JPS62206729A - Buffer type gas insulated 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] [Purpose of the invention] (Industrial application field) The present invention relates to an arc extinguishing chamber of a puffer type gas breaker.

(Prior Art) As the capacity of power transmission systems increases, the breaking capacity required of circuit breakers used in substations and switchyards also increases, and higher reliability is required. In order to increase the reliability of the circuit breaker, the number of parts must be reduced.

It is important to simplify the structure. Therefore.

Efforts are being made to reduce the number of breaking points in the circuit breaker.

Therefore, it is necessary to increase the breaking capacity per point of the breaker.

In conventional general puffer type gas breaker, it is necessary to increase the gas pressure in the puffer chamber in order to improve the breaker performance, and for this purpose, a large puffer cylinder is moved at a high opening speed.

If the gas in the puffer chamber is made high-pressure and blown onto the arc, the breaking capacity can be increased.

However, such a method not only increases the size of the arcing chamber but also requires a large drive device, making the breaker uneconomical to manufacture and operate.

(Problems to be Solved by the Invention) A method of utilizing arc thermal energy has been proposed as a method of suppressing the above-mentioned economic loss and efficiently increasing the gas pressure in the puffer chamber.

It has been found that if this thermal energy is used skillfully, the pressure of the gas in the puffer chamber can be increased and a powerful arc spray can be obtained, thereby improving the interrupting performance. However, since the hole through which hot gas blows out through the heat exhaust path in the hollow part of the drive rod is directly opposed to the inner surface of the puffer chamber, the inner surface can be damaged by the hot gas, causing incomplete operation such as straining when used repeatedly. There were drawbacks.

The present invention has been made in view of the above circumstances, and effectively utilizes the thermal energy of the arc at the time of interruption, and generates a
It is an object of the present invention to provide a puffer-type gas breaker that does not damage its sliding parts, has a long life, is compact, and has high breaking performance with low driving energy.

[Structure of the invention]

(Means for solving the problem) In a puffer-type gas breaker that blows compressed gas to the arc in a puffer chamber and exhausts the exhaust gas through the hollow part of the operating rod, the exhaust hole of the operating rod is The feature is that a protective wall is provided on the opposing parts.

(Function) By configuring the present invention as described above, heated exhaust gas emitted from the exhaust gas hits the protective wall.

It acts so that it does not hit the Pap cylinder directly.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

(Structure) FIG. 1 shows the state of the arc extinguishing chamber according to the present invention in the early stage of the breaker operation, and FIG. 2 shows the state in the later stage of the breaker action.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed contact portion, which is composed of a fixed arc contact 4 and a fixed current-carrying contact 3. Further, 2 is a movable contact portion, which includes a hollow drive rod 5 and a puffer cylinder 6° movable arc contact 8. A movable current-carrying contact 9 and an insulating nozzle 10 are fixed. In the movable contact portion 2, the puffer cylinder 6 forms a puffer chamber 11 with a puffer piston 7 fixed to a fixed portion (not shown). Further, in the movable part contactor part 2, the hole 5a communicating between the hollow part 5b of the drive rod 5 and the outside thereof is connected to the hollow part 5b of the drive rod 5 and the puffer chamber 1 at the initial stage of the shutoff operation, as shown in FIG.
1 is processed so as to communicate with each other.

(Fig. 1) As shown in Fig. 2, this hole 5a communicates with the hollow part 5b of the drive rod 5 and the surrounding gas space when it passes the inner diameter end 7a of the puffer piston 7 in the latter half of the shutoff operation. It is configured.

A convex portion 5c is provided at the rear end of the hollow portion 5b of the drive rod 5 to smoothly guide the flow of gas in the axial direction to the hole 5a.

A hot gas protection wall 14 is provided opposite the hole 5a and inside the inner surface of the puffer cylinder 6. Further, the hot gas protection wall 14 is provided with a hot gas diffusion preventing portion 14a, which has a U-shape when viewed in cross section as shown in FIG.

(Function) Next, the present invention will be explained in detail with reference to FIGS. 1, 2, and 3. As mentioned above, FIG. 1 shows the initial state of the cutoff operation. In this state, the arc 13 is generating a large amount of heat, but the nozzle 10 has not yet opened sufficiently, so there is no shutoff ability.

In addition, in the cutoff state shown in the figure, the hole 5 of the drive rod 5
Since the hole 5a has not yet passed the end 7a of the puffer piston 7, the hole 5a communicates with the inside of the puffer chamber 11.

On the other hand, at the beginning of such a cutoff, the puffer room 1
The pressure inside 1 has not increased much.

The expanding flow of gas from the arc 13 becomes a flow 12b passing through the hollow part 5b of the drive rod 5, and suddenly flows into the puffer chamber 1.
Although the expanded flow 12c flowing into the puffer chamber 11 also occurs in a conventional puffer-type gas breaker, the thermal flow 12b is very large and can therefore effectively impart heat to the gas within the puffer chamber 11. Since this is added to the original compression operation of the puffer piston 7 and the puffer cylinder 6, the pressure inside the puffer chamber 11 becomes even higher.

Thereafter, as shown in FIG. 2, the hole 5a passes through the end 7a of the puffer piston 7 and communicates around it.

Therefore, the hollow portion 5b of the drive rod 5 is open to the surrounding gas, and heat from the arc is released.

As shown in FIG. 2, this emitted hot gas would directly illuminate and damage the inner surface of the puffer cylinder if there was no hot gas protection wall 14. This damage causes a lot of friction between the puffer cylinder 6 and the puffer piston 7, causing sagging, etc. However, the presence of the hot gas protection wall 14 prevents hot gas from hitting the inner surface of the puffer cylinder 6.

Furthermore, if the end of the hot gas protection wall 14 is a flat plate, the hot gas that hits the end and bends may reach the inner surface of the puffer cylinder 6.
By providing 4a, the hot gas that hits the end and bends does not hit the inner surface of the puffer cylinder 6, making it possible to extend the life of the puffer cylinder 6.

[Other Examples]

In this embodiment, the puffer piston 7 and the hot gas protection wall 14 are provided separately. Another embodiment will be described with reference to FIGS. 4 and 5. Pillar 7 supporting puffer piston 7
By providing b at the position of the hot gas protection wall 14 and having the same shape as the hot gas protection wall 14, it can serve as both the support column 7b of the puffer piston 7 and the hot gas protection wall 14, which is very economical. . The other components are the same as those in this embodiment and have the same effect.

[Effects of the Invention] As described above, according to the present invention, a higher pressure increase can be obtained in the puffer chamber than in the conventional example.

With a small arc extinguishing chamber and a small drive device, it is possible to provide a puffer type gas breaker with high breaking performance.

Furthermore, as a result of providing a hot gas protection wall, problems such as galling with the puffer piston due to hot gas being blown onto the inner surface of the puffer cylinder and damaging it do not occur.
A highly reliable puffer type gas breaker can be provided.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the initial state of the shutoff operation of an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the late state of the shutoff operation of the embodiment of the present invention, and FIG. 3 is a second cross-sectional view. Figure 5 is the 4th
It is a cutaway view of the AA section of the figure. 1... Fixed contact part 2... Movable contact part 3.
・・Fixed current-carrying contact 4・・Fixed arc contact 5・
...Drive rod 5a...Drive rod hole 5b
... Drive rod hollow part 5c ... Convex part 6 ... Puffer cylinder 7 ... Puffer piston 7a ... Puffer piston end 8 ... Movable arc contact 9 ... Movable current-carrying contact 1
0... Insulated nozzle 11... Puffer chamber 12
...Gas flow 12a, 12b, 12cm Hot gas flow 13...Arc 14...Hot gas protection wall 14a...Hot gas diffusion prevention department representative Patent attorney Rules Near points Yudo Mitsumata Hiroshi Bunjiku Figure 2

Claims (3)

[Claims] (1) A container filled with arc-extinguishing gas has a fixed contact and a movable contact that can be moved in and out, and is driven by a puffer piston provided in the movable contact and an operating rod with a hollow tip. By compressing the puffer chamber, which is made up of a puffer cylinder, the gas in the puffer chamber is compressed and guided to the nozzle, and the gas is blown into the arc that is generated between the fixed and movable arc contacts as the breaker operates. Cooling and extinguishing the applied arc, providing a hole in the hollow part of the operating rod that drives the puffer cylinder, and communicating the hollow part of the operating rod and the puffer chamber through the hole at the initial stage of the breaker operation; In a puffer type gas breaker configured to isolate the hollow portion of the operating rod and the puffer chamber by the puffer piston during the latter half of the shutoff operation, a hot gas protective wall is provided on the puffer piston opposite to the hole. A characteristic puffer type gas breaker. (2) A patent claim characterized in that a member supporting the puffer piston that also serves as a hot gas protective wall is installed opposite the hole, and a U-shaped hot gas diffusion prevention part is attached to the member. The puffer type gas breaker according to item 1. (3) The length in the axial direction of the hot gas protection wall and the hot gas diffusion prevention part is longer than the length at least up to a position facing the hole in the cutoff state. The puffer type gas breaker according to item 2.