JPS5822923B2 - disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in disconnectors suitable for use in closed switchboards.

The power distribution system of power receiving and transforming equipment for general industrial customers connects a breaker, such as a vacuum breaker or oil-filled breaker, to one side of the negative disconnection section, and connects the power bus bar to the other side through a disconnector. are doing.

Generally, the former is called the load side, and the latter is called the power supply side.

In this power distribution system, if a short circuit occurs on the power supply bus, the circuit breaker shuts off and prevents the accident from expanding to the load side.

Therefore, the power receiving and transforming equipment on the load side is out of power.

When power receiving and substation equipment is used for water supply, sewerage, chemical plants, steel manufacturing, etc., power outages cannot be tolerated, so two disconnectors are installed.
I am using a stand.

In other words, a spare disconnect switch and power bus are installed.

This has the advantage that even if an accident occurs with the disconnect switch on the -mount side, the power receiving and transforming equipment on the load side can be operated without a power outage using the disconnect switch on the other side.

On the other hand, since two disconnectors are used, the disconnectors become larger and the closed switchboard inevitably becomes larger accordingly.

An object of the present invention is to provide a compact and one-piece disconnector.

The disconnector of the present invention includes a first fixed contact at one end of an insulating support, a first movable contact connected to a first coupling portion at the other end, and a bushing disposed corresponding to the insulating support. A fixed contact that opens and closes with the first movable contact is provided at one end, a movable contact that opens and closes with the Doi first fixed contact at the other end, and the fixed contact and the movable contact are closed and closed. If the insulating support and the bushing are shifted to one side so that the inclinations of the movable contact and the first movable contact are in the same direction, when both movable contacts are opened, the width dimension Since the disconnector does not have to be widened, the disconnector can be made smaller without increasing its size.

Hereinafter, an embodiment of the present invention will be described in which a disconnector is used in the closed switchboard shown in FIG.

A power distribution box 1 is provided at one end, and when a door 2 for opening and closing is opened, a grounding partition 3 is provided that forms a room in which each electrical device is housed.

Open the door 2, move the circuit breaker 4 into the distribution box from the outside, and connect it to the next disconnector 5.

- One side of the next disconnection section 5 is connected to a cable pend 7 supported by an insulator 6, and the other side 5A is connected to a disconnection section 10 via a contactor 8.

In the disconnector 10, an insulating support 111, an insulator, and a bushing 12 are attached to the ground partition 3 so as to correspond to each other.

A fixed contact 13 is connected to one end of the bushing 12 via the contact 8, and a movable contact 1 is connected to the other end of the bushing 12 via a coupling portion 14.
5 are connected, and when the movable contact 15 rotates about the connecting portion 14 as a fulcrum, the movable contact 15 is attached to the other end of the insulating support 11 and opens and closes with the first fixed contact 16.

A first connecting portion 1T is connected to one end of the insulating support 11 via a first connecting portion 1T.
A movable contact 18 is coupled, the first movable contact being a first
When the coupling part 17 is rotated as a fulcrum, it opens and closes with the fixed contact 13 as shown by the chain line, and also connects the fixed contact 13 with the first
The insulating support 17 is arranged so that the joint with the movable contact 18 (see FIG. 2) and the first joint 17 do not correspond to each other.
It is arranged so that it is shifted to the left side with respect to the plane of the drawing, that is, in a direction in which the primary side disconnecting section 5 is moved away.

The first fixed contact 16 and the first movable contact 18 are connected to a power supply bus 21 supported by an insulator 20 attached to the ceiling surface.
It is connected to A and 21B.

To open and close the movable contact 15 and the first movable contact 18 with the fixed contact 13 and the first fixed contact 18, attach the movable contact 15 and the first movable contact 18 to the grounding bulkhead 3 corresponding to the door 2 and operate the operator 25 to open and close the link. 26.

Therefore, when the operator is operated, the disconnector opens and closes the current between the power supply bus and the primary disconnector.

This disconnector 10 is provided with a movable contact 15 at the other end of the bushing 12 and a first movable contact 18 on the insulating support 11 on the opposite side of the movable contact 15. Since the insulating support 11 is shifted to the movable contact side so that the contact fBA does not correspond to each other,
When the movable contact 15 and the first movable contact 18 are opened, the width 11 is the width I! of the conventional disconnector 100 shown in FIG. Less than 2.

In other words, since there is a relationship l)2>11, the disconnector 10 can be made smaller, and in the conventional disconnector 100, the movable contact 180 and the bushing 120 are connected at the coupling part 170, so the movable contact When opening 180, it comes close to the ground partition wall portion 3B, so it is necessary to provide a wide insulation distance, and the width becomes substantially larger.

Also, when the movable contact 150 and the fixed contact 13 are closed and the movable contact 180 is opened, the movable contact 180, the power bus 21B, and the ground bulkhead portion 3
Since they are not at the same potential as B, an insulating distance between them is required.

Therefore, high dimensions are required.

On the other hand, in the disconnector 20 of the present invention, the movable contact 1
5 is in contact with the first fixed contact 16, and when the first movable contact 18 is in an open state with the fixed contact 13,
Since the first movable contact 18 and the power bus 21B are at the same potential, the first movable contact 18 can be brought closer to the power bus 21B.

As a result, the insulation distance between the first movable contact 18 and the corresponding ground partition portion 3B! 13 can be made sufficiently large, the height dimension H can be narrowed.

Therefore, if the disconnector 20 of the present invention is used in a closed switchboard, the height and width of the switchboard 1 can be reduced, and the closed switchboard can be made smaller.

In order to use the disconnector of the present invention in a closed switchboard, a movable contact and a fixed contact are provided on the insulating support and the bushing on the side corresponding to the breaker, and the movable contact and the fixed contact are provided on the bushing on the opposite side. The movable contact side 1 is arranged so that the insulating support is shifted in the direction away from the breaker.

In other words, both movable contacts may be arranged so as to be inclined in the same direction with both movable contacts closed to the double-sided fixed contact.

In the above, a disconnector suitable for use in a closed switchboard is explained.However, in the case of a disconnector applied to other electrical equipment, one movable contactor is attached to the end of the bushing on the right side of the page. and the other movable contact is provided at the end of the left insulating support, and both movable contacts and the corresponding fixed contact are in contact with each other, and both movable contacts are tilted in the same direction. If you shift the bushings and place them like this,

Alternatively, the movable contact 15 may be provided on the insulating support 11 side as shown by the chain line in FIG.

The joint portion at this time is 14'.

As described above, in the present invention, when the fixed contact and the movable contact provided at both ends of the insulating support and the bushing are closed, the insulating contact at both ends is tilted in the same direction. By arranging one of the support and the bushing offset from the other insulating support or the bushing, the disconnector can be made smaller.

[Brief Description of the Drawings] Fig. 1 is a schematic sectional view of a closed switchboard shown as an embodiment of the present invention, Fig. 2 is a sectional view of a disconnector of the present invention used in Fig. 1, and Fig. 3 is a sectional view of a disconnector according to the present invention. 1 is a sectional view of a disconnector shown as a conventional example. 11... Insulating support, 12... Bushing, 13... Fixed contact, 15...
Movable contact, 16...First fixed contact, 18.
...First movable contact.

Claims (1)

[Claims] 1. An insulating support with a movable contact on one end and a fixed contact on the other end, a fixed contact that opens and closes with the movable contact on one end, and a movable contact that opens and closes with the fixed contact on the other end. In a disconnector having one bushing arranged in correspondence, one of the insulating support and the bushing is arranged so that the movable contact and the fixed contact tilt in the same direction when the movable contact and the fixed contact are closed. A disconnector characterized in that the other insulating support is arranged offset from the bushing.