固体介质空间电荷与松弛电流的同步测量及应用研究

发布时间：2018-04-11 11:16

本文选题：固体介质 + 空间电荷　；参考：《中国电机工程学报》2017年03期

【摘要】：为克服固体介质内空间电荷和电导分立测量导致实验数据关联性弱的缺陷,基于电声脉冲法原理设计了一套片状试样空间电荷和电导同步测量系统,以获得同片试样在不同电场下的空间电荷和电导动态响应。首先,通过空间电荷测量中电脉冲响应的仿真计算,分析了电脉冲对同步测量时电导的干扰,并采用空间电荷和电导快速分时切换测量的模式解决电脉冲干扰。然后,基于IEC/TS62758-2012空间电荷测量技术校验规范,采用有机玻璃试样对该系统进行了系统验证,以评估空间电荷测量的准确性。最后,采用该系统对低密度聚乙烯(low density polyethylene-LDPE)试样在室温下进行了不同电场时的空间电荷和电导的同步测量,并根据空间电荷时空分布信息计算出位移电流和传导电流分布。结果表明:高(50kV/mm)电场下,半导电/LDPE试样/铝测量结构中LDPE内的位移电流明显低于传导电流,且传导电流的载流子主要源于电极的表面注入,杂质在高场下的解离对传导电流影响不明显。
[Abstract]:The dynamic responses of space charge and conductance of the same sample under different electric fields were obtained.Firstly, the interference of electric pulse to synchronous measurement is analyzed through the simulation calculation of electric pulse response in space charge measurement, and the mode of space charge and conductance fast time-sharing measurement is used to solve the interference of electric pulse.Then, based on the calibration specification of IEC/TS62758-2012 space charge measurement technology, the system is systematically verified by using plexiglass samples to evaluate the accuracy of space charge measurement.Finally, the space charge and conductance of low density polyethylene (LDPE) density polyethylene-LDPE samples at room temperature were measured synchronously under different electric fields, and the displacement current and conduction current distribution were calculated according to the space-time distribution information of space charge.The results show that the displacement current in the semiconductive / LDPE sample / aluminum measurement structure is significantly lower than that in the conducting current under a high electric field of 50 kV / mm, and the carrier of the conduction current is mainly due to the surface injection of the electrode.The dissociation of impurity in high field has no obvious effect on the conduction current.
【作者单位】：上海交通大学电气工程系;
【基金】：国家自然科学基金项目(51327002)~~
【分类号】：TM215

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