JP2000030577A - Rotary arc type gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker preventing the deformation and breakage of an arc-extinguishing chamber, capable of reliably extinguishing an arc and excellent in current carrying reliability. SOLUTION: This circuit breaker is provided with a fixed electrode 1 fixed in a sealed container, a fixed arc contact piece 3 provided on the fixed electrode 1, a short-circuit ring 7 supported on the fixed electrode 1 via a first insulator 8, an arc runner 9 provided on the inner periphery section of the short-circuit ring 7, an arc drive coil 10 wound on the outer periphery section of the short- circuit ring 7 via a second insulator 11, a moving electrode 4 supported contactably/separably to/from the fixed arc contact piece 3, and a moving arc contact piece 5 provided at the tip section of the moving electrode 4. A cylindrical reinforcing tube 12 is provided on the outer periphery section of the second insulator 11, and a magnetic material is preferably used for the material of the reinforcing tube 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed electrode in which a movable electrode and a fixed electrode are disposed in a container, and a short-circuit ring having an arc runner on the inner periphery and an arc driving coil on the outer periphery is arranged around the fixed electrode. The present invention relates to a rotary arc type gas circuit breaker supported via an insulating material.

[0002]

2. Description of the Related Art Conventionally, there are roughly two types of rotary arc type gas circuit breakers which extinguish an arc in a stationary gas atmosphere. FIG. 6 shows a first conventional example. FIG. 6 is a side sectional view showing an open state of a conventional rotary arc type gas circuit breaker. In the figure, reference numeral 1 denotes a fixed electrode, on which a fixed arc contact 3 is attached via a spring 2. Reference numeral 6 denotes an annular auxiliary electrode which covers the fixed arc contact 3 and is electrically connected to the fixed electrode 1 and attached thereto. 4 is a movable electrode,
A movable arc contact 5 is provided at the tip. Reference numeral 7 denotes a short-circuit ring made of a conductive material, which is disposed on the fixed electrode 1 via a first insulator 8. Reference numeral 9 denotes an arc runner provided on the inner periphery of the short-circuit ring 7 and protrudes toward a contact portion between the fixed arc contact 3 and the movable arc contact 5. Reference numeral 10 denotes an arc drive coil wound around the outer circumference of the short-circuit ring 7, one end of which is electrically connected to the arc runner 9 via the short-circuit ring 7, and the other end of which is electrically connected to the fixed electrode 1. The arc drive coil 10 is held and insulated by the second insulator 11. Reference numeral 15 denotes an arc between the arc runner 9 and the auxiliary electrode 6, and reference numeral 16 denotes an arc between the movable arc contact 5 of the movable electrode 4 and the arc runner 9. The fixed electrode 1, the movable electrode 4, and the short-circuit ring 7 are housed in a sealed container (not shown) together with the arc-extinguishing gas. The rotating arc type gas circuit breaker of the first conventional example operates as follows. When the movable electrode 4 is driven downward (on the side opposite to the fixed electrode), the movable electrode 4 is separated from the fixed arc contact 3 of the fixed electrode 1 and the movable arc contact 5 and the fixed arc contact 3 of the movable electrode 4 are separated. An arc occurs between them. Further, when the movable electrode 4 is driven downward, the arc generated between the movable arc contact 5 of the movable electrode 4 and the fixed arc contact 3 moves onto the arc runner 9. When the arc moves to the arc runner 9, an arc 16 is generated between the movable arc contact 5 of the movable electrode 4 and the arc runner 9, and the arc runner 9 and the auxiliary electrode 6 are moved.
An arc 15 is generated between them. At this time, the arc current flows from the movable arc contact 5 of the movable electrode 4 through the arc 16 in the arc-extinguishing gas atmosphere to the fixed electrode 1 through the arc drive coil 10 through the arc driving coil 10 and to the arc current from the arc runner 9. The current flows from the auxiliary electrode 6 to the fixed electrode 1 via the arc 15 in the arc gas atmosphere. A magnetic flux is generated in the arc drive coil 10 by an arc current flowing through the arc drive coil 10. This arc drive coil 1
The magnetic flux generated in 0 extinguishes the arc 16 between the movable arc contact 5 and the arc runner 9 and the arc 15 between the arc runner 9 and the auxiliary electrode 6 by rotating in an arc-extinguishing gas. FIG. 7 shows a second conventional example. FIG.
7A is a sectional side view showing an open state of the rotary arc type gas circuit breaker, and FIG. 7B is a sectional view taken along the line BB 'of FIG. The difference from the first conventional example is that the movable energizing contact 18 and the fixed energizing contact 17 are provided and that the shape of the second insulator 11 is changed. The movable energizing contact 18 is provided at a distance from the tip of the movable electrode 4,
When the circuit is closed, it comes into contact with the fixed energizing contact 17 to energize. The second insulator 11 is an insulating resin whose outer peripheral portion is formed in a gear shape, covers the arc drive coil 10, and fixes the arc drive coil 10 to the short-circuit ring 7. The fixed energizing contact 17 includes a spring 19
The central portion is supported by a gear-shaped recess of the second insulator 11. Second
The conventional rotary arc type gas circuit breaker of the invention operates as follows. When the movable electrode 4 is driven downward by an operating mechanism (not shown) from a closed state (not shown) in which the movable energizing contact 18 contacts the fixed energizing contact 17 and the movable arc contact 5 comes into contact with the fixed arc contact 3, the movable movable contact 18 moves first. The energizing contact 18 dissociates from the fixed energizing contact 17. At this time, since the movable arc contact 5 and the fixed arc contact 3 are in contact with each other, no arc is generated between the current-carrying contacts. When the movable electrode 4 further moves downward, the movable arc contact 5 is separated from the fixed arc contact 3 of the fixed electrode 1, and an arc is generated between the movable arc contact 5 and the fixed arc contact 3.
Further, when the movable electrode 4 moves downward, the arc generated between the movable arc contact 5 and the fixed arc contact 3 moves to the auxiliary electrode 6 and the arc runner 9. Finally, the arc is split into an arc 16 between the arc runner 9 and the movable arc contact 5 and an arc 15 between the auxiliary electrode 6 and the arc runner 9. The arc current at this time flows from the movable arc contact 5 of the movable electrode 4 to the arc runner 9 via the arc 16 in the arc-extinguishing gas atmosphere, and from the arc runner 9 to the fixed electrode 1 via the short-circuit ring 7 and the arc drive coil 10. The fixed electrode 1 flows from the auxiliary electrode 6 through the arc runner 9 through the arc 15 in the arc-extinguishing gas atmosphere.
It will flow to. That is, the arc current flows in parallel to the arc driving coil 10 and the arc 15. Therefore, the magnetic flux Φ2 is generated by the arc current flowing through the arc driving coil 10. An arc extinguishing gas in which an arc 16 between the movable arc contact 5 and the arc runner 10 and an arc 15 between the arc runner 10 and the auxiliary electrode 7 are sealed in a sealed container by the magnetic flux generated in the arc driving coil 10. The arc is extinguished by rotating inside. FIG.
As shown in (b), the fall of the fixed energizing contact caused by the electromagnetic force or the mechanical contact at the time of closing and closing is prevented by a gear-shaped support provided on the outer peripheral portion of the insulating resin 12.

[0003]

However, the conventional rotary arc type gas circuit breaker has the following problems. In the first conventional example, when an arc is generated, a time-varying coil current flows through the arc driving coil, and a magnetic flux is generated. Since this magnetic flux also changes with time, an eddy current is generated in the short-circuit ring by electromagnetic induction. Depending on the current phase, the eddy current and the coil current flow in opposite directions, and an electromagnetic repulsion is generated between the short-circuit ring and the arc driving coil. Further, a force spreading in the outer peripheral direction acts on the arc driving coil due to the loop electromagnetic force of the arc driving coil itself in addition to the electromagnetic repulsion force. Therefore, when an excessive coil current flows, the arc drive coil spreads outward, and the insulator holding the arc drive coil is broken and scattered, causing a short circuit and disconnection of the arc drive coil. There was a risk of destruction. In addition, in the second conventional example, in addition to the above-mentioned problems, the fixed energizing contact moves in the circumferential direction by the electromagnetic force at the time of closing and closing, so that the gear-shaped fixed energizing contact provided on the outer peripheral portion of the insulating resin. The supporting portion of the child is broken and scattered, and the scattered pieces cause an electric field concentration between the contacts, thereby making it impossible to cut off. Further, the fixed energizing contact may fall down due to the destruction of the support portion of the fixed energizing contact, and the contact pressure between the energizing contacts may not be maintained, resulting in an energizing arc and damage to the sealed container. SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary arc type gas circuit breaker in which the arc can be reliably extinguished without deformation and destruction of the arc-extinguishing chamber, and which has excellent energization reliability.

[0004]

In order to solve the above problems, the present invention has the following arrangement. As a first invention, a fixed electrode (1) fixed inside a sealed container,
A fixed arc contact (3) provided on the fixed electrode (1); a short-circuit ring (7) supported on the fixed electrode (1) via a first insulator (8); ), And a second insulator (1) on the outer circumference of the short-circuit ring (7).
An arc drive coil (10) wound through 1) and a movable electrode (4) supported so as to be able to contact and separate from the fixed arc contact (3).
And a movable arc contactor (5) provided at the tip of the movable electrode (4), wherein a cylindrical reinforcement is provided on the outer peripheral portion of the second insulator (11). A tube (12) is provided. As a second invention, a fixed electrode (1) fixed inside a sealed container, a fixed arc contact (3) provided on the fixed electrode (1), and a first electrode fixed to the fixed electrode (1). A short-circuit ring (7) having a cylindrical shape supported by an insulator (8) and having an inclined surface having a small diameter at a central portion in the axial direction and increasing in diameter from the central portion toward both ends; ring
The arc runner (9) provided on the inner periphery of (7) and the short-circuit ring
(7) an arc drive coil (10) wound around a second insulator (11) along the outer periphery of the fixed arc contact;
(3) A rotary arc type gas circuit breaker comprising: a movable electrode (4) supported so as to be able to come and go with the movable electrode (4); and a movable arc contactor (5) provided at the tip of the movable electrode (4). 2 insulator
On the outer periphery of (11), a cylindrical reinforcing cylinder (12) having at least one projection (12a) on the inner periphery is provided. As a third invention, a spacer (13) is provided instead of the projection (12a). As a fourth invention, a fixed electrode (1) fixed inside a sealed container, a fixed arc contact (3) provided on the fixed electrode (1), and a first electrode fixed to the fixed electrode (1). Insulator
A short-circuiting ring (7) supported via (8), an arc runner (9) provided on an inner peripheral portion of the short-circuiting ring (7), and an outer peripheral portion provided along an outer peripheral portion of the short-circuiting ring (7). Formed in a gear shape
Arc drive coil (10) wound around the insulator (11)
A fixed current-carrying contact (17) supported by a gear-shaped recess outside the second insulator (11) and electrically connected to the fixed electrode (1); A movable electrode (4) supported so as to be able to contact and separate from 3), a movable arc contact (5) provided at the tip of the movable electrode (4), and a movable electrode (4) provided at a distance from the tip of the movable electrode (4). In a rotary arc type gas circuit breaker provided with a movable electric contact (18), the second insulator (11)
The outer peripheral portion formed into a gear shape is a metal reinforcing cylinder (12). As a fifth invention, the reinforcing cylinder (12) is made of a magnetic material. As a sixth invention, stoppers (14) extending to the inner diameter side are provided at both ends of the reinforcing cylinder (12).

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. (First Embodiment) FIG. 1 is a side sectional view of a rotary arc type gas circuit breaker for extinguishing an arc in a stationary gas atmosphere according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a fixed electrode fixed inside a sealed container (not shown).
, A fixed arc contact 3 is attached via a spring 2.
Reference numeral 4 denotes a movable electrode supported inside the container so as to be able to contact and separate from the fixed electrode 1, and a movable arc contact 5 is provided at the tip. Reference numeral 6 denotes an auxiliary electrode for covering the fixed arc contact 3, which is electrically connected to the fixed electrode 1. Reference numeral 7 denotes a short-circuit ring, which is attached to the fixed electrode 1 via a first insulator 8. Reference numeral 9 denotes an arc runner attached to the inner peripheral portion of the short-circuit ring 7. An arc drive coil 10 is wound around the outer peripheral surface of the short-circuit ring 7, one end is electrically connected to the arc runner 9 via the short-circuit ring 7, and the other end is electrically connected to the fixed electrode 1. Reference numeral 11 denotes a second insulator, which covers the arc driving coil 10 with an insulating resin and fixes the arc driving coil 10 to the short-circuit ring 7. Reference numeral 12 denotes a reinforcing cylinder which is attached so as to cover the outer peripheral portion of the second insulator 11. The fixed electrode 1, the movable electrode 4 and the short-circuit ring 7 thus configured are housed in a container (not shown) together with the arc-extinguishing gas. Next, the operation will be described. When the movable electrode 4 is driven downward (opposite to the fixed electrode side) by an operation mechanism (not shown) from a closed state (not shown) in which the movable arc contact 5 contacts the fixed arc contact 3,
The movable arc contact 5 of the movable electrode 4 is separated from the fixed arc contact 3 of the fixed electrode 1, and an arc is generated between the movable arc contact 5 and the fixed arc contact 3. Further, when the movable electrode 4 is operated downward, the arc generated between the movable arc contact 5 and the fixed arc contact 3 is transferred to the arc runner 9. When the arc moves to the arc runner 9, the arc is split into an arc 15 between the auxiliary electrode 6 and the arc runner 9 and an arc 16 between the arc runner 9 and the movable arc contact 5, as shown in FIG. You. At this time, the arc current flows from the movable arc contact 5 of the movable electrode 4 to the arc runner 9 through the arc 16 in the arc-extinguishing gas atmosphere, and the arc drive coil 1
0 and the auxiliary electrode 6 through the arc 15 in the arc-extinguishing gas atmosphere from the arc runner 9 to the auxiliary electrode 6.
It flows to the fixed electrode 1 more. Therefore, the magnetic flux Φ1 is generated by the arc current flowing through the arc driving coil 10.
Occurs. Since this arc current changes with time,
The value of the magnetic flux Φ1 also changes with time and is short-circuited by the electromagnetic induction.
An eddy current is generated. Therefore, depending on the current phase, an electromagnetic repulsive force acts between the arc drive coil 10 and the short-circuit ring 7, and a force that is pushed outward in the arc drive coil 10 acts. In addition to the above-described electromagnetic repulsion, a force that spreads in the outer peripheral direction acts on the arc drive coil 10 due to the loop electromagnetic force of the coil itself. Therefore, the provision of the reinforcing cylinder 12 prevents breakage and scattering of the insulating resin 11, prevents short-circuit and disconnection of the arc drive coil 10, and secures stable breaking performance. (Second Embodiment) FIG. 2 is a side sectional view of a rotary arc type gas circuit breaker for extinguishing an arc in a stationary gas atmosphere according to a second embodiment of the present invention. The short-circuit ring 7 has an inclined surface having a small diameter at a central portion and gradually increasing in diameter from the central portion toward both ends in the axial direction. It is attached to. The arcrunner 9 is attached to the inner periphery of the short-circuit ring 7. The arc drive coil 10 is wound around the outer peripheral surface of the short-circuit ring 7, one end is electrically connected to the arc runner 9 via the short-circuit ring 7, and the other end is electrically connected to the fixed electrode 1. . The second insulator 11 covers the arc driving coil 10 and fixes the arc driving coil 10 to the short-circuit ring 7. The reinforcing cylinder 12 has a cylindrical shape having at least one protrusion (12a) on the inner peripheral portion, and is attached so as to cover the outer peripheral portion of the second insulator 11. Other configurations are the same as those of the first embodiment. In this embodiment, the arc drive coil 10
There is a portion where the winding diameter is small, and when a magnetic flux is generated, the magnetic flux density is high in the portion where the winding diameter is small. For this reason, the electromagnetic repulsive force against the arc driving coil 10 and the force spreading outward of the arc driving coil 10 increase. Therefore, by providing at least one projection 12a on the inner peripheral portion of the reinforcing cylinder 12, it is possible to suppress the spread of the central portion of the coil having a large electromagnetic force particularly in the outer peripheral direction, and prevent the arc-extinguishing chamber from being broken. (Third Embodiment) FIG. 3 is a side sectional view of a rotary arc type gas circuit breaker for extinguishing an arc in a stationary gas atmosphere according to a third embodiment of the present invention.
The cylindrical reinforcing cylinder 12 is a spacer having a shape along the outer periphery of the cylinder.
Is held by Other configurations are the same as those of the second embodiment. Therefore, when an electromagnetic force acts on the arc drive coil 10, the spread of the portion where the winding diameter of the coil having a large electromagnetic force is small, particularly in the outer peripheral direction, is suppressed, and the destruction of the arc-extinguishing chamber can be prevented. Further, at the time of manufacturing, after the spacer 13 is divided into two or more parts and attached to the second insulator 11 and then the reinforcing cylinder 12 is attached, parts for holding the spacer 13 can be omitted. (Fourth Embodiment) FIG. 4 is a side sectional view showing a rotary arc type gas circuit breaker for extinguishing an arc in a stationary gas atmosphere according to a fourth embodiment of the present invention. It is attached to both ends of the cylinder 12. Therefore, when an electromagnetic force acts on the arc drive coil 10, the second insulator 11 whose radial deformation is suppressed by the reinforcing cylinder 12 can be prevented from protruding from both ends of the reinforcing cylinder 12, and the arc extinguishing chamber Destruction can be prevented. (Fifth Embodiment) FIGS. 5A and 5B show a rotary arc type gas circuit breaker for extinguishing an arc in a stationary gas atmosphere according to a fifth embodiment of the present invention, wherein FIG. 5A is a side sectional view, and FIG. It is sectional drawing in the AA 'line of a). The reinforcing cylinder 12 is formed by forming the outer peripheral portion of a second insulator 11 having a gear-like outer peripheral portion made of a conventional insulating resin,
It is molded in place of iron, a magnetic material. With such a configuration, when an arc is generated, the arc driving coil 1
The magnetic flux Φ1 is generated by the arc current flowing to zero. Since this arc current changes with time, the value of the magnetic flux Φ1 also changes with time, and an eddy current is generated in the short-circuit ring 7 by electromagnetic induction. Therefore, depending on the current phase, an electromagnetic repulsion acts between the arc drive coil 10 and the short-circuit ring 7. Further, in addition to the above-mentioned electromagnetic repulsion force, a force spreading in the outer peripheral direction acts on the arc drive coil 10 due to the loop electromagnetic force of the coil itself. The provision of the reinforcing cylinder 12 prevents breakage and scattering of the second insulator 11 due to electromagnetic force, prevents short-circuit and disconnection of the arc drive coil 10, and secures stable breaking performance. Further, since the outer periphery of the reinforcing cylinder 12 is formed in a gear shape, the strength of the reinforcing cylinder 12 can be improved, and the arc-extinguishing chamber can be applied to a larger electromagnetic force than when there is no gear portion. Can be prevented from being destroyed.
Further, as shown in FIG. 5B, the fixed energizing contact 17 is supported by a gear-shaped recess formed in the outer peripheral portion of the reinforcing cylinder 12. As a result, the fixed energizing contact 17 due to electromagnetic force and mechanical contact at the time of closing and closing
Can be prevented, the arc can be surely extinguished, an appropriate contact pressure of the fixed energizing contact 17 can be ensured, and high energizing performance can be ensured. In addition, since the reinforcement of the second insulator 11 and the support of the fixed energizing contact 17 are simultaneously performed by the reinforcing cylinder 12, the installation space can be reduced and the manufacturing can be simplified. Further, since the reinforcing cylinder 12 is made of a magnetic material, a magnetic field generated by an eddy current generated in a loop formed by the fixed energizing contact 17 and the spring 19, or a magnetic field generated by a current flowing through the circuit breaker to the upper or lower terminal, or Since the magnetic field from the outside of the circuit breaker can be shielded, and the disturbance of the magnetic field by the arc driving coil 10 as the arc driving source can be suppressed, a stable breaking performance can be secured. Further, since the magnetic flux generated by the arc driving coil 10 passes through a magnetic material having a small magnetic resistance, the orthogonality of the magnetic flux with the arc 15 and the arc 16 can be improved in the arc generating region, and the rotational driving force of the arc increases. And
The breaking performance can be improved. As described above, since the magnetic material is used as the material of the reinforcing cylinder, the external magnetic field can be shielded, and the orthogonality of the magnetic flux and the arc generated by the drive coil can be improved, and the breaking performance can be improved. . In this embodiment, the material of the reinforcing cylinder 12 is iron. However, the material is not limited to this, and a magnetic material of another material may be used.

[0006]

As described above, according to the present invention, the following effects can be obtained. (1) Since the reinforcing cylinder is provided on the outer peripheral portion of the insulating material, the spread of the arc driving coil due to the electromagnetic force is suppressed, the destruction and scattering of the insulating material holding the arc driving coil are prevented, and the arc driving coil is short-circuited. There is no disconnection or the like, and the arc can be reliably extinguished. (2) Since stoppers are provided at both ends of the reinforcing cylinder, the insulating material is prevented from protruding from both ends of the reinforcing cylinder, and the insulating material is damaged.
There is no scattering, and the arc can be extinguished reliably. (3) Since the gear-shaped outer peripheral portion of the second insulator 11 is formed of a metal material as a reinforcing cylinder, arc extinction is surely prevented by preventing the fixed energizing contact from falling down due to electromagnetic force and mechanical contact. At the same time, it is possible to secure an appropriate contact pressure of the contact, and to ensure high energization performance. (4) Since a magnetic material is used for the reinforcing cylinder, an external magnetic field can be shielded, and the orthogonality of the magnetic flux and the arc generated by the drive coil can be improved, and the breaking performance can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an open state of a rotary arc type gas circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a side sectional view showing an open state of a rotary arc type gas circuit breaker according to a second embodiment of the present invention.

FIG. 3 is a side sectional view showing an open state of a rotary arc type gas circuit breaker according to a third embodiment of the present invention.

FIG. 4 is a side sectional view showing an open state of a rotary arc type gas circuit breaker according to a fourth embodiment of the present invention.

FIGS. 5A and 5B show the open state of a rotary arc type gas circuit breaker according to a fifth embodiment of the present invention, wherein FIG.
(B) is a sectional view taken along line AA 'of (a).

FIG. 6 is a side sectional view showing an open state of a conventional rotary arc type gas circuit breaker.

7A and 7B are diagrams showing an open state of a conventional rotary arc type gas circuit breaker, where FIG. 7A is a side sectional view, and FIG. 7B is a sectional view taken along the line BB ′ of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed electrode 2, 19 Spring 3 Fixed arc contact 4 Movable electrode 5 Movable arc contact 6 Auxiliary electrode 7 Shorting ring 8 First insulator 9 Arcrunner 10 Arc drive coil 11 Second insulator 12 Reinforcement cylinder 13 Spacer 14 Stopper 15, 16 Arc 17 Fixed energizing contact 18 Movable energizing contact

Claims (6)

[Claims] 1. A fixed electrode fixed inside a sealed container.
(1) and a fixed arc contact provided on the fixed electrode (1)
(3), a short-circuit ring (7) supported on the fixed electrode (1) via a first insulator (8), and an arc runner (9) provided on an inner peripheral portion of the short-circuit ring (7). , A second around the outer periphery of the short-circuit ring (7).
Arc drive coil (10) wound around the insulator (11)
A rotating electrode comprising a movable electrode (4) supported so as to be able to contact and separate from the fixed arc contact (3), and a movable arc contact (5) provided at the tip of the movable electrode (4). In the gas circuit breaker, a rotary arc type gas circuit breaker characterized in that a cylindrical reinforcing tube (12) is provided on an outer peripheral portion of the second insulator (11). 2. A fixed electrode fixed inside a sealed container.
(1) and a fixed arc contact provided on the fixed electrode (1)
(3) and a cylindrical shape supported on the fixed electrode (1) via the first insulator (8), the diameter of the central portion in the axial direction is small, and the diameter increases from the central portion toward both ends. A short-circuit ring (7) having an inclined surface, an arc runner (9) provided on an inner peripheral portion of the short-circuit ring (7), and a second insulator ( 11) an arc driving coil (10) wound therethrough, a movable electrode (4) supported so as to be able to contact and separate from the fixed arc contact (3), and a movable electrode (4) provided at the tip of the movable electrode (4). A rotary arc type gas circuit breaker having a movable arc contact (5), a cylindrical shape having at least one protrusion (12a) on an inner peripheral portion of an outer peripheral portion of the second insulator (11). A rotary arc type gas circuit breaker characterized by comprising a reinforcing cylinder (12). 3. A rotary arc type gas circuit breaker according to claim 2, wherein a spacer (13) is provided instead of said projection (12a). 4. A fixed electrode fixed inside a sealed container.
(1) and a fixed arc contact provided on the fixed electrode (1)
(3), a short-circuit ring (7) supported on the fixed electrode (1) via a first insulator (8), and an arc runner (9) provided on an inner peripheral portion of the short-circuit ring (7). A second insulator (11) provided along the outer peripheral portion of the short-circuit ring (7), the outer periphery being formed in a gear shape;
And a fixed current-carrying contact supported by a gear-shaped recess outside the second insulator (11) and electrically connected to the fixed electrode (1). Child (17)
A movable electrode (4) supported so as to be able to contact and separate from the fixed arc contact (3); a movable arc contact (5) provided at the tip of the movable electrode (4); and a movable electrode (4). A rotary arc type gas circuit breaker provided with a movable energizing contact (18) provided at a distance from the tip of (2), wherein the outer peripheral portion of the second insulator (11) formed in a gear shape is a metal reinforcing cylinder. (12) A rotary arc type gas circuit breaker according to (12). 5. A rotary arc type gas circuit breaker according to claim 1, wherein said reinforcing cylinder is made of a magnetic material. 6. A stopper according to claim 1, wherein stoppers (14) extending radially inward are provided at both ends of said reinforcing cylinder (12).
The rotary arc type gas circuit breaker according to any one of claims 1 to 7.