CN219066493U - A photoelectric composite high-voltage cable fiber reinforced core equipotential treatment equipment - Google Patents

Abstract

The utility model relates to an equipotential treatment device for an optical fiber reinforced core of a photoelectric composite high-voltage cable. The outer sheath, the aluminum sheath, the outer semiconducting layer, the main insulation and the cable conductor are arranged in a stepped structure, the aluminum sheath is connected with a temperature-measuring optical fiber reinforcing core, and the outer wall of the cable outer sheath is fixedly arranged with Optical fiber connection box; the temperature measuring fiber reinforced core is provided with a temperature measuring optical fiber, and the other end of the temperature measuring fiber is connected to the fiber connecting box; it can avoid the formation of grounding circulation through the temperature measuring fiber reinforced core, thereby avoiding the The problem of thermal damage to the temperature measuring optical fiber and damage to the main insulation.

Description

A photoelectric composite high-voltage cable fiber reinforced core equipotential treatment equipment

technical field

The utility model relates to an equipotential treatment device for an optical fiber reinforced core of a photoelectric composite high-voltage cable, which belongs to the technical field of electric power equipment.

Background technique

In the power transmission system composed of single-core power cables, the relationship between the cable conductor and the sheath can be regarded as a hollow transformer. When an alternating current flows through the core of a single-core cable, an alternating magnetic field will inevitably be generated around the alternating current, and an induced electromotive force will be generated on the metal sheath. But for a single-core cable, due to the existence of induced voltage, if the grounding method is used at both ends, there will be a circulating current, so the single-core cable should not be grounded at both ends. However, when one end of the metal sheath is not grounded, a high induced overvoltage will be generated at the ungrounded end of the cable sheath during a lightning strike or a short-circuit fault, and this voltage acts on the insulation of the outer sheath. When the insulation of the outer sheath of the cable cannot bear the effect of this overvoltage and is damaged, multi-point grounding will occur, forming a circulating current.

In the prior art, the construction personnel of the cable terminal lead out the strengthening core together with the optical fiber from the tail pipe, and fix the strengthening core inside or outside the optical fiber fusion splice box. The strengthening core is made of aluminum magnesium silicon alloy material, and the protective layer is made of semi-conductive PE material. fragile. If the damaged reinforcement core is in contact with the aluminum sheath or the tail pipe, the reinforcement core will form an equipotential connection with the tail pipe, generating the same induced voltage. The fiber reinforced core is fixed on the steel bracket, and the steel bracket is directly grounded. If the damaged reinforced core is in contact with the steel bracket, the aluminum sheath forms a two-point ground through the fiber reinforced core and the grounding wire in the direct grounding box. , the reinforcing core becomes the path of grounding circulation, which will generate a large circulating current, which will cause the reinforcing core to heat up or even burn out, seriously burn the main insulation of the cable, and cause cable breakdown accidents. This type of fault has occurred many times in China . Therefore, it is very meaningful to design equipment that can avoid the formation of ground loop current through the fiber reinforced core, which will cause heat damage to the fiber and damage to the main insulation.

Utility model content

In order to solve the above-mentioned problems in the prior art, the utility model provides an equipotential treatment device for the optical fiber reinforced core of a photoelectric composite high-voltage cable, which can avoid the formation of grounding circulation through the temperature-measuring optical fiber reinforced core, thereby avoiding the heat damage of the optical fiber , The problem of damage to the main insulation.

The technical scheme of the utility model is as follows:

A photoelectric composite high-voltage cable fiber reinforced core equipotential treatment equipment, which includes a cable outer sheath, an aluminum sheath, an outer semiconducting layer, a main insulation, and a cable conductor from the outer layer to the inner layer. The cable outer sheath, The aluminum sheath, the outer semiconducting layer, the main insulation and the cable conductor are arranged in a stepped structure, the aluminum sheath is connected with a temperature-measuring optical fiber reinforcement core, and the outer wall of the cable outer sheath is fixed with an optical fiber connection box ; The temperature-measuring fiber reinforced core is provided with a temperature-measuring fiber, and the other end of the temperature-measuring fiber is connected to the fiber splicing box.

Wherein, a pair of the temperature measuring optical fibers are provided and are symmetrically attached to each other.

Wherein, the outer layer of the temperature measuring optical fiber is provided with a strengthening core protection layer.

Wherein, one end of the temperature-measuring optical fiber reinforced core is welded to the fracture of the aluminum sheath, and the other end is welded to the outer wall of the aluminum sheath.

The utility model has the following beneficial effects:

By welding the temperature-measuring fiber reinforced core to the aluminum sheath and connecting the temperature-measuring fiber to the fiber optic connection box, the temperature-measuring fiber reinforced core does not need to be led out through the tail pipe, avoiding the formation of the temperature-measuring fiber reinforced core Ground circulation, thereby avoiding heat damage to the temperature measuring optical fiber and damage to the main insulation.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model;

Fig. 2 is a sectional view of part A in Fig. 1 of the present utility model.

The reference signs in the figure represent:

1. Cable outer sheath; 2. Aluminum sheath; 3. Outer semi-conductive layer; 4. Main insulation; 5. Cable conductor; 6. Temperature measuring fiber reinforced core; 7. Temperature measuring fiber; 8. Strengthening core protection layer ; 9. Optical fiber connection box.

Detailed ways

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

Please refer to Figure 1, the utility model provides a technical solution:

A photoelectric composite high-voltage cable fiber reinforced core equipotential treatment equipment, which has a stepped structure from the outer layer to the inner layer, including a cable outer sheath 1, an aluminum sheath 2, an outer semiconducting layer 3, a main insulation 4 and a cable conductor 5. The aluminum sheath 2 is connected with a temperature-measuring optical fiber reinforcing core 6, and the outer wall of the cable outer sheath 1 is fixed with an optical fiber connection box 9; 7. The other end is connected to the fiber optic splice box 9.

Further, a pair of temperature-measuring optical fibers 7 are provided and are symmetrically attached to each other.

Further, the outer layer of the temperature measuring optical fiber 7 is provided with a strengthening core protective layer 8 .

Further, one end of the temperature-measuring optical fiber reinforcing core 6 is welded to the fracture of the aluminum sheath 2 , and the other end is welded to the outer wall of the aluminum sheath 2 .

Working principle example:

The temperature-measuring fiber reinforced core 6 is welded at the fracture of the aluminum sheath 2, and welded to the aluminum sheath 2. The fiber reinforced core 6 is equipotentially connected to the aluminum sheath 2 and the tail pipe, and the temperature-measuring fiber reinforced core 6 is not used. Leading out through the tail pipe avoids the formation of grounding circulation through the temperature-measuring fiber reinforced core 6, thereby avoiding heat damage to the temperature-measuring fiber 7 and damage to the main insulation 4, avoiding the opening of the tail pipe and destroying the integrity of the tail pipe, reducing the The opening of the hole leads to the problem of moisture in the cable terminal caused by poor sealing.

The sheath material of cable outer sheath 1 is □ density polyethylene, and its density is not less than 0.95g/cm3. The nominal thickness is 5.0mm, and the thickness of the thinnest point is not less than 95% of its nominal thickness. □□Belongs to the sheath surface □There is □a uniform, firm and continuous conductive layer, and □extruded conductive layer is preferred.

The outer wall of the aluminum sheath 2 has corrugations, and the corrugations are spiral. Aluminum sheath 2 table □ has cable bitumen anti-corrosion coating. Between the aluminum sheath 2 and the insulating shield must be wrapped with semiconductive resistance □expansion tape to ensure good electrical □connection and longitudinal resistance □ between them.

The outer semiconductive layer 3 is an insulating shield, made of □ceramic□ultra-smooth cross-linkable semiconductive material. The extruded semi-conductive layer is evenly covered on the insulating surface, and the nominal thickness of the extruded insulating shield is 1.0mm.

The insulation material of the main insulation 4 is made of □Nordicization□ or American (or □Ben) pottery □ultra-clean cross-linked poly□ene material. The nominal thickness of the insulation is not less than 24mm.

Cable conductor 5 adopts □□ oxygen copper, and □split conductor is used for 1000mm2 and above.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion made by using the utility model specification and accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (4)

1. The utility model provides a photoelectric composite high tension cable optic fibre strengthens core equipotential treatment facility which characterized in that: the cable comprises a cable outer sheath (1), an aluminum sheath (2), an outer semiconductive layer (3), a main insulation (4) and a cable conductor (5) from an outer layer to an inner layer, wherein the cable outer sheath (1), the aluminum sheath (2), the outer semiconductive layer (3), the main insulation (4) and the cable conductor (5) are arranged in a ladder-shaped structure, a temperature measuring optical fiber reinforcing core (6) is connected to the aluminum sheath (2), and an optical fiber splicing box (9) is fixedly arranged on the outer side wall of the cable outer sheath (1); the temperature measuring optical fiber reinforcing core (6) is internally provided with a temperature measuring optical fiber (7), and the other end of the temperature measuring optical fiber (7) is connected to the optical fiber splicing box (9).

2. The equipotential processing device for an optical fiber reinforced core of an optical-electrical composite high-voltage cable according to claim 1, wherein: the temperature measuring optical fibers (7) are provided with a pair of optical fibers which are closely and symmetrically attached to each other.

3. The equipotential processing device for an optical fiber reinforced core of an optical-electrical composite high-voltage cable according to claim 1, wherein: the outer layer of the temperature measuring optical fiber (7) is provided with a reinforced core protection layer (8).

4. The equipotential processing device for an optical fiber reinforced core of an optical-electrical composite high-voltage cable according to claim 1, wherein: one end of the temperature measuring optical fiber reinforced core (6) is welded at the fracture of the aluminum sheath (2), and the other end is welded on the outer side wall of the aluminum sheath (2).

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