电缆绝缘材料的直流特性

Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics Pub Date : 1989-07-03 DOI:10.1109/ICSD.1989.69163

T. Suzuki, S. Katakai, M. Kanaoka, Y. Sekii

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引用次数: 10

摘要

采用片状试样和微型电缆研究了PE(聚乙烯)在直流电压下的绝缘性能。制备了不同材料密度和不同聚合工艺的聚乙烯压片，测定了其热激电流和击穿强度。为了确认薄片试样实验中得到的绝缘性能在更厚的试样中也能得到，我们使用绝缘厚度为3.5 mm、导体截面积为60 mm/sup /的微型电缆进行实验，评估击穿强度并测量热激电流。结果表明，HDPE(高密度聚乙烯)在直流电压下具有优良的绝缘性能。击穿强度高，空间电荷积累小。HDPE的这些特性被认为是由于其分子结构，其分子分支的长度很短。

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DC characteristics of cable insulating materials

The insulation performance of PE (polyethylene) under DC voltage was investigated using sheet samples and miniature cables. Pressed sheets of various kinds of PE, which differed in material density and polymerization process, were prepared, and their thermally stimulated current and breakdown strength were measured. To confirm that insulating properties obtained in the experiments using sheet samples can also be obtained in thicker samples, experiments were conducted using miniature cables with 3.5-mm insulation thickness and a conductor cross-sectional area of 60 mm/sup 2/ to evaluate breakdown strength and to measure the thermally stimulated current. Both sets of results showed that HDPE (high-density PE) has excellent insulating properties under DC voltage. The breakdown strength is high and the space charge accumulation is small. These properties of HDPE are considered to be due to its molecular structure, with its short lengths of molecular branches.<>

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Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics

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