. 3 is a partially sectional front view of the previously proposed gas insulated switchgear, and Fig. 4 is a front view of a conventional gas insulated switchgear. The figure is a partial cross-sectional side view taken from the line - in FIG. 3, FIGS. 5 and 6 are perspective views showing the disconnector container of FIG. 3, and FIG. 7 is a gas insulation according to an embodiment of the present invention. FIG. 8 is an enlarged sectional view of the main part of FIG. 7, and FIG. 9 is a sectional view of the main part according to another embodiment. 1, 1U, 1U'...Gas shield disconnector, 3...Main bus bar,
4, 5... Disconnector, 10... Bus bar conductor, 13, 13',
16, 16'...Container for disconnector, 14,14'...Conductor for connection, 23...Special container, 50-53...Connection part,
80...Insulating spacer.

Claims (1)

[Claims] 1. A main bus line extending linearly and arranged;
Gas shields and disconnectors for each phase are arranged along a horizontal line substantially perpendicular to the main bus, and a plurality of units connect the main bus and the gas shields and disconnectors for each phase via disconnectors, respectively. The above-mentioned disconnecting switch has a substantially vertical main body portion having a disconnecting section therein, and a pair of connecting portions located below the main body portion and formed on the same axis as the main bus bar. In the case where the container for the main bus bar is a self-standing type installed on an attached surface equipped with a container for disconnectors, and the container for the main bus bar is composed of a plurality of containers for disconnectors and a dedicated container connected to this connection part, the container for the main bus bar is A gas insulated switchgear characterized in that one insulating spacer is provided between the disconnector containers forming a part of the containers for gaseous separation. 2. The gas insulated switchgear according to claim 1, wherein the insulating spacer between the disconnector containers is sandwiched between opposing connecting portions of the disconnector containers.