This study presents experimental results on the influence of cellulose particles on the breakdown characteristics of transformer oil in a highly non-uniform field under lightning impulse voltage. The experimental results show that as the particle content increases, the breakdown voltage reduces with little change in the breakdown time lag. At the same cellulose particle content, the oil breakdown voltage under oscillating lightning impulse (OLI) is lower than that under standard lightning impulse (SLI) and the breakdown time lag under OLI is longer than that under SLI. The impulse wave oscillation has a large effect on the accumulation of particles around the high voltage electrode and cellulose particles affect the development of the streamer process. At mid to high particle content the accumulation of particles around the high voltage electrode causes a decrease in the conductivity of the surrounding oil. This work contributes to the understanding of the effect of cellulose particles in oil and breakdown and on oscillating waveforms and provides guidance for lightning impulse tests on oil-immersed power transformers in the field.

中文翻译：

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雷电冲击电压下非均匀场中纤维素颗粒变压器油的击穿特性

本研究展示了纤维素颗粒对变压器油在雷电冲击电压下高度非均匀场击穿特性影响的实验结果。实验结果表明，随着颗粒含量的增加，击穿电压降低，击穿时滞几乎没有变化。在纤维素颗粒含量相同的情况下，振荡雷电脉冲（OLI）下的油击穿电压低于标准雷电脉冲（SLI）下的油击穿电压，OLI下的击穿时滞比SLI下的长。脉冲波振荡对高压电极周围颗粒的积累有很大影响，纤维素颗粒影响流光过程的发展。在中高颗粒含量下，高压电极周围的颗粒积聚会导致周围油的电导率降低。这项工作有助于了解纤维素颗粒在油和击穿中的影响以及对振荡波形的影响，并为现场油浸式电力变压器的雷电脉冲测试提供指导。