A methodology for determining water saturation limits and moisture equilibrium diagrams of alternative insulation systems

Author

Jovalekic, Mark ; Kolb, Daniel ; Tenbohlen, Stefan ; Bates, Lisa ; Szewczyk, Radoslaw

Author_Institution

Inst. of Power Transm. & High Voltage Technol. (IEH), Univ. of Stuttgart, Stuttgart, Germany

fYear

2011

fDate

26-30 June 2011

Firstpage

1

Lastpage

5

Abstract

In recent years one can observe a higher interest in alternative dielectric materials for power transformers. These are for example natural and synthetic esters or aramid fiber based solid insulation materials. In this paper moisture saturation curves of various insulation oils are presented up to a temperature of 140°C, together with the sorption isotherms of Nomex^® pressboard. These lead to adjusted equilibrium charts for moisture diagnosis of transformers with unconventional insulation systems.

Keywords

dielectric materials; insulating materials; insulating oils; moisture; power transformer insulation; alternative dielectric materials; alternative insulation systems; insulation oils; moisture equilibrium diagrams; moisture saturation curves; power transformers; solid insulation materials; water saturation limits; Humidity; Insulation; Moisture; Power transformers; Solids; Temperature measurement; Transformer oil; equilibrium charts; moisture; natural ester; sorption diagrams;

fLanguage

English

Publisher

ieee

Conference_Titel

Dielectric Liquids (ICDL), 2011 IEEE International Conference on

Conference_Location

Trondheim

ISSN

2153-3725

Print_ISBN

978-1-4244-7352-6

Electronic_ISBN

2153-3725

Type

conf

DOI

10.1109/ICDL.2011.6015472

Filename

6015472