JP3653202B2 - Support structure between overhead wires - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an overhead electric wire in which two-phase or three-phase overhead distribution lines are maintained at predetermined intervals to connect the phases to each other, to ensure electrical insulation and to prevent mechanical separation. The present invention relates to a support structure between wires.
[0002]
[Prior art]
In the past, when a wire breakage due to lightning damage, an accidental accident, or a wire breakage due to deterioration occurred, the wire fell to the ground while being charged, and there was a concern about human injury such as an electric shock accident.
Therefore, conventionally, a high-voltage bar-shaped spacer made of porcelain that connects between wires (phases) is attached to an appropriate position on the overhead wire so that the broken portion of the wire does not hang down to the ground. However, he was trying not to hang down to the height that people could touch.
And the attachment of the porcelain high-voltage rod-like spacer to the conventional three-phase (R, S, T-phase) overhead wire has been performed by attaching spacers between the RS phase and between the ST phases (two in total are required). .
[0003]
[Problems to be solved by the invention]
However, attaching a large amount of high-pressure bar-like spacers on a wide distribution line in terms of area requires a large amount of cost.
Moreover, since the current high-pressure bar-shaped spacer uses a porcelain material, the weight increases and the load on the electric wire is large. In addition, this high-pressure bar-shaped spacer made of porcelain is susceptible to impact, so if it falls, it will break easily due to the drop impact, and it will have some weight and the material will be relatively stiff. If it was dropped, there was a risk of injury to people walking underneath the wire.
[0004]
The present invention has been devised in view of such points, and an object thereof is to provide an inter-wire support structure that can prevent drooping of electric wires in a simple and low-cost manner.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the present invention, a rope having electrical insulation is stretched between a plurality of parallel overhead wires while maintaining a predetermined distance between adjacent wires, and the stretched rope The distance between the wires in the length direction is at least a distance shorter than the distance from the overhead wire to the ground, and the overhead wire is supported between wires by preventing the drooping of the wire when the wire is broken by the stretched rope. The rope is formed by impregnating a core rope made of aramid fiber with an electrically insulating organic monomer.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front explanatory view of a rope used for supporting between electric wires according to the present invention, FIG. 2 is an explanatory plan view showing an example of a state in which the electric wires are supported using the rope, and FIG. FIG. 4 is an explanatory plan view showing another embodiment in a state where the wires are supported using a rope, and FIG. 5 shows still another embodiment in a state where the wires are supported using a rope. It is a plane explanatory view.
[0007]
First, in FIG. 1, an insulating rope 1 used in the present invention is formed by coating a core material rope with a rubbery resin such as an elastomer resin that maintains flexibility and has excellent tracking resistance.
An aramid fiber such as nylon may be used as the core material rope. This is because, despite the small diameter, it can have a strong tensile holding force comparable to that of a conventional porcelain bar-shaped spacer. In particular, when a low-cost general-purpose product such as a nylon rope is used as a core rope, a dramatic cost reduction can be achieved.
As the elastomer resin coated on the core rope, RTV silicone or LTV silicone is used. Alternatively, a silicone compound filled with an inorganic substance containing crystal water such as hydrated alumina or magnesium hydroxide using RTV silicone or LTV silicone as a base trimmer may be applied to the rope surface.
The core of the insulating rope 1 can be impregnated with an electrically insulating inorganic monomer or organic monomer. In addition, an aromatic polyamide fiber or an aliphatic polyamide fiber can be used for the insulating rope 1, and an arc extinguishing resin can be used for the insulating rope 1.
[0008]
As an example of the shape of the insulating rope 1, as shown in detail in FIG. 1, when three-phase (R, S, T phase) overhead wires are stretched together, each phase (R, In order to be able to support the S and T-phase electric wires as a unit by winding them with a winding grip, knot rings 1a and 1c are provided at the corresponding positions of the electric wires, that is, at both ends, and knot rings 1b are provided in the middle. In addition, when attaching only between R-S phases and between S-T phases, what is necessary is just to make knot ring 1a, 1c only at both ends.
[0009]
FIG. 2 is a view showing an example of a configuration in which such an insulated rope 1 is stretched between three-phase (R, S, T-phase) electric wires and supported, and viewed from above.
As shown in this figure, the three-phase (R, S, T-phase) transmission lines 3a, 3b, 3c installed in parallel between the steel towers 2, 2 are maintained at a predetermined interval in the electric wire length direction. It is erected.
Then, the knot rings 1a, 1b, 1c formed on the insulating rope 1 are attached by the conventional winding grip 4 entangled with the R-phase electric wire 3a, the S-phase electric wire 3b, and the T-phase electric wire 3c, respectively. An insulating rope 1 is stretched between 3a, 3b, and 3c (see FIG. 3).
In this case, the distance L (see FIG. 2) between the stretched ropes 1 is at least shorter than the distance from the overhead wires 3a, 3b, 3c to the ground, for example, the wire 3a is disconnected. Even if it hangs down, it is supported by the rope 1 connected to the other electric wires 3b and 3c, so that the broken portion of the drooping electric wire 3a does not reach a position where a person on the ground can reach.
[0010]
Since this insulating rope 1 is flexible and lightweight, the knot rings 1a, 1b, 1c can be easily made at the positions corresponding to the electric wires, and the knot rings 1a, 1b, 1c can be made by conventional winding. By attaching using the attachment grip 4, it can be easily stretched between the electric wires 3a, 3b, 3c, so that the supporting operation between the electric wires 3a, 3b, 3c is easy.
[0011]
The insulating rope 1 used in the present invention is extremely light and soft compared to a conventional porcelain bar-shaped spacer, so that the load applied to the electric wire is greatly reduced. In addition, because it is a lightweight and soft rope, even if it is accidentally dropped from a high place during aerial installation work, it will not be damaged by a drop impact, and it will be injured even if it hits a person walking underneath. No worries
[0012]
FIG. 4 is an explanatory plan view showing another example of a state in which the electric wires are supported using an insulating rope. Three-phase (R, S, T phase) electric wires 3a, 3b, 3c are connected to one insulating rope. 1 is an example in which the insulation ropes 1 are stretched and supported in a staggered manner on the wires 3a and 3b between the RS phases and the wires 3b and 3c between the ST phases. In this case, the rope length is short enough to connect the adjacent electric wires, and knot rings need only be made at both ends. By making a difference in the insulation position between the phases, it is possible to reduce the probability of a three-phase simultaneous short circuit due to a lightning flash. This attachment means is also a means to be applied to a two-phase installation electric wire.
[0013]
FIG. 5 is an explanatory plan view showing still another embodiment in a state where the wires are supported using an insulating rope. When the insulating rope 1 is attached, between the RS phases (between the wires 3a and 3b) and between the ST phases (the wires 3b). , 3c) and changing the rope length to make a difference in interphase insulation. The specific length varies depending on the length of the interphase spacing, but in a normal three-phase installation electric wire (SN-OE 60 square mm wire), for example, the RS phase is about 850 + 20 mm and the ST phase is about 1000 ± 20 mm. Is preferable. In this way, by making the rope length between adjacent phases different (for example, by making the ST phase length longer than the RS phase length), an insulation disparity is provided, and the probability of the occurrence of a three-phase simultaneous short circuit due to a lightning flash etc. Can be reduced.
[0014]
Next, as a manufacturing method of the insulating rope 1,
(A) A method of making a knot ring by cutting a core rope made of aramid fibers such as nylon into a regular size, and impregnating a simple substance such as silicone resin.
(B) Wrap a core rope between the front and rear drums and mechanically and automatically feed it out, let it pass through a single reservoir such as low temperature vulcanized silicone (LTV silicone), impregnate or apply the single body, After that, it is cut into a standard length to make a knot ring, and finally impregnated with a simple substance.
(C) A method in which a core rope is impregnated with a single piece before making a knot ring, and a single piece is impregnated again after making a knot ring.
(D) A method in which a core rope is impregnated with a single piece before making a knot ring, the rope after surface coating is cut into a regular length, and only the end is sealed, and finally a knot ring is made.
(E) A method in which a core rope is impregnated with a single piece before making a knot ring, and then cut into a regular length to form a knot ring, and the single piece is impregnated. Etc.
Note that the method of automatically and continuously impregnating using the drum (b) enables mass production of the insulating rope at a low cost. Also, by impregnating the rope with a single element or sealing the end, the cap effect prevents the entry of the contaminated liquid into the rope, and even when used outdoors for a long period of time, the contaminated liquid penetrates into the interior and is insulated. Can be prevented from deteriorating.
[0015]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
(1) Since an insulated rope is used for the support between the electric wires, it is extremely light and soft compared to a porcelain bar spacer.
As a result, the load on the wire is greatly reduced, and even if it is accidentally dropped from a high place during aerial installation work, it will not be damaged by a drop impact, and it will hit a person walking below. There is no worry of hurting you. Therefore, it is easy to handle during installation.
(2) Because it is a lightweight rope, it does not become a heavy load even if the three phases (R, S, T phases) RS phase and ST phase are connected as one body, R phase, S phase, T phase A knot or the like for attaching to each electric wire can be easily provided.
(3) When an aramid fiber such as nylon is used as an insulating rope, it can have a strong tensile holding force that is inferior to that of a conventional porcelain rod-like spacer, despite its small diameter.
(4) Since conventional porcelain products have to take a structure such as porcelain firing, cement bonding, etc., there was a limit to cost reduction, but the present invention uses low-cost general-purpose products such as nylon ropes. Since it can be used as an insulating rope, if it is used, drastic cost reduction can be realized.
(5) Conventional porcelain products have some ceramic-fired insulators, such as cemented joints with connecting metal joints, so they have intermediate electrodes such as metal fittings in the charging part. Since the invention does not have such an intermediate electrode, the electrical insulation performance has been dramatically improved.
(7) Since the length of the rope becomes the insulation distance, a sufficiently long insulation distance can be easily set, and overinsulation becomes easy. That is, when a short circuit occurs due to a lightning flash between the electric wires, if a sufficient creepage distance (for example, 850 mm) is provided on the insulating rope, the continuity can be interrupted.
[Brief description of the drawings]
FIG. 1 is a front explanatory view of an insulating rope used for supporting between electric wires of the present invention.
FIG. 2 is an explanatory plan view showing an example of a state in which the wires are supported using the insulating rope of the present invention.
FIG. 3 is a perspective view of an essential part showing an example of installation of an insulating rope according to the present invention.
FIG. 4 is an explanatory plan view showing another example of a state in which the electric wires are supported using the insulating rope of the present invention.
FIG. 5 is an explanatory plan view showing still another embodiment in a state where the wires are supported using the insulating rope of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulation rope 2 Steel tower 3a R phase electric wire 3b S phase electric wire 3c T phase electric wire 4 Winding grip

Claims (1)

Between a plurality of parallel overhead wires, an electrically insulating rope is stretched while maintaining a predetermined distance between adjacent wires, and at least the distance in the length direction of the wire between the stretched ropes It is a distance shorter than the distance from the ground to the ground, and it is a support structure between the wires of the overhead wire that prevents the drooping of the wire when the wire is disconnected by the stretched rope ,
The rope is formed by impregnating a core rope made of aramid fiber with an electrically insulating organic monomer.

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