JPH0575931U - Gas switch - Google Patents

Abstract

(57) [Summary] [Purpose] To quickly move the arc to the arc runner to shorten the arc time and stabilize the arc extinguishing performance. [Structure] The fixed contact 12 is formed on the lower end of the fixed conductor 11, and the fixed contact 12 is formed on the upper end of the movable conductor 15.
A movable contactor 16 which is brought into contact with and separated from the contactor 12 is formed.
In the gas switch in which the arc generated when the switch 6 is opened is arc-extinguished by an annular arc extinguishing device 19 composed of a drive coil 21 and an arc runner 22 arranged above the arc, a part of the movable conductor 15 is Both contacts 12 at the time of opening,
The parallel part 17 is substantially parallel to the arc between the parts 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an arc rotary type gas switch.

[0002]

[Prior Art]

Conventionally, this kind of gas switch is configured as shown in FIG. 2, for example. That is, a fixed conductor 1 is provided in the vertical direction in a circuit breaker arc extinguishing chamber in which an insulating gas such as SF ₆ gas is filled, and a fixed contact 2 is formed at the lower end of the conductor 1, while not shown in the figure. A movable conductor 3 in the up-and-down direction connected to a main shaft in the front-rear direction and rotated by the main shaft is provided, and a movable contactor 4 for contacting with and separating from the fixed contactor 2 is formed at an upper end portion of the conductor 3.

Further, an annular arc extinguishing device 5 is arranged above the contacts 2 and 4. The arc-extinguishing device 5 comprises a support conductor plate 6 supported and connected to the fixed conductor 1, a drive coil 7 and an arc runner 8 located below the drive coil 7. Both ends of the drive coil 7 are the support conductor plate 6 and the arc runner 8, respectively. It is connected to the.

In the gas switch, when the movable conductor 3 is rotated counterclockwise from the closed state to separate the movable contactor 4 from the fixed contactor 2, an arc is formed between the contactors 2 and 4. The arc is generated, and this arc moves upward due to the levitation force of the arc itself and the loop electromagnetic force due to the current flowing through the movable conductor 3, and eventually the arc foot moves from the fixed contactor 2 to the arc runner 8.

Therefore, by moving the arc between the arc runner 8 and the movable contactor 4, an arc current is introduced to the drive coil 7, the coil 7 is excited, and the magnetic field generated by the coil 7 moves with the arc runner 8. Electromagnetic force, that is, a rotating force according to Fleming's left-hand rule, acts on the arc generated between the contactors 4 during this period, and the arc rotates at a high speed around the lower end of the hollow portion of the arc runner 8 in an insulating gas atmosphere. It is rapidly cooled and extinguished.

[0006]

[Problems to be solved by the device]

 However, in the above-mentioned conventional structure, the loop electromagnetic force acting on the arc at the time of breaking depends on the magnetic field due to the current flowing through the movable conductor 3, but this arc is generated in the movable contactor 4 at the tip of the linear movable conductor 3. As a result, the magnetic field does not act sufficiently and the loop electromagnetic force is insufficient. Therefore, the arc transition to the arc runner 8 is unstable, the arc time varies, and the arc extinguishing performance is unstable. There is a problem.

The present invention has been made in view of such problems of the conventional technique, and an object of the present invention is to quickly transfer an arc generated at the time of opening and closing to an arc runner. It is to provide a gas switch that can.

[0008]

[Means for Solving the Problems]

 To achieve the above object, in the gas switch of the present invention, a fixed contact is formed at the lower end of the fixed conductor, and a movable contact is formed at the upper end of the movable conductor so as to contact and separate from the fixed contact. However, an annular arc extinguishing device consisting of a magnetic field generator and an arc runner for rotating and extinguishing the arc generated when the contacts are opened is placed above the contacts and when a part of the movable conductor is opened. The parallel part is almost parallel to the arc between both contacts.

[0009]

[Action]

 According to the above-mentioned configuration, at the time of opening, a current in the direction opposite to the arc current flows in the parallel part of the movable conductor that is almost parallel to the arc generated between the movable contact and the fixed contact. The electromagnetic repulsive force acts upward on the arc under the influence of the magnetic field due to, and the arc moves upward due to this electromagnetic repulsive force together with the levitation force of the arc itself, and quickly moves to the arc runner.

[0010]

EXAMPLE An example will be described with reference to FIG. A vertical fixed conductor 11 is provided in a circuit breaker arc extinguishing chamber in which an insulating gas such as SF ₆ gas is filled, and a fixed contact 12 is formed at the lower end of the conductor 11 and at the lower end of the fixed conductor 11. The stepped extending portion 13 is integrally provided, and the main fixed contactor 14 is formed under the stepped extending portion 13.

On the other hand, a movable contactor 16 for contacting with and separating from the fixed contactor 12 is formed at the upper end portion of a vertically movable conductor 15 supported by a main shaft in the front-rear direction (not shown) via an insulator. A parallel portion 17 is formed in the middle part of the movable conductor 15 so as to be substantially parallel to the arc generated between the contacts 12 and 16 by stepwise bending to the fixed conductor 11 side, and the parallel portion 17 of the movable conductor 15 is fixed. A main movable contactor 18 that comes into contact with and separates from the main fixed contactor 14 is integrally provided near the end on the conductor 11 side.

Further, an annular arc extinguishing device 19 is arranged above both the contacts 12 and 16 so that the center of the hollow portion thereof coincides with the final stop position of the movable contact 16. The arc extinguishing device 19 comprises a support conductor plate 20, a drive coil 21 and an arc runner 22 which are supported and connected to a fixed conductor 11, and both ends of the drive coil 21 are connected to the support conductor plate 20 and the arc runner 22, respectively. There is.

Here, the fixed contact 12 has a spring follow-up structure, and during the closing operation, the movable contact 16 first contacts the fixed contact 12 by the clockwise rotation of the movable conductor 15, and When 15 further rotates, the contact surface of the fixed contact 12 contracts, and then the main movable contact 18 contacts the main fixed contact 14. On the contrary, at the time of the breaking operation, the main movable contact 18 is first separated from the main fixed contact 14 by the counterclockwise rotation of the movable conductor 15, and the movable conductor 15 is further rotated to contact the fixed contact 12. The surface extends, and then the movable contact 16 is separated from the fixed contact 12.

In such a configuration, when the movable contact 16 is separated from the fixed contact 12 after the main movable contact 16 is separated from the main fixed contact 14 at the time of disconnection, both contacts 12, An arc is generated between the parallel conductors 16. At this time, a current flows in the parallel portion 17 of the movable conductor 15 in a direction substantially parallel to the arc and in the opposite direction. The arc is pushed up to the side of the arc runner 22, and the levitation force of the arc itself helps, and the arc quickly moves to the arc runner 22, and the arc is extinguished by rotation.

In particular, in the above-described embodiment, both of the above-mentioned contacts 12 and 16 are used as so-called arc contacts, and the main fixed contact 14 of the fixed conductor 11 and the parallel portion 17 of the movable conductor 15 are closer to the base side, that is, the external terminal side. Since the main movable contact 18 of the above is used as an energization path at the time of closing, almost no short-circuit current flows in the parallel portion 17 when a short-circuit current flows during closing, and there is no adverse effect on the energizing performance due to excessive electromagnetic repulsion. Becomes

[0016]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. A part of the movable conductor with a movable contact at the upper end is a parallel part that is almost parallel to the arc generated between the fixed contact and the movable contact at the time of opening, and electromagnetic repulsion due to the current flowing through the parallel part Since the arc is pushed upward by the force to the arc extinguishing device side, the arc is transferred to the arc runner reliably and promptly, and the arc is extinguished in a rotating manner. The effect that stabilization can be achieved is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a gas switch according to the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 11 fixed conductor 12 fixed contactor 15 movable conductor 16 movable contactor 17 parallel part 19 arc extinguishing device 21 drive coil 22 arcrunner

Claims (1)

[Scope of utility model registration request] 1. A fixed contact is formed at a lower end of a fixed conductor, and a movable contact is formed at an upper end of a movable conductor so as to come into contact with and separate from the fixed contact, which occurs when the two contacts are separated. In a gas switch for arc extinguishing by means of an annular arc extinguishing device composed of a magnetic field generator and an arc runner arranged above the both contacts, a part of the movable conductor, A gas switch with a parallel part that is almost parallel to the arc between both contacts.