Experimental Study of Air Discharge Under Various Frequency Stress with Inhomogeneous Field
T. Luo (TU Delft - High Voltage Technology Group)
Mohamad Gaffarian Ghaffarian Niasar (TU Delft - High Voltage Technology Group)
P.T.M. Vaessen (TU Delft - High Voltage Technology Group)
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Abstract
In this paper, air discharges for different frequencies are tested in a point-plane geometry with different air gaps. The stress frequencies vary between 50 Hz to 5 kHz, and air gaps vary from 2.5mm to 10mm. It is observed that the partial discharge inception voltage of the positive corona increases with the increase of frequency, while the inception voltage of the negative corona stays nearly the same. The breakdown voltage increases with the increase of frequency in our test set, and breakdowns happen during negative half-cycle, especially at 5kHz, which is supposed to be caused by the space charges.