Isothermal microcalorimetry as a tool for studying oxidation stability of insulating liquids

Author

Tronstad, Ingvild ; Blekkan, Edd A. ; Ese, Marit-Helen G.

Author_Institution

Dept. of Chem. Eng., Norwegian Univ. of Sci. & Technol. (NTNU), Trondheim, Norway

Volume

19

Issue

5

fYear

2012

fDate

10/1/2012 12:00:00 AM

Firstpage

1528

Lastpage

1536

Abstract

The application of an isothermal microcalorimeter for the investigation of the oxidation stability of insulating liquids has been studied. We propose that the total integral heat signal (area below the calorimeter curves) is a good indicator of the degree of oxidation taking place in the sample during the experiment. Known and unknown insulating liquids have been used in this study, and the amount of available oxygen in the samples has been varied. The results show that isothermal microcalorimetry is well suited for characterizing the oxidation stability of insulating liquids.

Keywords

calorimeters; oxidation; power transformer insulation; stability; transformer oil; insulating liquid; isothermal microcalorimetry tool; oxidation stability; total integral heat signal; transformer; Dielectric liquids; Heating; Isothermal processes; Oxidation; Stability analysis; Temperature measurement; Thermal stability; Dielectric liquids; calorimetry; oxidation stability; power transformers;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2012.6311497

Filename

6311497