JPS6035883B2 - How to prevent broken power lines from falling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for preventing a disconnection from falling when a distribution line is struck by lightning and disconnected.

Distribution lines covered with 3.3 to 22KV class insulators that are attached to utility poles may be disconnected due to direct lightning strikes or induced electricity, and in such cases, the disconnected distribution lines may fall to the ground, causing damage to people and animals. Very dangerous.

Generally, when lightning strikes a power distribution line, the supporting insulators are struck by 1.
Since most of the lightning strikes occur in the area up to 5.5, conventionally, a wrapping grip was wrapped around the distribution lines beyond this range to prevent broken wires from falling. However, it takes a lot of time to wrap this wrapping grip around the power distribution line, and it is not easy to fix the grip so that it can withstand the impact when the wire breaks. In addition, a method is being considered in which a support insulator with a distribution line attached or a support arm with a support insulator attached is connected to the distribution line at a distance of 1.5 skins or more using a strong string, but this method also does not work. It is not a suitable method as it requires a lot of work to be done at high places. An object of the present invention is to provide a method that can reliably prevent a broken distribution line from falling in a relatively simple manner. A fall prevention device attached to the distribution line at a position relatively close to the insulator, a half-sheathed body installed on the support arm on which the support insulator is installed, and protecting the distribution line near the support insulator; If the above-mentioned distribution line between the position where the above-mentioned fall prevention device is installed and the above-mentioned support insulator is broken, the broken length will be The fall prevention odor and the connection line hold the long distribution line to prevent it from falling, and the broken short distribution line is held by the half sheath body to prevent it from falling, the method comprising:
The fall prevention odor comprises an outer tube and an inner tube inserted into the outer tube and gripping the distribution line by passing it through its own central hole, and the inner tube has an inner surface and an outer surface of the inner tube. At least one of the inner tubes is formed into a conical shape, and the inner diameter of the inner tube is made to be reducible, so that when the distribution line falls, the inner diameter of the inner tube is vertically reduced to hold the distribution line more firmly. It's because I did it.

FIG. 1 is a diagram illustrating a method for preventing a broken power distribution line from falling, which is an embodiment of the present invention.

A support insulator 3 is attached to a support arm 4 fixed to a utility pole, and a power distribution line 2 is connected to the support insulator 3. A half sheath body 5 housing the distribution line 2 is installed on the support arm 4, a support insulator 3 is inserted into a hole in the center of the half sheath body 5, and a plurality of connecting wires 6 are attached to both ends. There is. The connecting wire 6 is a strong metal wire or glass fiber wire, and is firmly connected to the fall prevention device 1 through which the power distribution line 2 is fixed. The position where such a fall prevention odor 10 is attached to the distribution line 2 is at least 1.5 skins away from the support insulator 3, and it is expected that the distribution line 2 will break within this range when struck by lightning. It's the location. The fall prevention device shown in the distance in FIG. 1 is shown attached in this way.
FIG. 2 is a perspective view of the outer tube 11 of the fall prevention odor 10 of FIG. 1.

The outer tube 11 is a combination of half tubes having an annular groove on the outer surface, and a coupling ring 13 shown in FIG. 3 is fitted with iron into this groove to form an integral structure.

The coupling ring 13 is a C-shaped strong metal ring having a cut portion, and the gap between the cut portions is larger than the outer diameter of the power distribution line 2 . Further, when the cut surfaces of the half tubes are brought into contact with each other, they can be inserted into the outer surface of the outer tube 11 and fit into the groove. Note that the connecting wire 6 is firmly attached to the outer tube 11, but when a long, broken distribution line falls on the outer tube 11, the wires 600 to 100
Since an impact force of about 0k9 is applied, the outer tube 11, the connecting wire 6, and the half sheath body 5 shown in FIG. 1 must have enough strength to withstand it. On the other hand, the inner tube 12 shown in a perspective view in FIG. 4 has a circular outer shape, and has a plurality of protrusions on the hole surface whose inner diameter is equal to or slightly smaller than the outer diameter of the distribution line 2 shown by the dashed line. This is a pipe cut in half and facing each other.

A small coupling ring 14 similar to that shown in FIG. 3 is iron-fitted into a groove formed in an annular shape on its outer surface to form an integral structure. To attach the fall prevention device 10 made of such a capital material to the distribution line 2, first surround the distribution line 2 so that the thick part of the inner tube 12 faces the half-sheath body 5, and then The connecting ring 14 through which the distribution line 2 has passed is attached to the groove of the inner pipe 12. Next, the outer tube 11
is attached to the inner tube 12 so as to surround the thin walled portion of the inner tube 12, the coupling ring 13 is inserted into the groove, and finally the end of the connecting wire 6 is firmly attached to the outer tube 11. The fall prevention odor 10 shown in the distance in FIG. 1 shows the state in which it is installed in this manner. Lightning strikes the distribution line 2 and the fall prevention device 10 and support insulator 3
When the distribution line 2 between the two is cut, the long side of the broken distribution line 2 falls due to gravity.

However, the separated power distribution line 2 is grasped by the conical inner tube 12, and this inner tube 12 is connected to the outer tube 1 fixed to the half-sheath body 5.
1, the inner tube 12 is supported by the tensile force 15.
When it is pulled, it penetrates deeply into the outer tube 11 and reduces its inner diameter, and the protrusion further bites into the insulator layer, causing the distribution line 2
Tighten firmly. Therefore, the fall prevention tool 10 reliably holds the end of the disconnected power distribution line 2 to prevent it from falling.
The fall prevention odor 1 shown on the front side of FIG. 1 shows the state of Makoto.

The half sheath body 5 may be made of a corrosion-resistant metal or synthetic resin material as long as it can withstand the impact force when the distribution line 2 falls.

Further, the same applies to the fall prevention odor 10, but in particular, the coupling ring 13 of the outer tube 11 needs to be made of a metal with strong corrosion resistance. In order to connect the outer tube 11 more securely, when the connecting wire 6 is wound around the outer tube and attached,
The bonding ring 13 becomes unnecessary. As described above, the method for preventing a broken power distribution line from falling according to the present embodiment provides the following effects by using the half sheath body and the fall prevention device attached to the overhead line portion of the power distribution line.

1. It securely holds a long broken power distribution line and prevents it from falling, and since the part close to the supporting insulator rests on a half body, it does not sag.

2. Both the half-sheath body and fall prevention device can be easily installed, so installation is simple and does not require advanced technology.

3.Protrusions are provided on the hole surface of the inner tube to ensure that the insulator of the distribution line is gripped, and since the inner tube is conical, the impact force when the wire is dropped will further tighten the wire, reducing the risk of wire breakage. Falling is reliably prevented.

In the above embodiment, the outer tube 11 and inner tube 12 of the fall prevention odor 10 are made into half tubes in order to facilitate installation on the distribution line 2, but it is preferable to install a fall prevention device in advance when installing the distribution line. In this case, a conical external tube with a single cutting line machined in the direction of the ball can be used as the inner tube, whose diameter can be reduced by external pressure, and a cylindrical tube without a cutting line can be used as the outer tube to allow the pipe to fall. A preventive device can be configured.

In this case as well, the effect is the same as in the above example, and the bonding ring 13
does not require. The method for preventing the fall of a broken distribution line according to the present invention has the effect of preventing the fall of a distribution line when it is struck by lightning by a relatively simple means.

[Brief explanation of the drawing]

Fig. 1 is a diagram illustrating a fall prevention method for broken power lines, which is an embodiment of the present invention, Fig. 2 is a perspective view showing the external appearance of the fall prevention device shown in Fig. FIG. 4 is a perspective view of the inner tube inserted into the outer tube of FIG. 2. FIG. In the figure, 2 is a power distribution line, 3 is a support insulator, 4 is a support arm,
5 is a half sheath body, 6 is a connecting line, 1 is a fall prevention device, 11 is an outer tube, and 12 is an inner tube. Oh figure, figure 2, figure 3, figure 4

Claims (1)

[Scope of Claims] 1. A fall prevention device attached to the distribution line at a position relatively close to a support insulator to which the distribution line covered with an insulator is fixed;
a half sheath body installed on the support arm on which the support insulator is installed and on which the distribution line near the support insulator is placed; a continuous wire connecting the fall prevention device and the half sheath body or the support arm; If the above-mentioned distribution line between the position where the above-mentioned fall prevention device is installed and the above-mentioned support insulator is disconnected, the above-mentioned fall prevention device and the above-mentioned connecting wire will hold the long broken distribution line and prevent it from falling. In this method, the short distribution line is held by the half sheath body to prevent it from falling, and the fall prevention device is inserted into an outer pipe and the outer pipe to prevent the distribution line from falling. an inner tube that is gripped by passing through a central hole of the inner tube, and at least one of the inner surface of the outer tube and the outer surface of the inner tube is formed into a conical shape, and the inner diameter of the inner tube can be reduced. A method for preventing a broken power distribution line from falling, characterized in that when the power distribution line falls, the inner diameter of the inner tube is reduced to more firmly hold the power distribution line. 2. The method for preventing the fall of a broken power distribution line as set forth in claim 1, wherein the outer tube and the inner tube are tubes formed by opposingly combining members divided into a plurality of parts parallel to the tube axis.