JP2000261918A - Switchboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an insulation distance and facilitate accommodation of a shutter in the case of connection by overlapping an upper plate and a lower plate and making the height in the vertical direction about a half. SOLUTION: A frame 11 having a window 11a is installed movably between portions P and Q. A shutter 18, constituted of an upper plate 19 and a lower plate 20, is installed movable vertically in the frame 11. When the frame 11 is at the positioned P, the upper plate 19 is caught by a stopper 32, and the shutter 18 turned into a state of one plate closes the window 11a. When the frame 11 moves to the position Q, a follower 28 rolls along a rail 30, and the lower plate 20 overlaps with the upper plate 19 and moves to a part above a bushing 5. As a result, the window 11a is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard, and more particularly to an improved shutter for covering a disconnecting portion of a draw-out circuit breaker.

[0002]

2. Description of the Related Art A circuit breaker is housed in a switchboard, and a drawer-type circuit breaker is used as the circuit breaker so that the circuit breaker can be pulled out to be maintained and inspected. If the disconnecting part that disconnects the connection with the draw-out type circuit breaker is opened when the draw-out type circuit breaker is pulled out, a contact accident such as electric shock may occur, so a shutter that closes the disconnection part is provided. The shutter must satisfy the rated withstand voltage in all cases when closed, opened and closed, and opened. It is more safe to use a metal as the material of the shutter and to ground the shutter.

As a shutter in a conventional switchboard,
There are a rotary shutter and a shutter shutter. When the drawer-type circuit breaker is not carried in as shown in FIG. 5 (a), the shutter 3 attached to the tip of the arm 2 which is rotatable about the rotary shaft 1 is a rotary shutter. When the drawer-type circuit breaker is carried in, the shutter 3 rotates upward as shown in FIG. 5B, and the contact of the drawer-type circuit breaker is closed. 6 is connected to the conductor 4. In this case, A, B, are the safe distances. 9 is a partition.

[0006] In the shutter of the shutter type, the shutter 7 closing the opening of the bushing 5 as shown in FIG.
When the draw-out circuit breaker is carried in, it moves vertically upward as shown in FIG. 6 (b). In this case, C and D are safe distances.

[0005]

However, when the size of the switchboard is reduced, the creepage distance cannot be reduced, and when a metal shutter is used, a fixed insulating space is formed between the conductor 4 and the shutters 3 and 7. Because of the necessity, the dimensions of the bushing 5 cannot be reduced so much, and the space for accommodating the shutter becomes narrow, and interference occurs as shown by E in FIG. 7A. In the case of the shutter type, even if the shutter is divided and the shutter is overlaid and pulled up, the shutter is opened as shown in FIG.
As shown in F of FIG. 2B, the distance from the charging unit cannot be sufficiently set, and a metal shutter cannot be used.

When the size is reduced, it is conceivable that the insulating space between the insulators becomes narrower. If partial creepage is caused, the use of a shutter made of an insulator may cause a short circuit between the phases.

Therefore, an object of the present invention is to provide a switchboard which solves the above problem.

[0008]

According to a first aspect of the present invention, a switchboard is provided with a bushing protruding from a partition wall in a circuit breaker room, and a drawer-type circuit breaker is connected inside the bushing. A switchboard provided with a conductor for opening the opening of the bushing when the draw-out circuit breaker is carried into the circuit breaker chamber, and having a shutter for closing the opening when carrying out the circuit breaker. A frame movable to the vicinity is provided, biasing means for returning the frame pressed to the vicinity of the partition wall to a position short of the opening is provided, and a shutter for opening and closing the opening of the bushing is provided on the frame. The upper plate and the lower plate attached to the frame so as to be able to move up and down, and the lower plate is slid relative to the upper plate to form a laminated plate or a single plate. The frame is provided with first guide means for guiding the upper plate and the lower plate so as to be able to move up and down freely, and the lower plate is bushed when the frame is moved from just before the opening of the bushing to near the partition. A second guide means is provided for pushing up from the height near the lower surface of the bushing to the height of the upper surface of the bushing. When the frame is located in front of the opening of the bushing, the upper plate is hooked and the lower plate is lowered, so that the shutter is a single plate. In this state, the stopper is provided so as to close the opening of the bushing, and when the shutter is located in the vicinity of the partition, the shutter is in the state of a laminated plate and the opening of the bushing is opened.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a switchboard according to the present invention will be described below.

As shown in FIG. 1, a bushing 5 protrudes from a partition wall 9 that separates the circuit breaker chamber from the other chamber toward the circuit breaker chamber. Is provided. Frame 11
Has a U-shaped cross-sectional shape in which both ends of a rectangular plate are bent at right angles, and has a long hole-like shape large enough to allow the three-phase bushing 5 to be inserted at a position corresponding to the upper and lower three-phase bushings 5. Windows 11a are respectively formed. Wheels 12, 13 are provided on the upper and lower sides of the frame 11, and the upper and lower wheels 12, 1 are provided.
Rails 14 and 15 for mounting 3 are mounted on the upper, lower, left and right sides of the circuit breaker room.

When the pressing force is removed when the frame 11 movably provided along the rails 14 and 15 is pushed from the position P just before the opening of the bushing 5 to the position Q near the partition 9, In order to return to the P position, return springs 1 as urging means are provided on both sides of the breaker chamber.
6 is provided, and a pin 17 that engages with the tip of a return spring 16 is fixed to the frame 11.

The frame 11 is provided with a shutter 18 for closing the pair of windows 11a. Shutter 18
Is constructed by connecting an upper plate 19 and a lower plate 20 by sliding means. That is, the bolts 21 inserted into the holes formed at both ends of the upper plate 19 are inserted into the elongated holes 22 formed vertically at both ends of the lower plate 20, and the lower plate 20 is moved relative to the upper plate 19. The shutter 18 can be made into a single-plate state or a stacked-plate state by sliding the shutter 18 in an appropriate manner. A spring 23 is provided on both sides of the upper plate 19 via pins 24 so as to constantly urge the lower plate 20 downwardly against the upper plate 19 so as to be in a single plate state. The tip of 23 is engaged with the pin 25 of the lower plate 20. Since the lower plate 20 is subject to its own weight, the spring 23
Is not necessary.

When the frame 11 is at the position P, the shutter 18 is in the state of a single plate and closes the window 11a.
When it occupies the position, it is set to be in the state of a stacked plate and to move onto the bushing 5. Upper plate 19, Lower plate 2
The rods 26 and 27 are fixed to both ends of the
A follower 28 is rotatably attached to the tip of the. On the other hand, on both sides of the frame 11, elongated holes 29 are formed vertically as first guide means, and rods 26 and 27 are loosely fitted in the elongated holes 29.

A bent portion 19a is formed at the upper end of the upper plate 19 so that the shutter 18 becomes a single plate and closes the window 11a when the frame 11 occupies the P position. Is fixed to a stopper 32 having an L-shaped cross section.

When the frame 11 occupies the P position, the shutter 18 is suspended by the stopper 32, so that the shutter 18 becomes a single plate, thereby closing the opening of the window 11a and the bushing 5, and the frame 11 moves to the Q position. When occupied, a rail 30 is provided as second guide means to push up the follower 28 to raise the shutter 18 to a state of a stacked plate and to rise above the bushing 5. The rail 30 includes an inclined portion and a horizontal portion.

As shown in FIG. 2, pressing portions 31a are provided on both sides of a draw-out type circuit breaker 31 which is carried into and out of the circuit breaker room.
Are formed respectively. On the other hand, receiving portions 11b are formed at positions corresponding to the pressing portions 31a in the frame 11, respectively.

Next, the operation of the switchboard will be described. When the draw-out circuit breaker is carried out of the circuit breaker room, the tip of the return spring 16 urges the pin 17 as shown in FIG. 1, and the frame 11 occupies the P position. At this time, since no external force is applied to the shutter 18 and the bent portion 19a of the upper plate 19 is caught by the stopper 32, the lower plate 20 is lowered by its own weight, and the shutter 18 is in a single plate state, and the window 11a, namely, the bushing 5 is closed. Accordingly, it is possible to prevent an accident that a person enters the breaker room into which the draw-out type circuit breaker is carried out and inserts a hand into the bushing 5.

Next, as shown in FIG. 2, the draw-out type circuit breaker 31 is carried into the circuit breaker room, and the frame 11 is moved by the four pressing portions 31a.
When the receiving portion 11b is pressed, the frame 11 is pushed from the P position to the Q position against the urging force of the return spring 16. At this time, since the follower 28 rolls on the rail 30 and rises, the lower plate 20 to which the follower 28 is attached rises against the urging force of the spring 23, and the lower plate 20 overlaps with the upper plate 19, as shown in FIG. As shown in FIG. When the shutter 18 is in the state of the stacked plate, the bushing 5
4C, the opening of the bushing 5 is opened and the contact 6 of the draw-out circuit breaker 31 is connected to the conductor 4 in the bushing 5 as shown in FIG. At this time, the safety distance S becomes longer than before. FIG. 4 shows the relationship between the bushing 5, the conductor 4, the shutter 18, and the contact 6 from the state in which the draw-out circuit breaker 31 is carried out to the state in which it is carried in.

When the draw-out type breaker is carried out of the breaker room, the frame 11 is moved from the Q position to P by the urging force of the return spring 16.
Move to position. At this time, the wheels 2 along the rail 30
After the bent portion 19a is caught on the stopper 32, the upper plate 19 is moved by the urging force of the spring 23 and its own weight.
In contrast, the lower plate 20 is relatively lowered, and the shutter 18 is in a single plate state, and closes the window 11a and the opening of the bushing 5.

When the frame 11 occupies the P position,
Frame 1 not only around the opening of bushing 5 but also around it
Since it is closed at 1, the person cannot contact not only the inside but also the outside of the bushing 5, and the danger can be reliably prevented. As shown in FIG. 4B, when the lower plate 20 of the shutter 18 rises and overlaps the upper plate 19, the shutter 18 does not come into contact with the contact 6, and no interference accident occurs.

[0021]

As can be seen from the above description, claim 1
According to the switchboard according to the above, since the shutter is composed of the upper plate and the lower plate, the upper plate and the lower plate overlap even if the metal shutter cannot be adopted when the switchboard is downsized in the conventional configuration. Therefore, the height in the vertical direction is reduced to about half, so that the insulation distance can be secured and the shutter can be easily stored at the time of connection. Further, when the shutter is opened, the shutter is located near the partition wall, so that the safety distance is long, so that a metal shutter can be adopted and the safety of the disconnection portion, which is a problem when the switchboard is downsized, is improved. Can be.

[Brief description of the drawings]

1A is a plan view of a part of FIG. 1B, FIG. 1B is a front view, and FIG.
(C) is a right side view.

FIG. 2 is a view for explaining the operation of a shutter section in a switchboard according to the present invention.

3 (a) is a front view and FIG. 3 (b) is a right side view relating to a shutter unit when a draw-out circuit breaker is connected in the switchboard according to the present invention.

FIG. 4 is an explanatory view relating to a shutter portion of the switchboard according to the present invention, and carrying in a drawer-type circuit breaker from a disconnection position to a connection position.

FIG. 5 relates to a rotary shutter in a conventional switchboard;
(A) is a block diagram at the time of unloading of the draw-out circuit breaker, (b) is a block diagram at the time of loading.

FIG. 6 relates to a shutter shutter of a conventional switchboard;
(A) is a block diagram at the time of unloading of the draw-out circuit breaker, (b) is a block diagram at the time of loading.

7A and 7B relate to a shutter in a case where a conventional switchboard is miniaturized. FIG. 7A is an explanatory diagram of a rotary shutter, and FIG. 7B is an explanatory diagram of a shutter shutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Conductor, 5 ... Bushing 11 ... Frame 12, 13 ... Wheel 14, 15 ... Rail 16 ... Return spring 18 ... Shutter 19 ... Upper plate 20 ... Lower plate 21 ... Bolt 22, 29 ... Long hole 26, 27 ... Rod 28 ... Follower 30 ... Rail 32 ... Stopper

Claims (1)

[Claims] 1. A bushing projecting from a partition wall is provided in a circuit breaker room, and a conductor for connecting a draw-out type circuit breaker is provided inside the bushing, and the bushing is opened when the draw-out type circuit breaker is carried into the circuit breaker room. In the switchboard provided with a shutter that closes the opening when the unit is opened, a frame that is movable from just before the opening of the bushing to the vicinity of the partition is provided, and the frame that has been pushed to the vicinity of the partition is positioned just before the opening. A return means is provided, and a shutter is provided on the frame to open and close the opening of the bushing. The shutter has an upper plate and a lower plate individually attached to the frame so as to be vertically movable, A first means for guiding the upper plate and the lower plate so that the upper plate and the lower plate can be moved up and down. The guide means is provided on the frame, and the second guide means is provided for pushing up the lower plate from the height near the lower surface of the bushing to the height of the upper surface of the bushing when the frame is moved from just before the opening of the bushing to the vicinity of the partition, When the frame is located in front of the opening of the bushing, the upper plate is hooked and the lower plate is lowered, so that the shutter becomes a single plate and a stopper for closing the opening of the bushing is provided. The switchboard is characterized in that the shutter is set to be in the state of a laminated plate to open the opening of the bushing.