Effect of TIPT catalyst on insulation rejuvenation of water-tree aged cables

2013 IEEE International Conference on Solid Dielectrics (ICSD) Pub Date : 2013-10-08 DOI:10.1109/ICSD.2013.6619672

K. Zhou, Xiantao Tao, Wenbiao Tao

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Abstract

In order to understand the role of titanium isopropoxide (TIPT) catalyst on insulation rejuvenation for water tree aged cables, dielectric properties and micro structure changes are investigated for the rejuvenated cables. Needle-shape defects are made inside cross-linked polyethylene (XLPE) cable samples to form water tree in the XLPE layer. The water tree aged samples are injected by the liquid with phenylmethyldimethoxy silane (PMDMS) catalyzed by TIPT for rejuvenation, and the breakdown voltage of the rejuvenated samples is significantly higher than that of the new samples. By the observation of scanning electronic microscope (SEM), the nano-TiO2 particles are observed inside the breakdown channels of the rejuvenated samples. Accordingly, the insulation performance of rejuvenated samples is significantly enhanced by the nano-TiO2 particles. Through analyzing the products of hydrolysis from TIPT, the nano-scale TiO2 particles are observed, and its micro-morphology is consistent with that observed inside the breakdown channels. According to the observation, the insulation enhancement mechanism is described. Therefore, the dielectric property of the rejuvenated cables is improved due to the nano-TiO2 produced by the hydrolysis from TIPT.

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TIPT催化剂对水树老化电缆绝缘再生的影响

为了了解异丙醇钛(TIPT)催化剂对水树老化电缆绝缘再生的作用，研究了水树老化电缆的介电性能和微观结构变化。在交联聚乙烯(XLPE)电缆样品内部形成针状缺陷，在交联聚乙烯层中形成水树。用TIPT催化的PMDMS (phenylmethyldimethoxy silane，苯基甲基二甲氧基硅烷)液体注入水树老化样品进行返青，返青样品的击穿电压明显高于新样品。通过扫描电镜(SEM)观察，在返青样品的击穿通道内观察到纳米tio2颗粒。因此，纳米tio2颗粒的加入显著提高了返老还老样品的绝缘性能。通过对TIPT水解产物的分析，观察到纳米级TiO2颗粒，其微观形貌与击穿通道内观察到的形貌一致。根据观察，描述了保温增强机理。因此，TIPT水解生成的纳米tio2改善了再生电缆的介电性能。

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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2013 IEEE International Conference on Solid Dielectrics (ICSD)

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