Dynamic observation on surface charge migration of polybutylene terephthalate under DC voltage

Author

Du, B.X. ; Gao, Yu ; Zhang, Lei

Author_Institution

Sch. of Electr. Eng. & Autom., Tianjin Univ., Tianjin

fYear

2008

fDate

7-11 Sept. 2008

Firstpage

404

Lastpage

407

Abstract

Polybutylene terephthalate(PBT) was employed as test sample to investigate the characteristics of surface charge migration. The experiment was carried out on sample surface under a negative dc stress between two parallel electrodes. An electrostatic probe was designed to measure the surface charge density with minimum charge resolution of 0.018 pC. Obtained results show that negative charges appear near high voltage electrode, while positive charges emerge in front of grounded electrode. The hetero charges migrate towards the opposite electrode with time, forming a junction line near the grounded electrode. The polarity of surface charge tends to be positive dominated with the lapse of decay time. It is suggested that the local field at HV electrode will be seriously enhanced if the source is turned on again.

Keywords

dielectric materials; electrodes; electrostatics; polymer insulators; surface charging; DC voltage; electrodes; electrostatic probe; polybutylene terephthalate; surface charge density; surface charge migration; surface charge polarity; Charge measurement; Current measurement; Density measurement; Dielectrics and electrical insulation; Electrodes; Electrostatics; Probes; Surface charging; Testing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials, 2008. (ISEIM 2008). International Symposium on

Conference_Location

Mie

Print_ISBN

978-4-88686-005-7

Electronic_ISBN

978-4-88686-006-4

Type

conf

DOI

10.1109/ISEIM.2008.4664599

Filename

4664599