JPH0745859Y2 - Gas switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a clapper-type gas switch such as a gas circuit breaker or a gas switch.

[Prior Art] Conventionally, this kind of gas switch has a structure as shown in FIG. 3, and an insulating gas such as SF ₆ gas is contained in an insulating container (1) made of epoxy resin or the like. Is enclosed, and the shut-off portions are housed in the three-phase side-by-side state.

The shut-off portion is composed of a fixed contactor (2) and a movable contactor (3) of a butt contact structure, and the fixed contactor (2) is provided on the upper side of the rear wall of the container (1). Circuit conductor (4)
The main circuit conductor (5) on the movable side, which is supported and connected to the movable contactor (3) and is penetrated through the lower part of the rear wall of the container (1).
To a flexible lead wire (6).

The movable contactor (3) of each phase is supported by the opening / closing operation shaft (7) penetrating the side wall of the container (1) via an insulating support piece (8), and both ends are locked to the support piece (8). The wipe spring (9) is installed in the U-shaped spring retainer (9), and the movable contact (3) is pressed from the back by this spring force.

A disk-shaped arc extinguishing device (11) for extinguishing the arc generated when the contacts (2) and (3) are separated by high-speed rotation is provided directly above the interruption part.

The arc extinguishing device (11) is constructed by integrally molding a drive coil and a permanent magnet, which are magnetic field generating devices, and an arc runner arranged on the lower surface, with an insulating material such as epoxy resin. (2) is also integrally molded, and the lower contact portion of the fixed contact (2) has an arc extinguishing device (1
It is arranged near the hollow part of 1) so as to face the hollow part.

One end of the drive coil is connected to the fixed contactor (2) and the other end is connected to the arc runner.

Then, in the above-mentioned configuration, the operation shaft (7) is rotated counterclockwise (blocking direction) in the drawing from the closed state of FIG. 3 to separate the movable contactor (3) from the fixed contactor (2). And let
The arc generated between the two contacts (2) and (3) shifts the arcing point of the movable contact (3) from the fixed contact (2) to the arc runner as the movable contact (3) rotates, and the arc is applied to the drive coil. An electric current is conducted.

Therefore, the magnetic field of the drive coil is generated between the movable contactor (3) and the arc runner together with the magnetic field of the permanent magnet, and the rotating force according to Fleming's left-hand rule acts on the arc, so that the arc is in an insulating gas atmosphere. At, the outer periphery of the hollow part of the arc runner is rotated at high speed to be rapidly cooled, and the arc is extinguished at the current zero point, and the interruption is completed.

[Problems to be solved by the device]

By the way, FIG. 4 shows the movement of the movable contactor (3) in the gas switch at the time of interruption.

When the shutoff command is issued, the operating shaft (7) is rapidly rotated by the spring force of the shutoff spring in the operating mechanism (not shown), and the movable contactor (3) is moved from the closing position to the shutoff position. The arc is extinguished as required.

However, the movable contactor (3) described above is heavy in itself,
Since a large inertial force is applied to the operating shaft (7) during the breaking operation, the operating mechanism connected to this still has a large inertial force even at the completion position of the breaking operation, and strongly hits the stopper of the mechanism to rebound. And the movable contactor (3) is largely repelled via the operation shaft (7).

Therefore, the movable contactor (3) is extinguished despite being extinguished once.
Due to the rebounding, the distance between the poles becomes short again and the flashover occurs again, and the arc time is extended.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to provide a gas switch which can suppress the rebound of the movable contactor during the breaking operation. To do.

[Means for Solving the Problems]

To achieve the above object, in the gas switch of the present invention, a fixed contactor connected to a fixed side main circuit conductor and a movable main circuit conductor supported by a rotatable operation shaft are provided with lead wires. A movable contactor which is connected via the movable contactor and whose front surface is in butt contact with the fixed contactor; and a U-shaped iron core which is disposed on the opposite side of the movable contactor from the fixed contactor and surrounds the lead wire, The movable contactor is provided with an iron piece which is provided integrally with the movable contactor and which is inserted between both ends of the U-shaped iron core at a position where the breaking operation is completed.

[Action]

In the gas switch having the above-described structure, when the movable contactor does not extinguish even when the movable contact reaches near the completion position of the breaking operation during the breaking operation, the magnetic flux due to the breaking current is induced in the U-shaped iron core. Therefore, when the iron piece integrated with the movable contact is inserted between both ends of the U-shaped iron core, the iron piece receives an attractive force by the magnetic field between them, and the movement of the iron piece is restrained, so that the rebound of the movable contact occurs. Suppressed.

〔Example〕

 One embodiment will be described with reference to FIGS. 1 and 2.

In FIG. 1, a point different from FIG. 3 is that a part of the lead wire (6) is enclosed at a position on the front surface of the movable-side main circuit conductor (5) in the insulating container (1) so as to be slightly closer to the front. A U-shaped iron core with the open end facing is arranged on the movable contact (3).
The U-shaped spring retainer (9) for holding the wipe spring (10) on the back side of the spring is constituted by an iron piece, that is, a magnetic material, and the rear portion of the spring retainer (9) is shown by the dashed line in FIG. This is a point inserted between both ends of the U-shaped core (12) as shown in FIG.

Therefore, in the case of this embodiment, when the movable contactor (3) does not extinguish even after reaching the completion position of the breaking operation during the breaking operation, the breaking current (arc current) flowing through the lead wire (6) causes U The magnetic flux Φ as shown in FIG. 2 continues to be induced in the V-shaped iron core (12), and the spring retainer fitting (9) is inserted into the magnetic field between the both ends, so that the spring retainer fitting (9) is The movable contactor (3) is restrained in its movement by receiving the attractive force of this magnetic field.

As a result, the movable contactor (3) is restrained from moving at the completion position of the breaking operation, and even if the operating mechanism hits the stopper and rebounds, it is very small. The arc is extinguished reliably by the arc extinguishing device (11) that is held at the completed position.

It should be noted that when the current is cut off during no-load operation or at the beginning of the breaking operation process, the above-mentioned suction effect cannot be obtained.
There is no inconvenience.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

The gas switch of the present invention is provided with a U-shaped iron core surrounding the lead wire connecting the movable side main circuit conductor and the movable contactor on the side opposite to the fixed contactor of the movable contactor. Since an iron piece that is inserted between both ends of the U-shaped iron core at the completion position of the shutoff operation is provided on the back surface,
The movement of the iron piece, that is, the movable contactor at the completion position of the breaking operation is restricted by the attractive force due to the magnetic field induced between both ends of the V-shaped iron core, and the rebound of the movable contact piece at the completion position of the breaking operation is suppressed. Therefore, it is possible to solve the problems such as the reflash and the extension of the arc time, and it is possible to improve the breaking performance.

[Brief description of drawings]

1 and 2 show one embodiment of a gas switch according to the present invention, FIG. 1 is a cutaway side view, FIG. 2 is a front view of a U-shaped iron core, and FIGS. FIG. 3 is a cut side view, and FIG. 4 is an operation explanatory view of the movable contactor during the breaking operation. (2) …… Fixed contact, (3) …… Movable contact, (4)
…… Fixed side main circuit conductor, (5) …… Movable side main circuit conductor,
(6) ... Lead wire, (7) ... Opening / closing operation axis, (9) ...
… Spring retainer, (12) …… U-shaped iron core.

Claims (1)

[Scope of utility model registration request] 1. A fixed contactor connected to a fixed-side main circuit conductor, a fixed contactor supported by a rotatable operation shaft and connected to a movable-side main circuit conductor through a lead wire, and a front surface of the fixed contactor. A movable contactor in butt contact, a U-shaped iron core arranged on the opposite side of the movable contactor from the fixed contactor and surrounding the lead wire, and integrally with the movable contactor on the back surface of the movable contactor. A gas switch provided with an iron piece that is provided between both ends of the U-shaped iron core at a position where the shutoff operation is completed.