JPH0223049Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a gas-insulated switchgear in which components together with insulating gas are housed in a rectangular outer shell container.

[Prior art]

Conventionally, there has been a gas insulated switchgear of this type as shown in FIG. In Fig. 1, 1 is a circuit breaker, and 2 is a disconnect switch. In the figure, the one placed in the upper position is the bus-side disconnect switch that is directly connected to the main bus, which will be described later, and the one placed in the lower position. This is a line-side disconnect switch that is connected to the line via a cable head, which will be described later. 3 is a grounding switch, 4 is an instrument current transformer, 5 is a cable head, 6 is a main bus bar, 7 is a connecting conductor, 8 is an insulating gas, and 9 is the disconnector 2 which is a component of this device. It is a rectangular outer shell container that collectively houses an earthing switch 3, an instrument current transformer 4, a cable head 5, a main bus 6, and a connecting conductor ⁷ . The space below is filled with an insulating gas 8.

As can be seen from FIG. 1, in the conventional gas-insulated switchgear, the main bus 6 is arranged in the same section as the disconnecting switch 2, the earthing switch 3, and other component devices. Therefore, in order to increase the capacity of the main bus, it is necessary to reduce the temperature rise of component devices such as the disconnector 2, the earthing switch 3, and the connecting conductor 7 in the same section due to the influence of the temperature rise of the main bus 6. There is a problem that the value exceeds the standard value, and for this reason, the conductor size of each component and the connecting conductor 7 must be made larger than necessary.
Another disadvantage is that the rectangular outer shell container 9 must be made of a non-magnetic material such as stainless steel or aluminum.

[Summary of the idea]

This idea was made in order to eliminate the drawbacks of the conventional ones as described above, and among the component equipment, the main busbar and busbar side disconnector are placed in a metal container independent of the rectangular outer shell container. The object of the present invention is to provide a gas insulated switchgear in which the capacity of the main bus bar can be easily increased by installing the metal container above a rectangular outer shell container.

[Example of idea]

An embodiment of this invention will be described below with reference to FIG. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts, and the explanation will be omitted. Reference numeral 10 denotes an independent metal container that houses the main busbar 6 and the busbar side disconnector 2. The metal container 10 is installed on top of the rectangular shell container 9, and the metal container 10 is cylindrical or has a substantially long cross section. It has a circular cylindrical shape with 5Kgf/
Filled with insulating gas below cm ² (gauge pressure).

As shown in the figure, the reason why the main busbar 6 and the busbar side disconnector 2 are combined together is that they are directly configured with each other, so by configuring them as one unit, they can be made extremely compact. This is because it is possible. Furthermore, by opening this bus-side disconnector 2, it becomes possible to inspect or repair the components inside the rectangular outer shell container 9 while making use of the main bus 6.

When the main busbar 6 and the busbar-side disconnector 2 are configured independently as described above, the surface area (cooling area) for the amount of heat generated by the metal container 10 can be increased,
A great cooling effect can be expected. Furthermore, since the metal container 10 is disposed at the upper part, the temperature rise in the main bus bar 6 does not affect other members, and the size of the conductor of each of the other components can be reduced.

Furthermore, if the metal container 10 is made into a cylindrical shape, the mechanical strength will be increased, so by increasing the pressure of the filling gas higher than the gas pressure inside the rectangular shell container 9, the dielectric strength inside the container will be increased, and the dielectric strength within the container will be increased by that amount. The metal container 10 can be made smaller by reducing the insulation distance.
Further, since the rectangular outer shell container 9 does not house the main bus bar 6 to which a large current flows, for example, common steel materials can be used, and costs can be reduced compared to conventional materials.

This invention can also be applied to gas-insulated switchgears for the main bus of single-bus, double-bus, and three-phase all-in-one bus systems.

[Effect of idea]

As explained above, according to this invention, the main busbar and the busbar-side disconnect switch are installed inside the metal container to be independent from the rectangular outer shell container, and are also installed on the top of the rectangular outer shell container. Even when increasing the capacity of the busbar, the gas insulated switchgear can be arranged compactly and inexpensively, and it is also possible to inspect the component equipment inside the rectangular shell container while making full use of the main busbar.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view showing a conventional gas insulated switchgear, and FIG. 2 is a sectional side view showing a gas insulated switchgear according to an embodiment of the invention. 1... Circuit breaker, 2... Busbar side and line side disconnector, 3... Earthing switch, 4... Instrument current transformer, 5
... Cable head, 6 ... Main bus bar, 7 ... Connection conductor, 8 ... Insulating gas, 9 ... Rectangular outer shell container, 1
0...Metal container. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Components such as track side disconnectors and grounding switches are housed in a rectangular outer shell container, and the upper part of the rectangular outer shell container is independent from the above rectangular outer shell container. A gas insulated switchgear characterized in that a main busbar and a busbar side disconnector are housed inside a metal container installed in a metal container, and both containers are filled with an insulating gas. (2) The rectangular outer shell container is filled with insulating gas at a pressure of 2 kgf/cm ² (gauge pressure) or less, and the metal container is cylindrical or has an oval cross section and is filled with an insulating gas of 2 kgf/cm ² (gauge pressure) or less inside. Or, the gas insulated switchgear according to claim 1, which is filled with an insulating gas of 3 to 5 Kgf/cm ² (gauge pressure). (3) The gas insulated switchgear according to claim 1 or 2, wherein the main bus bar system is a single bus system or a double bus system, and is a three-phase all-in-one type.