JPS60167224A - 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 Application of the Invention] The present invention relates to a gas circuit breaker, and more particularly to a circuit breaker structure with low operating force and excellent ability to interrupt large currents.

[Background of the invention]

Buffer-type gas circuit breakers (hereinafter referred to as GCBs) are the mainstream of power circuit breakers due to their simple structure and excellent performance.

However, since Buffer 2 GCB obtains the blowing pressure (buffer pressure) from the mechanical compression force caused by the shutoff operation,
As the breaking capacity increases, it becomes necessary to increase the operating force. To deal with this, the buffer 2〇〇B's operating device uses an air operating device or a hydraulic operating device that can generate high output.
As the operating force increases, not only the operating device itself but also the auxiliary devices become larger and more expensive. In addition, the movable part of the shutoff part must also be made larger in order to withstand enormous dynamic stress, which is part of the increase in operating force. And it wasn't a good thing. Therefore, various methods of increasing the breaking capacity without increasing the operating force have been proposed, but only a few have been put into practical use.

On the other hand, a self-cutting cutter that utilizes the arc heat of the cut-off current generated during the cut-off operation to apply pressure has been proposed since the early stages of GCB development. For example, Tokuko Sho 34-4585
:Circuit breaker, Utility Model Publication No. 34-7134:Circuit breaker, etc. is disclosed in the official gazette. This method has the great advantage that mechanical spraying does not require pressure generation, and because the movable part structure is simple and lightweight, it requires much less operating force than Buffer 2〇〇H. However, this method has only one opening in the storage chamber that stores the gas on the expansion side due to arc heat, and the gas blowing when the opening is opened is effective because the direction of the flow is the same as the opening direction of the movable contact. It cannot be sprayed and has poor large current interrupting ability. For this reason, the switches that have been put into practical use are of the order of several thousand amps.

Various countermeasures have been proposed in the past, such as a structure in which the opening is held open when the opening is opened, and a structure in which the direction of gas blowing is perpendicular to the opening direction of the movable contact. However, there is a drawback in that an interrupting part that satisfies both the requirements of air flow and effective spraying for arc extinguishing has not been obtained.

As described above, although the self-blade arc-extinguishing type interrupting unit has the excellent feature of low operating force, it has the disadvantage of being weak in large current interrupting ability, which has prevented it from being adopted.

[Purpose of the invention]

An object of the present invention is to propose a circuit breaker structure capable of interrupting large currents with low operating force.

[Summary of the invention]

The key points of the present invention include a pair of contacts that can be moved into and out of contact, a storage chamber provided to surround a part of the contact, and a plurality of insulating discharge guides having approximately the same shape at the opening of the storage chamber. In preparation, the gas pressure in the storage chamber increases due to arc generation, and in response to the breaking movement of at least one movable contact, the plurality of discharge guides open almost synchronously, and the high pressure gas in the storage chamber is discharged from the discharge guide. The purpose is to rapidly discharge the gas into an arc through the process.

[Embodiments of the invention]

An embodiment of the present invention will be specifically described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention following the shutoff operation process. FIG. 1 shows the closed state, and FIGS. 2 and 3 show the shut-off operation.

In the inserted state, the terminal plate 1 is fixedly held on a fixed part (not shown) and the first contact 2 is fixed to the terminal plate 1.
and an insulating locking portion 3. Drive mechanism (not shown)
a shaft-shaped second contact that is driven by the
There is a contactor 4, and the other end of this second contactor is slidably passed through a through hole 5a of a terminal plate 5, and is energized via a current collector 5b fixed to the terminal plate 5. There is a storage chamber outer cylinder 6a and a storage chamber cylinder 6b surrounding a part of the second contactor 4,
At the other ends of the storage chamber outer cylinder 6a and the storage chamber cylinder 6b, there is a tapered portion 7a that expands outward.

An insulating nozzle 7.8 with 8a is provided. When the contacts 2 and 3 are in the closed state, the storage chamber 6 is formed by the storage chamber outer cylinder 6a, the storage chamber cylinder 6b, the storage chamber end plate 6d, and the solid contacts 2 and 4.

The storage chamber 6a is held by a guide plate 9 fixed to the terminal plate 5 and is slidable. The storage chamber terminal plate 6d has a spring 10
is being pressed by. As the second contactor 4 opens and separates, the locking part 4a fixed to this contactor hits the storage chamber locking part 6C, and the entire storage chamber 6 slides to the right. Further, when the contactor 4 closes with the first contactor 2, the storage chamber 6 is pressed by the spring 10, slides to the left, and is stopped by the locking part 3.

The storage chamber 6 is formed with discharge guide portions 7b and 8b that communicate with the outside of the storage chamber via tapered portions 7a and 8a of nozzles 7.8 in the storage chamber outer cylinder 6a and the storage chamber inner cylinder 6b.

The circuit breaker is housed in a container (not shown) whose entire circuit breaker is filled with gas (eg, sulfur hexafluoride).

In the switch configured in this way, as shown in FIG. 1, the first switch is in the closed state. Second contact 2, 4
When the second contactor 4 is slid to the right in the drawing by a drive mechanism (not shown), the second
As shown in the figure, an arc 11 is generated between the contact 2 and the end surface of the cylindrical second contact 4, and the arc heat heats the cooling gas in the storage chamber 6, causing it to expand and increase its pressure. moreover,
When the second contact 4 slides, the locking part 4a fixed to the contact reaches the storage i locking part 6C, and as shown in FIG. 3, the entire storage chamber 6 is slid to the right in the drawing. move. In this state,
The nozzles 7.8 open almost synchronously, and the gas expanded and pressurized in the storage chamber is guided to the discharge guide portions 7b, 8b and blown onto the arc, thereby extinguishing the arc.

According to this embodiment, the pressure in the storage chamber 6 can be increased not only by arc heat but also by vaporization of the insulating nozzle, which further increases the effect. Additionally, the nearly symmetrical arrangement of the two nozzles makes the spraying even more effective. The drive section is the second contact 4
There are no heavy objects such as buffer cylinders with mechanical compression devices.

Therefore, there is an effect of reducing the operating force. Even if there is no insulating locking portion 3, a structure in which the equal contactor 2 contacts the nozzle 7 can still produce the effect of synchronous spraying.

A modification of the present invention will be explained with reference to FIGS. 4 and 5.

In order to more effectively blow gas during arc extinguishing, it is possible to reduce the gap g8 of the nozzle 7.8 in FIG. 4.

This embodiment is characterized in that only the storage chamber outer cylinder is driven in the latter half of the shutoff operation stroke □. The storage chamber cylinder 12b is fixed to the terminal plate 5, and the guide plate L is fixed to the storage chamber cylinder 12b.
2c allows the storage chamber outer cylinder 12a to slide. Fifth
The figure shows the state when the shutdown is completed. The gap between nozzle 7.8 is g
As shown in 2, it is possible to reduce the size and spray gas with a high flow rate. When the arc heat in the first half of the interruption process is used to increase the pressure in the storage chamber, the nozzle spacing is increased, and when the aim is to blow gas onto the arc to efficiently interrupt the current, the nozzle spacing is increased. Since the spacing can be set to an optimum size, there is an effect in terms of large current interrupting ability.

Another modification is shown in FIG. A suction chamber 14 is added in order to obtain stable performance in interrupting a wide range of currents ranging from small current force 1 to large current. The suction chamber 14 is a storage chamber cylinder 6
b, second contactor 41; formed by fixed piston 4b and contactor 4)N.

When the piston 4b reaches the locking portion 6C and slides toward the right side of the storage chamber 6, the suction chamber 14 has openings 13a and 13b.

9a, and the arc generated by the surface contactor 2.1m is rapidly sprayed with gas to extinguish it. Figure 7 also shows the suction chamber 14.
This is another modification with the addition of .

〔Effect of the invention〕

According to the present invention, the gas in the storage chamber can be easily expanded and pressurized using the thermal energy of the arc, and the force of 1 can be blown almost synchronously from multiple openings, so the operation force is low. Can cut off large currents.

[Brief explanation of the drawing]

1 to 3 are cross-sectional views of one embodiment of the present invention, and FIG.
5 and 5 are cross-sectional views of other embodiments of the present invention, and FIGS. 6 and 7 are cross-sectional views of the present invention in which a suction chamber is added. FIG. 7 is a cross-sectional view of another embodiment. 6... Storage chamber, 6a... Storage chamber outer cylinder, 6b... Storage chamber cylinder, 7, 8... Nozzle, 2, 4... Contactor,
11...A Koma 1 Illustration Collection 2 Sen ¥-y38:J Figure 4 Ki 5 Snapshot 6 Figure/4- Hayabusa Figure 7

Claims (1)

[Claims] 1. At least a pair of contacts provided in a container filled with arc-extinguishing gas, at least one nozzle for spraying an arc generated between the contacts, and A gas circuit breaker comprising a substantially sealed reservoir opening a nozzle vent, wherein one or more of the nozzles displaces the contact in relation to the movement of one or both of the contacts of the pair. A gas circuit breaker characterized by a shorter distance displacement. 2. Claim 1, characterized in that the vent ports of the two nozzles are configured to open and close almost synchronously.
Gas circuit breaker as described in section. 3. The gas circuit breaker according to claim 1, wherein the two nozzles have substantially the same shape. 4. Claim 4, characterized in that the volume of the storage chamber and the mutual gap-distance between the two nozzles change as one or both of the contacts in the pair move. The gas circuit breaker according to item 1, 2 or 3. 5. Claims 1, 2, 3, or 4, characterized in that a cylinder-piston type negative pressure generating device is provided in conjunction with the opening/disengaging operation of at least one of the contacts.
Gas circuit breaker as described in section.