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This study describes a modified pulsed electroacoustic (PEA) system, which can measure the space charge distribution in dielectric films at low temperatures. The temperature around the sample is controlled by the liquid nitrogen, an electric heating coil as well as a PID temperature controller. The space charge distribution of DC stressed cross-linked polyethylene (XLPE) with the thickness of ∼300...
We measured space charge and external circuit current simultaneously in XLPE sandwiched by semi-conductive layers. Space charge accumulation characteristics are important factor to develop a DC power transmission cable. Many research works to investigate the space charge behavior in insulating material like cross-linked polyethylene (XLPE), which is a typical base insulating material for the DC cable,...
Space charge accumulation behavior under DC stress in a thin polyimide film which is including filler added layers to improve its resistance against a corona discharge was investigated using an improved pulsed electro acoustic (PEA) measurement system. PD (partial discharge) in motors is one of significant problem to be resolved for improvement of its efficiency and operating life, and some newly...
The generation, accumulation, migration and dissipation of the space charge may influence the properties of dielectric largely. In order to study the effect of particle diameters and contents on space charge in epoxy resin composites, micro- and nano- Al2O3/epoxy resin composites were prepared in laboratory by adding Al2O3 particles into epoxy matrix material. The space charge measurement was performed...
Oil-paper is used as the main insulation materials in the convert transformer, one of the vital equipment in HVDC power system. The characteristics of space charge in oil-paper insulation are complex, so the research on space charge phenomenon in converter transformers is instructive on insulation design. This paper reports an investigation into the space charge accumulation and dissipation in a two-layer...
Space charge formation processes were investigated on silicone and acrylic elastomers by the pulsed electro-acoustic (PEA) method. Homo charge injection was observed in silicone as anticipated on one hand. Hetero charge injection was unexpectedly observed in acrylic elastomer on the other hand. This peculiar behavior might be related to material composition and additives. Multiple successive hetero...
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...
This paper reports on the investigation into space charge characteristics at interfaces of multi-layer polymeric materials. Planar low density polyethylene (LDPE) samples were used in this study. DC voltage up-to 10 kV was applied to the sample and space charge measurements were taken using the pulsed electro-acoustic (PEA) technique. Experimental results indicated that the electrode interface plays...
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