Carr & Duff, Inc. performs Dissolved Gas in Oil analysis (DGA), screen tests, water content and can test for PCB content. A DGA analyzes the type and quantity of gas dissolved in the transformer oil.
The principal gases that are typically found are hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, methane, ethylene, ethane and acetylene. Certain quantities and combination of these gases are indicative of: insulation overheating and overloading, liquid overheating, partial discharge (corona), or arcing in the transformer. A transformer’s oil fluid serves as a heat transfer medium and it is also a part of the transformer’s insulation system. PCB tests are for older transformers to ensure compliance with EPA regulations.