The transformer oil sampling procedure is where every oil result is won or lost. Open a valve, fill a bottle, and you hand the lab a snapshot of a sealed tank you’ll probably never open. Get the sampling wrong and it doesn’t matter how good the lab is — no analysis can rescue a bad sample. Everything below… Read More: Transformer Oil Sampling Procedure (IEC 60475) »
Transformer oil testing is the cheapest diagnostic port you have. You open a valve, fill a bottle, and get a readout of what is happening inside a sealed tank you will probably never open. But a number on a lab report means nothing on its own. 22 mg/kg of water is fine in a 33 kV distribution unit… Read More: Transformer Oil Testing: Tests, Limits and Actions »
You have two different windows into a transformer’s health. One is the DGA report — a lab analysis of gases dissolved in the insulating oil. The other is a PD test — a direct measurement of partial discharge activity in the windings. Both diagnose insulation problems. Neither alone tells the full story. When they agree, you have high… Read More: DGA and Partial Discharge: Correlating Dissolved Gas Analysis with PD… »