Electric field control in coaxial disk-type solid insulator by functionally graded materials (FGM)

Author

Ishiguro, J. ; Kurimoto, M. ; Kojima, H. ; Kato, Kazuhiko ; Okubo, Hisanori ; Hayakawa, Naoki

Author_Institution

Nagoya Univ., Nagoya, Japan

fYear

2014

fDate

19-22 Oct. 2014

Firstpage

663

Lastpage

666

Abstract

We have been investigating functionally graded materials (FGM) with the purpose of controlling and relaxing electric field in solid insulator of electric power apparatus. FGM is characterized by the spatial distribution of dielectric permittivity in a solid insulator, and can control the surrounding electric field distribution in power apparatus such as gas insulated switchgears (GIS) and epoxy mold transformers. In this paper, we fabricated a coaxial disk-type GLP (grading to lower permittivity)-FGM for the GIS spacer. Experimental results revealed that we could fabricate GLP-FGM with relative permittivity distribution from 8.2 to 5.3 in the coaxial disk-type spacer. According to the numerical analysis, the maximum electric field at the HV-electrode/spacer interface was reduced by 12 % for the coaxial disk-type GLP-FGM than that of the conventional spacer with uniform permittivity.

Keywords

discs (structures); electric fields; electrodes; functionally graded materials; gas insulated switchgear; insulators; numerical analysis; permittivity; power apparatus; power control; power transformers; GIS spacer; HV-electrode-spacer interface; coaxial disk-type GLP-FGM; coaxial disk-type solid insulator; electric field distribution control; electric power apparatus; epoxy mold transformers; functionally graded materials; gas insulated switchgears; grading to lower permittivity; numerical analysis; relative dielectric permittivity distribution; spatial distribution; uniform permittivity; Electric fields; Force; Gas insulation; Insulators; Permittivity; Solids;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena (CEIDP), 2014 IEEE Conference on

Conference_Location

Des Moines, IA

Type

conf

DOI

10.1109/CEIDP.2014.6995799

Filename

6995799