HK1130941B - Vacuum switchgear - Google Patents

Description

Vacuum switch mechanism

Technical Field

The present invention relates to a vacuum switchgear, and more particularly, to a vacuum switchgear including a plurality of interrupters stored in a vacuum container and suitable for use as a power receiving and distributing apparatus of a power system.

Background

A switching mechanism is provided as an element of a power receiving and distributing apparatus in a power distribution system in a power system. Conventionally, an air-insulated structure has been used in many cases as such a switching mechanism, but a gas-insulated structure using SF6 gas as an insulating medium has been used to achieve miniaturization. However, if SF6 is used as the insulating medium, there is a concern that it may adversely affect the environment, and therefore, a vacuum insulation system using vacuum insulation as the insulating medium has been proposed in recent years.

As such a switching mechanism of the vacuum insulation system, there is a structure in which a double-break interrupter is configured by including two fixed contacts and a movable contact thereof, which are respectively stored in a vacuum container (see, for example, patent document 1: japanese patent application laid-open No. 2007-14087).

In the vacuum insulated switchgear including the double break interrupter, in order to ensure the current carrying performance of the contact in the vacuum atmosphere in the vacuum container, it is necessary to obtain a contact force determined by the short-circuit current value at the time of an accident from the elastic force of the pressure contact spring provided on the operator side. In addition, in response to this, it is necessary to set the operating force of the operator to a value that is against the elastic force of the pressure contact spring.

In the vacuum insulation type switching mechanism including the double break interrupter, an electromagnetic repulsive force in a direction to open the contacts is generated in the connection conductor connecting the two pairs of movable contacts stored in the vacuum vessel. The electromagnetic repulsive force acts on the operator side from the connection conductor through the crimp spring.

Thus, since a contact force against the electromagnetic repulsive force is given between the contacts, it is necessary to increase the elastic force of the pressure contact spring. Thus, if the elastic force of the pressure contact spring is increased, the size of the operator for storing the pressure contact spring is increased, which causes a problem of cost increase.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum switch mechanism capable of reducing an electromagnetic repulsive force generated in a connection conductor connecting two movable contacts arranged side by side and suppressing an increase in size of a pressure contact spring.

In order to achieve the above object, the present invention according to one aspect is a vacuum switch mechanism including an interrupter including two fixed contacts stored in a vacuum container and two movable contacts that are brought into contact with and separated from the fixed contacts, wherein a connection conductor having a collector that is brought into sliding electrical contact with outer peripheral surfaces of one operating lever and the other operating lever is fixed to a lead-out portion of the vacuum container of an operating lever connected to each of the movable contacts.

In the second invention, in addition to the first invention, the connection conductor is fixed to the lead-out portion of the vacuum vessel by soldering.

In the third invention, in addition to the first invention, the connection conductor is fixed to a mold portion between the vacuum vessels of the operation rod lead-out portion by a fixing member such as a screw.

In the fourth aspect of the invention, in addition to any one of the first to third aspects of the invention, the one operation rod and the other operation rod are connected to the operating device through a conductive connecting member and an insulator.

In the fifth invention, in addition to any one of the first to third inventions, the one operation lever and the other operation lever are connected to the operator through a non-conductive connecting member.

In the sixth invention, in addition to any one of the first to fifth inventions, the one fixed contact and the movable contact and the other fixed contact and the movable contact are stored in a common vacuum vessel provided with an insulating tube.

In the seventh invention, in addition to any one of the first to fifth inventions, the one fixed contact and the movable contact and the other fixed contact and the movable contact are respectively stored in a vacuum container provided with an insulating tube.

The effects of the present invention will be explained.

The invention can reduce the electromagnetic repulsion generated on the connecting conductor of two pairs of movable contacts of the double-break interrupter and restrain the enlargement of the pressure contact spring, so the enlargement of the operator can be restrained and the cost can be reduced.

Drawings

Fig. 1 is a longitudinal sectional front view showing one embodiment of a vacuum switch mechanism of the present invention.

Fig. 2 is a longitudinal sectional front view showing another embodiment of the vacuum switch mechanism of the present invention.

Fig. 3 is a longitudinal sectional front view showing still another embodiment of the vacuum switch mechanism of the present invention.

Fig. 4 is a longitudinal sectional front view showing another embodiment of the vacuum switch mechanism of the present invention.

In the figure:

1-interrupter, 2-insulating cylinder, 3-vacuum container, 4-fixed contact, 5-movable contact,

6-molding, 7-operating rod, 8-metal bellows, 9-link, 10-insulator,

11-operating rod, 12-crimping spring, 13-operator, 14-current collector, 15-connecting conductor.

Detailed Description

Hereinafter, embodiments of the vacuum switchgear according to the present invention will be described with reference to the drawings.

Fig. 1 is a longitudinal sectional front view showing one embodiment of a vacuum switch mechanism of the present invention. In fig. 1, an interrupter 1 constituting a vacuum switching mechanism is of a vacuum double-break three-position type in this example. The interrupter 1 includes: a vacuum container 3 having an insulating cylinder 2; two fixed contacts 4 respectively stored in the vacuum container 3; the movable contact 5, which is brought into contact with and separated from each fixed contact 4, is of a double-break type.

The vacuum vessel 3 provided with the insulating tube 2 is configured by one vacuum vessel storing two fixed contacts 4 and two movable contacts 5 in this example. The vicinity including the two fixed contacts 4 and the two movable contacts 5 is covered with an arc shield 2 a. The outer peripheral surface of the vacuum container 3 provided with the insulating tube 2 is molded by a molding portion 6 of epoxy resin or the like. The outer surface of the molded part is grounded by the conductive paint applied, ensuring safety of contact.

One fixed contact 4 on the left side of fig. 1 in the vacuum chamber 3 is connected to a bus bar by a feeder, and the other fixed contact 4 on the right side of fig. 1 is connected to a cable distribution box by a feeder.

Conductive operation levers 7 are connected to the one movable contact 5 and the other movable contact 5 that are in contact with and separated from the one and the other fixed contacts 4, respectively. The operation rod 7 is led out of the vacuum chamber 3 through a metal bellows 8. The end of the operating rod 7 that is drawn out of the vacuum chamber 3 is connected by an insulating connecting body 9. An operating rod 11 having an insulator 10 is connected to the connecting body 9. The operating lever 11 is connected to an operator 13 via a pressure contact spring 12.

A connection conductor 15 having a collector 14 in sliding electrical contact with the outer peripheral surfaces of the first and second operation levers 7 and 7 is fixed to the vacuum chamber 3 by brazing or the like at the lead-out portion of the operation lever 7 of the vacuum chamber 3.

The one movable contact 5 and the other movable contact 5 are stopped by the operating lever 11 at three positions, namely, a closed position Y1 for conducting electricity, an open position Y2 for interrupting current, and a disconnecting position Y3 for ensuring safety of an inspection worker against a surge voltage of thunder or the like.

Next, the operation of one embodiment of the vacuum switch mechanism of the present invention will be described.

The movable contact 5 of the interrupter 1 is switchable by operation of the operating device 13 to three positions, i.e., a closed position Y1 for conducting electricity, an open position Y2 for interrupting current, and a disconnecting position Y3 for securing safety of an inspection worker against a surge voltage of thunder or the like.

In the interrupter 1, the energizing current flows through the connecting conductor 15 via the collector 14 in a state where the movable contact 5 is at the closed position Y1 for energizing by the operation of the operator 13, that is, in a state where the movable contact 5 is in contact with the fixed contact 4, but since the connecting conductor 15 is fixed to the vacuum vessel 3, the electromagnetic repulsive force generated in the connecting conductor 15 in the direction of opening the contacts is suppressed from acting on the operator side.

Thus, it is not necessary to increase the elastic force of the pressure contact spring that gives the contact force between the contacts against the electromagnetic repulsive force, and it is possible to suppress the increase in size of the pressure contact spring. As a result, the crimping spring and the manipulator storing the crimping spring can be downsized, and the cost can be reduced.

Fig. 2 is a longitudinal sectional front view showing another embodiment of the vacuum switch mechanism of the present invention, and in fig. 2, the same reference numerals as those shown in fig. 1 denote the same parts or equivalent parts, and therefore, detailed description thereof is omitted, but in this embodiment, one fixed contact 4 and one movable contact 5, and the other fixed contact 4 and the other movable contact 5 are stored in a vacuum vessel 3 provided with an insulating cylinder 2, respectively, and a connection conductor 15 having a collector 14 in sliding contact with the outer peripheral surfaces of one operating rod 7 and the other operating rod 7 is fixed to the vacuum vessel 3 by means of soldering or the like at a lead-out portion of the vacuum vessel 3 for operation 7.

According to the present embodiment, as in the above-described embodiments, since the electromagnetic repulsive force in the direction of opening the contact generated in the connection conductor 15 is suppressed from acting on the operator side, the increase in size of the pressure contact spring can be suppressed. As a result, the crimping spring and the manipulator storing the crimping spring can be downsized, and the cost can be reduced. In addition, according to the present embodiment, the vacuum chamber 1 can be easily manufactured as compared with the embodiment shown in fig. 1.

Fig. 3 is a longitudinal sectional front view showing still another embodiment of the vacuum switch mechanism of the present invention, and in fig. 3, the same or corresponding portions are designated by the same reference numerals as those shown in fig. 1 and 2, and therefore, detailed description thereof will be omitted, and in this embodiment, one fixed contact 4 and one movable contact 5 and the other fixed contact 4 and the other movable contact 5 are stored in a vacuum container 3 provided with an insulating tube 2, respectively, and a connection conductor 15 having a collector 14 in sliding electrical contact with the outer peripheral surfaces of one operating rod 7 and the other operating rod 7 is fixed to the vacuum container 3 by a fixing member 16 such as a screw in a mold portion 6a between the vacuum containers 3 and 3 at a leading-out portion of the operating rod 7 of the vacuum container 3.

According to this embodiment, as in the above-described embodiment, since the electromagnetic repulsive force in the direction of opening the contact generated in the connection conductor 15 is suppressed from acting on the operator side, the increase in size of the pressure contact spring can be suppressed. As a result, the crimping spring and the manipulator storing the crimping spring can be downsized, and the cost can be reduced. In addition, according to the present embodiment, since the connection conductor 15 can be more firmly fixed to the vacuum chamber 3 by the fixing member 16 such as a screw, the reliability can be improved. In addition, the vacuum chamber 3 can be easily manufactured as compared with the embodiment shown in fig. 1.

Fig. 4 is a longitudinal sectional front view showing another embodiment of the vacuum switch mechanism of the present invention, and in fig. 4, the same reference numerals as those in fig. 3 denote the same or corresponding parts, and therefore, a detailed description thereof will be omitted, but in this embodiment, one fixed contact 4 and one movable contact 5 and the other fixed contact 4 and the other movable contact 5 are stored in a vacuum vessel 3 provided with an insulating tube 2, respectively, and in a molded portion 6a between the vacuum vessels 3, 3 on a lead-out portion of an operating rod 7 of the vacuum vessel 3, a connecting conductor 15 having a collector 14 in sliding electrical contact with outer peripheral surfaces of the one operating rod 7 and the other operating rod 7 is fixed to the vacuum vessel 3 by a fixing member 16 such as a screw, and an end portion of each operating rod 7 is connected to a non-conductive connecting body 9.

According to this embodiment, as in the above-described embodiment, since the electromagnetic repulsive force in the direction of opening the contact generated in the connection conductor 15 is suppressed from acting on the operator side, and the generation of the same electromagnetic repulsive force in the connection body 9 can be eliminated, the increase in size of the pressure contact spring can be suppressed. As a result, the crimp spring and the manipulator storing the crimp spring can be further miniaturized, and the cost can be reduced. In addition, according to the present embodiment, since the connection conductor 15 can be more reliably fixed to the vacuum chamber 3 by the fixing member 16 such as a screw, the reliability can be improved. In addition, the vacuum chamber 3 can be easily manufactured as compared with the embodiment shown in fig. 1.

The structure in which the connecting member 9 is nonconductive may be applied to the embodiment shown in fig. 1 to 3. In this case, the insulator 10 provided on the operating rod 11 can be omitted.

Claims (7)

1. A vacuum switch mechanism having an interrupter composed of two fixed contacts stored in a vacuum container and two movable contacts which are brought into contact with and separated from the fixed contacts, respectively,

a connection conductor having a collector in sliding electrical contact with the outer peripheral surfaces of the first and second operation levers is fixed to a lead-out portion of the vacuum container of the operation lever connected to each movable contact, and end portions of the operation levers led out of the vacuum container are connected by an insulating connecting body.

2. The vacuum switching mechanism according to claim 1,

the connection conductor is fixed to the lead-out portion of the vacuum vessel by brazing.

3. The vacuum switching mechanism according to claim 1,

the connecting conductor is fixed to a molding portion between the vacuum vessels of the operating rod guiding portion by a screw.

4. Vacuum switching mechanism according to any one of claims 1 to 3,

the one and the other levers are connected to an operator via a conductive connecting member and an insulator.

5. Vacuum switching mechanism according to any one of claims 1 to 3,

the one and the other levers are connected to the operator through a non-conductive connecting member.

6. Vacuum switching mechanism according to any one of claims 1 to 3,

the one fixed contact and the movable contact and the other fixed contact and the movable contact are stored in a common vacuum container having an insulating cylinder.

7. Vacuum switching mechanism according to any one of claims 1 to 3,

the one fixed contact and the movable contact and the other fixed contact and the movable contact are respectively stored in a vacuum container provided with an insulating cylinder.