Diagnosis for oil-immersed insulation using partial discharge due to bubbles in oil

Author

Shiota, H. ; Muto, H. ; Fujii, H. ; Hosokawa, N.

Author_Institution

Adv. Technol. Res. & Dept. Center, Mitsubishi Electr. corp., Hyogo, Japan

Volume

3

fYear

2003

fDate

1-5 June 2003

Firstpage

1120

Abstract

This paper deals with the partial discharge (PD) phenomenon and its use in the detection of small bubbles in oil and application to insulation diagnosis for oil-immersed power transformers. Bubbles in the oil strongly affect the reliability of insulation of oil-immersed power transformers as well as foreign particles. As the first step of the diagnosis of discharges in oil-immersed transformers, we conducted experiments to study the PD phenomena by measuring the PD characteristics and by observing the behavior of bubbles in oil. The experimental results, show that the Φ-q patterns strongly depends on the size of bubble.

Keywords

bubbles; partial discharge measurement; power transformer insulation; power transformers; reliability; transformer oil; Φ-q pattern; bubble size; foreign particle; oil; oil immersed insulation diagnosis; oil-immersed power transformer; partial discharge; reliability; Dielectrics and electrical insulation; Electric fields; Ellipsoids; Oil insulation; Partial discharges; Petroleum; Propulsion; Shape; Stress; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on

ISSN

1081-7735

Print_ISBN

0-7803-7725-7

Type

conf

DOI

10.1109/ICPADM.2003.1218620

Filename

1218620