JPH0237205Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a disconnector for a lightning arrester of a gas-insulated switchgear, that is, a lightning arrester for protecting a transformer provided in the gas-insulated switchgear. This invention relates to a lightning arrester disconnector in which the transformer and a gas-insulated switchgear are directly connected via a disconnector for electrical disconnection from the main circuit of the switchgear main body.

[Prior Art] Conventionally, an example of a connection configuration of this type of device is shown in FIGS. 1 and 2. FIG. 1 is a plan view showing a connection structure between a gas insulated switchgear and a transformer, and FIG. 2 is a side view taken in the direction of the arrow - in FIG.

In the figure, symbols 1a, 1b, and 1c are connected at one end to the transformer 2 and at the other end to the switchgear body 3 of the gas-insulated switchgear, horizontally to the base surface 4 and in the longitudinal direction of the switchgear body 3. A bushing 5 is a lightning arrester installed in the switchgear main body 3 to protect the transformer 2, and a disconnector 6 is provided for electrical disconnection from the switchgear main body 3. connected via.

Further, 7a, 7b, 7c are vertical branch busbars, one end of which is connected to the switchgear main body 3, the other end is connected to the disconnector 6, and the other end is connected to the bushings 1a, 1b, 1c. Three connecting portions 7d, 7e, and 7f are provided so that the connecting portions 7d, 7e, and 7f can be connected to each other.

Furthermore, due to the structure of the transformer itself, it is necessary for the transformer 2 to position the connection part 2a with the switchgear main body 3 at a certain height on a vertical line with respect to the foundation surface 4. Therefore, the connection portions 7e of the vertical branch busbars 7a, 7b, and 7c provided in the switchgear main body 3 are all connected to the transformer 2.
It is configured to be at the same height position as a.

In the configuration in which the transformer 2 and the switchgear main body 3 are directly connected via the bushings 1a, 1b, and 1c as described above, the vertical branch bus 7
A main circuit branch device with multiple connections such as a, 7b, and 7c is required, and this increases the complexity of the structure due to the increase in the number of required parts and increases the manufacturing cost due to this. It had shortcomings over the years.

[Summary of the idea]

The present invention was made with the aim of obtaining a lightning arrester for gas-insulated switchgear that eliminates the drawbacks of conventional devices, simplifies the configuration, improves reliability, and reduces manufacturing costs. The present invention provides a disconnect switch for a lightning arrester of a gas-insulated switchgear that achieves the above object by omitting a vertical branch bus bar and having a part of the disconnect switch also serve as a vertical branch bus bar.

[Example of idea]

Hereinafter, the present invention will be explained based on FIGS. 3 to 5 showing one embodiment thereof.

3 is a plan view of a device including an embodiment of the present invention corresponding to FIG. 1, FIG. 4 is a side view of the device taken along the arrow line in FIG. 3, and FIG. The figure is an internal configuration diagram of the disconnector, and is shown in the direction of the arrow in FIG.
FIG. 3 is a cross-sectional view of the disconnector taken along the line;

In the figure, reference numerals 8a, 8b, and 8c are disconnectors having connection parts 8d, 8e, and 8f at three places, and the switchgear main body 3 is connected to the connection part 8d, and the conventional one is connected to the connection part 8f. Similarly, a lightning arrester 5 for protecting the transformer 2 is connected via a disconnecting section 9 provided between the connecting section 8d and the connecting section 8f.

The connecting portion 8e is located at the same height as the connecting portion 2a connecting one end of the bushings 1a, 1b, 1c connected to the transformer 2.
A, 1b, and 1c are provided to connect the other ends thereof, and the connecting portion 8d and the connecting portion 8e are connected by a bus conductor 10. In this way, the disconnectors 8a, 8b, 8c themselves have the function of disconnectors as well as the conventional vertical branch buses 7a, 7b,
It has a configuration that combines the functions that the 7c had.

[Effect of idea]

As described above, the present invention is applicable to gas-insulated switchgear in which the switchgear body equipped with a lightning arrester for protecting the transformer and the transformer are directly connected via bushings. The disconnector that electrically disconnects the main circuit from the main circuit is provided with a disconnection section from the connection section that connects the switchgear main body to the lightning arrester connection direction, as in the past. By combining the functions of the previously installed vertical branch busbar, it is possible to omit the installation of the conventionally installed vertical branch busbar, thereby simplifying the structure of the switchgear main body, and
The reliability of gas-insulated switchgear can be improved, and the period for assembly and installation work, as well as the foundation work to install the switchgear body that is performed before the installation work, can be shortened, and as a result, manufacturing costs can be reduced. This has the effect of providing a disconnector for a lightning arrester of a gas insulated switchgear which has many advantages such as being able to reduce

[Brief explanation of the drawing]

Figure 1 is a plan view showing a conventional gas insulated switchgear connected to a transformer, and Figure 2 is a view taken from the arrow in Figure 1.
Figure 3 is a plan view of a gas insulated switchgear connected to a transformer according to an embodiment of the present invention;
4 is a side view taken along the line shown in FIG. 3, and FIG. 5 is a sectional view taken along the line shown in FIG. 4, showing the internal structure of the disconnector according to the present invention. 1a, 1b, 1c... Bushing, 2... Transformer, 2a, 7d, 7e, 7f, 8d, 8e, 8f
... Connection part, 3 ... Switchgear main body, 4 ... Foundation surface, 5 ... Lightning arrester, 6, 8a, 8b, 8c ... Disconnector, 7a, 7b, 7c ... Vertical branch bus bar, 9 ...
...disconnection section, 10... bus conductor, 11... mount. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A gas insulated switchgear is connected to the transformer via a bushing that can be connected to the primary or secondary side of the transformer, and a lightning arrester is provided to the gas insulated switchgear to protect the transformer. In the gas-insulated switchgear configured by connecting the main circuit of the switchgear body of the gas-insulated switchgear via a disconnector that can be electrically disconnected, one end of the disconnector is connected to the switchgear body of the gas-insulated switchgear. and the lightning arrester is connected to the other end of the disconnector via the disconnection section, and the bushing is connected to the connection section of the disconnector provided at the same height as the connection section of the transformer. 1. A disconnector for a lightning arrester of a gas-insulated switchgear, characterized in that it is configured to be connected to the transformer through the bushing.