JPS58940Y2 - cutout grounding device - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a cutout grounding device used to prevent electric shock accidents for maintenance workers of pole transformers installed on overhead power distribution lines.

To inspect the inside of a transformer, short-circuit each pole lead of the transformer and ground it with the high-voltage cutout open to keep all parts at the same potential and prevent leakage of high-voltage current due to contamination or other causes. To ensure work safety, the transformer is prevented from being charged due to this.

However, with the current state of advanced insulation, there is no way to connect a safety ground wire to the bare conductive chamber unless a high-voltage cut-out electrode is used.

The present invention relates to a cutout grounding device for connecting a safety grounding wire using this high voltage cutout electrode, and its purpose is to ensure that it will never be connected to a charging terminal even if operated incorrectly. That is.

An example embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a telephone pole, 2 is a cross arm, 3 is a pole-mounted transformer, 4 is a ground side connector, 5 is a grounding clip, A is a cylindrical cutout, 6 is a cylindrical insulator, 7 is a main body support bracket, 8 is a branch line from the high-voltage distribution line, 9 is a contact on the power supply side, 10 is a fuse tube insertion space, 11 is a contact on the transformer lead wire side, 12 is an electric wire connected to the primary side of transformer 3, 13 is a composite wire The lower cylindrical part is made of resin.

In the present invention, as shown in FIGS. 1 to 3, the grounding clip 5 connected to the grounding connector 4 is connected to the covered wire
7, and this covered electric wire 27 is branched into a plurality of wires (three wires in this embodiment) via a branch connector 28.

28a shown in Figure 3 is a copper crimp sleeve, 28
b is the inner bushing made of PVC, 28C is the outer bushing, 2
8 d is a tightening band made of polyethylene.

In addition, a gripping insulating rod 30 made of synthetic resin is fitted to the end of each branched covered electric wire 29, and is fitted with the grounding electrode (transformer lead wire side contact) 11 of the cylindrical high pressure out-out) A. A hole 31a is formed in the end face of the electrode 31, and the electrode 31 is screwed into the end of the insulating rod 30 while being connected to the electric wire 29.

31b is a threaded portion, 31C is a crimp terminal for connecting to the electric wire 29, 32 is a cord holder, and 33 is a bushing for protecting the cord.

Further, a cutout grounding device C is constructed by slidably providing a collar 34 on the insulating rod 30 that fits into the lower cylindrical portion 13 of the cylindrical high pressure outlet L-A.

In addition, in the figure, 30a is a fixed collar part formed integrally with the insulating rod 30, 35 is a string connected to the branch connector 28 to assist in suspending this grounding device C, and 36 is a string 35 connected to this string 35.
This is a hook that is connected to the armrest 2, etc.

This hook 36 is preferably provided with an insulating coating.

Next, the operation of the cutout grounding device of the present invention constructed as described above will be explained.

First, when grounding the cylindrical high-pressure cut-out (C) A, as shown in Figures 1 and 2,
hook 36 on the armrest 2, connect the grounding clip 5 to the grounding side connector 4, and then disconnect the electrode 31 at the tip of the insulating rod 30 by removing the fuse tube (not shown). The cylindrical high-pressure outlet) is inserted into the grounding electrode 11 of A.

In this case, the collar 34 also fits into the lower cylindrical portion 13 of the cutter l-A.

Therefore, if the flange 34 is adjusted to an appropriate position on the insulating rod 30, the electrode 31 will not be able to penetrate further into the power supply side contact 9.
There is no possibility of contact with.

The reason why the flange 34 is made slidable with respect to the insulating rod 30 is as follows.
This is because the dimensions between the grounding electrode 11 and the lower cylindrical portion 13 of the cylindrical high-pressure outlet (A) differ slightly depending on the manufacturer.

That is, by sliding the collar 34, the collar 34 can be brought into close contact with the lower cylindrical portion 13 of the cylindrical high-pressure cutout A.

Then, by sealing the lower opening of the cylindrical high-pressure cutout A with the collar 34, waterproof and dustproof effects can be obtained.

Therefore, according to the present invention, electric shock accidents caused by erroneous operation can be completely prevented.

As described above, the present invention has an excellent effect in that even if an operation is performed incorrectly, the conductive part will never come into contact with the charging terminal, so there is no risk of electric shock, and work safety can be ensured.

[Brief explanation of drawings]

Fig. 1 is an elevational view showing an example of the use of the device of the present invention, Fig. 2 is a partial sectional view showing a state in which a part of the device of the present invention is inserted inside a cylindrical high-pressure cutout, and Fig. 3a is a FIG. 1 is an explanatory diagram of a cut-out grounding device according to the present invention, and the figure is a partial sectional view thereof. 4...Ground side connector, 5...Grounding clip, A...Cylindrical high voltage cutout, 1
1...Grounding electrode, 13...Lower cylindrical part, B...Box-shaped high voltage cutout, 14...
... Main body, 14 a ... Partition wall, 15 ...
...Recess, 24...Empty space, C...Grounding device for cutout, 27.29...Insulated wire, 30...Insulation for gripping Rod, 31... Electrode, 31 a... Screw hole, 34... Tsuba.

Claims (1)

[Scope of utility model registration request] The other side of the covered electric wire 27, which is connected to one end with the grounding clip 5 connected to the ground side connector 4, is branched into a plurality of wires, and an insulating rod 30 for gripping is attached to the end of each branched electric wire 29.
The electric wire 2 is fitted with an electrode 31 that fits into the grounding electrode 11 of the cylindrical high voltage cutout A at the end of the insulating rod 30.
9, and is provided with a flange 34 on the insulating rod 30, which is slidably adjustable and fitted with the lower cylindrical portion 13 of the cylindrical high pressure outlet)-A.