JPH0355729A - Buffer gas-blast-circuit-breaker for cold district - Google Patents

Abstract

PURPOSE:To prevent reduction in circuit-breaking ability even in the use in a cold district by providing a buffer mechanism that has a gas guiding means and a liquid guiding means by which a liquefied insulating gas is guided. CONSTITUTION:When the surrounding environment is reduced to an ultra low temperature, in a buffer cylinder 7, a part of the insulating gas 30 is liquefied, and liquefied insulating gas 20 is accumulated in an inner lower part of the cylinder 7. When a gas-blast-circuit-breaker is cut off in this condition, due to the movement of the cylinder 7, the gas therein is compressed. The insulating gas 20 accumulated in the lower part of the cylinder 7, sandwiched between a projection 6a and a fitted part 11, passes through a liquid flow hole 7c, and is blasted to an arc 40 generated between a moving arc contact 4 and a fixed arc contact 3. The insulating gas 39 in gas form passes through a gas flow hole 7a, and is blasted to the arc 40. The emission from the liquid flow hole 7c of the insulating gas 20 is splashed near the point the arc is generated, since the insulating gas 30 is emitted from the flow hole 7a at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a buffer type gas circuit breaker for cold regions, which is an improved version of the puff 7 type gas circuit breaker.

[Prior Art] A conventional buffer type gas circuit breaker blows an insulating gas onto an arc generated when the circuit is cut off to extinguish the arc and cut off the electrical circuit. Therefore, conventional buffer type gas circuit breakers are equipped with a buffer mechanism that sprays insulating gas onto the generated arc. This conventional panofa mechanism has a buffer cylinder that moves during the shutoff operation,
The buffer piston is disposed inside the buffer cylinder and is fixed to the container of the buffer type gas circuit breaker, and has a nozzle that guides insulating gas to the location where the arc occurs. This nozzle communicates with a gas passage hole provided near the center of the end of the buffer cylinder facing the buffer piston. Therefore, the insulating gas inside the buffer cylinder is compressed as the buffer cylinder moves, and is guided to the arc generation location through the gas passage hole and the nozzle.

[Problems to be Solved by the Invention] With the structure described above, the conventional buffer type gas circuit breaker extinguishes the arc by blowing the insulating gas inside the Pasofa cylinder onto the arc that is generated when the circuit is shut off. However, when using a conventional buffer type gas circuit breaker in a cold region where the ambient temperature is extremely low (e.g. -30°C or higher), some of the insulating gas inside the panofa cylinder liquefies. There were cases where the arc extinguishing ability was insufficient. Therefore, when a conventional Pasofa type gas circuit breaker is used in a cold region, it is necessary to take into account the decrease in breaking performance and use a device with a certain degree of breaking capacity.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a buffer type gas circuit breaker for cold regions that does not cause a decrease in interrupting performance even when used in cold regions.

[Means for Solving the Problems] A buffer type gas circuit breaker for cold regions according to the present invention has a main fixed contact and a main movable contact that can be moved in and out of a container filled with an insulating gas. An arc contact means having a contact means, and a fixed arc contact and a movable arc contact that are electrically connected to the main fixed contact and the main movable contact, respectively, and move toward and away from each other in conjunction with the main contact means. and a buffer mechanism having gas guiding means for guiding insulating gas to the arc generating location of the arc contacting means and liquid guiding means for guiding liquefied insulating gas.

[Function] In the buffer type gas circuit breaker for cold regions according to the present invention, when the ambient temperature becomes extremely low, liquefied insulating gas accumulates at the lower part of the inner surface of the panofa cylinder. However, at the time of shutoff, this liquefied insulating gas is blown onto the arc by the liquid guiding means of the buffer mechanism that is linked to the shutoff operation, and is gasified. At the same time, an insulating gas as a gas is also blown onto the arc by the gas guide means.

[Example] Hereinafter, an example of the buffer type gas circuit breaker for cold regions of the present invention will be described with reference to the drawings. Figures 1 and 2 are side sectional views showing essential parts of an embodiment of the Pasofa-type gas circuit breaker for cold regions of the present invention, with Figure 1 showing the state after it has been turned on, and Figure 2 showing the shut-off state. Indicates the state at the time. FIG. 3 is a front view of the buffer piston 6 shown in FIG. 1.

FIG. 1 shows a shutoff section horizontally disposed inside a buffer-type gas circuit breaker for cold regions filled with insulating gas 30. As shown in FIG. Further, FIG. 1 shows a retracted state in which the fixed main contact 1 contacts the main contact 2, and the fixed arc contact 3 contacts the movable arc contact 4. Insulated nozzle 5
guides the fixed arc contact 3 and brings it into contact with the movable arc contact 4. In FIG. 1, the end of a cylindrical buffer cylinder 7 is fixed to the right side of the movable main contact 2, and the movable finger contact 9 connected to the electric circuit is always in contact with the outer periphery of this buffer cylinder 7. are doing. Therefore, the buffer cylinder 7 and the movable contact 2 are always connected to the electric circuit.

Furthermore, an arc extinguishing part 8a is attached to the inner side of the fixed part between the driving main contactor 2 and the buffer cylinder 7. The hollow motive arc contactor 4 is held approximately at the center of the movable main contactor 2 by this arc extinguishing portion 8a.

The arc extinguishing part 8a is integrated with a hollow drive shaft body 8b that drives the movable side of the interrupting part, and the hollow part of the movable arc contactor 4 and the hollow part of the drive shaft body 8b are in communication.

Further, on the right side in FIG. 1, there is disposed a passa piston 6 which is passed through the drive shaft body 8b and fixed to the container of the apparatus. The drive shaft body 8b slides on the inside of this buffer piston 6, and performs a contact/separation operation to move the movable side of the cutoff portion from side to side. Further, the buffer cylinder 7 has its inner wall contacted with the outer edge of the buffer piston 6 and moves 4z.

In this embodiment configured as described above, the arc extinguishing part 8a is provided with a plurality of gas passage holes 7a that connect the inside of the puffer cylinder 7 and the arc generation side.

Further, in FIG. 1, a fitting wall 7b is provided horizontally projecting below the right side surface of the arc extinguishing portion 8a.

Further, a liquid flow path hole 7c is provided at the lower end of the right side surface of the arc extinguishing portion 8a. This liquid flow path hole 7c penetrates to the arc generation side. On the other hand, a protruding portion 6a is provided at the lower end of the buffer piston 6 in a direction that extends toward the arc extinguishing portion 8a. The shape of the protrusion 6a is a recess 1l formed by the fitting wall 7b, the arc-extinguishing part 8a, and the lower part of the buffer/cylinder 7.
The movable side of the blocking part is made to fit into the recess 1l when in the blocking state. Furthermore, a guide rod 10 is fixed to the upper inner wall of the path sofa cylinder 7 in parallel to the direction in which the blocking portion approaches and separates. By engaging this guide rod IO with the guide groove 6b on the upper part of the buffer piston 6, the movable side of the blocking part is regulated so as not to rotate and move, and is smoothly moved in the approaching and separating directions.

Next, the operation of the embodiment of the buffer-type gas cutoff chamber for cold regions of the present invention shown above will be explained.

When the ambient environment temperature becomes extremely low (e.g. -30°C or higher), a part of the insulating gas 30 (e.g. sulfur hexafluoride gas) becomes liquid inside the buffer cylinder 7, and the liquefied insulating gas 20 flows into the buffer cylinder. It collects in the lower part of the inner side of 7 (Fig. 1). At this time, when the buffer-type gas cut-off zone for cold regions of this embodiment is cut off, the gas inside the buffer cylinder is compressed by the movement of the buffer cylinder 7. At this time, the liquefied insulating gas 20 accumulated in the lower part of the panofa cylinder 7 is
As shown in the figure, it is sandwiched between the protrusion 6a and the fitting part 1l.
The liquid passes through the liquid flow path hole 7c and is blown onto the arc 40 generated between the movable arc contactor 4 and the fixed arc contactor 3. Further, the insulating gas 30, which is a gaseous body, passes through the gas passage hole 7a and is blown onto the arc 40 at the same time. At this time, the liquefied insulating gas 20 ejected from the liquid flow path hole 7C is scattered near the arc generation location because the insulating gas 30 is simultaneously ejected from the gas flow path hole 7a. In this embodiment, the gas guiding means is the gas passage hole 7a, and the liquid guiding means is the liquid passage hole 1c. ! : The fitting wall 7b and the protrusion 6a.

The vanofa mechanism includes a vanofa cylinder 7, a paso piston 6, an arc extinguisher 8a, and a drive shaft body 8b.

[Effects of the Invention] As described above, according to the present invention, by providing a buffer mechanism that connects the gas guiding means and the liquid guiding means for guiding the liquefied insulating gas, liquefaction of the insulating gas due to extremely low temperatures can occur. However, since it is possible to spray liquefied insulating gas together with the insulating gas onto the arc that is generated during shutoff, it is possible to obtain a Pasofa-type gas circuit breaker for cold regions that does not cause a decrease in shutoff performance even when used in cold regions. can.

[Brief explanation of drawings]

FIGS. 1 and 2 are side sectional views showing essential parts of an embodiment of the panofur-shaped gas barrier for cold regions of the present invention, and FIGS.
The figure is a front view of the Panov 7 piston of FIG. 1. In the figure, l is a fixed main contact, 2 is a movable main contact, and 3 is a fixed main contact.
is a fixed arc contact, 4 is a movable arc contact, 6 is a Hannover piston, 7 is a buffer cylinder, 8a is itjf
The arc portion 8b is a drive shaft body. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A main contact means having a main fixed contact and a main movable contact that can be connected to and separated from each other in a container filled with an insulating gas, the main fixed contact and the main movable contact being electrically connected to each other. Arc contact means having a fixed arc contact and a movable arc contact that are connected to each other and move toward and away from each other in conjunction with the main contact means; gas guide means for guiding insulating gas to an arc generation location of the arc contact means; and liquefied insulating gas. A buffer type gas circuit breaker for cold regions, comprising: a buffer mechanism having a liquid guide means for guiding the liquid.