Measurement of organic and inorganic ions in cable insulation and shields

Conference on Electrical Insulation and Dielectric Phenomena, Pub Date : 1989-10-29 DOI:10.1109/CEIDP.1989.69552

R. Gilbert, J. Crine, B. Noirhomme, S. Pélissou

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引用次数: 5

Abstract

It was demonstrated that HPIC (high-performance ion chromatography) can detect inorganic and organic ions in PE (polyethylene) and XLPE (cross-linked PE) insulation and shields in concentrations as low as approximately 10 mu g/L in the extraction solutions. This analytical technique requires liquid extraction of the ions prior to their content evaluation. The limitations of the extraction technique used are discussed. The detected inorganic ions correspond to the elements determined by other analytical techniques, but the ionic fraction is small. The actual ionic fraction could be higher, since the extraction technique used is far from being optimized. Manufacturing and aging lead to increased SO/sup 2-//sub 4/ and Cl/sup -/ contamination in XLPE cables. Migration from the contaminated shields appears to be one of the causes for this increase. Use of the much cleaner acetylene black should improve the situation. Organic ions were also detected and appear to be essentially by-products of PE oxidation. It is possible that service aging induces the formation of more oxalate ions. Shields made with ethylene vinyl acetate may also generate some acetate ions.<>

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电缆绝缘和屏蔽中有机和无机离子的测量

结果表明，HPIC(高效离子色谱)可以检测到PE(聚乙烯)和XLPE(交联PE)绝缘和屏蔽中的无机和有机离子，萃取溶液的浓度低至约10 μ g/L。这种分析技术需要在离子含量评估之前对其进行液体萃取。讨论了所采用的萃取技术的局限性。检测到的无机离子与其他分析技术测定的元素相对应，但离子比例很小。实际的离子分数可能会更高，因为所使用的提取技术还远远没有得到优化。制造和老化导致XLPE电缆中SO/sup 2-//sub 4/和Cl/sup -/污染增加。受到污染的防护罩的迁移似乎是这种增加的原因之一。使用更清洁的乙炔黑应能改善这种情况。有机离子也被检测到，似乎基本上是PE氧化的副产品。这是可能的使用老化诱导形成更多的草酸盐离子。用乙烯醋酸乙烯制成的保护层也会产生一些醋酸离子。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Conference on Electrical Insulation and Dielectric Phenomena,

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