JPH02220319A - Buffer gas blast-circuit breaker - Google Patents

Abstract

PURPOSE:To blow the insulating gas of greater pressure to an arc by providing a pressure hole by which a buffer chamber and a hollow part are communicated together, and by forming a channel communicating with the outside of a buffer cylinder, inside the connecting member. CONSTITUTION:At the early stage of the operation of the gas blast-circuit breaker, an arc is generated between a fixed arcing contact 4 and a movable arcing contact 7, around which temperature is increased and the insulating gas is high-pressurized. A pressure hole 31 is opened at this time, and, though a part of the high-pressurized insulating gas is emitted from an inserting hole 11, most of the gas is infiltrated into a buffer chamber 9 through an emission passage 12 and the pressure hole 31, whereby the pressure inside the buffer chamber 9 is increased. At the last stage of the operation of the breaker, with a piston 17 fixed, the insulating gas in the buffer chamber 9 is compressed and is blown to an arc 19 from the emission passage 12. Since the pressure of the buffer chamber before pressurization is greater than usual, the insulating gas whose pressure is higher than usual is to be blown to the arc, and the ability for extinguishing arc is thus high.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a puffer type gas circuit breaker with improved breaking ability.

B. Summary of the Invention The present invention provides a puffer-type gas circuit breaker having a configuration in which insulating gas in a puffer chamber is blown onto an arc generated between a fixed arcing contact and a movable arcing contact when shutting off. By providing a pressurizing hole that communicates between the hollow part and the puffer chamber, and forming a flow path inside the connecting member that communicates with the outside of the puffer cylinder, the insulating gas whose pressure has increased due to the arc that occurs in the early stage of the shutoff operation can be removed. is moved to the puffer chamber, and higher pressure insulating gas is blown onto the arc.

C0 Conventional Technology A puffer type gas circuit breaker is used as a power circuit breaker.

The structure of a conventional puffer type gas circuit breaker is shown in FIG. As shown in the figure, the puffer type gas circuit breaker is composed of a fixed unit 1 and a movable unit 2. Fixed unit! is composed of a hollow fixed main contact 3 and a fixed arcing contact 4 provided at the center inside the main contact.

On the other hand, the movable unit 2 has a hollow part 5 and a movable arcing contact 7 at the tip thereof, and a drive rod 8 that is driven in the left-right direction in the figure, and a drive rod 8 that is fitted on the outside of the drive rod 8 and is connected to the drive rod 8. A puffer cylinder IO forms a puffer chamber 9, and is fixed to a buffer unlinder 10 so as to cover the movable arcing contact 7, and has an insertion hole 11 at its tip for airtightly inserting the fixed arcing contact 4 therethrough. and an insulating nozzle 13 forming a discharge path 12 between it and the movable arcing contact 7, a movable main contact 14 fixed to the outside of the insulating nozzle 13, and a hollow rod (connecting member) 16 attached to a fixed part (not shown). and a ring-shaped piston 17 that is slidably provided between the drive rod 8 and the puffer cylinder IO and serves as a suction/exhaust means for sucking in and discharging insulating gas into the puffer chamber 9. The reason why the contacts are divided into main contacts and arcing contacts is to distribute the functions so that they can be used properly. Note that 18 is a sealing material.

Each unit is provided in an insulating gas such as SFa gas, and constitutes a puffer type gas circuit breaker.

In such a puffer type gas circuit breaker, the drive rod 8
When the drive rod 8 is driven to the left in the figure and is charged, insulating gas is sucked into the puffer chamber 9 from the insertion hole 11, and when the drive rod 8 is driven to the right in the figure to shut off, the insulating gas is sucked into the puffer chamber 9. The insulating gas is discharged from the discharge path 12 as shown in FIG. The insulating gas is blown onto the arc 19 generated between the fixed arcing contact 4 and the movable arcing contact 7 to extinguish it, and is then discharged from the base end of the drive rod 8. The drive speed of the drive rod 8 is generally 8~
lom/s.

D8 Problem to be Solved by the Invention However, when interrupting a large current, the volume of the puffer chamber is increased, the drive stroke and drive speed of the drive rod are increased, and the pressure of the insulating gas is increased and the amount of discharged gas is increased. Therefore, it is difficult to interrupt large currents.

Therefore, an object of the present invention is to provide a puffer type gas circuit breaker that solves the above problems.

E3 Means for Solving Problem The present invention has a structure that achieves the above object by using a fixed arcing contact that is fixedly supported in an insulating gas, and a movable arcing contact that has a hollow portion into which the fixed arcing contact can be inserted and removed. A driving rod having a tip at its tip and being driven along the axis, a puffer cylinder attached to the driving rod, a piston provided in the puffer cylinder and fixed in space via a connecting member, and a movable arcing contact. An insulating nozzle that surrounds the tip to form a discharge path connecting the puffer chamber and the tip of the movable arcing contact between the movable arcing contact and an insertion hole in the tip for airtightly inserting the fixed arcing contact. The puffer type gas circuit breaker is characterized in that a pressurizing hole is provided to communicate the puffer chamber and the hollow part, and a flow path communicating with the outside of the puffer cylinder is formed inside the connecting member.

Since the pressurizing hole is open during the first half of the 28 action cutoff operation, the insulating gas that has become highly pressurized due to the arc generated between the fixed arcing contact and the movable arcing contact enters the puffer chamber from the pressurizing hole, and the puffer chamber is Increase the pressure of the insulating gas.

After the middle stage of the cutoff operation, the piston passes through the pressurizing hole to pressurize the insulating gas in the puffer chamber, and the pressurized insulating gas in the puffer chamber is blown onto the arc via the discharge path.

Since the pressure in the puffer chamber before pressurization is higher than before, a higher pressure insulating gas than before is blown onto the arc, resulting in higher arc extinguishing ability.

On the other hand, when the piston passes through the pressurizing hole, the hollow portion and the flow path communicate with each other via the pressurizing hole, and the insulating gas is discharged from the hollow portion via the flow path.

G. Examples Hereinafter, the present invention will be explained in detail based on examples shown in the drawings. Note that this embodiment is a partial improvement of the conventional puffer type gas circuit breaker, so the same parts as the conventional one are given the same reference numerals and explanations are omitted, and only the different parts will be explained.

(a) Structure of Example The structure of the puffer type gas circuit breaker according to the present invention is shown in FIGS.
This will be explained based on FIG.

As shown in the figure, a hollow portion 5 is formed inside the drive rod 8 on the distal end side, and the proximal end side is solid. A pressurizing hole 31 is formed in the drive rod 8 to communicate the hollow portion 5 and the puffer chamber 9.

A plurality of pressure holes 31 are provided along the circumferential direction.

On the other hand, as the hollow rod, a hollow rod 16a having a larger inner diameter than the conventional one is used. This is to form a flow path 32 between the hollow rod 16a and the drive rod 8, and the flow path 32 is connected to the outside of the puffer cylinder 10 and the first
It communicates on the right side of the figure (not shown).

The pressurizing hole 31 is set at a predetermined position along the axis of the drive rod 8 . This predetermined position is determined according to the specifications of the puffer type gas circuit breaker.

(b) Operation of the embodiment Next, the operation of the puffer type gas circuit breaker will be explained based on FIGS. 1 to 3.

When the drive rod 8 is driven to the right in the figure, the fixed arcing contact 4 is activated in the early stage of the start of interruption, as shown in FIG.
An arc 19 is generated between the movable arcing contact 7 and the movable arcing contact 7, the temperature around the movable arcing contact 7 rises, and the pressure of the insulating gas becomes high. At this time, the pressurizing hole 31 is open, and although some of the high-pressure insulating gas is released from the insertion hole 11, most of it passes through the discharge path 12 and the pressurizing hole 31 into the puffer chamber 9. Enter into puffer room 9
The pressure inside increases.

When the drive rod 8 moves further to the right and enters the latter half of the shutoff operation as shown in FIG. 19 is sprayed. The insulating gas is then released not only from the insertion hole 11 but also from the hollow part 5.
It is discharged to the outside of the puffer cylinder 10 through the pressure hole 31 and the flow path 32 . Since the pressure of the insulating gas compressed by the piston 17 is greater than that of the conventional one, the pressure of the insulating gas when blown onto the arc 19 is greater than that of the conventional one, and a large current can be interrupted in a short arc time.

H. Effects of the Invention As can be seen from the above explanation, the puffer type gas circuit breaker according to the present invention has the following effects.

A pressurizing hole that communicates between the hollow part and the puffer chamber is provided in the drive rod, and a flow path that communicates with the outside of the puffer cylinder and communicates with the pressurizing hole only during the latter half of the shutoff operation is provided, so that The insulating gas, which is heated by the arc and whose pressure has increased, enters the puffer chamber through the pressurizing hole, and is then blown onto the arc, and after extinguishing the arc exits the puffer cylinder via the pressurizing hole and the flow path. released. Therefore, the pressure of the insulating gas blown onto the arc from the puffer chamber is greater than in the past, and a large current can be interrupted in a short arc time.

In other words, this means that a large current can be interrupted without increasing the volume of the puffer chamber, expanding the stroke of the drive rod, or increasing the drive speed in order to obtain a large gas pressure. This also means that it can be made smaller.

[Brief explanation of the drawing]

Figures 1 to 3 relate to embodiments of the puffer type gas circuit breaker according to the present invention, Figure 1 is a sectional view of the puffer type gas circuit breaker when it is closed, and Figure 2 is a circuit diagram of the puffer type gas circuit breaker when it is closed. 3 is a sectional view of the puffer type gas circuit breaker in the latter half of the breaking operation, Figures 4 and 5 relate to a conventional puffer type gas circuit breaker, and Figure 4 is the puffer type gas circuit breaker. FIG. 5 is a cross-sectional view of the puffer type gas circuit breaker during the breaking operation. 4... Fixed arcing contact, 5... Hollow part,
7... Movable arcing contact, 8... Drive rod, 9... Puffer chamber, lO... Puffer cylinder,
11... Insertion hole, 12... Discharge path, 13... Insulating nozzle, 16... Hollow rod, 17... Piston, 3
1... Pressure hole, 32... Channel. Fig. 1 Parifa-type J-Kaki Φy 7-carrying t! Prisoner (Ho Teng Myung 4-
--Kuji 7-￥shiku゛ko; Tact 5--Ichichu? Evil 7---Machi 薊Archisik'Koshitact 8---J 呵-2=1 Niko 1011 Nodo・Go 9---Haha Sofa g! 1O---) - Nof 7 cylinder'' 11 - Drop pull L 12 - 11F each 13 - 11, 1, 1, 1, 1, 1, 16 -11F015 finished 32--Is it bald? Fig. 5 Cross-sectional view of the closed 8th gear of ``Novzufa type'' 1 x 1 (junior spear)

Claims (1)

[Claims] (1) A drive rod that has a fixed arcing contact that is fixedly supported in an insulating gas, a movable arcing contact that has a hollow part in which the fixed arcing contact can be inserted and removed, and that is driven along the axis, and a drive rod. A puffer cylinder attached to a rod, a piston provided in the puffer cylinder and fixed in space via a connecting member, and a piston provided surrounding the tip of the movable arcing contact connect the puffer chamber and the tip of the movable arcing contact. In a puffer-type gas circuit breaker consisting of an insulating nozzle having a discharge path formed between the movable arcing contact and an insertion hole formed at the tip thereof through which the fixed arcing contact is inserted airtightly, the puffer chamber and the hollow part are 1. A puffer-type gas circuit breaker, characterized in that a pressurizing hole for communication is provided, and a flow path communicating with the outside of a puffer cylinder is formed inside a connecting member.