Publisher's Synopsis
Excerpt from Limitations of the Series Transformer in Transient Phenomena: Thesis
The following work is the outgrowth of a series of tests and calculations, made on the short circuit currents of alternators. A number of oscillograph records were taken of the short circuit current and the instantaneous values compared with those calculated from the constants of the alternator. The agreement was close in tests made in the laboratory, where the oscillograph was direct connected to the system; but very considerable discrepancies were found in some tests made outside of the laboratory, where the oscillograph was connected in the secondary circuit of a series transformer. Since the theory of the short circumzcurrents of alternators would not explain the peouliaraties in the latter curves a study of the action' of series transformers on unsymetrical or transient currents, was undertaken in an attempt to explain the phenomena. The results of this investigation shows that the series transformer(especially with iron core) is unreliable for recording transient or unsymetrical currents. While these is really only one type of current transformer in practical use, which type has an iron magnetic circuit it is of interest.
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