JPH0785374B2 - Switchgear - Google Patents

Description

The present invention relates to a pull-out switchgear, and more particularly to a switchgear having a telescopic track that can be moved in and out of the cell of the device.

Circuit breakers stacked in metal enclosures or jacket structures are often withdrawable. An example of a pull-out configuration is where the circuit breaker is housed in a compartment with a front door, which must be opened to access a telescopic truck located within the compartment. As a modification of this structure, a panel that can be moved so as to allow a part of the circuit breaker to protrude from a hole formed in the front door or to allow access to the front operation portion of the circuit breaker is incorporated into the front door. There is a configuration.
Both configurations are the same in that the door must be opened to pull out the circuit breaker. A simplified truck design is known, for example from U.S. Pat. No. 3,483,338, so that the load is not applied to the truck until the circuit breaker is pulled past the full disconnect position.

If the compartment does not have a front door, the circuit breaker is provided with a front panel that completely closes the compartment opening when the circuit breaker is connected to protect workers. In such a configuration, the telescopic track is located behind the panel and it is neither possible to approach the telescopic track nor to allow the telescopic track to project beyond the front panel. Further, if there is no track supporting the breaker, the breaker cannot be pulled out due to the rolling of the rollers. As one of the methods for solving this problem, a configuration in which the circuit breaker is always supported by a telescopic track can be considered. But,
In that case, the track must be strong enough to withstand the forces associated with a short circuit, which requires considerable cost.

The gist of the present invention is, in a pull-out type switchgear for distributing power from a power source to a device that consumes power, provided with a cell having a front opening and a roller that is removably arranged in the cell and is located in the cell. A shutoff unit including an opening / closing unit, fixed terminal means supported in the cell, movable terminal means attached to the opening / closing unit and movable between the connection and disconnection positions of the fixed terminal means, and the opening / closing unit in motion. And a guide surface for supporting the opening / closing unit, which is provided in the cell and engages with the roller to support the opening / closing unit when the opening / closing unit is in the cell. Further comprising fixed tracks spaced apart from each other, further movably mounted in the vicinity of each said fixed track, for moving in and out of a cell with said opening and closing unit, The fixed unit further includes a track extension of each fixed track that supports the closing unit as it passes through the front opening, the track extension including a support surface slidably supported by the fixed track. Comprises a telescopic track that moves between a first position within the cell and a second position where the support surface projects outside the cell to support the unit, the telescopic track entering and exiting the cell with the unit. In the opening / closing device, the opening / closing unit is connected to the opening / closing unit so that the opening / closing unit can be connected.

Preferably, the opening / closing unit is removably arranged in the cell and includes a roller, and the fixed track is provided in the cell,
When the unit is inside the cell, it has a support surface that engages with the roller to support the unit, and the telescopic track has a support surface that is slidably supported on the fixed track, and the retracted position in the cell And a supporting surface of the telescopic track is movable between a protruding position where the supporting surface of the telescopic track projects outside the cell, and the opening / closing unit includes a front panel that closes the front opening when the unit is in the cell, and the telescopic track is When the unit passes through the front opening, it interlocks with the unit to move in and out of the cell together with the unit to support the unit, and the telescopic track engages with the roller to pull the telescopic track together with the unit from the cell. Including the front panel
The unit includes first and second support surfaces that engage the telescopic track as the unit moves into the cell, and the fixed and telescopic tracks each engage the roller to allow the unit to enter and exit the cell. Unit support comes first with
And the second support surface to transition between the second support surface and the second support surface.
Set slightly higher than the supporting surface.

The advantage of the device according to the invention is that the problem is solved by automatically letting the truck in and out with the circuit breaker, even though the telescopic truck is not accessible in compartments without front doors.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown, the pull-out switch 5 comprises a circuit breaker 7 and a cell or housing 9, which is similar in structure and operation to that disclosed in U.S. Pat. No. 3,483,338. is there. The circuit breaker 7 is housed in a molded housing made of high-strength phenol resin such as reinforced glass fiber. The movable terminal means or terminals 11, 13 (Fig. 1) project from the rear wall of the circuit breaker, and the fixed terminal means or stubs 15, 17 penetrating the rear wall 19 of the cell 9 are on the right side of the wall as seen in Fig. 1. It is connected to a bus bar (not shown) arranged. The circuit passing through the switch 5 starts from the stub 15 as a starting point, passes through the terminal 11, the breaker 7, and reaches the terminal 13, and further reaches the stub 17.

The cell 9 comprises side walls 21, 23, a rear wall 19 and a front opening 25.

The circuit breaker 7 comprises a front panel 27 which closes the front opening 25 when in the working or connecting position (Fig. 1). Cell 9
On both sides of the frame member 29 for supporting the circuit breaker 7,
Install 31 (Fig. 8). For this reason, each frame member has a slot for a support wheel or rollers 35, 37 mounted on a mandrel or pin 39 protruding from both sides of the circuit breaker.
Including 33. Spacer bolt 43 for each frame member 29, 31
A bracket 41 that is spacedly attached to the frame member by.

A telescopic track 45 is attached to each frame member 29, 31 and held by a corresponding bracket 41. Each bracket 41 includes a longitudinal slot 47 to provide a retaining pin on the track.
Insert 49 into this slot. The frame members also
A support bearing 51 for supporting the telescopic track in the fully extended state (Fig. 3) is also attached. When the circuit breaker 7 is in the fully actuated or connected condition (Fig. 1), the telescopic track 45 is retracted to the retracted position.

In the process of withdrawing the circuit breaker 7 from the cell 9 from the position shown in FIG. 1 to the position shown in FIG. 2, the rollers 35, 37 are engaged until the roller 35 engages a means for extending the telescopic track, for example an upward projection or a detent 55. Move leftward in the slot 33 along the support surface 53. When the unit or circuit breaker 7 is further pulled out, the force of the roller 35 applied to the protrusion 55 causes the frame member to move.
A telescopic track supported by a support bearing 51 provided at 31 moves together with the circuit breaker. Continue circuit breaker or unit 7
2 from the position shown in Fig. 2 to the position shown in Fig. 3, the roller 3
5, 37 leave the support surface 53 and move to the surface 57 of the track 45, on which the circuit breaker is supported only. As is apparent from FIG. 3, the track 45 is held by the roller bearing 51 and the holding pin 49 inserted into the slot 47 of the bracket 41.

In the process of returning the circuit breaker 7 from the completely pulled-out position (FIG. 3) to the connected or working position (FIG. 1), the panel surface 59 abuts the outer side 61 of the track 45 to move the track to the frame member 31 and the bracket 41. The rollers 35, 37 retract along the surface 57 of the track 45 until retracted to a position in between (FIGS. 4-7).
When the roller 37 is further retracted from the pulled-out position (FIG. 3), the roller 37 moves to the support surface 53 in the slot 33.

As shown by the arrow 63 in FIG. 3, the support surface 53 is a track surface 57.
Slightly higher than the height of the circuit breaker (about 0.031 inch), so that as the circuit breaker moves into the cell 9, the roller 37 and then the roller 35 rise up the inclined surface 65, and the load of the circuit breaker is expanded or contracted.
Transition from 45 to frame member 31. Next, in the roller, the circuit breaker comes to the connection position (Fig. 1) and the terminals 11 and 13 are stubs.
Continue to move in the slot until it engages 15, 17 respectively.

A lever mechanism 67 is provided to surely move the circuit breaker 7 to a position where the terminals 11 and 13 are connected to the stubs 15 and 17. The lever mechanism 67 includes an operation shaft 69, a cam lever 71 provided on the shaft, and a cam pin 73. As the circuit breaker 7 is returned into the cell, the cam pin 73 moves into the slot 33 until it reaches the right end of the slot where the upwardly curved slot cam portion 75 is provided.
Enter inside. Next, when the operating shaft 69 is manually rotated, for example, via a lever (not shown), the cam lever 71 rotates in the counterclockwise direction, causing the pin 73 to enter the slot cam portion 75, where the pin 73 is the cam portion. 75 slot surface 75a (first
(Fig.) By engaging the terminals 11, 13 and the stub 15,
Drive 17 and lock in secure electrical contact.

In addition to the terminals 11 and 13 and the terminal stubs 15 and 17, a second connector or contact 77 is retractably attached to both side walls 21 and 23 of the cell, while a secondary terminal or contact terminal 79 is provided outside the circuit breaker 7. The second connector 77 is attached so that it can be retractably engaged. Because of this, the mounting bracket
81, a guide pin 83 attached to the bracket, and a coil spring 85, and the second connector 77 is attached to the retractable means.
Attach. The second terminal 79 comprises a plurality of terminals 87 which enter into corresponding sockets provided on the second connector 77 in the intermediate or test position. Wires (not shown) extend in a conventional manner from each of the second connector 77 and the second terminal.

When moving the circuit breaker 7 into the cell 9, the circuit breaker passes through the disconnect, intermediate or test position to reach the connection position. In the disconnect position (FIG. 3), terminals 11 and 13 are separated from stubs 15 and 17 and second connector 77 and second terminal 79 are disengaged from each other. In the intermediate or test position (FIG. 2), the second connector 77 and the second terminal are connected to each other, but the terminals 11, 13 and the stubs 15, 17 are disengaged. Finally, when the circuit breaker reaches the connecting position (when reaching FIG. 1, the terminals and the stubs 11-17 connect to each other, the second connector 77 and the terminal 79
Also connect to each other.

As is clear from the above description, the switchgear of the present invention is supported by the fixed track in the cell, and the telescopic track automatically protrudes from the cell without the need to separately operate the track as in the known structure. Provides a circuit breaker that retracts inward.

[Brief description of drawings]

FIG. 1 is a side view showing the opening / closing device of the present invention in a state in which a unit that can be pulled out is completely accommodated in an associated cubicle or cell. FIG. 2 is a first view showing a state in which a unit that can be pulled out is partially pulled out from a cubicle or a cell.
The side view similar to a figure. FIG. 3 is a side view similar to FIG. 2 showing a state in which the retractable unit is completely pulled out from the operating position of FIG. 1 and is supported by a telescopic track. Fourth
The drawing is a plan view taken along the line IV-IV in FIG. FIG. 5 is an elevation view of the frame and the telescopic track. FIG. 6 is a plan view taken along the line VI-VI in FIG. FIG. 7 is an end view taken along the line VII-VII in FIG. 5: Switchgear 7: Circuit breaker 9: Cell 13: Movable terminal 15: Fixed terminal 27: Front panel 31: Frame member 45: Telescopic track

Claims (10)

[Claims] 1. A pull-out switch for distributing power from a power source to a device that consumes power, the switch having a cell having a front opening and a roller detachably disposed in the cell and positioned in the cell. A disconnecting unit composed of a unit, fixed terminal means supported in the cell, movable terminal means attached to the opening / closing unit and movable between connection and disconnection positions of the fixed terminal means, and the opening / closing unit in motion. And a guide means for supporting the guide means,
A pull-out opening and closing device including spaced apart fixed tracks provided in a cell and having support surfaces for engaging the rollers to support the opening and closing unit when the opening and closing unit is in the cell. Is a track extension of each fixed track that is movably mounted near each of the fixed tracks, moves in and out of the cell together with the opening and closing unit, and supports the opening and closing unit when passing through the front opening. The track extension further includes a support surface slidably supported by the fixed track, and supports the unit at a first position in the cell and the support surface projects outside the cell. Characterized in that it comprises a telescopic track that moves between a second position and a second position, the telescopic track being coupled with the opening and closing unit so that it can be moved in and out of the cell with the unit. The opening and closing device. 2. The fixed tracks spaced apart from each other
The switchgear according to claim (1), characterized in that it is arranged near both sides of the switchgear unit. 3. An opening / closing device according to claim 2, wherein each track extension is slidably attached to a corresponding fixed track. 4. The opening / closing according to claim 3, wherein the track extension includes means for extending the track extension as the opening / closing unit moves outward from the cell. apparatus. 5. The opening and closing unit includes a surface that engages the track extension to move the track extension into the cell as the unit moves into the cell. Switchgear according to the range (4). 6. The opening and closing unit includes a front panel that closes a front opening when the unit is in a cell, the panel including the surface for engaging a track extension. The switchgear according to item (5) in the range. 7. The telescopic track includes means for engaging the open / close unit to allow the telescopic track to project with the open / close unit.
The switchgear according to the item. 8. The opening / closing unit according to claim 1, wherein the opening / closing unit includes means for engaging the telescopic track to retract the telescopic track into the cell. Switchgear. 9. The telescopic track of claim 1, wherein the telescopic track includes a detent that engages a roller to cause the telescopic track to project from the cell with the unit.
The switchgear according to item (7) or (8). 10. The telescopic track includes a first support surface for engaging the roller when the unit is outside the cell, and the fixed track includes a second support surface for engaging the roller when the unit is inside the cell. The second support surface is set to be slightly higher than the first support surface so as to transfer the unit support between the first support surface and the second support surface in accordance with the movement of the unit in and out of the cell. The switchgear according to claim (1), (7), (8) or (9).