CN203118653U - 6 to 35kV water tree resistant XLPE (Cross Linked Polyethylene) insulating power cable - Google Patents

Abstract

The utility model relates to a 6 to 35kV water tree resistant XLPE insulating power cable, which comprises conductor cores. When the cable is of a single-core structure, the conductor core is successively wrapped in a conductor shielding layer, a water tree resistant XLPE insulation layer, an insulation shielding layer, a metal shielding layer, a comprehensive waterproof layer, an armor layer and an oversheath layer; and when the cable employs a three-core structure, each conductor core is successively wrapped in a conductor shielding layer, a water tree resistant XLPE insulation layer, an insulation shielding layer and a metal shielding layer to form a single cable body, fillers are filled between the cable bodies, and the cable bodies are successively wrapped in a comprehensive waterproof layer, an armor layer and an oversheath layer. When a waterproof structure of the cable is damaged and loses effectiveness due to aging or outside force, cable insulation can be still ensured and excellent electrical performance of the cable can be maintained due to the fact that insulation materials of the cable are capable of resisting water trees, thereby ensuring safe and reliable operation of power lines, and prolonging service life of the cable.

Description

6～35kV waterproof tree XLPE insulated power cable

technical field

The utility model relates to the field of cables and cables, in particular to a 6-35 kV waterproof tree cross-linked polyethylene insulated power cable.

Background technique

Because cross-linked polyethylene (XLPE) cables have the advantages of good insulation performance, high breakdown field strength, excellent heat resistance and aging resistance, they are widely used in power systems. However, the aging of water trees has always been an important factor affecting the normal operation of XLPE cables. With the growth of water trees, the electric field at the tip of water trees becomes more concentrated, and the local high electric field eventually causes electric trees at the tips of water trees. The insulation of XLPE cables has been broken down in a short period of time. Although a large number of waterproof concept cables have been introduced at present, because they all introduce water-blocking structures outside the insulated core or in the conductor, and the insulating material itself does not have water tree resistance, the cable runs After a period of time, with the aging of the waterproof material, moisture will eventually enter the interior of the XLPE insulation, and eventually cause cable breakdown accidents caused by water trees, especially the waterproof structure of the cable caused by improper construction methods during the cable laying process. The hidden dangers of undetected damage. the

Contents of the invention

In order to overcome the current waterproof cable on the market after the waterproof structure fails, because the insulating material itself does not have the water tree breakdown performance of the cable, the water tree breakdown accident occurs rapidly in the cable, the utility model provides a new type of waterproof tree breakdown cable, The test cable not only has the waterproof function of ordinary waterproof cables, but also has the ability to generate waterproof trees after the waterproof structure of the cable fails or is damaged because the insulating material uses waterproof tree insulation materials.

The technical solution adopted by the utility model to solve the problem is: 6-35kV waterproof tree cross-linked polyethylene insulated power cable, including a conductor core. When the cable is a single-core structure, the conductor core is wrapped with a conductor shielding layer, Water tree-resistant XLPE insulation layer, insulation shielding layer, metal shielding layer, comprehensive waterproof layer, armor layer, and outer sheath; when the cable adopts a three-core structure, the conductor core is sequentially wrapped with a conductor shielding layer, water tree XLPE insulation layer Layer, insulation shielding layer, and metal shielding layer form a single cable. Fillers are filled between the cables, and a comprehensive waterproof layer, armored layer, and outer sheath are wrapped in sequence outside the cable.

The beneficial effect of the utility model is that: in addition to the waterproof structure of the general waterproof cable, the waterproof tree XLPE is used as the insulating material, which not only has the excellent electrical insulation performance and breakdown field strength of the ordinary XLPE insulating material, but also because The anti-water tree additive is added during the preparation of the insulating material, so it also has excellent anti-water tree formation performance. When the waterproof structure of the cable fails due to aging or damage by external force, the insulating material itself has the ability to resist the formation of water trees, which can still ensure that the cable insulation maintains excellent electrical performance, thus ensuring the safe and stable operation of the power line and increasing the cable life. service life. the

Description of drawings

Figure 1 is a cross-sectional view of the structure of the single-core cable described in the present invention.

Fig. 2 is a cross-sectional view of the structure of the three-core cable described in the present invention.

Detailed ways

Describe the utility model in detail below in conjunction with accompanying drawing;

As shown in Figure 1, a 6-35kV waterproof tree cross-linked polyethylene insulated power cable includes a conductor core 1. When the cable is a single-core structure, the conductor core 1 is wrapped with a conductor shielding layer 2, water-resistant Tree XLPE insulating layer 3, insulating shielding layer 4, metal shielding layer 5, comprehensive waterproof layer 6, armoring layer 7, and outer sheathing layer 8.

As shown in Figure 2, the 6-35kV water-resistant tree XLPE insulated power cable includes a conductor core 1. When the cable adopts a three-core structure, the conductor core 1 is wrapped with a conductor shielding layer 2 and a water-resistant tree XLPE insulation layer in turn. Layer 3, insulating shielding layer 4, and metal shielding layer 5 form a single cable 11, and fillers 9 are filled between the cables 11, and a comprehensive waterproof layer 6, an armored layer 7, and an outer sheath are sequentially wrapped outside the cable. 8.

Claims (1)

1. A 6-35kV waterproof tree cross-linked polyethylene insulated power cable, characterized in that it includes a conductor core (1), and when the cable is a single-core structure, the conductor core (1) is wrapped with conductors in turn Shielding layer (2), water tree resistant XLPE insulating layer (3), insulating shielding layer (4), metal shielding layer (5), comprehensive waterproof layer (6), armor layer (7), outer sheath layer (8); When the cable adopts a three-core structure, a conductor shielding layer (2), a water tree-resistant XLPE insulating layer (3), an insulating shielding layer (4), and a metal shielding layer (5) are sequentially wrapped outside the conductor core (1) to form a single A cable (11), the cables (11) are filled with fillers (9), and the cables are sequentially wrapped with a comprehensive waterproof layer (6), an armor layer (7), and an outer sheath (8).

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