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聚丙烯绝缘材料电导特性与空间电荷研究

DOI: 10.13336/j.1003-6520.hve.2015.05.005, PP. 1451-1457

Keywords: 等规聚丙烯,强场电导,温度,空间电荷,直流电缆,直流击穿强度

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Abstract:

为考察聚丙烯作为直流电缆绝缘材料在电气性能上的的可行性,选用等规聚丙烯材料制备测试试样,通过差示扫描量热法测试熔融温度(165℃)和结晶温度(111℃),针对击穿特性、强场电导和空间电荷分布与电荷的消散等电气性能对聚丙烯材料进行测试。击穿强度测试发现其交流击穿强度明显低于直流击穿强度,交流击穿强度数据的的分散性相对于直流击穿要好。强场电导特性测试发现在3.3kV/mm电场下当温度升高到90℃时,材料的强场电导明显升高,达到室温时的2倍。空间电荷实验结果表明聚丙烯在较低的电场强度(10、20kV/mm)下未出现明显的空间电荷,而在电场强度达到50kV/mm时,出现了明显的异极性空间电荷。将试样上下电极短接进行短路发现,10、20kV/mm下加压0.5h后,经过0.5h短路放电,试样内部的空间电荷几乎释放完全。而在50kV/mm下加压0.5h后,经过1.5h的短路时间仍然看到试样内部驻留着大量的异极性空间电荷。

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