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Effect of Surface Layer on the Space Charge Accumulation in Epoxy Samples under DC Stress
IEEE Transactions on Dielectrics and Electrical Insulation ( IF 2.9 ) Pub Date : 2020-12-01 , DOI: 10.1109/tdei.2020.008801
Thomas Wendel , Josef Kindersberger

Space charge measurements according to the pulsed electroacoustic (PEA) method are performed in disc samples of epoxy at electric fields from about 2 to 20 kV/mm and at temperatures of 25 and 40 °C. The accumulation of homo-charges and hetero-charges in the epoxy samples is found under DC stress. Both homo- and hetero-charges form stable space charge zones. The accumulation of space charges is influenced by a surface layer of the samples, probably caused by casting and oxidation. If the surface layer is removed, no hetero-charge accumulation is observed. Further, the injected homo-charges do not form a stable space charge region in front of the electrode, but travel further into the material, forming an initial wave-front-like charge distribution. A charge transport model is developed taking into account charge injection, charge accumulation and charge transport. The charge transport model is validated by the space charge measurements.

中文翻译:

直流应力下表面层对环氧样品空间电荷积累的影响

根据脉冲电声 (PEA) 方法,在约 2 至 20 kV/mm 的电场和 25 和 40 °C 的温度下,在环氧树脂圆盘样品中进行空间电荷测量。在直流应力下发现环氧树脂样品中同电荷和异电荷的积累。同电荷和异电荷都形成稳定的空间电荷区。空间电荷的积累受样品表面层的影响,可能由铸造和氧化引起。如果去除表面层,则不会观察到异电荷积累。此外,注入的同质电荷不会在电极前形成稳定的空间电荷区,而是进一步进入材料,形成初始波前状电荷分布。考虑到电荷注入,开发了电荷传输模型,电荷积累和电荷传输。电荷输运模型通过空间电荷测量得到验证。
更新日期:2020-12-01
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