JPH079778B2 - Gas breaker - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a gas circuit breaker, and in particular,
This is a modification of the spraying mechanism that effectively utilizes the arc-extinguishing gas that sprays onto the arc generated during interruption.

[Technical background of the invention] With the increase in short-circuit capacity due to the increase in transmission capacity in recent years,
The breaking capacity of breakers is also increasing. On the other hand, in order to reduce the size of the device, it is also attempted to increase the breaking capacity per point and reduce the number of series breaking points of the breaker. Therefore, as for the breaking performance of the breaker, it is required to optimize the gas blowing mechanism together with the electric field design between the poles of the breaker.

This point will be described with respect to the conventional puffer type gas circuit breaker shown in FIGS. 5 and 6. The operation of the puffer type gas circuit breaker is described in detail, for example, in "Power Circuit Breaker" edited by The Institute of Electrical Engineers of Japan. In addition,
The same reference numerals are given to the same portions in FIGS. 5 and 6.

FIG. 5 shows the arc extinguishing chamber of the puffer type gas circuit breaker in the closed state. In the figure, the cylindrical fixed electrode 1 and the movable electrode 2 formed in an annular shape are in contact with each other.
Is connected by a hollow operating rod 3 having an opening 3a to an operating mechanism (not shown) on the right side in FIG. Further, the puffer cylinder 4 has an opening portion.
4a is provided, and the gas in the compression chamber 6 can flow out through the cylindrical gas passage 8 formed by the outer insulating nozzle 7a and the inner insulating nozzle 7b fixed to the puffer cylinder 4. These parts are containers with insulating properties 9
The arc-extinguishing gas is filled in the internal space 10 of the insulating container 9 which is housed inside. In this example, the container has an insulating property, but there is also a puffer type gas circuit breaker in which the arc extinguishing chamber member is supported by the insulating material in the metal tank.

When a breaking command is given to this breaker, an operating mechanism (not shown) operates to drive the operating rod 3 to the right in FIG. 5, and is connected to the operating rod 3 as shown in FIG. The movable electrode 2 is separated from the fixed electrode 1. As a result, an arc 11 is generated between the fixed electrode 1 and the movable electrode 2. On the other hand, as a result of the operation rod 3 being driven to the right in FIG. 6, the puffer cylinder 4 attached to the operation rod 3 also moves to the right, compressing the arc-extinguishing gas in the compression chamber 6,
An arc 11 is blown with the compressed arc-extinguishing gas through the opening 4a of the puffer cylinder 4, the gas passage 8 and the gas ejection port 8a to extinguish the arc 11. This gas stream is split into two streams 12a and 12b, which are split to the left in FIG.
The a flows out to the surrounding space 10 through the opening 7c of the outer insulating nozzle 7a. On the other hand, the flow 12b split to the right in FIG. 6 includes the opening 7d of the inner insulating nozzle 7b, the opening 13 after the fixed electrode 1 is separated from the movable electrode 2, the opening 3a of the operation rod 3, and the fixed portion. It flows into the surrounding space 10 through the opening 5a of the puffer piston 5.

[Problems of Background Art] In such a puffer type gas circuit breaker, the compression chamber 6
Are always connected to the surrounding space 10 by the gas flow path 8, and a part of the gas starts to flow into the surrounding space 10 from the initial stage of the interelectrode operation. However, a normal gas circuit breaker does not show sufficient breaking performance because the distance between the electrodes is short immediately after opening, and the dielectric strength between the electrodes cannot withstand the regenerated voltage generated between the electrodes after arc extinction. Good blocking performance is exhibited only after a certain distance is opened. Therefore, the gas flowing out at the initial stage of the contact opening operation is completely wasted. Also,
In the puffer type gas circuit breaker, the gas pressure necessary for extinguishing the arc is created depending on the mechanical force applied from the outside as described above, but as described above, if a part of the gas constantly flows into the surrounding space, The conventional structure requires a larger driving force,
As a result, there is a drawback that the operation mechanism of the circuit breaker must be increased in size.

[Object of the Invention] The present invention has been made in view of the above problems, and an object thereof is to prevent outflow of gas at the initial stage of contact opening and to effectively use the gas for arc extinction to provide an excellent arc extinguishing ability. Another object of the present invention is to provide a gas circuit breaker in which the operating mechanism can be downsized so that it can be driven with a smaller driving force.

[Summary of the Invention] A gas circuit breaker of the present invention is provided with a second fixed electrode in addition to a first fixed electrode, and, on the movable side, a movable cylinder and a movable piston with respect to a fixed cylinder and a fixed piston. , A groove is provided behind the fixed cylinder, a compression chamber is formed between both pistons, an air storage chamber is formed behind the fixed piston, and a groove is formed between the movable contactor and the nozzle. In addition to the first gas flow path, the second gas flow path communicating with the first gas flow path and communicating with the compression chamber when the movable piston reaches the groove of the fixed cylinder, A third gas flow passage that guides arc energy to the gas storage chamber in the initial stage, and a fourth gas flow passage that connects the gas storage chamber and the compression chamber in the latter half of the opening operation are provided. Is.

Further, by having the above-described configuration, by preventing the gas from flowing out of the compression chamber in the initial stage of the opening operation, the gas can be effectively used in the arc extinguishing chamber and the opening operation can be performed. In the initial stage of (1), the gas pressure inside the gas storage chamber is increased by the arc energy, and this high-pressure gas is used for extinguishing the arc in the latter half of the opening operation, whereby the operating mechanism section can be miniaturized.

[Embodiment of the Invention] An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The same parts as those of the conventional puffer type gas circuit breaker shown in FIGS. 5 and 6 are designated by the same reference numerals and the description thereof will be omitted.

* Structure * In Fig. 1, a movable cylinder 14 is provided around the movable electrode 2.
However, the second fixed electrodes 15 are arranged on the outer circumference of the first fixed electrode 1, respectively. An insulating nozzle 7a is integrally fixed to the front surface of the movable cylinder 14 to form a first gas flow path 8 between the movable cylinder 14 and the movable electrode 2. This movable cylinder 14
Is inserted so as to slide in the fixed cylinder 16, and
Inside the movable cylinder 14, a movable piston 17 that forms a second gas flow path 19 with the movable cylinder 14 is provided. The diameter of the movable piston 17 is increased toward the operation mechanism portion side, the outer diameter of the end portion on the operation mechanism portion side is the same as the outer diameter of the movable cylinder 14, and the outer circumference of the end portion has a first The seal portion 17a is provided. On the other hand, fixed cylinder 16
A groove 18 is provided on the inner periphery of the end portion on the side of the operating mechanism, and when the first seal portion 17a provided on the movable piston 17 reaches the groove 18, the groove between the movable piston 17 and the fixed piston 21 is reached. The compression chamber 6 formed in the above and the second gas flow path 19 are communicated with each other. An air storage chamber 22 is formed between the fixed piston 21 and the operating rod 3, and is formed in the operating rod 3 via the outlet 20a formed in the operating rod 3 in the initial stage of the opening operation. The third gas flow path 20 and the air storage chamber 22 that have been opened are communicated with each other, and in the latter half of the opening operation, the air storage chamber 22
Is sealed. Further, a fourth gas flow path 24 constituted by a groove is provided on the outer circumference of the operation rod 3, and a second seal portion 25 provided on the inner circumference of the tip end portion of the fixed piston 21 reaches the same. The air storage chamber 22 and the compression chamber 6 are communicated with each other.

* Operation * FIG. 1 shows a closed state of the gas circuit breaker according to the present invention.
In the figure, the movable cylinder 14 is in electrical contact with the second fixed electrode 15, and the current flows through the second fixed electrode 15, the movable cylinder 14, and the fixed cylinder 16 in sliding contact with the movable cylinder 14. It flows through an outer path that flows through and a material path that is an inner path that flows through the first fixed electrode 1, the movable electrode 2, and the movable cylinder 14 that are electrically connected to the second fixed electrode.

When a cutoff command is given to the gas breaker, an operating mechanism (not shown) is activated to drive the movable cylinder 14 and the movable electrode 2 to the right in the figure. In this process, first, the second fixed electrode 15 and the movable cylinder 14 are separated from each other, and the current flows only through the path from the first fixed electrode 1 to the movable electrode 2 and the movable cylinder 14. After this state, the first fixed electrode 1 and the movable electrode 2 are separated,
As shown in the figure, an arc 11 is generated between both electrodes.

At the initial stage of the opening operation, the arc-extinguishing gas compressed in the compression chamber 6 cannot flow out of the compression chamber 6. Therefore, the pressure of the gas in the compression chamber 6 can be increased very effectively. When the first seal portion 17a provided on the movable piston 17 reaches the groove 18 provided on the inner surface of the fixed cylinder 16 as the opening operation progresses, the arc-extinguishing gas inside the compression chamber 6 becomes , Movable cylinder 14 and movable piston
The gas is blown to the arc 11 via the gas flow path 19 formed by the movable cylinder 14, the movable cylinder 14 and the insulating nozzle 7a, and the movable electrode 2, thereby extinguishing the arc.

On the other hand, in the initial stage of this opening operation, a part of the arc energy passes through the gas passage 20 formed in the operating rod 3 and the outlet 20a of the passage 20 and is stored behind the fixed piston 21. It flows into the chamber 22 and increases the gas pressure inside the gas storage chamber 22. When the opening operation progresses and the outlet 20a of the gas flow path 20 passes through the fixed seal portion 23, the arc energy is exhausted to the surrounding space 10, and the high pressure gas is stored in the gas storage chamber 22.

When the opening operation further proceeds and the second seal portion 25 reaches the gas flow path 24 constituted by the groove provided in the operation rod 3, the high pressure gas inside the gas storage chamber 22 flows through this gas flow path 24. After that, it flows into the compression chamber 6. With this mechanism, the gas pressure required for extinguishing the arc can be made to depend partly on the arc energy without depending on the mechanical driving force. This reduces the opportunistic driving force, that is, the operating mechanism section. It is effective for downsizing.

[Other Embodiments] In the above embodiments, the puffer type gas circuit breaker has been described as an example, but the gas circuit breaker of the present invention is not limited to this.
It is also possible to apply it to a gas circuit breaker that combines a self-extinguishing gas circuit breaker and a puffer type gas circuit breaker that blows arc-quenching gas that has received a portion of the arc energy and has increased pressure to the arc. .

FIG. 3 shows an embodiment of a structure in which the gas flowing out of the compression chamber 6 is blown to the arc through the pressure increasing chamber 26 which receives the arc energy, and FIG. 4 shows the gas flowing out of the compression chamber 6 in the pressure increasing chamber.
27 is an embodiment of the present invention in a gas breaker having a structure in which the gas from 26 is blown into the arc independently of the gas. It goes without saying that the same effect can be obtained in both cases.

[Effects of the Invention] As described above, according to the present invention, gas can be effectively used for arc extinction by preventing gas from flowing out of the gas compression chamber in the initial stage of the opening operation. ,
By making arc-extinguishing gas whose pressure is increased by using arc energy in the initial stage of the opening operation to flow into the gas compression chamber and increase the pressure in the gas compression chamber in the latter stage of the opening operation, a smaller driving force is obtained. It is possible to provide a gas circuit breaker in which the operating mechanism is miniaturized.

[Brief description of drawings]

FIG. 1 is a sectional view showing a closed state of a gas circuit breaker according to an embodiment of the present invention, FIG. 2 is a sectional view showing a cutting operation of the same embodiment, and FIGS. 3 and 4 are respectively according to the present invention. Sectional drawing which shows the closing state of the gas circuit breaker of other Example, 5th
FIG. 6 and FIG. 6 are sectional views showing a conventional puffer type gas circuit breaker in a closed state and during a breaking operation. 1 ... First fixed electrode, 2 ... Movable electrode, 3 ... Operation rod, 4 ... Puffer cylinder, 5 ... Puffer piston, 6 ... Compression chamber, 7a, 7b ... Insulation nozzle, 8, 19 , 20,24
...... Gas flow path, 11 …… Arc, 14 …… Movable cylinder, 15
…… Second fixed electrode, 16 …… Fixed cylinder, 17 …… Movable piston, 18 …… Groove, 21 …… Fixed piston, 22 …… Storing chamber, 26 …… Pressurizing chamber.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoru Yanagisa 2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Hamakawasaki Plant (72) Inventor Edmon Chiyuley Piyujinyan of France (69611) Liyu De Versailles 130

Claims (3)

[Claims] 1. A first fixed electrode and a movable electrode which are arranged so as to be able to come in contact with and separate from each other on a common central axis, and a cylindrical first gas which is located around the first fixed electrode and the movable electrode. An insulating nozzle that forms a gas outlet located around the flow path and the central axis, and a movable cylinder integrally fixed to the insulating nozzle are provided, and the first fixed electrode and the movable electrode are in contact with each other. In this case, the movable cylinder is in electrical contact with the movable cylinder, and when the first fixed electrode and the movable electrode perform the separating operation, they are separated from the movable cylinder prior to the separation of these electrodes. A second fixed electrode is provided, a fixed cylinder that is in sliding contact with the movable cylinder is provided on the outer periphery of the movable cylinder, and the first gas flow path is provided inside the movable cylinder between the movable cylinder and the movable cylinder. Second gas flow path communicating with each other A movable piston that is formed and slides in contact with the fixed cylinder is provided integrally with the movable cylinder, a gas compression chamber is formed between the movable cylinder and the movable piston, and the gas is stored behind it. A fixed piston that forms a chamber is provided, and a groove that connects the gas compression chamber and the second gas flow path is provided on the inner surface of the fixed cylinder after the movable piston has moved a first predetermined distance. The energy dissipated from the arc generated between the movable electrode and the first fixed electrode when the movable electrode and the first fixed electrode are separated is guided to the air storage chamber until the movable piston moves a second predetermined distance. After that, the third gas flow path for exhausting to the surrounding space and the storage chamber and the gas compression chamber after the energy dissipated from the arc is exhausted to the surrounding space through the third gas flow path. Room and 4th communicating
And a gas flow path for the gas breaker. 2. The gas circuit breaker according to claim 1, wherein the first gas flow path has a boost chamber in the middle thereof for receiving arc energy and increasing the pressure of the gas. 3. The gas circuit breaker according to claim 1, wherein the first gas flow path is provided independently of a pressure increasing chamber that receives arc energy and increases the pressure of the gas.