Space charge measurement in EVA film at cryogenic through room temperature region

Author

Nagao, M. ; Murakami, Y. ; Hozumi, N. ; Fukuma, M.

Author_Institution

Toyohashi Univ. of Technol., Japan

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

496

Lastpage

499

Abstract

Space charge effect on DC breakdown strength of ethylene vinyl-acetate copolymer (EVA) was studied in the region of cryogenic to ambient temperatures. The direct space charge measurement by pulsed electroacoustic method showed no space charge at 180K, however, significant amount of positive charge was seen at 290 K. This positive charge would enhance the cathode field and reduce the DC breakdown stress. The "peak ratio" was defined in order to assess the field enhancement at cathode. The "ratio" showed almost the same temperature dependence as the breakdown strength, suggesting that the relaxation and enhancement of the cathode field by space charges significantly effects the breakdown characteristics

Keywords

cryogenics; electric breakdown; organic insulating materials; polymer blends; power cable insulation; space charge; 180 K; 290 K; DC breakdown strength; DC breakdown stress; EVA film; ambient temperatures; cathode field; cryogenic temperature region; ethylene vinyl-acetate copolymer; field enhancement; positive charge; power cables; pulsed electroacoustic method; room temperature; space charge measurement; temperature dependence; Cathodes; Charge measurement; Cryogenics; Current measurement; Electric breakdown; Pulse measurements; Pulsed electroacoustic methods; Space charge; Stress measurement; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2001 Annual Report. Conference on

Print_ISBN

0-7803-7053-8

Type

conf

DOI

10.1109/CEIDP.2001.963589

Filename

963589