Space charge behavior under ac voltage in water-treed PE observed by the PEA method

Author

Li, Ying ; Kawai, Jiro ; Ebinuma, Yasumitsu ; Fujiwara, Yasutaka ; Ohki, Yoshimichi ; Tanaka, Yasuhiro ; Takada, Tatsuo

Author_Institution

Showa Electr. Wire & Cable Co. Ltd., Kawasaki, Japan

Volume

4

Issue

1

fYear

1997

fDate

2/1/1997 12:00:00 AM

Firstpage

52

Lastpage

57

Abstract

The pulsed electroacoustic method (PEA) has been applied to observe space charge formation under ac application (7 kV_pk, 50, 0.1 and 0.001 Hz) in water-treed polyethylene samples in order to understand the degradation mechanism of water trees. A system with phase-resolving capability has been developed to measure the space charge distribution at any phase angle of the applied ac voltage. By comparing the observed charge distributions with theoretically predicted ones, it has been shown that the interfacial polarization due to the difference in conductivity between the treed and the regions without trees dominate the space charge behavior. It has become clear that the PEA method can be a powerful nondestructive method for evaluating water tree length

Keywords

dielectric polarisation; electric breakdown; insulation testing; nondestructive testing; polyethylene insulation; space charge; trees (electrical); 0.001 Hz; 0.1 Hz; 50 Hz; 7 kV; PEA method; degradation mechanism; interfacial polarization; nondestructive method; phase-resolving capability; pulsed electroacoustic method; space charge behavior; space charge distribution; water-treed PE; Charge measurement; Current measurement; Degradation; Phase measurement; Polarization; Polyethylene; Pulsed electroacoustic methods; Space charge; Trees - insulation; Voltage;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.590866

Filename

590866