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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...
This paper presents results of space charge and conduction current measurements performed on ethylene-vinyl-acetate nanofilled by a layered silicate. Large space charge and conduction current magnitude were observed. To clarify this behavior, fast-acquisition space charge measurements were performed using blocking electrode, with the aim of varying the charge injection/extraction barrier at the electrodes...
Focused on the analysis of some parameters derived from pulse electroacoustic measurements, the article tries to identify the evolution of space charge and field in paper-oil systems submitted to gamma radiation, and to emphasize, by comparing to unaged structures, some aspects susceptible to lead to a higher reliability of DC cables insulation for nuclear power.
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