Influence of DC electric field on charge accumulation by flow electrification in pressboard power transformers

2016 ◽  
Author(s):  
P. Leblanc ◽  
T. Paillat
Keyword(s):  
Electric Field ◽  
Power Transformers ◽  
Charge Accumulation ◽  
Dc Electric Field ◽  
Flow Electrification

Summary on Mechanism of Oil Flow Electrification in Power Transformers

2011 ◽  
Vol 219-220 ◽  
pp. 622-628
Author(s):  
Qiang Fu ◽  
Xue Jun Xie ◽  
Pin Guo Zou ◽  
Zhi Li ◽  
Yi Hua Qian
Keyword(s):  
Electric Field ◽  
Surface Characteristics ◽  
The State ◽  
Power Transformers ◽  
Solid Materials ◽  
Insulating Layer ◽  
Ac Electric Field ◽  
Oil Flow ◽  
Electric Polarity ◽  
Flow Electrification

The mechanism of oil flow electrification in transformers was described in this paper. The mechanism of oil flow electrification in transformers could be understood from the effect of the oil flow’s movement and the electromotive action of AC electric field. The electric polarity of oil flow and the insulating layer were mainly depended on the state of charged cations and anions in oil, while the surface characteristics of solid materials only played a supporting adsorption role.

scholarly journals Influence of Surface-conductivity Nonuniformity on Charge Accumulation Phenomena of GIS Insulator under DC Electric Field

2011 ◽  
Vol 131 (7) ◽  
pp. 584-590 ◽  
Author(s):  
Taiki Donen ◽  
Hiroyuki Iwabuchi ◽  
Shigeyasu Matsuoka ◽  
Akiko Kumada ◽  
Kunihiko Hidaka ◽  
...  
Keyword(s):  
Electric Field ◽  
Surface Conductivity ◽  
Charge Accumulation ◽  
Dc Electric Field

Electrokinetic Microflow Instability With Conductivity Gradients

2003 ◽  
Author(s):  
Chuan-Hua Chen ◽  
Hao Lin ◽  
Sanjiva K. Lele ◽  
Juan G. Santiago
Keyword(s):  
Electric Field ◽  
Convective Instability ◽  
Flow Instability ◽  
Microfluidic Channels ◽  
Charge Accumulation ◽  
Electrokinetic Flow ◽  
Dc Electric Field ◽  
Bulk Charge ◽  
First Time ◽  
And Diffusion

We have experimentally identified and quantified an electrokinetic flow instability that occurs in DC-electric-field driven microfluidic channels with significant conductivity gradients. We have, for the first time, developed a physical model for this instability which captures the interactions between bulk charge accumulation, electromigration, convection, and diffusion. A linear stability analysis based on this model captures key physics of this convective instability with a threshold electric field. The model and experiments show conductivity gradients and their associated bulk charge accumulation are crucial for such instabilities.

Nonlinear photoacoustic effect of semiconductors in dc electric field

1990 ◽  
Vol 68 (8) ◽  
pp. 3865-3871 ◽  
Author(s):  
Jian‐chun Cheng ◽  
Shu‐yi Zhang ◽  
Yue‐sheng Lu
Keyword(s):  
Electric Field ◽  
Photoacoustic Effect ◽  
Dc Electric Field
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