Research on Identifying Inrush Current of Transformer Based on Correlation Analysis

Abstract:

This paper presents correlation analysis to discriminate the magnetizing inrush current from the fault currents in transformers. The proposed technique is based on the normalized correlation coefficient flowing into transformers during the fault current or the transformer inrush current. The method need the imaginary parts of fundamental frequency components, which are obtained from sampling differential current based on full-wave fourier algorithm and half-wave fourier algorithm, then calculate the normalized correlation coefficient with theory of correlation coefficient. Theoretical analysis and dynamic simulation results show that the method is effective and reliable under various fault conditions and simple to be applied.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 6921-6926
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.6921
• Online since: January 2012
• Authors: Da Zhuang Chen, Jia Dong Huang
• Keywords: Full-Wave Fourier Algorithm, Half-Wave Fourier Algorithm, Magnetizing Inrush Current, Normalized Correlation Coefficient

References

[1] Wang Wei-jian. Eletric Equipment Relay Protection Theory and Application(Second Edition) [M]. Beijing: China Electric Power Press, 2002. pp.98-122.

[2] Wang Weijian, Consideration on the Improper Operation of Transformer Protection[J], Automation of Electric Power Systems, 2001, 21(10) , pp.1-3.

[3] Han Zhengqing, Gao Shibin, Li Qunzhan. New method to identify inrush current based on half-wave fourier analysis[J]. Automation of Electric Power Systems, 2005, 29(14),P. 60-63.

[4] Wang Zengping, Xu Yan, Wang Xue, et al. Study on the novel transformer protection principle based on the transformer model[J]. Proceedings of the CSEE, 2003, 23(12),P. 54-58.

[5] Huang Jiadong, Luo Weiqiang. New algorithm to identify inrush current based on improved mathematical morphology[J]. Proceedings of the CSEE, 2009, 29(7),P. 98-105.