Effect of hydrostatic pressure on the polarity effect of impulse breakdown characteristics of transformer oil
Effect of hydrostatic pressure on the polarity effect of impulse breakdown characteristics of transformer oil
复制标题
DOI：
10.1109/tdei.2017.006274
复制
发表时间：
2017
影响因子：
3.1
通讯作者：
Tonglei Wang;Qiaogen Zhang;Heli Ni;Weixiong Yuan;Yuqin Ding;Meng Gao
中科院分区：
文献类型：
--
作者：
Tonglei Wang;Qiaogen Zhang;Heli Ni;Weixiong Yuan;Yuqin Ding;Meng Gao
研究了不同极性脉冲电压作用下静水压力对油流形成和传播过程的影响。研究了Transformer油在较宽静水压范围内的冲击击穿电压和时间滞后的统计特性，并利用劳厄模型计算了统计时间滞后和形成时间滞后。击穿电压分布可用三参数威布尔分布拟合。结果表明，无论是正极性还是负极性，击穿电压都随静水压的增大而增大。但增长趋势不同，负极性呈线性增长，正极性呈饱和增长。在一定电压下，当压强增加时，负极性的击穿时间略有增加，而正极性的击穿时间显著增加。负极性的统计时滞远大于正极性，且静水压力对负极性的影响更大。形成时间滞后的特征有很大的不同：对于负极性，形成时间滞后随静水压力的增加而减小，但减小的幅度很小，而对于正极性，形成时间滞后随静水压力的增加而显著增大。这些差异是由于不同的引发和传播机制，这也是本文讨论。
The aim of this study was to clarify the hydrostatic pressure effect on the initiation and propagation process of oil streamers under the application of pulsed voltage with different polarities. The statistical characteristics of the impulse breakdown voltage and time lag in transformer oil were studied over a wide range of hydrostatic pressure, and the statistical time lag and the formative time lag were calculated by the Laue's pattern. The breakdown voltage distribution can be well fitted by 3 parameter Weibull distribution. The results show that the breakdown voltage increases with the hydrostatic pressure for both positive and negative polarity. However, the increase trend is different, linear for the negative polarity and saturated for the positive polarity. At a fixed voltage, when the pressure is increased, the breakdown time increases slightly for the negative polarity, but remarkably for the positive polarity. The statistical time lag for negative polarity is much larger than positive polarity, and the hydrostatic pressure has greater influence for negative polarity. The characteristics of formative time lag are quite different: for negative polarity, it decreases very slightly with the hydrostatic pressure, but increases remarkably for positive polarity. These differences are due to different initiation and propagation mechanisms, which are also discussed in the paper.