用tan - delta特征诊断交联聚乙烯电缆氧化

Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics Pub Date : 1989-07-03 DOI:10.1109/ICSD.1989.69202

N. Shimizu, N. Hirano, K. Horii

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引用次数: 0

摘要

研究了低密度聚乙烯(LDPE)薄膜中氧化产物的密度与tan δ的温度依赖性之间的关系。通过比较交联聚乙烯(XLPE)电缆中PE的tan δ与PE薄膜样品中的tan δ的温度依赖性，发现tan δ能准确地反映电缆绝缘层的氧化情况。氧化PE膜中tan δ的温度依赖性在0℃左右有一个峰值，这是由极性基团的运动引起的。氧化开始后，tan δ增加到40℃以上，这是由于链断裂产生的一小部分运动。得到了tan δ随氧化产物密度的增加

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Diagnosis of oxidation in XLPE cable by tan delta characteristics

The authors investigated the relationship between the density of oxidation products and the temperature dependence of tan delta in LDPE (low-density polyethylene) films. From a comparison of the temperature dependence of tan delta of PE in XLPE (cross-linked PE) cable with that of tan delta in PE film samples, it was found that tan delta gives accurate information about the oxidation in the insulating layer of the cable. The temperature dependence of tan delta in the oxidized PE film has a peak around 0 degrees C, which is caused by the motion of the polar group. After oxidation has begun, tan delta increases to above 40 degrees C. This is attributed to the motion of a small section produced by chain scission. The increase of tan delta as a function of the density of oxidation products is obtained.<>

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

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