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

fYear

1989

Firstpage

267

Lastpage

271

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Conduction and Breakdown in Solid Dielectrics, 1989., Proceedings of the 3rd International Conference on

Conference_Location

Trondheim

Type

conf

DOI

10.1109/ICSD.1989.69202

Filename

69202