Regular inspection of the transformer oil quality is important to ensure the operation of the transformer. Several methods are available, but the newly released IEC 62691 standard is based on the interfacial tension measurement between water and the transformer oil.
Automation ensures the ease of use
Although interfacial tension between water and oil can be measured with any tensiometer, Sigma 702 ET enable automated operation. This ensures that the measurement is easy to conduct and performed, in the same way, each time independent of the instrument operator.
Sigma 702 ET has instruction for both ASTM D971 and IEC 62961 embedded into its software which makes it simple to conduct the measurements. The software will guide you through each step of the measurement independent on which standard you decide to follow.
To learn more about the testing of the transformer oil quality and see how it can be done in practice, please watch the short video below.
The new standard IEC 62961 for the transformer oil quality testing has just been released. In this blog post, the main differences between the old ASTM D971 and the new IEC 62961 standard are discussed.
Interfacial tension of insulating liquids against water has been used for a long time as a criterion for aging evaluation. The latest revision for the ASTM D971 standard dates back to 2012. The new IEC standard is about the be released to improve the accuracy of the method.