Analysis of space charge and current characters of oil-immersed-paper with simultaneous measurement

IF 1.4 4区 物理与天体物理 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY AIP Advances Pub Date : 2024-08-09 DOI:10.1063/5.0215303
Yuntong Ma, Zepeng Lv, Yining Zhang, Jinyang Peng, Yi Ge, Kai Wu, Yonghong Cheng
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Abstract

To study the current response to space charge in oil–paper insulation, a simultaneous space charge and external current measurement system are developed for a solid–liquid sample. The space charge and external current of oil-immersed paper are tested under different applied voltages. In the oil–paper sample, it accumulates heterocharge at 0.25 kV and homocharge at a higher voltage. The external currents first decrease and then increase with time. The changing timepoint decreases with the applied voltage. It shows that dynamic space charge evolution influences external current development. An unusual phenomenon is observed that the charge on both electrodes increases without heterocharge accumulation in a certain time range after voltage application, resulting in an increase in the average electric field. The transient electric field and displacement current at the cathode are calculated according to the amount of surface charge at the cathode. It indicates that displacement current takes up the main part of external current and decreases to zero when the surface charge amount stops increasing. After this stage, the conduction current is almost equal to the external current. The correlation between conduction current and electric field is analyzed. It reveals that when the electric field is lower than 5 kV/mm, the conduction current of oil–paper seems to be linear to the electric field strength, following Ohm’s law. When the electric field is higher than 5 kV/mm, the conduction current of oil–paper follows the Fowler–Nordheim law that the ln(jc/E2) is linear to 1/E. The transient external current has great potential in diagnosing electrical equipment.
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通过同步测量分析油浸纸的空间电荷和电流特性
为了研究油纸绝缘中空间电荷的电流响应,我们开发了一种固液样品空间电荷和外部电流同步测量系统。在不同的外加电压下测试了油浸纸张的空间电荷和外加电流。油纸样品在 0.25 千伏电压下积累异种电荷,在更高电压下积累同种电荷。随着时间的推移,外部电流先减小后增大。变化的时间点随着施加电压的增加而减小。这表明动态空间电荷演变影响了外部电流的发展。一个不寻常的现象是,在施加电压后的一定时间范围内,两个电极上的电荷都增加了,但没有异质电荷积累,从而导致平均电场增加。根据阴极表面电荷量计算出阴极的瞬态电场和位移电流。结果表明,位移电流占外部电流的主要部分,当表面电荷量停止增加时,位移电流减小到零。之后,传导电流几乎与外加电流相等。分析了传导电流与电场之间的相关性。结果表明,当电场低于 5 kV/mm 时,油纸的传导电流似乎与电场强度呈线性关系,遵循欧姆定律。当电场高于 5 kV/mm 时,油纸的传导电流遵循 Fowler-Nordheim 定律,即 ln(jc/E2)与 1/E 呈线性关系。瞬态外部电流在诊断电气设备方面具有很大的潜力。
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来源期刊
AIP Advances
AIP Advances NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
2.80
自引率
6.20%
发文量
1233
审稿时长
2-4 weeks
期刊介绍: AIP Advances is an open access journal publishing in all areas of physical sciences—applied, theoretical, and experimental. All published articles are freely available to read, download, and share. The journal prides itself on the belief that all good science is important and relevant. Our inclusive scope and publication standards make it an essential outlet for scientists in the physical sciences. AIP Advances is a community-based journal, with a fast production cycle. The quick publication process and open-access model allows us to quickly distribute new scientific concepts. Our Editors, assisted by peer review, determine whether a manuscript is technically correct and original. After publication, the readership evaluates whether a manuscript is timely, relevant, or significant.
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