CN202282193U - Twin-core twisted bipolar direct current cable - Google Patents

Abstract

The utility model relates to a twin-core twisted bipolar DC cable. The cable includes an outer sheath and two inner cables arranged in the outer sheath. Each inner cable is successively composed of a metal shielding layer, an insulating Semiconductive shields, insulating layers, conductors Semiconductive shields and conductors. Compared with the prior art, the utility model has the advantages of being able to offset the electromagnetic interference generated by harmonics to the greatest extent, and having lower cost and more convenient construction.

Description

A twin-core twisted type bipolar DC cable

technical field

The utility model relates to a direct current cable, in particular to a twin-core twisted bipolar direct current cable.

Background technique

The current DC cables are all single-core unipolar cables, and the positive and negative poles are often laid at the same time during the use of DC power transmission projects. However, due to the rectification device in the DC cable, harmonics will be generated in it. When the DC cable passes through the ferromagnetic material or is close to the communication cable, these high-frequency harmonics will cause the heating of the ferromagnetic material and interfere with the communication cable. . This requires the positive and negative cables to be laid closely so that the electromagnetic interference caused by the harmonics in the positive and negative cables cancels each other out, but the distance between the cores of the positive and negative cables is still too large due to the existence of single-stage DC cable armor , so the electromagnetic interference generated by the positive and negative cable harmonics cannot be completely offset.

Utility model content

The purpose of this utility model is to provide a twin-core twisted bipolar DC cable that can offset the electromagnetic interference generated by harmonic waves to the greatest extent, and has lower cost and more convenient construction in order to overcome the above-mentioned defects in the prior art.

The purpose of this utility model can be achieved through the following technical solutions: a double-core twisted bipolar DC cable, characterized in that the cable includes an outer sheath and two inner cables arranged in the outer sheath, each The inner cable is metal shielding layer, insulating semiconducting shielding layer, insulating layer, conductor semiconducting shielding layer and conductor from outside to inside.

The outer sheath includes an insulating outer sheath and a metal outer sheath, and the insulating outer sheath wraps the outer surface of the metal outer sheath.

The two inner cables are twisted and arranged with each other.

Compared with the prior art, the utility model uses twin-core twisting to make the distance between the positive and negative cores of the DC cable closer, so as to offset the electromagnetic interference generated by harmonics to the greatest extent, and the double-core bipolar cable is compared with two single The overall cost of polarized cables is lower, and it can also make cable construction more convenient and save money during laying.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a twin-core twisted type bipolar DC cable of the present invention;

Fig. 2 is a schematic diagram of the inner cable twisting structure of the utility model.

Detailed ways

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

Example

As shown in Figure 1, a twin-core twisted bipolar DC cable, the cable includes an outer sheath and two inner cables inside the outer sheath, each inner cable is a metal shielding layer from the outside to the inside 3. Insulating semiconducting shielding layer 4 , insulating layer 5 , conducting semiconducting shielding layer 6 and conductor 7 . The outer sheath includes an insulating outer sheath 1 and a metal outer sheath 2 , and the insulating outer sheath 1 is wrapped on the outer surface of the metal outer sheath 2 . The two inner cables are twisted with each other inside the metal sheath, as shown in Figure 2.

Claims (3)

1. the stranded type bipolarity of twin-core direct current cables; It is characterized in that; This cable comprises oversheath and is located at two inner cables in the oversheath that every inner cable is followed successively by metal screen layer, insulation semiconductive shielding layer, insulating barrier, conductor semiconductive shielding layer and conductor from outside to inside.

2. the stranded type bipolarity of a kind of twin-core according to claim 1 direct current cables is characterized in that, described oversheath comprises insulation oversheath and metallic jacket, and described insulation oversheath is wrapped in the metallic jacket outer surface.

3. the stranded type bipolarity of a kind of twin-core according to claim 1 direct current cables is characterized in that, the mutual stranded setting of described two inner cables.

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