Horizontal optical fiber composite overhead ground wire with high lightning stroke resistance

Abstract

The utility model relates to a horizontal optical fiber composite overhead ground wire with high lightning stroke resistance. The horizontal optical fiber composite overhead ground wire comprises optical fiber units, an armor layer and a lightning protection layer, the optical fiber unit is arranged in the center of the composite cable, the armor layer is twisted outside the optical fiber unit, and the lightning protection layer wraps the armor layer; the optical fiber unit comprises a loose tube, optical fibers and fiber paste which are positioned in the loose tube, and a protective layer positioned outside the loose tube; the protective layer is of an integral tubular structure, tightly wraps the loose tube, plays a role in heat insulation and protection and comprises a base body and reinforcing fibers located in the base body. The armor layer is made of a carbon fiber composite material, is high in strength and light in weight, and mainly bears tensile resistance of the composite cable; the lightning protection layer adopts an aluminum alloy pipe structure and mainly bears lightning stroke short-circuit current, and due to the adoption of the whole aluminum alloy pipe structure, the problem of strand breakage during lightning stroke can be avoided, and the lightning stroke resistance level of the composite cable is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical fiber composite cable especially to a horizontal high lightning-resistant optical fiber composite overhead ground wire. BACKGROUND

[0002] In the intelligent construction of medium and high voltage transmission line, optical fiber composite overhead ground wire (OPGW) is widely used. But in the thunderstorm area, such as Guangdong and Zhejiang, OPGW is often damaged due to lightning, and in severe cases, it will cause partial melting of OPGW, breakage of outer monofilament, and short circuit of the monofilament after breakage. Lightning trip has been a difficult problem for safe power supply, and lightning cannot be eliminated, only the adverse consequences caused by lightning can be alleviated. If lightning does not cause OPGW breakage, it will greatly reduce the impact of lightning on the safety of the line.

[0003] In view of the above, a new OPGW structure is needed to solve the above problems. By improving the conventional OPGW structure, an overall structure is designed for the outermost layer of OPGW, which will greatly improve the lightning resistance level of OPGW. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the shortcomings of the prior art, and provides an OPGW optical cable with high lightning resistance, which adds a lightning protection layer to the conventional OPGW structure. The lightning protection layer adopts an aluminum alloy pipe structure and is integrally coated on the outside of the optical cable, has high strength and good conductivity. When a large current is generated by lightning, the lightning current can be introduced into the ground in a very short time, reducing the impact of lightning on the optical cable and avoiding the melting caused by high temperature due to lightning current, so that the breakage of the cable is avoided, ensuring the safe operation of the transmission line during lightning. The optical unit of the utility model is non-metallic and contains a high-temperature-resistant protective layer, which can isolate the high temperature generated by lightning from affecting the optical fiber and prevent the optical fiber from being damaged and the communication from being interrupted. The armor layer of the utility model is made of carbon fiber, which has high tensile strength and light weight, and mainly bears the tensile force of the composite cable, so that the whole optical cable has good tensile performance and light weight.

[0005] According to the technical scheme provided by the utility model, the OPGW with high lightning resistance comprises an optical fiber unit, an armor layer and a lightning protection layer. The optical fiber unit is located at the center of the composite cable, the armor layer is twisted outside the optical fiber unit, and the lightning protection layer is coated outside the armor layer.

[0006] The optical fiber unit comprises a loose tube, an optical fiber and a fiber paste located in the loose tube, and a protective layer located outside the loose tube.

[0007] The protective layer is an integral tubular structure and is tightly coated outside the loose tube. The protective layer comprises a base body and reinforcing fibers located in the base body.

[0008] As preferred, the armor layer material is carbon fiber, and the number of armor layer is 1-2 layers.

[0009] As preferred, the lightning protection layer material is aluminum alloy, and the whole aluminum alloy pipe structure.

[0010] As preferred, the material of the base is high-temperature-resistant epoxy resin, and the material of the reinforcing fiber is glass fiber.

[0011] As preferred, the optical fiber unit (12) comprises at least one composite arrangement of sensing optical fiber and communication optical fiber, the surface of the sensing optical fiber is coated with a polyimide temperature measuring layer, and the temperature resolution of the sensing optical fiber reaches ±0.5℃.

[0012] As preferred, a conductive buffer layer is arranged between the armor layer (2) and the lightning protection layer (3), the buffer layer is composed of a silicone rubber base and a carbon nanotube filler, and the thickness is controlled in the range of 0.3-0.8mm.

[0013] In summary, the utility model has at least one of the following beneficial technical effects:

[0014] 1. The lightning protection layer is added to the conventional OPGW structure, the lightning protection layer adopts an aluminum alloy pipe structure, is integrally coated outside the optical cable, has high strength and good conductivity, can guide the lightning current into the ground in a very short time when a large current is generated by lightning, reduces the influence of lightning on the optical cable, avoids the melting caused by high temperature generated by lightning current, does not appear the situation of broken strand and broken cable, ensures the safe operation of the power transmission line in the lightning, and the optical cable has high lightning resistance level.

[0015] 2. The optical unit is non-metallic and contains a high-temperature-resistant protective layer, which can isolate the influence of high temperature generated by lightning on the optical fiber when lightning occurs, prevent the optical fiber from being damaged, and interrupt communication, and the optical cable has a longer service life.

[0016] 3. The armor layer adopts carbon fiber, has large tensile strength and light weight, mainly bears the tensile force of the composite cable, makes the whole optical cable have good tensile performance, and has light weight. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of a horizontal high lightning-resistant optical fiber composite overhead ground wire.

[0018] Mark explanation: 1, optical fiber unit;11, loose tube;12, optical fiber;13, fiber paste;14, protective layer;141, base;142, reinforcing fiber;2, armor layer;3, lightning protection layer. DETAILED DESCRIPTION

[0019] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0021] In addition, "several" means at least two, such as two, three, etc., unless otherwise specifically limited.

[0022] The embodiments of the present application disclose a horizontal high lightning-resistant optical fiber composite overhead ground wire. Figure 1 The embodiments of the present application will be further described below in conjunction with specific embodiments.

[0023] The horizontal high lightning-resistant optical fiber composite overhead ground wire of the present application comprises an optical fiber unit 1, an armored layer 2 and a lightning protection layer 3, the optical fiber unit 1 is at the center of the composite cable, the armored layer 2 is twisted outside the optical fiber unit 1, the lightning protection layer 3 is coated outside the armored layer 2, the optical fiber unit 1 comprises a loose tube 11, optical fibers 12 and fiber paste 13 inside the loose tube 11, and a protective layer 14 outside the loose tube; the loose tube 11 contains 12 optical fibers 12 of G652D type, the protective layer 14 is an integral tubular structure, tightly coated outside the loose tube 11, the protective layer 14 comprises a base body 141 and reinforcing fibers 142 inside the base body 141, the armored layer 2 is made of carbon fibers, the number of layers of the armored layer is 2, the first layer has 6 carbon fiber rods, the second layer has 12 carbon fiber rods, the lightning protection layer 3 is made of an aluminum alloy pipe, the advantage of this design is that the lightning protection layer 3 adopts an aluminum alloy pipe structure, which is integrally coated outside the optical cable, has high strength and good conductivity, when a large current is generated by lightning strike, the lightning current can be introduced into the ground in a very short time, reducing the influence of lightning strike on the optical cable, avoiding the high temperature caused by lightning current, and avoiding the situation of broken strands and cables, ensuring the safe operation of the transmission line during lightning strike, and the optical cable has high lightning-resistant level.

[0024] The optical fiber 12 comprises at least one sensing optical fiber and a communication optical fiber arranged in combination, the sensing optical fiber is coated with a polyimide temperature measuring layer, the temperature resolution of the sensing optical fiber reaches ±0.5℃, a conductive buffer layer is arranged between the armor layer 2 and the lightning protection layer 3, the buffer layer is composed of a silicone rubber matrix and a carbon nanotube filler, the thickness is controlled in the range of 0.3-0.8mm, through the design, the polyimide material has excellent high-temperature resistance characteristics, the long-term applicable temperature range is-200℃ to 300℃, can adapt to extreme temperature fluctuations in the power transmission scene, ensures the stability and reliability of the sensing optical fiber in the high-temperature environment, the linear expansion coefficients of the carbon fiber and the aluminum alloy are quite different, the elastic modulus of the silicone rubber matrix can effectively absorb the stress generated due to temperature changes or mechanical loads, avoids delamination or fracture caused by thermal expansion and cold shrinkage between layers, and improves the durability of the overall structure.

[0025] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A horizontal high lightning resistant fiber optic composite overhead ground wire characterized by: It includes optical fiber unit (1), armored layer (2) and lightning protection layer (3); the optical fiber unit (1) is in the center of the composite cable, the armored layer (2) is twisted outside the optical fiber unit (1), and the lightning protection layer (3) is coated outside the armored layer (2); The optical fiber unit (1) includes a loose tube (11), optical fibers (12) and fiber paste (13) in the loose tube, and a protective layer (14) outside the loose tube; The protective layer (14) is a whole tubular structure, tightly coated outside the loose tube (11), and includes a base body (141) and reinforcing fibers (142) in the base body (141).

2. A horizontal high lightning resistant optical fiber composite overhead ground wire according to claim 1, characterized in that: The armored layer (2) is made of carbon fiber material, and the number of layers is 1-2.

3. A horizontal high lightning resistant fiber optic composite overhead ground wire as claimed in claim 1, characterized in that: The lightning protection layer (3) is made of aluminum alloy, and is a whole aluminum alloy pipe structure.

4. A horizontal high lightning resistant optical fiber composite overhead ground wire according to claim 1, characterized in that: The base body (141) is made of high-temperature resistant epoxy resin, and the reinforcing fibers (142) are made of glass fiber.

5. A horizontal high lightning resistant optical fiber composite overhead ground wire according to claim 1, characterized in that: The optical fibers (12) include at least one sensing optical fiber and a communication optical fiber arranged in combination, the surface of the sensing optical fiber is coated with a polyimide temperature measuring layer, and the temperature resolution of the sensing optical fiber reaches ±0.5℃.

6. A horizontal high lightning resistant optical fiber composite overhead ground wire according to claim 1, characterized by: A conductive buffer layer is arranged between the armored layer (2) and the lightning protection layer (3), the buffer layer is composed of a silicone rubber base body and a carbon nanotube filler, and the thickness is controlled in the range of 0.3-0.8mm.

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