Moisture solubility for differently conditioned transformer oils

Author

Du, Y. ; Mamishev, A.V. ; Lesieutre, B.C. ; Zahn, M. ; Kang, S.H.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA

Volume

8

Issue

5

fYear

2001

fDate

10/1/2001 12:00:00 AM

Firstpage

805

Lastpage

811

Abstract

It is important to monitor the moisture content of transformer oil in a transformer. One parameter of particular interest is the moisture solubility of transformer oil. It has been reported that transformer oils under different conditions have different solubility. Measurements of solubility for four different types of conditioned oil are presented in this paper: fresh Shell Diala AX oil, lab-aged Shell Diala A oil, Texas Utility used transformer oil, and Ramapo Substation used transformer oil. To avoid the difficulty of achieving full saturation, this paper proposes an alternative method of measuring the moisture solubility in transformer oil using a relative humidity sensor. It utilizes the linearity between the relative humidity of the oil and the moisture content of the oil, to measure the solubility indirectly. The measured results of fresh oil, lab-aged oil, and the Texas Utility oil are very close, and only Ramapo oil shows different sensor response characteristics and solubility

Keywords

humidity sensors; moisture measurement; solubility; transformer oil; Ramapo Substation oil; Shell Diala AX oil; Texas Utility oil; conditioned oil; fresh oil; lab-aged oil; moisture solubility; relative humidity sensor; transformer oil; used oil; Circuit faults; Dielectric liquids; Dielectric measurements; Humidity measurement; Moisture measurement; Oil insulation; Petroleum; Power transformer insulation; Refining; Sensor phenomena and characterization;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.959706

Filename

959706