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000000256 001__ 256
000000256 037__ $$aENY-ARTICLE-2008-202
000000256 041__ $$aeng
000000256 100__ $$aWiszniewski, A$$uInstitute of Electrical Power Engineering, Wroclaw University of Technology, Wroclaw, Poland
000000256 245__ $$aCorrection of Current Transformer Transient Performance
000000256 260__ $$c2007-01-05
000000256 300__ $$a9p
000000256 500__ $$aIEEE Transactions on Power Delivery, Vol. 23, No. 2, April 2008, pp. 624-632
000000256 520__ $$aIf a current transformer (CT) saturates while transforming the heavy primary current, in each period, there are sections when the magnetic core is unsaturated and transformation is correct, and when it is saturated, it causes enormous errors. The key to correct the errors is to detect instants of saturation and moments when the saturation ends. This paper presents simple and efficient methods of doing that. In addition, it shows the way how to predict up to three samples after saturation with the acceptable degree of accuracy, thus artificially expanding the unsaturated section. It may substantially facilitate operation of protective devices. The ultimate solution of the problem is to estimate the values of the fundamental frequency component amplitude and the decaying dc component in each period. This paper presents the method of doing that on the ground of four consecutive samples taken during the unsaturated section. If the primary current consists of the fundamental and dc exponential components only, the accuracy of the method is excellent. Neglecting contamination of the current signal with harmonics and noise, it is possible to reconstruct the CT primary current based on the measured values of fundamental and dc components.
000000256 6531_ $$acurrent-transformer (CT) saturation
000000256 6531_ $$aprotective relaying
000000256 6531_ $$asignal reconstruction
000000256 6531_ $$atransient analysis
000000256 700__ $$aRebizant, W$$uInstitute of Electrical Power Engineering, Wroclaw University of Technology, Wroclaw, Poland
000000256 700__ $$aSchiel, L$$uSiemens AG, PTD EA, Berlin, Germany
000000256 8560_ $$fleon99@pwr.wroc.pl
000000256 8564_ $$uhttp://zet10.ipee.pwr.wroc.pl/record/256/files/$$zAccess to Fulltext
000000256 909CO $$ooai:zet10.pwr.wroc.pl:256$$pglobal
000000256 980__ $$aARTICLE