JPS6138330Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a tank-type gas insulated switchgear.
The present invention relates to a centering device that facilitates connection between an arc extinguishing chamber side conductor and a bushing conductor in a tank.

Conventionally, for example, in the case of an arc breaker, the arc extinguishing chamber 2 is attached to the arc extinguishing chamber mounting base 1a of the tank 1 as shown in Fig. 1, and the tank 1 is closed with a lid 3, in which case the inner diameter of the tank 1 is Due to the large size, the operator puts his hand inside the tank and visually confirms the position of the connection inside the tank, and connects the bushing conductor 4 to the arc extinguishing chamber side conductor 2a.
was connected. In addition, when the tank 5 has a small inner diameter as shown in FIG. 2, the lid 6 must be removed to visually inspect the inside while working.

However, although it is relatively easy to center the bushing conductor connection part with vertically mounted bushings like these, it is still necessary to provide a window in the tank to at least visually check the connection part, and it is also very expensive. type, it is necessary to install an arc chamber mounting stand inside the tank. On the other hand, if the tank is small, it is difficult to provide a window for visibility.
Furthermore, in the case of a structure in which the bushing is mounted at an angle, the center of gravity is unstable during connection, so centering is extremely difficult.

The present invention eliminates these drawbacks and makes it possible to easily and reliably center the connecting part between the bushing conductor and the internal conductor, which cannot be seen from the outside, inside the tank. Explain in detail.

In FIG. 3, reference numeral 11 denotes a grounded tank whose left and right ends are hermetically closed by lids 12 and 13, respectively, and gas bushings 14 and 15 are installed at the top at an angle. Inside the tank 11, a conductor section 16 on the fixed contact side is fixed to the left end lid 12 via an insulator 17, and a bushing conductor 18 of the gas bushing 14 is connected to the conductor section 16.
On the other hand, the arc extinguishing chamber 19 is fixed to the right end lid 13 via a cylindrical insulator 20, and the bushing conductor 21 of the gas bushing 15 is connected to a movable contact side conductor (not shown) in the arc extinguishing chamber. In addition, arc extinguishing room 1
From 9, an insulated operating rod 22 for driving a movable contact passes through the cylindrical insulator 20 and the lid 13 and is led out to the right, and a small compartment 13 is airtightly attached to the outside of the lid 13.
is coupled to a drive mechanism (not shown) within a.

In such a structure, the gas bushing 14,
15 is inclined with respect to the grounded tank 11, so
Although it is particularly difficult to connect the bushing conductors 18 and 21 to the fixed contact side conductor 16 and the movable contact side conductor in the arc extinguishing chamber 19, in the present invention,
This can be done very easily and accurately as follows. In the following description, for the sake of simplicity, the case of one bushing conductor 18 will be explained.

FIG. 4 is a cross-sectional view of the gas bushing 14 and the terminal block 23 at the upper end in the direction of the arrow (gas bushing 1
Fig. 4 shows a plan view of the central axis of Fig. 4. Here, a terminal block 23 is fixed to the insulator flange 24 on the upper part of the gas bushing 14 with bolts 25.
3 is provided with a terminal 23a for connecting an external conductor, and a bushing conductor 18 is attached to the bushing by passing through the inside of the bushing. The bushing conductor 18 has a guide 18a at the lower end and a tulip contact 1.
8b and an outer shield 18c are attached, and the contact 16a of the fixed contact side conductor part 16 is attached.
is engaged in.

Screw hole 24 for bolt 25 of insulator flange 24
In the case shown in the figure, there are eight through holes 23b in each of the terminal blocks 23a and 23b in the terminal block 23.
As shown by hatching in the plan view of No. 3, for example, four pieces are used. That is, as shown in Fig. 5, a stud 26 is installed instead of a bolt in the screw hole of the insulator flange at a position corresponding to the hatched through hole of the terminal block 23, and bolts are removed from the other screw holes. . Next, nut 26 is placed on stud 26.
The lifting platform 27 is fixed by a. This lifting stand 27 is provided with a threaded rod 28, and the hanging fitting 23c of the terminal block 23 is connected to the freely rotatable tip with a pin or the like, and the threaded rod 28 is rotated with a ratchet handle 28a to move it up and down. , the terminal block 23 can be lifted or suspended together with the bushing conductor 18.

In this case, the outer diameter of the stud 26 is sized to match the inner diameter of the bolt through hole 23b of the terminal block 23, and the terminal block 23 can move up and down with respect to the stud 26 without play. Therefore, when the terminal block 23 is lowered by rotating the ratchet handle 28a from the lifted terminal block 23 as shown in FIG. The contact 16 on the fixed contact side moves downward along the
Correct centering is performed between the contact point 18a and the tip contact 18b, and the contact 16a is accurately connected.

In addition, as shown in FIG. 6, the stud 26 has
Green mark 2 to indicate the position of the tube contact 18b at the tip of the bushing conductor in advance
6b and red mark 26c, and connect the terminal block 2.
When the lower edge of the terminal block 23 matches the green mark 26b as shown in FIG.
6a, and at this point the terminal block 23 is stopped so that the fixed side contactor (or the arc extinguishing chamber 19 in the case of the gas bushing 15) in Fig. 3 can be taken out of the tank and inspected. Make it. Also, if the terminal block 23 is hung after internal inspection, the lower edge of the terminal block 23 will be marked with red mark 26c.
When it reaches this point, it indicates that the tube contact 18b has approached the contact 16a, and from now on, the terminal block 23 can be lowered to the insulator flange 24 with care. Note that when hanging the terminal block 23, the bushing conductor 18
The inclination can be adjusted to ensure perfect centering.

In this way, the terminal block 23 is attached to the insulator flange 24.
After that, insert the bolt 25 into the through hole 23b of the terminal block 23 other than the one through which the stud passed through and tighten and fix the terminal block to the insulator flange. Then, remove the stud 26 and attach the bolt 25 to completely fix the terminal block. do.

In this way, the bushing conductor 18 is lifted and properly centered before being attached, and the other bushing conductor 21 can be removed and attached in the same manner. In addition, in the above explanation, the bolt screw hole 2 of the insulator flange 24
4a to install the stud 26,
If the insulator flange 24 has a through hole for a bolt instead of a screw hole, a stud can be attached to this using a nut.

The effects of the present invention can be summarized as follows.

(1) During restoration after pulling out and inspecting the contacts, arc extinguishing chamber, etc. in the tank at the site, centering when installing bushing conductors is done quickly and accurately, especially when bushings are installed at an angle in the tank. The effect is large if

(2) Since there is no need to reach into the tank to check, the inner diameter of the tank can be made smaller, and the tank does not require a window to view the inside or a lid to airtightly close it. .

(3) Similarly, there is no need to check inside the tank;
The arc-extinguishing chamber does not necessarily need to be installed by providing an arc-extinguishing chamber mount inside the tank, and can be attached directly to the lid of the tank.

As explained above, according to the present invention, it is possible to easily and accurately connect the bushing conductor in a tank-type gas insulated switchgear, which was extremely difficult in the past, and the effect is great.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 are schematic sectional views showing each conventional example, Fig. 3 is a schematic sectional view showing an embodiment of the present invention, and Fig. 4 shows a state in which the bushing conductor of the gas bushing is connected to the stationary conductor. 5 is a sectional view showing an embodiment of the present invention, and FIG. 6 is a partial sectional view showing a state in which a stud is attached to the insulator flange in FIG. 5. 14, 15... Gas butsing, 18, 21...
...Bushing conductor, 23...Terminal block, 23b...
Through hole, 24... Insulator pipe flange, 24a... Screw hole, 25... Bolt, 26... Stud, 27...
...Lifting stand, 28...Threaded rod.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a bushing in which a terminal block is fixed to an insulator flange at the upper end with bolts, a plurality of studs are attached to the bolts using screw holes or through holes of the insulator flange, and a plurality of studs are attached to the studs. The terminal block includes a fixed lifting stand and a threaded rod provided in a screw hole of the lifting stand, and the terminal block has the stud passed through the bolt through hole and is connected to the threaded rod. A bushing conductor centering device for a tank-type gas-insulated switchgear, characterized in that the bushing conductor attached to the terminal block is moved up and down along the bushing center axis by rotation. (2) The bushing conductor centering device for a tank-type insulated switchgear according to claim 1, wherein the stud is provided with a mark indicating the position of the contact attached to the bushing conductor.