Surface flashover characteristics of oil-paper insulation under combined AC-DC voltage

2013 IEEE International Conference on Solid Dielectrics (ICSD) Pub Date : 2013-10-08 DOI:10.1109/ICSD.2013.6619696

Yuanxiang Zhou, F. Jin, Q. Sun, Y. Sha, Meng Huang

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引用次数: 12

Abstract

The valve side winding of the converter transformers withstood several types of voltage. This paper investigated the effects of voltage component on the surface flashover characteristics of oil-paper insulation under combined AC-DC voltage in different ratio. The whole flashover process of surface flashover of oil-paper insulation under combined AC-DC voltage was studied by using two types of electrodes. The experimental conclusion was shown that the flashover voltage increased with the DC ratio in the combined AC-DC voltage component. Flashover voltage decreased significantly when the radial electric field increases in the electric field component. Furthermore, electric field distributions versus combined AC-DC voltage in different ratio were calculated by Finite Element Analysis (FEA). Due to the different distribution characteristics of DC electric field and AC electric field, when the DC ratio was higher, the surface flashover location tended to pressboard surface. Conversely, when the AC ratio was higher, it tended to the oil gap between the electrodes. Moreover, based on high-speed camera, it was used to capture emitted light produced by surface flashover, record flashover initiation and propagation process in small oil gap between the electrodes.

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交直流复合电压下油纸绝缘表面闪络特性研究

换流变压器阀侧绕组可承受多种电压。研究了不同交直流组合电压下电压分量对油纸绝缘表面闪络特性的影响。采用两种电极对交直流复合电压下油纸绝缘表面闪络的整个闪络过程进行了研究。实验结果表明，在交直流组合电压分量中，闪络电压随直流比的增大而增大。随着电场分量中径向电场的增大，闪络电压显著降低。通过有限元分析计算了不同比例下电场随交直流组合电压的分布。由于直流电场和交流电场的分布特性不同，当直流比较高时，表面闪络位置倾向于压板表面。相反，当交流比较高时，它倾向于电极之间的油隙。基于高速摄像机，捕捉表面闪络产生的发射光，记录电极间小油隙内闪络的起爆和传播过程。

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2013 IEEE International Conference on Solid Dielectrics (ICSD)

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