JPS6341784Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a gas insulated switchgear that allows for easy pressure testing.

1 and 2 show a conventional gas insulated switchgear. Conventionally, when performing a pressure test of a gas-insulated switchgear, as shown in FIG.
is attached to the attachment opening 1a of the first container 1, and a bushing 16 is provided at the other end of the connection container 20 so as to be connected to the connection conductor 18. Then, the first container 1 and the connection container 20 are filled with insulating gas, and a test voltage is applied through the bushing 16 to perform a test.

After the test is completed, the first container 1 and the connecting container 20
The connecting container 20 is removed from the first container 1, the attachment port 1a is closed with a lid 21 as shown in FIG. 2, and the first container 1 is filled with insulating gas.

As described above, in the conventional device, when performing a pressure test, a large amount of the insulating gas in the first container 1 must be recovered and sealed again, and the connection container 20, the connection conductor 18, etc. are required. There was a drawback.

This idea was made to eliminate the above-mentioned drawbacks, and it is possible to apply a test voltage by inserting a bushing into the second container, which is fixed to the first container that houses the electrical equipment and houses the lightning arrester element. By doing so, it is possible to provide a gas insulated switchgear capable of performing a pressure resistance test without recovering the insulating gas in the first container.

The figures will be explained below. In Figures 3 to 6, 1 is a first container installed on a pedestal 2;
Filled with insulating gas. 3 is the cable first
4 is a current transformer, 5 is a disconnector, one end is connected to the cable terminating terminal 3 via the connecting conductor 6, and the other end is connected to the connecting conductor 7.
It is connected to the bus bar 8 via. Reference numeral 9 indicates an insulation soother that partitions the equipment room and the busbar room, 10 indicates a grounding device, and 11 indicates a second container provided in the first container 1 and having an opening, and a connecting portion with the first container 1. is constructed airtight. 12 is a mounting base provided by closing the opening 11a, and 13 is a second container 11.
a lightning arrester element housed in and fixed to the mounting base 12;
A terminal 14 is airtightly provided in the second container 11, and one end thereof is connected to the connecting conductor 6. 15 is a contact, one end of which is connected to the terminal 14 and the other end of which is connected to the lightning arrester element 13. A bushing 16 has one end inserted into the second container 11 through the opening 11a and connected to the contact 15. Reference numeral 17 denotes a lid that closes the opening 11a, through which a bushing 16 passes.

When performing a withstand voltage test on gas-insulated switchgear, one end of the bushing 16 is inserted into the second container 11 and connected to the contact 15, as shown in FIGS. 3 and 4, and the opening is closed with the lid 17. 11a is closed, and the second container 11 is filled with insulating gas. Then, a test voltage is applied from the bushing 16 to the terminal 14.

When the withstand voltage test is completed, the insulating gas in the second container 11 is recovered, and the bushing 16 and lid 17 are removed as shown in FIG. Then, as shown in FIG. 6, one end of the arrester element 13 is attached to the mounting base 1.
2, the lightning arrester element 13 is housed in the second container 11, and the other end is connected to the contact 15. and,
The second container 11 is filled with an insulating gas.

In addition, in the above embodiment, a second container is placed on the ceiling of the first container 1.
Although the description has been given of a case in which a second container 11 is provided and the opening 11a is located upward, the present invention is not limited to this and may be applied to a case in which a second container 11 is provided such that the opening 11a is arranged on the side surface of the container 1. is also effective.

As described above, according to this invention, the lightning arrester element is stored in the second container provided in the first container housing the electrical equipment, and the bushing is connected using the terminal to which the lightning arrester is connected. Since it is now possible to apply a test voltage, it is possible to apply a test voltage to a gas-insulated electrical device and perform a test without recovering and re-filling the insulating gas in the container.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the state of a conventional gas insulated switchgear during a pressure test, Figure 2 is a sectional view showing the state after the test in Figure 1 is completed, and Figure 3 is a pressure test of an embodiment of this invention. 4 is a sectional view showing the state of connection between the bushing and the terminal in FIG. 3, FIG. 5 is a sectional view showing the state in which the bushing is removed from FIG. 3, and FIG. FIG. 4 is a sectional view showing the assembled state of the lightning arrester in FIG. 3; In the figure, 1 is a first container, 5 is a disconnector, 11 is a second container, 11a is an opening, 12 is a mounting base, 13
1 is a lightning arrester element, 14 is a terminal, and 16 is a bushing. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A switching device is housed in a first container filled with an insulating gas, and a second container having an opening into which a lightning arrester element can be taken out and a test bushing can be inserted is fixed to the first container. The second container contains a lightning arrester element and is airtightly connected to the first container.
A gas insulated switchgear characterized in that a terminal is provided which protrudes into the container and connects the switch and the lightning arrester element, and to which the bushing can be connected when the lightning arrester element is taken out.