Abstract
Electrical recovery characteristics of air gaps less than 3 mm are determined using a two-pulse method. The first pulse is used to feed an overvoltage value to the gap and initiate the arc current. The second pulse is used to determine the recovery voltage of the gap. A plot of the recovery voltage with time is obtained by varying the time delay of the second pulse relative to the arc extinction time, in the time range from 50 mu s to 100 ms. It is found that the recovery characteristics are independent of the electrode material (Cu, Al, or stainless steel) and the arc current in the range of 40 A to 200 A, but depend on the gap length and the electrode geometry. >
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