Assessing Transformer Condition Through Liquid Testing

This technical report outlines the process of assessing transformer condition using insulating liquid testing. It details how analyzing a transformer’s insulating liquid can reveal critical information about the asset's health, including signs of overheating, partial discharge, and contamination. The report emphasizes the importance of obtaining a high-quality liquid sample, as poor sampling can lead to inaccurate results. It discusses the methodology of dissolved gas analysis (DGA), which measures gases dissolved in the insulating liquid to identify emerging faults. The report also explains how to interpret DGA data, highlighting key gases and their implications for transformer health. Additionally, it addresses the significance of monitoring changes in the chemical and physical properties of the insulating liquid, particularly the impact of water on transformer performance. The report concludes with recommendations for maintaining accurate sampling and testing procedures to ensure effective transformer condition assessment.