刀板电极下纳米粒子对液体击穿电压的影响

Effects of nanoparticles under blade electrode on breakdown voltage of liquid

针对液体电介质在非均匀电场下畸变严重的问题,选用碳酸丙烯酯为研究对象,配置了AlO纳米流体,测量了刀板电极下纳米AlO改性前后碳的操作冲击击穿电压及稳定性。实验表明:纳米改性后,正极性击穿电压提升了28%,负极性操作电压略有下降;由于不均匀电场造成的极性效应由128%降低到99%,表面纳米粒子可以削弱甚至消除由电场畸变引起的极性效应。并且加入纳米粒子后,电子的移动速度大大降低,对正极性操作冲击电压下的流注发展起到了阻碍作用,由此改善了击穿特性。本文结论可为提高变压器油的绝缘性能提供参考。

Aiming at the problem of serious distortion of liquid dielectrics in non-uniform electric field,propylene carbonate was selected as the research object,and AlOnanofluid was configured in this study.The impulse breakdown voltage and stability of the liquid before and after the modification of nano AlOunder the blade electrode were measured.It is found that after nano-modification,the positive impact breakdown voltage of the liquid is increased by28%,and the negative impact voltage is slightly reduced.The polarity effect caused by the uneven electric field is reduced from 128%to 99%,and the surface nanoparticles can weaken and even eliminate the polarity effect caused by electric field distortion.And after adding nanoparticles,the speed of movement of electrons is greatly reduced.This hinders the streamer development under the positive operating impulse voltage,thereby improving the breakdown characteristics.The conclusion can provide reference for improving the insulation performance of transformer oil.