Charge distribution measurement on a truncated cone spacer under DC voltage

Author

Kumada, Akiko ; Okabe, Shigemitsu

Author_Institution

Dept. of Electr. Eng., Tokyo Univ., Japan

Volume

11

Issue

6

fYear

2004

Firstpage

929

Lastpage

938

Abstract

A system for measuring charge distribution on an insulating spacer is developed. An electrostatic probe is set close to the spacer, and it moves along its surface maintaining a small gap. The accumulated charge is inversely calculated from the measured data by utilizing the relationship that is obtained through the numerical electric field computation. Using this system, the surface charge distribution on a truncated cone spacer of 80 mm diameter and 15 mm height is measured. The number of measured points is 3402, and the spatial resolution is 3.9 mm. After the application of DC 10 kV for 19 hours, the spacer surface is charged with a spotted pattern. The charge density reaches 60 pC/mm² at its maximum. In addition, the residual charge distribution of partial discharge from metallic particles on the spacer is observed.

Keywords

Wiener filters; electrostatics; insulators; partial discharge measurement; probes; surface charging; 10 kV; 15 mm; 3.9 mm; 80 mm; DC voltage; Wiener filter; accumulated charge; charge density; electrostatic probe; insulating spacer; metallic particles; numerical electric field computation; partial discharge; residual charge distribution; spatial resolution; surface charge distribution measurement; truncated cone spacer; Charge measurement; Current measurement; Electric variables measurement; Electrostatic measurements; Insulation; Partial discharges; Probes; Spatial resolution; Surface discharges; Voltage;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2004.1387815

Filename

1387815