scholarly journals Space charge evolution and its effects on electrical tree degradation in silicone rubber at varied temperature under polarity reversal voltage

2022 ◽  
Vol 115 ◽  
pp. 103668
Author(s):  
Yunxiao Zhang ◽  
Yuanxiang Zhou ◽  
Ling Zhang ◽  
Chenyuan Teng ◽  
Xin Huang ◽  
...  
Keyword(s):  
Space Charge ◽  
Silicone Rubber ◽  
Polarity Reversal ◽  
Electrical Tree ◽  
Varied Temperature

Electrical tree initiation in silicone rubber under DC and polarity reversal voltages

2017 ◽  
Vol 88 ◽  
pp. 207-213 ◽  
Author(s):  
Yunxiao Zhang ◽  
Yuanxiang Zhou ◽  
Ming Chen ◽  
Ling Zhang ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
Polarity Reversal ◽  
Electrical Tree

scholarly journals Effect of Temperature on Space Charge Distribution of Oil–Paper Insulation under DC and Polarity Reversal Voltage

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2271 ◽  
Author(s):  
Qingguo Chen ◽  
Jinfeng Zhang ◽  
Minghe Chi ◽  
Peng Tan ◽  
Wenxin Sun
Keyword(s):  
Electric Field ◽  
Space Charge ◽  
Electric Field Distribution ◽  
Operating Conditions ◽  
Polarity Reversal ◽  
Effect Of Temperature ◽  
Slow Decay ◽  
Voltage Polarity ◽  
Field Distortion ◽  
Paper Insulation

The electric field distortion caused by space charge is an important factor affecting the operation reliability of oil–paper insulation in a converter transformer. To study the accumulation and decay characteristics of the space charge within oil-impregnated pressboard under DC and polarity reversal voltage, and consider the possible operating conditions of the converter transformer, the space charge behavior of oil-impregnated pressboard was measured by the pulsed electro-acoustic (PEA) method in the temperature range from −20 °C to 60 °C. The effect of temperature on the accumulation and decay characteristics of space charge is also analyzed. The space charge accumulated within the pressboard at low temperature is mainly homocharge injected by the electrode, while heterocharge formed by ion dissociation counteracts some of the homocharge at high temperature. Thus, the space charge of pressboard first increases, then decreases, with an increase in temperature. However, slow decay of the space charge causes severe distortion of the electric field distribution in the pressboard during voltage polarity reversal.

scholarly journals Effect of Alumina and Halloysite clay on Electrical tree growth in Silicone Rubber Nanocomposite

2018 ◽  
Vol 2 (3) ◽  
pp. 20-25
Author(s):  
Keyword(s):  
Tree Growth ◽  
Silicone Rubber ◽  
Strength Properties ◽  
Growth Speed ◽  
New Approach ◽  
Undoped Material ◽  
Electrical Tree ◽  
Nano Alumina ◽  
Tree Growth Rate ◽  
Insulation Breakdown

Nowadays Silicone Rubber (SiR) is recommended in high voltage cable accessories fabrication as it offers excellent electrical and mechanical properties. Electrical tree is one of the phenomenon which contributes to the main factor of SiR insulation breakdown. Recently, a new approach has been applied in order to enhance the insulation strength properties by introducing nano filler in undoped material. Thus, this paper presents the influence of nano-alumina and halloysite nanoclay on electrical tree growth in SiR at 0, 1 vol%, 2 vol% and 3 vol% concentration. The electrical tree growth was investigated at 8kVrms after tree inception voltage (TIV) within 30 minutes under room temperature. The results show reductions of electrical tree growth speed and accumulate damage (%) up to 2 vol% nano-alumina and up to 3 vol% halloysite nanoclay. Nevertheless the presence of 3 vol% nano-alumina in SiR leads to the faster electrical tree growth rate and the worst accumulate damage within 1 minute of electrical tree growth process.

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