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International Journal of Intelligent Systems and Applications(IJISA)

ISSN: 2074-904X (Print), ISSN: 2074-9058 (Online)

Published By: MECS Press

IJISA Vol.8, No.12, Dec. 2016

Characteristic Research of Single-Phase Grounding Fault in Small Current Grounding System based-on NHHT

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Author(s)

Yingwei Xiao

Index Terms

Transient component of zero-sequence current;fault phase;grounding resistance;NHHT;intrinsic mode function (IMF);EMD;Hilbert marginal spectrum

Abstract

Transient analysis is carried out for the single-phase grounding fault in small current grounding system, the transient grounding current expression is derived, and the influence factors are analyzed. Introduces a method for non-stationary and non-linear signal analysis method –Hilbert Huang transform (HHT) to analyze the single phase grounding fault in small current grounding system, HHT can be better used to extract the abundant transient time frequency information from the non-stationary and nonlinear fault current signals. The empirical mode decomposition (EMD) process and the normalized Hilbert Huang transform (NHHT) algorithm are presented, NHHT is used to analyze and verify an example of the nonlinear and non-stationary amplitude modulation signals. Build a small current grounding system in the EMTP_ATP environment, by selecting the appropriate time window to extract the transient signals, NHHT is used to analyze the transient current signals, and the Hilbert amplitude spectrum and the Hilbert marginal spectrum of the zero sequence transient current signals are obtained. Finally, the influences of the fault phase and the grounding resistance on the time-frequency characteristics of the signals are analyzed.

Cite This Paper

Yingwei Xiao,"Characteristic Research of Single-Phase Grounding Fault in Small Current Grounding System based-on NHHT", International Journal of Intelligent Systems and Applications(IJISA), Vol.8, No.12, pp.46-56, 2016. DOI: 10.5815/ijisa.2016.12.06

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