3results about How to "Avoid skin effect" patented technology

The invention relates to the technical field of cable production, in particular to a multi-strand stranded multi-core cable, which comprises a main core and auxiliary cores wound outside the main core, a filling layer is filled between the main core and the auxiliary cores, the main core is provided with one and serves as a central strand, six auxiliary cores are stranded outside the main core, insulating layers are wound outside the auxiliary cores, and the insulating layers are wound outside the auxiliary cores. According to the multi-core cable, the multi-core cable is adopted, the skin effect of the cable is avoided, the power consumption of the cable is reduced, meanwhile, the cable core filling paste is filled in and out of the combined cable core, the cable core filling paste is filled in and out of the combined cable core, and the cable core filling paste is not prone to falling off, so that the service life of the cable is prolonged. Therefore, the cavity at the contact part of the main core and the auxiliary core is filled, the internal gap of the combined cable core is effectively reduced, and the structural strength and the filling density of the combined cable core are ensured; the invention further provides a manufacturing process of the multi-strand stranded multi-core cable suitable for the multi-strand stranded multi-core cable.

The utility model discloses a Hilbert fractal medium-short wave antenna, which belongs to the field of antennas and comprises a radiation part, an earth screen part and a feed part. The radiation part comprises a metal supporting rod, a Hilbert fractal structure and a wave trap, an original surface current distribution path is cut off, a cascade inductor is introduced, and the high-frequency skin effect is inhibited. The earth screen system is of a double-layer structure, a middle earth screen intercepts space waves, and a bottom earth screen is connected with ferrite magnetic beads in series to absorb common-mode noise. A balun and a pi-T mixed matching network are arranged in the feed system, and the standing-wave ratio is smaller than or equal to 1.5. The working bandwidth of the antenna is 526.5 KHz-28 MHz, the interference suppression depth is-35 dB, and the antenna is suitable for portable emergency communication and fixed monitoring stations.

The utility model relates to a kind of high-voltage cable and high-voltage cable system, and the high-voltage cable includes center layer and conductor layer. Among them, the center layer is formed by twisting multiple insulated filaments;Conductor layer, coated center layer, conductor layer includes multiple composite conductor layers sequentially arranged along the first direction, composite conductor layer is formed by twisting multiple insulated filaments, or multiple bare conductors are twisted to form, or insulated filaments and bare conductors are twisted to form according to preset proportion. The above-mentioned high-voltage cable, the center layer uses insulated filament, the conductor layer uses insulated filament or bare conductor or the combination structure of both, suppresses skin effect, ensures uniform distribution of current, improves cable conductor carrying capacity;At the same time, it greatly reduces the amount of enameled conductor, has small size, low loss, high reliability.