Space charge characteristics of multi-layer oil-paper insulation under different DC voltages

Author

Tang, Chao ; Chen, G. ; Fu, M. ; Liao, Ruijin

Author_Institution

State Key Lab. of Power Transm. Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China

fYear

2009

fDate

19-23 July 2009

Firstpage

914

Lastpage

917

Abstract

In this paper, space charge in oil-paper insulation system has been investigated using the pulsed electroacoustic (PEA) technique. A series of measurements were carried out when the insulation system was subjected to different applied voltages. Charge dynamics in the insulation system during the volts-on, volts-off and decay have been analyzed. It has been found that homocharge injection occurred both at the anode and the cathode. Positive charges are observed to accumulate in the layers, which indicate that the oil-paper layer interfaces act as a barrier for positive charges. The decay tests showed that after 30 min, about a quarter of space charges remained in the sample, about 90% charges disappeared after 2 hours. Finally, total charge variation in these tests were analyzed.

Keywords

paper; pulsed electroacoustic methods; space charge; DC voltages; anode; cathode; homocharge injection; multilayer oil-paper insulation; oil-paper insulation system; pulsed electroacoustic technique; space charge characteristics; Charge carrier processes; Charge measurement; Current measurement; Dielectrics and electrical insulation; Oil insulation; Petroleum; Power transformer insulation; Space charge; Testing; Voltage; DC Voltage; Multi-layer; Oil-paper; Space Charge;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 2009. ICPADM 2009. IEEE 9th International Conference on the

Conference_Location

Harbin

Print_ISBN

978-1-4244-4367-3

Electronic_ISBN

978-1-4244-4368-0

Type

conf

DOI

10.1109/ICPADM.2009.5252245

Filename

5252245