JPS62143329A - Buffer type gas-blast 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 an arc extinguishing chamber of a puffer type gas breaker.

[Technical background of the invention and its problems]

As the capacity of power transmission systems increases, the breaking capacity required of circuit breakers used in substations and switchyards also increases, and high reliability is also required. To improve the reliability of the breaker, reduce the number of parts.

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 single point breaking capacity of the circuit breaker.

In order to improve the breaking performance of a conventional general puffer type gas breaker, the breaking capacity can be increased by gassing the puffer chamber and making the gas in the puffer chamber high pressure and blowing it against the arc.

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

As a method of suppressing such economic losses and efficiently increasing the gas pressure in the puffer chamber, a method of utilizing the thermal energy of the arc has been proposed.

It has been found that by skillfully utilizing this thermal energy, it is possible to increase the pressure of the gas in the puffer chamber and obtain powerful arc spray, thereby increasing the shutoff performance.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and is a puffer type gas breaker that is compact and yet achieves high breaking performance with low driving energy by effectively utilizing the thermal energy of the arc during breaking. It is an object of the present invention to provide.

[Summary of the invention]

In order to achieve the above object, the present invention utilizes the arc energy at the initial stage of the breaker operation of a puffer-type gas breaker to be taken into the puffer chamber through the hollow part of the drive rod, to increase the pressure rise in the puffer chamber, and to In the latter stages of operation, the hollow part of the drive rod is used as a heat exhaust path, and the exhaust gas hits nothing.
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It is characterized by

[Embodiments of the invention]

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

FIG. 1 shows the state of the arc extinguishing chamber according to the present invention in the early stage of the shutoff operation, and FIG. 2 shows the state in the latter half of the shutoff operation.

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, and a puffer cylinder 6, a movable arc contact 8, a movable energizing contact 9, and an insulating nozzle 10 are fixed to a hollow drive rod 5. In the movable part contactor part 2, the puffer cylinder 6 is
A puffer 11 is formed with the puffer piston 7 fixed to a fixed part (not shown). In the movable part contactor part 2, as shown in FIG. It is processed so that the inside is connected. (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. The inner diameter end 7a of the puffer piston 7 is made of an arc-resistant material such as iron or fluororesin. In FIG. 3, the end 7a is attached to the puffer piston 7 by screwing or gluing. A convex portion 5c is provided at the rear end of the hollow portion 5b of the drive rod 5 for smoothly guiding the flow of gas in the axial direction to the hole 5a.

[Effect of the embodiment]

Next, the present invention will be explained in detail with reference to FIGS. 1 and 2. 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 breaking ability. Further, in the cut-off state shown in the figure, the hole 5a of the drive rod has not yet passed the end 7a of the puffer piston 7, so the hole 5a communicates with the inside of the puffer chamber 11.

On the other hand, at such an early stage of interruption, the pressure in the puffer chamber II has not increased much, so the arc 1
The expanded flow of gas from the rod 5 becomes a flow 12b passing through the hollow portion 5b of the rod 5, and rapidly flows into the buff/air chamber 11. The expansion flow 12c also occurs in a conventional puffer-type gas breaker, but the flow 12b due to heat
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 in the puffer chamber 11 becomes even higher.

Thereafter, as shown in FIG. 2, the hole 5a passes through the end 7a of the 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. At this time, since the end portion 7a is made of a heat-resistant material, it will not be damaged by heat. In particular, since the end 7a also serves as a bearing for the operating rod 5, if the end 7a is damaged by heat, the operating rod 5 and the end 7a will not slide smoothly. In this state, the nozzle IO is already sufficiently open, so the current can be cut off.
The heat taken up in the puffer chamber Il is distributed almost uniformly within the cylinder, so that the high pressure rise persists until the end of the shutoff operation. Therefore, high-speed gas flow is blown onto the arc for a long period of time, so high breaking performance can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, a higher pressure rise can be obtained in the puffer chamber than in the conventional example, so a puffer type gas breaker with high breaking performance can be provided using a small arc extinguishing chamber and a small drive device. can do.

Furthermore, the end of the puffer screw (6), which faces the hole drilled on the side of the operating rod, is made of heat-resistant fully bent or non-metallic material, which reduces damage to the puffer piston due to hot gas discharge and increases the length of the puffer piston. It is possible to provide a puffer type gas circuit breaker with a long life.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the initial state of the cut-off operation of an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the late state of the cut-off action of the embodiment of the present invention, and FIG. It is a partial enlarged view of a chamber part. 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, 12c...
・Hot gas flow 13... Arc agent Patent attorney Nori Chika Ken Yudo Hirofumi Mitsumata Figure 2

Claims (2)

[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 and A hole is provided in the hollow part of the operating rod that cools and extinguishes the blown arc and drives the puffer cylinder, and at the initial stage of the breaker operation, the hollow part of the operating rod and the puffer chamber are communicated through the hole. , in a puffer type gas breaker configured to isolate the hollow part of the operating rod and the puffer chamber by the puffer piston during the latter half of the shutoff operation,
A puffer-type gas breaker, characterized in that an end portion of a puffer piston on which the operating rod slides is made of a heat-resistant material. (2) The puffer type gas sheath disconnector according to claim 1, wherein the heat-resistant material is an iron material or a fluororesin material.