Abstract
IN two previous communications1–2 we have reported the results of conduction current measurements and space charge measurements in transformer oil using bare electrodes and electrodes coated with thin insulating films. The influence of such films on the breakdown strength of an oil gap is discussed in the present communication. The direct voltage breakdown strength of the oil has been measured using two bare electrodes, two coated electrodes, and one coated and one bare electrode. Plane-parallel electrodes with Bruce profiles and overall diameters of 1 cm were used. The insulating film on the electrodes consisted of a 0.25 mm thick coating of the polyether ‘Penton’. All the tests were carried out in a closed test cell using filtered air-saturated oil at atmospheric pressure3.
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