Research progress on space charge measurement and space charge characteristics of nanodielectrics

Abstract

Since the proposal of the notion of nanodielectric, the space charge characteristics of nanodielectrics have been widely investigated. With the addition of nanoparticles, some nanodielectrics exhibit smaller space charge accumulation amount during the polarisation, and also faster charge decay during the depolarisation, which is believed to be related to the interfacial layer between the nanoparticle and the base material. In this study, the space charge measurement methods, theoretical models, and experimental results are reviewed in detail. Space charge measurement methods have been greatly improved after more than 20 years development. The nature of the interfacial layer between the nanoparticle and the base material has been investigated in detail, and based on that, several models are proposed to explain some electrical experimental results of nanodielectrics. Furthermore, the parameters of nanoparticle (such as the type, size, amount, shape, and the surface modification), the experimental conditions, and the base material properties can strongly affect the space charge characteristics of nanodielectrics. This study will provide useful research results and conclusions for researchers, and may also be an overview for recent study and an outlook for future investigation on space charge characteristics of nanodielectrics.

Research on the Effect of Unipolar Pulse Wave Voltage on Space Charge Characteristics for High-Frequency Equipment Insulation

“…The current research on space charge mainly depends on the direct measurement technologies for insulating materials, among which the pulsed electro-acoustic (PEA) method has become the most mature one after more than thirty years of development [12]. It has been widely utilized in the traditional measurement environments including DC and AC voltages within power frequency.…”

Analysis of space charge and charge trap characteristics of gamma irradiated silicone rubber nanocomposites

“…Under high electrical stress, dielectric materials are prone to accumulate charge in the bulk of the material. The electrical properties of the insulating material, such as conduction and breakdown strength are greatly altered by the presence of space charge in the bulk of the material [11, 12]. In addition, the electric field is distorted due to space charge accumulation, which affects the localised electric field and may lead to premature failure of the insulator [13].…”

Functionalization of Silica Nanoparticles to Improve Crosslinking Degree, Insulation Performance and Space Charge Characteristics of UV-initiated XLPE

“…The surface modification technology of nanodielectrics (polymer dielectric nanocomposites) suggests a strategic routine for improving the electrical, thermal and mechanical properties of cable insulating materials [ 11 , 12 , 13 ]. The introduction of inorganic nanoparticles can endow polymer nanocomposites with significant amelioration in insulation performances, such as the enhanced breakdown field strength [ 14 ], suppressed space charge accumulation [ 15 ] and improved electric-tree resistance [ 16 ], and will simultaneously improve the thermal conductivity, thermostability and mechanical properties such as tensile strength and impact strength [ 17 , 18 ]. Currently, the intensively studied inorganic nanofillers for modifying XLPE materials are primarily made from silica (SiO 2 ) or magnesium oxide (MgO).…”