Performance of natural ester oils have not been investigated deeply yet, and concerns exist about their behavior under overstresses and partial discharges. The present work investigates the suitability of novel carbon quantum dots (CQD) decorated nanostructured natural ester based corn oil for transformer insulation applications, particularly focusing on collecting database for overstressed conditions due to lightning impulse (LI) and partial discharge (PD). CQD nanofluids prepared with SiO2 and TiO2 nanofillers are tested for its insulation properties such as PD, LI and AC power frequency breakdown voltage (BDV). The tests are carried out at different concentration of nanofillers with the mass fractions of 0.01, 0.05 and 0.1. Statistical analysis of test data is performed using two parameter Weibull distribution and the results are compared with and without CQD treatment. Results are also compared with conventional mineral oil. Addition of CQD treated insulative SiO2 nanofillers show good insulation performance than semiconductive TiO2 nanofillers. The overall results clearly indicate the positive influence of CQD treatment on SiO2/TiO2 nanoparticles at lower %wt (0.01%wt) concentration of nanofillers and clearly show the suitability for MV transformer insulation applications.

中文翻译：

---

对环境兼容的能量转换的贡献：碳量子点装饰的纳米结构天然酯油的表征

天然酯油的性能尚未得到深入研究，并且存在对其在过应力和局部放电下的行为的担忧。目前的工作研究了新型碳量子点 (CQD) 装饰的纳米结构天然酯基玉米油在变压器绝缘应用中的适用性，特别是收集由于雷电脉冲 (LI) 和局部放电 (PD) 引起的过应力情况的数据库。测试了用 SiO2 和 TiO2 纳米填料制备的 CQD 纳米流体的绝缘性能，如 PD、LI 和交流工频击穿电压 (BDV)。测试在不同浓度的纳米填料下进行，质量分数分别为 0.01、0.05 和 0.1。使用二参数威布尔分布对测试数据进行统计分析，并比较有和没有 CQD 处理的结果。结果也与常规矿物油进行了比较。添加 CQD 处理的绝缘 SiO2 纳米填料显示出比半导体 TiO2 纳米填料更好的绝缘性能。总体结果清楚地表明，在较低 %wt (0.01%wt) 纳米填料浓度下，CQD 处理对 SiO2/TiO2 纳米颗粒有积极影响，并清楚地表明适用于 MV 变压器绝缘应用。