JPS5912524A - Buffer 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 [Technical Field of the Invention] The present invention provides a support structure for an operating rod of a buffer that compresses insulating gas through the action of a piston and a cylinder and extinguishes the arc by blowing it onto an arc, and a hollow portion of the operating rod. This invention relates to a buffer type gas breaker with an improved exhaust passage.

[Technical background of the invention]

In recent years, with the increase in voltage and capacity in power systems, the short-circuit current that must be cut off has increased rapidly, and there is a strong desire to increase the capacity per cutoff point and improve performance.

Therefore, a typical example of a conventional buffer type circuit breaker is shown in FIG. In FIG. 1, the left half shows a longitudinal sectional view of a so-called one-point support structure in which the operating rod of the movable electrode is supported at one point by a piston. In addition, the right half is a so-called 2-way system in which the operating rod is supported in two places: the piston and the piston support member.
These are vertical cross-sectional views of the point support structure, each showing a state in the middle of opening.

The fixed electrode (1) is fixed to a fixed electrode support member (2), and a cylindrical movable electrode (3) faces the fixed electrode (1).
is provided outside the bottom (6a) of the cylinder (6) of the buffer part [5j. Further, an operation rod (connected to a drive device (not shown) through force) is fixed to the inner center of the bottom (6a) of the cylinder (6) and has a hollow part (7a) that communicates with the movable electrode (3). The buffer section (
5) forms a buffer chamber) 9) by the cylinder (6) and the piston (8). Then, when opening the buffer chamber (9
) The internal insulating gas is compressed and the insulating gas is extinguished by spraying the arc Uυ generated between the fixed electrode (1) and the movable electrode (3) through the insulating nozzle On from the opening (9a).

The insulating gas sprayed by this arc αIlK is shown by the arrow [1
As shown in 2, the operating rod (7) is guided beyond the tip of the movable electrode (3), and the exhaust hole (131) provided in this operating rod (7) is connected to the υ operating rod (7) and the piston support member. - is discharged into the space I between the The pole support member (
2). The piston support member (8a) of the piston (8) is insulated and supported via an insulating cylinder a9, and the piston support member (8a) is provided with a discharge hole (8C).
form.

In such a conventional structure, in the case of a one-point support structure as shown in the left half of Fig. 1, sliding movement is required to stabilize the sliding movement between the piston (8) and the operating rod (7). A sliding portion (8b) is constructed by increasing the wall thickness of the side piston (8). In order to protect the sliding surface of the sliding part (8b) of the piston (8) even when the exhaust hole is closed, the exhaust hole 00 position is located below the piston (8), that is, the piston of the operating rod (7) in the closed state. (8) Open it in the position you removed it from.

In addition, as shown in the right half of Fig. 1, the piston support member (
Even in a two-point support structure in which a protruding support arm flf19 is formed in 8a) and the operating rod (7) is supported by the piston (8) and the support arm υ, an exhaust hole (, 13i) is provided to protect the sliding part. must be formed below the supporting mtie of the operating rod (7) when it is turned on.

[Problems with background technology]

However, even in the case of one-point and two-point support structures, if emphasis is placed on stable sliding movement between the piston stone 8) and the operating rod (7), the thickness of the piston (8) on the sliding side can be reduced. increases, or the position of the support arm Ui19 moves downward, so the position of the exhaust hole (131) becomes further away from the movable electrode (3), and the resistance loss of the exhaust passage increases accordingly, reducing the effectiveness of the insulating gas. This prevented spraying.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to provide a buffer type gas breaker that ensures stable operation of the operating rod and reduces resistance loss in the exhaust passage. be.

[Summary of the Invention] In order to achieve the above object, the present invention includes a fixed electrode section, a movable electrode section facing the fixed electrode section, and a buffer section adjacent to the movable electrode section, housed inside a grounded tank filled with an insulating gas. The buffer part is composed of a cylinder and a piston, and a movable electrode part is provided on one side of the cylinder, and a hollow part communicating with the cylindrical movable arc polarization of the movable electrode part is provided on the other side of the cylinder. fixing the operating rod with
During polarization, the arc generated between the fixed arc if pole of the fixed/electrode part and the movable arc electrode of the movable polarizing part is fixed to the operating rod that slides through the piston of the buffer part, and is driven. The arc is extinguished by blowing compressed insulating gas generated by the movement of the cylinder, and a part of the exhausted insulating gas passes through the movable arc electrode and the hollow part of the operating rod, and is formed on the operating rod. Exhaust is exhausted from the exhaust hole to the piston support member side, and the operating rod is slidably supported at two points by the penetrating sliding portion of the piston and the sliding support portion of the sliding support member provided at the end of the piston support member. By forming the exhaust hole of the rod to be located between the two sliding supports when opening and closing, it prevents the swinging of the operating rod as it is driven, and prevents the movable arc electrode and the hollow of the operating rod from swinging. It is characterized by reducing the passage resistance of the exhaust gas passage formed by the parts, thereby improving arc extinguishing performance and reliability.

Note that it is preferable that the exhaust hole provided in the operating rod be formed as a long hole extending in the axial direction of the operating rod.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A buffer type gas breaker according to an embodiment of the present invention will be described below with reference to the drawings. In Fig. 2, a buffer type gas breaker seals an insulating gas (21'a) such as SF gas inside a grounded tank Qυ, and also has a
Stores 22. In the illustration, there is only one breaker (2), but there are some in which two or more are connected in series.

Consisting of a breaker part (2-bar fixed electrode part (23), a movable electrode part (29) facing this, and a buffer part t2B provided adjacent to this movable electrode part (to). +23 is provided with a shield (5) on the lid (21b) side of the grounding tank (21), and the conductor (28a) connected via a connection part (not shown) is connected to an insulating spacer (28b) provided at the bottom of the outlet. It is airtightly supported by the movable electrode part (the buffer part (2EO) is provided adjacent to the cylinder (21), which will be described later), and is led out to the outside.
One end of the operating lot part 30 that drives the part 1 is fixed. Further, a piston support member Gυ that supports a piston (not shown) is supported and fixed to the operating mechanism case or center piece (to) K via a supporting insulating cylinder C33. Centerpiece (
The outer connecting member (39 is a slide contact) (3[i)'f: is provided to be fixed to the outer connecting member (39), and the fixation is fixed to the pole part (39) via the slide contact (to) that slides on the outer periphery of the cylinder (to). A current path is formed between the movable pole part (c) and the center piece (c). And fixed! An insulating cylinder C3 containing a shield and a cut-off part t23 between the pole part t231 and the outer peripheral support member C
7).

In Fig. 3, the breaker part (2) indicates the closed pole, that is, the closed state.The fixed electrode part (c) has a fixed arc pole 01 in the center of the fixed electrode mounting member (to), and this fixed anine electrode Fixed current-carrying contact +4 surrounding the area (to)
1 will be provided. In addition, the fixed electrode mounting member (to) has a communication hole (
38a) is provided.

A movable electrode part is provided outside the bottom part (29a) of the cylinder of the buffer part. A movable arc electrode (41) in the shape of a camphor tree is provided approximately at the center of the movable electrode portion (2) and the bottom (29a), and an insulating nozzle is provided around the movable arc electrode (41) to form a gas flow path (42a). In addition, a movable current-carrying contact 93 is provided around the bottom (29a) where the insulating nozzle (42) is attached.
Through the opening (29b) formed in the bottom (29a),
It communicates with the buffer chamber (which will be described later).The bottom part (29a) has a hollow part (3) which communicates with the cylindrical movable arc electrode (4I).
One end of the operating rod (7) having a hole (0a) is fixed, and the other end is connected to, for example, an insulating rod (4) which is connected to an operating mechanism (not shown). 'b) form.

The buffer part C119 is a cylinder (2 cylinders) and a piston (40 cylinders).
A buffer chamber (44) is formed from the above. The piston inserted inside the cylinder 01 (aD is the piston support member (3)
Sliding support member by υ (support and holding insulating cylinder C
It is fixed to I. The operating rod 01, which has one end fixed inside the bottom (29a) of the cylinder 01, has a piston (4
When it passes through the center of f9 and is slidably supported by the penetrating sliding part (46a), it passes through the tomo trap and sliding support member (pierces and is slidably supported by the sliding support part (4&a). The operation rod (:!A is the penetrating sliding part (46a)
) and a sliding support part (48a) at a position distant from this in the axial direction.

In addition, when the pole is closed, the exhaust hole (3) of the operating rod (to)
0b) is located near the through-sliding part (46a) of the piston (2), and when opening the exhaust hole (30
b) is formed so as to be located near the sliding support part (48a). (See Figure 4) Also, the piston support member c31
) is formed with a sufficiently large exhaust window (:na).

Next, the effects of the present invention will be explained. FIG. 3 shows the closed or closed state. When an opening or cutting command is input to the breaker (21), as shown in FIG. (to) is driven to compress the insulating gas inside the buffer chamber formed by the piston (41) and the opening (
29b), the arc generated between the fixed arc electrode (to) and the movable arc electrode (01) via the gas flow path (42a).
Spraying insulating gas to 51 extinguishes the arc. A part of this insulating gas flow passes through the hollow part (30a) of the operating rod (toward) beyond the tip of the cylindrical movable arc electrode (41), and passes through the exhaust hole (30a).
0b) to the exhaust window (31a) of the piston support member G1)
is exhausted through the Further, the other part of the insulating gas flow is exhausted to the fixed arc electrode C (+3 side).

Along with such a shutoff operation, the operating rod (to) is connected to the penetrating sliding portion (46a) of the piston (■) and the sliding support portion (48a).
Since it is slidably supported by two points spaced apart in the axial direction, it is possible to prevent vibration when the operating rod (to) and cylinder cover are driven, and stable shutoff operation is possible.

In addition, the exhaust hole (30b) of the operation rod (to) is connected to the penetrating sliding part (46a) and the sliding support part (48a) during closing and opening operations.
), and is formed so as not to damage the respective sliding surfaces. That is, since it is formed in the vicinity of the penetrating sliding part (46a) and the sliding support part (48a), it is possible to connect the movable arc electrode (41) to the exhaust hole (30b).
) is shorter than before.

Therefore, the passage resistance of a part of the exhaust gas that has passed through the movable arc electrode (41) can be reduced, and the breaking performance can be improved. Furthermore, the exhaust passage resistance can be further reduced by forming the exhaust hole (30b) as an elongated hole to increase the sound of the cross-sectional area of the hole.In this way, the exhaust hole (30b), the exhaust window (
By exhausting the air to the inner wall side of the grounded tank (not shown) through 31a), it is possible to prevent the exhaust from blowing into the operating mechanism section (not shown).

〔Effect of the invention〕

As explained above, according to the buffer type gas breaker of one embodiment of the present invention, a part of the exhaust of the insulating gas that is blown onto the arc and extinguished when the arc is cut off passes through the hollow part of the movable arc electrode and the operating rod. It reduces the flow path resistance of the gas discharged from the operating rod's exhaust hole, improves arc extinguishing performance, and prevents the operating rod and cylinder from swinging during operation by supporting the operating rod at two separate points along the axial direction. By doing so, it is possible to improve the interrupting performance and also improve the reliability.

[Brief explanation of drawings]

Fig. 1 shows the breaking section of a conventional buffer-type gas breaker, the left half is a one-point support structure, the right half is a vertical cross-sectional view of a two-point support structure, and Fig. 2 is a buffer-type gas breaker according to an embodiment of the present invention. A partially cutaway side sectional view of the gas breaker, FIGS. 3 and 4 are vertical sectional views of the breaker in the closed state and the closed state of FIG. 2, respectively, and FIG. FIG. Q...Grounded tank (21a)...Insulating gas (24...Shutoff section (To)...Fixed electrode section (C)...Movable electrode section (A)...Buffer section (To) ...Cylinder (to)...Operating rod (30a) Exhaust hole 01) Piston support member (3ta)...Exhaust window Ca...Support insulating tube (to)...Center piece 9...Outer connection member ( To) Slide contact G [Fixed arc's bridge (40... Fixed current-carrying contact (41) Movable arc electrode (43... Insulated nozzle device/movable current-carrying contact (44... Buffer chamber C4119 piston (46a) ) Penetrating sliding part (481...Sliding support member (48a) Sliding support part 6I Arc agent Patent attorney Inoue -Male

Claims (1)

[Claims] (11) A fixed electrode part, a movable electrode facing the fixed electrode part, and a buffer part adjacent to the movable electrode part are housed inside a grounded tank filled with an insulating gas, and this buffer part is connected to a cylinder. and a piston to form a buffer chamber, and the movable electrode portion provided on one side of the cylinder includes a cylindrical movable arc electrode and an insulating nozzle attached to form a gas flow path outside the moat. an opening communicating between the gas flow path and the buffer chamber is formed in the cylinder, and an operating rod having a hollow portion communicating with the cylindrical movable arc electrode is fixed to the other side of the cylinder; The cylinder is driven by the operating drive of this operating rod, and the operating rod slides through the piston, and an arc is generated as the fixed arc electrode and the movable arc electrode of the fixed electrode section are separated. When extinguishing the arc by blowing compressed insulating gas from the buffer chamber through the gas flow path, a portion of the insulating gas flow is passed through the movable electrode and the hollow part of the operating rod, and is directed into the operating rod. Exhaust air is discharged to the piston support member side of the piston through the formed exhaust hole, and the operating rod is connected to a through-sliding portion of the piston and a sliding support portion of a sliding support member provided at an end of the piston support member. (K), the exhaust hole of the operating rod is positioned between the penetrating sliding part and the sliding support part during opening and closing driving operations of the operating rod. A buffer type gas breaker characterized by the following: (2) Claim 1 in which the exhaust hole provided in the operating rod is formed as a long hole along the axial direction of the operating rod.
Buffer type gas breaker as described in section.