JPS6280930A - Buffer type 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] [Technical Field of the Invention] The present invention relates to a puffer-type gas breaker, and in particular, a puffer-type gas breaker that effectively utilizes arc-extinguishing gas that is blown onto an arc that is generated when shutting off. This is an improved mechanism.

[Technical background of the invention and its problems] High-pressure gas circuit breakers that spray arc-extinguishing gas such as SF6 gas onto the arc are widely used because they can withstand high voltage easily. The buff 1 type gas breaker, which compresses arc-extinguishing gas using the compressed gas and sprays the compressed gas onto the arc, has a simple structure and has become the mainstream of high-pressure circuit breakers.

A buff like this? In recent years, the breaking capacity of type gas circuit breakers has been increasing as the short circuit capacity has increased due to the increase in power transmission capacity.

On the other hand, in order to downsize devices, efforts are being made to increase the breaking capacity per point and reduce the number of series breaking points in the circuit breaker. Therefore, the breaking performance of the circuit breaker is
In addition to the electric field design between the @ of the breaker, optimization of the gas blowing mechanism is required.

In order to achieve this purpose, recently, the special public
One-way spray buff as shown in Publication No. 306? A type gas breaker has been proposed.

This has a configuration as shown in FIGS. 3(A> and 3(B)).

That is, at a position facing the cylindrical fixed arc contact 1,
A movable arc contactor 3 supported at the tip of the operating rod 4
is installed. This operating rod 4 has a movable buff 1
A cylinder 5 is mounted and fixed, and a compression chamber 7 is formed between the movable buff 1 cylinder 5 and a fixed puffer piston 6 fixed in a container (not shown). Also, a movable pack 7 forming this compression chamber 7
The upper half of the cylinder 5 is provided with an opening 5a for allowing the insulating gas to flow out to the upper side of the movable arc contactor 3, and the operating rod 4 is further provided with an opening 5a for allowing the insulating gas to flow out to the inside of the movable arc contactor 3. The opening 4a for
It is located adjacent to. Further, on the outside of the movable arc contact 3, a nozzle 8 for forming an insulating gas flow path is fixedly supported by a movable current-carrying contact 9.

In a unidirectional blowing device having such a configuration, when a cutoff command is given to a buff 1 type gas breaker, an operating mechanism (not shown) operates to move the operating rod 4 as shown in FIG.
A> to the right, and as shown in FIG. 3(B), the movable arc contact 3 connected to this operating rod 4 is separated from the fixed arc contact 1. As a result, an arc 10 is generated between the fixed arc contact 1 and the movable arc contact 3.

On the other hand, as a result of the operating rod 4 being driven to the right in FIG. The arc-extinguishing gas in the compression ¥7 that was not formed by step 6 is compressed. The insulating gas compressed in this way passes through an opening 4a provided in the operating rod 4 and an opening 5a provided in the movable puffer cylinder 5, - through the inside and outside of the movable arc contact 3, respectively. The arc 10 is blown onto the arc 10.
＠Arc.

In this way, the unidirectional blowing of insulating gas against the arc from the inside and outside of the movable arc contactor 3 is performed by the puffer type gas breaker, while the conventionally used bidirectional blowing is performed by the buff 1 type gas breaker. Compared to other conventional devices, the amount of gas required for shutoff operation is half or less, allowing for highly efficient shutoff operation.

However, according to the applicant's research, in the puffer type gas breaker, the cross-sectional area of the two openings 4a and 5a, which serve as the insulating gas flow path, has a large effect on the breaker performance. It was found that Therefore, in order to extinguish the arc more effectively, it is desired to optimize the cross-sectional area of the flow path for flowing the insulating gas to the inside and outside of the movable arc contactor 3.

[Object of the Invention] The present invention was proposed in order to solve the problems of the conventional puffer type gas breaker as described above. An object of the present invention is to provide a puffer-type gas breaker that is optimized and enables effective arc extinguishing.

[Summary of the Invention] The puffer type gas breaker of the present invention has a cross-sectional area of an opening for flowing insulating gas into the inside of a movable arc contactor.
The cross-sectional area is equal to or larger than the cross-sectional area of the opening through which the insulating gas flows out to the outside of the movable arc contact, so that effective breaking operation can be performed with a small amount of insulating gas.

[Embodiment of the Invention] An embodiment of the present invention will be specifically described below with reference to FIGS. 1 and 2. Incidentally, the same members as those of the conventional type shown in FIG. 3 are given the same reference numerals, and explanations thereof will be omitted.

*Structure* In this embodiment, in order to flow the insulating gas inside the movable arc contactor 3, the cross-sectional area A of the opening 4a formed in the operating rod 4 is changed to the insulating gas outside the movable arc contactor 3. In order to flow out, the cross-sectional area B of the opening 5a formed in the movable puffer cylinder 5 is made equal to or larger than that (A≧8).

*Function* In the puffer type gas breaker of this embodiment having such a configuration, when a shutoff command is given, the operating mechanism section (not shown) operates, and the operating rod 4 is driven to the right in Fig. 1. be done. As a result, compression ¥7 is compressed, and compression chamber 7
The insulating gas inside is blown onto the arc 10 through the two openings 4a, 5a.

In this case, the cross-sectional area A of the two openings 4a, 5a.

From the graph of FIG. 2, which examines the relationship between the ratio A/B of B and its rapid disconnection performance, excellent interrupting performance is obtained when the value of A/B is 1 or more.

Effects of the Invention 1 As described above, according to the present invention, the cross-sectional area of the two flow paths for the insulating gas that is blown from the compressor to the arc through the two flow paths is optimized, thereby achieving excellent results with a small amount of gas. It is possible to provide a puffer type gas breaker that can obtain arc extinguishing performance.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the buff 1 type gas breaker of the present invention, FIG. 2 is a diagram showing the relationship between the cross-sectional area of the insulating gas flow path and the breaking capacity, and FIG. Is it a conventional pant type 1 gas? It is a cross-sectional view showing the configuration of the disconnector, where (A> shows the closed state and (B) shows the breaking point in operation. 1... fixed arc contact, 2... fixed energized contact,
3... Movable arc contactor, 4... Operating rod, 4a
...Opening part, 5...Movable buff 1 cylinder, 5a.
...Opening, 6...Fixed buff 7 Piston, 7...
To compression, 8... Nozzle, 9... Movable current-carrying contact, 1
0...Arc.

Claims (1)

[Claims] Between a fixed arc contact and a movable arc contact that are arranged so as to be able to approach and separate from each other on a common central axis, an arc that is compressed in a compression chamber is generated when the arc contacts are opened. In a puffer-type gas breaker, in which openings for spraying arc-extinguishing gas are separately formed so as to communicate with the inside and outside of the movable arc contact, the opening that communicates with the inside of the movable arc contact A puffer-type gas breaker characterized in that the cross-sectional area is equal to or larger than the cross-sectional area of the opening leading to the outside.