Thermally stimulated depolarization current and space charge measurements on low-density polyethylene: Influence of the presence of antioxidant

2008 ◽  
Vol 109 (5) ◽  
pp. 2768-2773 ◽  
Author(s):  
M. Tebani ◽  
L. Boudou ◽  
J. Guastavino
Keyword(s):  
Space Charge ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Depolarization Current ◽  
Thermally Stimulated Depolarization Current ◽  
Thermally Stimulated Depolarization

scholarly journals Influence of Temperature on Charge Accumulation in Low-Density Polyethylene Based on Depolarization Current and Space Charge Decay

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 587 ◽  
Author(s):  
Guochang Li ◽  
Jiaxing Wang ◽  
Wang Han ◽  
Yanhui Wei ◽  
Shengtao Li
Keyword(s):  
Space Charge ◽  
Charge Trapping ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Insulation Material ◽  
Charge Accumulation ◽  
Depolarization Current ◽  
Close Link ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

Temperature is one of the key factors affecting space charge accumulation in high voltage direct current (HVDC) cable insulation material. The influence of temperature on charge accumulation in low density polyethylene (LDPE) has been investigated with a combined thermally stimulated depolarization current (TSDC) method and pulsed electro-acoustic (PEA) method. The experimental results indicate that there exists a transition temperature region of charge accumulation around 50 °C. The total accumulated charges all firstly increase and then decrease with the increasing polarization temperature under three typical polarization electric fields, and they have more accumulated charges in LDPE around 50 °C. The phenomenon has a close link with the dynamic processes of charge trapping and de-trapping, which were verified by TSDC results. At room temperature, the trapped charges are difficult to release from the traps, and these homocharges near the cathode can depress the further injection of the charges. More charges can be injected from the electrodes with the increase of temperature, while the charge migration is relatively lower before 50 °C, leading to more accumulated charges. When the temperature exceeds around 50 °C, the molecular movement is accelerated which can enhance the hopping probability of charges between the adjacent traps, resulting in few accumulated charges.

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