Current Transformer Excitation Under Transit Conditions
- 1 October 1929
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Transactions of the American Institute of Electrical Engineers
- Vol. 48 (4) , 1464-1474
- https://doi.org/10.1109/T-AIEE.1929.5055433
Abstract
Tests of circuit breakers, relays, and similar devices in which current transformers have been used to step down the large currents involved to values measurable by the oscillograph, have shown peculiar errors in the records during the transient portion of the current wave. The purpose of this paper is to show that the abnormal excitation of the magnetic circuit of the current transformer required during transient conditions is the cause of these errors, and to point out how the errors may be minimized sufficiently to be negligible. Mathematical expressions are also derived to make it possible to predetermine the ability of a transformer to handle transients correctly and to guide in the design of transformers for this service.Keywords
This publication has 2 references indexed in Scilit:
- Abridgment of short-circuit testing on Alabama power company system: Its procedure and effects on operationJournal of the A.I.E.E., 1929
- Tests on High-and Low-Voltage Oil Circuit BreakersTransactions of the American Institute of Electrical Engineers, 1927