Title :
Electrical tree at high temperature in XLPE and effect of oxygen
Author :
Shimizu, N. ; Shibata, Y. ; Ito, K. ; Imai, K. ; Nawata, M.
Author_Institution :
Dept. of Electr. & Electron. Eng., Meijo Univ., Nagoya, Japan
Abstract :
Effect of degassing treatment on tree initiation voltage was investigated in XLPE specimen with semiconducting electrode at 50°C and room temperature. 1. Degassing treatment drastically increases tree initiation voltage of XLPE at room temperature. The same result is obtained in LDPE. 2. However, degassing treatment does not so much increase tree initiation voltage of XLPE at 50°C, regardless of degassing temperature. This result is different from the result in LDPE, where tree initiation voltage at elevated temperature is increased by degassing treatment at elevated temperature. 3. It is considered that oxygen deeply trapped in or chemically bonded to XLPE polymer structure is released by combination of electric field and thermal stimulation, and participates in tree initiation process
Keywords :
XLPE insulation; insulation testing; power cable insulation; trees (electrical); 20 degC; 50 degC; O2; XLPE; degassing treatment; electric field; electrical tree; elevated temperature; semiconducting electrode; thermal stimulation; tree initiation voltage; Cable insulation; Electrodes; Oxygen; Petroleum; Polymers; Power cables; Semiconductivity; Temperature; Trees - insulation; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2000 Annual Report Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-6413-9
DOI :
10.1109/CEIDP.2000.885293
