Effect of Different TS-1 on the Electrical Properties of Cross-Linked Polyethylene

Abstract

Nano-composite dielectric materials are considered as the most promising insulating materials for HVDC cables. The effects of different concentration of nano-filler and structure of nanoparticle on the electrical properties of crosslinked polyethylene (XLPE) composites were studied by using three different chemical treated titanium-silicon molecular sieves TS-1 as nano-filler. The experimental results show that the dielectric properties of the composites increased by 17.76%, 19.16% and 16.36%, respectively, after TS-1 and alkali treatment for 12 h and 24 h. After the addition of the first two fillers, the resistivity was nearly doubled to 46.71% and 47.41%, respectively, and the breakdown field strength was increased by 3.40% and 9.28%, respectively. After 24 h alkali treatment, the volume resistivity and breakdown field strength of TS-1 were lower than that of pure XLPE.

Effect of Nanoporous Molecular Sieves TS-1 on Electrical Properties of Crosslinked Polyethylene Nanocomposites

“…The precipitate was separated by centrifugation and washed several times to remove the excess alkaline material. Finally, the separated precipitate was vacuum-dried at 80 °C for 24 h to remove the residual water to obtain white powder TS-1 [ 18 ].…”

“…The TS-1/XLPE-1 and TS-1/XLPE-2 nanocomposites with filler contents of 0.5, 1.0, 1.5, and 2.0 wt.% were prepared by melt blending two matrices (XLPE-1 and XLPE-2) with TS-1 nanofillers using a torque rheometer (RM-200C). The bulk solid composites obtained after melt blending were sheared into small pieces and thermally compression molded using a flat vulcanizing plate to obtain the corresponding composite films [ 18 , 19 , 36 ].…”

“…Lei’s team [ 17 ], through the study of a one-dimensional Al 2 O 3 nano-air column insulation breakdown model, found that when the aperture size of the nano-air column is smaller than the average free range of the electrons along the parallel electric field or perpendicular to the direction of the electric field, the electron density in the nano-air gap is much lower than that required for the electron avalanche breakdown, which can limit the development of the electron impact ionization to a certain extent. At this time, the gas dielectric material is not following the traditional Townsend and Seitz theory of gas–solid discharge and avalanche breakdown [ 17 , 18 , 19 ], no matter how the strength of the applied electric field is increased, the nano-air gap will not produce insulation breakdown, the formation of insulation mode. Taking this as the theoretical basis, nano-fillers with a pore size structure are introduced into the crosslinked polyethylene matrix to improve the thermal conductivity of the composite material and, at the same time, to utilize the pore size structure of the fillers to inhibit the development of the electron impact ionization to realize the manipulation of avalanche breakdown and to improve the breakdown field strength of the composite material and the insulating strength of the crosslinked polyethylene insulating material.…”