NDLI: A New Method to Identify Inrush Current Based on HHT

Content Provider	IEEE Xplore Digital Library
Author	Weihua Xiong Guangzhou Zhao
Copyright Year	2006
Description	Author affiliation: ZheJiang SCI-TECH Univ., Hangzhou (Weihua Xiong)
Abstract	Wrong operation of transformer protection is always caused by magnetizing inrush currents. For safe running of a transformer, it is necessary to discriminate between magnetizing inrush currents and internal faults. Because the inrush current is a peaked wave with nonstationary component, the internal fault current can be distinguished from inrush current by the energy characteristics with time and frequency. A new method based on Hilbert-Huang transformation (HHT) was developed. Firstly, empirical mode decomposition (EMD) separated the electric current series to components with different time scale, say, intrinsic mode function (IMF). Secondly, Hilbert transform was applied to every IMF. Then, three dimensional amplitude (energy)-frequency-time spectrum designated as Hilbert spectrum was got, where both amplitude and frequency were functions of time. The Hilbert spectrum provided high-resolution time-frequency characteristics of transformer's different work states. The results show energy characteristics of current series. It is demonstrated by actual analysis that the new discriminating method is one effective way for power transformer protection
Starting Page	7480
Ending Page	7483
File Size	229459
Page Count	4
File Format	PDF
ISBN	1424403324
DOI	10.1109/WCICA.2006.1713419
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-21
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Surge protection Power transformers Magnetic separation Fault currents Time frequency analysis Intelligent control Automation MATLAB Power system control Power systems Internal fault HHT Transformer Inrush current
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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