The rearch about the single-phase ground fault location based on backward travelling wave in small current grounding system

Single-phase ground fault line selection problem has never been satisfactorily resolved in small current neutral grounding system in china. According to such a situation and combining theoretical analysis and simulation research with reports published in literature, existing faulty line selection technologies are generalized, and working principles, application conditions and existing defects of these technologies are analyzed, meanwhile the feasible improvement of these technologies and the up-to-date research achievements, and deficiencies of applications in this field are summarized. Finally, the development trend of faulty line selection technology for small-current neutral grounding system is pointed out.

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A Distribution Network Fault Location Method Based on Reverse Wave and Wavelet Analysis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.713-715.1369 ◽

2015 ◽

Vol 713-715 ◽

pp. 1369-1372

Author(s):

Xue Ming Zhai ◽

Huan Xia ◽

Long An

Keyword(s):

Generating Functions ◽

Fault Location ◽

Single Phase ◽

Travelling Waves ◽

Distribution Network ◽

Travelling Wave ◽

Location Method ◽

Ground Fault ◽

Modulus Maximum ◽

Network Fault

Based on the analysis of the transient process of the electric line’s developing ground fault, this paper applies the oppositely-directed travelling wave fault location method to fault location in distribution network. Simultaneously, this paper chooses proper wavelet generating functions to find the modulus maximum of oppositely-directed travelling waves and summarizes the methods and steps of this oppositely-directed travelling wave fault location. Finally, PSCAD/EMTDC is used to simulate the single-phase ground fault to verify the oppositely-directed travelling wave fault location method.

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Fault Line Selection Research on Single Phase Ground Fault of Small Current Grounding System Based on Wavelet Theory

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.513-517.3552 ◽

2014 ◽

Vol 513-517 ◽

pp. 3552-3555

Author(s):

Xiang Gao ◽

Lu Wang

Keyword(s):

Single Phase ◽

Selection Criterion ◽

Fault Line ◽

Wavelet Theory ◽

Small Current ◽

Grounding System ◽

Fault Line Selection ◽

Ground Fault ◽

Line Selection ◽

Wavelet Transform Modulus Maximum

For the problem of single-phase ground fault line selection of small current grounding system, in this paper, according to the wavelet theory advantage processing capabilities of transient mutation signal ,line selection criterion based on wavelet transform modulus maximum principle of singularity detection is proposed . By analyzing the single-phase ground fault waveform of small current grounding system in the neutral point not effective grounding system, steady state and transient characteristics of fault occurs is obtained, building bus with three outlets of 10KV small current grounding system simulation model by using MATLAB software, and verifying the validity though a large number of simulation experiments on the method.

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