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This study deals with the space charge characteristics of linear/nonlinear double-layered composites, and sets out to explore whether the space charge inside linear layer could be suppressed by the nonlinear barrier layer. The linear layer is pure low density polyethylene (LDPE) matrix. The nonlinear barrier layer is prepared by adding nano Zinc Oxide (ZnO) to LDPE with concentrations of 9.09wt%,...
For the development of HVDC power cable, it is very important to assess the stability and reliability of the polymeric insulation. Any space charges accumulating inside insulation under HVDC voltage will significantly affect the stability and reliability of the HVDC power cable. Therefore, it is important to study the space charge distribution characteristics of polymeric insulation under HVDC power...
At present, the space charge effect has become one of significant problems in the field of high voltage and insulation, which restricts the development of HVDC power cables. The pulse electric-acoustic (PEA) method has been accepted as a common non-destructive approach to measure the distribution of space charge in solid dielectrics. The basic principle of space charge measurement and characteristics...
Spacecraft are sometimes seriously damaged by electrostatic discharge in polymeric materials. Various polymeric materials are used for the surface materials of spacecraft, such as a MultiLayer Insulator (MLI) or an Optical Solar Reflector (OSR). They are charged up by irradiation of solar particles and high-energy charged particles, particularly those such as charged particles like electrons and protons...
Cross linked polyethylene (XLPE) is used in an electric power cable as insulation materials. The maximum thickness of XLPE layer is 27mm in a 500kV class electric power cable. The pulsed electro acoustic (PEA) method is widely used to measure space charge distribution in dielectric materials. When measuring the space charge distribution in dielectric materials by using the normal PEA method, the acoustic...
This work aims at improving the spatial resolution for the pulsed electro-acoustic method - PEA. Whatever the measurement principle considered, the best spatial resolution achieved so far is of the order of several micrometers, being at most 10μm in case of the PEA method. This limit constitutes a drawback when considering rather thin insulating layers (order of tens of μms), as the case in some capacitors...
Space charge distribution in polymeric films after an electronic irradiation depends on the energy, the flux of the beam but also on the material intrinsic properties, its thickness etc. In order to get a better understanding of the charge storage, transport and extraction, it is necessary to compare the results obtained by various tools. In this preliminary work, dielectric films of various thickness...
Influence of thickness in LDPE sheet on electrical field distortion and transient external current under dc step voltage are studied. Temporal change in space charge distribution in LDPE sheets of 100, 200 and 300 mum in thickness are measured by PEA method with evaporated A1 electrode or semiconduction rubber electrode under a mean applied field of 1 MV/cm. No temporal changes in space charge distribution...
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