DC conduction and breakdown characteristics of Al₂O₃/cross-linked polyethylene nanocomposites for high voltage direct current transmission cable insulation

Abstract

We have discussed a cross-linked polyethylene (XLPE) nanocomposite insulating material that is able to DC voltage applications. Nanocomposites, which are composed in polymer matrix mixed with nano-fillers, have received considerable attention because of their potential benefits as dielectrics. The nano-sized alumina oxide (Al 2 O 3 )/XLPE nanocomposite was prepared, and three kinds of test, such as DC breakdown, DC polarity reversal breakdown, and volume resistivity were performed. By the addition of nano-sized Al 2 O 3 filler, both the DC breakdown strength and the volume resistivity of XLPE were increased. A little homogeneous space charge was observed in Al 2 O 3 /XLPE nanocomposite material in the vicinity of electrode through the polarity reversal breakdown test. From these results, it is thought that the addition of Al 2 O 3 nano-filler is effective for the improvement of DC electrical insulating properties of XLPE.

Impact of permittivity and concentration of filler nanoparticles on dielectricpropertiesof polymer nanocomposites

“…The AC breakdown studies are performed on unfilled epoxy and epoxy nanocomposites using a high‐voltage test kit as per ASTM‐D149‐97a [20, 21]. The experiment setup and electrode arrangement for dielectric strength studies are shown in Fig.…”

Effect of Crystallinity of Polyethylene with Different Densities on Breakdown Strength and Conductance Property

“…Some scholars believe that the charge transport mechanism of doped nano-polyethylene in high field strength region (non-ohmic region) is dominated by ion hopping conductance, and it can be deduced from the formula that the ion jump distance increases with increasing temperature [10,11]. Further, they pointed out the “pre-electric stress” effect of polymer nanocomposites under a high electric field [12,13]; others believe that it is dominated by electronic hopping conductance, and the jump distance decreases with increasing temperature [14].…”

Investigation of the electrical properties of XLPE/SiC nanocomposites

“…Since T. J. Lewis [11] first proposed the concept of nanodielectrics in 1994, polyethylene-based nanocomposites have developed from LDPE nanocomposites to XLPE nanocomposites. It has been demonstrated that XLPE nanocomposites can improve electrical properties [12][13][14][15][16][17]. The interface in nanocomposites between the polymer matrix and nanoparticles is the main reason for the improvement in the electrical properties [18][19][20][21][22][23][24].…”