Investigation of the electrical properties of XLPE/SiC nanocomposites

Abstract

The interface between nanoparticles and the polymer matrix, which dominates the electrical properties of nanocomposites, can effectively improve the DC breakdown and suppress space charge accumulation in nanocomposites. To research the interface characteristics, XLPE/SiC nanocomposites with concentrations of 1 wt%, 3 wt% and 5 wt% were prepared. The DC breakdown, dielectric properties and space charge behavior were examined using pulsed electro-acoustic (PEA) equipment and a dielectric analyzer. The test results show that the nanocomposites with concentrations of 1 wt% and 3 wt% have higher DC breakdown field strength than neat XLPE. In contrast, there is a lower DC breakdown strength at a concentration of 5 wt%, possibly due to the agglomeration of nanoparticles. Nanoparticle doping increases the real and imaginary permittivities over those of neat XLPE. Furthermore, with increasing concentration, a larger increase in the permittivity amplitude was observed. Based on the space charge behavior, all nanocomposites could suppress space charge accumulation, but the nanocomposite with a concentration of 1 wt% exhibited the best effect. Meanwhile, heterocharge accumulation near electrodes was observed in neat XLPE and the nanocomposite with a concentration of 5 wt%. In contrast, homocharge accumulation near electrodes was observed in the nanocomposite with a concentration of 3 wt%. This phenomenon may be due to different amounts of shallow traps in nanocomposites with different concentrations, which might lead to differing electron or hole mobility.

Effect of Nanoparticles on the Morphology, Thermal, and Electrical Properties of Low-Density Polyethylene after Thermal Aging

“…In order to analyze the space charge amount in samples with the change of aging time, we calculate the mean volume charge density by using Formula (2) [ 31 ]: where x 0 and x 1 are the positions of the anode and cathode, respectively (induced charges at the electrodes are not taken into account), t is the depolarization time, E P is the polarization voltage, and is the charge density in the nanocomposites.…”

DC breakdown characteristics of XLPE/BNNS nanocomposites considering BN nanosheet concentration, space charge and temperature

“…There have been some studies that show the addition of nanoparticles into the polyethylene matrix can effectively inhibit the charge accumulation and improve the breakdown strength of the material [9][10][11][12][13]. Du and co-workers [14] studied the charge transport characteristics of low-density polyethylene(LDPE)/ graphene nanocomposites and found that the addition of nanographene can introduce a large number of deep traps, which will inhibit space charge and improve the breakdown strength of nanocomposites.…”

Investigation of the Space Charge and DC Breakdown Behavior of XLPE/α-Al2O3 Nanocomposites

“…Various inorganic nanoparticles, including ZnO, SiO 2 , SiC, TiO 2 , MgO, LSMO, and zeolite, have been used to inhibit space charge accumulation in nanocomposites. The addition of these inorganic nanoparticles suppresses the accumulation of space charge, reduces the electrical conductivity, and increases the breakdown strength of insulating materials to various degrees [5][6][7][8][9][10][11][12][13][14][15]. This has been attributed to the introduction of deep trapping states resulted from the generated interface regions by nanoparticles, which can largely reduce charge carrier mobility.…”