An ultrasonic evaluation for degradation of insulating oil using fuzzy inference

Author

Nagamune, Kouki ; Kobashi, Syoji ; Kondo, Katsuya ; Hata, Yutaka ; Taniguchi, Kazuhiko

Author_Institution

Graduate Sch. of Himeji Inst. of Technol., Hyogo, Japan

Volume

1

fYear

2003

fDate

5-8 Oct. 2003

Firstpage

893

Abstract

Periodic inspection for degradation of insulating oil in transformers requires for preventing outage. However, conventional methods were not suitable for that, due to a large size of the measurement system and requirement of sampling. This study aims to develop the ultrasonic evaluation system satisfying these requirements aided by fuzzy inference. The system evaluates degradation, and it estimates kinetic viscosity. In the experiment, we applied our method into six kinds of insulating oils. As a result, correlation coefficient between our estimation and viscometer were over 0.92. Thus, our method correctly determines degradation of insulating oil.

Keywords

fuzzy logic; power transformers; transformer oil; ultrasonic applications; ultrasonic propagation; viscosity; correlation coefficient; fuzzy inference; insulating oil; kinetic viscosity estimation; periodic inspection; sampling; transformers; ultrasonic evaluation system; viscometer; Degradation; Fuzzy systems; Inspection; Kinetic theory; Oil insulation; Petroleum; Power transformer insulation; Sampling methods; Size measurement; Ultrasonic variables measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics, 2003 IEEE Symposium on

Print_ISBN

0-7803-7922-5

Type

conf

DOI

10.1109/ULTSYM.2003.1293543

Filename

1293543