JPS61177110A - Gas insulated switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates primarily to a gas insulated grounding switch that is incorporated into a gas insulated switchgear.

[Conventional technology]

Fig. 2 shows a cross-sectional view of an example of a conventionally used gas-insulated grounding switch. A movable contactor 4 is provided opposite to. The movable contact 4 is driven by an operating shaft 5 introduced into the container from an external operating device (not shown) through an airtight bearing on the side wall of the container 2 via a lever 6, and is engaged with the fixed contact 3. , a departure takes place.

Here, the movable contact 4 is insulated from the lever 6 by an insulator 7, and the sliding contact 8 is always connected to an insulating bushing 11 attached to the lid plate 10 of the container through a connecting wire 9.
It is led out of the container through the bushing conductor 12 and connected to ground. The sliding contact 8 is provided with a shield 13 and is mounted and supported on the cover plate 10 via an insulator 14.

[Problem that the invention seeks to solve]

In this way, the insulators 17, 14, the insulating bushing 11, etc. are used as insulating supports on the movable contact side, and the insulation resistance due to these is applied in parallel between the bushing conductor 12 and the ground.

When measuring the insulation resistance of a circuit in a gas-insulated switchgear incorporating this type of earthing switch, the bushing conductor 12 of the earthing switch is disconnected from the ground side and the insulation resistance between this and the earth is measured. . However, if the earthing switch has a conventional structure, the insulation resistances of the insulating support materials of each part are added in parallel, which inevitably causes errors in the measured values and reduces measurement accuracy.

[Means for solving problems]

In order to deal with the above-mentioned drawbacks, the present invention improves the internal structure of the earthing switch, so that the sliding contact, which was conventionally supported by an insulator, is supported by the bushing conductor of the insulating bushing, and thereby the insulating support material This aims to reduce the number of parts and also to save labor by reducing the number of parts.

〔Example〕

FIG. 3 shows a cross-sectional view of a single-pole earthing switch according to an embodiment of the present invention, in which, in the same way as in FIG. The movable contact 4 is driven from the operating shaft 5 via the lever 6 and engaged with the fixed contact 3.

However, the sliding contact 8 is supported by a bushing conductor 12 of an insulating bushing attached to the cover plate 10. In this case, since the bushing conductor 12 is attached to and supports a sliding contact at its tip, it is made longer and larger than before, and the insulating bushing 11 as a whole is made sufficiently strong mechanically.

Next, FIG. 1 (&) shows a sectional view of an embodiment of a two-pole gas insulated grounding switch, in which a fixed contact 3A is shown.

Movable contacts 4A and 4B provided opposite to 3B are fixed to a common drive plate 15 made of an insulator. Note 16
is a guide for the drive plate 15. In addition, the sliding contact 8
A and 8B are fixed to a common support plate 17 made of an insulator, and an insulating bushing IIA attached to the cover plate 10.
, IIB are fixed to bushing conductors 12A, 12B via connection conductors 18A, 18B, respectively. The sliding contacts 8A, 8B are thus mechanically integrated and strong and are held by and connected to the bushing conductors 12A, 12B, respectively.

On the other hand, as shown in FIG. 1(b), there is a receiver 19a on the container wall.
, a bearing 19 with a sealed structure including a sealing material 19b and a lid 19c is provided, through which the operating shaft 5 introduced airtight from the outside is connected to the drive plate 15 via the lever 6 and the link 20, and the movable contact 4A , 4B are simultaneously driven to form a fixed contact 3A.

Join or separate from 3B.

In addition, when using the above configuration, the fixed contacts 3A, 3
B and three sets of movable contacts 4A and 4B are provided in parallel.
It can also be used as a grounding switch for two phase circuits to perform three-phase operation at once. In the case of a multipolar type like this, the support plate 17
has the advantage that it is firmly held by a large number of bushing conductors.

〔Effect of the invention〕

As explained above, whereas in the past, an insulator was provided to support the sliding contact, in the present invention, the sliding contact is supported by a bushing conductor for drawing out the potential. When measuring insulation resistance, it eliminates the risk of the insulation resistance of the supporting insulator being added to the measured value in parallel, reduces the number of parts, reduces the amount of manufacturing and assembly work, and contributes to the miniaturization of the entire device. be able to.

Although the present invention was made with the intention of improving a gas insulated switch for grounding, it can be used not only for grounding but also as a general gas insulated switch.

[Brief explanation of the drawing]

FIG. 1 CL) (b) and FIG. 3 are sectional views showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional example. 1... Insulating gas, 2... Container, 3.3A, 3B.
・・Fixed contact, 4.4A, 4B・・Movable contact,
8, 8A, 8B...Sliding contact, 11. IIA, II
B...Insulating bushing. Spear I figure (of) Sai 2nd Sai 3 figure

Claims (1)

[Claims] A movable contact is housed opposite to a fixed contact in a sealed container filled with an insulating gas and connected to a bushing conductor of an insulating bushing attached to the container via a sliding contact, and the sliding contact A gas insulated switch characterized in that the child is held by the bushing conductor.