The short-circuit impedance (%Z) of power transformers is sometimes measured on site and it can be compared to the nameplate of factory test values. It is used to detect winding movement that may have occurred since the factory tests were performed.
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Article filed in 'Tests Conducted On Power/Main Transformers'
The (Transformer) Short-Circuit Impedance Test
Filed in (Transformer) Dissolve Gas Analysis (DGA) Testing
Since everything inside a power transformer is emerge in oil, which serves as its insulation and cooling medium, every activities or incidents inside the transformer tank leaves a signature or traces in the oil.
(Transformer) Oil Chemical Tests
Oil in Power or Main Transformers serves as a cooling medium and insulation for the windings. The main purpose of the oil chemical tests is to determine and monitor the chemical properties of oil, which is very essential for its purpose, since failure in such chemical properties could be disastrous for the transformer itself.