Abstract :
IN THE FALL of 1946, a working group was appointed to study present-day sensitive ground protection of 3-phase systems and to prepare a report on this subject. It was realized that the Project Committee would not be able to find new solutions to some of the problems, but it was believed that it would be helpful to summarize present-day practices and to give an indication where developments and improvements are necessary or desirable. A number of papers which concern certain phases of sensitive ground protection have been published during the last ten years which describe in detail some of the fine points not repeated in this report.
