Dynamic behavior of interconnected channels in water-treed polyethylene subjected to high voltage

Author

Nakamura, S. ; Ozaki, T. ; Ito, N. ; Sengoku, I. ; Kawai, J.

Author_Institution

Dept. of Electr. & Electron. Eng., Mie Univ., Tsu, Japan

Volume

9

Issue

3

fYear

2002

fDate

6/1/2002 12:00:00 AM

Firstpage

390

Lastpage

395

Abstract

While increasing a 500 Hz voltage from 300 V to 2000 V, the charging and ac loss currents of a water-treed XLPE are observed to increase more with voltage than those of a non-degraded XLPE. The fundamental and the third harmonic of the ac loss current have been numerically analyzed based on a model of water-treed insulation. In the model, a nonlinear voltage dependence of the conductance of a water-filled channel region is assumed. Magnitudes and phase angles of the fundamental and 3rd harmonic components of the ac loss current calculated from the model are compared with the observed ones. It was found that the length of water-filled channel region of a water tree grows with increasing voltage, and that this length approaches that of the water-treed region estimated by the pulsed electroacoustic (PEA) method

Keywords

XLPE insulation; trees (electrical); 300 to 2000 V; 500 Hz; AC loss current; XLPE insulation; charging current; conductance; fundamental component; high voltage stress; interconnected channel dynamics; pulsed electroacoustic method; third harmonic component; water-treed polyethylene; Dielectric losses; Dielectric measurements; Electric breakdown; Permittivity; Polyethylene; Power cables; Pulse measurements; Stress; Trees - insulation; Voltage;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2002.1007701

Filename

1007701