JPS63291331A - Buffer type gas interrupter - Google Patents

Abstract

PURPOSE:To upgrade interpole insulating performance and to realize miniaturization and reduction of an interrupter by quickly exhausting a high-temperature gas through a rectification guide member located in the vicinity of a fixed part of a fixed contact maker after extinction is finished. CONSTITUTION:A gas which contributes to extinction so as to become high- temperature is increased in its pressure by an action of an unillustrated piston and it is exhausted along a fixed contact maker 7 in the direction of a member 22. The member 22 is fixed on a position where the fixed contact maker 7 is supported on an interrupter body, and it is formed in a taper-flat shape toward a side end part of the fixed contact maker 7. A plurality of the members of the same shapes are disposed symmetrically to a vertical axis of the fixed contact maker 7, and respective gaps formed therebetween are made to function as gas channels. Accordingly the members 22 serve as rectification guides for the gas channels and hence a gas channel cross-sectional area is equivalently increased. Even if the interrupter is miniaturized, interpole insulating performance can be prevented from being deteriorated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a puffer type gas circuit breaker, and particularly to a circuit breaker structure suitable for improving insulation performance.

[Conventional technology]

In recent years, circuit breakers used in large power systems have become smaller and smaller as well as higher voltage and larger current. As the interrupter container becomes smaller and smaller, the method of processing the high temperature gas heated by the arc when interrupting the short circuit current becomes an issue, and this determines the insulation performance between the electrodes of the interrupter. A conventional example will be explained below with reference to the drawings.

FIG. 9 shows an example of a puffer type gas circuit breaker disclosed in Japanese Patent Publication No. 57-18292.

The fixed side is composed of a shield 3 supported and fixed to the container 2 by an insulating tube 1, connection conductors 4 and 5, a fixed plate 6, a fixed arc contact 7, a fixed main contact 8, and a shield 9.

The movable side includes an insulator nozzle 11 fixed to or integrated with the puffer cylinder 10, a movable main contact 12, a movable arc contact 13, a rod 14, and a fixed piston 15.
It consists of

Here, 16 is a gas bushing or a center conductor of a gas insulated bus bar.

The shutoff operation is performed by driving the rod 14 to the right in the figure by an operating device (not shown), thereby shutting down the puffer cylinder 10, fixed piston 15. The gas in the puffer chamber 17 formed by the rod 14 is compressed, and between the main contacts 8 and 12,
Next, the arc contacts 7 and 13 are separated. The arc 18 generated between the arc contacts 7 and 13 due to the disconnection is extinguished by the blowing of gas guided from the buffer chamber 17 by the insulator nozzle 11. The high-temperature gas that contributes to this arc extinguishing is transmitted from the outer circumferential space of the fixed arc contactor 7 to the space 20 inside the container 2 through the hole 20 provided in the fixed plate 6, as shown by the gas flow 19 in the figure. leading to.

10 and 11 show conventional examples of the fixing plate 6 in FIG. 9. The shape of the fixed plate 6 is as shown in the figure.
Various shapes can be considered by cutting out unnecessary portions as holes 2o in terms of fixation of the shield 9 and mechanical strength.

As in the conventional example, by providing holes 20 in the fixed plate 6 and quickly discharging high-temperature gas into the space 21, the interelectrode insulation performance can be improved. Further, the high temperature gas is transferred to the hole 20. Since the liquid is cooled while being discharged through the shield 9 and the shielding shield 3, the earth insulation performance between the shield 9 and the container 2 can be prevented from deteriorating.

[Problem that the invention seeks to solve]

However, when circuit breakers were made smaller and smaller, the following problems occurred.

When downsizing is achieved by reducing the diameter of the interrupter container, it is necessary to reduce the diameter of the shield 9 from the viewpoint of ground insulation performance, but this has the disadvantage that the exhaust area of the hole 20 provided in the fixed plate 6 becomes smaller. there were. For example, the hole 20 in FIGS. 10 and 11
Although there is a method of increasing the exhaust area by reducing the dimensions between the electrodes, mechanical strength is required for supporting and fixing the fixed main contact 8, shield 9, etc., so that insulation performance between the electrodes can be obtained. There was a limit to securing the necessary exhaust pressure area. In this way, by reducing the area of the holes 20, the gas flow 1
9, there was a problem in that the interelectrode insulation performance deteriorated.

An object of the present invention is to provide a circuit breaker that is further miniaturized by improving the insulation performance between poles.

[Means for solving problems]

The above object is achieved by providing a conductor or member whose movable side end is tapered in the fixed arc contactor fixing part to guide a high temperature gas flow.

[Effect]

The conductor and member having a tapered shape can improve the flow efficiency of high temperature gas. This equivalently increases the gas exhaust area and prevents deterioration of interelectrode insulation performance.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 shows a longitudinal cross-sectional view of a puffer type gas circuit breaker.The difference from the conventional example shown in Fig. 9 is that a member 22 is provided on the fixed plate 6; Same as figure.

FIGS. 2 and 3 are external views of the member 22 in FIG. 1 viewed from direction A, and show an example of the case where the member 22 is applied to the conventional examples shown in FIGS. 10 and 11, respectively. By forming the member 22 in a tapered shape to guide high temperature gas to the holes 20, gas flow efficiency can be improved. Therefore, the area of the hole 20 is equivalently increased, and the high temperature gas can be quickly discharged into the space 21.

Therefore, even if the area of the hole 20 is reduced, the deterioration of the insulation performance between the electrodes can be prevented.6 FIG. 4 shows a different embodiment of the present invention. The members shown in Figure 3 are integrally formed. With this configuration, Figure 2,
The same effect as in FIG. 3 can be obtained.

FIG. 5 shows still another embodiment of the present invention, in which the connecting conductors 4, 5, . The fixing plate 6 is integrally formed with a connecting conductor 23 having a radial shape. 6 and 7 show the connection conductor 23 and the fixed arc contact 25 fixed thereto and provided with the tapered conductor portion 24 as seen from the direction A in FIG. Here, the screw hole 26,
A fixed arc contact 25, a main fixed contact 8, a shield 9, etc. are fixed at 27° and 28, respectively.

According to this embodiment, from the viewpoint of mechanical strength of the contact conductor 23, the plate thickness can be made smaller than that of the conventional example shown in FIGS. 10 and 11, so that the exhaust area can be further increased. becomes. Therefore, compared to the embodiment shown in FIG.
This has the effect of improving interelectrode insulation performance. Furthermore, by making the connecting conductors 23 radial, the contact area between the high temperature gas and the connecting conductors 23 increases, which has the effect of increasing the cooling effect of the high temperature gas.

FIG. 8 shows an example in which the embodiment shown in FIG. 5 is applied to an insulator-type circuit breaker in which the circuit breaker container is constituted by an insulator 29.

Here, 30 is an external terminal.

In the insulator-type circuit breaker, since the gas volume in the container interior space is relatively small, there is a possibility that gas exhaust from the fixed arc contact 24 portion may be suppressed due to a pressure increase due to the high temperature gas in the non-flow side space 31. On the other hand, as described in the embodiment of FIG. 5, by increasing the cooling effect and reducing the pressure rise in the space 31.

Gas exhaust can be improved.

〔Effect of the invention〕

According to the present invention, the insulation performance between electrodes can be improved, so that the circuit breaker can be further downsized and downsized.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view of a puffer type gas circuit breaker according to an embodiment of the present invention, FIGS. 2 to 4 are partial perspective views of FIG. 1, and FIG. FIG. 6 is a partial vertical sectional view of the puffer type gas circuit breaker. FIG. 7 is a partial perspective view of FIG. 5, and FIG. 8 is a partial longitudinal sectional view of a puffer type gas circuit breaker according to still another embodiment of the present invention.
Figure 9 is a sectional view of a conventional gas circuit breaker, Figures 10 and 11.
The figure is a front view of the fixing plate of FIG. 9. Item I Item 4 Item S Item 8 Country

Claims (1)

[Scope of Claims] 1. In a puffer-type gas circuit breaker equipped with a separable fixed arc contact and a movable arc contact in a container, the movable arc contact is disposed near a fixed portion of the fixed arc contact. A puffer type gas circuit breaker characterized by having a conductor with a tapered side end.