Influence of Microbubbles Motion State on Partial Discharge in Transformer Oil

被引：18
|
作者：
Tang, Ju [1 ,2 ]
Ma, Shouxiao [1 ]
Zhang, Mingjun [1 ]
Liu, Zhiyuan [1 ]
Li, Xingxing [1 ]
Gui, Yingang [1 ]
机构：
[1] State Key Lab Power Transmiss Equipment & Syst Se, Chongqing 400044, Peoples R China
[2] Wuhan Univ, Sch Elect Engn, Wuhan 430072, Peoples R China
来源：
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | 2015年 / 22卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Transformer oil; motion state; microbubble; partial discharge; characteristics analysis; dielectric strength;
D O I：
10.1109/TDEI.2015.005028
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
To study the influence of microbubbles motion state on partial discharge (PD) in transformer oil, an experimental platform of suspended microbubbles in transformer oil is established. Deformations of suspended microbubbles in mobile and stationary states are observed. The Ultra-high frequency (UHF) and pulsed current methods are applied to detect the PD of mobile and stationary microbubbles. In addition, the time-frequency characteristic of different PD is analyzed, and an Phi-U-N map is constructed. A deformation parameter (c) of microbubble is defined, and the electric field distribution is analyzed with the change of c. The results show that oil flow has a significant influence on the PD of microbubbles. When the motion state of microbubble changes from stationary to mobile, we find that the stretched shape of microbubble changes from horizontal ellipsoid to vertical one, the PD inception voltage increases, and the electric field strength inside microbubble decreases. Therefore, mobile microbubbles are harder to lead to PD than stationary microbubbles, signifying that increasing the oil flow helps to enhance the dielectric strength of oil.
引用
收藏
页码：2646 / 2652
页数：7
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