Title :
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
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;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on
Print_ISBN :
0-7803-7725-7
DOI :
10.1109/ICPADM.2003.1218620
