| 周兴梅,蔡彪,彭庆军,颜冰.聚四氟乙烯空间电荷测量及温度特性分析[J].,2018,46(5):109-113. |
| 聚四氟乙烯空间电荷测量及温度特性分析 |
| Analysis of Space Charge Characteristics of Polytetralfuoroethylene Corresponding to Various Temperatures and Measurement of Space Charge Distribution Based on PEA |
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| DOI： |
| 中文关键词: 聚四氟乙烯 空间电荷 电声脉冲法 温度 电场 |
| 英文关键词: Polytetrafluoroethylene (PTFE) space charge electroacoustic pulse method (PEA) temperature |
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| 中文摘要: |
| 聚四氟乙烯(PTFE)薄膜与硅油构成的复合绝缘材料在干式高压电器有着广泛的应用.但是聚四氟乙烯作为复合绝缘的关键组成部分,其空间电荷分布特点还不清楚,而已有的研究表明,空间电荷对绝缘放电有着不可忽略的影响,因此,本文采用电声脉冲法对聚四氟乙烯薄膜在不同温度下的空间电荷分布进行了测量.结果表明,在外加直流电场的作用下,PTFE介质中容易积聚负极性空间电荷.其次温度的提高有助于加快聚四氟乙烯介质的空间电荷消散速率,有助于电荷消散.但是,温度的提高同样会导致PTFE的空间电荷注入、积聚速度加快,并促进介质中杂质电离,使得PTFE介质中积聚更多的空间电荷.因此,从尽量消除介质空间电荷的角度,建议PTFE绝缘介质尽量避免在高温下运行工作. |
| 英文摘要: |
| The composite insulating material composed of PTFE film and silicone oil is widely used in dry-type high voltage apparatus. Though PTFE film is as a key component of the composite insulation, the spatial charge distribution of it is not clear yet. However, the existing researches prove that the space charge has a great influence on insulation discharge. Therefore, the space charge distribution of polytetrafluoroethylene film at different temperatures is measured by electroacoustic pulse method. The results show that the negative space charge is easy to accumulate in the PTFE medium under the DC electric field. Secondly, the increase of temperature helps to accelerate the rate of space charge dissipation in the PTFE medium and dissipate the charge. However, the increase of temperature will also lead to the increase of space charge injection and accumulation of PTFE, and might promote the ionization of impurities in the medium, leading to the accumulation of lots of space charge in the PTFE medium. Therefore, it is recommended that the PTFE insulation medium should possibly be avoided to operate at high temperature. |
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