The space charge measurement in MgO/LDPE nanocomposite up to the breakdown under DC ramp voltage
The space charge measurement in MgO/LDPE nanocomposite up to the breakdown under DC ramp voltage
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DOI：
10.1002/tee.20550
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
Y. Murakami;S. Okuzumi;M. Nagao;M. Fukuma;Y. Sekiguchi;M. Goshowaki;Y. Murata
中科院分区：
文献类型：
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作者：
Y. Murakami;S. Okuzumi;M. Nagao;M. Fukuma;Y. Sekiguchi;M. Goshowaki;Y. Murata
为了解纳米氧化镁（MgO）/低密度聚乙烯（LDPE）纳米复合材料在直流电压作用下的基本电学性质，研究了纳米氧化镁/LDPE纳米复合材料在直流斜坡电压下的直流击穿强度和击穿前的空间电荷。含有1 phr MgO纳米填料的1 phr样品（以下称为1 phr样品）的DC击穿强度与0 phr样品相比增加。在0 phr样品的情况下，在击穿前不久，在电极附近最终观察到含有大量负电荷和少量正电荷的均电荷。在1份样品中，正电荷随着平均电场的增加而增加，直到平均电场达到一定值。此后，正电荷随着平均场的增加而减少，直到击穿发生。0 phr样品的场增强比（=最大场/平均场）随平均场的增加而增加并达到饱和。1份样品的场增强比在出现峰值后随平均场的增大而减小。从这些结果，它被认为是由空间电荷决定的传导电流的抑制效果导致更高的DC击穿强度的1 phr样品，而不是与添加的MgO纳米填料的电子雪崩的抑制效果。
To understand basic electric properties of nano-sized magnesium oxide (MgO) / low-density polyethylene (LDPE) nanocomposite under DC voltage application, DC breakdown strength and the space charge up to the breakdown under DC ramp voltage were investigated. DC breakdown strength of 1 phr sample contained 1 phr MgO nanofiller (hereafter, called 1phr sample) increased compared with that of 0 phr sample. In the case of 0 phr sample, the homo charge, containing a huge negative charge and a little positive charge, was finally observed near the electrodes shortly before the breakdown. In the case of 1 phr sample, the positive charge increased with increasing average field until the average field reached certain value. After then, the positive charge decreased with increasing average field until the breakdown occurred. The field enhancement ratio (=maximum field / average field) of 0 phr sample increased with increasing the average field and was saturated. After showing the peak, the field enhancement ratio of 1 phr sample turned to decrease with increasing the average field. From these results, it is thought that the suppression effect of conduction current determined by the space charge leads to higher DC breakdown strength of 1 phr sample, rather than the suppression effect of electronic avalanche with the addition of the MgO nano-filler.