JPH05266758A - Disconnector - Google Patents

Abstract

PURPOSE:To provide a small-sized disconnector with the operating physical force of a movable contact lessened, by making structure unnecessary to provide a negative pressure chamber for sucking arcs by improving the arc-extinguishing property. CONSTITUTION:An arc contact 4 is made movable in the direction of a movable contact 8 to allow abutting against a contact provided on a fixed electrode. Moreover the parallel gap part 10 of an insulator is provided near a contact 12, and a conductor 13, connecting the contact 12 to a fixed electrode 2 in a nearly orthogonal direction to a shaft of the arc contact 4 is provided. Then the arc contact 4 and the contact 12 are separated from each other at the time of separation, and arcs generated there are led to the parallel gap. Thereby the arc-extinguishing property is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disconnector, for example, a busbar switching disconnector used in a gas insulated switchgear.

[0002]

2. Description of the Related Art FIG. 4 is a cross-sectional view of a conventional disconnector shown in, for example, the Electrical Review May 1984 issue, in which 1 is a ground tank as a container, 2 is a fixed electrode, and 3 is a fixed electrode. Cylindrical finger-shaped fixed contacts attached to
Is a columnar arc contact mounted coaxially with the fixed contactor 3, 5 is a movable electrode, and 8 is a movable contact having a hollow portion 40, which is arranged coaxially with the fixed contactor 3 and It is attached to the movable electrode 5 so as to be movable in the direction, that is, in the horizontal direction in the drawing. 9 is an opening at the tip of the movable contact 8, 25 is a piston attached to the movable contact 8, 6 is a cylinder attached to the movable electrode 5, 7 is a negative pressure chamber composed of the cylinder 6 and the piston 25, 8a Is the hollow portion 40 of the movable contact 8 and the negative pressure chamber 7.
A communication hole communicating with and 27 is an operation rod. Here, the movable contact 8 and the fixed contact 3 constitute a main contact.

Next, the operation will be described. At the time of opening,
An operation device (not shown) moves the operation rod 27 to the left side in the figure with force F to move the operation rod 27, the piston 25,
The movable contact 8 is moved in conjunction to expand the volume of the negative pressure chamber 7, and the pressure P ₁ of the negative pressure chamber 7 is ΔP (ΔP = P ₀ −P ₁ ) higher than the gas pressure P ₀ in the ground tank 1. Lower. This gas pressure difference ΔP forms a suction flow of the insulating gas in the opening 9 at the tip of the movable contact 8, and the arc generated between the arc contact 4 and the movable contact 8 at the time of opening the electrode.
This gas flow is blown into 30 to effectively shut off.

As described above, in the structure in which the gas pressure in the negative pressure chamber 7 is made to be a negative pressure by ΔP compared to the surroundings, Δ in the direction opposite to the driving force F.
Since a force of P · S (S: negative pressure chamber cross-sectional area) acts, in order to move the movable contact 8, a force that moves the movable contact 8 at a predetermined speed against frictional force and the negative pressure chamber 7 The sum of the forces due to the negative pressure of is required.

[0005]

Since the conventional disconnecting switch is constructed as described above, it requires an operating device having a large driving force for the movable contact due to the force due to the gas pressure in the negative pressure chamber, and the driving device is driven. Since the force is large, the driving force transmission part becomes large,
As a result, there was a problem that the size of the entire device was increased. In addition, there are problems such as generation of foreign matter due to arc and ground fault due to transfer of arc to ground tank.

The present invention has been made in order to solve the above-mentioned problems, and the movable contact can be driven with a small force to reduce the size of the movable contact. The purpose is to obtain a highly reliable disconnecting switch by suppressing the transition to.

[0007]

In the disconnector according to the present invention, a columnar arc contact is movable in the direction of the movable contact, and a contact which can contact the arc contact is provided on the fixed electrode. Further, a parallel gap portion made of an insulator having a large number of grooves parallel to the circumferential direction of the inner surface of the cylinder is provided near the contact. Then, during the opening operation, with the movable contact and the arc contact in contact with each other, the arc contact and the contact are separated from each other, and the arc generated at this time is introduced into the groove of the parallel gap portion. It was done.

[0008]

According to the present invention, the current is interrupted between the contactor and the arc contact during the opening operation, and the arc at the time of interruption is introduced into the parallel gap of the parallel gap portion by the force of the action of the current and the magnetic flux. By doing so, the current is cut off promptly.

[0009]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 to 3 and 5 are the same as the conventional device. In the figure, 8 is a columnar movable contact, 4 is a columnar arc contact that can move coaxially with the movable contact 8, and 15 is provided on the outer periphery of the arc contact 4 so as to push the arc contact 4 toward the movable electrode 5. With the push spring, the arc contact 4 and the push spring
15 is attached to the fixed electrode 2 via an insulator 14.
Reference numeral 12 denotes a contactor that is provided coaxially with the arc contact 4 and can come into contact therewith. Reference numeral 10 denotes a plurality of contact points near the contactor 12, outside the arc contact 4, and in parallel with the cylindrical inner surface in the circumferential direction. Attached to the fixed electrode 2 is a parallel gap made of a grooved insulator. Reference numeral 13 is a conductor that connects the contact 12 and the fixed electrode 2 in a direction substantially perpendicular to the axis of the arc contact 4.

FIG. 1 shows a state in which the movable contact 8 is moved to the right side in the drawing by an operating device (not shown) when the disconnecting switch is closed, but first, the arc contact 4 is first contacted. , The push spring 15 is further compressed while moving to the right. After that, the arc contact 4 and the contact 12 are brought into pressure contact with each other, and an electric path connecting the movable electrode 5 to the movable contact 8, the arc contact 4, the contact 12, the conductor 13, and the fixed electrode 2 is formed. Further, the movable contact 8 moves to the right and the movable contact 8 and the fixed contact 3 come into contact with each other to form the closed state of the main contact. When the contact is opened, the operation reverse to the above operation is performed. That is, the movable contact is moved to the left side in the drawing from the closed state. First, the main contact composed of the movable contact 8 and the fixed contact 3 is separated. here,
The arc contact 4 moves leftward while being pressed against the movable contact 8 by the spring force of the pressing spring 15. At this time, the current flowing through the main contact is fixed electrode 2 conductor 13 contactor 12
Commutation occurs in a circuit composed of the arc contact 4 to the movable contact 8 to the movable electrode 5. After this, when the movable contact 8 further moves to the left, the arc contact 4 and the contact 12
The contact composed of is opened. At this time, an arc is generated because the current is cut off between the arc contact 4 and the contact 12. The behavior of this arc will be described with reference to FIG. Figure 2
In, the current flowing through the conductor 13 and the current flowing through the arc are formed substantially at right angles, and the electromagnetic force F causes the arc to move downward in the drawing and be pushed into a large number of narrow parallel gaps in the parallel gap portion 10. The arc thus generated is divided into a large number of short arcs, the apparent arc resistance increases as compared with a single arc, the arc cannot be maintained, and the arc extinguishes naturally when the current zero point is reached. After that, the arc contact 4 and the movable contact 8 are separated to complete the disconnection. Of course, no arc occurs at this time. As described above, since the arc is generated inside the parallel gap portion 10, the generated foreign matter is less scattered and the influence on the other is reduced, and the possibility of a ground fault due to the transfer of the arc to the grounded tank is reduced.

Embodiment 2. FIG. 3 shows another embodiment. Figure 3
FIG. 2 is an enlarged view of the vicinity of the contact 12 of FIG. In the embodiment shown in FIG. 1, the electromagnetic force considering the current path is used to guide the arc generated between the contact 12 and the arc contact 4 to the parallel gap of the parallel gap portion 10. An arc drive coil 16 may be installed in the vicinity of the contact 12 as shown in, and the arc may be extinguished quickly by moving the arc with a magnetic field.

[0012]

As described above, according to the present invention, the contacts and the arc contacts are separated at the time of separation, and the generated arc is quickly guided to the plurality of parallel gaps in the parallel gap portion. Since it is configured to extinguish the arc, the force due to the gas pressure of the negative pressure chamber for gas suction is not required, and the driving force of the operating device can be small, and a small disconnector can be obtained. In addition, since an arc is generated inside the parallel gap, the scattering of foreign matter is reduced, and the risk of ground fault due to the transfer of the arc to the grounded tank is reduced, and the overall effect of highly reliable equipment is obtained. is there.

[Brief description of drawings]

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

FIG. 2 is an enlarged view of the vicinity of the parallel gap portion of the disconnector of FIG.

FIG. 3 is an enlarged view near a parallel gap portion of a disconnector according to another embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional disconnector.

[Explanation of symbols]

 1 Ground Tank 2 Fixed Electrode 3 Fixed Contact 4 Arc Contact 5 Movable Electrode 8 Movable Contact 10 Parallel Gap 12 Contactor 13 Conductor 16 Arc Drive Coil 15 Push Spring

Claims (1)

[Claims] 1. A disconnector including a fixed electrode and a movable electrode having a columnar movable contact movable in the direction of the fixed electrode in a grounded container having an insulating gas sealed therein. And a columnar arc contact that is axially movable to the movable electrode side by a spring coaxially with the contact, a contact that can come into contact with the arc contact coaxially with the arc contact, and the arc near the contact. The fixed electrode is provided with a parallel gap portion of an insulator having a large number of grooves parallel to the circumferential direction of the inner surface of the cylinder at the position outside the contact, and the movable contact contacts the arc contact when closed. When the contact is made, the arc contact comes in contact with the contact, and when the contact is opened, the movable contact, the arc contact and the contact are separated from each other, and the movable contact is placed at an intermediate position between the open contact and the closed contact. Tact and arc contacts contact each other, disconnectors, characterized in that the arc contact which is adapted so as to separable and the contactor, introducing arc generated here into the groove of the parallel gap.