Fault Line Selection Algorithm Based on Correlation Analysis of Transient Information of Fault Signal in Neutral Un-effectual Grounded System

doi:10.11930/j.issn.10.11930.2015.1.81

journal1 ›› 2015, Vol. 48 ›› Issue (1): 81-86.DOI: 10.11930/j.issn.10.11930.2015.1.81

• Power System • Previous Articles Next Articles

Fault Line Selection Algorithm Based on Correlation Analysis of Transient Information of Fault Signal in Neutral Un-effectual Grounded System

DAI Xusheng¹, HUANG Chun¹, YE Qian², WANG Feng¹, DONG Xuzhu³, LENG Chongfu¹

1. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;
2. Chongzuo Power Supply Bureau, Guangxi Grid Company, Chongzuo 532200, China;
3. Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China

Received:2014-10-29 Online:2015-11-24 Published:2015-11-25
Supported by:
The National High Technology Research and Development of China (863 Program) (No. 2011AA05A114).

Abstract

Abstract: In case of single-phase grounding fault in small current neutral grounding system, the transient ground fault current contains the information of the whole system’s fault characteristics. The main component of transient phase current of health line is capacitive current to ground. Considering the effect of inductance in the system, the differential current of health feeder is very small and the phase current waveform and zero sequence transient current are significantly irrelevant. Meanwhile the waveform of the fault line and differential current show a significant correlation. Taking the advantage of the feature of small current system in case of signal-phase fault, the fault phase can be detected by the approximation ratio of three phase bus voltage. Then the fault line can be diagnosed by using the correlation analysis and comparison of each line’s transient differential current and zero sequence current correlation. The simulation in MATLAB/SIMULINK is carried out to verify the feasibility of the proposed method.

Key words: small current grounding system, fault line selection, wavelet transform, zero sequence current, correlation analysis

CLC Number:

TM771

DAI Xusheng, HUANG Chun, YE Qian, WANG Feng, DONG Xuzhu, LENG Chongfu. Fault Line Selection Algorithm Based on Correlation Analysis of Transient Information of Fault Signal in Neutral Un-effectual Grounded System[J]. journal1, 2015, 48(1): 81-86.

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Fault Line Selection Algorithm Based on Correlation Analysis of Transient Information of Fault Signal in Neutral Un-effectual Grounded System

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