JPS6388724A - Buffer type gas breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a puffer type gas circuit breaker. relates to a puffer-type gas circuit breaker in which the operating rod and puffer piston have been improved so that the force can be effectively utilized.

(Prior Art) High-pressure gas circuit breakers that spray arc-extinguishing gas such as SF6 gas onto the arc are widely used because they easily withstand high voltage. Among them, puffer-type gas circuit breakers, which compress arc-extinguishing gas using the driving force generated when the contacts break and spray the compressed gas onto the arc, have become the mainstream of high-pressure circuit breakers because they have a simple groove.

In recent years, with the increase in short-circuit capacity due to the increase in the number of power transmission products, puffer-type gas circuit breakers have been
The number of mothers is also increasing. On the other hand, in order to downsize devices, efforts are being made to increase the breaking capacity per point and reduce the number of series breaking points of the circuit breaker. For this reason, the breaking performance of the circuit breaker requires optimization of the electric field design between the poles of the circuit breaker as well as the gas blowing mechanism.

In conventional general puffer-type gas circuit breakers, in order to improve their breaking performance, it is necessary to increase the pressure inside the puffer chamber, and for this reason, a large puffer cylinder is operated at a very fast opening speed. , the gas in the puffer chamber? :JJJI is used to spray on the arc, increasing the interrupting performance.

However, in the above method, the dimensions of the arc-extinguisher must be made extremely large, and a large drive device is required, which not only increases the manufacturing cost of the circuit breaker but also requires a large amount of effort to operate it. The disadvantage was that it was expensive.

Therefore, although this is not known to the public, the applicant proposed methods for effectively increasing the gas pressure in the puffer chamber as shown in FIGS. 3 to 5.
We are proposing a method that utilizes the thermal energy of the arc, as shown in the figure (). That is, the movable contact part 2 is arranged opposite to the fixed contact part 1 which is composed of the fixed arc contact 4 and the fixed current-carrying contact 3.

Further, the movable contact section 2 includes a puffer cylinder 6, a movable arc contact 8, a movable energizing contact 9, and an insulating nozzle 10 fixed to a hollow operating rod 5. A puffer piston 7 fixed to a fixed part (not shown) is disposed inside the buffer cylinder 6, and the puffer cylinder 6 and the puffer piston 7 move the buffer 77
A chamber 11 is formed.

Furthermore, a plurality of communication holes 5a are formed in the hollow operating rod 5, and the hollow portion 5b of the operating rod 5 communicates with the outside. Further, a convex portion 5C is provided at the rear end of the communication hole 5a to smoothly guide the axial gas flow in the hollow portion 5b of the operating rod 5 to the communication hole 5a.

The communication hole 5a is arranged so that the hollow part 5b of the operating rod 5 communicates with the inside of the puffer chamber 11 during the closing time shown in FIG. 3 and at the beginning of the shutoff operation shown in FIG. In the latter half of the shutoff operation shown in FIG.
The hollow portion 5b of the gas chamber 5b is configured to communicate with the surrounding gas space.

In the conventional puffer type gas circuit breaker configured in this manner, when an arc 13 is generated between the fixed arc contact 4 and the movable arc contact 8, the arc 13 generates a large amount of heat. Further, at this time, the communication hole 5a formed in the operating rod 5 does not pass past the inner diameter end 7a of the puffer piston 7, so the communication hole 5a communicates with the inside of the puffer chamber 11.

At the beginning of such a shutoff operation, the pressure inside the puffer chamber 11 has not increased much due to the compression action of the puffer piston 7, so the expanding flow of gas from the arc 13 flows through the hollow portion 5b of the operating rod 5. The flow becomes the flow 12b that passed through and rapidly flows into the puffer chamber 11. Also, arc 1
An expansion flow 12C flowing between the movable arc contact 8 and the insulating nozzle 10 is also generated from the hollow part 5 of the operating rod 5.
The expanded flow 12b flowing into the puffer chamber 11 is very large and can therefore effectively impart heat to the gas in the puffer chamber 11. This heat is transferred to the puffer piston 7 and the puffer cylinder 6.
As a result, the pressure of the arc-extinguishing gas in the puffer chamber 11 becomes extremely high due to the synergistic effect of the expansion action due to heat and the compression action by the puffer piston 7.

Thereafter, as the shutoff operation progresses, the communication hole 5a passes through the inner diameter end 7a of the puff 7 piston 7 and communicates with the surrounding gas space, as shown in FIG.

Therefore, the hollow portion 5b of the operating rod 5 is open to the surrounding gas space, and the heat from the arc 13 is released to the outside.

In this state, the insulating nozzle 10 has already separated from the fixed arc contact 4 and is sufficiently opened, so that the current can be interrupted. Also, puffer to 11
The heat taken into the pant cylinder 6 is
Since the pressure is distributed almost evenly, the high pressure rise persists until the end of the shutoff operation. Therefore, since a high-speed gas flow is blown onto the arc for a long time, high breaking performance can be achieved.

In this way, by effectively utilizing the thermal energy generated by the arc, it is possible to increase the gas pressure inside the puffer chamber, and as a result, the powerful arc blowing can obtain force, greatly improving the interrupting performance. can be increased to

However, as mentioned above, if the thermal energy of the arc is taken into the puffer chamber without limit, the pressure inside the puffer chamber will be increased and the shutoff performance will be improved, but the pressure inside the buffer 1 will become too high, and the Due to the reaction force caused by this, the driving energy has to be increased, and the operation mechanism has to be enlarged.

Furthermore, if too much thermal energy of the arc is taken into the puffer chamber, the density of the gas may decrease and the ability to extinguish the arc by blowing may decrease.
It was desired to appropriately control the inflow into the room.

(Problems to be solved by the invention) As mentioned above, in the conventional buff 1 type gas circuit breaker,
Since it was not possible to control the pressure rise in the puffer chamber, the pressure in the puffer chamber became too high, and due to the reaction force caused by that pressure, the driving energy had to be increased and the operating mechanism had to be made larger. There wasn't.

Furthermore, if too much thermal energy of the arc is taken into the puffer chamber, the density of the gas decreases, and the ability to extinguish the arc by spraying may decrease.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks.The purpose of the present invention is to appropriately control the inflow of the thermal energy of the arc generated at the time of interruption into the buffer chamber 1, thereby reducing the size and size of the buffer.
Moreover, it is an object of the present invention to provide a puffer type gas circuit breaker that can obtain high breaking performance with small driving energy.

[Structure of the Invention] (Means for Solving the Problems) The puffer type gas circuit breaker of the present invention has a floating piston movable in the same direction as the puffer piston disposed within the puffer cylinder and in front of the puffer piston. the floating piston is fixed to the puffer piston by a spring, an energy storage chamber is formed between the floating piston and the puffer piston, and an operating rod for driving the puffer cylinder is configured in a hollow shape, A communication hole is provided on the side surface, and the communication hole communicates the hollow part of the operating rod with the puffer palm in the early stage of the shutoff operation, and connects the hollow part of the operating rod with the storage chamber in the latter half of the shutoff operation. It is structured so that it communicates.

(Function) The puffer-type gas circuit breaker of the present invention sends the thermal energy of the arc at the initial stage of the breaking operation into the puffer chamber through the communication hole formed in the side surface of the hollow part of the operating rod, thereby increasing the pressure inside the buffer 1. At the same time, the floating piston arranged in front of the puffer piston is pushed backward to appropriately control the pressure rise in the puffer chamber.In addition, in the latter half of the shutoff operation, the communication hole of the operating rod is connected between the floating piston and the puffer. The gas is sent into the storage chamber formed between the pistons, increasing the pressure for changing the storage direction and pushing the floating piston forward, increasing the compression effect of the gas in the puffer chamber and spraying the arc-extinguishing gas. has greatly improved power.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to FIGS. 1 and 2. Note that the same members as those of the conventional type shown in FIGS. 3 to 5 are designated by the same reference numerals, and explanations thereof will be omitted.

*Configuration of Example In this example, as shown in FIG. 2 is placed.

Further, the movable contact section 2 includes a puffer cylinder 6, a movable arc contact 8, a movable energizing contact 9, and an insulating nozzle 10 fixed to a hollow operating rod 5. A puffer piston 7 fixed to a fixed part (not shown) is disposed inside the buffer 7 cylinder 6, and a floating piston 21 is disposed on the front surface of the puffer piston 7. 7, and the puffer piston 7 and the floating piston 21 form an energy storage chamber 23. Roughly speaking, the puffer cylinder 6 and the floating piston 21 form a puffer to 11.

Further, the communication hole 5a formed in the operating rod 5 is connected to the hollow portion 5b of the operating rod 5 at the initial stage of the shutoff operation as shown in FIG. to 11, and during the latter half of the blocking VfI operation as shown in FIG.
1, the hollow portion 5b of the operating rod 5 and the energy storage chamber 23 are configured to communicate with each other.

Operation of Nido Embodiment* The operation of the puffer type gas circuit breaker of this embodiment having such a configuration will be explained. That is, when an arc 13 occurs between the fixed arc contact 4 and the movable arc contact 8 in the initial state of the breaking operation shown in FIG. 1, the arc 13 generates excessive heat, but the insulation Since the nozzle 10 is not yet fully opened, it does not have the ability to shut off. Also, at this time, the communication hole 5a formed in the operating rod 5 does not pass through the inner diameter end 21a of the floating screws 1 to 21 disposed on the front surface of the barafun piston 7, so the communication hole 5a
communicates with the inside of the puffer chamber 11.

On the other hand, at the beginning of such a shutoff operation, the puffer chamber 1
1 has not increased significantly due to the compression action of the puffer piston 7, the expanding flow of gas from the arc 13 flows through the hollow portion 5b of the operating rod 5 into the flow 12b.
and suddenly flows into the puffer chamber 11. Further, the expansion flow 12G flowing from the arc 13 between the movable arc contact 8 and the insulating nozzle 10 also occurs in the conventional puffer type gas circuit breaker, but the flow 12b due to heat is very large, so the puffer Heat can be effectively applied to the gas within the chamber 11. This heat causes puffer piston 7
This adds to the original compression operation of the puffer cylinder 6, so
The pressure within the buffer 7 chamber 11 becomes extremely high.

In particular, in this embodiment, when the pressure within the puffer chamber 11 increases, the floating piston 21 is pushed rearward (toward the puffer 7 piston 7 side). In this way, by converting a part of the arc energy into a force that compresses the spring 22 disposed between the floating piston 21 and the puffer piston 7, the pressure increase in the puffer chamber 11 can be optimized. .

Thereafter, as the shutoff operation progresses, the communication hole 5a formed in the operating rod 5 passes through the inner diameter end 21a of the floating piston 21 and communicates with the energy storage chamber 23, as shown in FIG. Therefore, the hollow portion 5b of the operating rod 5 communicates with the energy storage chamber 23, and the expanded flow 12b of gas from the arc 13 flows into the energy storage chamber 23.
3 and the arc energy is taken into the energy storage chamber 23.

As a result, the floating piston 21, which had been pressed backwards, is pressed forward due to the restoring force of the compressed spring 22 and the pressure increase in the storage chamber 23, so that the puffer chamber 11
The arc-extinguishing gas inside is compressed.

In such a state, the insulating nozzle 10 has already separated from the fixed arc contactor 4 and is sufficiently opened, so that the current can be interrupted.

In addition, the heat taken into the puffer chamber 11 is dispersed almost uniformly within the puffer cylinder, and the floating piston 21 compresses the gas in the puffer chamber 11, so that a high pressure rise can be prevented by a shutoff operation. It continues until it ends. Therefore, a high-speed gas flow is blown onto the arc for a long period of time, so that high breaking performance can be obtained.

In this way, since the pressure rise in the gap and blank can be appropriately controlled, the operating rod can be driven with small drive energy, and there is no need to increase the size of the operating mechanism section. Furthermore, since the thermal energy of the arc taken into the puffer potato can be appropriately controlled, the density of the gas does not decrease and a high arc extinguishing ability can be maintained.

[Effects of the Invention] As described above, according to the present invention, a floating piston fixed by a spring is disposed on the front surface of the puff 7 piston, and the communication hole formed in the operating rod is shut off. In the latter stages of the communication and cutoff operations, the inflow of the thermal energy of the arc generated during cutoff into the puffer chamber is appropriately controlled by a simple means of communicating with the energy storage chamber formed between the puffer piston and the floating piston. By doing so, it is possible to provide a puffer-type gas circuit breaker that is compact and provides high interrupting performance with low driving energy.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing one embodiment of the buff 1 type gas circuit breaker of the present invention. 3 to 5.
The figures are cross-sectional views showing an example of a conventional puffer type gas circuit breaker. This shows the late stage of operation. 1... Fixed contact part, 2... Movable contact part, 3...
・Fixed current-carrying contact, 4...Fixed arc contact, 5...
・Operation rod, 5a...Communication hole, 5b...Operating rod hollow part, 5C...Convex part, 6...Puffer cylinder, 7...Puffer piston, 7a...Inner diameter end of puffer piston Part, 8... Movable arc contactor, 9...
Movable energizing contact, 10... Insulating nozzle, 11... Puffer chamber, 12a, 12b, 12G... Hot gas flow, 1
3... Arc, 21... Floating piston, 21a...
・Inner diameter end of floating piston, 22...Spring, 23...
・Storage room.

Claims (1)

[Claims] (1) In a container filled with arc-extinguishing gas, there is a puffer chamber that has a fixed contact part and a movable contact part that can be moved in and out, and a puffer piston and a puffer cylinder provided in the movable contact part. In a puffer-type gas circuit breaker that compresses gas and guides it to a nozzle part to cool and eliminate an arc occurring between a fixed arc contact and a movable arc contact, A floating piston movable in the same direction as the puffer piston is disposed in front of the puffer piston, the floating piston is fixed to the puffer piston by a spring, and an energy storage chamber is formed between the floating piston and the puffer piston, In addition, the operating rod that drives the puffer cylinder is formed into a hollow shape, and a communication hole is provided in the side surface of the operating rod, and the communication hole is configured such that at the initial stage of the shutoff operation,
A puffer type gas circuit breaker, characterized in that the hollow part of the operating rod and the puffer chamber are communicated with each other, and the hollow part of the operating rod and the energy storage chamber are communicated with each other in the later stage of the shutoff operation.