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Special power cable for variable-frequency system

A technology for power cables and frequency conversion systems, applied to power cables, circuits, electrical components, etc. with shielding/conducting layers, which can solve problems such as cable breakdown, interference between main and neutral cores, and unbalanced harmonic voltages , to achieve the effect of suppressing the interference of electromagnetic waves

Inactive Publication Date: 2012-05-23
罗玉刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the interference of pulse voltage, that is, because the frequency adjustment range of the frequency conversion power supply in the frequency conversion system is relatively wide, it contains many high-order harmonics, and the amplitude is also large. Breakdown, and the interference and harmonic voltage generated by the main core and the neutral core are also unbalanced; and there is electromagnetic wave interference, that is, the cable connected to the variable frequency power supply generates electromagnetic waves during operation, which will cause electromagnetic interference to the surrounding adjacent areas, and vice versa External electromagnetic waves can also interfere with frequency conversion cables

Method used

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  • Special power cable for variable-frequency system
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Embodiment Construction

[0009] exist figure 1 Among them, three power cores 1 with equal cross-sectional area are twisted into a cable and then wrapped with a tape 2. The tape 2 is extruded and wrapped with an inner sheath 3. The inner sheath 3 is wrapped in a concentric conductor 4 composed of braided copper wires. The concentric conductor 4 The isolation layer 5 is extruded outside, and the isolation layer 5 is wrapped in a shielding layer 6 composed of braided copper wires, and the shielding layer 6 is extruded and wrapped with an outer sheath 7 .

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Abstract

The invention relates to a special power cable for a variable-frequency system. Three power wire cores with the same cross section area are twisted into a cable, then, a wrapping tape is wrapped outside the cable, an inner sheath is extruded and wrapped, next, a knitting copper wire is used as a concentric conductor, an isolation layer is extruded and is wrapped in a shielding layer, and an outer sheath is extruded and wrapped outside the shielding layer. The cable core consists of three power wire cores with the same cross section area, and in addition, the concentric conductor is arranged outside the cable core for realizing a neutral line effect, so the interference of pulse voltage can be reduced to the lowest level because of the interchangeability effect and the symmetrical balance of conducting wires; and in addition, the shielding layer is arranged in the outer sheath, so the special power cable for the variable-frequency system can effectively inhibit the interference of electromagnetic waves.

Description

technical field [0001] The invention belongs to the technical field of electric wires and cables, in particular to a frequency-variable power cable applicable to frequency-variable speed regulation systems. Background technique [0002] At present, the internal structure of general variable frequency power cables is mainly composed of three common main cores and one neutral core. However, due to the interference of pulse voltage, that is, because the frequency adjustment range of the frequency conversion power supply in the frequency conversion system is relatively wide, it contains many high-order harmonics, and the amplitude is also large. Breakdown, and the interference and harmonic voltage generated by the main core and the neutral core are also unbalanced; and there is electromagnetic wave interference, that is, the cable connected to the variable frequency power supply generates electromagnetic waves during operation, which will cause electromagnetic interference to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B9/02H01B5/08
Inventor 罗玉刚
Owner 罗玉刚