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Technical advances and reductions in cost of computer hardware and software have reached the point where personal computers can mimic the behavior of experts in assisting in both the performance of complex testing procedures, and in diagnosing the significance of the results. The computer program described here acts as an expert assisting in the performance and diagnosis of the results of discharge...
This paper describes measurements of the magnitude and distribution of residual fields around a tri-post insulator in compressed SF6, after being subjected to sustained dc voltages of several hundred kV, of negative and positive polarity. The effects of geometry associated with insulator leg fittings, particle-trap slots and residual dust were studied. Comparative measurements were also made on an...
A universal feature of practical importance in the breakdown of solids, liquids, gases and vacuum is the sensitivity or otherwise of these media to breakdown due to the effects of imperfections in the dielectric and electrode system. High local electric stresses adjacent to protrusions or edges of electrodes can lead to self-propagating failures in the insulating medium. This paper discusses the occurence...
A test method for evaluation of solid insulating material for insulators in Compressed Gas Insulated Transmission (CGIT) systems has been developed. The test measures the ability of an insulating surface to withstand voltage after being subjected to a high energy power arc across its surface. The test has been used to evaluate several different solid insulators in SF6 at 45 psig. The test circuit...
Previous work1 by the authors has shown that the breakdown time-lags for oil-filled trigatrons subjected to power frequency voltages can range from a small fraction of a cycle to several cycles of 60 Hz voltage. In general it was shown that long breakdown delays of one quarter to several cycles of power frequency voltage occurred with large amounts of available trigger energy (∼1 J) and low stresses...
In this paper we report some of the results obtained in a study of triggered breakdown in technical grade transformer oil. The gap studied consisted of two brass hemispheres of 12 cm diameter with the gap axis mounted horizontally in an oil tank. One of these electrodes was connected to a 60 Hz high voltage transformer, the other was permanently grounded and contained within it a 1.5 mm diameter tungsten...
The work covered in this paper forms a part of a general development program of resin rich and impregnated insulation for application in electrical machines described in another paper read at this Conference.1
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