JPH0649042Y2 - Door interlock device for switchboard transformer room - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a transformer trolley mounted in a transformer trolley in a transformer room of a switchboard so as to be movable between an operating position and a disconnecting position. The present invention relates to an interlock device for a door of a transformer room that enables safe maintenance / inspection of the above.

[Conventional technology]

FIG. 3 is a side sectional view of a transformer chamber according to the prior art.
In the figure, in the transformer room 4 above the switchboard 3, the primary side of the transformer 1 mounted on the transformer truck 2 is the power fuse 1a.
And bushing 9 to the busbar. The secondary side of the transformer 1 is connected to a load such as an instrument via a low voltage fuse 1b. By rotating the screw rod 8, the transformer truck 2 is moved to the interlocking position / disconnecting position to close / disconnect the transformer 1 and the bushing 9. The nameplate 7 is used to display the operation and disconnection of the transformer cart 2 by operating the screw rod 8. The cover 6 is tightened with bolts 5 so that a person does not easily touch the charged part of the transformer 1.

As a maintenance / inspection method for the transformer 1, the screw rod 8 is rotated to move the transformer truck 2 on which the transformer 1 is placed to the disconnecting position on the right side, and after confirming that the nameplate 7 is in the disconnecting position, the cover 6
Maintenance such as replacement of the transformer 1 and its fuses on the primary and secondary sides by removing the bolt 5 and opening the cover 6
Inspecting.

[Problems to be solved by the invention]

In the above-described conventional maintenance / inspection method for the transformer 1, if the transformer trolley 2 is not in the disconnecting position and the cover 6 is opened in the operating position, a person may touch the charging part. There is a problem that such a dangerous state, that is, lack of safety.

It is an object of the present invention to solve the above problems and provide a transformer truck with higher safety.

[Means for solving problems]

In this invention, a transformer truck is installed in a transformer chamber so as to be movable between an operating position and a disconnecting position.A door is attached to the upper surface of the transformer chamber by a hinge, and the transformer truck is installed along the rear surface of the door. An interlock door fitting that extends in the moving direction and has an opening in the disconnection position is fixed, and an interlock carriage fitting that locks the interlock door fitting in the operating position is fixed to the transformer carriage. .

[Action]

In FIG. 1, an interlock door fitting 12 fixed to the rear surface of the door 10 and extending in the moving direction of the transformer truck 2 and having an opening 12a in the disconnecting position direction is provided when the transformer truck 2 is in the operating position. The door 10 is locked by the interlock carriage bracket 13 to prevent the door 10 from opening. When the transformer truck 2 is moved to the disconnection position, the interlock truck bracket 1 is opened from the opening 12a.
3 is removed, the lock is released, and the door 10 is opened. The door 10 has a fixed opening direction with the hinge 10a, and this direction and the extending direction of the interlock door fitting 12 are substantially orthogonal to each other, so that the door is not opened in the extending direction in the interlock state. The action is shown by hinge 10a.

〔Example〕

FIG. 1 is a side sectional view showing an embodiment of this invention, and FIG.
The figure is a front view of the main part as viewed from the direction of arrow A in FIG. FIG. 1 shows the state in which the transformer truck 2 is in the operating position by a solid line, and shows a part of the state in which it is in the disconnection position by a broken line. The transformer truck 2 equipped with the transformer 1 is movable by wheels 2a on the rail inside the transformer chamber 4 above the switchboard 3. By rotating the screw rod 8 coupled to the screw 2b fixed to the transformer truck 2 from the outside of the transformer chamber 4, it is possible to move between the operating position and the disconnecting position. A door 10 which can be opened and closed by a hinge 10a is attached to the upper surface of the transformer chamber 4, and when the door 11 is opened by removing the bolt 11 that is normally tightened, the transformer 1 and the transformer 10 are installed there. The power fuse 1a and the low voltage fuse 1b on the secondary side can be inspected and replaced. On the back surface of the door 10, an interlock door metal fitting 12 extending parallel to the moving direction of the transformer truck 2 along the back surface is provided.
Is fixed. The interlock door fitting 12 has an opening 12a having an open end in the disconnecting position direction. On the other hand, the transformer truck 2 is provided with an interlock carriage metal fitting 13 so as to stand upright, and a locking portion 13a at the end thereof locks the interlock door metal fitting 12 in the operating position so that the door does not open. It is like this. When the transformer truck 2 is moved in the direction of the disconnection position, the locking portion 13a opens the opening 12a of the interlock door fitting 12.
At the disconnection position, the locking portion 13a completely unlocks the interlock door fitting 12 so that the door can be opened. If the locking positions of the metal fittings 12, 13 are set as far away from the hinge as possible, the force for opening the door will not be increased by the lever principle and the locking parts will not be damaged. The part that secures the interlock door bracket 12 to the door 10 is the opening 12a.
It is not limited to the opposite side, and may be fixed by one line in the longitudinal direction of the interlock door fitting.

[Effect of device]

This invention uses an interlock door fitting on the door that can be opened and closed with a hinge and an interlock carriage fitting on the carriage.
At the disconnection position of the transformer, the door is released from the interlock,
Since the door is interlocked in the driving position, it does not depend on the attention of the person like a nameplate, and it is possible to prevent the risk of electric shock due to a person touching the charging part by mistake in the driving position.
This has the effect of ensuring the safety of maintenance and inspection of the transformer. Further, by setting the locking position of the interlock door metal member and the interlock carriage metal member to a position away from the hinge, the force for opening the door is not increased by the lever principle and the locking portion is not damaged.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of this invention, and FIG.
1 is a front view of the main part of FIG. 1 as viewed from the direction of arrow A, and FIG. 3 is a side sectional view of a transformer chamber according to a conventional technique. 1 ... Transformer, 2 ... Transformer trolley, 3 ... Switchboard, 4 ...
… Transformer room, 6 …… Cover, 9 …… Bushing, 10 ……
Door, 10a ... Hinges, 12 ... Interlock door fittings, 13 ...
Interlock truck bracket.

Claims (1)

[Scope of utility model registration request] 1. In a transformer movably provided in a transformer chamber between an operating position and a disconnecting position, a door is attached to the upper surface of the transformer chamber by a hinge, and the door at a position away from the hinge is provided. An interlock door fitting that extends along the back surface in the moving direction of the transformer truck and has an opening in the disconnecting position is fixed, and the interlock door fitting that locks the interlock door fitting in the operating position is provided. A door interlock device for a switchboard transformer room, characterized in that a lock truck metal fitting is fixed to the transformer truck.