抄録
Relationships of the current-voltage (I-V) characteristic and the flow velocity U in transformer oil have been studied under DG stresses using needle- and blade-plane geometries. Linear plots of V vs. I1/n (n=2 for the needle and n=3 for the blade) and of U vs. I/V are obtained respectively whatever the polarity of the applied voltage. However, in the case of negative applied voltage, the slope of these linear plots in both geometries changes when V and I exceed their critical values. The change is explained by Kolmogoroff's turbulence theorem both with experimental distribution of flow velocities and with the observation of flow patterns.
