High field dielectric properties of nonpolar polymeric films
High field dielectric properties of nonpolar polymeric films
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非极性聚合物薄膜的高场介电性能
DOI：
10.1109/ceidp.2012.6378745
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Tohyama
中科院分区：
文献类型：
--
作者：
S. Watanabe;K. Tohyama
诸如LDPE（低密度聚乙烯）、PP（聚丙烯）等的非极性聚合物材料由于其高绝缘性能而广泛用于电力电缆的绝缘体、电力电容的介电材料等。众所周知，在高场区域，耗散电流波形表现出非线性，并且在退化的初始阶段，即高场应用后不久，也观察到电致发光（EL）[1]。这些现象被认为与电极的电荷注入和金属电极附近瞬时空间电荷的形成有关。因此，研究耗散电流波形与电致发光之间的关系对于阐明交流高场下的导电机制具有重要意义，这与开发更高性能的绝缘材料和研究退化现象有关[2]。由于空间电荷的形成是一个时间依赖性的现象，在这项研究中，耗散电流波形和EL的电场依赖性已被调查的频率分别为50，200，400和1,000 Hz，通过使用LDPE和PP薄膜。作为实验的结果，研究了LDPE和PP之间的电致发光起始场。PP的起始场略高于LDPE。这些样品的类似趋势也证实了对电场的依赖性的第三谐波分量的耗散电流波形。而LDPE和PP的耗散电流与电致发光脉冲数的关系在各频率下基本相同。当频率从50 Hz变化到1，000 Hz时，由于与EL脉冲数的增加相比，耗散电流随频率上升而增加较大，因此特性本身向较高频率下的大耗散电流移动。结果表明，频率的升高使空间电荷层的数量减少，从而可能导致内部电场小于外加电场。认为随着频率的升高，注入电荷对电致发光的贡献逐渐减小，注入电荷主要贡献于导电。本研究从电激发光脉冲数分布及耗散电流波形的结果，探讨非极性聚合物在交流高电场下的导电机制。
Nonpolar polymeric materials, such as LDPE (Low Density Polyethylene), PP (Polypropylene), and so on, are widely used for an insulator of power cable, a dielectric material of power capacitance, etc. due to their high insulating performance. In high field region, it is known that the dissipation current waveform shows nonlinearity and the electroluminescence (EL) is also observed at the initial stage of degradation, that is, just after the high field application [1]. These phenomena are considered that it is relating with the charge injection from the electrode and the instantaneous space charge formation at the vicinity of metal electrode. Thus the investigation of the relation between the dissipation current waveform and EL is important on to clarify the conduction mechanisms under ac high field, which is connecting to the developing the further high performance insulation material and the studying the degradation phenomena [2]. As the space charge formation is a time dependence phenomena, in this study, the electric field dependences of dissipation current waveform and EL have been investigated at the frequencies 50, 200, 400 and 1,000 Hz, respectively, by using LDPE and PP film. As the results of experiments, the inception field of EL between LDPE and PP were examined. The inception field for PP was slightly higher than that for LDPE. Similar trend for these samples was also confirmed on the electric field dependence of the third harmonic component of dissipation current waveform. However, the relation between the dissipation current and EL pulse number between LDPE and PP were similar at each frequency. When the frequency varied from 50 to 1,000 Hz, as the dissipation current increase with the frequency rise was large compared with the increase of the number of EL pulse, the properties themselves were shifted to the large dissipation current in the higher frequency. It is indicated that the frequency rise makes the quantity of space charge layer small, and it may cause the internal field small compared with the applied field. Then it is considered that the contribution to the EL decreases as the results of frequency rise and most of injected charges contribute the conduction. In this study, the conduction mechanisms of nonpolar polymer under ac high field are discussed from the results of dissipation current waveform and the number of EL pulse distribution.
交流强电场下低密度聚乙烯带电行为的思考
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
Shingo Tsuboi;et al.
通讯作者：
et al.