JPH0140254Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a power distribution board equipped with a potential transformer equipped with a protective fuse.

Generally, potential transformers connected to high voltage circuits are
For maintenance and inspection purposes, the primary protection fuse is often mounted on a single trolley and automatically connected to the switchboard as a pull-out device. By the way, this type of voltage transformer must be completely pulled out from the power distribution board during maintenance or inspection. Regardless of whether the instrument transformer is installed at a high location, even when it is installed at a low location, using a lifter or the like to pull it out from the switchboard will result in a decrease in operating efficiency. Additionally, if it becomes possible to perform maintenance and inspection without having to pull out the voltage transformer from the switchboard, the space required to pull out the voltage transformer can be omitted, which can greatly contribute to downsizing the switchboard.

In view of the above-mentioned circumstances, this idea was developed to allow maintenance and inspection of a power distribution board equipped with a voltage transformer equipped with a protective fuse to be performed easily, simply, and quickly without having to pull the voltage transformer out of the panel. It provides a switchboard.

The embodiments shown in the drawings will be described below.

Figure 1 shows a power distribution board that implements this idea. In the figure, 1 is the switchboard housing, 2 is the door, 3 is the power busbar, 4 is the load busbar, 5 is the bushing, 6 is the disconnector, 7 is the grounding bulkhead, and 8 is the storage frame for the potential transformer 9. , 10 is a conductor to supply load current to the instrument transformer 9, 11 is a bushing of the conductor 10, 12 is a protective fuse mounted on the instrument transformer 9, and 13 is a connecting conductor that is inserted into and removed from the bushing 11. It is provided on the instrument transformer 9 so as to protrude forward. 14
can be moved in and out of the storage frame 8 using a trolley.

Therefore, the storage frame 8 in which the instrument transformer 9 is housed
An opening 8a is provided on the upper surface of the opening 8a.
A movable plate 15 is mounted to cover the. As shown in FIG. 2, this storage frame 8 has a movable plate 15 closed during non-maintenance inspection of the instrument transformer 9, and one end of which is locked by a horizontally movable presser metal fitting 16. has been done. A handle 17 is provided on the top surface of the movable plate 15 on the drawer side, and a ground wire 18 is provided on the opposite end.
are installed respectively.

As shown in FIG.
A ground terminal 20 is attached via 9.
A sliding guide 21 is attached to the lower surface of the storage frame 8, facing the other end of the movable plate 15. This sliding guide body 21 prevents the movable plate 15 from rotating when it is closed, and guides the movable plate 15 vertically downward when it is opened, and is a groove body provided with a slope 21a.

Further, as shown in FIGS. 5 and 6, the movable plate 15 is provided with a guide 22 that slidably holds both ends of the movable plate 15 and includes a shaft portion 22a. The guide 22 is rotatably supported by the storage frame 8 via a shaft portion 22a.

Next, the effect of this invention will be explained.

When maintaining or inspecting the instrument transformer 9, as shown in FIG.
Remove from 1. In this case, the trolley 14 is pulled out so that the connecting conductor 13 is located directly below the guide 22. Next, slide the presser metal fitting 16 to remove it from the movable plate 15, and remove it from the movable plate 1 through the handle 17.
Lift 5 upward. The movable plate 15 is the guide 22
When the movable plate 15 rotates around the shaft portion 22a and gradually moves upward, the movable plate 15 slides down because it is held by the guide 22, and the one end having the ground terminal 20 is connected to the ground via the insulating plate 19. It comes into contact with the sliding guide 21 and slides down its slope 21a. and,
When the movable plate 15 reaches a substantially vertical position, it disengages from the sliding guide 21 and falls vertically under its own weight, coming into contact with the connecting conductor 13 of the voltage transformer 9. If the movable plate 15 comes into contact with the connecting conductor 13,
The charging current present in the potential transformer 9 and the protective fuse 12 flows to earth via the ground wire 18. At this time, since the insulating plate 19 is interposed between the movable plate 15 and the connection terminal 20, the charging current does not flow through the movable plate 15, and the worker who operates the handle 17 of the movable plate 15 is safe. It is. Therefore, if the movable plate 15 is manually operated until it becomes approximately vertical, the grounding operation will be automatically performed after that by falling due to its own weight. Therefore, the instrument transformer 9 can be safely maintained and inspected through the opening 8a of the storage frame 8, and after the work is finished, the movable plate 1 is pulled up and rotated to a horizontal position.

According to this invention described above, an opening 8a is formed in the upper part of the storage frame 8 that houses the voltage transformer 9, and the opening 8a is opened during maintenance and inspection to charge the voltage transformer 9 that has been pulled out. Since the movable plate 15 that falls under its own weight is rotatably and slidably installed in the housing frame 8 using the guide 22 in order to connect the parts with the grounding wire 18, there is no need to pull out the instrument transformer 9 to the outside of the switchboard. Moreover, maintenance and inspection of the instrument transformer 9 can be performed simply and quickly in a grounded and safe state, and the efficiency of maintenance and inspection work can be improved. Also, if the movable plate 15 falls vertically, the bushing 1
It also has the advantage of serving as a partition wall from the live part of No. 1.

Moreover, the present invention has an extremely simple structure and does not pose any operational or functional difficulties, so the grounding action is automatic and reliable, and there is little danger.
Moreover, the manufacturing cost is also low.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one embodiment, FIG. 2 is an enlarged view of section A in FIG. 1, and FIG. 3 is a partial view taken along the line B-B in FIG.
Figure 4 is a detailed sectional view of section C in Figure 2, and Figure 5 is a detailed cross-sectional view of section C in Figure 2.
FIG. 6 is a perspective view of the guide, and FIG. 7 is an explanatory view of the operation of this invention. 8... Storage frame, 9... Instrument transformer, 12...
Protective fuse, 13... Connection conductor, 14... Cart, 15... Movable plate, 16... Holding metal fitting, 17...
...Handle, 18...Grounding wire, 19...Insulating plate,
20...Grounding terminal, 21...Sliding guide, 21a
...Slope, 22...Guide, 22a...Shaft, 2
3...Bearing.

Claims (1)

[Scope of utility model registration request] Protective fuse 12 and connecting conductor 1 protruding forward
In a power distribution board equipped with a storage frame 8 for storing an instrument transformer 9 equipped with a voltage transformer 9 in a freely drawn out manner, an opening 8a is formed in the upper part of the storage frame 8, and a movable plate is provided in the upper part of the storage frame 8 so as to cover the opening 8a. A ground terminal 20 is connected to one end of the movable plate 15 via an insulating plate 19, and the ground terminal 2
0, and further connect the movable plate 15 to
A sliding guide body 21 is fixed inside the lower surface of the upper part of the storage frame 8 facing one end, and both ends of the movable plate 15 are slidably held therein, and a guide 22 having a shaft portion 22a is attached to the It is pivotally supported on the storage frame 8 near the sliding guide 21, and when the instrument transformer 9 is pulled out and the movable plate 15 is opened, the movable plate 15 is in a vertical position and is stored in that state. A power distribution board characterized in that it is configured to fall into a frame 8 so that a grounding terminal 20 and a connecting conductor 13 can come into contact with each other.