Abstract :
George Keinath (consulting engineer, Larch-mont, N. Y.): I am very pleased to see that the General Electric Company is recommending the same procedure for testing high-voltage equipment as I did when I presented a paper on the same subject at the winter convention of the AIEE in January 1939. My experiments in this line started seven years ago, after some very bad experience with voltage transformers, which showed that the passing of the ordinary one-minute test is in no way an assurance of good performance in the field. First I used a photographic recorder for the active component of the capacity current, a vibrating mechanical rectifier, and a d-c galvanometer. The diagrams gave the active component first in function of the increasing voltage, during the proper test in function of time. A number of such diagrams have been published,1 but the recorder was too delicate for routine testing and so I decided to build an ink recorder.
