A main circuit power cable for a medium-voltage frequency converter

Abstract

The invention provides a major loop electric power cable for a medium-voltage frequency converter. The cable comprises three power conductors, three control conductors and a central gap filler, wherein the cross section of the central gap filler is round, a cabled core is formed by stranding of the three power conductors and the three control conductors around the central gap filler, the control conductors are arranged between any two adjacent power conductors, the cabled core is sequentially coated with a third metal shielding layer, an electrostatic shielding layer, a water-blocking tape covering layer, a tin-plated steel wire winding armor layer and a polyolefin outer sheath, and water-blocking ropes with triangular cross sections are placed in gaps between the power conductors, the control conductors and the third metal shielding layer. According to the major loop electric power cable for the medium-voltage frequency converter, effective capacitance is low, transfer impedance is low, good electromagnetic compatibility is achievable, the tensile strength and water resistance of the cable are improved, and the service life of the cable is prolonged.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a main circuit power cable for a medium-voltage frequency converter. Background technique [0002] For power cables for inverters, they are usually used for conveyors, transmission lines and various pressure pumps, fans, central air conditioners, etc. in steel, petrochemical, power plant, paper, textile, metal processing and food processing automatic production lines. Rated voltage 8.7 / 10kv and The following inverter systems. This type of power cable usually requires a high shielding effect. The main circuit power cable connected to the inverter or variable frequency motor generates square waves and high-order harmonics during the transmission of electric energy, which affects the normal operation of other precision instruments. In order to avoid the influence of square waves and high-order harmonics on other precision instruments, it is required that the square waves and h...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems existing in the background technology, the present invention proposes a main circuit power cable for a medium-voltage frequency converter, which effectively solves the problem of square waves and high-order The problem of harmonics not leaking out, has the characteristics of moisture-proof and waterproof, high working temperature, strong electromagnetic interference and strong electrostatic interference resistance, low effective working capacitance and low transmission impedance

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