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The relationship between space charge accumulation and breakdown at various temperatures is investigated by observing the space charge formation in low density polyethylene (LDPE) and LDPE/MgO nanocomposite material under dc high stress. We have reported, earlier, that, enhancement of electric field in LDPE by packet-like charge under dc stress might be a cause of its electrical breakdown. Furthermore,...
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...
Space charge behavior has been investigated in LDPE/MgO composite films including the different size of MgO particles with a diameter of several tens nm (nano) or a few mum (micro) when a dc high stress is applied to the sample at high temperature. It is believed that a positive packet-like charge is injected from the anode, and after that a negative packet charge is injected from the cathode. In...
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