Electric characteristics of MgO/LDPE nanocomposite up to breakdown under DC ramp voltage
Electric characteristics of MgO/LDPE nanocomposite up to breakdown under DC ramp voltage
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DOI：
10.1109/ceidp.2009.5377863
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发表时间：
2009-08
期刊：
影响因子：
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通讯作者：
T. Okazaki;S. Okuzumi;S. Imazawa;Y. Murakami;M. Nagao;Y. Sekiguchi;C. Reddy;Y. Murata
中科院分区：
文献类型：
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作者：
T. Okazaki;S. Okuzumi;S. Imazawa;Y. Murakami;M. Nagao;Y. Sekiguchi;C. Reddy;Y. Murata
为了解掺有纳米氧化镁的低密度聚乙烯(LDPE)的直流击穿现象，研究了电场以一定的速率增加时，LDPE的直流击穿强度、导通电流、空间电荷形成和击穿前的局部生热等电学性质。纳米复合材料的直流击穿强度高于LDPE。纳米氧化镁的加入抑制了纳米复合氧化物中导电电流相对于平均电场的增加速率(高场下)。在高场下，空间电荷的形成和局部热的产生也受到抑制。这些结果表明，空间电荷对导电电流的抑制作用导致了纳米复合材料具有较高的直流击穿强度。
To understand DC breakdown phenomena of low density polyethylene (LDPE) mixed with nano-sized magnesium oxide (MgO), the electric properties, namely, DC breakdown strength, conduction current, space charge formation and local heat generation up to the breakdown under increasing field with a particular rate of increase was investigated. DC breakdown strength of nanocomposite was found to be high compared to that of LDPE. The increasing rate of the conduction current in nanocomoposite with respect to the average field (under high field) was suppressed by the addition of MgO nano-filler. The space charge formation and the local heat generation were also suppressed under high field. From these results, it is suggested that the suppression effect of conduction current affected by the space charge led to higher DC breakdown strength of nanocomposite material.