中文摘要：

为了研究纳米TiO2改性绝缘纸的绝缘性能，试验室制备了含不同质量分数纳米TiO2的绝缘纸手抄片，并对真空浸油后的绝缘纸性能进行了测试。结果表明在一定的纳米TiO2质量百分比内，改性后的绝缘纸的工频击穿场强得到较大的提高，如在质量分数为3％时，工频击穿场强提高了20．83％。在3％的添加量内绝缘纸的介电常数、介电损耗、电导率都随纳米TiO2含量的增加而减小。对纳米TiO2引起的绝缘纸工频击穿特性和介电性能的相关变化进行了讨论和分析，结果表明加入的纳米TiO2能够与纤维素与绝缘油之间形成较强的相互作用，它们的接触界面可能成为了能够捕获电子的陷阱，这些陷阱能有效地减小电子的平均自由程，遏制自由电子的能量积聚、减小了有效电子的产生几率、提高了油浸绝缘纸的工频击穿场强；纳米TiO2对纤维表面极性基团的束缚作用使绝缘纸的介电性能发生改变。

英文摘要：

To study the insulating properties of the insulation paper modified by nano-TiO2 filler, we prepared handsheets with different mass fraction of nano-TiO2, and tested the performance of insulation paper which was immersed in oill under vacuum conditions. The results showed that power frequency breakdown field strength of insulation paper containing different mass fraction of nano-TiO2 was greatly improved, and power frequency breakdown field strength of insulation paper Containing 3% nano-TiO2 increased by 20.83% .When the mass fraction of nano-TiO2 was not more than 3%, dielectric constant, dielectric loss and electric conductivity decreased with increase of The mass fraction of nano-TiO2. Moreover, the changes of breakdown characteristics and dielectric properties were discussed and analyzed. The analysis shows that a strong interaction is formed between nano-TiO2 and cellulose. Contact interface may be able to capture elec- trons. The trap of capturing electrons can effectively reduce the mean free path of electrons, curb the free electron energy accumulation, reduce the generation of effective electron probability, and improve frequency breakdown field strength of insulation paper in oil. The dielectric properties of the insulation paper is changed by binding effect of interface and cellulose.