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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,...
The relation between ageing and space charge is a hot area, but there is little direct evidence. In this paper, oil-paper samples were exposed to 20-kV/mm DC electrical field, 130°C temperature or both 20-kV/mm DC electrical field and 130°C temperature separately. Charge transport through them was analyzed at intervals by the pulsed electroacoustic (PEA) method. We find that the quantity of trapped...
Space charge behavior of the composite of polyethylene and nano-MgO was investigated with pulsed electroacoustic method (PEA). It is found that space charge was well suppressed as the content of nano-MgO is less than 2.0% wt. Also it could be seen that bi-polar injection occurs in the composite as electrical stress increases to 60 kV/mm. Comparing to the amount of space charge in the short-circuited...
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