Effect of relative humidity on surface discharge characteristics of polymeric material under AC stress

2012 ◽  
Author(s):  
N. Zaharudin ◽  
Y. Z. Arief ◽  
W. A. Izzati ◽  
Z. Adzis ◽  
M. Z. H. Makmud
Keyword(s):  
Relative Humidity ◽  
Polymeric Material ◽  
Surface Discharge ◽  
Discharge Characteristics

scholarly journals An Experimental Study on Surface Discharge Characteristics of Different Types of Polymeric Material under AC Voltage

2013 ◽  
Vol 64 (4) ◽  
Author(s):  
N. Baharin ◽  
Y. Z. Arief ◽  
W. A. Izzati ◽  
M. Z. H. Makmud ◽  
Z. Adzis ◽  
...  
Keyword(s):  
Polymeric Material ◽  
Polymer Surface ◽  
Polymeric Materials ◽  
Ethylene Vinyl Acetate ◽  
Surface Discharge ◽  
Insulation Material ◽  
Discharge Characteristics ◽  
Different Types ◽  
Surface Discharges ◽  
Experimental Works

Surface discharge is a common electrical discharge that normally occurs on the surface of outdoor insulators and also causes the failure in the electrical insulation system. One of the causes of surface discharge is the presence of high voltage stress. Experimental works had been carried out to examine the surface discharge characteristics on polymeric samples as insulation material. The IEC (b) electrode configuration had been used to investigate the surface discharges phenomena of different types of polymeric materials with controlled of air relative humidity (RH). In these experimental works, three types of polymeric sample were selected, namely high-density polyethylene (HDPE), ethylene-vinyl acetate (EVA), and polystyrene (PS), respectively. The characteristics of the discharge are critically depending on the types of polymer. Surface discharges intensity, number of discharge occurrence, and surface morphology of each polymeric material were also investigated. Comparisons of these electrical characteristics were conducted among the samples. Results from the experiment showed that the EVA samples experienced severe degradation as compared to HDPE and PS samples.

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.

scholarly journals Surface discharge characteristics and initiation mechanism of PEEK in nitrogen under semi-square voltage

AIP Advances ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 075322 ◽  
Author(s):  
Pengyu Fu ◽  
Zhibin Zhao ◽  
Xuebao Li ◽  
Xiang Cui ◽  
Teng Wen ◽  
...  
Keyword(s):  
Surface Discharge ◽  
Initiation Mechanism ◽  
Discharge Characteristics

scholarly journals The Correlation between Surface Tracking and Partial Discharge Characteristics on Pressboard Surface Immersed in MIDEL eN

2017 ◽  
Vol 7 (2) ◽  
pp. 631 ◽  
Author(s):  
Nur Amirah Othman ◽  
Hidayat Zainuddin ◽  
Aminuddin Aman ◽  
Sharin Abd Ghani ◽  
Imran Sutan Chairul
Keyword(s):  
Surface Layer ◽  
Monitoring System ◽  
Condition Monitoring ◽  
Partial Discharge ◽  
Experimental Results ◽  
Surface Discharge ◽  
Discharge Characteristics ◽  
Surface Tracking ◽  
Tracking Process ◽  
Condition Monitoring System

This paper presents the investigation of the surface tracking on pressboard surface immersed in MIDEL eN oil.  In this work, the development of surface discharge was analyzed by correlating the visual records of surface tracking on impregnated pressboard and the partial discharge (PD) activities.  The PD activities during the surface tracking process were analyzed in terms of Phase Resolved Partial Discharge (PRPD) patterns.  Throughout the experiment, surface discharge is found as the development of tree-like patterns in the form of white marks occurring on the oil-pressboard interface.  This phenomenon is generally accepted as the drying out process that involves evaporation and decomposition of the oil molecules in the pressboard pores due to the surface discharge activities on the pressboard surface layer.  The development of surface discharge on the pressboard surface can continue from minutes to months or even years until failure.  Thus, condition monitoring system is important to characterize this type of faulty condition.  The experimental results show that there is the decreasing trend of PD magnitude during the development of white mark hallway of a gap distance which is eventually suffered from an unexpected fault.

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