CRYOGENIC POWER TRANSMISSION TECHNOLOGY CRYOGENIC DIELECTRICS Quarterly Report July 1, 1975 - September 30, 1975

摘要

During the reporting period covering July 1 to September 30, 1975, dielectric strength measurements were carried out in liquid helium under both ac and dc field conditions, using point-to-plane electrode geometry. The effect of contamination on the dielectric strength of liquid helium was assessed by deliberately introducing dry nitrogen and atmospheric air into the helium dewar. No change in dielectric strength of any statistical significance was observed as a result of contamination.nIn order to correlate the results obtained using point-to-plane electrodes with those obtained under uniform field conditions, the electrical field enhancement factor with point-to-plane geometry was estimated through the use of a computer program.