Abstract
IN 1955 we reported the observation of luminous spots on electrodes in transformer oil1. The spots were detected by a photographic plate in the oil between the electrodes with application of a.c. and d.c. voltage stresses for 2–30 min. The oil was usually degassed but not filtered. The luminous spots occurred at random on the surface of a plane electrode and were more concentrated at sharp edges. One of the electrode systems used was an American Society for Testing Materials oil-breakdown test-cup. The threshold average electric stress seemed to be of the order of 50 kV./cm. minimum. At the time of those experiments it was not known whether these luminous spots were due to discharges in tiny bubbles or to another cause.
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References
Dakin, T. W., and Berg, D., Conference Paper, Winter General Meeting, Amer. Inst. Elect. Eng. (Feb. 1955).
Darveniza, M., Nature, 183, 743 (1959).
Llewellyn-Jones, F., “Ionization and Breakdown in Gases”, 105 (John Wiley and Sons, Inc., New York, 1957).
Basseches, H., and McLean, D. A., Indust. Eng. Chem., 47, 1782 (1955).
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DAKIN, T., BERG, D. Luminous Spots on Electrodes in Insulating Oil Gaps. Nature 184, 120 (1959). https://doi.org/10.1038/184120a0
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DOI: https://doi.org/10.1038/184120a0
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