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The Discrimination of Inrush Current from Internal Fault of Power Transformer based on EMD
School of Electric Power, South China University of Technology,Guangzhou, China
School of Electric Power, South China University of Technology,Guangzhou, China
School of Electric Power, South China University of Technology,Guangzhou, China
- 1 School of Electric Power, South China University of Technology,Guangzhou, China
- 2 School of Electric Power, South China University of Technology,Guangzhou, China
- 3 School of Electric Power, South China University of Technology,Guangzhou, China
Energy and Power Engineering·Volume 05 (2013)·Pages 1425–1428·Published 30 June 2013·DOI10.4236/epe.2013.54B270
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Abstract
The method is based on that the waveform of the inrush distorts seriously, while the fault current nearly keeps sinusoid. The complicated signal can be decomposed into a finite intrinsic mode functions ( IMF ) by the EMD, then define and compute the projection area on X-axis of each IMF— , the specific gravity of SIMF— , and the maximum of — . We can get a new scheme of transformer-protection based on comparing the difference between inrush and fault current. Theoretical analysis show that the method can precisely discriminate inrush and fault current, fault clearance time is about 20ms. Moreover, it is convenient to achieve and hardly be affect by not-periodic component.
KeywordsInrush CurrentTransformer ProtectionHHTEMDIMF
- T. Y. Li, Y. Zhao and N. Li, “A New Method for Power Quality Detection Based on HHT,” Proceedings of the Csee, Vol. 25, No. 17, 2005, pp. 52-56
- Z. Ke, J. Jie and T. Q. Zhang, “Distinguishing Magnetizing Inrush Based on Characteristic of Equivalent Instantaneous Inductance,” Power System Protection and Control, 2010, pp. 12-16
- P. Liu, O. P. Malik, D. S. Chen, G. S. Hope and Y. Guo, “Improved Operation of Differential Protection of Power Transformers for Intemal Faults,” IEEE Transactions on Power Delivery, Vo1. 7,1992.
- S. H. Jiao, W. S. Liu, J. F. Liu, Z. H. Zhang and Q. X. Yang, “A New Principle of Discrimination between Inrrush Current and Fault Current of Transformer Based on Wavelet,” Proceedings of the CSEE, Jul. 1999, pp. 1-5.
- J. A. Sykes and L. F. Morrison, “A Proposed Method of Harmonic Restraint Differential Protection of Transformers by Digital Computer,” IEEE Transactions on Power Apparatus and Systems, Vol. PAS-91, pp. 1266-1273. doi:10.1109/TPAS.1972.293485
- F. M. Cao and P. P. Su, “The Application of Wavelet transform in Transformer’s Differential Protection,” Electric Power, Vol. 31, No. 11, 1998, pp. 21-24.