Format: HTML | BibTeX | DC | EndNote | NLM | MARC | MARCXML
Published Article / ENY-ARTICLE-2008-202

Correction of Current Transformer Transient Performance

Wiszniewski, A (Institute of Electrical Power Engineering, Wroclaw University of Technology, Wroclaw, Poland) ; Rebizant, W (Institute of Electrical Power Engineering, Wroclaw University of Technology, Wroclaw, Poland) ; Schiel, L (Siemens AG, PTD EA, Berlin, Germany)

2007-01-05

Abstract: If 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.

Keyword(s): current-transformer (CT) saturation ; protective relaying ; signal reconstruction ; transient analysis
Note: IEEE Transactions on Power Delivery, Vol. 23, No. 2, April 2008, pp. 624-632


Fulltext : http://zet10.ipee.pwr.wroc.pl/record/256/files/

Cited by: try citation search for ENY-ARTICLE-2008-202

Record created 2008-11-08, last modified 2008-11-08

Ähnliche Datensätze


 
Benutzer, die diese Seite angeschaut haben, haben auch angeschaut:
(905)  Proceedings of the Int. Conference "7th EEEIC International Workshop on Environment and Electrical Engineering" - Schwarz, H et al - ENY-PREPRINT-2008-008
(888)  Impact of Distributed Generation on Electrical Power Network - Khan, U N - ENY-ARTICLE-2008-142
(887)  Adaptacyjne sieci neuronowe w zastosowaniu do identyfikacji stanu układów elektrycznych - Kostyla, P - ENY-THESIS-2008-005
(872)  Measurement of IEC Groups and Subgroups Using Advanced Spectrum Estimation Methods - Bracale, A et al - ENY-ARTICLE-2008-117
(869)  Evaluation of compensation devices of DC arc furnaces using advanced spectrum estimation methods - Bracale, A et al - ENY-ARTICLE-2008-011

 
Dieses Dokument bewerten:
Als Erster ein Review für dieses Dokument verfassen


Dokument diskutieren:
Diskussion über Dokument starten.