JPH019205Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coupling structure between a power switchgear and an arrester for integrating the power switchgear and the arrester.

Generally, in a power control device, one electrode side of a power switchgear and an arrester are often connected to each other. In this case, if the arrester is installed at the bottom of the power switchgear and stacked on top of each other to form an integral structure, the installation and electrical connection of the device will be simple, and there will be an advantage that the installation space will be small. FIG. 1 shows a conventional example in which a gas insulated switchgear and an arrester are integrated.

In FIG. 1, the grounded lower capsule 1 has a working hole 2 which is permanently closed with a cover 3 and is filled with the same gas as that contained in the upper capsule 5. A cylindrical arrester 4 is installed at the bottom of the capsule 1. Further, a capsule 5 is stacked and coupled to the upper part of the capsule 1, and a gas insulated switchgear (not shown) is housed therein. In this gas insulated switchgear, one electrode side terminal 6 penetrates an insulating plate 7 and projects into the lower capsule 1. The arrester 4 is electrically and mechanically connected to the terminal 6 of the switchgear by tightening a cylindrical conductor 8 provided at the top with a bolt 9. In the gas-insulated switchgear, the main conductor connected to the above-mentioned one electrode side terminal 6 passes through the upper capsule 5 and is connected to the electric line via a disconnector, and the electric wire is connected in the same way to the other electrode side. Open and close between the road and the road. A surge such as a lightning strike occurring on the electric line is discharged from the terminal 6 to the ground by the arrester 4 via the conductor 8.

When performing a withstand voltage test on such switchgear,
The electric line connected to the switchgear is configured so that it can be easily disconnected using a disconnector, but the arrester 4 has a terminal 6 on the switchgear side and the conductor 8 connected to the bolt 9.
Therefore, in order to perform a withstand voltage test, first remove the gas from the capsule 1, and then remove the cover 3.
After opening the bolt 9 and removing the arrester 4 along with the capsule 1 using the working hole 2, cover the terminal 6 with the shield 10 as shown in FIG. 1 must be covered with a separately prepared cover 11, and the gas must be filled in again. Therefore, the withstand voltage test of this switchgear is extremely troublesome. Of course, it is also possible to insert a disconnector between the switching device and the arrester, but this would make the device complicated and large. Arresters are made by stacking many elements and are vulnerable to vibration shock, so the upper part of the arrester and the terminals on the switchgear side are connected and fixed by a cylindrical conductor, but in this way, the elements are stacked in long and thin strips. The disadvantage is that it cannot absorb the longitudinal thermal expansion of the arrester.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coupling structure between a power switchgear and an arrester that can eliminate the above-mentioned drawbacks, facilitate the withstand voltage test of the power switchgear, and absorb the thermal expansion of the arrester.

The purpose of this is to provide a coupling structure for integrating a power switchgear and an arrester, which includes a flexible conductor having connecting terminals at both ends, and a flexible conductor having both ends fixed to the terminal portion of the switchgear and the arrester, respectively. The connection terminal is electrically connected to the terminal part and the conductor part, respectively, and the terminal part and the conductor part are connected to the terminal part and the conductor part, respectively, at both ends of the connection fitting. This can be achieved by fitting the connecting fitting and the conductor part together.

Next, embodiments of the present invention will be described in detail based on the drawings. In FIG. 3, a cylindrical arrester 4 is installed at the bottom of a grounded lower capsule 1 that has a working hole 2 covered with a cover 3, and a cylindrical conductor part 8 is installed at the top of the arrester 4. It is being An upper capsule 5 is stacked and coupled to the upper part of the lower capsule 1, and one electrode side terminal 6 of a gas insulated switchgear (not shown) housed in this capsule 5 is attached.
The structure is completely the same as that of the conventional structure shown in FIG. Also, since the connection to the external electric line of the switchgear and its operation are the same, this part will be omitted.

The connection structure between the power switchgear and the arrester according to this invention is different from the conventional one in that the flexible conductor 1 has connection terminals 12a and 12b at both ends.
One end 12a of 2 is screwed to the terminal 6, and the other end 12a is screwed to the terminal 6.
b is electrically connected to the conductor 8 by screwing it, and the terminal part 6 is fitted into the upper end of the cylindrical connecting fitting 13, and the conductor 8 is further fitted into the lower end, and only the lower end is connected with the screw 14. This is a fixed and mechanically connected configuration. In this way, the connecting fitting prevents the arrester from lateral vibration, and the vertical expansion and contraction of the arrester due to thermal expansion is absorbed by the sliding between the terminal and the connecting fitting. Further, the terminal and the conductor portion are electrically connected by the flexible conductor, and the flexibility of the flexible conductor allows the arrester to expand and contract.

When performing a withstand voltage test on a switchgear, remove the cover 3, remove the sealed gas, and insert the screw 14 from the working hole 2.
Loosen the connector and push down the connecting fitting 13 as shown by the chain line to remove the flexible conductor 12. Since the arrester 4 is thus separated from the switchgear, the withstand voltage test of the switchgear can be performed without removing the arrester 4 by closing the working hole 2 again with the cover 3 and filling it with gas.
Once the test is complete, the device can be returned to service by reversing this process.

As described above, according to the present invention, a power switchgear and an arrester installed at the bottom of the power switchgear and coupled to the switchgear are mechanically coupled by a connecting fitting so that the arrester is expandable and retractable. It prevents lateral vibration of the arrester and absorbs expansion and contraction due to thermal expansion of the arrester. Further, since the electrical connection is made by a flexible conductor, the expansion and contraction of the arrester will not be hindered. Furthermore, by lowering the connecting fitting and removing the flexible conductor, the power switchgear and the arrester can be electrically disconnected easily, and the withstand voltage test of the switchgear can be performed without removing the arrester and its capsule. This is an excellent coupling structure between a power switchgear and an arrester.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the coupling structure of a conventional gas-insulated switchgear and an arrester, Fig. 2 is a partial cross-sectional view showing the structure when conducting a withstand voltage test on the switchgear shown in Fig. 1, and Fig. 3 FIG. 2 is a sectional view showing a coupling structure of a gas insulated switchgear and an arrester according to the present invention. 4... Arrester, 6... Terminal part of switchgear, 8... Conductor part of arrester, 12... Flexible conductor, 12a, 12
b... Connection terminal for flexible conductor, 13... Cylindrical connection fitting.

Claims (1)

[Scope of utility model registration request] A coupling structure for integrating a power switchgear and an arrester, which comprises a flexible conductor having connection terminals at both ends, and a conductor portion having both ends fixed to a terminal portion of the switchgear and the arrester, respectively. The connection terminal is electrically connected to the terminal portion and the conductor portion, respectively, and the terminal portion and the conductor portion are respectively fitted into both ends of the connection metal fitting. A coupling structure for a power switchgear and an arrester, characterized in that the coupling fitting and the conductor portion are fixed.