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On the Requirements of Current Transformers in Differential Protection of Transformers at Electric Power Stations
The problem of picking protective current transformers (CT) in order to ensure proper functioning of differential protection in transient regimes is examined. It is proposed that the accuracy limit factor K lim referenced to the nominal current of a power transformer be used as the main parameter in choosing CT. Amethod is presented for calculating K lim as a function of the time to saturation t s, the decay time constant of the aperiodic component of short-circuit (SC) current, and the residual induction and current of external SC. It is shown that increasing K lim results in smaller CT errors in the time interval of the saturated state of a magnetic circuit. It is pointed out that the effect of screening must be taken into account in finding K lim for CT which do not have a proper primary winding and are arranged in phase with screened conductors.
On the Requirements of Current Transformers in Differential Protection of Transformers at Electric Power Stations
The problem of picking protective current transformers (CT) in order to ensure proper functioning of differential protection in transient regimes is examined. It is proposed that the accuracy limit factor K lim referenced to the nominal current of a power transformer be used as the main parameter in choosing CT. Amethod is presented for calculating K lim as a function of the time to saturation t s, the decay time constant of the aperiodic component of short-circuit (SC) current, and the residual induction and current of external SC. It is shown that increasing K lim results in smaller CT errors in the time interval of the saturated state of a magnetic circuit. It is pointed out that the effect of screening must be taken into account in finding K lim for CT which do not have a proper primary winding and are arranged in phase with screened conductors.
On the Requirements of Current Transformers in Differential Protection of Transformers at Electric Power Stations
Dmitrenko, A. M. (Autor:in) / Zhuravlev, D. P. (Autor:in)
Power Technology and Engineering ; 50 ; 662-667
01.03.2017
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
current transformer , core saturation , accuracy limit factor , resistance , secondary circuit , differential protection , residual induction , screening Engineering , Energy Technology , Power Electronics, Electrical Machines and Networks , Renewable and Green Energy , Geoengineering, Foundations, Hydraulics
| Engineering Index Backfile | 1963
Mathematical Models of Current Transformers in Algorithms of Differential Protection
| Online Contents | 2003
Mathematical Models of Current Transformers in Algorithms of Differential Protection
| Springer Verlag | 2003