Posts By: wp1

In this article, Drs. Draper and Dukarm discuss three case histories that illustrate the usefulness of recent innovations in transformer DGA, especially when there is gas loss.

Moisture assessment is a complex topic for when it comes to high-voltage transformers. It’s difficult to interpret the water content of oil or paper insulation by looking at individual dissolved water measurements or time-series data, and increases in water solubility due to aging of oil make it risky to rely on relative saturation calculated from… Continue reading →

Normalized energy intensity (NEI), a fault energy index based on the standard heats of formation of fault gases, provides a useful way to look at fault severity. Check out this short article by Dr. Zachary Draper and Dr. Jim Dukarm from Electricity Today Magazine on how NEI can be used to assess and track faults… Continue reading →

Gas loss within a transformer can hide serious problems for dissolved gas analysis results. Check out this short article by Dr. Zachary Draper and Dr. Jim Dukarm from the High Voltage Electrical Testing special edition of Electricity Today Magazine on how gas loss can be taken into consideration in dissolved gas analysis interpretation to improve… Continue reading →

Join Dr. Jim Dukarm as he describes how physical chemistry and advanced statistics are breathing new life into transformer DGA. This article describes important advances like the use of fault energy indices and reliability statistics, and also provides an example that shows how these advances can improve fault detection and provide new risk assessment information.