Title :
Fundamental study on relaxation processes of water tree in aged power cables aimed for diagnosis with spatial resolution
Author :
Hozumi, N. ; Hiei, S. ; Kurihara, T. ; Okamoto, T. ; Uchida, K.
Author_Institution :
Aichi Inst. of Technol., Toyota
Abstract :
The "water tree" is a degradation mode of power cable with polymer insulation. A water tree is composed of small droplets filled with water. As the conductivity in water tree is very high, it leads to dielectric breakdown when it grows up. Inside the water tree is filled with trap sites. Therefore, a water tree can be recognized as an electret.
Keywords :
dielectric relaxation; drops; electric breakdown; polymer insulators; power cables; aged power cables; degradation mode; dielectric breakdown; droplets; polymer insulation; relaxation processes; spatial resolution; water tree; Aging; Cable insulation; Conductivity; Dielectrics and electrical insulation; Plastic insulation; Polymers; Power cables; Spatial resolution; Thermal degradation; Trees - insulation;
Conference_Titel :
Electrets, 2008. ISE-13. 13th International Symposium on
Conference_Location :
Tokyo
Print_ISBN :
978-1-4244-1850-3
Electronic_ISBN :
978-1-4244-1851-0
DOI :
10.1109/ISE.2008.4814022
