JPS6210824A - Buffer type 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] 5゛[Technical Field of the Invention] The present invention relates to S
This relates to gas cylinders and disconnectors filled with arc-extinguishing gas such as F6 gas.

[Technical Background of the Invention] High-pressure gas circuit breakers that spray an arc-extinguishing gas such as SF6 gas onto an arc are widely used because they easily withstand high voltages. Among these, puffer-type gas circuit breakers, which compress arc-extinguishing gas using the driving force generated when the contacts are opened, have a simple structure and are therefore the mainstream of high-pressure 1B circuit breakers.

FIG. 3 shows a cross section near the arc extinguishing chamber of such a puffer type gas breaker. A pair of opposing arc contacts includes a fixed arc contact 1 and a movable arc contact 2. The movable arc contactor 2 , the nozzle 3 and the puffer cylinder 4 configured around the movable arc contactor 2 are both connected to an operating rod 6 . Puffer cylinder 4
is extrapolated to the puffer piston 5.

With such a configuration, when shutting off, a command is sent to the drive unit, the operating rod 6 is driven by oil pressure or a spring, etc., and the movable arc contactor 2, nozzle 3, and puffer cylinder 4 are moved. During this movement, the movable arc contact 2 separates from the fixed arc contact 1 and an arc is generated between the two contacts. On the other hand, the puffer cylinder 4 compresses the gas by the relative movement between the puffer screws 1 to 5, and blows the gas into the generated arc through the nozzle 3. As a result, the arc is cooled and cut off at the current zero point. That will happen.

In this way, the puffer-type gas breaker creates compressed gas as the electrodes open, so it is always 1.
rThere is no need to hold high pressure gas.

[Problems with Background Art] However, on the other hand, in the puffer type, it is necessary to drive the puffer cylinder 4 against the differential pressure between the compressed gas and the surrounding gas pressure. This X pressure is related to the current interrupting ability of the puffer type gas breaker. In other words, as the cutoff current increases, the current reduction rate at the current zero point increases,
As a result, higher pressure gases are required and greater drive energy is used along with the electrical current.

Puffer gas? The driving energy of the disconnector mainly consists of two components. One is the kinetic energy for opening the whole at a constant speed, and the other is the gas energy for compressing the gas. The latter has a large dependence on the cutoff current -4=, whereas the former has a high dependence on the voltage.

That is, the higher the voltage, the higher the voltage applied between the contacts. For this reason, for example, it is necessary to increase the opening speed and increase the gap length according to the voltage, such as advanced small current cutoff, and the kinetic energy increases accordingly.

Incidentally, an increase in driving energy has the disadvantage of increasing the size of the driving part and increasing costs.Furthermore, it increases mechanical stress on each moving part, impairing long-term life. There are also problems. Additionally, the acceleration to the base increases, making it necessary to make the foundation even stronger.

As described above, an increase in drive energy causes various problems, and therefore reducing the drive energy has become an important issue. As mentioned above, it is difficult to reduce kinetic energy among drive energy, but various methods have been considered for gas energy.

In order to reduce gas energy, the use of arc energy to increase gas pressure has been widely used.However, in the conventional puffer type gas breaker as shown in Fig. Even if the gas pressure is increased with the energy of Reducing gas energy is difficult.

On the other hand, if the puffer operation is not performed at all,
□ Self-boosting type gas circuit breakers have been considered, but such gas circuit breakers have a new problem: the pressure does not increase when the current is small, and the smaller the current, the lower the breaker performance becomes. will occur.

[Object of the Invention] The present invention was proposed in view of the above-mentioned problems, and its purpose is to miniaturize the driving part and reduce costs by enabling a configuration that can minimize gas energy. It is an object of the present invention to provide an excellent puffer type gas breaker which reduces the mechanical stress on each movable part and extends its life.

[Summary of the Invention] The puffer type gas breaker of the present invention has an enclosing plate on the outside of the movable arc contact attached to the tip of the operating rod, which is shaped to cover from the outer peripheral surface of the movable arc contact to the front of the tip.
(2) Attach the tip of the puffer cylinder to the outer periphery of the central part of the surrounding plate, and fix the nozzle that forms a gas passage between it and the surrounding plate to the nozzle holder on the outer periphery of the surrounding plate at the tip of the puffer cylinder. As a result, the gas passage is divided into a relatively wide passage inside the enveloping plate and a narrow passage between the nozzle and the enveloping plate, thereby suppressing an increase in gas pressure.

Then, the puffer cylinder is slidably inserted onto a puffer piston fixed to a container or the like, and annular partition plates are provided on the driving part side of the surrounding plate and on the tip side of the puffer piston, respectively.
By slidingly inserting both the inside and outside, and by providing a hole at the end of the outer partition plate for passing through the inside and outside during the early stage of opening, the puffer chamber is divided into the inside and outside at the later stage of opening, and the reaction force is Since the applied cross-sectional area can be reduced, electrode opening can be performed with small drive energy.

[Embodiment of the Invention] An embodiment of the puffer type gas breaker according to the present invention as described above will be specifically described with reference to FIG. Note that the same parts as those in the prior art described above are designated by the same reference numerals, and the description thereof will be omitted.

*Structure* Fig. 1 is a diagram showing a cross section near the arc extinguishing chamber of an embodiment of the puffer type gas breaker according to the present invention, and the arc extinguishing chamber is
It is held in a container filled with SF6 gas or the like via an insulator or the like.

In the figure, a fixed arc contact 1 and a movable arc contact 2, which are a pair of opposing contacts, are arranged in the arc extinguishing chamber. The movable arc contactor 2 is fixed to the tip of an operating rod 6, and the operating rod is connected to a drive section (not shown).

An enclosure 10 is provided on the operating rod 6 coaxially with the movable arc contact 2 and has a shape that covers the area from the outer peripheral surface of the movable arc contact 2 to the front of the tip and has a frontage at the tip. The inner periphery of the tip of the puffer cylinder 4 is attached to the outer periphery of the central part of the enclosure 10 so as to be coaxial with the operating rod 6.
Therefore, the part of the enclosure on the driving part side is the puffer cylinder 4.
included in In front of the tip of the puffer cylinder 4,
A nozzle 3 that includes the outer circumferential surface of the front half of the enclosure 1o to the front of the tip and forms a gas passage with the enclosure 1o, and has an opening at the tip is attached with a nozzle holder 9. . Furthermore, holes 11 and 12 are provided in the axial direction at the connection portion between the operating rod 6 and the enclosure 10, and at the connection portion between the puffer cylinder 4 and the enclosure 10, respectively.
The latter hole 12 passes through the first buffer chamber 13 on the inside and the inside of the enclosure 10, and the latter hole 12 passes through the second buffer chamber 14 on the outside and the gas passage inside the nozzle 3 (around the enclosure 10).

The puffer cylinder 4 is slidably fitted onto a puffer piston 5 fixed to a container via an insulator or the like. Inside the puffer cylinder 4, -〇- A partition plate 20 extends toward the driving portion side of the enclosure 10, and is inserted into a partition plate 21 extending toward the tip end side of the puffer piston 5. . In addition, several long holes 15 are provided on the tip side of the partition plate 21 of the puffer piston.
is being pulled.

Note that 7 in the figure is a fixed current-carrying contact, and 8 in the figure is a current collector.

-4 (Function*) The function of the present invention having the above configuration is as follows.

That is, when the breaker is closed, the fixed arc contact 1 and the movable arc contact 2, and the fixed current-carrying contact 7 and the nozzle holder 9 are in electrical contact, respectively, as shown in FIG. When an opening command is given in this state, the drive section operates and the operating rod moves in the opening direction. According to this opening operation, the nozzle holder 9 first separates from the fixed current-carrying contact 7,
Subsequently, the movable arc contactor 2 separates from the fixed arc contactor 1, an arc is generated between the two throwers, and the gas inside the enclosure 10 is heated.

Further, at the same time as the above-described electrode opening operation, the gas in the puffer chamber is compressed by the relative movement of the puffer cylinder 4 and the puffer piston 5. This compressed gas is
0 A hole 11 that communicates the inside with the inner puffer chamber, and a hole 1 that communicates the gas passage in the nozzle 3 with the outer puffer chamber.
2 to the enclosure 10 and the gas passage in the nozzle, respectively.

In this case, since the gas within the envelope 10 is heated by the heat of the arc and the pressure has increased, the gas flows backward into the puffer chamber inside the envelope 10 until the current reaches the zero point.

In addition, in the initial stage of contact opening, the elongated hole 15 provided in the second partition plate 21 allows the inside and outside of the first. 2nd puffer room 1
3.14 are in communication, the inner and outer first and second buffer chambers 13 and 14 are compressed at the same pressure.

After opening, as shown in FIG. 2, the inner and outer first and second puffer chambers 13.14 are divided by the action of the first and second partition plates 20.21. Therefore, each puffer chamber 13,14 is compressed independently, and at the current zero point, cooling gas is transferred from the outer puffer chamber 14 via the gas passage between the enclosure 10 and the nozzle 3 to the inner puffer chamber. 13, high-pressure gas is released through the enclosure 10, and is blown onto the arc to extinguish it.

Therefore, according to this embodiment, by providing the enclosure 10 to separate the inner and outer gas passages, the gas pressure in the puffer chamber can be reduced.
In addition, by installing the partition plates 20° and 21, the reaction force caused by the arc can be confined within the inner puffer chamber and the cross-sectional area to which the reaction force is applied can be reduced, making it possible to open the electrode with small drive energy. Therefore, the configuration of the drive unit can be downsized and costs can be reduced. In addition, the mechanical stress on each movable part can be reduced, which can contribute to extending the service life. Furthermore, in the latter stage of electrode opening, high-pressure gas and cooling gas are effectively supplied and act on the arc, so arc extinguishing performance can be improved.

Note that the present invention is not limited to the above embodiments, and the shape and dimensions of each member can be selected as appropriate.

[Effects of the Invention] As explained above, according to the present invention, an enclosing plate is provided around the movable arc contactor, and a partition plate is provided in the puffer cylinder, so that the puffer chamber is divided into inner and outer puffer chambers in the latter stage of opening. This configuration suppresses the rise in gas pressure in the puffer chamber and reduces the cross-sectional area to which reaction force is applied, reducing the driving force for opening, reducing costs and extending life. At the same time, it is possible to provide a puffer type gas breaker with improved arc extinguishing performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the vicinity of the arc extinguishing chamber showing the closed state of an embodiment of the puffer type gas breaker of the present invention, and FIG. 2 is a sectional view of the vicinity of the arc extinguishing chamber showing the open state of the same embodiment. Cross section, 3rd
The figure is a sectional view showing an example of a conventional puffer type gas breaker. DESCRIPTION OF SYMBOLS 1... Fixed arc contactor, 2... Movable arc contactor, 3... Nozzle, 4... Buff 1 cylinder, 5...
・Buff 7 piston, 6... Operating rod, 7... Fixed current-carrying contact, 8... Current collector, 9... Nozzle holder,
10... Surrounding plate, 11.12... Hole, 13.14.
... Puffer chamber, 15... Long hole, 20... Partition plate of enclosure, 21... Partition plate of puffer piston.

Claims (1)

[Claims] (1) A pair of movable and fixed arc contacts are placed in a container filled with arc-extinguishing gas such as SF_6 gas, and the movable arc contact is driven by a drive unit to open and close between the contacts. A puffer type that drives the puffer piston or puffer cylinder at the same time as the arc contact, compresses the arc extinguishing gas through the relative movement of the two, and blows the compressed arc extinguishing gas onto the arc generated between the contacts to break it off. In the gas breaker, a movable arc contactor is attached to the tip of the operating rod connected to the drive part, and the shape includes the outer peripheral surface of the movable arc contactor to the front of the tip part on the outside thereof, and has a frontage part at the tip part. A surrounding body is provided, and the inner periphery of the tip of a puffer cylinder arranged coaxially with the operating rod is attached to the outer periphery of the central part of the surrounding body, and the puffer cylinder slides onto a puffer piston fixed to a container etc. In front of the tip of the puffer cylinder, a nozzle that forms a gas passage with the surrounding body is fixed to the outer periphery of the surrounding body with a nozzle holder, and a connecting part between the operating rod and the surrounding body and a connection between the nozzle and the puffer cylinder are fixed to the outer periphery of the surrounding body. The connection part is provided with holes that pass through the puffer chamber and the enclosure, and between the puffer chamber and the gas passage in the nozzle, and furthermore, annular holes are provided on the driving part side of the enclosure and on the tip side of the puffer piston, respectively. 1. A puffer type gas breaker, characterized in that a partition plate is provided, each partition plate is slidably inserted inside and outside, and a hole is provided at the end of the inner or outer partition plate for communication between the inside and outside at the initial stage of opening.