JPH0294332A - Buffer type gas cutoff device - Google Patents

Abstract

PURPOSE:To improve the insulation recovery characteristic between electrodes so as to make it possible to shorten the distance between the electrodes by providing a heat hole, which is blocked during the latter stage of a cutoff start process, between a heat gas chamber and a movable arcing contact. CONSTITUTION:During the former stage of a cutoff start, an arc is produced between two arcing contacts, and insulating gas whose pressure is raised by the heat of arc inflows in a heat gas chamber 23 not only from a discharge path 12 but from a heat hole 28. When the cutoff start reaches from its middle stage to the latter stage, the heat hole 28 start closing, and the insulating gas in the heat gas chamber is blown toward the arc, through the discharge path 12 without being leaked, extinguishing the arc. Thereafter, the insulating gas, which is pushed out of a buffer chamber 9 by a piston 17, is blown to a position between the two arcing contacts through the discharge path 12. In this way, the insulation recovery characteristic between electrodes can be improved thus the distance between the electrodes for cutoff can be shortened.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to the structure of a puffer type gas circuit breaker.

B3 Summary of the Invention The present invention provides a puffer-type gas circuit breaker that extinguishes the arc by blowing insulating gas in the puffer chamber onto the arc when separating the movable arcing contact from the fixed arcing contact. The movable arcing contact side in the sofa room is used as a hot gas chamber.
By providing a hot hole between the hot gas chamber and the inside of the movable arcing contact, which is closed in the latter half of the start of interruption, the insulating gas in the hot gas chamber, whose pressure has increased due to the arc energy, is blown against the arc, thereby increasing the gap between the electrodes. This improves the insulation recovery characteristics and shortens the distance between poles.

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. The fixed unit 1 is composed of a hollow fixed main contact 3 and a fixed arcing contact 4 provided at the center of the main contact.

On the other hand, the movable unit 2 has a hollow part 5 and a communication hole 6, and a drive rod 8 whose tip part becomes a movable arcing contact 7 and is driven in the left-right direction in the figure. The puffer cylinder 10 forms a puffer chamber 9 between the drive rod 8 and the drive rod. 8, a movable main contact 14 fixed to the outside of the insulating nozzle 13, and a hollow rod 1 having an exhaust hole 15.
The ring-shaped piston 17 is attached to a fixed part (not shown) via a ring 6 and is slidably provided between the drive rod 8 and the puffer cylinder 10.

Note that 18 is a sealing material. Each unit is provided in an insulating gas such as SF or 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. of 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 exhausted through the insertion hole 11 or the communication hole 6 and the exhaust hole 15. . Drive rod 8
The driving speed is generally 8 to 10 rn/s.

D1 Problem to be Solved by the Invention However, with the increase in the capacity of power systems, puffer type gas circuit breakers are required to have a large amount of power per interruption and a large breaking current. Type gas circuit breakers have the following issues.

(b) In order to improve the interrupting performance, it is necessary to increase the pressure in the puffer chamber and spray high-pressure insulating gas until the arc is extinguished. It is necessary to drive the drive rod at high speed with a large stroke, but this not only increases the size of the puffer cylinder, but also requires a drive means with a large driving force, which increases the size of the drive means and requires a large amount of drive energy. Therefore, the cost becomes high.

(b) On the other hand, if the drive rod is driven at high speed, the circuit breaker becomes large and heavy, which reduces the reliability of the mechanical structure and operating parts.

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

Means for Solving Problem E1 The structure of the present invention for achieving the above object fixes a rod-shaped fixed arcing contact in an insulating gas, while
The opening side of a puffer cylinder having a substantially bottomed cylindrical shape is fixed to a drive rod that is reciprocated along the axis of a fixed arcing contact, and the tip of the fixed arcing contact can be inserted into and removed from the pipe-shaped movable arcing contact. The approximately middle part in the length direction is passed through the center of the bottom of the puffer cylinder and fixed.

A fixed rod, which is formed into a pipe shape and whose tip is slidably inserted into the base end of the movable arcing contact, is fixed in a space in an insulating gas, and a piston is provided inside the puffer cylinder, and the piston is is fixed to the fixed rod with the fixed rod passing through its center,
By forming a partition wall connecting the base end of the movable arcing contact and the inner peripheral surface of the puffer cylinder, a hot gas chamber sandwiched between the puffer cylinder and the movable arcing contact and a puffer chamber sandwiched between the puffer cylinder and the fixed rod are created. By forming a communication hole in the partition wall and connecting an insulating nozzle to the bottom of the puffer cylinder so as to cover the movable arcing contact, a discharge path through which the hot gas chamber and the tip of the movable arcing contact communicate can be moved. Formed between the arcing contact and the insulating nozzle,
It is characterized by forming a hot hole that communicates the hot gas chamber with the inside of the movable arcing contact.

F1 operation cut-off begins.Above, an arc is generated between both arcing contacts, and the insulating gas whose pressure increases due to the heat flows into the hot gas chamber not only through the discharge path (but also through the hot hole).

In the middle to late stages of the start of interruption, the hot hole begins to close, and the insulating gas in the hot gas chamber passes through the discharge path without leaking from the hot hole and is blown onto the arc, extinguishing the arc. after that,
The insulating gas forced out of the puffer chamber by the piston is blown through the discharge channel between both arcing contacts, improving the insulation recovery characteristics.

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 buffer-5-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 Embodiment The structure of a puffer type gas circuit breaker according to the present invention will be explained based on FIG. 1.

As shown in the figure, the opening side of the puffer cylinder 10, the right side in the figure, is fixed to the tip of a drive rod 8 that is reciprocated. The opening of the puffer cylinder 10 has a closed shape in this embodiment, and has a plurality of open holes 2 along the circumferential direction.
1 is formed. A communication hole 6 is formed in the drive rod 8.

On the other hand, a fixed rod 16 formed in a pipe shape and having its base end fixed to a fixed part (not shown) is slidably provided inside the drive rod 8, and its tip end is connected to the base end of the movable arcing contact 7. It is slidably inserted. A piston 1 provided inside the puffer cylinder 10
A fixed rod 16 passes through the center of the piston 7, and a piston 17 is fixed to the fixed rod 16. The fixed rod 16 has an exhaust hole 1 that communicates with the communication hole 6 when shutting off, as shown in FIG.
5 is formed.

A partition wall 22 is formed inside the puffer cylinder 10 and connects the inner circumferential surface of the puffer cylinder 10 to the base end of the movable arcing contact 7. A puffer chamber 9 formed by a partition wall 22 and a puffer cylinder 1
0. A movable arcing contact 7 and a hot gas chamber 23 formed by a partition wall 22 are configured.

The partition wall 22 is connected to a hot gas chamber 23 from the puffer chamber 9.
A plurality of communication holes 26 and check valves 27 are provided so that the insulating gas can flow only into the insulating gas. Further, the piston 17 is provided with a plurality of intake holes 24 and check valves 25 so that the insulating gas can flow only from the outside to the inside of the puffer chamber 9 .

In addition, a plurality of hot holes 28 are formed around the movable arcing contact 7. The heat hole 28 is provided at a predetermined position so as to be closed by the tip of the fixed rod 16 when the heat hole 28 is shut off.

Furthermore, in this embodiment, a shield 22 is attached to cover the outer peripheral surface of the movable arcing contact 7.

(b) To start the operation of the embodiment, drive the drive rod 8 to the left in FIG. 1, and fit the tip of the fixed arcing contact 4 into the movable arcing contact 7. At this time, the fixed rod 16 moves from its fixed position to the right side of the piston 17 relative to the puffer cylinder 1o, and the insulating gas outside the puffer cylinder IO passes through the open hole 21 and the intake hole 24. and is inhaled into the puffer chamber 9.

Next, to perform the shutoff, as shown in FIG. 2, the drive rod 8 is driven to the right in the figure. Then, the movable arcing contact 7 moves a little away from the fixed arcing contact 4, and an arc 19 is generated between the poles, and the insulating gas, which has become high temperature and high pressure due to the heat of the arc 19, thermally expands. From only hot hole 28 to the third in the middle period
As shown in the figure, the hot gas chamber 2 is
Move to 3. Therefore, the pressure of the insulating gas in the hot gas chamber 23 increases. After that, when the insulating gas in the puffer chamber 9 is pushed out from the communication hole 26 by the piston 17,
At the same time, as shown in FIG. 3, the tip of the fixed rod I6 begins to block the hot hole 28, and as a result, as shown in FIG.
These insulating gases are blown onto the arc 19 and extinguished through the insertion hole 11 and the exhaust hole 15. Communication hole 1
6. Subsequently, the insulating gas in the puffer chamber 9 is blown onto the arc 19, and after the arc is extinguished, the insulation recovery characteristics between the electrodes rapidly increase, and the interrupting characteristics are improved. The insulating gas that has become high temperature and high pressure due to the arc 19
The arc can be interrupted in a short period of time.

As the breaking current increases, the arc energy also increases, more insulating gas collects in the hot gas chamber, and the breaking ability also increases.

Figure 5 shows the pressure with respect to the position of the puffer cylinder when the position of the puffer cylinder at the time of closing is set to 0. (a) shows the pressure in the puffer chamber of a conventional puffer type gas circuit breaker, ) is the pressure in the hot gas chamber of the puffer type gas circuit breaker according to the present invention. As shown in the figure, when the buffer unlinder moves to the right, the pressure increases, but in the puffer type gas circuit breaker according to the present invention, the pressure increases rapidly at position P, and it can be seen that the pressure increases faster than in the conventional case.

- As described in detail of the H1 invention, according to the puffer type gas circuit breaker according to the present invention, the pressure of the insulating gas rapidly increases and collects due to the heat of the arc generated between the fixed arcing contact and the movable arcing contact, and then A hot gas chamber that automatically blows air onto the arc has the following effects.

(a) As the breaking current increases, the arc energy also increases, and the pressure of the insulating gas that gathers in the hot gas chamber also increases, and high-pressure insulating gas is blown onto the arc, so the arc is extinguished in a short time, and then the puff The compressed insulating gas in the chamber improves the insulation recovery characteristics between the poles. Therefore, the distance between poles for cutting off becomes small.

(b) Since the insulating gas in the hot gas chamber is sufficient to extinguish the arc, there is no need for a conventional means of blowing insulating gas onto the arc at high speed. The stroke can be reduced, the driving means can be made smaller by reducing the opening speed, and the driving energy can be reduced, resulting in lower costs.

<c> By reducing the opening speed, it is possible to avoid increasing the size and weight of the circuit breaker, and the reliability of its mechanical performance is greatly improved.

In addition, since the hot hole is formed, the insulating gas heated by the arc will gather in the hot gas chamber from both the discharge path and the hot hole, and the pressure in the hot gas chamber will rise in a short time. Go,
Higher pressure insulating gas can be blown onto the arc.

Furthermore, since the hot holes are closed when the insulating gas in the hot gas chamber is released toward the arc, the insulating gas is released toward the arc only from the release path, resulting in high arc extinguishing ability.

Furthermore, since a portion of the puffer chamber is formed by a fixed rod, the driven parts are lightweight and the operating energy is reduced.

[Brief explanation of the drawing]

Figures 1 to 5 relate to an embodiment of the puffer type gas circuit breaker according to the present invention, in which Figure 1 is a cross-sectional view in the closed state, Figure 2 is a cross-sectional view at the early stage of the start of shutoff, and Figure 3 is the middle stage of the start of shutoff. FIG. 4 is a cross-sectional view at the latter stage of the start of shutoff, FIG. 5 is a graph showing pressure changes between the puffer chamber and the hot gas chamber, and FIG. 6 is a cross-sectional view of a conventional puffer type gas circuit breaker. 4... Fixed arcing contact, 5... Hollow part,
7... Movable arcing contact, 8... Drive rod, 9... Puffer chamber, 10... Puffer cylinder, 12... Discharge path, 13... Insulating nozzle, 16...
・Fixed rod, 17... Piston, 22... Bulkhead,
23... Hot gas chamber, 26... Communication hole, 27... Check valve, 5... Check valve, 28... Heat hole. 24... Intake hole, 2 people outside Figure 3 LFR side view of a bar, edge-type curved circuit breaker (midway of the start of breaking) Figure 2 Cross-sectional view of a T-type curved circuit breaker (breaking amount )
Fig. Cross-sectional view of a puffer-forming force shield WFR device (conventional) Fig. shows how the puffer chamber and the fins receive pressure from the gas chamber. Application No. 247739 2, Name of the invention: Puffer-type gas circuit breaker 3゜Relationship with the case of the person making the amendment Applicant (610) Meidensha Co., Ltd. 4゜Submersion 1-29 Akashi-cho, Chuo-ku, Tokyo 104, Japan Saikai Pill December 20, 1988 7, insert [3. Detailed description of the invention] between the first and second lines of page 3 of the statement of contents of the amendment. that's all

Claims (1)

[Claims] (1) A rod-shaped fixed arcing contact is fixed in an insulating gas, and the opening side of a puffer cylinder with a bottom is fixed to a drive rod that is reciprocated along the axis of the fixed arcing contact. A pipe-shaped movable arcing contact, into which the tip of the arcing contact can be inserted and removed, penetrates and is fixed at the center of the bottom of the puffer cylinder, so that it is formed into a pipe shape and has a movable arcing contact at the tip. A fixed rod that is slidably inserted into the base end of the contact is fixed in a space in an insulating gas, and a piston is provided inside the puffer cylinder, with the fixed rod passing through the center of the piston. fixed on the fixed rod,
By forming a partition wall connecting the base end of the movable arcing contact and the inner peripheral surface of the puffer cylinder, a hot gas chamber sandwiched between the puffer cylinder and the movable arcing contact and a puffer chamber sandwiched between the puffer cylinder and the fixed rod are created. A communication hole is formed in the partition wall, and an insulating nozzle is connected to the bottom of the puffer cylinder so as to cover the movable arcing contact, thereby making it possible to move the discharge path through which the hot gas chamber and the tip of the movable arcing contact communicate. Formed between the arcing contact and the insulating nozzle,
A puffer-type gas circuit breaker characterized by forming a hot hole that communicates between a hot gas chamber and the inside of a movable arcing contact.