JPH08190843A - Gas circuit breaker - Google Patents

Abstract

PURPOSE: To reduce the diameter of insulation cylinders and miniaturize a gas circuit breaker by improving the supporting structure of a tulip contact. CONSTITUTION: In a gas circuit breaker which has a main fixed contact 11 with tulip contact, a main movable contact 15, a fixed arc contact 8, a movable arc contact 17 and an insulation nozzle 5 stored in insulation cylinders 3, 4 in such a manner that the main fixed contact is arranged on the outer periphery of the insulation nozzle, the insulation nozzle is fixed with an annular fixture 6. A supporting portion 20 formed on the outer periphery of the fixture supports the inside face of the tulip contact of the main fixed contact. A supporting bracket which was provided between the main fixed contact and the insulation cylinder hitherto can be eliminated and so the insulation cylinder can be arranged directly outside the main fixed contact. In this way, the diameter of the insulation cylinder can be reduced and the gas circuit breaker can be miniaturized.

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 used in a gas insulated switchgear or the like.

[0002]

2. Description of the Related Art A conventional gas circuit breaker will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing a cutoff portion of a magnetic papule type gas circuit breaker combined with magnetic drive. Further, in the figure, the left side of the center line shows a state where the gas circuit breaker is turned on, and the right side shows a state where the gas circuit breaker is turned off.

The gas circuit breaker comprises an upper terminal 1, a lower terminal 2,
The insulating cylinders 3 and 4 form a gas circuit breaker container. The insulating nozzle 5 is attached to the mounting base 1 of the upper terminal 1 by the fixing bracket 6.
It is fixed at 9. A thermal papper chamber 7 is formed by the upper terminal 1 and the insulating nozzle 5. A fixed arc contact 8, an arc runner 9, and a coil 10 for magnetic drive are arranged inside the thermal papper chamber 7.

The main fixed contact 11 forms a tulip contact, the upper end of which is engaged with the groove 13 provided on the outer periphery of the mounting base 19 of the upper terminal 1 and is mounted by winding the spring 12 on the outside. Main fixed contact 11
A contact pressure directed inward is applied to the lower end of the spring 14 by the spring 14. The lower end of the fixed contact 11 is supported by a support fitting 22 formed on the lower terminal 2, and the inside of the contact surface of the tulip contactor is supported at a position slightly smaller than the outer diameter of the main movable contact 15 described later.

A main movable contact 15 and a movable arc contact 17 which are in sliding contact with the lower terminal 2 are provided. A contact pressure is applied to the movable arc contact 17 by a spring 21 to bring the fixed arc contact 8 and its tip into contact with each other. When the main movable contact 15 comes into contact with the main fixed contact 11, the main movable contact 15 moves upward from the right half state in the drawing. When the tip of the main movable contact 15 comes into contact with the inner surface of the lower end of the main fixed contact 11, the tulip contact moves further upward while spreading the lower end of the contact.

In the closed state of the gas circuit breaker, as shown in the left half of the figure, the outer peripheral surface of the main movable contact 15 and the inner surface of the tulip contact of the main fixed contact 11 come into contact with each other,
The contact pressure is applied by the spring 14.

[0007]

In the conventional gas circuit breaker described above, it is necessary to provide the support fitting 22 for supporting the tulip contact of the main fixed contact 11, and the support fitting 22 is the main fixed contact. It had to be installed outside 11. For this reason, the diameter of the insulating cylinder becomes large, and the outer shape of the gas circuit breaker becomes large.

An object of the present invention is to reduce the diameter of the gas circuit breaker and the size of the gas circuit breaker by improving the support structure of the tulip contactor.

[0009]

In order to achieve the above object, the present invention provides a main fixed contact consisting of a tulip contact, a main movable contact, a fixed arc contact, and a movable arc contact inside an insulating cylinder. In a gas circuit breaker that houses an insulating nozzle, a fixed arc contact is arranged inside the insulating nozzle, and a main fixed contact consisting of tulip contacts surrounds the outer circumference of the insulating nozzle, the insulating nozzle has an annular fixing bracket. Is fixed to the mounting base, and the main fixed contact is attached to the mounting base at the outer portion of the fixing metal fitting, and the fixing metal fitting supports the inner surface of the tulip contact of the main fixing contact by the outer peripheral portion thereof.

[0010]

[Operation] Since the inner surface of the tulip contactor of the main fixed contact is supported by the outer peripheral portion of the fixing metal fitting arranged inside the main fixed contact, a supporting metal fitting or the like is provided between the main fixed contact and the insulating cylinder. Eliminates the need to place As a result, the diameter of the insulating cylinder can be reduced and the gas circuit breaker can be downsized.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example in which the present invention is applied to a thermal drive type gas circuit breaker with magnetic drive. Also, in the figure, the left side of the center line shows the state in which the gas circuit breaker is turned on,
The right side shows the cutoff state.

The gas circuit breaker comprises an upper terminal 1, a lower terminal 2,
The insulating cylinders 3 and 4 form a gas circuit breaker container. An insulating gas such as SF ₆ gas is enclosed in this container.
A mounting base portion 19 is formed below the upper terminal 1, and the insulating nozzle 5 is fixed to the mounting base portion 19 by a fixing bracket 6. A thermal papper chamber 7 is formed by the upper terminal 1 and the insulating nozzle 5. An opening 18 is formed at the center of the insulating nozzle 5. In addition, a support portion 20 that projects outward is formed on the outer peripheral portion of the fixture 6.

A fixed arc contact 8, an arc runner 9 and a magnetic drive coil 1 are provided inside the thermal papper chamber 7.
0 is placed. The arc runner 9 is connected to the upper terminal 1 and the fixed arc contact 8 via the coil 10. The main fixed contact 11 is arranged so as to surround the fixing metal piece 6 of the insulating nozzle 5.

The main fixed contact 11 forms a tulip contact, the upper end of which is engaged with the groove 13 provided on the outer periphery of the mounting base 19 of the upper terminal 1 and is attached by winding the spring 12 on the outside. This spring 12
Applies the contact pressure of the main fixed contact 11 to the upper terminal 1. A contact pressure directed inward is applied to the lower end of the main fixed contact 11 by the spring 14. The intermediate portion of the fixed contact 11 is supported by the support portion 20 of the fixing fitting 6.

A main movable contact 15 is provided which is in sliding contact with the lower terminal 2. This main movable contact 1
The lower part of 5 is connected to the operating rod 16. The operating rod 16 is vertically driven by an operating device (not shown). A movable arc contact 17 is attached to the main movable contact 15 so as to come into contact with the main movable contact 15 while sliding. The movable arc contact 17 is biased upward by the spring 21, that is, toward the fixed arc contact 8.

The operation of the gas circuit breaker configured as described above will be described. The right half of the figure shows a state in which the gas circuit breaker is cut off, in which the main fixed contact 11 and the main movable contact 15 are separated, and the fixed arc contact 8 and the movable arc contact 17 are also separated. From this state, when the operating rod 16 is driven upward by the operation of the operating device (not shown), the movable arc contact 17 enters the thermal papper chamber 7 through the opening 18 of the insulating nozzle 5 and comes into contact with the fixed arc contact 8. To do. Further, the main movable contact 15 is driven upward and comes into contact with the main fixed contact 11. During this time, the spring 21 is compressed.

After the tip of the main movable contact 15 is engaged with the tip of the main fixed contact 11, the main movable contact 15 moves further upward and overcomes the force of the spring 14 to push the main contact 11 outward. The main fixed contact 11 is separated from the supporting portion 20 of the fixing fitting 6, and the contact pressure of the spring 14 is applied to the main movable contact 15. The state where the gas circuit breaker is turned on as described above is shown in the left half of the figure. In this state, a current flows through the path of the upper terminal 1-main fixed contact 11-main movable contact 15-lower terminal 2.

When shutting off the gas circuit breaker, the operating rod 16 is driven downward from the state on the left side of the drawing. First, the main movable contact 15 is separated from the main fixed contact 11. The lower end side of the main fixed contact 11 of the tulip contact moves toward the inside because it comes off the main movable contact 15. When the intermediate portion hits the outer periphery of the fixing member 6 of the insulating nozzle 5, it is supported by the fixing member 6 and does not move any further.

When the main movable contact 15 is separated from the main fixed contact 11, the fixed arc contact 8 and the movable arc contact 17 are in contact with each other. Therefore, the energized current is commutated to the fixed and movable arc contacts 8 and 17, and no arc is generated between the main movable contact 15 and the main fixed contact 11. When the operation rod 16 is further moved downward, the movable arc contact 17 is moved to the main fixed contact 15
The movable arc contact 17 separates from the fixed arc contact 8 by moving downward together therewith, and an arc is generated between the two contacts. This arc moves from the fixed arc contact 8 to the arc runner 9 when the movable arc contact 17 moves further downward, and an arc is generated between the arc runner 9 and the movable arc contact 17.

When the arc moves to the arc runner 9, a current flows through the coil 10 to generate a magnetic flux. This magnetic flux links with the arc and drives the arc to rotate. The arc rotates around the axis of the gas circuit breaker. During this time, the arc is relatively blown to the insulating gas in the hot papper chamber 7, and the arc extinguishing action by magnetic drive is performed. At the same time, the arc heats the insulating gas in the hot pappa chamber 7 to increase the pressure in the hot pappa chamber 7.

Further, the movable arc contact 17 is moved downward, and its tip is removed from the opening 18 of the insulating nozzle 5. Then, the insulating gas heated to a high pressure by the arc in the hot papper chamber 7 is discharged into the gas circuit breaker container at a high speed from the gap between the opening 18 and the movable arc contact 17. This high-pressure gas blows on the arc to extinguish it.

As described above, according to this embodiment,
The insulating cylinder 3 can be arranged just outside the main fixed contact 11. That is, it is not necessary to provide the support fitting 22 between the main fixed contact 11 and the insulating tube 3 as in the conventional case. Therefore, the diameter of the insulating cylinder 3 can be made smaller than that of the conventional one, and the diameter of the entire gas circuit breaker can be made smaller and smaller.

In the above description, an example in which the present invention is applied to a thermal drive type gas circuit breaker combined with magnetic drive has been described. However, the present invention is not limited to this, and a thermal papper type gas circuit breaker or It is also applicable to other gas circuit breakers using insulating nozzles.

[0024]

According to the present invention, the diameter of the gas circuit breaker can be reduced and the shape of the gas circuit breaker can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of a gas circuit breaker of the present invention.

FIG. 2 is a side sectional view of a conventional gas circuit breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper terminal 2 ... Lower terminal 3,4 ... Insulation cylinder 5 ... Insulation nozzle 6 ... Fixing metal fitting 7 ... Thermal papper chamber 8 ... Fixed arc contact 9 ... Arc runner 10 ... Coil 11 ... Main fixed contact 12, 14 ... Spring 13 ... Groove 15 ... Main movable contact 16 ... Operating rod 17 ... Movable arc contact 18 ... Opening 19 ... Mounting base 20 ... Supporting portion 21 ... Spring

Claims (1)

[Claims] 1. A main fixed contact consisting of a tulip contact, a main movable contact, a fixed arc contact, a movable arc contact and an insulating nozzle are housed inside an insulating cylinder, and the fixed arc contact is the insulating nozzle. In a gas circuit breaker arranged inside, wherein a main fixed contact composed of the tulip contact is arranged so as to surround the outer periphery of the insulating nozzle, the insulating nozzle is fixed to a mounting base by an annular fixing metal fitting, and the main fixing is performed. A gas circuit breaker, wherein a contact is attached to the mounting base at an outer portion of the fixing metal fitting, and the fixing metal fitting supports an inner surface of a tulip contact of the main fixed contact by an outer peripheral portion thereof.