JPH0896676A - Gas-blast circuit-breaker - Google Patents

Abstract

PURPOSE: To provide a gas-blast circuit-breaker by which an arc can be speedily, safely and reliably extinguished by preventing damage of an apparatus, and speedily translocating an electric current. CONSTITUTION: A fixed electrode part (a) arranged opposite to a movable electrode part (b) is arranged on one end of a pressure vessel 22 constituting a puffer device. The fixed electrode part (d) and the movable electrode part (b) having a current-carrying contactor 19 and an arc contactor 20 and the pressure vessel 22 are arranged in a coaxial shape. A puffer cylinder 11 and a rod 17 are integrally formed, and a cylinder side coil 14 is arranged on the opposite side of the fixed electrode part (a) of the puffer cylinder 11, and a piston side coil 15 inversely turning to the cylinder side coil 14 is connected to the opposite side of a puffer chamber 13 of a piston 12, and both coils are arranged in parallel in the coaxial direction with the rod 17. A spring 18 to energize the piston 12 is arranged on the opposite side of the puffer chamber 13 of the piston 12, and a holding device 16 of the piston 12 is arranged on the side where the fixed electrode part (a) of the rod 17 is not arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker for turning on and off an electric current in a power transmission system, and in particular, an arc generated when the electric current is cut off and turned on without damaging the device. The present invention relates to a puffer type gas circuit breaker capable of safely and reliably extinguishing an arc.

[0002]

2. Description of the Related Art The demand for electric power is still increasing and the higher voltage of the power transmission system is advancing accordingly. In this high-voltage power transmission system, a gas circuit breaker having an excellent arc extinguishing capability is used because quick, safe and reliable interruption of an accident current is required.

As a kind of such a gas circuit breaker, one which extinguishes the arc by utilizing the magnetic flux generated by the drive coil is disclosed in, for example, the Japanese Utility Model Publication 59-128136 shown in FIG.
Japanese Patent Publication No. That is, FIG. 4 is a cross-sectional view of an electrode structure in a gas circuit breaker, in which the fixed electrode portion and the movable electrode portion are provided with a current-carrying contact and an arc contact, respectively. In the figure, the insulating container 1 has an airtight structure, and is filled with an arc-extinguishing insulating gas such as SF6 gas at a predetermined pressure. The fixed electrode portion is provided on the upper portion of the insulating container 1 having such heat resistance. That is, the cylindrical upper conductor 2 having the lower half portion as the fixed current-carrying contact 3 is attached to the upper portion of the insulating container 1. Inside the fixed energizing contact 3, a cylindrical fixed arc contact 6 and a driving coil 8 around the fixed arc contact 6 are arranged coaxially with the fixed energizing contact 3. One end of the drive coil 8 is connected in series around the fixed arc contact 6 and the other end is connected to the fixed energization contact 3 via the conductive piece 9. Further, the fixed energizing contact 3, the fixed arc contact 6, the drive coil 8 and the conductive piece 9 are integrated by an insulating resin filled in a mold portion 10 which is an internal space of the fixed energizing contact 3. On the other hand, the movable energizing contactor 4 constituting the movable electrode portion is biased inward in the radial direction by the contact pressure spring 5, and a tubular movable arc contactor 7 is arranged inside the movable energizing contactor 4 coaxially therewith. Further, the fixed energization contactor 3 and the movable energization contactor 4 constituting the fixed electrode portion as described above, and the fixed arc contactor 6 and the movable arc contactor 7 constituting the movable electrode portion respectively operate as the movable electrode portion. It is configured to have a sliding contact portion that opens and closes by.

In the above-described gas circuit breaker having such a structure, when the movable electrode portion moves during the closing operation, the movable arc contactor 7 first contacts the lower end of the fixed arc contactor 6, and then the movable energizing contactor. 4 is operated so as to come into contact with the fixed energizing contact 3 from the outside. At this time, the current mainly flows through the path of the upper conductor 2, the fixed conducting contact 3, the movable conducting contact 4 and the lower conductor (not shown). Further, when the movable electrode portion moves in the direction of moving away from the fixed electrode portion during the breaking operation, the movable current-carrying contactor 4 first moves away from the fixed current-carrying contactor 3. At this time, the current is the upper conductor 2 → fixed conducting contact 3 → conductive piece 9 →
The drive coil 8 is commutated to the path of the fixed arc contact 6 → the movable arc contact 7 → the lower conductor (not shown), and the drive coil 8 is excited. Next, the movable arc contactor 7 is operated so as to be separated from the fixed arc contactor 6, and at this time, an arc A is generated between both arc contactors. Since the arc A is linked with the magnetic flux generated by the drive coil 8, a rotational force is applied to the arc A and the arc A rotates at high speed. Therefore, the insulating gas is relatively blown to the arc A,
As a result, the arc A is cooled and extinguished at the current zero point.

[0005]

The conventional gas circuit breaker as described above has the following problems. During the opening operation, the fixed energizing contact 3 and the movable energizing contact 4 are first separated. At that time, since the fixed arc contactor 6 and the movable arc contactor 7 are in contact with each other, if the driving coil 8 is not provided, the electric current will be the fixed arc contactor 6 and the movable arc contactor 7.
Commute easily to. However, since the drive coil 8 is provided to apply the magnetic field to the arc A, the resistance thereof makes it difficult for the current to flow through the fixed arc contact 6 and the movable arc contact 7. Therefore, when the fixed energizing contactor 3 and the movable energizing contactor 4 are opened, a large potential difference is generated between the two energizing contactors. At this time, a large discharge is generated in the fixed energizing contact 3 and the movable energizing contact 4, the surfaces of both energizing contacts are damaged, and current is applied to the fixed arc contact 6, the moving arc contact 7 and the drive coil 8 side. There was a risk that the commutation would not be possible. In this case, the circuit breaker as a safety device may cause a catastrophic disaster.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
Even with a circuit breaker that has a drive coil, it is possible to prevent damage to the sliding contact part and the contact surface by reducing the sudden potential difference between the fixed electrode part and the movable electrode part when the contact is opened, and to speed up the current flow. (EN) Provided is a gas circuit breaker capable of promptly, safely and reliably performing a duty operation of extinguishing arc by diverting.

More specifically, the first object of the present invention is to
In a gas circuit breaker that has a puffer chamber consisting of a puffer cylinder and a puffer piston on the fixed electrode side, the puffer cylinder or puffer piston moves to the puffer chamber's It is an object of the present invention to provide a gas circuit breaker that can drive a puffer piston at the time of opening the electrode by driving in a direction of expanding the volume with a simple structure, effectively and surely.

A second object of the present invention is to provide a gas circuit breaker capable of reliably holding the once expanded puffer chamber volume in the closed state of the circuit breaker.

A third object of the present invention is to provide a gas circuit breaker having a puffer chamber composed of a puffer cylinder and a puffer piston on the side of the movable electrode, in which case the coil provided on the puffer cylinder and the puffer piston acts as a circuit breaker. By driving the puffer cylinder or puffer piston in the direction that expands the volume of the puffer chamber during the closing operation, a gas circuit breaker that can drive the puffer piston at the time of opening the electrode effectively and reliably with a simple structure is provided. To provide.

A fourth object of the present invention is that, due to the action of the electromagnetic force of the coil and the biasing means incorporated between the puffer cylinder and puffer piston, it has a simple structure,
An object of the present invention is to provide a gas circuit breaker capable of expanding the puffer chamber when the circuit breaker is turned on and efficiently compressing the insulating gas in the puffer chamber when the circuit breaker is opened.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 is a pair of fixed electrodes arranged facing each other in a circuit breaker container containing an insulating gas having an arc extinguishing property. And a movable electrode portion, the movable electrode portion is provided with a movable arc contactor located at the center thereof and a movable current-carrying contact arranged concentrically outside the movable arc contactor, The fixed electrode portion is provided with a puffer cylinder fixed to the circuit breaker container and a fixed arc contactor located in the center thereof, and the fixed arc contactor is connected to the puffer cylinder via a rod. , The fixed electrode part is provided with a puffer piston slidably fitted in the inner circumference of the puffer cylinder, and the space inside the puffer cylinder on the movable electrode part side of the puffer cylinder is filled with insulating gas. A shrinking puffer chamber is formed.On the movable electrode side of the puffer cylinder, an insulating nozzle that blows the insulating gas compressed in the puffer chamber to the arc generated between the movable arc contact and the fixed arc contact, and the fixed arc. In a gas circuit breaker provided with a fixed energizing contact arranged concentrically outside the contact, a puffer cylinder and a puffer piston, and a puffer piston and a rod of a fixed arc contact are electrically connected to each other. ,
This puffer piston incorporates a piston side coil so that current flows in the rod path of the fixed side energizing contact, the puffer cylinder, the piston side coil, and the fixed arc contact, and the puffer cylinder is arranged in parallel with the piston side coil. Moreover, the cylinder side coil is installed so that the current flows through the rod path of the fixed side energizing contact, the puffer cylinder, the cylinder side coil, and the fixed arc contactor, and the windings of these piston side coil and cylinder side coil are in opposite directions. It is characterized by being wound around.

According to a second aspect of the present invention, in the gas circuit breaker according to the first aspect, between the rod of the fixed arc contactor and the puffer piston and on either one of them, a fixed energizing contactor and a movable energizing contactor are provided. And the fixed arc contactor and the movable arc contactor are in contact with each other, the rod of the fixed arc contactor and the puffer piston are locked to hold the puffer piston in the closed state of the circuit breaker. It is characterized in that a holding means for releasing the locking of the rod of the fixed arc contact and the puffer piston is provided.

According to a third aspect of the present invention, there is provided a pair of fixed electrode portion and movable electrode portion, which are arranged to face each other inside a breaker container containing an insulating gas having an arc extinguishing property, and the fixed electrode portion has a fixed electrode portion. Is provided with a fixed arc contact located at the center of the arc and a fixed energizing contact arranged concentrically outside the fixed arc contact, and the movable electrode part has a movable arc located at the center thereof. A contactor is provided, the movable arc contactor is connected to the drive means of the movable electrode portion via a rod, and the movable electrode portion further includes a puffer piston fixed to the breaker container and the puffer piston. There is provided a puffer cylinder that is slidably fitted to the outer periphery of the puffer and is electrically and mechanically connected to the rod of the movable arc contactor. The space on the part side forms a puffer chamber that compresses the insulating gas, and on the fixed electrode part side of the puffer cylinder, the insulating gas compressed in the puffer chamber is generated between the fixed arc contact and the movable arc contact. In a gas circuit breaker equipped with an insulating nozzle for blowing an arc and a movable energizing contact arranged concentrically outside the movable arc contactor, a puffer cylinder and a puffer piston, and a puffer piston and a movable arc contactor are provided. The rod and the rod are electrically connected to each other, and the puffer cylinder is incorporated in the puffer piston so that the current flows through the rod path of the movable energizing contact, puffer cylinder, piston side coil, and movable arc contactor. Is in parallel with the coil on the piston side and is a movable energizing contact, puffer cylinder, coil on the cylinder side. It incorporates cylinder coil to flow a current in the path of the rod of the movable arcing contact, characterized in that the windings of these piston-side coil and the cylinder-side coil is wound in the opposite direction.

According to a fourth aspect of the present invention, in the gas circuit breaker according to the first, second or third aspect, the puffer piston is provided in a space on the opposite side of the puffer chamber with the puffer piston in the puffer cylinder. Is provided to the insulating nozzle side.

The present invention according to claim 5 provides the gas circuit breaker according to claim 1, claim 2, claim 3 or claim 4,
The inductance value in the path of the puffer cylinder and the coil on the cylinder side in the closed state is characterized in being within the range of 50% to 200% of the inductance value in the path of the puffer cylinder and the coil on the piston side.

[0016]

In the gas circuit breaker according to claim 1 or 3, which has the above-mentioned structure, when the circuit breaker is turned on, a current flows through the coil on the cylinder side and the coil on the piston side. Occurs. Due to the action of this electromagnetic force, both coils have a force of attracting each other, and the attracting force drives the puffer piston in a direction of expanding the volume of the puffer chamber. At this time, since both coils are connected in parallel to the energizing contactor, the coil as a whole is in a low impedance state. On the other hand, during the opening operation of the circuit breaker, no current flows in the cylinder side coil and the piston side coil, so the electromagnetic force generated in both coils is lost, so that the attraction force between both coils is also lost. At this time, since there are two coils on the side of the current-carrying contact, the current-carrying contact side is in a high-impedance state compared to an arc contactor without a coil, and it is difficult for current to flow on the current-carrying contact side. Therefore, it is possible to easily commutate from the energizing contact to the arc contact.

Further, in the gas circuit breaker according to the second aspect of the invention, the fixed arc contact is brought into contact with the fixed energizing contact and the moving energizing contact, and the fixed arc contact and the moving arc contact are in contact with each other. The child rod and the puffer piston are locked by the holding means, and the state in which the puffer chamber volume is maximized is maintained. Further, when the arc is generated in the opening operation state of the circuit breaker, the locking of the rod of the fixed arc contact and the puffer piston is released.

In the gas circuit breaker according to the fourth aspect, the urging means, which has been energized by the holding means in the closed state of the circuit breaker, is deenergized by releasing the holding means during the opening operation of the circuit breaker. The puffer piston is urged toward the insulating nozzle by the releasing action. Therefore, the insulating gas in the puffer chamber, which has been kept at the maximum volume by the holding means when the circuit breaker is closed, is compressed by the puffer piston.

In the gas circuit breaker according to the fifth aspect, when the circuit breaker is closed, the inductance value in the path of the puffer cylinder and the coil on the cylinder side is 50% to 200% of the inductance value in the path of the puffer cylinder and the coil on the piston side. By setting it within the range of, the current can be simultaneously applied to both the puffer cylinder and the path of the coil on the cylinder side and the path of the puffer cylinder and the coil on the piston side. It is possible to generate an attractive force.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments corresponding to claims 1 to 5 according to the present invention will be specifically described below with reference to the accompanying drawings. 1 to 4, the same parts are designated by the same reference numerals.

(1) First Embodiment A first embodiment shown in FIGS. 1 and 2 has an electrode structure in a closed state of a gas circuit breaker corresponding to claims 1, 2 and 5 of the present invention. FIG. 2 is a sectional view showing the electrode structure in the opening operation.

As shown in the figure, a fixed electrode portion a is installed at one end of the circuit breaker, and a movable electrode portion b is arranged so as to face the fixed electrode portion a. The fixed electrode portion a and the movable electrode portion b are arranged coaxially, and the energizing contact 1
9 and the arc contactor 20 are installed.

The fixed electrode portion a has a puffer cylinder 11,
The puffer device for arranging the piston 12 and the rod 17 coaxially and compressing the insulating gas is configured. The puffer cylinder 11 and the rod 17 are integrated,
The piston 12 is a puffer cylinder 11 and a rod 17.
The puffer chamber 13 provided on the fixed electrode portion a side of the piston 12 is filled with an insulating gas. In this embodiment having such an arrangement, the fixed electrode portion a, the puffer cylinder 11, the piston 12, and the fixed electrode portion a and the rod 17 are electrically connected, but the piston 12 and the rod 17 are electrically insulated. To be done.
The fixed current contact 3 of the fixed electrode portion a is the puffer cylinder 1.
First, the fixed arc contactor 6 is installed at the tip of the rod 17. The fixed energization contact 3 and the fixed arc contact 6
The movable energizing contactor 4 and the movable arc contactor 7 are arranged facing each other. An insulating nozzle 21 is arranged in the puffer cylinder 11 on the installation side of the fixed electrode portion a and in the direction of the movable arc contactor 7.

The fixed electrode portion a of the puffer cylinder 11
Cylinder side coil 14 is provided on the side where
A cylinder side coil 14 and an oppositely wound piston side coil 15 are connected to the side of the piston 12 where the puffer chamber 13 is not formed. The cylinder side coil 14 and the piston side coil 15 correspond to the first and second coils of the present invention, and both coils are arranged in parallel with the rod 17 in the coaxial direction. Further, the inductance value in the path of the puffer cylinder and the coil on the cylinder side is set within the range of 50% to 200% of the inductance value in the path of the puffer cylinder and the coil on the piston side.

A spring 18 for urging the piston 12 is provided on the side of the piston 12 where the puffer chamber 13 is not formed. The spring 18 has one end fixed to the piston 12 and the other end fixed to the puffer cylinder 11. The spring 18 corresponds to the biasing device of the present invention. Further, a holding device 16 for the piston 12 is provided on the side of the rod 17 on which the fixed electrode portion a is not installed.

The operation of this embodiment having the above-mentioned structure is as follows according to the separating operation of the fixed electrode portion a and the movable electrode portion b.

That is, at the time of closing, as shown in FIG. 1, the fixed energizing contact 3 and the movable energizing contact 4,
The fixed arc contactor 6 and the movable arc contactor 7 are in contact with each other and are in an energized state, and the current flows through the energized contactor 19 side to the movable energized contactor 4 → fixed energized contactor 3 → puffer cylinder 11
→ It flows in the path of the cylinder side coil 14. At this time, the puffer cylinder 11 and the piston 12 are electrically connected,
Further, the inductance value in the path of the puffer cylinder and the coil on the cylinder side is 50% of the inductance value in the path of the puffer cylinder and the coil on the piston side.
Since it is within the range of 200%, the current also flows to the puffer cylinder 11 → the piston 12 → the piston side coil 15. Since the cylinder side coil 14 and the piston side coil 15 which are wound in the opposite direction and arranged in parallel are energized, they are attracted by an electromagnetic force so as to cancel each other's inductance, and the coil as a whole is in a low impedance state. Become. As a result, the piston 12 compresses the spring 18 to maximize the volume of insulating gas in the puffer chamber 13. When the volume of the puffer chamber 13 is maximized, that is, when the charging is completed, the holding device 16 is driven to anchor the piston 12 to the rod 17.

In the opening operation, the movable electrode portion b moves in the opening direction, and the fixed energizing contact 3 and the moving energizing contact 4 and the fixed arc contact 6 and the moving arc contact 7 make sliding contact. After this, first, the fixed energizing contact 3 and the movable energizing contact 4
Opens. As a result, the electric current flowing to the puffer cylinder 11 and the cylinder side coil 14 via the current-carrying contact 19 is in a state in which the fixed arc contact 6 and the movable arc contact 7 still have sliding contact portions, so that the arc The contact 20 side is commutated to the movable arc contact 7, the fixed arc contact 6, and the rod 17. Therefore, the cylinder side coil 14 and the piston side coil 15 which were in the energized state at the time of closing are
Since the current no longer flows through the puffer cylinder 11, the current does not flow. As a result, the electromagnetic force disappears and the force of attracting each other is also lost.

After this, as shown in FIG. 2, the fixed arc contact 6 and the movable arc contact 7 are completely separated. At this time, the fixed arc contact 6 and the movable arc contact 7
An arc A is generated between them to bridge between the two arc contacts. At this time, the holding device 16 is driven to release the moored state of the piston 12, and the piston 12 connected to the piston side coil 15 that has lost the force attracting the cylinder side coil 14 is urged by the spring 18 to move the puffer chamber. The high pressure gas in 13 is moved in the direction of compression. As a result, the insulating gas compressed by the puffer cylinder 11 and the piston 12 is blown to the arc A through the insulating nozzle 21, and then the arc A is cooled and extinguished, and the interruption of the current is completed. .

In this embodiment as described above, the cylinder-side coil 14 and the piston-side coil 15 are attracted by the electromagnetic force at the same time when they are brought into a low impedance state, and when they are cut off, they are brought into a high impedance state. Therefore, the potential difference generated between the fixed current-carrying contactor 3 and the movable current-carrying contactor 4 is alleviated, and the current is smoothly commutated from the current-carrying contactor 19 side to the arc contactor 20 side. The surface of the contactor will not be deformed or damaged. As described above, in the gas circuit breaker of the present embodiment, the gas circuit breaker having a good breaking performance capable of quickly and safely performing the duty operation of extinguishing the arc by preventing damage to the equipment and swiftly passing the current. Can be provided.

(2) Second Embodiment The second embodiment shown in FIG. 3 is the third and fourth aspects of the present invention.
FIG. 6 is a cross-sectional view showing an electrode structure of a gas circuit breaker in an open state corresponding to claim 5; Note that this embodiment has the same basic configuration, operation, and effect as the first embodiment, and the description of the same parts will be omitted.

As shown in FIG. 3, a movable electrode portion b is installed at one end of a circuit breaker container (not shown), and a fixed electrode portion a is arranged so as to face the movable electrode portion b. . Further, the puffer cylinder 11 and the rod 1 of the movable electrode portion b
7 is configured to be integrally driven in the same direction by an operating mechanism (not shown) having a driving force in the vertical direction in the figure. Therefore, the movable part and the fixed part at the time of opening the contacts are opposite to those in the first embodiment. Therefore, the movable energizing contactor 4 of the movable electrode portion b is attached to the puffer cylinder 11.
The movable arc contactor 7 is installed on the rod 17. Facing the movable energizing contact 4 and the movable arc contact 7,
The fixed energization contact 3 and the fixed arc contact 6 of the fixed electrode portion a are arranged. The puffer cylinder 11 is the first
Even without the holding device 16 provided in the embodiment, the open state is held against the force of the spring 18 by the operating mechanism.
Therefore, the holding device 16 is not installed in this embodiment.

A cylinder side coil 14 is provided on the side of the puffer cylinder 11 on which the movable electrode portion b is not installed, and a piston side coil 15 opposite to the cylinder side coil 14 is provided on the side of the piston 12 on which the puffer chamber 13 is not formed.
Are connected.

The operation of this embodiment having the above-mentioned structure is as follows according to the separating operation of the fixed electrode portion a and the movable electrode portion b. That is, during the closing operation, when the puffer cylinder 11 and the rod 7 are moved to the fixed electrode portion side by being driven by the operating mechanism and the energizing contact 19 and the arc contact 20 contact each other, the current is the same as in the first embodiment. The energizing contact 19 side is fixed energizing contact 3 → movable energizing contact 4 →
It flows through the path of the puffer cylinder 11 → cylinder side coil 14 and the fixed energizing contactor 3 → movable energizing contactor 4 → puffer cylinder 11 → piston 12 → piston side coil 15. At that time, since the piston side coil 15 and the cylinder side coil 14 which are wound in the opposite direction and arranged in parallel are both in the energized state, they are attracted by an electromagnetic force so as to cancel each other's inductance, and the piston 12 is moved to the spring 18. Drive in the direction of compression. As a result, due to the electromagnetic force of the coil and the driving force of the operating mechanism, the puffer chamber 13
The volume of the insulating gas is maximum.

In the opening operation, the movable electrode part b moves in the opening direction, and the fixed energizing contact 3 and the moving energizing contact 4 and the fixed arc contact 6 and the moving arc contact 7 make sliding contact. At this time, the puffer cylinder 11 and the rod 17 are integrally driven by the driving force of the operating mechanism. After this,
First, the fixed energizing contact 3 and the movable energizing contact 4 are separated.
As a result, the puffer cylinder 11 passes through the current contactor 19.
Since the fixed arc contact 6 and the movable arc contact 7 still have a sliding contact portion, the current flowing to the coil 14 on the cylinder side moves the arc contact 20 side to the fixed arc contact 6 → movable. The commutation from the arc contactor 7 to the rod 17 is made. Therefore, the piston-side coil 15 and the cylinder-side coil 14, which were in the energized state at the time of closing, no longer flow in the puffer cylinder 11, so that both of the currents are not conducted. As a result, the electromagnetic force disappears and the force of attracting each other is also lost. At this time, piston side coil 15
The piston 12 connected to the cylinder-side coil 14 that has lost the force of attracting to compresses the high pressure gas in the puffer chamber 13 by the biasing force of the spring 18 and the movement of the movable electrode portion b in the opening direction by the operating mechanism. Then, it is blown out from the insulating nozzle 21 to extinguish the arc. After that, the fixed arc contact 6 and the movable arc contact 7 are completely separated.

[0036]

As described above, according to the present invention, the cylinder side coil 14 and the piston side coil 15 are attracted by electromagnetic force at the same time when they are closed, and at the same time a low impedance state is obtained.
It becomes a high impedance state at the time of interruption operation. Therefore, the fixed current-carrying contactor 3 and the movable current-carrying contactor 4 during the opening operation.
The potential difference generated between them is relaxed, and the current is smoothly commutated from the side of the energizing contact 19 to the side of the arc contact 20. As a result, the surface of the energizing contact is deformed,
No damage such as breakage. As a result, according to the present invention, in particular, by preventing damage between the fixed energizing contact 3 and the movable energizing contact 4 and swiftly diverting the current, the duty operation of extinguishing arc can be performed quickly and safely. It is possible to provide a gas circuit breaker having a good breaking performance.

[Brief description of drawings]

FIG. 1 is a sectional view showing an electrode structure in a closed state of a gas circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an electrode structure of the gas circuit breaker according to the first embodiment of the present invention in an open state.

FIG. 3 is a sectional view showing an electrode structure of a gas circuit breaker according to a second embodiment of the present invention in an open state.

FIG. 4 is a sectional view of an electrode structure in a conventional gas circuit breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulating container 2 ... Upper conductor 3 ... Fixed energizing contactor 4 ... Movable energizing contactor 5 ... Contact spring 6 ... Fixed arc contactor 7 ... Movable arc contactor 8 ... Driving coil 9 ... Conductive piece 10 ... Mold part 11 ... Puffer cylinder 12 ... Piston 13 ... Puffer chamber 14 ... Cylinder side coil 15 ... Piston side coil 16 ... Holding device 17 ... Rod 18 ... Spring 19 ... Electrical contactor 20 ... Arc contactor 21 ... Insulation nozzle 22 ... Pressure vessel A ... Arc a ... Fixed electrode part b ... Movable electrode part

Claims (5)

[Claims] 1. A pair of fixed electrode portion and a movable electrode portion, which are arranged opposite to each other, are disposed inside a circuit breaker container containing an arc-extinguishing insulating gas, and the movable electrode portion has a central portion at its center portion. A movable arc contact located and a movable energization contact arranged concentrically outside the movable arc contact are provided, and the fixed electrode portion includes a puffer cylinder fixed to the circuit breaker container. , A fixed arc contactor located at the center of the puffer cylinder is connected to the puffer cylinder via a rod, and the fixed electrode part is connected to the inner circumference of the puffer cylinder. A puffer piston slidably fitted is provided, and a space inside the puffer cylinder on the side of the movable electrode portion of the puffer piston constitutes a puffer chamber for compressing the insulating gas, On the movable electrode portion side of the buffer buffer cylinder, an insulating nozzle for spraying the insulating gas compressed in the puffer chamber to the arc generated between the movable arc contactor and the fixed arc contactor, and to the outside of the fixed arc contactor. In a gas circuit breaker provided with a fixed current-carrying contact arranged on a concentric circle, the puffer cylinder and the puffer piston, and the puffer piston and a rod of the fixed arc contact are electrically connected to the puffer piston. Is a fixed side energizing contactor, a puffer cylinder, a piston side coil, a piston side coil is incorporated so that an electric current flows in the route of the rod of the fixed arc contactor, and the puffer cylinder is arranged in parallel with the piston side coil, and Fixed side energizing contact, puffer cylinder, cylinder side coil, fixed arc contact Path cylinder coil to flow a current built into the gas circuit breaker characterized in that the windings of these piston-side coil and the cylinder-side coil is wound in the opposite direction. 2. A fixed energizing contact and a movable energizing contact, and a fixed arc contact and a moving arc contact are respectively in contact with the rod of the fixed arc contactor and the puffer piston, and with one of them. When the circuit breaker is closed, the rod of the fixed arc contact and the puffer piston are locked to hold the puffer piston, and the rod of the fixed arc contact and the puffer piston are locked when the circuit breaker is opened. 2. The gas circuit breaker according to claim 1, further comprising holding means for releasing the gas breaker. 3. A pair of fixed electrode portions and a movable electrode portion, which are arranged so as to face each other, in a circuit breaker container containing an insulating gas having an arc extinguishing property, and the fixed electrode portion has a central portion at its center portion. A fixed arc contact located and a fixed current-carrying contact arranged concentrically outside the fixed arc contact are provided, and the movable electrode section is provided with a movable arc contact located at the center thereof. The movable arc contactor is connected to the drive means of the movable electrode portion via a rod, and the movable electrode portion further includes a puffer piston fixed to the circuit breaker container and an outer periphery of the puffer piston. A puffer cylinder slidably fitted to the movable arc contactor and electrically and mechanically connected to the rod of the movable arc contactor is provided. The space on the pole side constitutes a puffer chamber that compresses the insulating gas, and the fixed electrode portion side of the puffer cylinder is filled with the insulating gas compressed in the puffer chamber of the fixed arc contactor and the movable arc contactor. In a gas circuit breaker provided with an insulating nozzle for spraying an arc generated between the movable arc contactor and a movable energizing contact arranged concentrically outside the movable arc contactor, the puffer cylinder, the puffer piston, and the puffer piston And the rod of the moving arc contactor are electrically connected to each other, and the puffer piston has a coil on the piston side so that a current flows through the path of the moving energizing contact, the puffer cylinder, the piston side coil, and the rod of the moving arc contactor. Is incorporated in the puffer cylinder in parallel with the coil on the piston side, the movable energizing contact, and the puffer cylinder. The cylinder side coil is incorporated so as to allow a current to flow in the path of the cylinder, the cylinder side coil, and the rod of the movable arc contactor, and the piston side coil and the cylinder side coil are wound in opposite directions. A gas circuit breaker. 4. An urging means for urging the puffer piston toward the insulating nozzle is provided in a space in the puffer cylinder opposite to the puffer chamber across the puffer piston. The gas circuit breaker according to claim 1, claim 2 or claim 3. 5. In the closed state, the inductance value in the path of the puffer cylinder and the cylinder side coil is set to be within a range of 50% to 200% of the inductance value in the path of the puffer cylinder and the piston side coil. The gas circuit breaker according to claim 1, claim 2, claim 3 or claim 4, which is characterized.