A Study of Surface Discharge Characteristics for Dew-Point of Dry-Air and Materials or Shapes of Solid Insulator in Quasi-Uniform Field

2013 ◽  
Vol 27 (6) ◽  
pp. 44-49 ◽  
Author(s):  
Gyeong-Jun Min ◽  
Byoung-Chil Kang ◽  
Dong-Young Lim ◽  
Kwang-Sik Lee ◽  
Won-Zoo Park
Keyword(s):  
Dew Point ◽  
Surface Discharge ◽  
Uniform Field ◽  
Discharge Characteristics ◽  
Dry Air ◽  
Solid Insulator

scholarly journals Surface Discharge Mechanism on Epoxy Resin in Electronegative Gases and Its Application

2020 ◽  
Vol 10 (19) ◽  
pp. 6673
Author(s):  
Herie Park ◽  
Dong-Young Lim ◽  
Sungwoo Bae
Keyword(s):  
Sulfur Hexafluoride ◽  
Design Method ◽  
Surface Discharge ◽  
Uniform Field ◽  
Dielectric Characteristics ◽  
Discharge Mechanism ◽  
Dry Air ◽  
Surface Flashover ◽  
Flashover Voltage ◽  
Insulation Performance

This study presents the surface discharge characteristics of insulating gases, including sulfur hexafluoride (SF6), dry air, and N2, under a non-uniform field. Surface discharge experiments were conducted, with the gas pressure ranging from 0.1 to 0.6 MPa, on samples of epoxy dielectrics under an AC voltage. The experimental results showed that the surface insulation performance significantly improved in insulating gases possessing electronegative gases, such as SF6 and dry air. Surface flashover voltages of SF6 were saturated with an increasing pressure, compared to dry air and N2. The surface discharge mechanism is proposed to explain the improvement and saturation of dielectric characteristics of the electronegative gas in complex dielectric insulations, as well as its influence on the surface flashover voltage. As an application, an insulation design method is discussed with regards to replacing SF6 gas in high-voltage power equipment based on the knowledge of the physics behind gas discharge.

Discharge and Flashover Behavior in Oil-Paper

2020 ◽  
pp. 105-128
Keyword(s):  
Electric Field ◽  
Operating Conditions ◽  
Surface Discharge ◽  
Discharge Characteristics ◽  
Dc Voltage ◽  
Composite Field ◽  
Field Distortion ◽  
Lightning Impulse ◽  
Creeping Discharge ◽  
Paper Insulation

Due to special operating conditions, the valve side bushing of the converter transformer connected to the converter valve is subject to complex voltage excitation, including DC voltage, AC/DC composite voltage, lightning impulse overvoltage, or composite voltage of operating overvoltage and DC. Under the action of this complicated electric field, the oil-paper insulation of the valve-side bushing of the converter transformer is prone to electric field distortion due to charge accumulation, which causes a surface discharge, which will seriously cause the edge breakdown. At the same time, since the temperature in the converter transformer rises due to a large amount of loss during the operation of the transformer, creeping discharge is more likely to occur under the electrothermal composite field. Hence, it is significant to carry out research on the surface discharge characteristics of the oil-paper insulation on the valve side of the converter transformer under the electrothermal composite field.

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