Electric potential processing equipment for photoelectric composite high voltage cable optical fiber reinforced core, etc.

Abstract

The present invention relates to a potential treatment equipment for an optical fiber reinforced core of an optoelectronic composite high-voltage cable, which includes, from the outer layer to the inner layer, a cable outer sheath, an aluminum sheath, an outer semiconductive layer, a main insulation, and a cable conductor, the cable outer sheath, the aluminum sheath, the outer semiconductive layer, the main insulation, and the cable conductor are arranged in a step-type structure, a temperature measuring optical fiber reinforced core is connected to the aluminum sheath, an optical fiber connection box is fixedly arranged on the outer wall of the cable outer sheath, a temperature measuring optical fiber is arranged in the temperature measuring optical fiber reinforced core, and the other end of the temperature measuring optical fiber is connected to the optical fiber connection box, which prevents the formation of a ground loop due to the temperature measuring optical fiber reinforced core, and further prevents heat damage to the temperature measuring optical fiber and damage to the main insulation.

Description

[Technical field]

[0001] The present invention relates to potential processing equipment such as optical fiber reinforced core of photoelectric composite high voltage cable, and to the technical field of power equipment. [Background technology]

[0002] In a power transmission system consisting of a single-core cable, the relationship between the cable conductor and the sheath can be regarded as an air-core transformer. When an alternating current flows through a single-core cable core, an alternating magnetic field is always generated around the alternating current, and an induced electromotive force is generated in the metal sheath. However, for single-core cables, the existence of induced voltages will cause circulating currents if a double-ended grounding method is adopted, so single-core cables should not be grounded at both ends. However, if one end of the metal sheath is not grounded, a high induced overvoltage will be generated at the ungrounded end of the cable sheath in the event of a lightning strike or short circuit fault, and this voltage will act on the outer sheath insulation. If the cable outer insulation cannot withstand the action of such overvoltages and is damaged, multi-point grounding will occur and circulating currents will be formed.

[0003] In the prior art, the cable end worker pulls out the reinforcement core together with the optical fiber from the tailpipe, and fixes the reinforcement core inside or outside the optical fiber welding box, where the reinforcement core is made of aluminum magnesium alloy material, and the protective layer semiconductive is made of PE material, which is easy to break. When the broken reinforcement core contacts the aluminum sheath or the tailpipe, the reinforcement core will be equipotentially connected to the tailpipe, and the same induced voltage will be generated. The optical fiber reinforcement core is fixed to the steel support, and the steel support is all directly grounded. When the broken reinforcement core contacts the steel support and conducts, the aluminum sheath is two-point grounded through the optical fiber reinforcement core and the grounding wire in the direct grounding box, and the reinforcement core becomes the circulation path of the ground circulating current, which generates a large circulating current, which causes the heating and burning of the reinforcement core, which seriously causes the main insulation of the burned cable, and causes the cable destruction accident. This type of fault has occurred many times in China. Therefore, it is very significant to design an equipment that can avoid the formation of ground circulating current caused by the optical fiber reinforcement core, and thus the heating damage and main insulation damage of the optical fiber. Summary of the Invention [Means for solving the problem]

[0004] In order to solve the above problems in the prior art, the present invention provides a potential processing device such as an optical fiber reinforced core of an optoelectronic composite high-voltage cable, which can prevent the formation of a ground loop in the temperature measuring optical fiber reinforced core, and further prevent the heat damage and main insulation damage of the temperature measuring optical fiber.

[0005] The technical means of this invention are as follows: The potential treatment equipment includes, from the outer layer to the inner layer, a cable outer sheath, an aluminum sheath, an outer semiconductive layer, a main insulation, and a cable conductor, the cable outer sheath, the aluminum sheath, the outer semiconductive layer, the main insulation, and the cable conductor being arranged in a step-type structure, a temperature measuring optical fiber reinforced core is connected to the aluminum sheath, an optical fiber connection box is fixedly arranged on the outer wall of the cable outer sheath, a temperature measuring optical fiber is arranged in the temperature measuring optical fiber reinforced core, and the other end of the temperature measuring optical fiber is connected to the optical fiber connection box.

[0006] Here, the temperature measuring optical fibers are arranged in pairs, and are arranged so as to be symmetrical and adjacent to each other.

[0007] Here, a reinforcing core protection layer is disposed on the outer layer of the temperature measuring optical fiber.

[0008] Here, one end of the temperature measuring optical fiber reinforcing core is welded to the cross section of the aluminum sheath, and the other end is welded to the outer wall of the aluminum sheath. Effect of the Invention

[0009] The present invention has the following advantages over the prior art: by welding the temperature measuring optical fiber reinforced core to the aluminum sheath, and then pulling out the temperature measuring optical fiber and connecting it to the optical fiber connection box, the temperature measuring optical fiber reinforced core does not need to be pulled out through the tail pipe, which avoids the formation of a ground loop caused by the temperature measuring optical fiber reinforced core, and further avoids heat damage and main insulation damage to the temperature measuring optical fiber. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is an overall structural diagram of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of part A in FIG. 1 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention will be described in detail below with reference to the embodiments shown in the drawings.

[0012] Please refer to Figure 1. The technical means provided by this invention are as follows: This is potential processing equipment for an optical fiber reinforced core of a photoelectric composite high-voltage cable, and includes, from the outer layer to the inner layer, a cable outer sheath 1, an aluminum sheath 2, an outer semiconducting layer 4, a main insulation 4, and a cable conductor 5. A temperature measuring optical fiber reinforced core 6 is connected to the aluminum sheath 2. An optical fiber connection box 9 is fixedly disposed on the outer wall of the cable outer sheath 1. A temperature measuring optical fiber 7 is disposed in the temperature measuring optical fiber reinforced core 6. The other end of the temperature measuring optical fiber 7 is connected to the optical fiber connection box 9.

[0013] Further, the temperature measuring optical fibers 7 are arranged in pairs and are arranged symmetrically adjacent to each other.

[0014] Furthermore, a reinforcing core protection layer is disposed on the outer layer of the temperature measuring optical fiber 7 .

[0015] Furthermore, one end of the temperature measuring optical fiber reinforcing core 6 is welded to the cross section of the aluminum sheath, and the other end is welded to the outer wall of the aluminum sheath 2 .

[0016] The embodiment of the working principle is as follows: The temperature-measuring optical fiber reinforced core 6 is welded to the cross section of the aluminum sheath 2 and welded to the aluminum sheath 2, so that the temperature-measuring optical fiber reinforced core 6, the aluminum sheath 2 and the tailpipe are connected to an equipotential connection. The temperature-measuring optical fiber reinforced core 6 does not need to be pulled out through the tailpipe, which avoids the formation of a ground loop caused by the temperature-measuring optical fiber reinforced core 6, and further avoids heat damage to the temperature-measuring optical fiber 7 and damage to the main insulation 4. This avoids the destruction of the integrity of the tailpipe due to the opening of the tailpipe, and reduces the moisture problem at the cable end caused by the opening causing poor sealing.

[0017] The coating material of the cable outer sheath 1 is 0.95 g / cm 3 It is a high density polyphthalene having a density of 5.0 mm or more. The nominal thickness is 5.0 mm, and the thickness at the thinnest point is 95% or more of the nominal thickness. A uniform, firm and completely continuous conductive layer is applied to the surface of the non-metallic protective layer, and an extruded conductive layer is preferred.

[0018] The outer wall of the aluminum sheath 2 has ripples, which are spiral-shaped. On the surface of the aluminum sheath 2, the hafnium is coated with cable asphalt anticorrosion coating. Between the aluminum sheath 2 and the insulating shield, it is necessary to wind an expansion band of the semiconductor resistor, which ensures a good electrical connection between the two and longitudinal waterproofing.

[0019] The outer semiconductive layer 3 is an insulating shield, which uses an ultra-smooth crosslinkable semiconductive material manufactured by Dow, USA. The extruded semiconductive layer is uniformly coated on the surface of the insulation, and the nominal thickness of the extruded insulating shield is 1.0 mm.

[0020] The insulating material of the main insulation 4 is made of ultra-refined cross-linked polyethylene material manufactured by Nordic or Dow of the United States (or Japan). The nominal thickness of the insulation is 24 mm or more.

[0021] The cable conductor 5 is made of oxygen-free copper, and for cables over 1000 mm2, split conductors are used.

[0022] The above is merely an embodiment of the present invention, and does not limit the scope of the claims of the present invention. Any equivalent structure or equivalent flow transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly used in other related technical fields, is included in the scope of the claims of the present invention. [Explanation of symbols]

[0023] 1, cable outer sheath; 2, aluminum sheath; 3, outer semi-conductive layer; 4, main insulation; 5, cable conductor; 6, temperature measurement optical fiber reinforcing core; 7, temperature measurement optical fiber; 8, reinforcing core protection layer; 9, optical fiber connection box.

Claims

1. 1. An electric potential processing equipment for an optical fiber reinforced core of an optical-electrical composite high-voltage cable, comprising, in order from the outer layer to the inner layer, a cable outer sheath (1), an aluminum sheath (2), an outer semiconductive layer (3), a main insulation (4), and a cable conductor (5), the cable outer sheath (1), the aluminum sheath (2), the outer semiconductive layer (3), the main insulation (4), and the cable conductor (5) being arranged to present a step-type structure, a temperature measuring optical fiber reinforced core (6) is connected to the aluminum sheath (2), an optical fiber connection box (9) is fixedly arranged on the outer wall of the cable outer sheath (1), a temperature measuring optical fiber (7) is arranged in the temperature measuring optical fiber reinforced core (6), and the other end of the temperature measuring optical fiber (7) is connected to the optical fiber connection box (9).

2. The electric potential processing equipment of the optical fiber reinforced core of the photoelectric composite high voltage cable according to claim 1, characterized in that the temperature measuring optical fiber (7) is arranged in a pair and is arranged symmetrically adjacent to each other.

3. 2. The electric potential treatment equipment for an optical fiber reinforcement core of an optical-electrical composite high-voltage cable according to claim 1, further comprising a reinforcement core protection layer (8) disposed on the outer layer of the temperature measuring optical fiber (7).

4. 2. The electric potential treatment equipment of claim 1, wherein one end of the temperature measuring optical fiber reinforced core (6) is welded to the cross section of the aluminum sheath (2), and the other end is welded to the outer wall of the aluminum sheath (2).

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