JPH0974620A - Switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drive an isolator and a grounding switcher with a single driving means. SOLUTION: A movable side conductor 37 is provided between a DS fixing contact 35 for constituting an isolator and an ES fixing contact 36 for constituting a grounding switcher and a movable contact 38 where one edge can approach and leave the DS fixing contact 35 and the other edge can approach and leave the ES fixing contact 36 is penetrated through a movable side conductor 37 so that they can freely slide and the movable contact 38 is linked and connected to a driving means 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear, in which a disconnecting switch and a grounding switch are operated by a single drive means.

[0002]

2. Description of the Related Art A switchgear having a circuit breaker or the like is provided with a disconnector and a ground switch. FIG. 3 shows a disconnecting switch and a grounding switch in a conventional switchgear. In the figure, 1 is a disconnecting switch,
Reference numeral 2 is a grounding switch, 3 is a disconnecting switch operating box, and 4 is a grounding switch operating box. The disconnector 1 is composed of a fixed contact 5, a contact holder 6, a contact holder 7, and a movable contact 8. Then, one end of the movable contact 8 for three phases is interlockingly connected to the operation shaft 9 reciprocally rotated by the disconnector operation box 3 via three connecting rods 10. On the other hand, the ground switch 2 includes a fixed contact 11 provided on the contact holder 6 and a movable contact 13 that slides on the contact holder 12. The operation shaft 16 is operatively connected to the output shaft 14 of the earthing switch operating box 4 via an arm (not shown) and a rod 15.
The movable contacts 13 for three phases are interlocked with each other via three arms 17. Reference numeral 18 is a tank filled with insulating gas.

In such a switchgear, the movable contact 8 is reciprocally driven by the disconnector operating box 3 to connect or disconnect the disconnector 1. Further, the movable contact 13 is reciprocally driven by the grounding switch operating box 4 to open / close the grounding switch 2.

[0004]

However, since two disconnecting switch operating boxes and two grounding switch operating boxes are provided independently, it is difficult to save space and hinders downsizing of the switchgear. Further, since two operation boxes are assembled, many parts are required and it takes a long time to assemble the switchgear, resulting in a high cost. Further, since the operation box is provided outside the tank, a rotary seal bearing is required between the tank filled with the insulating gas and the output shaft, and there are many parts that cause gas leakage.

Therefore, an object of the present invention is to provide an opening / closing device that solves the above problems.

[0006]

In order to achieve such an object, the present invention has a dual purpose between a DS fixed contact and an ES fixed contact for arranging a disconnecting switch and a grounding switch on the same straight line. A movable conductor is provided on the movable side conductor so that one end of the movable fixed conductor can be brought into contact with and separated from the DS fixed contact and the other end can be brought into contact with and separated from the ES fixed contact. ES
It is characterized in that the length of the movable contact is set to a length such that it does not come into contact with both of the fixed contacts at the same time, and the movable contact is linked to the driving means.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

(A) First Embodiment FIG. 1 shows a first embodiment of a switchgear according to the present invention. As shown in the figure, the tank 21 filled with the insulating gas is connected to the conduit 23 via the insulating spacer 22, and the insulating spacer 2
It is connected to the pipe line 25 via 4. And blind plate 2
The openings are closed by 6, 27 and 28.

Between a busbar conductor 29 introduced from the pipe line 23 into the tank 21 through the insulating spacer 22 and a busbar conductor 30 introduced from the pipe line 25 into the tank 21 through the insulating spacer 24. A circuit breaker 31 and a disconnector 32 are provided in the. A grounding switch 34 is provided between the grounded fixed plate 33 and the busbar conductor 30.

Next, the structure of the disconnecting switch 32 and the grounding switch 34 will be described below. The DS fixed contact 35 forming the disconnector 32 is connected to one terminal of the circuit breaker 31, while the ES fixed contact 36 forming a ground switch 34 is connected to the fixed plate 33. The bus bar conductor 3 is provided between the DS fixed contact 35 and the ES fixed contact 36.
A movable side conductor 37 connected to 0 is provided, and a movable contact 38, one end of which can be brought into and out of contact with the DS fixed contact 35 and the other end of which can be brought into and out of contact with the ES fixed contact 36, is slidable via a ring contact 39. Through the movable side conductor 37.

An operation box 40 is provided in combination with the blind plate 26 for driving the movable contact 38.
A drive means 41 for driving the circuit breaker 31 and a drive means 42 for driving the movable contact 38 are housed in the operation box 40. The output shaft of the drive means 42 is interlockingly connected to the screw shaft 45 via the gear 43 and the operation shaft 44, and the screw shaft 45 is rotatably supported. Screw shaft 4
A female thread portion of a support fitting 46 is screwed onto the connector 5, and the support fitting 46 is coupled to the movable contact 38 via an insulating member 47.

Next, the operation of the opening / closing device will be described.
When inspecting the busbar conductor 30 by shutting off the circuit breaker 31, first, the screw shaft 45 is rotated in one direction by the driving means 42 to separate the movable contact 38 from the DS fixed contact 35 and disconnect the disconnector 32. Disconnect. When the screw shaft 45 is continuously rotated in one direction as it is, the busbar conductor 30 and the fixed plate 33 are connected via the movable contact 38, and the busbar conductor 3 is connected via the ground switch 34.
0 is grounded. Therefore, the bus conductor 30 can be inspected.

When the inspection or the like is completed, the screw shaft 45 is rotated in the other direction by the driving means 42. Then, the movable contact 38 moves to the left in FIG. 1, the ground switch 34 is opened, and then the disconnector 32 is closed. Therefore, the closing operation of the circuit breaker 31 can be performed.

Since the drive means such as the disconnector 32 and the drive means for the breaker 31 are housed in the same operation box 40, the control wiring can be easily routed. In addition, since they are housed in the same operation box 40, manual operation can be performed at one place.

(B) Second Embodiment Next, a second embodiment of the switchgear according to the present invention is shown in FIG.
In this embodiment, the ground switch 34 is removed from the first embodiment without attaching the fixed plate 33 and the ES fixed contact 36.

Since there is no grounding switch 34 as compared with the first embodiment, the busbar conductor 30 is not grounded even when the disconnector 32 is opened. The other configurations and operations are the same as those in the first embodiment, and thus the description thereof will be omitted.

[0017]

As can be seen from the above description, according to the switchgear according to the present invention, the movable contact of the disconnecting switch and the grounding switch are combined into one, so that the driving means can also be combined and the switchgear is opened and closed. The number of parts of the device is reduced and the cost can be reduced. Further, it is possible to easily set only the disconnecting switch and the disconnecting switch with the ground switch.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a switchgear according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of a switchgear according to the present invention.

FIG. 3 is a front view and (b) is a right side view of a main part of a conventional opening / closing device.

[Explanation of symbols]

 29, 30 ... Bus conductor 32 ... Disconnector 34 ... Grounding switch 35 ... DS fixed contact 36 ... ES fixed contact 37 ... Movable side conductor 38 ... Movable contact 42 ... Driving means 45 ... Screw shaft 47 ... Insulating member

Claims (1)

[Claims] 1. A movable contact having a movable side conductor provided between the DS fixed contact and the ES fixed contact, one end of which is movable to and from the DS fixed contact and the other end of which is movable to and from the ES fixed contact. Provided slidably on the conductor,
The length of the movable contact is set so that when one of the DS fixed contact and the ES fixed contact comes into contact with the other, the length of the movable contact is set, and a single drive means for reciprocating the movable contact is provided to disconnect the switch. A switchgear comprising a switch and a ground switch.