基于PEA的聚四氟乙烯空间电荷测量及其温度特性  

Measurement of Space Charges of Polytetrafluoroethylene Based on PEA and Their Temperature Characteristics

作　　者：周兴梅 蔡彪 彭庆军 周天春[3] 

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650106 [2]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400030 [3]电力规划设计总院,北京100120

出　　处：《南方电网技术》2017年第12期51-55,共5页Southern Power System Technology

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。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。The composite insulating material composed of polytetrafluoroethylene （FIFE） film and silicone oil is widely used in dry- type high voltage apparatus. Though PTFE film is a key component of 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 distributions of PTFE film at different temperatures are measured by electroacoustic pulse method. The results show that the negative space charge is easy to accumulate in the PTFE medium under the applied 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, and lead to the accumulation of lots of space charge in the PTFE medium. Therefore, aiming at eliminating as much space charge a possible, it is recommended that the PTFE insulation medium should avoid to be operated at high temperature.

关 键 词：聚四氟乙烯 空间电荷 电声脉冲法 电场 

分 类 号：TM835[电气工程—高电压与绝缘技术]