Measuring interfacial tension of insulating liquids against water using the Du Noüy ring method according to ASTM D971
Resource type:
Application note
Format:
pdf
Date of creation:
6 January 2024
Library code:
13631
Monitoring the degradation of insulating oil at an early stage is integral for detecting incipient faults within a transformer and avoiding catastrophic failures. The interfacial tension (IFT) is commonly considered to be an effective index for evaluating deterioration with increasing age, due to its high sensitivity to contaminants and impurities.
The ASTM D971: "Standard Test Method for Interfacial Tension of Insulating Liquids Against Water by the Ring Method" is a widely used standard method to examine the quality of insulating oil. Here, the application of ASTM D971 is presented using a tensiometer of the DCAT series from DataPhysics Instruments.
