Hollow TiO2Spheres Effect on Dielectric Strength of Oil-Paper Composite Insulation

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI:10.1109/CEIDP49254.2020.9437535

Bai-xin Liu, Guangshuai Sun, Yupeng Ying, Y. Lv, Meng Huang, B. Qi

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Abstract

Dielectric strength of transformer oil and oil-impregnated paper has been widely investigated to ensure operation safety of power transformers and other electrical equipment. Addition of nanoparticles has exhibited the ability to improve insulation strength of oil or oil-impregnated paper. However, enhancement on breakdown strength of oil-paper composite insulation (OPCI) is still a challenge, especially under DC voltage. In this work, both solid and hollow TiO2 spheres were synthesized and added to transformer oil and oil-impregnated paper. DC breakdown voltages (DCBV) of OPCI before and after adding spheres indicates that modification effect of hollow spheres is superior to that of solid ones. After adding hollow spheres, the positive and negative DCBV of OPCI are increased to 1.42 times and 1.64 times of the positive DCBV of OPCI with solid spheres, respectively. Possible modification mechanism has been discussed and proposed based on further investigation of electric field distribution and interface-charge characteristic of OPCI with two kinds of spheres.

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空心tio2球对油纸复合绝缘材料介电强度的影响

为了保证电力变压器和其他电气设备的安全运行，对变压器油和油浸纸的介电强度进行了广泛的研究。纳米颗粒的加入可以提高油或油浸纸的绝缘强度。然而，提高油纸复合绝缘的击穿强度仍然是一个挑战，特别是在直流电压下。本文合成了固体和空心TiO2球，并将其添加到变压器油和油浸纸中。添加球体前后OPCI的直流击穿电压(DCBV)表明，空心球体的改性效果优于固体球体。加入空心球后，OPCI的阳性DCBV和阴性DCBV分别增加到固体球OPCI阳性DCBV的1.42倍和1.64倍。在进一步研究两种球体OPCI的电场分布和界面电荷特性的基础上，讨论并提出了可能的改性机理。

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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来源期刊

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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