A consideration of changes of AC breakdown voltages during an accelerated test of immersed dry-cured XLPE cables

[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials Pub Date : 1991-07-08 DOI:10.1109/ICPADM.1991.172104

T. Hashizume, C. Shinoda, K. Nakamura, M. Hotta, T. Tani, T. Taniguchi

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引用次数: 3

Abstract

The authors describe the results of an accelerated aging test of 6.6 kV cross-linked polyethylene (XLPE) insulated cables made by a dry-curing process. The accelerated aging test described permits the study of the AC breakdown mechanism. The accelerated test was carried out by applying 6.9 kV, at 1 kHz, at room temperature, with the conductor strands and the insulation shield kept constantly moist. The AC breakdown voltage was investigated for a given aging time. Within three months of aging time, the breakdown voltage decreased to about half of the initial breakdown voltage. This decrease is found to be mainly caused by the moisture permeating the insulation of the cables. To clarify the influence of moisture on the breakdown voltage, some further tests were carried out. The results clearly show that the breakdown voltage is reduced in the presence of even an infinitesimal moisture content. Also, as expected, the presence of micro-water paths in the amorphous region caused the reduction of breakdown voltage.<>

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浸没干固化交联聚乙烯电缆加速试验中交流击穿电压变化的考虑

介绍了干法硫化6.6 kV交联聚乙烯(XLPE)绝缘电缆的加速老化试验结果。所描述的加速老化试验允许研究交流击穿机理。加速试验是在室温下，施加6.9 kV, 1 kHz电流，导线束和绝缘屏蔽持续湿润的条件下进行的。研究了给定老化时间下的交流击穿电压。老化3个月后，击穿电压降至初始击穿电压的一半左右。发现这种下降主要是由于湿气渗透电缆绝缘造成的。为了弄清湿度对击穿电压的影响，进行了进一步的试验。结果清楚地表明，即使在无限小的水分存在下，击穿电压也会降低。此外，正如预期的那样，非晶区微水路径的存在导致了击穿电压的降低。

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[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials

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