CN203038715U - A slight ice-covered optical fiber composite overhead ground wire capable of melting ice by using self circulation - Google Patents

Abstract

The utility model discloses a low ice-covered optical fiber composite overhead ground wire capable of self-circulation melting ice. In the traditional wire melting method, a large current is applied to the optical fiber composite ground wire to melt the ice. However, due to the high resistance of the aluminum-clad steel wire, the melting current is difficult to meet the requirements, and the melting distance is limited, which reduces the efficiency of the ice melting. The utility model comprises an outer layer of ordinary aluminum-clad steel wire, an inner layer of ordinary aluminum-clad steel wire and a light unit, and is characterized in that at least one thickened aluminum-clad steel wire is twisted into the outer layer of ordinary aluminum-clad steel wire to form a partial surface The sparse raised structure, the inner ordinary aluminum-clad steel wire is twisted into a strand of insulated wire. The utility model ensures the function of the original optical fiber composite overhead ground wire; can implement high current melting ice in the optical fiber composite ground wire; significantly improves the anti-icing ability of the ground wire and prolongs the service life.

Description

A low-icing optical fiber composite overhead ground wire capable of self-circulation melting

technical field

The utility model belongs to the technical field of electric power engineering equipment, and relates to an overhead ground wire of a power line with optical communication, in particular to a low-ice-coated optical fiber composite overhead ground wire capable of self-circulation melting ice.

Background technique

The optical fiber composite ground wire does not pass the load current during normal operation, so the phenomenon of icing is more serious than that of the transmission wire in winter, which seriously affects the life of the line. After the ground wire is covered with ice, it is easy to cause accidents such as disconnection, tower collapse, and insulator flashover, which will affect normal power transmission and power communication. In the traditional wire melting method, a large current is applied to the optical fiber composite ground wire to melt the ice. However, due to the high resistance of the aluminum-clad steel wire, the melting current is difficult to meet the requirements, and the melting distance is limited, which reduces the efficiency of the ice melting.

Contents of the invention

The technical problem to be solved by the utility model is to provide a low-ice-coated optical fiber composite overhead ground wire that can realize self-circulation and ice melting in order to improve The anti-icing ability of the optical fiber composite overhead ground wire can meet the needs of ground wire melting without stopping the line on site.

For this reason, the technical solution adopted by the utility model is: a kind of low-ice-coated optical fiber composite overhead ground wire that can self-circulate and melt ice, including an outer twisted layer, an inner twisted layer and an optical unit, and the outer twisted layer is composed of multiple strands The outer layer is composed of ordinary aluminum-clad steel wires distributed in the circumferential direction, and the inner layer is composed of multiple ordinary aluminum-clad steel wires distributed in the circumferential direction. It is characterized in that the outer layer is twisted into At least one thickened aluminum-clad steel wire forms a sparse raised structure on the local surface, and a strand of insulated wire is twisted into the inner twisted layer.

Further, the insulated wire is located at any position in the inner twisted layer, and the insulated wire is a copper wire with an insulating layer wrapped on the surface; the number of the thickened aluminum-clad steel wires is more than two; the light Units are twisted into the inner stranded layer and located anywhere in the inner stranded layer. The wire diameter of the thickened aluminum-clad steel wire is significantly larger than that of the inner and outer ordinary aluminum-clad steel wires of the same material, and the wire diameters of the inner and outer ordinary aluminum-clad steel wires are ordinary wire diameters.

The working principle of the utility model is: use the good mechanical strength and toughness of the aluminum-clad steel wire to support the gravity of the overhead ground wire, and also have the lightning protection function of the overhead ground wire to ensure the normal and safe operation of the transmission line. The thickened aluminum-clad steel wire is added to the outer ordinary aluminum-clad steel wire to form a sparse raised structure on the outer surface, which improves the surface flow field to divert rainwater and effectively reduces the phenomenon of water hanging on the surface of the ground wire. The insulated wire is a copper wire wrapped with an insulating layer on the surface. Taking advantage of its good cold resistance, low self-resistance and good thermal conductivity, it can realize the introduction of DC current in the overhead ground wire and realize the ice melting of the optical fiber composite overhead ground wire; The insulated wire can be connected in series with the outer ordinary aluminum-clad steel wire or the thickened aluminum-clad steel wire to realize a self-circulating ice-melting circuit. The optical unit is used for signal transmission to ensure the information communication function of the ground wire at the same time.

The utility model has the beneficial effects: (1) It can maintain the function of the ground wire without affecting the safety of the line; (2) It can form a self-circulating ice-melting circuit through the ground wire itself, and the line will not stop when the ice is melted. (3) The anti-icing ability of the optical fiber composite overhead ground wire is improved; (4) The insulated wire can withstand a certain amplitude of high voltage, and through a large current, the speed of ice melting is improved; (5) It can protect the optical fiber The normal communication function of the composite overhead ground wire.

Description of drawings

Figure 1 is a schematic cross-sectional structure diagram of the utility model, marked as: 1-outer ordinary aluminum-clad steel wire, 2-thickened aluminum-clad steel wire, 3-insulated wire, 4-optical unit, 5-inner layer common Aluminum clad steel wire, 6-center aluminum clad steel wire.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments of the specification.

As shown in Figure 1, the self-circulating low-ice-coated optical fiber composite overhead ground wire consists of 9 ordinary aluminum-clad steel wires in the outer layer 1, 4 ordinary aluminum-clad steel wires in the inner layer 5, and two thickened aluminum-clad steel wires. Wire 2, an insulated wire 3, an optical unit 4, and a central aluminum-clad steel wire 6 located at the center of the ground wire are stranded, and 9 outer layers of ordinary aluminum-clad steel wires 1 are distributed in a circumferential direction. Stranded layer, 4 ordinary aluminum-clad steel wires in the inner layer distributed in the circumferential direction form the inner layer, the diameter of the central aluminum-clad steel wire is the same as that of the inner and outer ordinary aluminum-clad steel wires, and the inner layer is twisted in the outer layer Combine two strands of thickened aluminum-clad steel wire 2, the wire diameter of the thickened aluminum-clad steel wire is 1-2 times the diameter of the ordinary aluminum-clad steel wire of the inner and outer layers, and a sparse raised structure is formed on the outer surface. The insulated wire 3 and the optical unit 4 are stranded in the inner stranded layer. The insulated wire 3 and the optical unit 4 can be located anywhere in the inner twisted layer, and the optical unit is an optical fiber. The thickness of the insulating layer of the insulated conductor 3 is required to withstand a DC voltage of up to 10kV, and the calculation formula for the cross-sectional area of the conductor is:

；

;

In the formula, S —the cross-sectional area of the wire, mm ² ;

I — the maximum current through the wire, A;

ρ —resistivity of copper,;

ΔU—voltage drop, V;

L - the length of the wire.

The wire diameter of the insulated wire is determined by the above formula according to the maximum ice-melting current required by the ground wire, the ice-melting distance and a certain safety margin.

The above-mentioned self-circulating low-icing optical fiber composite overhead ground wire has a good anti-icing ability, prolongs the service life of the optical fiber composite ground wire, and meets the design requirements of self-circulation ice melting. The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the structure of the present utility model in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model all fall within the protection scope of the present utility model.

Claims (5)

1. A low-ice-coated optical fiber composite overhead ground wire capable of self-circulating ice melting, including an outer twisted layer, an inner twisted layer and an optical unit (4), and the outer twisted layer is composed of a plurality of outer layers distributed in a circumferential direction Composed of ordinary aluminum-clad steel wires (1), the inner twisted layer is composed of a plurality of ordinary aluminum-clad steel wires (5) distributed in the circumferential direction, characterized in that the outer twisted layer is twisted into at least A thickened aluminum-clad steel wire (2) forms a sparse raised structure on the local surface, and an insulated wire (3) is twisted into the inner twisted layer. 2. The self-circulating ice-melting low-icing optical fiber composite overhead ground wire according to claim 1, characterized in that the insulated wire (3) is located at any position in the inner twisted layer. 3. The self-circulating ice-melting low-icing optical fiber composite overhead ground wire according to claim 2, characterized in that the insulated wire is a copper wire with an insulating layer on its surface. 4. The self-circulating ice-melting low-icing optical fiber composite overhead ground wire according to claim 1 or 2, characterized in that the number of thickened aluminum-clad steel wires (2) is more than two. 5. The self-circulating ice-melting low-ice-coated optical fiber composite overhead ground wire according to claim 1 or 2, characterized in that the optical unit (4) is twisted into the inner stranded layer, and the any position.

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