JP2550981Y2 - Grounding device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding device used, for example, in a transformer for grounding type instruments.

[0002]

2. Description of the Related Art FIG. 3 is a plan view of a conventional grounding device used for a grounding type instrument transformer, and FIG.
It is a V arrow view. In the drawing, reference numeral 1 denotes a support seat protruding from a support wall (not shown), 2 denotes an insulating plate supported on the support seat 1 via bolts and nuts 3, 3, and 4 denotes one end of the insulating plate 2. The first conductive bolt 5 attached to the other end of the insulating plate 2 via the conductive nut 6 is connected to the second conductive bolt 5 via the conductive nut 6 in parallel with the first bolt 4. One end of the bolt 7 is connected to a circuit portion (not shown), and the other end is a circuit lead electrically connected to the first bolt 4 via a nut 6. The other end is a ground lead that is electrically connected to the second bolt 5 via the nut 6.

[0003] 9 is a conductive washer, 10 is a terminal portion provided on the front end side of the first bolt 4 and the second bolt 5, respectively.
Reference numeral 11 denotes a conductive plate-like ground link which can be easily removed between the terminal portions 10 and 10 through a hole 11a (see FIG. 5). Reference numeral 12 protects the ground link 11 and the like, and 12 It is an opening / closing door that is opened and closed in the direction of the arrow for attachment to and detachment from the terminal portions 10 and 10.

FIG. 5 shows the details of the terminal portion 10 of the first bolt 4, 13 is a conductive washer attached to the step portion 4a of the first bolt 4, and 14 is a small-diameter screw portion of the first bolt 4. A conductive washer nut screwed into 4b, 15 is a conductive nut. The same terminal portion 10 is provided at the position of the small-diameter screw portion 5b also for the second bolt 5.

Next, the operation of the grounding device will be described. The ground link 11 is connected to the first through the openings 11a, 11a.
The small-diameter screw portion 4b of the bolt 4 and the small-diameter screw portion 5b of the second bolt 5 are inserted into the small-diameter screw portion 4b.
When the ground link 11 is attached to the terminals 10 and 10 by tightening the nut 3 and the nuts 14 and nuts 15 with washers, the circuit portion on the circuit lead 7 side connects the first bolt 4, the ground link 11, and the second bolt 5 to each other. This is electrically connected to the ground lead 8 side via this. Therefore, in this state, the grounding-type instrument transformer is operated for grounding.

Next, when it is necessary to stop the grounding operation and release the grounding on the circuit portion side, as in the case of measuring the insulation resistance of the circuit portion, the door 12 is opened forward and the nut 15 and It is necessary to remove the nut 14 with the washer from the small-diameter screw portions 4b and 5b of the first and second bolts 4 and 5, and to remove the ground link 11 from both the terminal portions 10 and 10.

[0007]

However, in the above-mentioned conventional grounding device, when the grounding operation is started next after the grounding is released, the operator connects the grounding link 11 to the terminal portion 1.
There was a risk that the user would forget to attach it to 0,10. If re-operation (grounding operation) is performed without attaching the ground link 11 to the terminal portions 10, 10, the circuit portion is not grounded. May occur.

The present invention has been made to solve the above-mentioned problem. Even if the ground link is removed from the terminal portion when the ground is released, the user must not forget to attach the ground link to the terminal portion during re-operation. It is an object to provide a grounding device that does not occur.

[0009]

According to the present invention, one terminal connected to the circuit portion and the other terminal connected to the ground portion are connected by a conductive ground link, and the ground is released. In a grounding device in which the ground link is removed from both terminal portions and the periphery of the ground link is covered by an opening / closing door, the ground link removed from the terminal portion is released in the vicinity of the terminal portion when grounding is released, and the opening / closing door Is provided with a projection which engages with the residual ground link and does not close the opening / closing door.

[0010]

In the present invention, upon release of the ground, the ground link removed from the pair of terminals is left near the terminals, and the projection provided on the door is engaged with the residual ground link. Therefore, the door cannot be closed with the ground link removed from the terminal. Therefore, the operator can easily recognize whether or not the ground link is attached to the terminal portion based on whether or not the opening / closing door is open.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a grounding device used in a grounded-type instrument transformer showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of the grounding device. In the figures, FIGS.
The same or corresponding parts as those of the conventional grounding device shown in FIG.

In the figure, reference numeral 21 denotes an upper portion of one end and a lower portion of the other end thereof engage with the small-diameter thread portions 4b and 5b of the first and second bolts 4 and 5 of the terminal portions 10 and 10, respectively. Key-shaped notches 21a and 21b are formed,
A conductive plate-like grounding link having a long hole 21c formed in the center portion, and a rear end side of the support seat 1 is provided with a nut 23 via a nut 23.
And a small-diameter portion 22a on the front end side
Is an insulating bolt inserted into the long hole 21c of the ground link 21, 24 is a washer for holding the ground link 21 rotatably on the small-diameter portion 22a of the bolt 22, 25 is a bolt which is a ground link 21 or the washer 24. A pin 26 for preventing falling off from the small-diameter portion 22 a of 22 is a pair of guide plates as projections attached to the opening / closing door 12 that covers the upper and lower portions of the ground link 21.

Next, the operation of the grounding device will be described. When performing the grounding operation of the grounding type transformer, use the grounding link 2
The first notches 21a and 21b are engaged with the small-diameter threaded portions 4b and 5b of the first and second bolts 4 and 5, and both ends of the ground link 21 are fixed to the washer 13, the nut 14 with the washer and the nut 15. Then, the ground link 21 is connected to the two terminals 10 and 10. Further, when it is necessary to stop the grounding operation of the grounded-type instrument transformer and release the grounding of the circuit portion on the circuit lead 7 side in order to measure, for example, insulation resistance, the open / close door 12 is moved forward. After opening
The tightening of the ground link 21 by the nuts 14 and 15 with washers in the terminal portions 10 and 10 is loosened.

Next, the ground link 21 is moved to the left in FIG. 2 by the width of the notches 21a and 21b, and then the ground link 21 is moved counterclockwise in FIG. About 90 degrees in the direction. In this state, the ground link 21 is removed from the two terminal portions 10 and 10, so that the circuit portion on the circuit lead 7 side is released from the ground, and measurement of insulation resistance and the like can be performed.

In this case, since the direction of the ground link 21 is changed from the horizontal direction to the vertical direction, even if the door 12 is to be closed, the guide plates 26, 26 abut against the ground link 21, and the door 12 is closed. Cannot be closed. Therefore, the worker can sufficiently recognize whether or not the ground link 21 is attached to the terminal portions 10 by checking whether or not the opening / closing door 12 is open. The grounding operation of the grounded-type instrument transformer is not performed without being attached to the sections 10 and 10, and an accident such as dielectric breakdown does not occur in the circuit section and the like.

Next, the ground link 21 is connected to the terminals 10, 1
0, the ground link 21 is connected to the bolt 22
2 around the small-diameter portion 22a in the clockwise direction in FIG. 2, and cut out the notches 21a and 21b of the first and second bolts 4 and 5 between the washer 13 and the nut 14 with the washer.
After the ground link 21 is slid to the right in FIG. 2, the ground link 21 is moved to the small diameter of the first and second bolts 4 and 5 at the deepest of the notches 21 a and 21 b. The screw portions 4b and 5b are engaged. When the nuts 14 and nuts 15 with washers are tightened, the ground link 21 is attached to the terminal portions 10 and 10. When the door 12 is closed, the terminal portion 1 of the ground link 21 is closed.
The work of attaching to 0 and 10 ends.

As described above, the ground link 21 is connected to the terminal 1
Even if the ground link 21 is removed from the
Are left in the vicinity of the terminals 10, 10, and the guide plate 26 that engages with the remaining ground link 21 is
, The door 12 cannot be closed unless the ground link 21 is attached to the terminals 10, 10. Therefore, the operator does not perform the grounding operation of the grounded-type instrument transformer without erroneously attaching the grounding link 21 to the terminal portions 10, 10, thereby preventing occurrence of an accident such as insulation breakdown.

Although the above embodiment has been described with reference to the grounding device for the grounding type transformer, the present invention can be applied to other grounding devices as long as the grounding device is for mounting and removing the grounding link 21. it can.

[0019]

As is apparent from the above description, according to the present invention, one terminal connected to the circuit part and the other terminal connected to the ground are connected by a conductive ground link. In a grounding device that is connected and the ground link is removed from both terminal parts when releasing the ground, and the surrounding of the ground link is covered with an opening / closing door, the ground link removed from the terminal part when releasing the ground is placed near this terminal part. Since the door is left with a projection that engages with the residual ground link and does not close the door, the door cannot be closed when the ground is released, and the worker attaches the ground link to the terminal. It is possible to prevent the device having the grounding device from being restarted while forgetting to prevent the occurrence of an accident such as insulation breakdown.

[Brief description of the drawings]

FIG. 1 is a plan view of a grounding device showing an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the grounding device showing one embodiment of the present invention.

FIG. 3 is a plan view showing an example of a conventional grounding device.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a detailed view of a terminal portion of a conventional grounding device.

[Explanation of symbols]

 8a Grounding part 10 Terminal part 12 Door 21 Opening / closing door 26 Grounding link 26 Guide plate (projection)

Claims (1)

(57) [Scope of request for utility model registration] 1. A terminal connected to a circuit portion and another terminal connected to a ground portion are connected by a conductive ground link, and when the ground is released, the two terminal portions are connected to the ground. In a grounding device in which the link is removed and the periphery of the grounding link is covered by an opening / closing door, the grounding link removed from the terminal portion is released near the terminal portion when grounding is released, and A grounding device comprising a projection that engages with a residual grounding link and does not close the door.