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9.3 Dielectric Fluid Sampling
Dielectricfluid samples should be taken at least on an annual basis and analyzed by DGA (Dissolved Gas
Analysis). RoutineDGAtestingisoneofthebestmethodsofdeterminingthe“Health”ofatransformer.
Althoughtheultimatefailureofatransformermaybeimpossibletopredict,routineoiltestingcanoften
indicate a detrimental internal condition before it destroys the unit.