Title :
Diagnosis of oxidation in XLPE cable by tan δ characteristics
Author :
Shimizu, N. ; Hirano, N. ; Horii, K.
Author_Institution :
Dept. of Electr. Eng., Nagoya Univ., Japan
Abstract :
The authors investigated the relationship between the density of oxidation products and the temperature dependence of tan δ in LDPE (low-density polyethylene) films. From a comparison of the temperature dependence of tan δ of PE in XLPE (cross-linked PE) cable with that of tan δ in PE film samples, it was found that tan δ gives accurate information about the oxidation in the insulating layer of the cable. The temperature dependence of tan δ in the oxidized PE film has a peak around 0°C, which is caused by the motion of the polar group. After oxidation has begun, tan δ increases to above 40°C. This is attributed to the motion of a small section produced by chain scission. The increase of tan δ as a function of the density of oxidation products is obtained
Keywords :
cable insulation; insulation testing; loss angle; organic insulating materials; oxidation; polymers; power cables; 0 degC; 40 degC; XLPE cable; cable diagnosis; chain scission; cross-linked PE; insulating layer; low-density polyethylene; oxidation products; tan δ characteristics; temperature dependence; Cable insulation; Contacts; Extrapolation; Frequency dependence; Frequency measurement; Least squares methods; Oxidation; Paints; Temperature dependence; Temperature measurement;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1989., Proceedings of the 3rd International Conference on
Conference_Location :
Trondheim
DOI :
10.1109/ICSD.1989.69202
