JPH0210618A - Gas breaker - 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 to a gas circuit breaker that extinguishes an arc between contacts by spraying an arc extinguishing gas onto the arc, and particularly relates to a gas circuit breaker that extinguishes an arc between contacts.

The present invention relates to a blocking structure suitable for reducing operating force.

[Conventional technology]

Conventionally, in this type of gas circuit breaker, for example, a puffer-type gas circuit breaker, a puffer device installed in an arc-extinguishing gas space in a sealed container is operated in conjunction with the disconnection operation, and the arc-extinguishing gas under high pressure is activated. This method blows gas onto the arc generated between the contacts to extinguish it, but with this method, the pressure rise inside the puffer device increases as the breaking current increases, and the resulting puffer reaction force is resisted. It had the disadvantage that a strong operating force was required to drive it.

As a method to eliminate this increase in operating force, the pressure in the arc extinguishing chamber is increased by using the heat generated by the arc between the contacts.
There is a self-blade arc-extinguishing type gas arc breaker that extinguishes the arc by spraying it onto the arc. This is because there is no reaction force against the operating force.
It has the advantage of being easy to reduce operating force. However, when a small current is interrupted, the pressure in the arc extinguishing chamber cannot be sufficiently increased, resulting in a decrease in interrupting performance.

Based on the above, in order to incorporate the advantages of puffer type gas circuit breakers and self-blade arc-extinguishing gas circuit breakers and compensate for their shortcomings, a proposal was made in JP-A-53-11 for a circuit breaker structure that combines these gas circuit breakers.
7751, Special Publication No. 18290, Special Publication No. 18290, Special Publication No. 18290, Special Publication No. 1982-
This is proposed in Japanese Patent No. 32765. below.

A conventional example will be explained using FIGS. 6 and 7.

FIG. 6 shows a switching device disclosed in Japanese Patent Application Laid-open No. 117751/1983. By driving the operating member 1 downward in the figure, the gas in the puffer chamber 2 is compressed, and the fixed contact 3
．． An arc occurs between the movable contacts 4.

Due to the heat of this arc, the gas in the arc extinguishing chamber 6 in the container 5 becomes high pressure. When a large current is interrupted, the arc is extinguished by spraying high pressure gas in the arc extinguishing chamber 6, and when a small current is interrupted, the arc is extinguished by spraying high pressure gas in the puffer chamber 2. With this configuration, stable performance can be obtained from a large current region to a small current region.

However, in terms of reducing the operating force when interrupting a large current, the pressure in the puffer chamber 2 increases to the same level as the pressure in the arc extinguishing chamber 6 because the high pressure gas in the arc extinguishing chamber 6 flows back into the puffer chamber 2. Since the force acts as a reaction force, no significant effect can be expected.

FIG. 7 shows a gas circuit breaker disclosed in Japanese Patent Publication No. 61-18290, and the difference from FIG. 6 is that the puffer chamber 2 is compressed from the middle of operation. In this embodiment, unlike the embodiment shown in FIG. 6, there is no reaction force caused by the rise in pressure in the puffer chamber in the first half of the operation, and therefore it is effective in reducing the operating force. However, in the latter half of the operation, there is a drawback similar to that shown in FIG. Furthermore, this method has the disadvantage that the arcing time becomes long because gas cannot be sprayed in the first half of the operation when a small current is interrupted.

[Problem to be solved by the invention]

The circuit breaker that combines a puffer-type gas circuit breaker and a self-blade arc-extinguishing gas circuit breaker has the same nine parts compared to a conventional puffer-type gas circuit breaker, which has a simpler structure, but has a simpler structure. Therefore, an inexpensive structure of the cut-off part was desired.

The purpose of the present invention is to provide a simple and inexpensive interrupting means for a circuit breaker that combines a puffer type gas circuit breaker and a self-blade arc-extinguishing gas circuit breaker, and to provide stable performance from high current range to small current range. It is an object of the present invention to provide a cutoff section that can be obtained and that requires less operating force.

[Means to solve the problem]

The above purpose is to provide a puffer chamber inside the movable contact, use the movable contact as a part of the puffer device, and suppress the flow of high-temperature gas heated by arc heat into the puffer chamber when a large current is interrupted. This is achieved by

[Effect]

By using the movable contact as part of the puffer device, it is possible to reduce the number of parts. Further, for blowing gas from the puffer chamber to the arc, by providing holes in areas other than the arc generating portion, high-temperature gas flowing into the puffer chamber can be suppressed.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows a gas circuit breaker according to an embodiment of the present invention in a closed state. The container 1 consists of an insulating cylinder 2° and a metal container 3. It is formed from terminal plates 4 and 5.

The end plate 4 has an arc extinguishing container 6. Fixed contact 7. An insulator nozzle 8 is fixed to form an arc extinguishing chamber 9.

On the other hand, the end plate 5 is provided with a fixed piston 1o, and a movable contactor 11 which also serves as a puffer cylinder is slidably installed to form a puffer chamber 12.

This movable contactor 11 is connected to a lever 14 by a pin 13. Here, 15 is an oval hole that guides the pin 13, 16 is the rotation axis of the lever 14, and 17a is
There is a hole for gas blowing.

Next, the shutoff operation will be explained. When the lever 14 is operated in the clockwise direction about the rotating shaft 16 by an operating device outside the container 1 (not shown), the movable contactor 11
is driven to the right in the figure.

As a result, the gas in the puffer chamber 12 is compressed, and an arc is generated between the contacts 7 and 11. When a large current is interrupted, high-pressure gas raised by the arc heat in the arc extinguishing chamber 9 is sprayed,
Further, when a small current is interrupted, the arc is extinguished by blowing gas from the hole 17a.

In this way, by utilizing the interior of the movable contactor 11 as the puffer chamber 12, it is possible to configure a small and simple-structured shutoff section.

FIG. 2 shows a second embodiment of the invention. The difference from the embodiment shown in FIG. 1 is that a spray hole 17b is provided on the outer periphery of the tip of the movable contactor 11.

By reducing the area of the blow hole 17a provided in the arc generating part and by providing the blow hole 17b on the outer periphery, it is possible to suppress the flow of high temperature gas into the puffer chamber 12 when a large current is interrupted. Even when a small current is cut off, sufficient spraying can ensure a gas flow.

By providing the blow hole 17b in areas other than the arc generating part in this way, it is possible to suppress the pressure rise in the puffer chamber 12 when a large current is interrupted, and reduce the reaction force, thereby reducing the operating force. .

FIG. 3 shows a third embodiment, in which a plurality of slits 18 are provided at the tip of the movable contact 11, and the other structure is the same as the embodiment shown in FIG.

Slit 1 at the tip of the movable contact 11 which is the arc generating part
By reducing the width of 8 and increasing its depth, the second
This embodiment has the same effect as the embodiment shown in the figure.

FIG. 4 is a fourth embodiment of the present invention, and shows a state in the middle of a shutoff operation.

In this embodiment, the movable contact 11 has a small diameter portion 11a and a large diameter portion 1.
1b, and a spray hole 17c is provided in the large diameter portion 11b, and the other configurations are the same as the embodiment shown in FIG.

According to this embodiment, there is almost no inflow of high-temperature gas into the puffer chamber 12 when a large current is interrupted, making it possible to significantly reduce the operating force. When a small current is cut off, a sufficient gas flow rate can be obtained as shown by the gas flow 19 in the figure.

FIG. 5 shows a fifth embodiment of the present invention, which differs from the embodiment shown in FIG. 4 in that a spray hole 17a is provided at the tip of the movable contactor 11. With this configuration, small current interrupting performance can be improved. However, compared to the embodiment shown in FIG. 4, there is a drawback that high-temperature gas flows into the puffer chamber 12 when a large current is cut off, so that the pressure rise in the puffer chamber 12 becomes high and the reaction force increases.

〔Effect of the invention〕

According to the present invention, since the blocking portion can be constructed with a simple structure,
It is possible to provide a small, simple, and inexpensive gas circuit breaker.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a gas circuit breaker according to an embodiment of the present invention;
The figure is a partial sectional view of a gas circuit breaker according to a second embodiment of the present invention.
FIG. 3 is a perspective view of a movable contact according to a third embodiment of the present invention;
FIG. 4 is a sectional view of a gas circuit breaker according to a fourth embodiment of the present invention;
FIG. 5 is a partial sectional view of a gas circuit breaker according to a fifth embodiment of the present invention, and FIG. FIG. 7 is a longitudinal sectional view of a gas circuit breaker showing an example of the prior art.

Claims (1)

[Claims] 1. A fixed contact and a movable contact that can be separated, an arc extinguishing chamber provided on the fixed contact side, and an arc extinguishing gas in connection with the operation of the movable contact. A gas circuit breaker equipped with a compressing puffer device, characterized in that the puffer device is provided inside the movable contact. 2. The gas circuit breaker according to claim 1, wherein a plurality of holes or slits communicating from the puffer device to an external space are provided at the tip of the movable contact. 3. In claim 1, the movable contact is formed of a small diameter part and a large diameter part, and the large diameter part is provided with a hole communicating from the puffer device to an external space. Gas circuit breaker. 4. The gas circuit breaker according to claim 3, wherein a hole communicating from the puffer device to an external space is provided at the tip of the movable contact.