Dielectric frequency response of oil-paper composite insulation with transient moisture distribution

Author

Jun Liu ; Lijun Zhou ; Yang Luo ; Xiaofeng Huang ; Guangning Wu

Author_Institution

Coll. of Electr. Eng., Southwest Jiaotong Univ., Chengdu, China

Volume

20

Issue

4

fYear

2013

fDate

Aug-13

Firstpage

1380

Lastpage

1387

Abstract

Because the temperature and load of transformer are variable, the moisture is usually inhomogeneous in oil-paper, especially for the traction transformer. In order to research the dielectric relaxation behavior of the oil-paper composite insulation with an inhomogeneous moisture distribution, it was proposed that a theoretical model for dielectric medium with an arbitrary distribution of conductivity and dielectric constant. The dielectric frequency response of oil-paper with transient moisture distribution was simulated by using the proposed model. The results show that transient moisture distribution caused the concentration polarization(CP), which enhanced the low-frequency relaxation. The model is validated against experimental data.

Keywords

insulating oils; permittivity; power transformer insulation; traction power supplies; arbitrary distribution; concentration polarization; dielectric constant; dielectric frequency response; dielectric medium; dielectric relaxation; low-frequency relaxation; oil-paper composite insulation; traction transformer; transient moisture distribution; Conductivity; Dielectrics; Moisture; Oil insulation; Permittivity; Power transformer insulation; Dielectric frequency response; complex permittivity; oil-paper composite insulation; transient moisture distribution;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2013.6571459

Filename

6571459