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000000260 001__ 260
000000260 037__ $$aENY-ARTICLE-2008-206
000000260 041__ $$aeng
000000260 088__ $$aI08/1989/I-044
000000260 100__ $$aWiszniewski, A$$uWroclaw University of Technology, Poland
000000260 245__ $$aDistance Digital Algorithm Immune to Saturation of Current Transformer
000000260 260__ $$c1989-04-01
000000260 300__ $$a6p
000000260 500__ $$aDevelopments in power system protection. Fourth International Conference, London, 11-13 April 1989. London : IEE, 1989. pp. 196-199
000000260 520__ $$aSaturation of current transformers due to slowly decaying primary current D.C. components cause errors in reproduction of the current fundamental harmonic. Most of the relays are more or less sensitive to the errors. If the saturation occures before the given relay operated. the operation may be delayed up to about 2 time constants of the D.C.component. In some, although rare cases, transient CT errors may cause unselective operation of the relay. Whether the current transformer saturates and when it occures depend mainly on the accuracy limit factor and on the residual flux in the transformer core. However bearing in mind the very high expected values of short circuit currents and the long D.C. time constants one may conclude, that the design of CT-s which never saturate would end in bulky and expensive units. Therefore most of the protective CT-s which are in service saturate during severe transients. It is a duty of protection engineers to design the relays in such a way, that the errors caused by the saturation neither cause maloperation, nor bring about excessive delay.
000000260 6531_ $$adistance protection
000000260 6531_ $$acurrent transformer
000000260 700__ $$aSzafran, J$$uWroclaw University of Technology, Poland
000000260 8560_ $$
000000260 8564_ $$u$$zAccess to Fulltext
000000260 909CO $$$$pglobal
000000260 980__ $$aARTICLE